3962 lines
148 KiB
C++
3962 lines
148 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "gfxFont.h"
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#include "gfxFont-Impl.h"
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#include "mozilla/BinarySearch.h"
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#include "mozilla/DebugOnly.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/MathAlgorithms.h"
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#include "mozilla/SVGContextPaint.h"
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#include "mozilla/Logging.h"
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#include "nsITimer.h"
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#include "gfxGlyphExtents.h"
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#include "gfxPlatform.h"
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#include "gfxTextRun.h"
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#include "nsGkAtoms.h"
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#include "gfxTypes.h"
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#include "gfxContext.h"
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#include "gfxFontMissingGlyphs.h"
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#include "gfxGraphiteShaper.h"
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#include "gfxHarfBuzzShaper.h"
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#include "gfxUserFontSet.h"
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#include "nsIUGenCategory.h"
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#include "nsSpecialCasingData.h"
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#include "nsTextRunTransformations.h"
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#include "nsUnicodeProperties.h"
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#include "nsStyleConsts.h"
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#include "mozilla/AppUnits.h"
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#include "mozilla/Likely.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/Services.h"
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#include "gfxMathTable.h"
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#include "gfxSVGGlyphs.h"
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#include "gfx2DGlue.h"
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#include "GreekCasing.h"
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#include "cairo.h"
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#ifdef XP_WIN
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#include "cairo-win32.h"
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#include "gfxWindowsPlatform.h"
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#endif
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#include "harfbuzz/hb.h"
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#include "harfbuzz/hb-ot.h"
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#include "graphite2/Font.h"
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#include <algorithm>
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#include <limits>
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#include <cmath>
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using namespace mozilla;
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using namespace mozilla::gfx;
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using namespace mozilla::unicode;
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using mozilla::services::GetObserverService;
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gfxFontCache *gfxFontCache::gGlobalCache = nullptr;
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#ifdef DEBUG_roc
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#define DEBUG_TEXT_RUN_STORAGE_METRICS
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#endif
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#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
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uint32_t gTextRunStorageHighWaterMark = 0;
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uint32_t gTextRunStorage = 0;
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uint32_t gFontCount = 0;
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uint32_t gGlyphExtentsCount = 0;
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uint32_t gGlyphExtentsWidthsTotalSize = 0;
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uint32_t gGlyphExtentsSetupEagerSimple = 0;
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uint32_t gGlyphExtentsSetupEagerTight = 0;
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uint32_t gGlyphExtentsSetupLazyTight = 0;
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uint32_t gGlyphExtentsSetupFallBackToTight = 0;
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#endif
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#define LOG_FONTINIT(args) MOZ_LOG(gfxPlatform::GetLog(eGfxLog_fontinit), \
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LogLevel::Debug, args)
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#define LOG_FONTINIT_ENABLED() MOZ_LOG_TEST( \
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gfxPlatform::GetLog(eGfxLog_fontinit), \
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LogLevel::Debug)
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/*
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* gfxFontCache - global cache of gfxFont instances.
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* Expires unused fonts after a short interval;
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* notifies fonts to age their cached shaped-word records;
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* observes memory-pressure notification and tells fonts to clear their
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* shaped-word caches to free up memory.
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*/
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MOZ_DEFINE_MALLOC_SIZE_OF(FontCacheMallocSizeOf)
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NS_IMPL_ISUPPORTS(gfxFontCache::MemoryReporter, nsIMemoryReporter)
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NS_IMETHODIMP
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gfxFontCache::MemoryReporter::CollectReports(
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nsIHandleReportCallback* aHandleReport, nsISupports* aData, bool aAnonymize)
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{
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FontCacheSizes sizes;
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gfxFontCache::GetCache()->AddSizeOfIncludingThis(&FontCacheMallocSizeOf,
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&sizes);
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MOZ_COLLECT_REPORT(
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"explicit/gfx/font-cache", KIND_HEAP, UNITS_BYTES,
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sizes.mFontInstances,
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"Memory used for active font instances.");
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MOZ_COLLECT_REPORT(
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"explicit/gfx/font-shaped-words", KIND_HEAP, UNITS_BYTES,
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sizes.mShapedWords,
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"Memory used to cache shaped glyph data.");
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return NS_OK;
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}
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NS_IMPL_ISUPPORTS(gfxFontCache::Observer, nsIObserver)
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NS_IMETHODIMP
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gfxFontCache::Observer::Observe(nsISupports *aSubject,
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const char *aTopic,
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const char16_t *someData)
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{
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if (!nsCRT::strcmp(aTopic, "memory-pressure")) {
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gfxFontCache *fontCache = gfxFontCache::GetCache();
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if (fontCache) {
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fontCache->FlushShapedWordCaches();
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}
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} else {
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NS_NOTREACHED("unexpected notification topic");
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}
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return NS_OK;
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}
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nsresult
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gfxFontCache::Init()
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{
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NS_ASSERTION(!gGlobalCache, "Where did this come from?");
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gGlobalCache = new gfxFontCache();
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if (!gGlobalCache) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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RegisterStrongMemoryReporter(new MemoryReporter());
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return NS_OK;
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}
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void
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gfxFontCache::Shutdown()
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{
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delete gGlobalCache;
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gGlobalCache = nullptr;
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#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
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printf("Textrun storage high water mark=%d\n", gTextRunStorageHighWaterMark);
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printf("Total number of fonts=%d\n", gFontCount);
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printf("Total glyph extents allocated=%d (size %d)\n", gGlyphExtentsCount,
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int(gGlyphExtentsCount*sizeof(gfxGlyphExtents)));
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printf("Total glyph extents width-storage size allocated=%d\n", gGlyphExtentsWidthsTotalSize);
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printf("Number of simple glyph extents eagerly requested=%d\n", gGlyphExtentsSetupEagerSimple);
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printf("Number of tight glyph extents eagerly requested=%d\n", gGlyphExtentsSetupEagerTight);
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printf("Number of tight glyph extents lazily requested=%d\n", gGlyphExtentsSetupLazyTight);
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printf("Number of simple glyph extent setups that fell back to tight=%d\n", gGlyphExtentsSetupFallBackToTight);
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#endif
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}
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gfxFontCache::gfxFontCache()
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: nsExpirationTracker<gfxFont,3>(FONT_TIMEOUT_SECONDS * 1000,
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"gfxFontCache")
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{
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nsCOMPtr<nsIObserverService> obs = GetObserverService();
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if (obs) {
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obs->AddObserver(new Observer, "memory-pressure", false);
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}
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#ifndef RELEASE_OR_BETA
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// Currently disabled for release builds, due to unexplained crashes
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// during expiration; see bug 717175 & 894798.
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mWordCacheExpirationTimer = do_CreateInstance("@mozilla.org/timer;1");
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if (mWordCacheExpirationTimer) {
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mWordCacheExpirationTimer->
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InitWithFuncCallback(WordCacheExpirationTimerCallback, this,
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SHAPED_WORD_TIMEOUT_SECONDS * 1000,
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nsITimer::TYPE_REPEATING_SLACK);
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}
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#endif
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}
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gfxFontCache::~gfxFontCache()
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{
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// Ensure the user font cache releases its references to font entries,
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// so they aren't kept alive after the font instances and font-list
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// have been shut down.
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gfxUserFontSet::UserFontCache::Shutdown();
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if (mWordCacheExpirationTimer) {
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mWordCacheExpirationTimer->Cancel();
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mWordCacheExpirationTimer = nullptr;
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}
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// Expire everything that has a zero refcount, so we don't leak them.
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AgeAllGenerations();
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// All fonts should be gone.
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NS_WARNING_ASSERTION(mFonts.Count() == 0,
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"Fonts still alive while shutting down gfxFontCache");
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// Note that we have to delete everything through the expiration
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// tracker, since there might be fonts not in the hashtable but in
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// the tracker.
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}
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bool
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gfxFontCache::HashEntry::KeyEquals(const KeyTypePointer aKey) const
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{
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const gfxCharacterMap* fontUnicodeRangeMap = mFont->GetUnicodeRangeMap();
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return aKey->mFontEntry == mFont->GetFontEntry() &&
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aKey->mStyle->Equals(*mFont->GetStyle()) &&
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((!aKey->mUnicodeRangeMap && !fontUnicodeRangeMap) ||
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(aKey->mUnicodeRangeMap && fontUnicodeRangeMap &&
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aKey->mUnicodeRangeMap->Equals(fontUnicodeRangeMap)));
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}
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already_AddRefed<gfxFont>
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gfxFontCache::Lookup(const gfxFontEntry* aFontEntry,
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const gfxFontStyle* aStyle,
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const gfxCharacterMap* aUnicodeRangeMap)
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{
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Key key(aFontEntry, aStyle, aUnicodeRangeMap);
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HashEntry *entry = mFonts.GetEntry(key);
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if (!entry)
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return nullptr;
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RefPtr<gfxFont> font = entry->mFont;
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return font.forget();
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}
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void
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gfxFontCache::AddNew(gfxFont *aFont)
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{
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Key key(aFont->GetFontEntry(), aFont->GetStyle(),
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aFont->GetUnicodeRangeMap());
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HashEntry *entry = mFonts.PutEntry(key);
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if (!entry)
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return;
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gfxFont *oldFont = entry->mFont;
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entry->mFont = aFont;
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// Assert that we can find the entry we just put in (this fails if the key
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// has a NaN float value in it, e.g. 'sizeAdjust').
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MOZ_ASSERT(entry == mFonts.GetEntry(key));
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// If someone's asked us to replace an existing font entry, then that's a
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// bit weird, but let it happen, and expire the old font if it's not used.
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if (oldFont && oldFont->GetExpirationState()->IsTracked()) {
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// if oldFont == aFont, recount should be > 0,
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// so we shouldn't be here.
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NS_ASSERTION(aFont != oldFont, "new font is tracked for expiry!");
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NotifyExpired(oldFont);
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}
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}
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void
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gfxFontCache::NotifyReleased(gfxFont *aFont)
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{
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nsresult rv = AddObject(aFont);
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if (NS_FAILED(rv)) {
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// We couldn't track it for some reason. Kill it now.
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DestroyFont(aFont);
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}
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// Note that we might have fonts that aren't in the hashtable, perhaps because
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// of OOM adding to the hashtable or because someone did an AddNew where
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// we already had a font. These fonts are added to the expiration tracker
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// anyway, even though Lookup can't resurrect them. Eventually they will
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// expire and be deleted.
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}
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void
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gfxFontCache::NotifyExpired(gfxFont *aFont)
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{
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aFont->ClearCachedWords();
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RemoveObject(aFont);
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DestroyFont(aFont);
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}
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void
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gfxFontCache::DestroyFont(gfxFont *aFont)
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{
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Key key(aFont->GetFontEntry(), aFont->GetStyle(),
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aFont->GetUnicodeRangeMap());
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HashEntry *entry = mFonts.GetEntry(key);
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if (entry && entry->mFont == aFont) {
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mFonts.RemoveEntry(entry);
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}
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NS_ASSERTION(aFont->GetRefCount() == 0,
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"Destroying with non-zero ref count!");
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delete aFont;
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}
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/*static*/
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void
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gfxFontCache::WordCacheExpirationTimerCallback(nsITimer* aTimer, void* aCache)
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{
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gfxFontCache* cache = static_cast<gfxFontCache*>(aCache);
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for (auto it = cache->mFonts.Iter(); !it.Done(); it.Next()) {
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it.Get()->mFont->AgeCachedWords();
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}
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}
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void
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gfxFontCache::FlushShapedWordCaches()
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{
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for (auto it = mFonts.Iter(); !it.Done(); it.Next()) {
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it.Get()->mFont->ClearCachedWords();
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}
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}
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void
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gfxFontCache::AddSizeOfExcludingThis(MallocSizeOf aMallocSizeOf,
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FontCacheSizes* aSizes) const
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{
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// TODO: add the overhead of the expiration tracker (generation arrays)
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aSizes->mFontInstances += mFonts.ShallowSizeOfExcludingThis(aMallocSizeOf);
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for (auto iter = mFonts.ConstIter(); !iter.Done(); iter.Next()) {
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iter.Get()->mFont->AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
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}
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}
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void
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gfxFontCache::AddSizeOfIncludingThis(MallocSizeOf aMallocSizeOf,
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FontCacheSizes* aSizes) const
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{
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aSizes->mFontInstances += aMallocSizeOf(this);
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AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
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}
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#define MAX_SSXX_VALUE 99
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#define MAX_CVXX_VALUE 99
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static void
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LookupAlternateValues(gfxFontFeatureValueSet *featureLookup,
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const nsAString& aFamily,
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const nsTArray<gfxAlternateValue>& altValue,
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nsTArray<gfxFontFeature>& aFontFeatures)
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{
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uint32_t numAlternates = altValue.Length();
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for (uint32_t i = 0; i < numAlternates; i++) {
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const gfxAlternateValue& av = altValue.ElementAt(i);
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AutoTArray<uint32_t,4> values;
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// map <family, name, feature> ==> <values>
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bool found =
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featureLookup->GetFontFeatureValuesFor(aFamily, av.alternate,
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av.value, values);
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uint32_t numValues = values.Length();
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// nothing defined, skip
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if (!found || numValues == 0) {
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continue;
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}
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gfxFontFeature feature;
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if (av.alternate == NS_FONT_VARIANT_ALTERNATES_CHARACTER_VARIANT) {
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NS_ASSERTION(numValues <= 2,
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"too many values allowed for character-variant");
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// character-variant(12 3) ==> 'cv12' = 3
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uint32_t nn = values.ElementAt(0);
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// ignore values greater than 99
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if (nn == 0 || nn > MAX_CVXX_VALUE) {
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continue;
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}
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feature.mValue = 1;
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if (numValues > 1) {
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feature.mValue = values.ElementAt(1);
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}
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feature.mTag = HB_TAG('c','v',('0' + nn / 10), ('0' + nn % 10));
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aFontFeatures.AppendElement(feature);
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} else if (av.alternate == NS_FONT_VARIANT_ALTERNATES_STYLESET) {
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// styleset(1 2 7) ==> 'ss01' = 1, 'ss02' = 1, 'ss07' = 1
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feature.mValue = 1;
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for (uint32_t v = 0; v < numValues; v++) {
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uint32_t nn = values.ElementAt(v);
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if (nn == 0 || nn > MAX_SSXX_VALUE) {
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continue;
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}
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feature.mTag = HB_TAG('s','s',('0' + nn / 10), ('0' + nn % 10));
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aFontFeatures.AppendElement(feature);
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}
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} else {
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NS_ASSERTION(numValues == 1,
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"too many values for font-specific font-variant-alternates");
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feature.mValue = values.ElementAt(0);
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switch (av.alternate) {
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case NS_FONT_VARIANT_ALTERNATES_STYLISTIC: // salt
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feature.mTag = HB_TAG('s','a','l','t');
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break;
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case NS_FONT_VARIANT_ALTERNATES_SWASH: // swsh, cswh
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feature.mTag = HB_TAG('s','w','s','h');
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aFontFeatures.AppendElement(feature);
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feature.mTag = HB_TAG('c','s','w','h');
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break;
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case NS_FONT_VARIANT_ALTERNATES_ORNAMENTS: // ornm
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feature.mTag = HB_TAG('o','r','n','m');
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break;
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case NS_FONT_VARIANT_ALTERNATES_ANNOTATION: // nalt
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feature.mTag = HB_TAG('n','a','l','t');
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break;
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default:
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feature.mTag = 0;
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break;
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}
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NS_ASSERTION(feature.mTag, "unsupported alternate type");
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if (!feature.mTag) {
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continue;
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}
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aFontFeatures.AppendElement(feature);
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}
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}
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}
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/* static */ void
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gfxFontShaper::MergeFontFeatures(
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const gfxFontStyle *aStyle,
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const nsTArray<gfxFontFeature>& aFontFeatures,
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bool aDisableLigatures,
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const nsAString& aFamilyName,
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bool aAddSmallCaps,
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void (*aHandleFeature)(const uint32_t&, uint32_t&, void*),
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void* aHandleFeatureData)
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{
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uint32_t numAlts = aStyle->alternateValues.Length();
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const nsTArray<gfxFontFeature>& styleRuleFeatures =
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aStyle->featureSettings;
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// Bail immediately if nothing to do, which is the common case.
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if (styleRuleFeatures.IsEmpty() &&
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aFontFeatures.IsEmpty() &&
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!aDisableLigatures &&
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aStyle->variantCaps == NS_FONT_VARIANT_CAPS_NORMAL &&
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aStyle->variantSubSuper == NS_FONT_VARIANT_POSITION_NORMAL &&
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numAlts == 0) {
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return;
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}
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nsDataHashtable<nsUint32HashKey,uint32_t> mergedFeatures;
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// Ligature features are enabled by default in the generic shaper,
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// so we explicitly turn them off if necessary (for letter-spacing)
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if (aDisableLigatures) {
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mergedFeatures.Put(HB_TAG('l','i','g','a'), 0);
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mergedFeatures.Put(HB_TAG('c','l','i','g'), 0);
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}
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// add feature values from font
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uint32_t i, count;
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count = aFontFeatures.Length();
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for (i = 0; i < count; i++) {
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const gfxFontFeature& feature = aFontFeatures.ElementAt(i);
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mergedFeatures.Put(feature.mTag, feature.mValue);
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}
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// font-variant-caps - handled here due to the need for fallback handling
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// petite caps cases can fallback to appropriate smallcaps
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uint32_t variantCaps = aStyle->variantCaps;
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switch (variantCaps) {
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case NS_FONT_VARIANT_CAPS_NORMAL:
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break;
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case NS_FONT_VARIANT_CAPS_ALLSMALL:
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mergedFeatures.Put(HB_TAG('c','2','s','c'), 1);
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// fall through to the small-caps case
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MOZ_FALLTHROUGH;
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case NS_FONT_VARIANT_CAPS_SMALLCAPS:
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mergedFeatures.Put(HB_TAG('s','m','c','p'), 1);
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break;
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|
case NS_FONT_VARIANT_CAPS_ALLPETITE:
|
|
mergedFeatures.Put(aAddSmallCaps ? HB_TAG('c','2','s','c') :
|
|
HB_TAG('c','2','p','c'), 1);
|
|
// fall through to the petite-caps case
|
|
MOZ_FALLTHROUGH;
|
|
|
|
case NS_FONT_VARIANT_CAPS_PETITECAPS:
|
|
mergedFeatures.Put(aAddSmallCaps ? HB_TAG('s','m','c','p') :
|
|
HB_TAG('p','c','a','p'), 1);
|
|
break;
|
|
|
|
case NS_FONT_VARIANT_CAPS_TITLING:
|
|
mergedFeatures.Put(HB_TAG('t','i','t','l'), 1);
|
|
break;
|
|
|
|
case NS_FONT_VARIANT_CAPS_UNICASE:
|
|
mergedFeatures.Put(HB_TAG('u','n','i','c'), 1);
|
|
break;
|
|
|
|
default:
|
|
MOZ_ASSERT_UNREACHABLE("Unexpected variantCaps");
|
|
break;
|
|
}
|
|
|
|
// font-variant-position - handled here due to the need for fallback
|
|
switch (aStyle->variantSubSuper) {
|
|
case NS_FONT_VARIANT_POSITION_NORMAL:
|
|
break;
|
|
case NS_FONT_VARIANT_POSITION_SUPER:
|
|
mergedFeatures.Put(HB_TAG('s','u','p','s'), 1);
|
|
break;
|
|
case NS_FONT_VARIANT_POSITION_SUB:
|
|
mergedFeatures.Put(HB_TAG('s','u','b','s'), 1);
|
|
break;
|
|
default:
|
|
MOZ_ASSERT_UNREACHABLE("Unexpected variantSubSuper");
|
|
break;
|
|
}
|
|
|
|
// add font-specific feature values from style rules
|
|
if (aStyle->featureValueLookup && numAlts > 0) {
|
|
AutoTArray<gfxFontFeature,4> featureList;
|
|
|
|
// insert list of alternate feature settings
|
|
LookupAlternateValues(aStyle->featureValueLookup, aFamilyName,
|
|
aStyle->alternateValues, featureList);
|
|
|
|
count = featureList.Length();
|
|
for (i = 0; i < count; i++) {
|
|
const gfxFontFeature& feature = featureList.ElementAt(i);
|
|
mergedFeatures.Put(feature.mTag, feature.mValue);
|
|
}
|
|
}
|
|
|
|
// add feature values from style rules
|
|
count = styleRuleFeatures.Length();
|
|
for (i = 0; i < count; i++) {
|
|
const gfxFontFeature& feature = styleRuleFeatures.ElementAt(i);
|
|
mergedFeatures.Put(feature.mTag, feature.mValue);
|
|
}
|
|
|
|
if (mergedFeatures.Count() != 0) {
|
|
for (auto iter = mergedFeatures.Iter(); !iter.Done(); iter.Next()) {
|
|
aHandleFeature(iter.Key(), iter.Data(), aHandleFeatureData);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Work out whether cairo will snap inter-glyph spacing to pixels.
|
|
//
|
|
// Layout does not align text to pixel boundaries, so, with font drawing
|
|
// backends that snap glyph positions to pixels, it is important that
|
|
// inter-glyph spacing within words is always an integer number of pixels.
|
|
// This ensures that the drawing backend snaps all of the word's glyphs in the
|
|
// same direction and so inter-glyph spacing remains the same.
|
|
//
|
|
/* static */ void
|
|
gfxFontShaper::GetRoundOffsetsToPixels(DrawTarget* aDrawTarget,
|
|
bool* aRoundX, bool* aRoundY)
|
|
{
|
|
*aRoundX = false;
|
|
// Could do something fancy here for ScaleFactors of
|
|
// AxisAlignedTransforms, but we leave things simple.
|
|
// Not much point rounding if a matrix will mess things up anyway.
|
|
// Also return false for non-cairo contexts.
|
|
if (aDrawTarget->GetTransform().HasNonTranslation()) {
|
|
*aRoundY = false;
|
|
return;
|
|
}
|
|
|
|
// All raster backends snap glyphs to pixels vertically.
|
|
// Print backends set CAIRO_HINT_METRICS_OFF.
