565 lines
21 KiB
C++
565 lines
21 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 "gfxGDIFont.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/Sprintf.h"
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#include "mozilla/WindowsVersion.h"
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#include <algorithm>
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#include "gfxWindowsPlatform.h"
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#include "gfxContext.h"
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#include "mozilla/Preferences.h"
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#include "nsUnicodeProperties.h"
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#include "gfxFontConstants.h"
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#include "gfxTextRun.h"
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#include "cairo-win32.h"
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#define ROUND(x) floor((x) + 0.5)
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using namespace mozilla;
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using namespace mozilla::unicode;
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static inline cairo_antialias_t
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GetCairoAntialiasOption(gfxFont::AntialiasOption anAntialiasOption)
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{
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switch (anAntialiasOption) {
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default:
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case gfxFont::kAntialiasDefault:
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return CAIRO_ANTIALIAS_DEFAULT;
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case gfxFont::kAntialiasNone:
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return CAIRO_ANTIALIAS_NONE;
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case gfxFont::kAntialiasGrayscale:
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return CAIRO_ANTIALIAS_GRAY;
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case gfxFont::kAntialiasSubpixel:
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return CAIRO_ANTIALIAS_SUBPIXEL;
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}
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}
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gfxGDIFont::gfxGDIFont(GDIFontEntry *aFontEntry,
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const gfxFontStyle *aFontStyle,
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bool aNeedsBold,
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AntialiasOption anAAOption)
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: gfxFont(aFontEntry, aFontStyle, anAAOption),
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mFont(nullptr),
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mFontFace(nullptr),
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mMetrics(nullptr),
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mSpaceGlyph(0),
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mNeedsBold(aNeedsBold),
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mScriptCache(nullptr)
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{
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Initialize();
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}
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gfxGDIFont::~gfxGDIFont()
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{
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if (mScaledFont) {
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cairo_scaled_font_destroy(mScaledFont);
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}
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if (mFontFace) {
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cairo_font_face_destroy(mFontFace);
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}
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if (mFont) {
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::DeleteObject(mFont);
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}
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if (mScriptCache) {
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ScriptFreeCache(&mScriptCache);
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}
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delete mMetrics;
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}
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gfxFont*
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gfxGDIFont::CopyWithAntialiasOption(AntialiasOption anAAOption)
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{
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return new gfxGDIFont(static_cast<GDIFontEntry*>(mFontEntry.get()),
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&mStyle, mNeedsBold, anAAOption);
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}
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bool
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gfxGDIFont::ShapeText(DrawTarget *aDrawTarget,
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const char16_t *aText,
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uint32_t aOffset,
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uint32_t aLength,
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Script aScript,
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bool aVertical,
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gfxShapedText *aShapedText)
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{
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if (!mIsValid) {
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NS_WARNING("invalid font! expect incorrect text rendering");
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return false;
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}
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// Ensure the cairo font is set up, so there's no risk it'll fall back to
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// creating a "toy" font internally (see bug 544617).
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// We must check that this succeeded, otherwise we risk cairo creating the
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// wrong kind of font internally as a fallback (bug 744480).
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if (!SetupCairoFont(aDrawTarget)) {
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return false;
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}
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return gfxFont::ShapeText(aDrawTarget, aText, aOffset, aLength, aScript,
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aVertical, aShapedText);
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}
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const gfxFont::Metrics&
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gfxGDIFont::GetHorizontalMetrics()
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{
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return *mMetrics;
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}
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uint32_t
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gfxGDIFont::GetSpaceGlyph()
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{
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return mSpaceGlyph;
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}
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bool
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gfxGDIFont::SetupCairoFont(DrawTarget* aDrawTarget)
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{
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if (!mScaledFont ||
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cairo_scaled_font_status(mScaledFont) != CAIRO_STATUS_SUCCESS) {
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// Don't cairo_set_scaled_font as that would propagate the error to
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// the cairo_t, precluding any further drawing.
