296 lines
8.8 KiB
C++
296 lines
8.8 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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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 "DrawTargetD2D1.h"
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#include "ScaledFontDWrite.h"
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#include "PathD2D.h"
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#include "gfxFont.h"
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using namespace std;
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#ifdef USE_SKIA
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#include "PathSkia.h"
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#include "skia/include/core/SkPaint.h"
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#include "skia/include/core/SkPath.h"
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#include "skia/include/ports/SkTypeface_win.h"
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#endif
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#include <vector>
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#ifdef USE_CAIRO_SCALED_FONT
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#include "cairo-win32.h"
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#endif
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#include "HelpersWinFonts.h"
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namespace mozilla {
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namespace gfx {
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#define GASP_TAG 0x70736167
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#define GASP_DOGRAY 0x2
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static inline unsigned short
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readShort(const char *aBuf)
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{
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return (*aBuf << 8) | *(aBuf + 1);
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}
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static bool
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DoGrayscale(IDWriteFontFace *aDWFace, Float ppem)
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{
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void *tableContext;
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char *tableData;
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UINT32 tableSize;
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BOOL exists;
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aDWFace->TryGetFontTable(GASP_TAG, (const void**)&tableData, &tableSize, &tableContext, &exists);
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if (exists) {
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if (tableSize < 4) {
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aDWFace->ReleaseFontTable(tableContext);
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return true;
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}
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struct gaspRange {
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unsigned short maxPPEM; // Stored big-endian
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unsigned short behavior; // Stored big-endian
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};
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unsigned short numRanges = readShort(tableData + 2);
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if (tableSize < (UINT)4 + numRanges * 4) {
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aDWFace->ReleaseFontTable(tableContext);
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return true;
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}
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gaspRange *ranges = (gaspRange *)(tableData + 4);
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for (int i = 0; i < numRanges; i++) {
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if (readShort((char*)&ranges[i].maxPPEM) > ppem) {
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if (!(readShort((char*)&ranges[i].behavior) & GASP_DOGRAY)) {
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aDWFace->ReleaseFontTable(tableContext);
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return false;
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}
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break;
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}
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}
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aDWFace->ReleaseFontTable(tableContext);
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}
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return true;
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}
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static inline DWRITE_FONT_STRETCH
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DWriteFontStretchFromStretch(int16_t aStretch)
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{
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switch (aStretch) {
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case NS_FONT_STRETCH_ULTRA_CONDENSED:
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return DWRITE_FONT_STRETCH_ULTRA_CONDENSED;
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case NS_FONT_STRETCH_EXTRA_CONDENSED:
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return DWRITE_FONT_STRETCH_EXTRA_CONDENSED;
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case NS_FONT_STRETCH_CONDENSED:
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return DWRITE_FONT_STRETCH_CONDENSED;
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case NS_FONT_STRETCH_SEMI_CONDENSED:
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return DWRITE_FONT_STRETCH_SEMI_CONDENSED;
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case NS_FONT_STRETCH_NORMAL:
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return DWRITE_FONT_STRETCH_NORMAL;
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case NS_FONT_STRETCH_SEMI_EXPANDED:
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return DWRITE_FONT_STRETCH_SEMI_EXPANDED;
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case NS_FONT_STRETCH_EXPANDED:
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return DWRITE_FONT_STRETCH_EXPANDED;
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case NS_FONT_STRETCH_EXTRA_EXPANDED:
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return DWRITE_FONT_STRETCH_EXTRA_EXPANDED;
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case NS_FONT_STRETCH_ULTRA_EXPANDED:
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return DWRITE_FONT_STRETCH_ULTRA_EXPANDED;
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default:
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return DWRITE_FONT_STRETCH_UNDEFINED;
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}
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}
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ScaledFontDWrite::ScaledFontDWrite(IDWriteFontFace *aFontFace, Float aSize,
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bool aUseEmbeddedBitmap, bool aForceGDIMode,
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const gfxFontStyle* aStyle)
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: ScaledFontBase(aSize)
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, mFontFace(aFontFace)
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, mUseEmbeddedBitmap(aUseEmbeddedBitmap)
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, mForceGDIMode(aForceGDIMode)
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{
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#ifdef USE_SKIA
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mStyle = SkFontStyle(aStyle->weight,
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DWriteFontStretchFromStretch(aStyle->stretch),
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aStyle->style == NS_FONT_STYLE_NORMAL ?