|
|
*aRoundY = true;
|
|
|
|
cairo_t* cr = gfxFont::RefCairo(aDrawTarget);
|
|
cairo_scaled_font_t *scaled_font = cairo_get_scaled_font(cr);
|
|
|
|
// bug 1198921 - this sometimes fails under Windows for whatver reason
|
|
NS_ASSERTION(scaled_font, "null cairo scaled font should never be returned "
|
|
"by cairo_get_scaled_font");
|
|
if (!scaled_font) {
|
|
*aRoundX = true; // default to the same as the fallback path below
|
|
return;
|
|
}
|
|
|
|
// Sometimes hint metrics gets set for us, most notably for printing.
|
|
cairo_font_options_t *font_options = cairo_font_options_create();
|
|
cairo_scaled_font_get_font_options(scaled_font, font_options);
|
|
cairo_hint_metrics_t hint_metrics =
|
|
cairo_font_options_get_hint_metrics(font_options);
|
|
cairo_font_options_destroy(font_options);
|
|
|
|
switch (hint_metrics) {
|
|
case CAIRO_HINT_METRICS_OFF:
|
|
*aRoundY = false;
|
|
return;
|
|
case CAIRO_HINT_METRICS_DEFAULT:
|
|
// Here we mimic what cairo surface/font backends do. Printing
|
|
// surfaces have already been handled by hint_metrics. The
|
|
// fallback show_glyphs implementation composites pixel-aligned
|
|
// glyph surfaces, so we just pick surface/font combinations that
|
|
// override this.
|
|
switch (cairo_scaled_font_get_type(scaled_font)) {
|
|
#if CAIRO_HAS_DWRITE_FONT // dwrite backend is not in std cairo releases yet
|
|
case CAIRO_FONT_TYPE_DWRITE:
|
|
// show_glyphs is implemented on the font and so is used for
|
|
// all surface types; however, it may pixel-snap depending on
|
|
// the dwrite rendering mode
|
|
if (!cairo_dwrite_scaled_font_get_force_GDI_classic(scaled_font) &&
|
|
gfxWindowsPlatform::GetPlatform()->DWriteMeasuringMode() ==
|
|
DWRITE_MEASURING_MODE_NATURAL) {
|
|
return;
|
|
}
|
|
MOZ_FALLTHROUGH;
|
|
#endif
|
|
case CAIRO_FONT_TYPE_QUARTZ:
|
|
// Quartz surfaces implement show_glyphs for Quartz fonts
|
|
if (cairo_surface_get_type(cairo_get_target(cr)) ==
|
|
CAIRO_SURFACE_TYPE_QUARTZ) {
|
|
return;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
case CAIRO_HINT_METRICS_ON:
|
|
break;
|
|
}
|
|
*aRoundX = true;
|
|
}
|
|
|
|
void
|
|
gfxShapedText::SetupClusterBoundaries(uint32_t aOffset,
|
|
const char16_t *aString,
|
|
uint32_t aLength)
|
|
{
|
|
CompressedGlyph *glyphs = GetCharacterGlyphs() + aOffset;
|
|
|
|
gfxTextRun::CompressedGlyph extendCluster;
|
|
extendCluster.SetComplex(false, true, 0);
|
|
|
|
ClusterIterator iter(aString, aLength);
|
|
|
|
// the ClusterIterator won't be able to tell us if the string
|
|
// _begins_ with a cluster-extender, so we handle that here
|
|
if (aLength) {
|
|
uint32_t ch = *aString;
|
|
if (aLength > 1 && NS_IS_HIGH_SURROGATE(ch) &&
|
|
NS_IS_LOW_SURROGATE(aString[1])) {
|
|
ch = SURROGATE_TO_UCS4(ch, aString[1]);
|
|
}
|
|
if (IsClusterExtender(ch)) {
|
|
*glyphs = extendCluster;
|
|
}
|
|
}
|
|
|
|
while (!iter.AtEnd()) {
|
|
if (*iter == char16_t(' ')) {
|
|
glyphs->SetIsSpace();
|
|
}
|
|
// advance iter to the next cluster-start (or end of text)
|
|
iter.Next();
|
|
// step past the first char of the cluster
|
|
aString++;
|
|
glyphs++;
|
|
// mark all the rest as cluster-continuations
|
|
while (aString < iter) {
|
|
*glyphs = extendCluster;
|
|
glyphs++;
|
|
aString++;
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
gfxShapedText::SetupClusterBoundaries(uint32_t aOffset,
|
|
const uint8_t *aString,
|
|
uint32_t aLength)
|
|
{
|
|
CompressedGlyph *glyphs = GetCharacterGlyphs() + aOffset;
|
|
const uint8_t *limit = aString + aLength;
|
|
|
|
while (aString < limit) {
|
|
if (*aString == uint8_t(' ')) {
|
|
glyphs->SetIsSpace();
|
|
}
|
|
aString++;
|
|
glyphs++;
|
|
}
|
|
}
|
|
|
|
gfxShapedText::DetailedGlyph *
|
|
gfxShapedText::AllocateDetailedGlyphs(uint32_t aIndex, uint32_t aCount)
|
|
{
|
|
NS_ASSERTION(aIndex < GetLength(), "Index out of range");
|
|
|
|
if (!mDetailedGlyphs) {
|
|
mDetailedGlyphs = MakeUnique<DetailedGlyphStore>();
|
|
}
|
|
|
|
return mDetailedGlyphs->Allocate(aIndex, aCount);
|
|
}
|
|
|
|
void
|
|
gfxShapedText::SetGlyphs(uint32_t aIndex, CompressedGlyph aGlyph,
|
|
const DetailedGlyph *aGlyphs)
|
|
{
|
|
NS_ASSERTION(!aGlyph.IsSimpleGlyph(), "Simple glyphs not handled here");
|
|
NS_ASSERTION(aIndex > 0 || aGlyph.IsLigatureGroupStart(),
|
|
"First character can't be a ligature continuation!");
|
|
|
|
uint32_t glyphCount = aGlyph.GetGlyphCount();
|
|
if (glyphCount > 0) {
|
|
DetailedGlyph *details = AllocateDetailedGlyphs(aIndex, glyphCount);
|
|
memcpy(details, aGlyphs, sizeof(DetailedGlyph)*glyphCount);
|
|
}
|
|
GetCharacterGlyphs()[aIndex] = aGlyph;
|
|
}
|
|
|
|
#define ZWNJ 0x200C
|
|
#define ZWJ 0x200D
|
|
static inline bool
|
|
IsDefaultIgnorable(uint32_t aChar)
|
|
{
|
|
return GetIdentifierModification(aChar) == XIDMOD_DEFAULT_IGNORABLE ||
|
|
aChar == ZWNJ || aChar == ZWJ;
|
|
}
|
|
|
|
void
|
|
gfxShapedText::SetMissingGlyph(uint32_t aIndex, uint32_t aChar, gfxFont *aFont)
|
|
{
|
|
uint8_t category = GetGeneralCategory(aChar);
|
|
if (category >= HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK &&
|
|
category <= HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)
|
|
{
|
|
GetCharacterGlyphs()[aIndex].SetComplex(false, true, 0);
|
|
}
|
|
|
|
DetailedGlyph *details = AllocateDetailedGlyphs(aIndex, 1);
|
|
|
|
details->mGlyphID = aChar;
|
|
if (IsDefaultIgnorable(aChar)) {
|
|
// Setting advance width to zero will prevent drawing the hexbox
|
|
details->mAdvance = 0;
|
|
} else {
|
|
gfxFloat width =
|
|
std::max(aFont->GetMetrics(gfxFont::eHorizontal).aveCharWidth,
|
|
gfxFloat(gfxFontMissingGlyphs::GetDesiredMinWidth(aChar,
|
|
mAppUnitsPerDevUnit)));
|
|
details->mAdvance = uint32_t(width * mAppUnitsPerDevUnit);
|
|
}
|
|
details->mXOffset = 0;
|
|
details->mYOffset = 0;
|
|
GetCharacterGlyphs()[aIndex].SetMissing(1);
|
|
}
|
|
|
|
bool
|
|
gfxShapedText::FilterIfIgnorable(uint32_t aIndex, uint32_t aCh)
|
|
{
|
|
if (IsDefaultIgnorable(aCh)) {
|
|
// There are a few default-ignorables of Letter category (currently,
|
|
// just the Hangul filler characters) that we'd better not discard
|
|
// if they're followed by additional characters in the same cluster.
|
|
// Some fonts use them to carry the width of a whole cluster of
|
|
// combining jamos; see bug 1238243.
|
|
if (GetGenCategory(aCh) == nsIUGenCategory::kLetter &&
|
|
aIndex + 1 < GetLength() &&
|
|
!GetCharacterGlyphs()[aIndex + 1].IsClusterStart()) {
|
|
return false;
|
|
}
|
|
DetailedGlyph *details = AllocateDetailedGlyphs(aIndex, 1);
|
|
details->mGlyphID = aCh;
|
|
details->mAdvance = 0;
|
|
details->mXOffset = 0;
|
|
details->mYOffset = 0;
|
|
GetCharacterGlyphs()[aIndex].SetMissing(1);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void
|
|
gfxShapedText::AdjustAdvancesForSyntheticBold(float aSynBoldOffset,
|
|
uint32_t aOffset,
|
|
uint32_t aLength)
|
|
{
|
|
uint32_t synAppUnitOffset = aSynBoldOffset * mAppUnitsPerDevUnit;
|
|
CompressedGlyph *charGlyphs = GetCharacterGlyphs();
|
|
for (uint32_t i = aOffset; i < aOffset + aLength; ++i) {
|
|
CompressedGlyph *glyphData = charGlyphs + i;
|
|
if (glyphData->IsSimpleGlyph()) {
|
|
// simple glyphs ==> just add the advance
|
|
int32_t advance = glyphData->GetSimpleAdvance() + synAppUnitOffset;
|
|
if (CompressedGlyph::IsSimpleAdvance(advance)) {
|
|
glyphData->SetSimpleGlyph(advance, glyphData->GetSimpleGlyph());
|
|
} else {
|
|
// rare case, tested by making this the default
|
|
uint32_t glyphIndex = glyphData->GetSimpleGlyph();
|
|
glyphData->SetComplex(true, true, 1);
|
|
DetailedGlyph detail = {glyphIndex, advance, 0, 0};
|
|
SetGlyphs(i, *glyphData, &detail);
|
|
}
|
|
} else {
|
|
// complex glyphs ==> add offset at cluster/ligature boundaries
|
|
uint32_t detailedLength = glyphData->GetGlyphCount();
|
|
if (detailedLength) {
|
|
DetailedGlyph *details = GetDetailedGlyphs(i);
|
|
if (!details) {
|
|
continue;
|
|
}
|
|
if (IsRightToLeft()) {
|
|
details[0].mAdvance += synAppUnitOffset;
|
|
} else {
|
|
details[detailedLength - 1].mAdvance += synAppUnitOffset;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
gfxFont::RunMetrics::CombineWith(const RunMetrics& aOther, bool aOtherIsOnLeft)
|
|
{
|
|
mAscent = std::max(mAscent, aOther.mAscent);
|
|
mDescent = std::max(mDescent, aOther.mDescent);
|
|
if (aOtherIsOnLeft) {
|
|
mBoundingBox =
|
|
(mBoundingBox + gfxPoint(aOther.mAdvanceWidth, 0)).Union(aOther.mBoundingBox);
|
|
} else {
|
|
mBoundingBox =
|
|
mBoundingBox.Union(aOther.mBoundingBox + gfxPoint(mAdvanceWidth, 0));
|
|
}
|
|
mAdvanceWidth += aOther.mAdvanceWidth;
|
|
}
|
|
|
|
gfxFont::gfxFont(gfxFontEntry *aFontEntry, const gfxFontStyle *aFontStyle,
|
|
AntialiasOption anAAOption, cairo_scaled_font_t *aScaledFont) :
|
|
mScaledFont(aScaledFont),
|
|
mFontEntry(aFontEntry), mIsValid(true),
|
|
mApplySyntheticBold(false),
|
|
mMathInitialized(false),
|
|
mStyle(*aFontStyle),
|
|
mAdjustedSize(0.0),
|
|
mFUnitsConvFactor(-1.0f), // negative to indicate "not yet initialized"
|
|
mAntialiasOption(anAAOption)
|
|
{
|
|
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
|
|
++gFontCount;
|
|
#endif
|
|
mKerningSet = HasFeatureSet(HB_TAG('k','e','r','n'), mKerningEnabled);
|
|
}
|
|
|
|
gfxFont::~gfxFont()
|
|
{
|
|
mFontEntry->NotifyFontDestroyed(this);
|
|
|
|
if (mGlyphChangeObservers) {
|
|
for (auto it = mGlyphChangeObservers->Iter(); !it.Done(); it.Next()) {
|
|
it.Get()->GetKey()->ForgetFont();
|
|
}
|
|
}
|
|
}
|
|
|
|
gfxFloat
|
|
gfxFont::GetGlyphHAdvance(DrawTarget* aDrawTarget, uint16_t aGID)
|
|
{
|
|
if (!SetupCairoFont(aDrawTarget)) {
|
|
return 0;
|
|
}
|
|
if (ProvidesGlyphWidths()) {
|
|
return GetGlyphWidth(*aDrawTarget, aGID) / 65536.0;
|
|
}
|
|
if (mFUnitsConvFactor < 0.0f) {
|
|
GetMetrics(eHorizontal);
|
|
}
|
|
NS_ASSERTION(mFUnitsConvFactor >= 0.0f,
|
|
"missing font unit conversion factor");
|
|
if (!mHarfBuzzShaper) {
|
|
mHarfBuzzShaper = MakeUnique<gfxHarfBuzzShaper>(this);
|
|
}
|
|
gfxHarfBuzzShaper* shaper =
|
|
static_cast<gfxHarfBuzzShaper*>(mHarfBuzzShaper.get());
|
|
if (!shaper->Initialize()) {
|
|
return 0;
|
|
}
|
|
return shaper->GetGlyphHAdvance(aGID) / 65536.0;
|
|
}
|
|
|
|
static void
|
|
CollectLookupsByFeature(hb_face_t *aFace, hb_tag_t aTableTag,
|
|
uint32_t aFeatureIndex, hb_set_t *aLookups)
|
|
{
|
|
uint32_t lookups[32];
|
|
uint32_t i, len, offset;
|
|
|
|
offset = 0;
|
|
do {
|
|
len = ArrayLength(lookups);
|
|
hb_ot_layout_feature_get_lookups(aFace, aTableTag, aFeatureIndex,
|
|
offset, &len, lookups);
|
|
for (i = 0; i < len; i++) {
|
|
hb_set_add(aLookups, lookups[i]);
|
|
}
|
|
offset += len;
|
|
} while (len == ArrayLength(lookups));
|
|
}
|
|
|
|
static void
|
|
CollectLookupsByLanguage(hb_face_t *aFace, hb_tag_t aTableTag,
|
|
const nsTHashtable<nsUint32HashKey>&
|
|
aSpecificFeatures,
|
|
hb_set_t *aOtherLookups,
|
|
hb_set_t *aSpecificFeatureLookups,
|
|
uint32_t aScriptIndex, uint32_t aLangIndex)
|
|
{
|
|
uint32_t reqFeatureIndex;
|
|
if (hb_ot_layout_language_get_required_feature_index(aFace, aTableTag,
|
|
aScriptIndex,
|
|
aLangIndex,
|
|
&reqFeatureIndex)) {
|
|
CollectLookupsByFeature(aFace, aTableTag, reqFeatureIndex,
|
|
aOtherLookups);
|
|
}
|
|
|
|
uint32_t featureIndexes[32];
|
|
uint32_t i, len, offset;
|
|
|
|
offset = 0;
|
|
do {
|
|
len = ArrayLength(featureIndexes);
|
|
hb_ot_layout_language_get_feature_indexes(aFace, aTableTag,
|
|
aScriptIndex, aLangIndex,
|
|
offset, &len, featureIndexes);
|
|
|
|
for (i = 0; i < len; i++) {
|
|
uint32_t featureIndex = featureIndexes[i];
|
|
|
|
// get the feature tag
|
|
hb_tag_t featureTag;
|
|
uint32_t tagLen = 1;
|
|
hb_ot_layout_language_get_feature_tags(aFace, aTableTag,
|
|
aScriptIndex, aLangIndex,
|
|
offset + i, &tagLen,
|
|
&featureTag);
|
|
|
|
// collect lookups
|
|
hb_set_t *lookups = aSpecificFeatures.GetEntry(featureTag) ?