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return false;
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}
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cairo_set_scaled_font(gfxFont::RefCairo(aDrawTarget), mScaledFont);
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return true;
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}
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gfxFont::RunMetrics
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gfxGDIFont::Measure(const gfxTextRun *aTextRun,
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uint32_t aStart, uint32_t aEnd,
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BoundingBoxType aBoundingBoxType,
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DrawTarget *aRefDrawTarget,
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Spacing *aSpacing,
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uint16_t aOrientation)
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{
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gfxFont::RunMetrics metrics =
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gfxFont::Measure(aTextRun, aStart, aEnd, aBoundingBoxType,
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aRefDrawTarget, aSpacing, aOrientation);
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// if aBoundingBoxType is LOOSE_INK_EXTENTS
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// and the underlying cairo font may be antialiased,
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// we can't trust Windows to have considered all the pixels
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// so we need to add "padding" to the bounds.
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// (see bugs 475968, 439831, compare also bug 445087)
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if (aBoundingBoxType == LOOSE_INK_EXTENTS &&
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mAntialiasOption != kAntialiasNone &&
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metrics.mBoundingBox.width > 0) {
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metrics.mBoundingBox.x -= aTextRun->GetAppUnitsPerDevUnit();
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metrics.mBoundingBox.width += aTextRun->GetAppUnitsPerDevUnit() * 3;
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}
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return metrics;
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}
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void
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gfxGDIFont::Initialize()
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{
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NS_ASSERTION(!mMetrics, "re-creating metrics? this will leak");
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LOGFONTW logFont;
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// Figure out if we want to do synthetic oblique styling.
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GDIFontEntry* fe = static_cast<GDIFontEntry*>(GetFontEntry());
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bool wantFakeItalic = mStyle.style != NS_FONT_STYLE_NORMAL &&
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fe->IsUpright() && mStyle.allowSyntheticStyle;
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// If the font's family has an actual italic face (but font matching
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// didn't choose it), we have to use a cairo transform instead of asking
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// GDI to italicize, because that would use a different face and result
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// in a possible glyph ID mismatch between shaping and rendering.
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//
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// We use the mFamilyHasItalicFace flag in the entry in case of user fonts,
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// where the *CSS* family may not know about italic faces that are present
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// in the *GDI* family, and which GDI would use if we asked it to perform
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// the "italicization".
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bool useCairoFakeItalic = wantFakeItalic && fe->mFamilyHasItalicFace;
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if (mAdjustedSize == 0.0) {
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mAdjustedSize = mStyle.size;
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if (mStyle.sizeAdjust > 0.0 && mAdjustedSize > 0.0) {
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// to implement font-size-adjust, we first create the "unadjusted" font
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FillLogFont(logFont, mAdjustedSize,
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wantFakeItalic && !useCairoFakeItalic);
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mFont = ::CreateFontIndirectW(&logFont);
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// initialize its metrics so we can calculate size adjustment
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Initialize();
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// Unless the font was so small that GDI metrics rounded to zero,
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// calculate the properly adjusted size, and then proceed
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// to recreate mFont and recalculate metrics
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if (mMetrics->xHeight > 0.0 && mMetrics->emHeight > 0.0) {
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gfxFloat aspect = mMetrics->xHeight / mMetrics->emHeight;
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mAdjustedSize = mStyle.GetAdjustedSize(aspect);
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}
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// delete the temporary font and metrics
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::DeleteObject(mFont);
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mFont = nullptr;
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delete mMetrics;
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mMetrics = nullptr;
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} else if (mStyle.sizeAdjust == 0.0) {
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mAdjustedSize = 0.0;
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}
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}
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// (bug 724231) for local user fonts, we don't use GDI's synthetic bold,
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// as it could lead to a different, incompatible face being used
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// but instead do our own multi-striking
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if (mNeedsBold && GetFontEntry()->IsLocalUserFont()) {
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mApplySyntheticBold = true;