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SkFontStyle::kUpright_Slant : SkFontStyle::kItalic_Slant);
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#endif
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}
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already_AddRefed<Path>
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ScaledFontDWrite::GetPathForGlyphs(const GlyphBuffer &aBuffer, const DrawTarget *aTarget)
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{
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if (aTarget->GetBackendType() != BackendType::DIRECT2D && aTarget->GetBackendType() != BackendType::DIRECT2D1_1) {
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return ScaledFontBase::GetPathForGlyphs(aBuffer, aTarget);
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}
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RefPtr<PathBuilder> pathBuilder = aTarget->CreatePathBuilder();
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PathBuilderD2D *pathBuilderD2D =
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static_cast<PathBuilderD2D*>(pathBuilder.get());
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CopyGlyphsToSink(aBuffer, pathBuilderD2D->GetSink());
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return pathBuilder->Finish();
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}
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#ifdef USE_SKIA
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SkTypeface*
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ScaledFontDWrite::GetSkTypeface()
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{
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if (!mTypeface) {
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IDWriteFactory *factory = DrawTargetD2D1::GetDWriteFactory();
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if (!factory) {
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return nullptr;
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}
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mTypeface = SkCreateTypefaceFromDWriteFont(factory, mFontFace, mStyle, mForceGDIMode);
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}
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return mTypeface;
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}
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#endif
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void
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ScaledFontDWrite::CopyGlyphsToBuilder(const GlyphBuffer &aBuffer, PathBuilder *aBuilder, const Matrix *aTransformHint)
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{
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BackendType backendType = aBuilder->GetBackendType();
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if (backendType != BackendType::DIRECT2D && backendType != BackendType::DIRECT2D1_1) {
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ScaledFontBase::CopyGlyphsToBuilder(aBuffer, aBuilder, aTransformHint);
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return;
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}
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PathBuilderD2D *pathBuilderD2D =
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static_cast<PathBuilderD2D*>(aBuilder);
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if (pathBuilderD2D->IsFigureActive()) {
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gfxCriticalNote << "Attempting to copy glyphs to PathBuilderD2D with active figure.";
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}
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CopyGlyphsToSink(aBuffer, pathBuilderD2D->GetSink());
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}
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void
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ScaledFontDWrite::GetGlyphDesignMetrics(const uint16_t* aGlyphs, uint32_t aNumGlyphs, GlyphMetrics* aGlyphMetrics)
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{
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DWRITE_FONT_METRICS fontMetrics;
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mFontFace->GetMetrics(&fontMetrics);
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vector<DWRITE_GLYPH_METRICS> metrics(aNumGlyphs);
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mFontFace->GetDesignGlyphMetrics(aGlyphs, aNumGlyphs, &metrics.front());
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Float designUnitCorrection = 1.f / fontMetrics.designUnitsPerEm;
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for (uint32_t i = 0; i < aNumGlyphs; i++) {
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aGlyphMetrics[i].mXBearing = metrics[i].leftSideBearing * designUnitCorrection * mSize;
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aGlyphMetrics[i].mXAdvance = metrics[i].advanceWidth * designUnitCorrection * mSize;
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aGlyphMetrics[i].mYBearing = metrics[i].topSideBearing * designUnitCorrection * mSize;
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aGlyphMetrics[i].mYAdvance = metrics[i].advanceHeight * designUnitCorrection * mSize;
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aGlyphMetrics[i].mWidth = (metrics[i].advanceHeight - metrics[i].topSideBearing - metrics[i].bottomSideBearing) *
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designUnitCorrection * mSize;
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aGlyphMetrics[i].mHeight = (metrics[i].topSideBearing - metrics[i].verticalOriginY) * designUnitCorrection * mSize;
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}
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}
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void
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ScaledFontDWrite::CopyGlyphsToSink(const GlyphBuffer &aBuffer, ID2D1GeometrySink *aSink)
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{
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std::vector<UINT16> indices;
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std::vector<FLOAT> advances;
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std::vector<DWRITE_GLYPH_OFFSET> offsets;
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indices.resize(aBuffer.mNumGlyphs);