|
|
aSpecificFeatureLookups : aOtherLookups;
|
|
CollectLookupsByFeature(aFace, aTableTag, featureIndex, lookups);
|
|
}
|
|
offset += len;
|
|
} while (len == ArrayLength(featureIndexes));
|
|
}
|
|
|
|
static bool
|
|
HasLookupRuleWithGlyphByScript(hb_face_t *aFace, hb_tag_t aTableTag,
|
|
hb_tag_t aScriptTag, uint32_t aScriptIndex,
|
|
uint16_t aGlyph,
|
|
const nsTHashtable<nsUint32HashKey>&
|
|
aDefaultFeatures,
|
|
bool& aHasDefaultFeatureWithGlyph)
|
|
{
|
|
uint32_t numLangs, lang;
|
|
hb_set_t *defaultFeatureLookups = hb_set_create();
|
|
hb_set_t *nonDefaultFeatureLookups = hb_set_create();
|
|
|
|
// default lang
|
|
CollectLookupsByLanguage(aFace, aTableTag, aDefaultFeatures,
|
|
nonDefaultFeatureLookups, defaultFeatureLookups,
|
|
aScriptIndex,
|
|
HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX);
|
|
|
|
// iterate over langs
|
|
numLangs = hb_ot_layout_script_get_language_tags(aFace, aTableTag,
|
|
aScriptIndex, 0,
|
|
nullptr, nullptr);
|
|
for (lang = 0; lang < numLangs; lang++) {
|
|
CollectLookupsByLanguage(aFace, aTableTag, aDefaultFeatures,
|
|
nonDefaultFeatureLookups,
|
|
defaultFeatureLookups,
|
|
aScriptIndex, lang);
|
|
}
|
|
|
|
// look for the glyph among default feature lookups
|
|
aHasDefaultFeatureWithGlyph = false;
|
|
hb_set_t *glyphs = hb_set_create();
|
|
hb_codepoint_t index = -1;
|
|
while (hb_set_next(defaultFeatureLookups, &index)) {
|
|
hb_ot_layout_lookup_collect_glyphs(aFace, aTableTag, index,
|
|
glyphs, glyphs, glyphs,
|
|
nullptr);
|
|
if (hb_set_has(glyphs, aGlyph)) {
|
|
aHasDefaultFeatureWithGlyph = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// look for the glyph among non-default feature lookups
|
|
// if no default feature lookups contained spaces
|
|
bool hasNonDefaultFeatureWithGlyph = false;
|
|
if (!aHasDefaultFeatureWithGlyph) {
|
|
hb_set_clear(glyphs);
|
|
index = -1;
|
|
while (hb_set_next(nonDefaultFeatureLookups, &index)) {
|
|
hb_ot_layout_lookup_collect_glyphs(aFace, aTableTag, index,
|
|
glyphs, glyphs, glyphs,
|
|
nullptr);
|
|
if (hb_set_has(glyphs, aGlyph)) {
|
|
hasNonDefaultFeatureWithGlyph = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
hb_set_destroy(glyphs);
|
|
hb_set_destroy(defaultFeatureLookups);
|
|
hb_set_destroy(nonDefaultFeatureLookups);
|
|
|
|
return aHasDefaultFeatureWithGlyph || hasNonDefaultFeatureWithGlyph;
|
|
}
|
|
|
|
static void
|
|
HasLookupRuleWithGlyph(hb_face_t *aFace, hb_tag_t aTableTag, bool& aHasGlyph,
|
|
hb_tag_t aSpecificFeature, bool& aHasGlyphSpecific,
|
|
uint16_t aGlyph)
|
|
{
|
|
// iterate over the scripts in the font
|
|
uint32_t numScripts, numLangs, script, lang;
|
|
hb_set_t *otherLookups = hb_set_create();
|
|
hb_set_t *specificFeatureLookups = hb_set_create();
|
|
nsTHashtable<nsUint32HashKey> specificFeature;
|
|
|
|
specificFeature.PutEntry(aSpecificFeature);
|
|
|
|
numScripts = hb_ot_layout_table_get_script_tags(aFace, aTableTag, 0,
|
|
nullptr, nullptr);
|
|
|
|
for (script = 0; script < numScripts; script++) {
|
|
// default lang
|
|
CollectLookupsByLanguage(aFace, aTableTag, specificFeature,
|
|
otherLookups, specificFeatureLookups,
|
|
script, HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX);
|
|
|
|
// iterate over langs
|
|
numLangs = hb_ot_layout_script_get_language_tags(aFace, HB_OT_TAG_GPOS,
|
|
script, 0,
|
|
nullptr, nullptr);
|
|
for (lang = 0; lang < numLangs; lang++) {
|
|
CollectLookupsByLanguage(aFace, aTableTag, specificFeature,
|
|
otherLookups, specificFeatureLookups,
|
|
script, lang);
|
|
}
|
|
}
|
|
|
|
// look for the glyph among non-specific feature lookups
|
|
hb_set_t *glyphs = hb_set_create();
|
|
hb_codepoint_t index = -1;
|
|
while (hb_set_next(otherLookups, &index)) {
|
|
hb_ot_layout_lookup_collect_glyphs(aFace, aTableTag, index,
|
|
glyphs, glyphs, glyphs,
|
|
nullptr);
|
|
if (hb_set_has(glyphs, aGlyph)) {
|
|
aHasGlyph = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// look for the glyph among specific feature lookups
|
|
hb_set_clear(glyphs);
|
|
index = -1;
|
|
while (hb_set_next(specificFeatureLookups, &index)) {
|
|
hb_ot_layout_lookup_collect_glyphs(aFace, aTableTag, index,
|
|
glyphs, glyphs, glyphs,
|
|
nullptr);
|
|
if (hb_set_has(glyphs, aGlyph)) {
|
|
aHasGlyphSpecific = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
hb_set_destroy(glyphs);
|
|
hb_set_destroy(specificFeatureLookups);
|
|
hb_set_destroy(otherLookups);
|
|
}
|
|
|
|
nsDataHashtable<nsUint32HashKey,Script> *gfxFont::sScriptTagToCode = nullptr;
|
|
nsTHashtable<nsUint32HashKey> *gfxFont::sDefaultFeatures = nullptr;
|
|
|
|
static inline bool
|
|
HasSubstitution(uint32_t *aBitVector, Script aScript) {
|
|
return (aBitVector[static_cast<uint32_t>(aScript) >> 5]
|
|
& (1 << (static_cast<uint32_t>(aScript) & 0x1f))) != 0;
|
|
}
|
|
|
|
// union of all default substitution features across scripts
|
|
static const hb_tag_t defaultFeatures[] = {
|
|
HB_TAG('a','b','v','f'),
|
|
HB_TAG('a','b','v','s'),
|
|
HB_TAG('a','k','h','n'),
|
|
HB_TAG('b','l','w','f'),
|
|
HB_TAG('b','l','w','s'),
|
|
HB_TAG('c','a','l','t'),
|
|
HB_TAG('c','c','m','p'),
|
|
HB_TAG('c','f','a','r'),
|
|
HB_TAG('c','j','c','t'),
|
|
HB_TAG('c','l','i','g'),
|
|
HB_TAG('f','i','n','2'),
|
|
HB_TAG('f','i','n','3'),
|
|
HB_TAG('f','i','n','a'),
|
|
HB_TAG('h','a','l','f'),
|
|
HB_TAG('h','a','l','n'),
|
|
HB_TAG('i','n','i','t'),
|
|
HB_TAG('i','s','o','l'),
|
|
HB_TAG('l','i','g','a'),
|
|
HB_TAG('l','j','m','o'),
|
|
HB_TAG('l','o','c','l'),
|
|
HB_TAG('l','t','r','a'),
|
|
HB_TAG('l','t','r','m'),
|
|
HB_TAG('m','e','d','2'),
|
|
HB_TAG('m','e','d','i'),
|
|
HB_TAG('m','s','e','t'),
|
|
HB_TAG('n','u','k','t'),
|
|
HB_TAG('p','r','e','f'),
|
|
HB_TAG('p','r','e','s'),
|
|
HB_TAG('p','s','t','f'),
|
|
HB_TAG('p','s','t','s'),
|
|
HB_TAG('r','c','l','t'),
|
|
HB_TAG('r','l','i','g'),
|
|
HB_TAG('r','k','r','f'),
|
|
HB_TAG('r','p','h','f'),
|
|
HB_TAG('r','t','l','a'),
|
|
HB_TAG('r','t','l','m'),
|
|
HB_TAG('t','j','m','o'),
|
|
HB_TAG('v','a','t','u'),
|
|
HB_TAG('v','e','r','t'),
|
|
HB_TAG('v','j','m','o')
|
|
};
|
|
|
|
void
|
|
gfxFont::CheckForFeaturesInvolvingSpace()
|
|
{
|
|
mFontEntry->mHasSpaceFeaturesInitialized = true;
|
|
|
|
bool log = LOG_FONTINIT_ENABLED();
|
|
TimeStamp start;
|
|
if (MOZ_UNLIKELY(log)) {
|
|
start = TimeStamp::Now();
|
|
}
|
|
|
|
bool result = false;
|
|
|
|
uint32_t spaceGlyph = GetSpaceGlyph();
|
|
if (!spaceGlyph) {
|
|
return;
|
|
}
|
|
|
|
hb_face_t *face = GetFontEntry()->GetHBFace();
|
|
|
|
// GSUB lookups - examine per script
|
|
if (hb_ot_layout_has_substitution(face)) {
|
|
|
|
// set up the script ==> code hashtable if needed
|
|
if (!sScriptTagToCode) {
|
|
sScriptTagToCode =
|
|
new nsDataHashtable<nsUint32HashKey,
|
|
Script>(size_t(Script::NUM_SCRIPT_CODES));
|
|
sScriptTagToCode->Put(HB_TAG('D','F','L','T'), Script::COMMON);
|
|
for (Script s = Script::ARABIC; s < Script::NUM_SCRIPT_CODES;
|
|
s = Script(static_cast<int>(s) + 1)) {
|
|
hb_script_t scriptTag = hb_script_t(GetScriptTagForCode(s));
|
|
hb_tag_t s1, s2;
|
|
hb_ot_tags_from_script(scriptTag, &s1, &s2);
|
|
sScriptTagToCode->Put(s1, s);
|
|
if (s2 != HB_OT_TAG_DEFAULT_SCRIPT) {
|
|
sScriptTagToCode->Put(s2, s);
|
|
}
|
|
}
|
|
|
|
uint32_t numDefaultFeatures = ArrayLength(defaultFeatures);
|
|
sDefaultFeatures =
|
|
new nsTHashtable<nsUint32HashKey>(numDefaultFeatures);
|
|
for (uint32_t i = 0; i < numDefaultFeatures; i++) {
|
|
sDefaultFeatures->PutEntry(defaultFeatures[i]);
|
|
}
|
|
}
|
|
|
|
// iterate over the scripts in the font
|
|
hb_tag_t scriptTags[8];
|
|
|
|
uint32_t len, offset = 0;
|
|
do {
|
|
len = ArrayLength(scriptTags);
|
|
hb_ot_layout_table_get_script_tags(face, HB_OT_TAG_GSUB, offset,
|
|
&len, scriptTags);
|
|
for (uint32_t i = 0; i < len; i++) {
|
|
bool isDefaultFeature = false;
|
|
Script s;
|
|
if (!HasLookupRuleWithGlyphByScript(face, HB_OT_TAG_GSUB,
|
|
scriptTags[i], offset + i,
|
|
spaceGlyph,
|
|
*sDefaultFeatures,
|
|
isDefaultFeature) ||
|
|
!sScriptTagToCode->Get(scriptTags[i], &s))
|
|
{
|
|
continue;
|
|
}
|
|
result = true;
|
|
uint32_t index = static_cast<uint32_t>(s) >> 5;
|
|
uint32_t bit = static_cast<uint32_t>(s) & 0x1f;
|
|
if (isDefaultFeature) {
|
|
mFontEntry->mDefaultSubSpaceFeatures[index] |= (1 << bit);
|
|
} else {
|
|
mFontEntry->mNonDefaultSubSpaceFeatures[index] |= (1 << bit);
|
|
}
|
|
}
|
|
offset += len;
|
|
} while (len == ArrayLength(scriptTags));
|
|
}
|
|
|
|
// spaces in default features of default script?
|
|
// ==> can't use word cache, skip GPOS analysis
|
|
bool canUseWordCache = true;
|
|
if (HasSubstitution(mFontEntry->mDefaultSubSpaceFeatures,
|
|
Script::COMMON)) {
|
|
canUseWordCache = false;
|
|
}
|
|
|
|
// GPOS lookups - distinguish kerning from non-kerning features
|
|
mFontEntry->mHasSpaceFeaturesKerning = false;
|
|
mFontEntry->mHasSpaceFeaturesNonKerning = false;
|
|
|
|
if (canUseWordCache && hb_ot_layout_has_positioning(face)) {
|
|
bool hasKerning = false, hasNonKerning = false;
|
|
HasLookupRuleWithGlyph(face, HB_OT_TAG_GPOS, hasNonKerning,
|
|
HB_TAG('k','e','r','n'), hasKerning, spaceGlyph);
|
|
if (hasKerning || hasNonKerning) {
|
|
result = true;
|
|
}
|
|
mFontEntry->mHasSpaceFeaturesKerning = hasKerning;
|
|
mFontEntry->mHasSpaceFeaturesNonKerning = hasNonKerning;
|
|
}
|
|
|
|
hb_face_destroy(face);
|
|
mFontEntry->mHasSpaceFeatures = result;
|
|
|
|
if (MOZ_UNLIKELY(log)) {
|
|
TimeDuration elapsed = TimeStamp::Now() - start;
|
|
LOG_FONTINIT((
|
|
"(fontinit-spacelookups) font: %s - "
|
|
"subst default: %8.8x %8.8x %8.8x %8.8x "
|
|
"subst non-default: %8.8x %8.8x %8.8x %8.8x "
|
|
"kerning: %s non-kerning: %s time: %6.3f\n",
|
|
NS_ConvertUTF16toUTF8(mFontEntry->Name()).get(),
|
|
mFontEntry->mDefaultSubSpaceFeatures[3],
|
|
mFontEntry->mDefaultSubSpaceFeatures[2],
|
|
mFontEntry->mDefaultSubSpaceFeatures[1],
|
|
mFontEntry->mDefaultSubSpaceFeatures[0],
|
|
mFontEntry->mNonDefaultSubSpaceFeatures[3],
|
|
mFontEntry->mNonDefaultSubSpaceFeatures[2],
|
|
mFontEntry->mNonDefaultSubSpaceFeatures[1],
|
|
mFontEntry->mNonDefaultSubSpaceFeatures[0],
|
|
(mFontEntry->mHasSpaceFeaturesKerning ? "true" : "false"),
|
|
(mFontEntry->mHasSpaceFeaturesNonKerning ? "true" : "false"),
|
|
elapsed.ToMilliseconds()
|
|
));
|
|
}
|
|
}
|
|
|
|
bool
|
|
gfxFont::HasSubstitutionRulesWithSpaceLookups(Script aRunScript)
|
|
{
|
|
NS_ASSERTION(GetFontEntry()->mHasSpaceFeaturesInitialized,
|
|
"need to initialize space lookup flags");
|
|
NS_ASSERTION(aRunScript < Script::NUM_SCRIPT_CODES, "weird script code");
|
|
if (aRunScript == Script::INVALID ||
|
|
aRunScript >= Script::NUM_SCRIPT_CODES) {
|
|
return false;
|
|
}
|
|
|
|
// default features have space lookups ==> true
|
|
if (HasSubstitution(mFontEntry->mDefaultSubSpaceFeatures,
|
|
Script::COMMON) ||
|
|
HasSubstitution(mFontEntry->mDefaultSubSpaceFeatures,
|
|
aRunScript))
|
|
{
|
|
return true;
|
|
}
|
|
|
|
// non-default features have space lookups and some type of
|
|
// font feature, in font or style is specified ==> true
|
|
if ((HasSubstitution(mFontEntry->mNonDefaultSubSpaceFeatures,
|
|
Script::COMMON) ||
|
|
HasSubstitution(mFontEntry->mNonDefaultSubSpaceFeatures,
|
|
aRunScript)) &&
|
|
(!mStyle.featureSettings.IsEmpty() ||
|
|
!mFontEntry->mFeatureSettings.IsEmpty()))
|
|
{
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
gfxFont::SpaceMayParticipateInShaping(Script aRunScript)
|
|
{
|
|
// avoid checking fonts known not to include default space-dependent features
|
|
if (MOZ_UNLIKELY(mFontEntry->mSkipDefaultFeatureSpaceCheck)) {
|
|
if (!mKerningSet && mStyle.featureSettings.IsEmpty() &&
|
|
mFontEntry->mFeatureSettings.IsEmpty()) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (FontCanSupportGraphite()) {
|
|
if (gfxPlatform::GetPlatform()->UseGraphiteShaping()) {
|
|
return mFontEntry->HasGraphiteSpaceContextuals();
|
|
}
|
|
}
|
|
|
|
// We record the presence of space-dependent features in the font entry
|
|
// so that subsequent instantiations for the same font face won't
|
|
// require us to re-check the tables; however, the actual check is done
|
|
// by gfxFont because not all font entry subclasses know how to create
|
|
// a harfbuzz face for introspection.
|
|
if (!mFontEntry->mHasSpaceFeaturesInitialized) {
|
|
CheckForFeaturesInvolvingSpace();
|
|
}
|
|
|
|
if (!mFontEntry->mHasSpaceFeatures) {
|
|
return false;
|
|
}
|
|
|
|
// if font has substitution rules or non-kerning positioning rules
|
|
// that involve spaces, bypass
|
|
if (HasSubstitutionRulesWithSpaceLookups(aRunScript) ||
|
|
mFontEntry->mHasSpaceFeaturesNonKerning) {
|
|
return true;
|
|
}
|
|
|
|
// if kerning explicitly enabled/disabled via font-feature-settings or
|
|
// font-kerning and kerning rules use spaces, only bypass when enabled
|
|
if (mKerningSet && mFontEntry->mHasSpaceFeaturesKerning) {
|
|
return mKerningEnabled;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
gfxFont::SupportsFeature(Script aScript, uint32_t aFeatureTag)
|
|
{
|
|
if (mGraphiteShaper && gfxPlatform::GetPlatform()->UseGraphiteShaping()) {
|
|
return GetFontEntry()->SupportsGraphiteFeature(aFeatureTag);
|
|
}
|
|
return GetFontEntry()->SupportsOpenTypeFeature(aScript, aFeatureTag);
|
|
}
|
|
|
|
bool
|
|
gfxFont::SupportsVariantCaps(Script aScript,
|
|
uint32_t aVariantCaps,
|
|
bool& aFallbackToSmallCaps,
|
|
bool& aSyntheticLowerToSmallCaps,
|
|
bool& aSyntheticUpperToSmallCaps)
|
|
{
|
|
bool ok = true; // cases without fallback are fine
|
|
aFallbackToSmallCaps = false;
|
|
aSyntheticLowerToSmallCaps = false;
|
|
aSyntheticUpperToSmallCaps = false;
|
|
switch (aVariantCaps) {
|
|
case NS_FONT_VARIANT_CAPS_SMALLCAPS:
|
|
ok = SupportsFeature(aScript, HB_TAG('s','m','c','p'));
|
|
if (!ok) {
|
|
aSyntheticLowerToSmallCaps = true;
|
|
}
|
|
break;
|
|
case NS_FONT_VARIANT_CAPS_ALLSMALL:
|
|
ok = SupportsFeature(aScript, HB_TAG('s','m','c','p')) &&
|
|
SupportsFeature(aScript, HB_TAG('c','2','s','c'));
|
|
if (!ok) {
|
|
aSyntheticLowerToSmallCaps = true;
|
|
aSyntheticUpperToSmallCaps = true;
|
|
}
|
|
break;
|
|
case NS_FONT_VARIANT_CAPS_PETITECAPS:
|
|
ok = SupportsFeature(aScript, HB_TAG('p','c','a','p'));
|
|
if (!ok) {
|
|
ok = SupportsFeature(aScript, HB_TAG('s','m','c','p'));
|
|
aFallbackToSmallCaps = ok;
|
|
}
|
|
if (!ok) {
|
|
aSyntheticLowerToSmallCaps = true;
|
|
}
|
|
break;
|
|
case NS_FONT_VARIANT_CAPS_ALLPETITE:
|
|
ok = SupportsFeature(aScript, HB_TAG('p','c','a','p')) &&
|
|
SupportsFeature(aScript, HB_TAG('c','2','p','c'));
|
|
if (!ok) {
|
|
ok = SupportsFeature(aScript, HB_TAG('s','m','c','p')) &&
|
|
SupportsFeature(aScript, HB_TAG('c','2','s','c'));
|
|
aFallbackToSmallCaps = ok;
|
|
}
|
|
if (!ok) {
|
|
aSyntheticLowerToSmallCaps = true;
|
|
aSyntheticUpperToSmallCaps = true;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
NS_ASSERTION(!(ok && (aSyntheticLowerToSmallCaps ||
|
|
aSyntheticUpperToSmallCaps)),
|
|
"shouldn't use synthetic features if we found real ones");
|
|
|
|
NS_ASSERTION(!(!ok && aFallbackToSmallCaps),
|
|
"if we found a usable fallback, that counts as ok");
|
|
|
|
return ok;
|
|
}
|
|
|
|
bool
|
|
gfxFont::SupportsSubSuperscript(uint32_t aSubSuperscript,
|
|
const uint8_t *aString,
|
|
uint32_t aLength, Script aRunScript)
|
|
{
|
|
NS_ConvertASCIItoUTF16 unicodeString(reinterpret_cast<const char*>(aString),
|
|
aLength);
|
|
return SupportsSubSuperscript(aSubSuperscript, unicodeString.get(),
|
|
aLength, aRunScript);
|
|
}
|
|
|
|
bool
|
|
gfxFont::SupportsSubSuperscript(uint32_t aSubSuperscript,
|
|
const char16_t *aString,
|
|
uint32_t aLength, Script aRunScript)
|
|
{
|
|
NS_ASSERTION(aSubSuperscript == NS_FONT_VARIANT_POSITION_SUPER ||
|
|
aSubSuperscript == NS_FONT_VARIANT_POSITION_SUB,
|
|
"unknown value of font-variant-position");
|
|
|
|
uint32_t feature = aSubSuperscript == NS_FONT_VARIANT_POSITION_SUPER ?
|
|
HB_TAG('s','u','p','s') : HB_TAG('s','u','b','s');
|
|
|
|
if (!SupportsFeature(aRunScript, feature)) {
|
|
return false;
|
|
}
|
|
|
|
// xxx - for graphite, don't really know how to sniff lookups so bail
|
|
if (mGraphiteShaper && gfxPlatform::GetPlatform()->UseGraphiteShaping()) {
|
|
return true;
|
|
}
|
|
|
|
if (!mHarfBuzzShaper) {
|
|
mHarfBuzzShaper = MakeUnique<gfxHarfBuzzShaper>(this);
|
|
}
|
|
gfxHarfBuzzShaper* shaper =
|
|
static_cast<gfxHarfBuzzShaper*>(mHarfBuzzShaper.get());
|
|
if (!shaper->Initialize()) {
|
|
return false;
|
|
}
|
|
|
|
// get the hbset containing input glyphs for the feature
|
|
const hb_set_t *inputGlyphs = mFontEntry->InputsForOpenTypeFeature(aRunScript, feature);
|
|
|
|
// create an hbset containing default glyphs for the script run
|
|
hb_set_t *defaultGlyphsInRun = hb_set_create();
|
|
|
|
// for each character, get the glyph id
|
|
for (uint32_t i = 0; i < aLength; i++) {
|
|
uint32_t ch = aString[i];
|
|
|
|
if ((i + 1 < aLength) && NS_IS_HIGH_SURROGATE(ch) &&
|
|
NS_IS_LOW_SURROGATE(aString[i + 1])) {
|
|
i++;
|
|
ch = SURROGATE_TO_UCS4(ch, aString[i]);
|
|
}
|
|
|
|
if (ch == 0xa0) {
|
|
ch = ' ';
|
|
}
|
|
|
|
hb_codepoint_t gid = shaper->GetNominalGlyph(ch);
|
|
hb_set_add(defaultGlyphsInRun, gid);
|
|
}
|
|
|
|
// intersect with input glyphs, if size is not the same ==> fallback
|
|
uint32_t origSize = hb_set_get_population(defaultGlyphsInRun);
|
|
hb_set_intersect(defaultGlyphsInRun, inputGlyphs);
|
|
uint32_t intersectionSize = hb_set_get_population(defaultGlyphsInRun);
|
|
hb_set_destroy(defaultGlyphsInRun);
|
|
|
|
return origSize == intersectionSize;
|
|
}
|
|
|
|
bool
|
|
gfxFont::HasFeatureSet(uint32_t aFeature, bool& aFeatureOn)
|
|
{
|
|
aFeatureOn = false;
|
|
|
|
if (mStyle.featureSettings.IsEmpty() &&
|
|
GetFontEntry()->mFeatureSettings.IsEmpty()) {
|
|
return false;
|
|
}
|
|
|
|
// add feature values from font
|
|
bool featureSet = false;
|
|
uint32_t i, count;
|
|
|
|
nsTArray<gfxFontFeature>& fontFeatures = GetFontEntry()->mFeatureSettings;
|
|
count = fontFeatures.Length();
|
|
for (i = 0; i < count; i++) {
|
|
const gfxFontFeature& feature = fontFeatures.ElementAt(i);
|
|
if (feature.mTag == aFeature) {
|
|
featureSet = true;
|
|
aFeatureOn = (feature.mValue != 0);
|
|
}
|
|
}
|
|
|
|
// add feature values from style rules
|
|
nsTArray<gfxFontFeature>& styleFeatures = mStyle.featureSettings;
|
|
count = styleFeatures.Length();
|
|
for (i = 0; i < count; i++) {
|
|
const gfxFontFeature& feature = styleFeatures.ElementAt(i);
|
|
if (feature.mTag == aFeature) {
|
|
featureSet = true;
|
|
aFeatureOn = (feature.mValue != 0);
|
|
}
|
|
}
|
|
|
|
return featureSet;
|
|
}
|
|
|
|
/**
|
|
* A helper function in case we need to do any rounding or other
|
|
* processing here.
|
|
*/
|
|
#define ToDeviceUnits(aAppUnits, aDevUnitsPerAppUnit) \
|
|
(double(aAppUnits)*double(aDevUnitsPerAppUnit))
|
|
|
|
static AntialiasMode Get2DAAMode(gfxFont::AntialiasOption aAAOption) {
|
|
switch (aAAOption) {
|
|
case gfxFont::kAntialiasSubpixel:
|
|
return AntialiasMode::SUBPIXEL;
|
|
case gfxFont::kAntialiasGrayscale:
|
|
return AntialiasMode::GRAY;
|
|
case gfxFont::kAntialiasNone:
|
|
return AntialiasMode::NONE;
|
|
default:
|
|
return AntialiasMode::DEFAULT;
|
|
}
|
|
}
|
|
|
|
class GlyphBufferAzure
|
|
{
|
|
public:
|
|
GlyphBufferAzure(const TextRunDrawParams& aRunParams,
|
|
const FontDrawParams& aFontParams)
|
|
: mRunParams(aRunParams)
|
|
, mFontParams(aFontParams)
|
|
, mNumGlyphs(0)
|
|
{
|
|
}
|
|
|
|
~GlyphBufferAzure()
|
|
{
|
|
Flush(true); // flush any remaining buffered glyphs
|
|
}
|
|
|
|
void OutputGlyph(uint32_t aGlyphID, const gfxPoint& aPt)
|
|
{
|
|
Glyph *glyph = AppendGlyph();
|
|
glyph->mIndex = aGlyphID;
|
|
glyph->mPosition.x = aPt.x;
|
|
glyph->mPosition.y = aPt.y;
|
|
glyph->mPosition = mFontParams.matInv.TransformPoint(glyph->mPosition);
|
|
Flush(false); // this will flush only if the buffer is full
|
|
}
|
|
|
|
const TextRunDrawParams& mRunParams;
|
|
const FontDrawParams& mFontParams;
|
|
|
|
private:
|
|
#define GLYPH_BUFFER_SIZE (2048/sizeof(Glyph))
|
|
|
|
Glyph *AppendGlyph()
|
|
{
|
|
return &mGlyphBuffer[mNumGlyphs++];
|
|
}
|
|
|
|
static DrawMode
|
|
GetStrokeMode(DrawMode aMode)
|
|
{
|
|
return aMode & (DrawMode::GLYPH_STROKE |
|
|
DrawMode::GLYPH_STROKE_UNDERNEATH);
|
|
}
|
|
|
|
// Render the buffered glyphs to the draw target and clear the buffer.