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}
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// this may end up being zero
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mAdjustedSize = ROUND(mAdjustedSize);
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FillLogFont(logFont, mAdjustedSize, wantFakeItalic && !useCairoFakeItalic);
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mFont = ::CreateFontIndirectW(&logFont);
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mMetrics = new gfxFont::Metrics;
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::memset(mMetrics, 0, sizeof(*mMetrics));
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AutoDC dc;
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SetGraphicsMode(dc.GetDC(), GM_ADVANCED);
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AutoSelectFont selectFont(dc.GetDC(), mFont);
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// Get font metrics if size > 0
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if (mAdjustedSize > 0.0) {
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OUTLINETEXTMETRIC oMetrics;
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TEXTMETRIC& metrics = oMetrics.otmTextMetrics;
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if (0 < GetOutlineTextMetrics(dc.GetDC(), sizeof(oMetrics), &oMetrics)) {
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mMetrics->strikeoutSize = (double)oMetrics.otmsStrikeoutSize;
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mMetrics->strikeoutOffset = (double)oMetrics.otmsStrikeoutPosition;
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mMetrics->underlineSize = (double)oMetrics.otmsUnderscoreSize;
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mMetrics->underlineOffset = (double)oMetrics.otmsUnderscorePosition;
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const MAT2 kIdentityMatrix = { {0, 1}, {0, 0}, {0, 0}, {0, 1} };
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GLYPHMETRICS gm;
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DWORD len = GetGlyphOutlineW(dc.GetDC(), char16_t('x'), GGO_METRICS, &gm, 0, nullptr, &kIdentityMatrix);
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if (len == GDI_ERROR || gm.gmptGlyphOrigin.y <= 0) {
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// 56% of ascent, best guess for true type
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mMetrics->xHeight =
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ROUND((double)metrics.tmAscent * DEFAULT_XHEIGHT_FACTOR);
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} else {
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mMetrics->xHeight = gm.gmptGlyphOrigin.y;
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}
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len = GetGlyphOutlineW(dc.GetDC(), char16_t('H'), GGO_METRICS, &gm, 0, nullptr, &kIdentityMatrix);
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if (len == GDI_ERROR || gm.gmptGlyphOrigin.y <= 0) {
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mMetrics->capHeight = metrics.tmAscent - metrics.tmInternalLeading;
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} else {
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mMetrics->capHeight = gm.gmptGlyphOrigin.y;
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}
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mMetrics->emHeight = metrics.tmHeight - metrics.tmInternalLeading;
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gfxFloat typEmHeight = (double)oMetrics.otmAscent - (double)oMetrics.otmDescent;
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mMetrics->emAscent = ROUND(mMetrics->emHeight * (double)oMetrics.otmAscent / typEmHeight);
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mMetrics->emDescent = mMetrics->emHeight - mMetrics->emAscent;
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if (oMetrics.otmEMSquare > 0) {
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mFUnitsConvFactor = float(mAdjustedSize / oMetrics.otmEMSquare);
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}
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} else {
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// Make a best-effort guess at extended metrics
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// this is based on general typographic guidelines
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// GetTextMetrics can fail if the font file has been removed
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// or corrupted recently.
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BOOL result = GetTextMetrics(dc.GetDC(), &metrics);
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if (!result) {
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NS_WARNING("Missing or corrupt font data, fasten your seatbelt");
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mIsValid = false;
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memset(mMetrics, 0, sizeof(*mMetrics));
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return;
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}
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mMetrics->xHeight =
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ROUND((float)metrics.tmAscent * DEFAULT_XHEIGHT_FACTOR);
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mMetrics->strikeoutSize = 1;
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mMetrics->strikeoutOffset = ROUND(mMetrics->xHeight * 0.5f); // 50% of xHeight
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mMetrics->underlineSize = 1;
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mMetrics->underlineOffset = -ROUND((float)metrics.tmDescent * 0.30f); // 30% of descent
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mMetrics->emHeight = metrics.tmHeight - metrics.tmInternalLeading;
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mMetrics->emAscent = metrics.tmAscent - metrics.tmInternalLeading;
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mMetrics->emDescent = metrics.tmDescent;
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mMetrics->capHeight = mMetrics->emAscent;
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}
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mMetrics->internalLeading = metrics.tmInternalLeading;
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mMetrics->externalLeading = metrics.tmExternalLeading;
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mMetrics->maxHeight = metrics.tmHeight;
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mMetrics->maxAscent = metrics.tmAscent;
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mMetrics->maxDescent = metrics.tmDescent;
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mMetrics->maxAdvance = metrics.tmMaxCharWidth;
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mMetrics->aveCharWidth = std::max<gfxFloat>(1, metrics.tmAveCharWidth);
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// The font is monospace when TMPF_FIXED_PITCH is *not* set!