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advances.resize(aBuffer.mNumGlyphs);
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offsets.resize(aBuffer.mNumGlyphs);
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memset(&advances.front(), 0, sizeof(FLOAT) * aBuffer.mNumGlyphs);
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for (unsigned int i = 0; i < aBuffer.mNumGlyphs; i++) {
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indices[i] = aBuffer.mGlyphs[i].mIndex;
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offsets[i].advanceOffset = aBuffer.mGlyphs[i].mPosition.x;
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offsets[i].ascenderOffset = -aBuffer.mGlyphs[i].mPosition.y;
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}
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HRESULT hr =
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mFontFace->GetGlyphRunOutline(mSize, &indices.front(), &advances.front(),
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&offsets.front(), aBuffer.mNumGlyphs,
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FALSE, FALSE, aSink);
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if (FAILED(hr)) {
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gfxCriticalNote << "Failed to copy glyphs to geometry sink. Code: " << hexa(hr);
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}
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}
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bool
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ScaledFontDWrite::GetFontFileData(FontFileDataOutput aDataCallback, void *aBaton)
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{
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UINT32 fileCount = 0;
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mFontFace->GetFiles(&fileCount, nullptr);
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if (fileCount > 1) {
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MOZ_ASSERT(false);
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return false;
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}
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RefPtr<IDWriteFontFile> file;
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mFontFace->GetFiles(&fileCount, getter_AddRefs(file));
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const void *referenceKey;
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UINT32 refKeySize;
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// XXX - This can currently crash for webfonts, as when we get the reference
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// key out of the file, that can be an invalid reference key for the loader
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// we use it with. The fix to this is not obvious but it will probably
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// have to happen inside thebes.
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file->GetReferenceKey(&referenceKey, &refKeySize);
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RefPtr<IDWriteFontFileLoader> loader;
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file->GetLoader(getter_AddRefs(loader));
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RefPtr<IDWriteFontFileStream> stream;
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loader->CreateStreamFromKey(referenceKey, refKeySize, getter_AddRefs(stream));
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UINT64 fileSize64;
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stream->GetFileSize(&fileSize64);
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if (fileSize64 > UINT32_MAX) {
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MOZ_ASSERT(false);
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return false;
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}
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uint32_t fileSize = static_cast<uint32_t>(fileSize64);
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const void *fragmentStart;
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void *context;
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stream->ReadFileFragment(&fragmentStart, 0, fileSize, &context);
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aDataCallback((uint8_t*)fragmentStart, fileSize, mFontFace->GetIndex(), mSize, aBaton);
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stream->ReleaseFileFragment(context);
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return true;
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}
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AntialiasMode
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ScaledFontDWrite::GetDefaultAAMode()
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{
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AntialiasMode defaultMode = GetSystemDefaultAAMode();
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if (defaultMode == AntialiasMode::GRAY) {
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if (!DoGrayscale(mFontFace, mSize)) {
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defaultMode = AntialiasMode::NONE;
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}
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}
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return defaultMode;
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}
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#ifdef USE_CAIRO_SCALED_FONT
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cairo_font_face_t*
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ScaledFontDWrite::GetCairoFontFace()
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{
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if (!mFontFace) {
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return nullptr;
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}
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return cairo_dwrite_font_face_create_for_dwrite_fontface(nullptr, mFontFace);
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}
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#endif
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}
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}
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