|
|
// This actually flushes the glyphs only if the buffer is full, or if the
|
|
// aFinish parameter is true; otherwise it simply returns.
|
|
void Flush(bool aFinish)
|
|
{
|
|
// Ensure there's enough room for a glyph to be added to the buffer
|
|
if ((!aFinish && mNumGlyphs < GLYPH_BUFFER_SIZE) || !mNumGlyphs) {
|
|
return;
|
|
}
|
|
|
|
if (mRunParams.isRTL) {
|
|
Glyph *begin = &mGlyphBuffer[0];
|
|
Glyph *end = &mGlyphBuffer[mNumGlyphs];
|
|
std::reverse(begin, end);
|
|
}
|
|
|
|
gfx::GlyphBuffer buf;
|
|
buf.mGlyphs = mGlyphBuffer;
|
|
buf.mNumGlyphs = mNumGlyphs;
|
|
|
|
gfxContext::AzureState state = mRunParams.context->CurrentState();
|
|
if (mRunParams.drawMode & DrawMode::GLYPH_FILL) {
|
|
if (state.pattern || mFontParams.contextPaint) {
|
|
Pattern *pat;
|
|
|
|
RefPtr<gfxPattern> fillPattern;
|
|
if (!mFontParams.contextPaint ||
|
|
!(fillPattern = mFontParams.contextPaint->GetFillPattern(
|
|
mRunParams.context->GetDrawTarget(),
|
|
mRunParams.context->CurrentMatrix()))) {
|
|
if (state.pattern) {
|
|
pat = state.pattern->GetPattern(mRunParams.dt,
|
|
state.patternTransformChanged ?
|
|
&state.patternTransform : nullptr);
|
|
} else {
|
|
pat = nullptr;
|
|
}
|
|
} else {
|
|
pat = fillPattern->GetPattern(mRunParams.dt);
|
|
}
|
|
|
|
if (pat) {
|
|
Matrix saved;
|
|
Matrix *mat = nullptr;
|
|
if (mFontParams.passedInvMatrix) {
|
|
// The brush matrix needs to be multiplied with the
|
|
// inverted matrix as well, to move the brush into the
|
|
// space of the glyphs.
|
|
|
|
// This relies on the returned Pattern not to be reused
|
|
// by others, but regenerated on GetPattern calls. This
|
|
// is true!
|
|
if (pat->GetType() == PatternType::LINEAR_GRADIENT) {
|
|
mat = &static_cast<LinearGradientPattern*>(pat)->mMatrix;
|
|
} else if (pat->GetType() == PatternType::RADIAL_GRADIENT) {
|
|
mat = &static_cast<RadialGradientPattern*>(pat)->mMatrix;
|
|
} else if (pat->GetType() == PatternType::SURFACE) {
|
|
mat = &static_cast<SurfacePattern*>(pat)->mMatrix;
|
|
}
|
|
|
|
if (mat) {
|
|
saved = *mat;
|
|
*mat = (*mat) * (*mFontParams.passedInvMatrix);
|
|
}
|
|
}
|
|
|
|
mRunParams.dt->FillGlyphs(mFontParams.scaledFont, buf,
|
|
*pat, mFontParams.drawOptions,
|
|
mFontParams.renderingOptions);
|
|
|
|
if (mat) {
|
|
*mat = saved;
|
|
}
|
|
}
|
|
} else if (state.sourceSurface) {
|
|
mRunParams.dt->FillGlyphs(mFontParams.scaledFont, buf,
|
|
SurfacePattern(state.sourceSurface,
|
|
ExtendMode::CLAMP,
|
|
state.surfTransform),
|
|
mFontParams.drawOptions,
|
|
mFontParams.renderingOptions);
|
|
} else {
|
|
mRunParams.dt->FillGlyphs(mFontParams.scaledFont, buf,
|
|
ColorPattern(state.color),
|
|
mFontParams.drawOptions,
|
|
mFontParams.renderingOptions);
|
|
}
|
|
}
|
|
if (GetStrokeMode(mRunParams.drawMode) == DrawMode::GLYPH_STROKE &&
|
|
mRunParams.strokeOpts) {
|
|
Pattern *pat;
|
|
if (mRunParams.textStrokePattern) {
|
|
pat = mRunParams.textStrokePattern->GetPattern(
|
|
mRunParams.dt, state.patternTransformChanged
|
|
? &state.patternTransform
|
|
: nullptr);
|
|
|
|
if (pat) {
|
|
Matrix saved;
|
|
Matrix *mat = nullptr;
|
|
if (mFontParams.passedInvMatrix) {
|
|
// The brush matrix needs to be multiplied with the
|
|
// inverted matrix as well, to move the brush into the
|
|
// space of the glyphs.
|
|
|
|
// This relies on the returned Pattern not to be reused
|
|
// by others, but regenerated on GetPattern calls. This
|
|
// is true!
|
|
if (pat->GetType() == PatternType::LINEAR_GRADIENT) {
|
|
mat = &static_cast<LinearGradientPattern*>(pat)->mMatrix;
|
|
} else if (pat->GetType() == PatternType::RADIAL_GRADIENT) {
|
|
mat = &static_cast<RadialGradientPattern*>(pat)->mMatrix;
|
|
} else if (pat->GetType() == PatternType::SURFACE) {
|
|
mat = &static_cast<SurfacePattern*>(pat)->mMatrix;
|
|
}
|
|
|
|
if (mat) {
|
|
saved = *mat;
|
|
*mat = (*mat) * (*mFontParams.passedInvMatrix);
|
|
}
|
|
}
|
|
FlushStroke(buf, *pat);
|
|
|
|
if (mat) {
|
|
*mat = saved;
|
|
}
|
|
}
|
|
} else {
|
|
FlushStroke(buf,
|
|
ColorPattern(
|
|
Color::FromABGR(mRunParams.textStrokeColor)));
|
|
}
|
|
}
|
|
if (mRunParams.drawMode & DrawMode::GLYPH_PATH) {
|
|
mRunParams.context->EnsurePathBuilder();
|
|
Matrix mat = mRunParams.dt->GetTransform();
|
|
mFontParams.scaledFont->CopyGlyphsToBuilder(
|
|
buf, mRunParams.context->mPathBuilder, &mat);
|
|
}
|
|
|
|
mNumGlyphs = 0;
|
|
}
|
|
|
|
void FlushStroke(gfx::GlyphBuffer& aBuf, const Pattern& aPattern)
|
|
{
|
|
RefPtr<Path> path =
|
|
mFontParams.scaledFont->GetPathForGlyphs(aBuf, mRunParams.dt);
|
|
mRunParams.dt->Stroke(path, aPattern, *mRunParams.strokeOpts,
|
|
(mRunParams.drawOpts) ? *mRunParams.drawOpts
|
|
: DrawOptions());
|
|
}
|
|
|
|
Glyph mGlyphBuffer[GLYPH_BUFFER_SIZE];
|
|
unsigned int mNumGlyphs;
|
|
|
|
#undef GLYPH_BUFFER_SIZE
|
|
};
|
|
|
|
// Bug 674909. When synthetic bolding text by drawing twice, need to
|
|
// render using a pixel offset in device pixels, otherwise text
|
|
// doesn't appear bolded, it appears as if a bad text shadow exists
|
|
// when a non-identity transform exists. Use an offset factor so that
|
|
// the second draw occurs at a constant offset in device pixels.
|
|
|
|
double
|
|
gfxFont::CalcXScale(DrawTarget* aDrawTarget)
|
|
{
|
|
// determine magnitude of a 1px x offset in device space
|
|
Size t = aDrawTarget->GetTransform().TransformSize(Size(1.0, 0.0));
|
|
if (t.width == 1.0 && t.height == 0.0) {
|
|
// short-circuit the most common case to avoid sqrt() and division
|
|
return 1.0;
|
|
}
|
|
|
|
double m = sqrt(t.width * t.width + t.height * t.height);
|
|
|
|
NS_ASSERTION(m != 0.0, "degenerate transform while synthetic bolding");
|
|
if (m == 0.0) {
|
|
return 0.0; // effectively disables offset
|
|
}
|
|
|
|
// scale factor so that offsets are 1px in device pixels
|
|
return 1.0 / m;
|
|
}
|
|
|
|
// Draw an individual glyph at a specific location.
|
|
// *aPt is the glyph position in appUnits; it is converted to device
|
|
// coordinates (devPt) here.
|
|
void
|
|
gfxFont::DrawOneGlyph(uint32_t aGlyphID, double aAdvance, gfxPoint *aPt,
|
|
GlyphBufferAzure& aBuffer, bool *aEmittedGlyphs) const
|
|
{
|
|
const TextRunDrawParams& runParams(aBuffer.mRunParams);
|
|
const FontDrawParams& fontParams(aBuffer.mFontParams);
|
|
|
|
double glyphX, glyphY;
|
|
if (fontParams.isVerticalFont) {
|
|
glyphX = aPt->x;
|
|
if (runParams.isRTL) {
|
|
aPt->y -= aAdvance;
|
|
glyphY = aPt->y;
|
|
} else {
|
|
glyphY = aPt->y;
|
|
aPt->y += aAdvance;
|
|
}
|
|
} else {
|
|
glyphY = aPt->y;
|
|
if (runParams.isRTL) {
|
|
aPt->x -= aAdvance;
|
|
glyphX = aPt->x;
|
|
} else {
|
|
glyphX = aPt->x;
|
|
aPt->x += aAdvance;
|
|
}
|
|
}
|
|
gfxPoint devPt(ToDeviceUnits(glyphX, runParams.devPerApp),
|
|
ToDeviceUnits(glyphY, runParams.devPerApp));
|
|
|
|
if (fontParams.haveSVGGlyphs) {
|
|
if (!runParams.paintSVGGlyphs) {
|
|
return;
|
|
}
|
|
NS_WARNING_ASSERTION(
|
|
runParams.drawMode != DrawMode::GLYPH_PATH,
|
|
"Rendering SVG glyph despite request for glyph path");
|
|
if (RenderSVGGlyph(runParams.context, devPt,
|
|
aGlyphID, fontParams.contextPaint,
|
|
runParams.callbacks, *aEmittedGlyphs)) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (fontParams.haveColorGlyphs &&
|
|
RenderColorGlyph(runParams.dt, runParams.context,
|
|
fontParams.scaledFont, fontParams.renderingOptions,
|
|
fontParams.drawOptions,
|
|
fontParams.matInv.TransformPoint(gfx::Point(devPt.x, devPt.y)),
|
|
aGlyphID)) {
|
|
return;
|
|
}
|
|
|
|
aBuffer.OutputGlyph(aGlyphID, devPt);
|
|
|
|
// Synthetic bolding (if required) by multi-striking.
|
|
for (int32_t i = 0; i < fontParams.extraStrikes; ++i) {
|
|
if (fontParams.isVerticalFont) {
|
|
devPt.y += fontParams.synBoldOnePixelOffset;
|
|
} else {
|
|
devPt.x += fontParams.synBoldOnePixelOffset;
|
|
}
|
|
aBuffer.OutputGlyph(aGlyphID, devPt);
|
|
}
|
|
|
|
*aEmittedGlyphs = true;
|
|
}
|
|
|
|
// Draw a run of CharacterGlyph records from the given offset in aShapedText.
|
|
// Returns true if glyph paths were actually emitted.
|
|
bool
|
|
gfxFont::DrawGlyphs(const gfxShapedText *aShapedText,
|
|
uint32_t aOffset, // offset in the textrun
|
|
uint32_t aCount, // length of run to draw
|
|
gfxPoint *aPt,
|
|
const TextRunDrawParams& aRunParams,
|
|
const FontDrawParams& aFontParams)
|
|
{
|
|
bool emittedGlyphs = false;
|
|
GlyphBufferAzure buffer(aRunParams, aFontParams);
|
|
|
|
gfxFloat& inlineCoord = aFontParams.isVerticalFont ? aPt->y : aPt->x;
|
|
|
|
if (aRunParams.spacing) {
|
|
inlineCoord += aRunParams.isRTL ? -aRunParams.spacing[0].mBefore
|
|
: aRunParams.spacing[0].mBefore;
|
|
}
|
|
|
|
const gfxShapedText::CompressedGlyph *glyphData =
|
|
&aShapedText->GetCharacterGlyphs()[aOffset];
|
|
|
|
for (uint32_t i = 0; i < aCount; ++i, ++glyphData) {
|
|
if (glyphData->IsSimpleGlyph()) {
|
|
DrawOneGlyph(glyphData->GetSimpleGlyph(),
|
|
glyphData->GetSimpleAdvance(),
|
|
aPt, buffer, &emittedGlyphs);
|
|
} else {
|
|
uint32_t glyphCount = glyphData->GetGlyphCount();
|
|
if (glyphCount > 0) {
|
|
const gfxShapedText::DetailedGlyph *details =
|
|
aShapedText->GetDetailedGlyphs(aOffset + i);
|
|
NS_ASSERTION(details, "detailedGlyph should not be missing!");
|
|
for (uint32_t j = 0; j < glyphCount; ++j, ++details) {
|
|
double advance = details->mAdvance;
|
|
|
|
if (glyphData->IsMissing()) {
|
|
// Default-ignorable chars will have zero advance width;
|
|
// we don't have to draw the hexbox for them.
|
|
if (aRunParams.drawMode != DrawMode::GLYPH_PATH &&
|
|
advance > 0) {
|
|
double glyphX = aPt->x;
|
|
double glyphY = aPt->y;
|
|
if (aRunParams.isRTL) {
|
|
if (aFontParams.isVerticalFont) {
|
|
glyphY -= advance;
|
|
} else {
|
|
glyphX -= advance;
|
|
}
|
|
}
|
|
Point pt(Float(ToDeviceUnits(glyphX, aRunParams.devPerApp)),
|
|
Float(ToDeviceUnits(glyphY, aRunParams.devPerApp)));
|
|
Float advanceDevUnits =
|
|
Float(ToDeviceUnits(advance, aRunParams.devPerApp));
|
|
Float height = GetMetrics(eHorizontal).maxAscent;
|
|
Rect glyphRect = aFontParams.isVerticalFont ?
|
|
Rect(pt.x - height / 2, pt.y,
|
|
height, advanceDevUnits) :
|
|
Rect(pt.x, pt.y - height,
|
|
advanceDevUnits, height);
|
|
|
|
// If there's a fake-italic skew in effect as part
|
|
// of the drawTarget's transform, we need to remove
|
|
// this before drawing the hexbox. (Bug 983985)
|
|
Matrix oldMat;
|
|
if (aFontParams.passedInvMatrix) {
|
|
oldMat = aRunParams.dt->GetTransform();
|
|
aRunParams.dt->SetTransform(
|
|
*aFontParams.passedInvMatrix * oldMat);
|
|
}
|
|
|
|
gfxFontMissingGlyphs::DrawMissingGlyph(
|
|
details->mGlyphID, glyphRect, *aRunParams.dt,
|
|
PatternFromState(aRunParams.context),
|
|
aShapedText->GetAppUnitsPerDevUnit());
|
|
|
|
// Restore the matrix, if we modified it before
|
|
// drawing the hexbox.
|
|
if (aFontParams.passedInvMatrix) {
|
|
aRunParams.dt->SetTransform(oldMat);
|
|
}
|
|
}
|
|
} else {
|
|
gfxPoint glyphXY(*aPt);
|
|
if (aFontParams.isVerticalFont) {
|
|
glyphXY.x += details->mYOffset;
|
|
glyphXY.y += details->mXOffset;
|
|
} else {
|
|
glyphXY.x += details->mXOffset;
|
|
glyphXY.y += details->mYOffset;
|
|
}
|
|
DrawOneGlyph(details->mGlyphID, advance, &glyphXY,
|
|
buffer, &emittedGlyphs);
|
|
}
|
|
|
|
inlineCoord += aRunParams.isRTL ? -advance : advance;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (aRunParams.spacing) {
|
|
double space = aRunParams.spacing[i].mAfter;
|
|
if (i + 1 < aCount) {
|
|
space += aRunParams.spacing[i + 1].mBefore;
|
|
}
|
|
inlineCoord += aRunParams.isRTL ? -space : space;
|
|
}
|
|
}
|
|
|
|
return emittedGlyphs;
|
|
}
|
|
|
|
// This method is mostly parallel to DrawGlyphs.
|
|
void
|
|
gfxFont::DrawEmphasisMarks(const gfxTextRun* aShapedText, gfxPoint* aPt,
|
|
uint32_t aOffset, uint32_t aCount,
|
|
const EmphasisMarkDrawParams& aParams)
|
|
{
|
|
gfxFloat& inlineCoord = aParams.isVertical ? aPt->y : aPt->x;
|
|
gfxTextRun::Range markRange(aParams.mark);
|
|
gfxTextRun::DrawParams params(aParams.context);
|
|
|
|
gfxFloat clusterStart = -std::numeric_limits<gfxFloat>::infinity();
|
|
bool shouldDrawEmphasisMark = false;
|
|
for (uint32_t i = 0, idx = aOffset; i < aCount; ++i, ++idx) {
|
|
if (aParams.spacing) {
|
|
inlineCoord += aParams.direction * aParams.spacing[i].mBefore;
|
|
}
|
|
if (aShapedText->IsClusterStart(idx) ||
|
|
clusterStart == -std::numeric_limits<gfxFloat>::infinity()) {
|
|
clusterStart = inlineCoord;
|
|
}
|
|
if (aShapedText->CharMayHaveEmphasisMark(idx)) {
|
|
shouldDrawEmphasisMark = true;
|
|
}
|
|
inlineCoord += aParams.direction * aShapedText->GetAdvanceForGlyph(idx);
|
|
if (shouldDrawEmphasisMark &&
|
|
(i + 1 == aCount || aShapedText->IsClusterStart(idx + 1))) {
|
|
gfxFloat clusterAdvance = inlineCoord - clusterStart;
|
|
// Move the coord backward to get the needed start point.
|
|
gfxFloat delta = (clusterAdvance + aParams.advance) / 2;
|
|
inlineCoord -= delta;
|
|
aParams.mark->Draw(markRange, *aPt, params);
|
|
inlineCoord += delta;
|
|
shouldDrawEmphasisMark = false;
|
|
}
|
|
if (aParams.spacing) {
|
|
inlineCoord += aParams.direction * aParams.spacing[i].mAfter;
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
gfxFont::Draw(const gfxTextRun *aTextRun, uint32_t aStart, uint32_t aEnd,
|
|
gfxPoint *aPt, const TextRunDrawParams& aRunParams,
|
|
uint16_t aOrientation)
|
|
{
|
|
NS_ASSERTION(aRunParams.drawMode == DrawMode::GLYPH_PATH ||
|
|
!(int(aRunParams.drawMode) & int(DrawMode::GLYPH_PATH)),
|
|
"GLYPH_PATH cannot be used with GLYPH_FILL, GLYPH_STROKE or GLYPH_STROKE_UNDERNEATH");
|
|
|
|
if (aStart >= aEnd) {
|
|
return;
|
|
}
|
|
|
|
FontDrawParams fontParams;
|
|
|
|
if (aRunParams.drawOpts) {
|
|
fontParams.drawOptions = *aRunParams.drawOpts;
|
|
}
|
|
|
|
fontParams.scaledFont = GetScaledFont(aRunParams.dt);
|
|
if (!fontParams.scaledFont) {
|
|
return;
|
|
}
|
|
|
|
fontParams.haveSVGGlyphs = GetFontEntry()->TryGetSVGData(this);
|
|
fontParams.haveColorGlyphs = GetFontEntry()->TryGetColorGlyphs();
|
|
fontParams.contextPaint = aRunParams.runContextPaint;
|
|
fontParams.isVerticalFont =
|
|
aOrientation == gfxTextRunFactory::TEXT_ORIENT_VERTICAL_UPRIGHT;
|
|
|
|
bool sideways = false;
|
|
gfxPoint origPt = *aPt;
|
|
if (aRunParams.isVerticalRun && !fontParams.isVerticalFont) {
|
|
sideways = true;
|
|
aRunParams.context->Save();
|
|
gfxPoint p(aPt->x * aRunParams.devPerApp,
|
|
aPt->y * aRunParams.devPerApp);
|
|
const Metrics& metrics = GetMetrics(eHorizontal);
|
|
// Get a matrix we can use to draw the (horizontally-shaped) textrun
|
|
// with 90-degree CW rotation.
|
|
const gfxFloat
|
|
rotation = (aOrientation ==
|
|
gfxTextRunFactory::TEXT_ORIENT_VERTICAL_SIDEWAYS_LEFT)
|
|
? -M_PI / 2.0 : M_PI / 2.0;
|
|
gfxMatrix mat =
|
|
aRunParams.context->CurrentMatrix().
|
|
Translate(p). // translate origin for rotation
|
|
Rotate(rotation). // turn 90deg CCW (sideways-left) or CW (*-right)
|
|
Translate(-p); // undo the translation
|
|
|
|
// If we're drawing rotated horizontal text for an element styled
|
|
// text-orientation:mixed, the dominant baseline will be vertical-
|
|
// centered. So in this case, we need to adjust the position so that
|
|
// the rotated horizontal text (which uses an alphabetic baseline) will
|
|
// look OK when juxtaposed with upright glyphs (rendered on a centered
|
|
// vertical baseline). The adjustment here is somewhat ad hoc; we
|
|
// should eventually look for baseline tables[1] in the fonts and use
|
|
// those if available.