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// See http://msdn2.microsoft.com/en-us/library/ms534202(VS.85).aspx
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if (!(metrics.tmPitchAndFamily & TMPF_FIXED_PITCH)) {
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mMetrics->maxAdvance = mMetrics->aveCharWidth;
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}
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// For fonts with USE_TYPO_METRICS set in the fsSelection field,
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// let the OS/2 sTypo* metrics override the previous values.
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// (see http://www.microsoft.com/typography/otspec/os2.htm#fss)
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// Using the equivalent values from oMetrics provides inconsistent
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// results with CFF fonts, so we instead rely on OS2Table.
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gfxFontEntry::AutoTable os2Table(mFontEntry,
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TRUETYPE_TAG('O','S','/','2'));
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if (os2Table) {
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uint32_t len;
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const OS2Table *os2 =
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reinterpret_cast<const OS2Table*>(hb_blob_get_data(os2Table,
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&len));
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if (len >= offsetof(OS2Table, sTypoLineGap) + sizeof(int16_t)) {
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const uint16_t kUseTypoMetricsMask = 1 << 7;
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if ((uint16_t(os2->fsSelection) & kUseTypoMetricsMask)) {
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double ascent = int16_t(os2->sTypoAscender);
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double descent = int16_t(os2->sTypoDescender);
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double lineGap = int16_t(os2->sTypoLineGap);
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mMetrics->maxAscent = ROUND(ascent * mFUnitsConvFactor);
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mMetrics->maxDescent = -ROUND(descent * mFUnitsConvFactor);
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mMetrics->maxHeight =
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mMetrics->maxAscent + mMetrics->maxDescent;
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mMetrics->internalLeading =
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mMetrics->maxHeight - mMetrics->emHeight;
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gfxFloat lineHeight =
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ROUND((ascent - descent + lineGap) * mFUnitsConvFactor);
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lineHeight = std::max(lineHeight, mMetrics->maxHeight);
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mMetrics->externalLeading =
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lineHeight - mMetrics->maxHeight;
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}
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}
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// although sxHeight and sCapHeight are signed fields, we consider
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// negative values to be erroneous and just ignore them
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if (uint16_t(os2->version) >= 2) {
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// version 2 and later includes the x-height and cap-height fields
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if (len >= offsetof(OS2Table, sxHeight) + sizeof(int16_t) &&
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int16_t(os2->sxHeight) > 0) {
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mMetrics->xHeight = ROUND(int16_t(os2->sxHeight) * mFUnitsConvFactor);
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}
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if (len >= offsetof(OS2Table, sCapHeight) + sizeof(int16_t) &&
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int16_t(os2->sCapHeight) > 0) {
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mMetrics->capHeight = ROUND(int16_t(os2->sCapHeight) * mFUnitsConvFactor);
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}
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}
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}
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WORD glyph;
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SIZE size;
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DWORD ret = GetGlyphIndicesW(dc.GetDC(), L" ", 1, &glyph,
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GGI_MARK_NONEXISTING_GLYPHS);
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if (ret != GDI_ERROR && glyph != 0xFFFF) {
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mSpaceGlyph = glyph;
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// Cache the width of a single space.
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GetTextExtentPoint32W(dc.GetDC(), L" ", 1, &size);
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mMetrics->spaceWidth = ROUND(size.cx);
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} else {
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mMetrics->spaceWidth = mMetrics->aveCharWidth;
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}
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// Cache the width of digit zero, if available.