|
|
// [1] See http://www.microsoft.com/typography/otspec/base.htm
|
|
if (aTextRun->UseCenterBaseline()) {
|
|
gfxPoint baseAdj(0, (metrics.emAscent - metrics.emDescent) / 2);
|
|
mat.Translate(baseAdj);
|
|
}
|
|
|
|
aRunParams.context->SetMatrix(mat);
|
|
}
|
|
|
|
UniquePtr<SVGContextPaint> contextPaint;
|
|
if (fontParams.haveSVGGlyphs && !fontParams.contextPaint) {
|
|
// If no pattern is specified for fill, use the current pattern
|
|
NS_ASSERTION((int(aRunParams.drawMode) & int(DrawMode::GLYPH_STROKE)) == 0,
|
|
"no pattern supplied for stroking text");
|
|
RefPtr<gfxPattern> fillPattern = aRunParams.context->GetPattern();
|
|
contextPaint.reset(
|
|
new SimpleTextContextPaint(fillPattern, nullptr,
|
|
aRunParams.context->CurrentMatrix()));
|
|
fontParams.contextPaint = contextPaint.get();
|
|
}
|
|
|
|
// Synthetic-bold strikes are each offset one device pixel in run direction.
|
|
// (these values are only needed if IsSyntheticBold() is true)
|
|
if (IsSyntheticBold()) {
|
|
double xscale = CalcXScale(aRunParams.context->GetDrawTarget());
|
|
fontParams.synBoldOnePixelOffset = aRunParams.direction * xscale;
|
|
if (xscale != 0.0) {
|
|
// use as many strikes as needed for the the increased advance
|
|
fontParams.extraStrikes =
|
|
std::max(1, NS_lroundf(GetSyntheticBoldOffset() / xscale));
|
|
}
|
|
} else {
|
|
fontParams.synBoldOnePixelOffset = 0;
|
|
fontParams.extraStrikes = 0;
|
|
}
|
|
|
|
bool oldSubpixelAA = aRunParams.dt->GetPermitSubpixelAA();
|
|
if (!AllowSubpixelAA()) {
|
|
aRunParams.dt->SetPermitSubpixelAA(false);
|
|
}
|
|
|
|
Matrix mat;
|
|
Matrix oldMat = aRunParams.dt->GetTransform();
|
|
|
|
// This is nullptr when we have inverse-transformed glyphs and we need
|
|
// to transform the Brush inside flush.
|
|
fontParams.passedInvMatrix = nullptr;
|
|
|
|
fontParams.renderingOptions = GetGlyphRenderingOptions(&aRunParams);
|
|
fontParams.drawOptions.mAntialiasMode = Get2DAAMode(mAntialiasOption);
|
|
|
|
// The cairo DrawTarget backend uses the cairo_scaled_font directly
|
|
// and so has the font skew matrix applied already.
|
|
if (mScaledFont &&
|
|
aRunParams.dt->GetBackendType() != BackendType::CAIRO) {
|
|
cairo_matrix_t matrix;
|
|
cairo_scaled_font_get_font_matrix(mScaledFont, &matrix);
|
|
if (matrix.xy != 0) {
|
|
// If this matrix applies a skew, which can happen when drawing
|
|
// oblique fonts, we will set the DrawTarget matrix to apply the
|
|
// skew. We'll need to move the glyphs by the inverse of the skew to
|
|
// get the glyphs positioned correctly in the new device space
|
|
// though, since the font matrix should only be applied to drawing
|
|
// the glyphs, and not to their position.
|
|
mat = Matrix(matrix.xx, matrix.yx,
|
|
matrix.xy, matrix.yy,
|
|
matrix.x0, matrix.y0);
|
|
|
|
mat._11 = mat._22 = 1.0;
|
|
mat._21 /= GetAdjustedSize();
|
|
|
|
aRunParams.dt->SetTransform(mat * oldMat);
|
|
|
|
fontParams.matInv = mat;
|
|
fontParams.matInv.Invert();
|
|
|
|
fontParams.passedInvMatrix = &fontParams.matInv;
|
|
}
|
|
}
|
|
|
|
gfxFloat& baseline = fontParams.isVerticalFont ? aPt->x : aPt->y;
|
|
gfxFloat origBaseline = baseline;
|
|
if (mStyle.baselineOffset != 0.0) {
|
|
baseline +=
|
|
mStyle.baselineOffset * aTextRun->GetAppUnitsPerDevUnit();
|
|
}
|
|
|
|
bool emittedGlyphs =
|
|
DrawGlyphs(aTextRun, aStart, aEnd - aStart, aPt,
|
|
aRunParams, fontParams);
|
|
|
|
baseline = origBaseline;
|
|
|
|
if (aRunParams.callbacks && emittedGlyphs) {
|
|
aRunParams.callbacks->NotifyGlyphPathEmitted();
|
|
}
|
|
|
|
aRunParams.dt->SetTransform(oldMat);
|
|
aRunParams.dt->SetPermitSubpixelAA(oldSubpixelAA);
|
|
|
|
if (sideways) {
|
|
aRunParams.context->Restore();
|
|
// adjust updated aPt to account for the transform we were using
|
|
gfxFloat advance = aPt->x - origPt.x;
|
|
if (aOrientation ==
|
|
gfxTextRunFactory::TEXT_ORIENT_VERTICAL_SIDEWAYS_LEFT) {
|
|
*aPt = gfxPoint(origPt.x, origPt.y - advance);
|
|
} else {
|
|
*aPt = gfxPoint(origPt.x, origPt.y + advance);
|
|
}
|
|
}
|
|
}
|
|
|
|
bool
|
|
gfxFont::RenderSVGGlyph(gfxContext *aContext, gfxPoint aPoint,
|
|
uint32_t aGlyphId, SVGContextPaint* aContextPaint) const
|
|
{
|
|
if (!GetFontEntry()->HasSVGGlyph(aGlyphId)) {
|
|
return false;
|
|
}
|
|
|
|
const gfxFloat devUnitsPerSVGUnit =
|
|
GetAdjustedSize() / GetFontEntry()->UnitsPerEm();
|
|
gfxContextMatrixAutoSaveRestore matrixRestore(aContext);
|
|
|
|
aContext->Save();
|
|
aContext->SetMatrix(
|
|
aContext->CurrentMatrix().Translate(aPoint.x, aPoint.y).
|
|
Scale(devUnitsPerSVGUnit, devUnitsPerSVGUnit));
|
|
|
|
aContextPaint->InitStrokeGeometry(aContext, devUnitsPerSVGUnit);
|
|
|
|
bool rv = GetFontEntry()->RenderSVGGlyph(aContext, aGlyphId,
|
|
aContextPaint);
|
|
aContext->Restore();
|
|
aContext->NewPath();
|
|
return rv;
|
|
}
|
|
|
|
bool
|
|
gfxFont::RenderSVGGlyph(gfxContext *aContext, gfxPoint aPoint,
|
|
uint32_t aGlyphId, SVGContextPaint* aContextPaint,
|
|
gfxTextRunDrawCallbacks *aCallbacks,
|
|
bool& aEmittedGlyphs) const
|
|
{
|
|
if (aCallbacks && aEmittedGlyphs) {
|
|
aCallbacks->NotifyGlyphPathEmitted();
|
|
aEmittedGlyphs = false;
|
|
}
|
|
return RenderSVGGlyph(aContext, aPoint, aGlyphId, aContextPaint);
|
|
}
|
|
|
|
bool
|
|
gfxFont::RenderColorGlyph(DrawTarget* aDrawTarget,
|
|
gfxContext* aContext,
|
|
mozilla::gfx::ScaledFont* scaledFont,
|
|
GlyphRenderingOptions* aRenderingOptions,
|
|
mozilla::gfx::DrawOptions aDrawOptions,
|
|
const mozilla::gfx::Point& aPoint,
|
|
uint32_t aGlyphId) const
|
|
{
|
|
AutoTArray<uint16_t, 8> layerGlyphs;
|
|
AutoTArray<mozilla::gfx::Color, 8> layerColors;
|
|
|
|
mozilla::gfx::Color defaultColor;
|
|
if (!aContext->GetDeviceColor(defaultColor)) {
|
|
defaultColor = mozilla::gfx::Color(0, 0, 0);
|
|
}
|
|
if (!GetFontEntry()->GetColorLayersInfo(aGlyphId, defaultColor,
|
|
layerGlyphs, layerColors)) {
|
|
return false;
|
|
}
|
|
|
|
for (uint32_t layerIndex = 0; layerIndex < layerGlyphs.Length();
|
|
layerIndex++) {
|
|
Glyph glyph;
|
|
glyph.mIndex = layerGlyphs[layerIndex];
|
|
glyph.mPosition = aPoint;
|
|
|
|
mozilla::gfx::GlyphBuffer buffer;
|
|
buffer.mGlyphs = &glyph;
|
|
buffer.mNumGlyphs = 1;
|
|
|
|
aDrawTarget->FillGlyphs(scaledFont, buffer,
|
|
ColorPattern(layerColors[layerIndex]),
|
|
aDrawOptions, aRenderingOptions);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static void
|
|
UnionRange(gfxFloat aX, gfxFloat* aDestMin, gfxFloat* aDestMax)
|
|
{
|
|
*aDestMin = std::min(*aDestMin, aX);
|
|
*aDestMax = std::max(*aDestMax, aX);
|
|
}
|
|
|
|
// We get precise glyph extents if the textrun creator requested them, or
|
|
// if the font is a user font --- in which case the author may be relying
|
|
// on overflowing glyphs.
|
|
static bool
|
|
NeedsGlyphExtents(gfxFont *aFont, const gfxTextRun *aTextRun)
|
|
{
|
|
return (aTextRun->GetFlags() & gfxTextRunFactory::TEXT_NEED_BOUNDING_BOX) ||
|
|
aFont->GetFontEntry()->IsUserFont();
|
|
}
|
|
|
|
bool
|
|
gfxFont::IsSpaceGlyphInvisible(DrawTarget* aRefDrawTarget,
|
|
const gfxTextRun* aTextRun)
|
|
{
|
|
if (!mFontEntry->mSpaceGlyphIsInvisibleInitialized &&
|
|
GetAdjustedSize() >= 1.0) {
|
|
gfxGlyphExtents *extents =
|
|
GetOrCreateGlyphExtents(aTextRun->GetAppUnitsPerDevUnit());
|
|
gfxRect glyphExtents;
|
|
mFontEntry->mSpaceGlyphIsInvisible =
|
|
extents->GetTightGlyphExtentsAppUnits(this, aRefDrawTarget,
|
|
GetSpaceGlyph(), &glyphExtents) &&
|
|
glyphExtents.IsEmpty();
|
|
mFontEntry->mSpaceGlyphIsInvisibleInitialized = true;
|
|
}
|
|
return mFontEntry->mSpaceGlyphIsInvisible;
|
|
}
|
|
|
|
gfxFont::RunMetrics
|
|
gfxFont::Measure(const gfxTextRun *aTextRun,
|
|
uint32_t aStart, uint32_t aEnd,
|
|
BoundingBoxType aBoundingBoxType,
|
|
DrawTarget* aRefDrawTarget,
|
|
Spacing *aSpacing,
|
|
uint16_t aOrientation)
|
|
{
|
|
// If aBoundingBoxType is TIGHT_HINTED_OUTLINE_EXTENTS
|
|
// and the underlying cairo font may be antialiased,
|
|
// we need to create a copy in order to avoid getting cached extents.
|
|
// This is only used by MathML layout at present.
|
|
if (aBoundingBoxType == TIGHT_HINTED_OUTLINE_EXTENTS &&
|
|
mAntialiasOption != kAntialiasNone) {
|
|
if (!mNonAAFont) {
|
|
mNonAAFont.reset(CopyWithAntialiasOption(kAntialiasNone));
|
|
}
|
|
// if font subclass doesn't implement CopyWithAntialiasOption(),
|
|
// it will return null and we'll proceed to use the existing font
|
|
if (mNonAAFont) {
|
|
return mNonAAFont->Measure(aTextRun, aStart, aEnd,
|
|
TIGHT_HINTED_OUTLINE_EXTENTS,
|
|
aRefDrawTarget, aSpacing, aOrientation);
|
|
}
|
|
}
|
|
|
|
const int32_t appUnitsPerDevUnit = aTextRun->GetAppUnitsPerDevUnit();
|
|
// Current position in appunits
|
|
gfxFont::Orientation orientation =
|
|
aOrientation == gfxTextRunFactory::TEXT_ORIENT_VERTICAL_UPRIGHT
|
|
? eVertical : eHorizontal;
|
|
const gfxFont::Metrics& fontMetrics = GetMetrics(orientation);
|
|
|
|
gfxFloat baselineOffset = 0;
|
|
if (aTextRun->UseCenterBaseline() && orientation == eHorizontal) {
|
|
// For a horizontal font being used in vertical writing mode with
|
|
// text-orientation:mixed, the overall metrics we're accumulating
|
|
// will be aimed at a center baseline. But this font's metrics were
|
|
// based on the alphabetic baseline. So we compute a baseline offset
|
|
// that will be applied to ascent/descent values and glyph rects
|
|
// to effectively shift them relative to the baseline.
|
|
// XXX Eventually we should probably use the BASE table, if present.
|
|
// But it usually isn't, so we need an ad hoc adjustment for now.
|
|
baselineOffset = appUnitsPerDevUnit *
|
|
(fontMetrics.emAscent - fontMetrics.emDescent) / 2;
|
|
}
|
|
|
|
RunMetrics metrics;
|
|
metrics.mAscent = fontMetrics.maxAscent * appUnitsPerDevUnit;
|
|
metrics.mDescent = fontMetrics.maxDescent * appUnitsPerDevUnit;
|
|
|
|
if (aStart == aEnd) {
|
|
// exit now before we look at aSpacing[0], which is undefined
|
|
metrics.mAscent -= baselineOffset;
|
|
metrics.mDescent += baselineOffset;
|
|
metrics.mBoundingBox = gfxRect(0, -metrics.mAscent,
|
|
0, metrics.mAscent + metrics.mDescent);
|
|
return metrics;
|
|
}
|
|
|
|
gfxFloat advanceMin = 0, advanceMax = 0;
|
|
const gfxTextRun::CompressedGlyph *charGlyphs = aTextRun->GetCharacterGlyphs();
|
|
bool isRTL = aTextRun->IsRightToLeft();
|
|
double direction = aTextRun->GetDirection();
|
|
bool needsGlyphExtents = NeedsGlyphExtents(this, aTextRun);
|
|
gfxGlyphExtents *extents =
|
|
((aBoundingBoxType == LOOSE_INK_EXTENTS &&
|
|
!needsGlyphExtents &&
|
|
!aTextRun->HasDetailedGlyphs()) ||
|
|
(MOZ_UNLIKELY(GetStyle()->sizeAdjust == 0.0)) ||
|
|
(MOZ_UNLIKELY(GetStyle()->size == 0))) ? nullptr
|
|
: GetOrCreateGlyphExtents(aTextRun->GetAppUnitsPerDevUnit());
|
|
double x = 0;
|
|
if (aSpacing) {
|
|
x += direction*aSpacing[0].mBefore;
|
|
}
|
|
uint32_t spaceGlyph = GetSpaceGlyph();
|
|
bool allGlyphsInvisible = true;
|
|
uint32_t i;
|
|
for (i = aStart; i < aEnd; ++i) {
|
|
const gfxTextRun::CompressedGlyph *glyphData = &charGlyphs[i];
|
|
if (glyphData->IsSimpleGlyph()) {
|
|
double advance = glyphData->GetSimpleAdvance();
|
|
uint32_t glyphIndex = glyphData->GetSimpleGlyph();
|
|
if (glyphIndex != spaceGlyph ||
|
|
!IsSpaceGlyphInvisible(aRefDrawTarget, aTextRun)) {
|
|
allGlyphsInvisible = false;
|
|
}
|
|
// Only get the real glyph horizontal extent if we were asked
|
|
// for the tight bounding box or we're in quality mode
|
|
if ((aBoundingBoxType != LOOSE_INK_EXTENTS || needsGlyphExtents) &&
|
|
extents){
|
|
uint16_t extentsWidth = extents->GetContainedGlyphWidthAppUnits(glyphIndex);
|
|
if (extentsWidth != gfxGlyphExtents::INVALID_WIDTH &&
|
|
aBoundingBoxType == LOOSE_INK_EXTENTS) {
|
|
UnionRange(x, &advanceMin, &advanceMax);
|
|
UnionRange(x + direction*extentsWidth, &advanceMin, &advanceMax);
|
|
} else {
|
|
gfxRect glyphRect;
|
|
if (!extents->GetTightGlyphExtentsAppUnits(this,
|
|
aRefDrawTarget, glyphIndex, &glyphRect)) {
|
|
glyphRect = gfxRect(0, metrics.mBoundingBox.Y(),
|
|
advance, metrics.mBoundingBox.Height());
|
|
}
|
|
if (orientation == eVertical) {
|
|
Swap(glyphRect.x, glyphRect.y);
|
|
Swap(glyphRect.width, glyphRect.height);
|
|
}
|
|
if (isRTL) {
|
|
glyphRect -= gfxPoint(advance, 0);
|
|
}
|
|
glyphRect += gfxPoint(x, 0);
|
|
metrics.mBoundingBox = metrics.mBoundingBox.Union(glyphRect);
|
|
}
|
|
}
|
|
x += direction*advance;
|
|
} else {
|
|
allGlyphsInvisible = false;
|
|
uint32_t glyphCount = glyphData->GetGlyphCount();
|
|
if (glyphCount > 0) {
|
|
const gfxTextRun::DetailedGlyph *details =
|
|
aTextRun->GetDetailedGlyphs(i);
|
|
NS_ASSERTION(details != nullptr,
|
|
"detailedGlyph record should not be missing!");
|
|
uint32_t j;
|
|
for (j = 0; j < glyphCount; ++j, ++details) {
|
|
uint32_t glyphIndex = details->mGlyphID;
|
|
gfxPoint glyphPt(x + details->mXOffset, details->mYOffset);
|
|
double advance = details->mAdvance;
|
|
gfxRect glyphRect;
|
|
if (glyphData->IsMissing() || !extents ||
|
|
!extents->GetTightGlyphExtentsAppUnits(this,
|
|
aRefDrawTarget, glyphIndex, &glyphRect)) {
|
|
// We might have failed to get glyph extents due to
|
|
// OOM or something
|
|
glyphRect = gfxRect(0, -metrics.mAscent,
|
|
advance, metrics.mAscent + metrics.mDescent);
|
|
}
|
|
if (orientation == eVertical) {
|
|
Swap(glyphRect.x, glyphRect.y);
|
|
Swap(glyphRect.width, glyphRect.height);
|
|
}
|
|
if (isRTL) {
|
|
glyphRect -= gfxPoint(advance, 0);
|
|
}
|
|
glyphRect += glyphPt;
|
|
metrics.mBoundingBox = metrics.mBoundingBox.Union(glyphRect);
|
|
x += direction*advance;
|
|
}
|
|
}
|
|
}
|
|
// Every other glyph type is ignored
|
|
if (aSpacing) {
|
|
double space = aSpacing[i - aStart].mAfter;
|
|
if (i + 1 < aEnd) {
|
|
space += aSpacing[i + 1 - aStart].mBefore;
|
|
}
|
|
x += direction*space;
|
|
}
|
|
}
|
|
|
|
if (allGlyphsInvisible) {
|
|
metrics.mBoundingBox.SetEmpty();
|
|
} else {
|
|
if (aBoundingBoxType == LOOSE_INK_EXTENTS) {
|
|
UnionRange(x, &advanceMin, &advanceMax);
|
|
gfxRect fontBox(advanceMin, -metrics.mAscent,
|
|
advanceMax - advanceMin, metrics.mAscent + metrics.mDescent);
|
|
metrics.mBoundingBox = metrics.mBoundingBox.Union(fontBox);
|
|
}
|
|
if (isRTL) {
|
|
metrics.mBoundingBox -= gfxPoint(x, 0);
|
|
}
|
|
}
|
|
|
|
// If the font may be rendered with a fake-italic effect, we need to allow
|
|
// for the top-right of the glyphs being skewed to the right, and the
|
|
// bottom-left being skewed further left.
|
|
if (mStyle.style != NS_FONT_STYLE_NORMAL &&
|
|
mFontEntry->IsUpright() &&
|
|
mStyle.allowSyntheticStyle) {
|
|
gfxFloat extendLeftEdge =
|
|
ceil(OBLIQUE_SKEW_FACTOR * metrics.mBoundingBox.YMost());
|
|
gfxFloat extendRightEdge =
|
|
ceil(OBLIQUE_SKEW_FACTOR * -metrics.mBoundingBox.y);
|
|
metrics.mBoundingBox.width += extendLeftEdge + extendRightEdge;
|
|
metrics.mBoundingBox.x -= extendLeftEdge;
|
|
}
|
|
|
|
if (baselineOffset != 0) {
|
|
metrics.mAscent -= baselineOffset;
|
|
metrics.mDescent += baselineOffset;
|
|
metrics.mBoundingBox.y += baselineOffset;
|
|
}
|
|
|
|
metrics.mAdvanceWidth = x*direction;
|
|
return metrics;
|
|
}
|
|
|
|
void
|
|
gfxFont::AgeCachedWords()
|
|
{
|
|
if (mWordCache) {
|
|
for (auto it = mWordCache->Iter(); !it.Done(); it.Next()) {
|
|
CacheHashEntry *entry = it.Get();
|
|
if (!entry->mShapedWord) {
|
|
NS_ASSERTION(entry->mShapedWord,
|
|
"cache entry has no gfxShapedWord!");
|
|
it.Remove();
|
|
} else if (entry->mShapedWord->IncrementAge() ==
|
|
kShapedWordCacheMaxAge) {
|
|
it.Remove();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
gfxFont::NotifyGlyphsChanged()
|
|
{
|
|
uint32_t i, count = mGlyphExtentsArray.Length();
|
|
for (i = 0; i < count; ++i) {
|
|
// Flush cached extents array
|
|
mGlyphExtentsArray[i]->NotifyGlyphsChanged();
|
|
}
|
|
|
|
if (mGlyphChangeObservers) {
|
|
for (auto it = mGlyphChangeObservers->Iter(); !it.Done(); it.Next()) {
|
|
it.Get()->GetKey()->NotifyGlyphsChanged();
|
|
}
|
|
}
|
|
}
|
|
|
|
// If aChar is a "word boundary" for shaped-word caching purposes, return it;
|
|
// else return 0.
|
|
static char16_t
|
|
IsBoundarySpace(char16_t aChar, char16_t aNextChar)
|
|
{
|
|
if ((aChar == ' ' || aChar == 0x00A0) && !IsClusterExtender(aNextChar)) {
|
|
return aChar;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#ifdef __GNUC__
|
|
#define GFX_MAYBE_UNUSED __attribute__((unused))
|
|
#else
|
|
#define GFX_MAYBE_UNUSED
|
|
#endif
|
|
|
|
/* GetShapedWord is in gfxFont-Impl.h */
|
|
|
|
bool
|
|
gfxFont::CacheHashEntry::KeyEquals(const KeyTypePointer aKey) const
|
|
{
|
|
const gfxShapedWord* sw = mShapedWord.get();
|
|
if (!sw) {
|
|
return false;
|
|
}
|
|
if (sw->GetLength() != aKey->mLength ||
|
|
sw->GetFlags() != aKey->mFlags ||
|
|
sw->GetAppUnitsPerDevUnit() != aKey->mAppUnitsPerDevUnit ||
|
|
sw->GetScript() != aKey->mScript) {
|
|
return false;
|
|
}
|
|
if (sw->TextIs8Bit()) {
|
|
if (aKey->mTextIs8Bit) {
|
|
return (0 == memcmp(sw->Text8Bit(), aKey->mText.mSingle,
|
|
aKey->mLength * sizeof(uint8_t)));
|
|
}
|
|
// The key has 16-bit text, even though all the characters are < 256,
|
|
// so the TEXT_IS_8BIT flag was set and the cached ShapedWord we're
|
|
// comparing with will have 8-bit text.
|
|
const uint8_t *s1 = sw->Text8Bit();
|
|
const char16_t *s2 = aKey->mText.mDouble;
|
|
const char16_t *s2end = s2 + aKey->mLength;
|
|
while (s2 < s2end) {
|
|
if (*s1++ != *s2++) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
NS_ASSERTION((aKey->mFlags & gfxTextRunFactory::TEXT_IS_8BIT) == 0 &&
|
|
!aKey->mTextIs8Bit, "didn't expect 8-bit text here");
|
|
return (0 == memcmp(sw->TextUnicode(), aKey->mText.mDouble,
|
|
aKey->mLength * sizeof(char16_t)));
|
|
}
|
|
|
|
bool
|
|
gfxFont::ShapeText(DrawTarget *aDrawTarget,
|
|
const uint8_t *aText,
|
|
uint32_t aOffset,
|
|
uint32_t aLength,
|
|
Script aScript,
|
|
bool aVertical,
|
|
gfxShapedText *aShapedText)
|
|
{
|
|
nsDependentCSubstring ascii((const char*)aText, aLength);
|
|
nsAutoString utf16;
|
|
AppendASCIItoUTF16(ascii, utf16);
|
|
if (utf16.Length() != aLength) {
|
|
return false;
|
|
}
|
|
return ShapeText(aDrawTarget, utf16.BeginReading(), aOffset, aLength,
|
|
aScript, aVertical, aShapedText);
|
|
}
|
|
|
|
bool
|
|
gfxFont::ShapeText(DrawTarget *aDrawTarget,
|
|
const char16_t *aText,
|
|
uint32_t aOffset,
|
|
uint32_t aLength,
|
|
Script aScript,
|
|
bool aVertical,
|
|
gfxShapedText *aShapedText)
|
|
{
|
|
bool ok = false;
|
|
|
|
// XXX Currently, we do all vertical shaping through harfbuzz.
|
|
// Vertical graphite support may be wanted as a future enhancement.
|
|
if (FontCanSupportGraphite() && !aVertical) {
|
|
if (gfxPlatform::GetPlatform()->UseGraphiteShaping()) {
|
|
if (!mGraphiteShaper) {
|
|
mGraphiteShaper = MakeUnique<gfxGraphiteShaper>(this);
|
|
}
|
|
ok = mGraphiteShaper->ShapeText(aDrawTarget, aText, aOffset, aLength,
|
|
aScript, aVertical, aShapedText);
|
|
}
|
|
}
|
|
|
|
if (!ok) {
|
|
if (!mHarfBuzzShaper) {
|
|
mHarfBuzzShaper = MakeUnique<gfxHarfBuzzShaper>(this);
|
|
}
|
|
ok = mHarfBuzzShaper->ShapeText(aDrawTarget, aText, aOffset, aLength,
|
|
aScript, aVertical, aShapedText);
|
|
}
|
|
|
|
NS_WARNING_ASSERTION(ok, "shaper failed, expect scrambled or missing text");
|
|
|
|
PostShapingFixup(aDrawTarget, aText, aOffset, aLength,
|
|
aVertical, aShapedText);
|
|
|
|
return ok;
|
|
}
|
|
|
|
void
|
|
gfxFont::PostShapingFixup(DrawTarget* aDrawTarget,
|
|
const char16_t* aText,
|
|
uint32_t aOffset,
|
|
uint32_t aLength,
|
|
bool aVertical,
|
|
gfxShapedText* aShapedText)
|
|
{
|
|
if (IsSyntheticBold()) {
|
|
const Metrics& metrics =
|
|
GetMetrics(aVertical ? eVertical : eHorizontal);
|
|
if (metrics.maxAdvance > metrics.aveCharWidth) {
|
|
float synBoldOffset =
|
|
GetSyntheticBoldOffset() * CalcXScale(aDrawTarget);
|
|
aShapedText->AdjustAdvancesForSyntheticBold(synBoldOffset,
|
|
aOffset, aLength);
|
|
}
|
|
}
|
|
}
|
|
|
|
#define MAX_SHAPING_LENGTH 32760 // slightly less than 32K, trying to avoid
|
|
// over-stressing platform shapers
|
|
#define BACKTRACK_LIMIT 16 // backtrack this far looking for a good place
|
|
// to split into fragments for separate shaping
|
|
|
|
template<typename T>
|
|
bool
|
|
gfxFont::ShapeFragmentWithoutWordCache(DrawTarget *aDrawTarget,
|
|
const T *aText,
|
|
uint32_t aOffset,
|
|
uint32_t aLength,
|
|
Script aScript,
|
|
bool aVertical,
|
|
gfxTextRun *aTextRun)
|
|
{
|
|
aTextRun->SetupClusterBoundaries(aOffset, aText, aLength);
|
|
|
|
bool ok = true;
|
|
|
|
while (ok && aLength > 0) {
|
|
uint32_t fragLen = aLength;
|
|
|
|
// limit the length of text we pass to shapers in a single call
|
|
if (fragLen > MAX_SHAPING_LENGTH) {
|
|
fragLen = MAX_SHAPING_LENGTH;
|
|
|
|
// in the 8-bit case, there are no multi-char clusters,
|
|
// so we don't need to do this check
|
|
if (sizeof(T) == sizeof(char16_t)) {
|
|
uint32_t i;
|
|
for (i = 0; i < BACKTRACK_LIMIT; ++i) {
|
|
if (aTextRun->IsClusterStart(aOffset + fragLen - i)) {
|
|
fragLen -= i;
|
|
break;
|
|
}
|
|
}
|
|
if (i == BACKTRACK_LIMIT) {
|
|
// if we didn't find any cluster start while backtracking,
|
|
// just check that we're not in the middle of a surrogate
|
|
// pair; back up by one code unit if we are.
|
|
if (NS_IS_LOW_SURROGATE(aText[fragLen]) &&
|
|
NS_IS_HIGH_SURROGATE(aText[fragLen - 1])) {
|
|
--fragLen;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
ok = ShapeText(aDrawTarget, aText, aOffset, fragLen, aScript, aVertical,
|
|
aTextRun);
|
|
|
|
aText += fragLen;
|
|
aOffset += fragLen;
|
|
aLength -= fragLen;
|
|
}
|
|
|
|
return ok;
|
|
}
|
|
|
|
// Check if aCh is an unhandled control character that should be displayed
|
|
// as a hexbox rather than rendered by some random font on the system.
|
|
// We exclude \r as stray s are rather common (bug 941940).
|
|
// Note that \n and \t don't come through here, as they have specific
|
|
// meanings that have already been handled.
|
|
static bool
|
|
IsInvalidControlChar(uint32_t aCh)
|
|
{
|
|
return aCh != '\r' && ((aCh & 0x7f) < 0x20 || aCh == 0x7f);
|
|
}
|
|
|
|
template<typename T>
|
|
bool
|
|
gfxFont::ShapeTextWithoutWordCache(DrawTarget *aDrawTarget,
|
|
const T *aText,
|
|
uint32_t aOffset,
|
|
uint32_t aLength,
|
|
Script aScript,
|
|
bool aVertical,
|
|
gfxTextRun *aTextRun)
|
|
{
|
|
uint32_t fragStart = 0;
|
|
bool ok = true;
|
|
|
|
for (uint32_t i = 0; i <= aLength && ok; ++i) {
|
|
T ch = (i < aLength) ? aText[i] : '\n';
|
|
bool invalid = gfxFontGroup::IsInvalidChar(ch);
|
|
uint32_t length = i - fragStart;
|
|
|
|
// break into separate fragments when we hit an invalid char
|
|
if (!invalid) {
|
|
continue;
|
|
}
|
|
|
|
if (length > 0) {
|
|
ok = ShapeFragmentWithoutWordCache(aDrawTarget, aText + fragStart,
|
|
aOffset + fragStart, length,
|
|
aScript, aVertical, aTextRun);
|
|
}
|
|
|
|
if (i == aLength) {
|
|
break;
|
|
}
|
|
|
|
// fragment was terminated by an invalid char: skip it,
|
|
// unless it's a control char that we want to show as a hexbox,
|
|
// but record where TAB or NEWLINE occur
|
|
if (ch == '\t') {
|
|
aTextRun->SetIsTab(aOffset + i);
|
|
} else if (ch == '\n') {
|
|
aTextRun->SetIsNewline(aOffset + i);
|
|
} else if (IsInvalidControlChar(ch) &&
|
|
!(aTextRun->GetFlags() & gfxTextRunFactory::TEXT_HIDE_CONTROL_CHARACTERS)) {
|
|
if (GetFontEntry()->IsUserFont() && HasCharacter(ch)) {
|
|
ShapeFragmentWithoutWordCache(aDrawTarget, aText + i,
|
|
aOffset + i, 1,
|
|
aScript, aVertical, aTextRun);
|
|
} else {
|
|
aTextRun->SetMissingGlyph(aOffset + i, ch, this);
|
|
}
|
|
}
|
|
fragStart = i + 1;
|
|
}
|
|
|
|
NS_WARNING_ASSERTION(ok, "failed to shape text - expect garbled text");
|
|
return ok;
|
|
}
|
|
|
|
#ifndef RELEASE_OR_BETA
|
|
#define TEXT_PERF_INCR(tp, m) (tp ? (tp)->current.m++ : 0)
|
|
#else
|
|
#define TEXT_PERF_INCR(tp, m)
|
|
#endif
|
|
|
|
inline static bool IsChar8Bit(uint8_t /*aCh*/) { return true; }
|
|
inline static bool IsChar8Bit(char16_t aCh) { return aCh < 0x100; }
|
|
|
|
inline static bool HasSpaces(const uint8_t *aString, uint32_t aLen)
|
|
{
|
|
return memchr(aString, 0x20, aLen) != nullptr;
|
|
}
|
|
|
|
inline static bool HasSpaces(const char16_t *aString, uint32_t aLen)
|
|
{
|
|
for (const char16_t *ch = aString; ch < aString + aLen; ch++) {
|
|
if (*ch == 0x20) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
template<typename T>
|
|
bool
|
|
gfxFont::SplitAndInitTextRun(DrawTarget *aDrawTarget,
|
|
gfxTextRun *aTextRun,
|
|
const T *aString, // text for this font run
|
|
uint32_t aRunStart, // position in the textrun
|
|
uint32_t aRunLength,
|
|
Script aRunScript,
|
|
bool aVertical)
|
|
{
|
|
if (aRunLength == 0) {
|
|
return true;
|
|
}
|
|
|
|
gfxTextPerfMetrics *tp = nullptr;
|
|
|
|
#ifndef RELEASE_OR_BETA
|
|
tp = aTextRun->GetFontGroup()->GetTextPerfMetrics();
|
|
if (tp) {
|
|
if (mStyle.systemFont) {
|
|
tp->current.numChromeTextRuns++;
|
|
} else {
|
|
tp->current.numContentTextRuns++;
|
|
}
|
|
tp->current.numChars += aRunLength;
|
|
if (aRunLength > tp->current.maxTextRunLen) {
|
|
tp->current.maxTextRunLen = aRunLength;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
uint32_t wordCacheCharLimit =
|
|
gfxPlatform::GetPlatform()->WordCacheCharLimit();
|
|
|
|
// If spaces can participate in shaping (e.g. within lookups for automatic
|
|
// fractions), need to shape without using the word cache which segments
|
|
// textruns on space boundaries. Word cache can be used if the textrun
|
|
// is short enough to fit in the word cache and it lacks spaces.
|
|
if (SpaceMayParticipateInShaping(aRunScript)) {
|
|
if (aRunLength > wordCacheCharLimit ||
|
|
HasSpaces(aString, aRunLength)) {
|
|
TEXT_PERF_INCR(tp, wordCacheSpaceRules);
|
|
return ShapeTextWithoutWordCache(aDrawTarget, aString,
|
|
aRunStart, aRunLength,
|
|
aRunScript, aVertical,
|
|
aTextRun);
|
|
}
|
|
}
|
|
|
|
InitWordCache();
|
|
|
|
// the only flags we care about for ShapedWord construction/caching
|
|
uint32_t flags = aTextRun->GetFlags();
|
|
flags &= (gfxTextRunFactory::TEXT_IS_RTL |
|
|
gfxTextRunFactory::TEXT_DISABLE_OPTIONAL_LIGATURES |
|
|
gfxTextRunFactory::TEXT_USE_MATH_SCRIPT |
|
|
gfxTextRunFactory::TEXT_ORIENT_MASK);
|
|
if (sizeof(T) == sizeof(uint8_t)) {
|
|
flags |= gfxTextRunFactory::TEXT_IS_8BIT;
|
|
}
|
|
|
|
uint32_t wordStart = 0;
|
|
uint32_t hash = 0;
|
|
bool wordIs8Bit = true;
|
|
int32_t appUnitsPerDevUnit = aTextRun->GetAppUnitsPerDevUnit();
|
|
|
|
T nextCh = aString[0];
|
|
for (uint32_t i = 0; i <= aRunLength; ++i) {
|
|
T ch = nextCh;
|
|
nextCh = (i < aRunLength - 1) ? aString[i + 1] : '\n';
|
|
T boundary = IsBoundarySpace(ch, nextCh);
|
|
bool invalid = !boundary && gfxFontGroup::IsInvalidChar(ch);
|
|
uint32_t length = i - wordStart;
|
|
|
|
// break into separate ShapedWords when we hit an invalid char,
|
|
// or a boundary space (always handled individually),
|
|
// or the first non-space after a space
|
|
if (!boundary && !invalid) {
|
|
if (!IsChar8Bit(ch)) {
|
|
wordIs8Bit = false;
|
|
}
|
|
// include this character in the hash, and move on to next
|
|
hash = gfxShapedWord::HashMix(hash, ch);
|
|
continue;
|
|
}
|
|
|
|
// We've decided to break here (i.e. we're at the end of a "word");
|
|
// shape the word and add it to the textrun.
|
|
// For words longer than the limit, we don't use the
|
|
// font's word cache but just shape directly into the textrun.
|
|
if (length > wordCacheCharLimit) {
|
|
TEXT_PERF_INCR(tp, wordCacheLong);
|
|
bool ok = ShapeFragmentWithoutWordCache(aDrawTarget,
|
|
aString + wordStart,
|
|
aRunStart + wordStart,
|
|
length,
|
|
aRunScript,
|
|
aVertical,
|
|
aTextRun);
|
|
if (!ok) {
|
|
return false;
|
|
}
|
|
} else if (length > 0) {
|
|
uint32_t wordFlags = flags;
|
|
// in the 8-bit version of this method, TEXT_IS_8BIT was
|
|
// already set as part of |flags|, so no need for a per-word
|
|
// adjustment here
|
|
if (sizeof(T) == sizeof(char16_t)) {
|
|
if (wordIs8Bit) {
|
|
wordFlags |= gfxTextRunFactory::TEXT_IS_8BIT;
|
|
}
|
|
}
|
|
gfxShapedWord* sw = GetShapedWord(aDrawTarget,
|
|
aString + wordStart, length,
|
|
hash, aRunScript, aVertical,
|
|
appUnitsPerDevUnit,
|
|
wordFlags, tp);
|
|
if (sw) {
|
|
aTextRun->CopyGlyphDataFrom(sw, aRunStart + wordStart);
|
|
} else {
|
|
return false; // failed, presumably out of memory?
|
|
}
|
|
}
|
|
|
|
if (boundary) {
|
|
// word was terminated by a space: add that to the textrun
|
|
uint16_t orientation = flags & gfxTextRunFactory::TEXT_ORIENT_MASK;
|
|
if (orientation == gfxTextRunFactory::TEXT_ORIENT_VERTICAL_MIXED) {
|
|
orientation = aVertical ?
|
|
gfxTextRunFactory::TEXT_ORIENT_VERTICAL_UPRIGHT :
|
|
gfxTextRunFactory::TEXT_ORIENT_VERTICAL_SIDEWAYS_RIGHT;
|
|
}
|
|
if (boundary != ' ' ||
|
|
!aTextRun->SetSpaceGlyphIfSimple(this, aRunStart + i, ch,
|
|
orientation)) {
|
|
// Currently, the only "boundary" characters we recognize are
|
|
// space and no-break space, which are both 8-bit, so we force
|
|
// that flag (below). If we ever change IsBoundarySpace, we
|
|
// may need to revise this.
|
|
// Avoid tautological-constant-out-of-range-compare in 8-bit:
|
|
DebugOnly<char16_t> boundary16 = boundary;
|
|
NS_ASSERTION(boundary16 < 256, "unexpected boundary!");
|
|
gfxShapedWord *sw =
|
|
GetShapedWord(aDrawTarget, &boundary, 1,
|
|
gfxShapedWord::HashMix(0, boundary),
|
|
aRunScript, aVertical, appUnitsPerDevUnit,
|
|
flags | gfxTextRunFactory::TEXT_IS_8BIT, tp);
|
|
if (sw) {
|
|
aTextRun->CopyGlyphDataFrom(sw, aRunStart + i);
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
hash = 0;
|
|
wordStart = i + 1;
|
|
wordIs8Bit = true;
|
|
continue;
|
|
}
|
|
|
|
if (i == aRunLength) {
|
|
break;
|
|
}
|
|
|
|
NS_ASSERTION(invalid,
|
|
"how did we get here except via an invalid char?");
|
|
|
|
// word was terminated by an invalid char: skip it,
|
|
// unless it's a control char that we want to show as a hexbox,
|
|
// but record where TAB or NEWLINE occur
|
|
if (ch == '\t') {
|
|
aTextRun->SetIsTab(aRunStart + i);
|
|
} else if (ch == '\n') {
|
|
aTextRun->SetIsNewline(aRunStart + i);
|
|
} else if (IsInvalidControlChar(ch) &&
|
|
!(aTextRun->GetFlags() & gfxTextRunFactory::TEXT_HIDE_CONTROL_CHARACTERS)) {
|
|
if (GetFontEntry()->IsUserFont() && HasCharacter(ch)) {
|
|
ShapeFragmentWithoutWordCache(aDrawTarget, aString + i,
|
|
aRunStart + i, 1,
|
|
aRunScript, aVertical, aTextRun);
|
|
} else {
|
|
aTextRun->SetMissingGlyph(aRunStart + i, ch, this);
|
|
}
|
|
}
|
|
|
|
hash = 0;
|
|
wordStart = i + 1;
|
|
wordIs8Bit = true;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// Explicit instantiations of SplitAndInitTextRun, to avoid libxul link failure
|
|
template bool
|
|
gfxFont::SplitAndInitTextRun(DrawTarget *aDrawTarget,
|
|
gfxTextRun *aTextRun,
|
|
const uint8_t *aString,
|
|
uint32_t aRunStart,
|
|
uint32_t aRunLength,
|
|
Script aRunScript,
|
|
bool aVertical);
|
|
template bool
|
|
gfxFont::SplitAndInitTextRun(DrawTarget *aDrawTarget,
|
|
gfxTextRun *aTextRun,
|
|
const char16_t *aString,
|
|
uint32_t aRunStart,
|
|
uint32_t aRunLength,
|
|
Script aRunScript,
|
|
bool aVertical);
|
|
|
|
template<>
|
|
bool
|
|
gfxFont::InitFakeSmallCapsRun(DrawTarget *aDrawTarget,
|
|
gfxTextRun *aTextRun,
|
|
const char16_t *aText,
|
|
uint32_t aOffset,
|
|
uint32_t aLength,
|
|
uint8_t aMatchType,
|
|
uint16_t aOrientation,
|
|
Script aScript,
|
|
bool aSyntheticLower,
|
|
bool aSyntheticUpper)
|
|
{
|
|
bool ok = true;
|
|
|
|
RefPtr<gfxFont> smallCapsFont = GetSmallCapsFont();
|
|
if (!smallCapsFont) {
|
|
NS_WARNING("failed to get reduced-size font for smallcaps!");
|
|
smallCapsFont = this;
|
|
}
|
|
|
|
enum RunCaseAction {
|
|
kNoChange,
|
|
kUppercaseReduce,
|
|
kUppercase
|
|
};
|
|
|
|
RunCaseAction runAction = kNoChange;
|
|
uint32_t runStart = 0;
|
|
bool vertical =
|
|
aOrientation == gfxTextRunFactory::TEXT_ORIENT_VERTICAL_UPRIGHT;
|
|
|
|
for (uint32_t i = 0; i <= aLength; ++i) {
|
|
uint32_t extraCodeUnits = 0; // Will be set to 1 if we need to consume
|
|
// a trailing surrogate as well as the
|
|
// current code unit.
|
|
RunCaseAction chAction = kNoChange;
|
|
// Unless we're at the end, figure out what treatment the current
|
|
// character will need.