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ret = GetGlyphIndicesW(dc.GetDC(), L"0", 1, &glyph,
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GGI_MARK_NONEXISTING_GLYPHS);
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if (ret != GDI_ERROR && glyph != 0xFFFF) {
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GetTextExtentPoint32W(dc.GetDC(), L"0", 1, &size);
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mMetrics->zeroOrAveCharWidth = ROUND(size.cx);
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} else {
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mMetrics->zeroOrAveCharWidth = mMetrics->aveCharWidth;
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}
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SanitizeMetrics(mMetrics, GetFontEntry()->mIsBadUnderlineFont);
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} else {
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mFUnitsConvFactor = 0.0; // zero-sized font: all values scale to zero
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}
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if (IsSyntheticBold()) {
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mMetrics->aveCharWidth += GetSyntheticBoldOffset();
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mMetrics->maxAdvance += GetSyntheticBoldOffset();
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}
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mFontFace = cairo_win32_font_face_create_for_logfontw_hfont(&logFont,
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mFont);
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cairo_matrix_t sizeMatrix, ctm;
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cairo_matrix_init_identity(&ctm);
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cairo_matrix_init_scale(&sizeMatrix, mAdjustedSize, mAdjustedSize);
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if (useCairoFakeItalic) {
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// Skew the matrix to do fake italic if it wasn't already applied
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// via the LOGFONT
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double skewfactor = OBLIQUE_SKEW_FACTOR;
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cairo_matrix_t style;
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cairo_matrix_init(&style,
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1, //xx
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0, //yx
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-1 * skewfactor, //xy
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1, //yy
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0, //x0
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0); //y0
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cairo_matrix_multiply(&sizeMatrix, &sizeMatrix, &style);
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}
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cairo_font_options_t *fontOptions = cairo_font_options_create();
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if (mAntialiasOption != kAntialiasDefault) {
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cairo_font_options_set_antialias(fontOptions,
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GetCairoAntialiasOption(mAntialiasOption));
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}
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mScaledFont = cairo_scaled_font_create(mFontFace, &sizeMatrix,
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&ctm, fontOptions);
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cairo_font_options_destroy(fontOptions);
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if (!mScaledFont ||
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cairo_scaled_font_status(mScaledFont) != CAIRO_STATUS_SUCCESS) {
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#ifdef DEBUG
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char warnBuf[1024];
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SprintfLiteral(warnBuf, "Failed to create scaled font: %s status: %d",
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NS_ConvertUTF16toUTF8(mFontEntry->Name()).get(),
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mScaledFont ? cairo_scaled_font_status(mScaledFont) : 0);
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NS_WARNING(warnBuf);
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#endif
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mIsValid = false;
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} else {
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mIsValid = true;
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}
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#if 0
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printf("Font: %p (%s) size: %f adjusted size: %f valid: %s\n", this,
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NS_ConvertUTF16toUTF8(GetName()).get(), mStyle.size, mAdjustedSize, (mIsValid ? "yes" : "no"));
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printf(" emHeight: %f emAscent: %f emDescent: %f\n", mMetrics->emHeight, mMetrics->emAscent, mMetrics->emDescent);
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printf(" maxAscent: %f maxDescent: %f maxAdvance: %f\n", mMetrics->maxAscent, mMetrics->maxDescent, mMetrics->maxAdvance);
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printf(" internalLeading: %f externalLeading: %f\n", mMetrics->internalLeading, mMetrics->externalLeading);
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printf(" spaceWidth: %f aveCharWidth: %f\n", mMetrics->spaceWidth, mMetrics->aveCharWidth);
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printf(" xHeight: %f capHeight: %f\n", mMetrics->xHeight, mMetrics->capHeight);
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printf(" uOff: %f uSize: %f stOff: %f stSize: %f\n",
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mMetrics->underlineOffset, mMetrics->underlineSize, mMetrics->strikeoutOffset, mMetrics->strikeoutSize);
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|
#endif
|
|
}
|
|
|
|
void
|
|
gfxGDIFont::FillLogFont(LOGFONTW& aLogFont, gfxFloat aSize,
|
|
bool aUseGDIFakeItalic)
|
|
{
|
|
GDIFontEntry *fe = static_cast<GDIFontEntry*>(GetFontEntry());
|
|
|
|
uint16_t weight;
|
|
if (fe->IsUserFont()) {
|
|
if (fe->IsLocalUserFont()) {
|
|
// for local user fonts, don't change the original weight
|
|
// in the entry's logfont, because that could alter the
|
|
// choice of actual face used (bug 724231)
|
|
weight = 0;
|
|
} else {
|
|
// avoid GDI synthetic bold which occurs when weight
|
|
// specified is >= font data weight + 200
|
|
weight = mNeedsBold ? 700 : 200;
|
|
}
|
|
} else {
|
|
weight = mNeedsBold ? 700 : fe->Weight();
|
|
}
|
|
|
|
fe->FillLogFont(&aLogFont, weight, aSize,
|
|
(mAntialiasOption == kAntialiasSubpixel) ? true : false);
|
|
|
|
// If GDI synthetic italic is wanted, force the lfItalic field to true
|
|
if (aUseGDIFakeItalic) {
|
|
aLogFont.lfItalic = 1;
|
|
}
|
|
}
|
|
|
|
uint32_t
|
|
gfxGDIFont::GetGlyph(uint32_t aUnicode, uint32_t aVarSelector)
|
|
{
|
|
// Callback used only for fonts that lack a 'cmap' table.