|
|
if (i < aLength) {
|
|
uint32_t ch = aText[i];
|
|
if (NS_IS_HIGH_SURROGATE(ch) && i < aLength - 1 &&
|
|
NS_IS_LOW_SURROGATE(aText[i + 1])) {
|
|
ch = SURROGATE_TO_UCS4(ch, aText[i + 1]);
|
|
extraCodeUnits = 1;
|
|
}
|
|
// Characters that aren't the start of a cluster are ignored here.
|
|
// They get added to whatever lowercase/non-lowercase run we're in.
|
|
if (IsClusterExtender(ch)) {
|
|
chAction = runAction;
|
|
} else {
|
|
if (ch != ToUpperCase(ch) || SpecialUpper(ch)) {
|
|
// ch is lower case
|
|
chAction = (aSyntheticLower ? kUppercaseReduce : kNoChange);
|
|
} else if (ch != ToLowerCase(ch)) {
|
|
// ch is upper case
|
|
chAction = (aSyntheticUpper ? kUppercaseReduce : kNoChange);
|
|
if (mStyle.explicitLanguage &&
|
|
mStyle.language == nsGkAtoms::el) {
|
|
// In Greek, check for characters that will be modified by
|
|
// the GreekUpperCase mapping - this catches accented
|
|
// capitals where the accent is to be removed (bug 307039).
|
|
// These are handled by using the full-size font with the
|
|
// uppercasing transform.
|
|
mozilla::GreekCasing::State state;
|
|
uint32_t ch2 = mozilla::GreekCasing::UpperCase(ch, state);
|
|
if (ch != ch2 && !aSyntheticUpper) {
|
|
chAction = kUppercase;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// At the end of the text or when the current character needs different
|
|
// casing treatment from the current run, finish the run-in-progress
|
|
// and prepare to accumulate a new run.
|
|
// Note that we do not look at any source data for offset [i] here,
|
|
// as that would be invalid in the case where i==length.
|
|
if ((i == aLength || runAction != chAction) && runStart < i) {
|
|
uint32_t runLength = i - runStart;
|
|
gfxFont* f = this;
|
|
switch (runAction) {
|
|
case kNoChange:
|
|
// just use the current font and the existing string
|
|
aTextRun->AddGlyphRun(f, aMatchType, aOffset + runStart, true,
|
|
aOrientation);
|
|
if (!f->SplitAndInitTextRun(aDrawTarget, aTextRun,
|
|
aText + runStart,
|
|
aOffset + runStart, runLength,
|
|
aScript, vertical)) {
|
|
ok = false;
|
|
}
|
|
break;
|
|
|
|
case kUppercaseReduce:
|
|
// use reduced-size font, then fall through to uppercase the text
|
|
f = smallCapsFont;
|
|
MOZ_FALLTHROUGH;
|
|
|
|
case kUppercase:
|
|
// apply uppercase transform to the string
|
|
nsDependentSubstring origString(aText + runStart, runLength);
|
|
nsAutoString convertedString;
|
|
AutoTArray<bool,50> charsToMergeArray;
|
|
AutoTArray<bool,50> deletedCharsArray;
|
|
|
|
bool mergeNeeded = nsCaseTransformTextRunFactory::
|
|
TransformString(origString,
|
|
convertedString,
|
|
true,
|
|
mStyle.explicitLanguage
|
|
? mStyle.language.get() : nullptr,
|
|
charsToMergeArray,
|
|
deletedCharsArray);
|
|
|
|
if (mergeNeeded) {
|
|
// This is the hard case: the transformation caused chars
|
|
// to be inserted or deleted, so we can't shape directly
|
|
// into the destination textrun but have to handle the
|
|
// mismatch of character positions.
|
|
gfxTextRunFactory::Parameters params = {
|
|
aDrawTarget, nullptr, nullptr, nullptr, 0,
|
|
aTextRun->GetAppUnitsPerDevUnit()
|
|
};
|
|
RefPtr<gfxTextRun> tempRun(
|
|
gfxTextRun::Create(¶ms, convertedString.Length(),
|
|
aTextRun->GetFontGroup(), 0));
|
|
tempRun->AddGlyphRun(f, aMatchType, 0, true, aOrientation);
|
|
if (!f->SplitAndInitTextRun(aDrawTarget, tempRun.get(),
|
|
convertedString.BeginReading(),
|
|
0, convertedString.Length(),
|
|
aScript, vertical)) {
|
|
ok = false;
|
|
} else {
|
|
RefPtr<gfxTextRun> mergedRun(
|
|
gfxTextRun::Create(¶ms, runLength,
|
|
aTextRun->GetFontGroup(), 0));
|
|
MergeCharactersInTextRun(mergedRun.get(), tempRun.get(),
|
|
charsToMergeArray.Elements(),
|
|
deletedCharsArray.Elements());
|
|
gfxTextRun::Range runRange(0, runLength);
|
|
aTextRun->CopyGlyphDataFrom(mergedRun.get(), runRange,
|
|
aOffset + runStart);
|
|
}
|
|
} else {
|
|
aTextRun->AddGlyphRun(f, aMatchType, aOffset + runStart,
|
|
true, aOrientation);
|
|
if (!f->SplitAndInitTextRun(aDrawTarget, aTextRun,
|
|
convertedString.BeginReading(),
|
|
aOffset + runStart, runLength,
|
|
aScript, vertical)) {
|
|
ok = false;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
runStart = i;
|
|
}
|
|
|
|
i += extraCodeUnits;
|
|
if (i < aLength) {
|
|
runAction = chAction;
|
|
}
|
|
}
|
|
|
|
return ok;
|
|
}
|
|
|
|
template<>
|
|
bool
|
|
gfxFont::InitFakeSmallCapsRun(DrawTarget *aDrawTarget,
|
|
gfxTextRun *aTextRun,
|
|
const uint8_t *aText,
|
|
uint32_t aOffset,
|
|
uint32_t aLength,
|
|
uint8_t aMatchType,
|
|
uint16_t aOrientation,
|
|
Script aScript,
|
|
bool aSyntheticLower,
|
|
bool aSyntheticUpper)
|
|
{
|
|
NS_ConvertASCIItoUTF16 unicodeString(reinterpret_cast<const char*>(aText),
|
|
aLength);
|
|
return InitFakeSmallCapsRun(aDrawTarget, aTextRun, static_cast<const char16_t*>(unicodeString.get()),
|
|
aOffset, aLength, aMatchType, aOrientation,
|
|
aScript, aSyntheticLower, aSyntheticUpper);
|
|
}
|
|
|
|
already_AddRefed<gfxFont>
|
|
gfxFont::GetSmallCapsFont()
|
|
{
|
|
gfxFontStyle style(*GetStyle());
|
|
style.size *= SMALL_CAPS_SCALE_FACTOR;
|
|
style.variantCaps = NS_FONT_VARIANT_CAPS_NORMAL;
|
|
gfxFontEntry* fe = GetFontEntry();
|
|
bool needsBold = style.weight >= 600 && !fe->IsBold();
|
|
return fe->FindOrMakeFont(&style, needsBold, mUnicodeRangeMap);
|
|
}
|
|
|
|
already_AddRefed<gfxFont>
|
|
gfxFont::GetSubSuperscriptFont(int32_t aAppUnitsPerDevPixel)
|
|
{
|
|
gfxFontStyle style(*GetStyle());
|
|
style.AdjustForSubSuperscript(aAppUnitsPerDevPixel);
|
|
gfxFontEntry* fe = GetFontEntry();
|
|
bool needsBold = style.weight >= 600 && !fe->IsBold();
|
|
return fe->FindOrMakeFont(&style, needsBold, mUnicodeRangeMap);
|
|
}
|
|
|
|
static void
|
|
DestroyRefCairo(void* aData)
|
|
{
|
|
cairo_t* refCairo = static_cast<cairo_t*>(aData);
|
|
MOZ_ASSERT(refCairo);
|
|
cairo_destroy(refCairo);
|
|
}
|
|
|
|
/* static */ cairo_t *
|
|
gfxFont::RefCairo(DrawTarget* aDT)
|
|
{
|
|
// DrawTargets that don't use a Cairo backend can be given a 1x1 "reference"
|
|
// |cairo_t*|, stored in the DrawTarget's user data, for doing font-related
|
|
// operations.
|
|
static UserDataKey sRefCairo;
|
|
|
|
cairo_t* refCairo = nullptr;
|
|
if (aDT->GetBackendType() == BackendType::CAIRO) {
|
|
refCairo = static_cast<cairo_t*>
|
|
(aDT->GetNativeSurface(NativeSurfaceType::CAIRO_CONTEXT));
|
|
if (refCairo) {
|
|
return refCairo;
|
|
}
|
|
}
|
|
|
|
refCairo = static_cast<cairo_t*>(aDT->GetUserData(&sRefCairo));
|
|
if (!refCairo) {
|
|
refCairo = cairo_create(gfxPlatform::GetPlatform()->ScreenReferenceSurface()->CairoSurface());
|
|
aDT->AddUserData(&sRefCairo, refCairo, DestroyRefCairo);
|
|
}
|
|
|
|
return refCairo;
|
|
}
|
|
|
|
gfxGlyphExtents *
|
|
gfxFont::GetOrCreateGlyphExtents(int32_t aAppUnitsPerDevUnit) {
|
|
uint32_t i, count = mGlyphExtentsArray.Length();
|
|
for (i = 0; i < count; ++i) {
|
|
if (mGlyphExtentsArray[i]->GetAppUnitsPerDevUnit() == aAppUnitsPerDevUnit)
|
|
return mGlyphExtentsArray[i].get();
|
|
}
|
|
gfxGlyphExtents *glyphExtents = new gfxGlyphExtents(aAppUnitsPerDevUnit);
|
|
if (glyphExtents) {
|
|
mGlyphExtentsArray.AppendElement(glyphExtents);
|
|
// Initialize the extents of a space glyph, assuming that spaces don't
|
|
// render anything!
|
|
glyphExtents->SetContainedGlyphWidthAppUnits(GetSpaceGlyph(), 0);
|
|
}
|
|
return glyphExtents;
|
|
}
|
|
|
|
void
|
|
gfxFont::SetupGlyphExtents(DrawTarget* aDrawTarget, uint32_t aGlyphID,
|
|
bool aNeedTight, gfxGlyphExtents *aExtents)
|
|
{
|
|
gfxRect svgBounds;
|
|
if (mFontEntry->TryGetSVGData(this) && mFontEntry->HasSVGGlyph(aGlyphID) &&
|
|
mFontEntry->GetSVGGlyphExtents(aDrawTarget, aGlyphID, &svgBounds)) {
|
|
gfxFloat d2a = aExtents->GetAppUnitsPerDevUnit();
|
|
aExtents->SetTightGlyphExtents(aGlyphID,
|
|
gfxRect(svgBounds.x * d2a,
|
|
svgBounds.y * d2a,
|
|
svgBounds.width * d2a,
|
|
svgBounds.height * d2a));
|
|
return;
|
|
}
|
|
|
|
cairo_glyph_t glyph;
|
|
glyph.index = aGlyphID;
|
|
glyph.x = 0;
|
|
glyph.y = 0;
|
|
cairo_text_extents_t extents;
|
|
cairo_glyph_extents(gfxFont::RefCairo(aDrawTarget), &glyph, 1, &extents);
|
|
|
|
const Metrics& fontMetrics = GetMetrics(eHorizontal);
|
|
int32_t appUnitsPerDevUnit = aExtents->GetAppUnitsPerDevUnit();
|
|
if (!aNeedTight && extents.x_bearing >= 0 &&
|
|
extents.y_bearing >= -fontMetrics.maxAscent &&
|
|
extents.height + extents.y_bearing <= fontMetrics.maxDescent) {
|
|
uint32_t appUnitsWidth =
|
|
uint32_t(ceil((extents.x_bearing + extents.width)*appUnitsPerDevUnit));
|
|
if (appUnitsWidth < gfxGlyphExtents::INVALID_WIDTH) {
|
|
aExtents->SetContainedGlyphWidthAppUnits(aGlyphID, uint16_t(appUnitsWidth));
|
|
return;
|
|
}
|
|
}
|
|
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
|
|
if (!aNeedTight) {
|
|
++gGlyphExtentsSetupFallBackToTight;
|
|
}
|
|
#endif
|
|
|
|
gfxFloat d2a = appUnitsPerDevUnit;
|
|
gfxRect bounds(extents.x_bearing*d2a, extents.y_bearing*d2a,
|
|
extents.width*d2a, extents.height*d2a);
|
|
aExtents->SetTightGlyphExtents(aGlyphID, bounds);
|
|
}
|
|
|
|
// Try to initialize font metrics by reading sfnt tables directly;
|
|
// set mIsValid=TRUE and return TRUE on success.
|
|
// Return FALSE if the gfxFontEntry subclass does not
|
|
// implement GetFontTable(), or for non-sfnt fonts where tables are
|
|
// not available.
|
|
// If this returns TRUE without setting the mIsValid flag, then we -did-
|
|
// apparently find an sfnt, but it was too broken to be used.
|
|
bool
|
|
gfxFont::InitMetricsFromSfntTables(Metrics& aMetrics)
|
|
{
|
|
mIsValid = false; // font is NOT valid in case of early return
|
|
|
|
const uint32_t kHheaTableTag = TRUETYPE_TAG('h','h','e','a');
|
|
const uint32_t kPostTableTag = TRUETYPE_TAG('p','o','s','t');
|
|
const uint32_t kOS_2TableTag = TRUETYPE_TAG('O','S','/','2');
|
|
|
|
uint32_t len;
|
|
|
|
if (mFUnitsConvFactor < 0.0) {
|
|
// If the conversion factor from FUnits is not yet set,
|
|
// get the unitsPerEm from the 'head' table via the font entry
|
|
uint16_t unitsPerEm = GetFontEntry()->UnitsPerEm();
|
|
if (unitsPerEm == gfxFontEntry::kInvalidUPEM) {
|
|
return false;
|
|
}
|
|
mFUnitsConvFactor = GetAdjustedSize() / unitsPerEm;
|
|
}
|
|
|
|
// 'hhea' table is required to get vertical extents
|
|
gfxFontEntry::AutoTable hheaTable(mFontEntry, kHheaTableTag);
|
|
if (!hheaTable) {
|
|
return false; // no 'hhea' table -> not an sfnt
|
|
}
|
|
const MetricsHeader* hhea =
|
|
reinterpret_cast<const MetricsHeader*>
|
|
(hb_blob_get_data(hheaTable, &len));
|
|
if (len < sizeof(MetricsHeader)) {
|
|
return false;
|
|
}
|
|
|
|
#define SET_UNSIGNED(field,src) aMetrics.field = uint16_t(src) * mFUnitsConvFactor
|
|
#define SET_SIGNED(field,src) aMetrics.field = int16_t(src) * mFUnitsConvFactor
|
|
|
|
SET_UNSIGNED(maxAdvance, hhea->advanceWidthMax);
|
|
SET_SIGNED(maxAscent, hhea->ascender);
|
|
SET_SIGNED(maxDescent, -int16_t(hhea->descender));
|
|
SET_SIGNED(externalLeading, hhea->lineGap);
|
|
|
|
// 'post' table is required for underline metrics
|
|
gfxFontEntry::AutoTable postTable(mFontEntry, kPostTableTag);
|
|
if (!postTable) {
|
|
return true; // no 'post' table -> sfnt is not valid
|
|
}
|
|
const PostTable *post =
|
|
reinterpret_cast<const PostTable*>(hb_blob_get_data(postTable, &len));
|
|
if (len < offsetof(PostTable, underlineThickness) + sizeof(uint16_t)) {
|
|
return true; // bad post table -> sfnt is not valid
|
|
}
|
|
|
|
SET_SIGNED(underlineOffset, post->underlinePosition);
|
|
SET_UNSIGNED(underlineSize, post->underlineThickness);
|
|
|
|
// 'OS/2' table is optional, if not found we'll estimate xHeight
|
|
// and aveCharWidth by measuring glyphs
|
|
gfxFontEntry::AutoTable os2Table(mFontEntry, kOS_2TableTag);
|
|
if (os2Table) {
|
|
const OS2Table *os2 =
|
|
reinterpret_cast<const OS2Table*>(hb_blob_get_data(os2Table, &len));
|
|
// although sxHeight and sCapHeight are signed fields, we consider
|
|
// negative values to be erroneous and just ignore them
|
|
if (uint16_t(os2->version) >= 2) {
|
|
// version 2 and later includes the x-height and cap-height fields
|
|
if (len >= offsetof(OS2Table, sxHeight) + sizeof(int16_t) &&
|
|
int16_t(os2->sxHeight) > 0) {
|
|
SET_SIGNED(xHeight, os2->sxHeight);
|
|
}
|
|
if (len >= offsetof(OS2Table, sCapHeight) + sizeof(int16_t) &&
|
|
int16_t(os2->sCapHeight) > 0) {
|
|
SET_SIGNED(capHeight, os2->sCapHeight);
|
|
}
|
|
}
|
|
// this should always be present in any valid OS/2 of any version
|
|
if (len >= offsetof(OS2Table, sTypoLineGap) + sizeof(int16_t)) {
|
|
SET_SIGNED(aveCharWidth, os2->xAvgCharWidth);
|
|
SET_SIGNED(strikeoutSize, os2->yStrikeoutSize);
|
|
SET_SIGNED(strikeoutOffset, os2->yStrikeoutPosition);
|
|
|
|
// for fonts with USE_TYPO_METRICS set in the fsSelection field,
|
|
// let the OS/2 sTypo* metrics override those from the hhea table
|
|
// (see http://www.microsoft.com/typography/otspec/os2.htm#fss)
|
|
const uint16_t kUseTypoMetricsMask = 1 << 7;
|
|
if (uint16_t(os2->fsSelection) & kUseTypoMetricsMask) {
|
|
SET_SIGNED(maxAscent, os2->sTypoAscender);
|
|
SET_SIGNED(maxDescent, - int16_t(os2->sTypoDescender));
|
|
SET_SIGNED(externalLeading, os2->sTypoLineGap);
|
|
}
|
|
}
|
|
}
|
|
|
|
#undef SET_SIGNED
|
|
#undef SET_UNSIGNED
|
|
|
|
mIsValid = true;
|
|
|
|
return true;
|
|
}
|
|
|
|
static double
|
|
RoundToNearestMultiple(double aValue, double aFraction)
|
|
{
|
|
return floor(aValue/aFraction + 0.5) * aFraction;
|
|
}
|
|
|
|
void gfxFont::CalculateDerivedMetrics(Metrics& aMetrics)
|
|
{
|
|
aMetrics.maxAscent =
|
|
ceil(RoundToNearestMultiple(aMetrics.maxAscent, 1/1024.0));
|
|
aMetrics.maxDescent =
|
|
ceil(RoundToNearestMultiple(aMetrics.maxDescent, 1/1024.0));
|
|
|
|
if (aMetrics.xHeight <= 0) {
|
|
// only happens if we couldn't find either font metrics
|
|
// or a char to measure;
|
|
// pick an arbitrary value that's better than zero
|
|
aMetrics.xHeight = aMetrics.maxAscent * DEFAULT_XHEIGHT_FACTOR;
|
|
}
|
|
|
|
// If we have a font that doesn't provide a capHeight value, use maxAscent
|
|
// as a reasonable fallback.
|
|
if (aMetrics.capHeight <= 0) {
|
|
aMetrics.capHeight = aMetrics.maxAscent;
|
|
}
|
|
|
|
aMetrics.maxHeight = aMetrics.maxAscent + aMetrics.maxDescent;
|
|
|
|
if (aMetrics.maxHeight - aMetrics.emHeight > 0.0) {
|
|
aMetrics.internalLeading = aMetrics.maxHeight - aMetrics.emHeight;
|
|
} else {
|
|
aMetrics.internalLeading = 0.0;
|
|
}
|
|
|
|
aMetrics.emAscent = aMetrics.maxAscent * aMetrics.emHeight
|
|
/ aMetrics.maxHeight;
|
|
aMetrics.emDescent = aMetrics.emHeight - aMetrics.emAscent;
|
|
|
|
if (GetFontEntry()->IsFixedPitch()) {
|
|
// Some Quartz fonts are fixed pitch, but there's some glyph with a bigger
|
|
// advance than the average character width... this forces
|
|
// those fonts to be recognized like fixed pitch fonts by layout.
|
|
aMetrics.maxAdvance = aMetrics.aveCharWidth;
|
|
}
|
|
|
|
if (!aMetrics.strikeoutOffset) {
|
|
aMetrics.strikeoutOffset = aMetrics.xHeight * 0.5;
|
|
}
|
|
if (!aMetrics.strikeoutSize) {
|
|
aMetrics.strikeoutSize = aMetrics.underlineSize;
|
|
}
|
|
}
|
|
|
|
void
|
|
gfxFont::SanitizeMetrics(gfxFont::Metrics *aMetrics, bool aIsBadUnderlineFont)
|
|
{
|
|
// Even if this font size is zero, this font is created with non-zero size.
|
|
// However, for layout and others, we should return the metrics of zero size font.
|
|
if (mStyle.size == 0.0 || mStyle.sizeAdjust == 0.0) {
|
|
memset(aMetrics, 0, sizeof(gfxFont::Metrics));
|
|
return;
|
|
}
|
|
|
|
aMetrics->underlineSize = std::max(1.0, aMetrics->underlineSize);
|
|
aMetrics->strikeoutSize = std::max(1.0, aMetrics->strikeoutSize);
|
|
|
|
aMetrics->underlineOffset = std::min(aMetrics->underlineOffset, -1.0);
|
|
|
|
if (aMetrics->maxAscent < 1.0) {
|
|
// We cannot draw strikeout line and overline in the ascent...
|
|
aMetrics->underlineSize = 0;
|
|
aMetrics->underlineOffset = 0;
|
|
aMetrics->strikeoutSize = 0;
|
|
aMetrics->strikeoutOffset = 0;
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* Some CJK fonts have bad underline offset. Therefore, if this is such font,
|
|
* we need to lower the underline offset to bottom of *em* descent.
|
|
* However, if this is system font, we should not do this for the rendering compatibility with
|
|
* another application's UI on the platform.
|
|
* XXX Should not use this hack if the font size is too small?
|
|
* Such text cannot be read, this might be used for tight CSS rendering? (E.g., Acid2)
|
|
*/
|
|
if (!mStyle.systemFont && aIsBadUnderlineFont) {
|
|
// First, we need 2 pixels between baseline and underline at least. Because many CJK characters
|
|
// put their glyphs on the baseline, so, 1 pixel is too close for CJK characters.
|
|
aMetrics->underlineOffset = std::min(aMetrics->underlineOffset, -2.0);
|
|
|
|
// Next, we put the underline to bottom of below of the descent space.
|
|
if (aMetrics->internalLeading + aMetrics->externalLeading > aMetrics->underlineSize) {
|
|
aMetrics->underlineOffset = std::min(aMetrics->underlineOffset, -aMetrics->emDescent);
|
|
} else {
|
|
aMetrics->underlineOffset = std::min(aMetrics->underlineOffset,
|
|
aMetrics->underlineSize - aMetrics->emDescent);
|
|
}
|
|
}
|
|
// If underline positioned is too far from the text, descent position is preferred so that underline
|
|
// will stay within the boundary.
|
|
else if (aMetrics->underlineSize - aMetrics->underlineOffset > aMetrics->maxDescent) {
|
|
if (aMetrics->underlineSize > aMetrics->maxDescent)
|
|
aMetrics->underlineSize = std::max(aMetrics->maxDescent, 1.0);
|
|
// The max underlineOffset is 1px (the min underlineSize is 1px, and min maxDescent is 0px.)
|
|
aMetrics->underlineOffset = aMetrics->underlineSize - aMetrics->maxDescent;
|
|
}
|
|
|
|
// If strikeout line is overflowed from the ascent, the line should be resized and moved for
|
|
// that being in the ascent space.
|
|
// Note that the strikeoutOffset is *middle* of the strikeout line position.
|
|
gfxFloat halfOfStrikeoutSize = floor(aMetrics->strikeoutSize / 2.0 + 0.5);
|
|
if (halfOfStrikeoutSize + aMetrics->strikeoutOffset > aMetrics->maxAscent) {
|
|
if (aMetrics->strikeoutSize > aMetrics->maxAscent) {
|
|
aMetrics->strikeoutSize = std::max(aMetrics->maxAscent, 1.0);
|
|
halfOfStrikeoutSize = floor(aMetrics->strikeoutSize / 2.0 + 0.5);
|
|
}
|
|
gfxFloat ascent = floor(aMetrics->maxAscent + 0.5);
|
|
aMetrics->strikeoutOffset = std::max(halfOfStrikeoutSize, ascent / 2.0);
|
|
}
|
|
|
|
// If overline is larger than the ascent, the line should be resized.
|
|
if (aMetrics->underlineSize > aMetrics->maxAscent) {
|
|
aMetrics->underlineSize = aMetrics->maxAscent;
|
|
}
|
|
}
|
|
|
|
// Create a Metrics record to be used for vertical layout. This should never
|
|
// fail, as we've already decided this is a valid font. We do not have the
|
|
// option of marking it invalid (as can happen if we're unable to read
|
|
// horizontal metrics), because that could break a font that we're already
|
|
// using for horizontal text.
|
|
// So we will synthesize *something* usable here even if there aren't any of the
|
|
// usual font tables (which can happen in the case of a legacy bitmap or Type1
|
|
// font for which the platform-specific backend used platform APIs instead of
|
|
// sfnt tables to create the horizontal metrics).
|
|
const gfxFont::Metrics*
|
|
gfxFont::CreateVerticalMetrics()
|
|
{
|
|
const uint32_t kHheaTableTag = TRUETYPE_TAG('h','h','e','a');
|
|
const uint32_t kVheaTableTag = TRUETYPE_TAG('v','h','e','a');
|
|
const uint32_t kPostTableTag = TRUETYPE_TAG('p','o','s','t');
|
|
const uint32_t kOS_2TableTag = TRUETYPE_TAG('O','S','/','2');
|
|
uint32_t len;
|
|
|
|
Metrics* metrics = new Metrics;
|
|
::memset(metrics, 0, sizeof(Metrics));
|
|
|
|
// Some basic defaults, in case the font lacks any real metrics tables.
|
|
// TODO: consider what rounding (if any) we should apply to these.
|
|
metrics->emHeight = GetAdjustedSize();
|
|
metrics->emAscent = metrics->emHeight / 2;
|
|
metrics->emDescent = metrics->emHeight - metrics->emAscent;
|
|
|
|
metrics->maxAscent = metrics->emAscent;
|
|
metrics->maxDescent = metrics->emDescent;
|
|
|
|
const float UNINITIALIZED_LEADING = -10000.0f;
|
|
metrics->externalLeading = UNINITIALIZED_LEADING;
|
|
|
|
if (mFUnitsConvFactor < 0.0) {
|
|
uint16_t upem = GetFontEntry()->UnitsPerEm();
|
|
if (upem != gfxFontEntry::kInvalidUPEM) {
|
|
mFUnitsConvFactor = GetAdjustedSize() / upem;
|
|
}
|
|
}
|
|
|
|
#define SET_UNSIGNED(field,src) metrics->field = uint16_t(src) * mFUnitsConvFactor
|
|
#define SET_SIGNED(field,src) metrics->field = int16_t(src) * mFUnitsConvFactor
|
|
|
|
gfxFontEntry::AutoTable os2Table(mFontEntry, kOS_2TableTag);
|
|
if (os2Table && mFUnitsConvFactor >= 0.0) {
|
|
const OS2Table *os2 =
|
|
reinterpret_cast<const OS2Table*>(hb_blob_get_data(os2Table, &len));
|
|
// These fields should always be present in any valid OS/2 table
|
|
if (len >= offsetof(OS2Table, sTypoLineGap) + sizeof(int16_t)) {
|
|
SET_SIGNED(strikeoutSize, os2->yStrikeoutSize);
|
|
// Use ascent+descent from the horizontal metrics as the default
|
|
// advance (aveCharWidth) in vertical mode
|
|
gfxFloat ascentDescent = gfxFloat(mFUnitsConvFactor) *
|
|
(int16_t(os2->sTypoAscender) - int16_t(os2->sTypoDescender));
|
|
metrics->aveCharWidth =
|
|
std::max(metrics->emHeight, ascentDescent);
|
|
// Use xAvgCharWidth from horizontal metrics as minimum font extent
|
|
// for vertical layout, applying half of it to ascent and half to
|
|
// descent (to work with a default centered baseline).
|
|
gfxFloat halfCharWidth =
|
|
int16_t(os2->xAvgCharWidth) * gfxFloat(mFUnitsConvFactor) / 2;
|
|
metrics->maxAscent = std::max(metrics->maxAscent, halfCharWidth);
|
|
metrics->maxDescent = std::max(metrics->maxDescent, halfCharWidth);
|
|
}
|
|
}
|
|
|
|
// If we didn't set aveCharWidth from OS/2, try to read 'hhea' metrics
|
|
// and use the line height from its ascent/descent.
|
|
if (!metrics->aveCharWidth) {
|
|
gfxFontEntry::AutoTable hheaTable(mFontEntry, kHheaTableTag);
|
|
if (hheaTable && mFUnitsConvFactor >= 0.0) {
|
|
const MetricsHeader* hhea =
|
|
reinterpret_cast<const MetricsHeader*>
|
|
(hb_blob_get_data(hheaTable, &len));
|
|
if (len >= sizeof(MetricsHeader)) {
|
|
SET_SIGNED(aveCharWidth, int16_t(hhea->ascender) -
|
|
int16_t(hhea->descender));
|
|
metrics->maxAscent = metrics->aveCharWidth / 2;
|
|
metrics->maxDescent =
|
|
metrics->aveCharWidth - metrics->maxAscent;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Read real vertical metrics if available.
|
|
gfxFontEntry::AutoTable vheaTable(mFontEntry, kVheaTableTag);
|
|
if (vheaTable && mFUnitsConvFactor >= 0.0) {
|
|
const MetricsHeader* vhea =
|
|
reinterpret_cast<const MetricsHeader*>
|
|
(hb_blob_get_data(vheaTable, &len));
|
|
if (len >= sizeof(MetricsHeader)) {
|
|
SET_UNSIGNED(maxAdvance, vhea->advanceWidthMax);
|
|
// Redistribute space between ascent/descent because we want a
|
|
// centered vertical baseline by default.
|
|
gfxFloat halfExtent = 0.5 * gfxFloat(mFUnitsConvFactor) *
|
|
(int16_t(vhea->ascender) + std::abs(int16_t(vhea->descender)));
|
|
// Some bogus fonts have ascent and descent set to zero in 'vhea'.
|
|
// In that case we just ignore them and keep our synthetic values
|
|
// from above.
|
|
if (halfExtent > 0) {
|
|
metrics->maxAscent = halfExtent;
|
|
metrics->maxDescent = halfExtent;
|
|
SET_SIGNED(externalLeading, vhea->lineGap);
|
|
}
|
|
}
|
|
}
|
|
|
|
// If we didn't set aveCharWidth above, we must be dealing with a non-sfnt
|
|
// font of some kind (Type1, bitmap, vector, ...), so fall back to using
|
|
// whatever the platform backend figured out for horizontal layout.
|
|
// And if we haven't set externalLeading yet, then copy that from the
|
|
// horizontal metrics as well, to help consistency of CSS line-height.
|
|
if (!metrics->aveCharWidth ||
|
|
metrics->externalLeading == UNINITIALIZED_LEADING) {
|
|
const Metrics& horizMetrics = GetHorizontalMetrics();
|
|
if (!metrics->aveCharWidth) {
|
|
metrics->aveCharWidth = horizMetrics.maxAscent + horizMetrics.maxDescent;
|
|
}
|
|
if (metrics->externalLeading == UNINITIALIZED_LEADING) {
|
|
metrics->externalLeading = horizMetrics.externalLeading;
|
|
}
|
|
}
|
|
|
|
// Get underline thickness from the 'post' table if available.
|
|
gfxFontEntry::AutoTable postTable(mFontEntry, kPostTableTag);
|
|
if (postTable) {
|
|
const PostTable *post =
|
|
reinterpret_cast<const PostTable*>(hb_blob_get_data(postTable,
|
|
&len));
|
|
if (len >= offsetof(PostTable, underlineThickness) +
|
|
sizeof(uint16_t)) {
|
|
SET_UNSIGNED(underlineSize, post->underlineThickness);
|
|
// Also use for strikeout if we didn't find that in OS/2 above.
|
|
if (!metrics->strikeoutSize) {
|
|
metrics->strikeoutSize = metrics->underlineSize;
|
|
}
|
|
}
|
|
}
|
|
|
|
#undef SET_UNSIGNED
|
|
#undef SET_SIGNED
|
|
|
|
// If we didn't read this from a vhea table, it will still be zero.
|
|
// In any case, let's make sure it is not less than the value we've
|
|
// come up with for aveCharWidth.
|
|
metrics->maxAdvance = std::max(metrics->maxAdvance, metrics->aveCharWidth);
|
|
|
|
// Thickness of underline and strikeout may have been read from tables,
|
|
// but in case they were not present, ensure a minimum of 1 pixel.
|
|
// We synthesize our own positions, as font metrics don't provide these
|
|
// for vertical layout.
|
|
metrics->underlineSize = std::max(1.0, metrics->underlineSize);
|
|
metrics->underlineOffset = - metrics->maxDescent - metrics->underlineSize;
|
|
|
|
metrics->strikeoutSize = std::max(1.0, metrics->strikeoutSize);
|
|
metrics->strikeoutOffset = - 0.5 * metrics->strikeoutSize;
|
|
|
|
// Somewhat arbitrary values for now, subject to future refinement...
|
|
metrics->spaceWidth = metrics->aveCharWidth;
|
|
metrics->zeroOrAveCharWidth = metrics->aveCharWidth;
|
|
metrics->maxHeight = metrics->maxAscent + metrics->maxDescent;
|
|
metrics->xHeight = metrics->emHeight / 2;
|
|
metrics->capHeight = metrics->maxAscent;
|
|
|
|
return metrics;
|
|
}
|
|
|
|
gfxFloat
|
|
gfxFont::SynthesizeSpaceWidth(uint32_t aCh)
|
|
{
|
|
// return an appropriate width for various Unicode space characters
|
|
// that we "fake" if they're not actually present in the font;
|
|
// returns negative value if the char is not a known space.
|
|
switch (aCh) {
|
|
case 0x2000: // en quad
|
|
case 0x2002: return GetAdjustedSize() / 2; // en space
|
|
case 0x2001: // em quad
|
|
case 0x2003: return GetAdjustedSize(); // em space
|
|
case 0x2004: return GetAdjustedSize() / 3; // three-per-em space
|
|
case 0x2005: return GetAdjustedSize() / 4; // four-per-em space
|
|
case 0x2006: return GetAdjustedSize() / 6; // six-per-em space
|
|
case 0x2007: return GetMetrics(eHorizontal).zeroOrAveCharWidth; // figure space
|
|
case 0x2008: return GetMetrics(eHorizontal).spaceWidth; // punctuation space
|
|
case 0x2009: return GetAdjustedSize() / 5; // thin space
|
|
case 0x200a: return GetAdjustedSize() / 10; // hair space
|
|
case 0x202f: return GetAdjustedSize() / 5; // narrow no-break space
|
|
default: return -1.0;
|
|
}
|
|
}
|
|
|
|
void
|
|
gfxFont::AddSizeOfExcludingThis(MallocSizeOf aMallocSizeOf,
|
|
FontCacheSizes* aSizes) const
|
|
{
|
|
for (uint32_t i = 0; i < mGlyphExtentsArray.Length(); ++i) {
|
|
aSizes->mFontInstances +=
|
|
mGlyphExtentsArray[i]->SizeOfIncludingThis(aMallocSizeOf);
|
|
}
|
|
if (mWordCache) {
|
|
aSizes->mShapedWords += mWordCache->SizeOfIncludingThis(aMallocSizeOf);
|
|
}
|
|
}
|
|
|
|
void
|
|
gfxFont::AddSizeOfIncludingThis(MallocSizeOf aMallocSizeOf,
|
|
FontCacheSizes* aSizes) const
|
|
{
|
|
aSizes->mFontInstances += aMallocSizeOf(this);
|
|
AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
|
|
}
|
|
|
|
void
|
|
gfxFont::AddGlyphChangeObserver(GlyphChangeObserver *aObserver)
|
|
{
|
|
if (!mGlyphChangeObservers) {
|
|
mGlyphChangeObservers.reset(
|
|
new nsTHashtable<nsPtrHashKey<GlyphChangeObserver>>);
|
|
}
|
|
mGlyphChangeObservers->PutEntry(aObserver);
|
|
}
|
|
|
|
void
|
|
gfxFont::RemoveGlyphChangeObserver(GlyphChangeObserver *aObserver)
|
|
{
|
|
NS_ASSERTION(mGlyphChangeObservers, "No observers registered");
|
|
NS_ASSERTION(mGlyphChangeObservers->Contains(aObserver), "Observer not registered");
|
|
mGlyphChangeObservers->RemoveEntry(aObserver);
|
|
}
|
|
|
|
|
|
#define DEFAULT_PIXEL_FONT_SIZE 16.0f
|
|
|
|
/*static*/ uint32_t
|
|
gfxFontStyle::ParseFontLanguageOverride(const nsString& aLangTag)
|
|
{
|
|
if (!aLangTag.Length() || aLangTag.Length() > 4) {
|
|
return NO_FONT_LANGUAGE_OVERRIDE;
|
|
}
|
|
uint32_t index, result = 0;
|
|
for (index = 0; index < aLangTag.Length(); ++index) {
|
|
char16_t ch = aLangTag[index];
|
|
if (!nsCRT::IsAscii(ch)) { // valid tags are pure ASCII
|
|
return NO_FONT_LANGUAGE_OVERRIDE;
|
|
}
|
|
result = (result << 8) + ch;
|
|
}
|
|
while (index++ < 4) {
|
|
result = (result << 8) + 0x20;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
gfxFontStyle::gfxFontStyle() :
|
|
language(nsGkAtoms::x_western),
|
|
size(DEFAULT_PIXEL_FONT_SIZE), sizeAdjust(-1.0f), baselineOffset(0.0f),
|
|
languageOverride(NO_FONT_LANGUAGE_OVERRIDE),
|
|
weight(NS_FONT_WEIGHT_NORMAL), stretch(NS_FONT_STRETCH_NORMAL),
|
|
systemFont(true), printerFont(false), useGrayscaleAntialiasing(false),
|
|
style(NS_FONT_STYLE_NORMAL),
|
|
allowSyntheticWeight(true), allowSyntheticStyle(true),
|
|
noFallbackVariantFeatures(true),
|
|
explicitLanguage(false),
|
|
variantCaps(NS_FONT_VARIANT_CAPS_NORMAL),
|
|
variantSubSuper(NS_FONT_VARIANT_POSITION_NORMAL)
|
|
{
|
|
}
|
|
|
|
gfxFontStyle::gfxFontStyle(uint8_t aStyle, uint16_t aWeight, int16_t aStretch,
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gfxFloat aSize,
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nsIAtom *aLanguage, bool aExplicitLanguage,
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float aSizeAdjust, bool aSystemFont,
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bool aPrinterFont,
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bool aAllowWeightSynthesis,
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bool aAllowStyleSynthesis,
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const nsString& aLanguageOverride):
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language(aLanguage),
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size(aSize), sizeAdjust(aSizeAdjust), baselineOffset(0.0f),
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languageOverride(ParseFontLanguageOverride(aLanguageOverride)),
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weight(aWeight), stretch(aStretch),
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systemFont(aSystemFont), printerFont(aPrinterFont),
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useGrayscaleAntialiasing(false),
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style(aStyle),
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allowSyntheticWeight(aAllowWeightSynthesis),
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allowSyntheticStyle(aAllowStyleSynthesis),
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noFallbackVariantFeatures(true),
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explicitLanguage(aExplicitLanguage),
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variantCaps(NS_FONT_VARIANT_CAPS_NORMAL),
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variantSubSuper(NS_FONT_VARIANT_POSITION_NORMAL)
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{
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MOZ_ASSERT(!mozilla::IsNaN(size));
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MOZ_ASSERT(!mozilla::IsNaN(sizeAdjust));
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if (weight > 900)
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weight = 900;
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if (weight < 100)
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weight = 100;
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if (size >= FONT_MAX_SIZE) {
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size = FONT_MAX_SIZE;
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sizeAdjust = -1.0f;
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} else if (size < 0.0) {
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NS_WARNING("negative font size");
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size = 0.0;
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}
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if (!language) {
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NS_WARNING("null language");
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language = nsGkAtoms::x_western;
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}
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}
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gfxFontStyle::gfxFontStyle(const gfxFontStyle& aStyle) :
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language(aStyle.language),
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featureValueLookup(aStyle.featureValueLookup),
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size(aStyle.size), sizeAdjust(aStyle.sizeAdjust),
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baselineOffset(aStyle.baselineOffset),
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languageOverride(aStyle.languageOverride),
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weight(aStyle.weight), stretch(aStyle.stretch),
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systemFont(aStyle.systemFont), printerFont(aStyle.printerFont),
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useGrayscaleAntialiasing(aStyle.useGrayscaleAntialiasing),
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style(aStyle.style),
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allowSyntheticWeight(aStyle.allowSyntheticWeight),
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allowSyntheticStyle(aStyle.allowSyntheticStyle),
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noFallbackVariantFeatures(aStyle.noFallbackVariantFeatures),
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explicitLanguage(aStyle.explicitLanguage),
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variantCaps(aStyle.variantCaps),
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variantSubSuper(aStyle.variantSubSuper)
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{
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featureSettings.AppendElements(aStyle.featureSettings);
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alternateValues.AppendElements(aStyle.alternateValues);
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}
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int8_t
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gfxFontStyle::ComputeWeight() const
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{
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int8_t baseWeight = (weight + 50) / 100;
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if (baseWeight < 0)
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baseWeight = 0;
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if (baseWeight > 9)
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baseWeight = 9;
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return baseWeight;
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}
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void
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gfxFontStyle::AdjustForSubSuperscript(int32_t aAppUnitsPerDevPixel)
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{
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NS_PRECONDITION(variantSubSuper != NS_FONT_VARIANT_POSITION_NORMAL &&
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baselineOffset == 0,
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"can't adjust this style for sub/superscript");
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// calculate the baseline offset (before changing the size)
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if (variantSubSuper == NS_FONT_VARIANT_POSITION_SUPER) {
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baselineOffset = size * -NS_FONT_SUPERSCRIPT_OFFSET_RATIO;
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} else {
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baselineOffset = size * NS_FONT_SUBSCRIPT_OFFSET_RATIO;
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}
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// calculate reduced size, roughly mimicing behavior of font-size: smaller
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float cssSize = size * aAppUnitsPerDevPixel / AppUnitsPerCSSPixel();
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if (cssSize < NS_FONT_SUB_SUPER_SMALL_SIZE) {
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size *= NS_FONT_SUB_SUPER_SIZE_RATIO_SMALL;
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} else if (cssSize >= NS_FONT_SUB_SUPER_LARGE_SIZE) {
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size *= NS_FONT_SUB_SUPER_SIZE_RATIO_LARGE;
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} else {
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gfxFloat t = (cssSize - NS_FONT_SUB_SUPER_SMALL_SIZE) /
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(NS_FONT_SUB_SUPER_LARGE_SIZE -
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NS_FONT_SUB_SUPER_SMALL_SIZE);
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size *= (1.0 - t) * NS_FONT_SUB_SUPER_SIZE_RATIO_SMALL +
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t * NS_FONT_SUB_SUPER_SIZE_RATIO_LARGE;
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}
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// clear the variant field
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variantSubSuper = NS_FONT_VARIANT_POSITION_NORMAL;
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}
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bool
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gfxFont::TryGetMathTable()
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{
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if (!mMathInitialized) {
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mMathInitialized = true;
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hb_face_t *face = GetFontEntry()->GetHBFace();
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if (face) {
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if (hb_ot_math_has_data(face)) {
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mMathTable = MakeUnique<gfxMathTable>(face, GetAdjustedSize());
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}
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hb_face_destroy(face);
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}
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}
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return !!mMathTable;
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}
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