|
|
|
|
// We don't support variation selector sequences or non-BMP characters
|
|
// in the legacy bitmap, vector or postscript fonts that might use
|
|
// this code path.
|
|
if (aUnicode > 0xffff || aVarSelector) {
|
|
return 0;
|
|
}
|
|
|
|
if (!mGlyphIDs) {
|
|
mGlyphIDs = MakeUnique<nsDataHashtable<nsUint32HashKey,uint32_t>>(64);
|
|
}
|
|
|
|
uint32_t gid;
|
|
if (mGlyphIDs->Get(aUnicode, &gid)) {
|
|
return gid;
|
|
}
|
|
|
|
wchar_t ch = aUnicode;
|
|
WORD glyph;
|
|
DWORD ret = ScriptGetCMap(nullptr, &mScriptCache, &ch, 1, 0, &glyph);
|
|
if (ret != S_OK) {
|
|
AutoDC dc;
|
|
AutoSelectFont fs(dc.GetDC(), GetHFONT());
|
|
if (ret == E_PENDING) {
|
|
// Try ScriptGetCMap again now that we've set up the font.
|
|
ret = ScriptGetCMap(dc.GetDC(), &mScriptCache, &ch, 1, 0, &glyph);
|
|
}
|
|
if (ret != S_OK) {
|
|
// If ScriptGetCMap still failed, fall back to GetGlyphIndicesW
|
|
// (see bug 1105807).
|
|
ret = GetGlyphIndicesW(dc.GetDC(), &ch, 1, &glyph,
|
|
GGI_MARK_NONEXISTING_GLYPHS);
|
|
if (ret == GDI_ERROR || glyph == 0xFFFF) {
|
|
glyph = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
mGlyphIDs->Put(aUnicode, glyph);
|
|
return glyph;
|
|
}
|
|
|
|
int32_t
|
|
gfxGDIFont::GetGlyphWidth(DrawTarget& aDrawTarget, uint16_t aGID)
|
|
{
|
|
if (!mGlyphWidths) {
|
|
mGlyphWidths = MakeUnique<nsDataHashtable<nsUint32HashKey,int32_t>>(128);
|
|
}
|
|
|
|
int32_t width;
|
|
if (mGlyphWidths->Get(aGID, &width)) {
|
|
return width;
|
|
}
|
|
|
|
DCFromDrawTarget dc(aDrawTarget);
|
|
AutoSelectFont fs(dc, GetHFONT());
|
|
|
|
int devWidth;
|
|
if (GetCharWidthI(dc, aGID, 1, nullptr, &devWidth)) {
|
|
// clamp value to range [0..0x7fff], and convert to 16.16 fixed-point
|
|
devWidth = std::min(std::max(0, devWidth), 0x7fff);
|
|
width = devWidth << 16;
|
|
mGlyphWidths->Put(aGID, width);
|
|
return width;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
void
|
|
gfxGDIFont::AddSizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf,
|
|
FontCacheSizes* aSizes) const
|
|
{
|
|
gfxFont::AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
|
|
aSizes->mFontInstances += aMallocSizeOf(mMetrics);
|
|
if (mGlyphWidths) {
|
|
aSizes->mFontInstances +=
|
|
mGlyphWidths->ShallowSizeOfIncludingThis(aMallocSizeOf);
|
|
}
|
|
}
|
|
|
|
void
|
|
gfxGDIFont::AddSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf,
|
|
FontCacheSizes* aSizes) const
|
|
{
|
|
aSizes->mFontInstances += aMallocSizeOf(this);
|
|
AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
|
|
}
|