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fune/gfx/2d/ScaledFontDWrite.cpp
Emilio Cobos Álvarez c25b3b246f Bug 1862061 - Remove -moz-font-smoothing-background-color. r=gfx-reviewers,desktop-theme-reviewers,devtools-reviewers,dao,gw 
See comments in the bug for reasoning. macOS hasn't used subpixel AA for
quite a while.

Emulating this macOS AA on vibrant backgrounds was the only point of
this feature.

This allows to simplify the WebRender code quite a bit, too.

Differential Revision: https://phabricator.services.mozilla.com/D192311
2023-11-01 09:14:29 +00:00

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "ScaledFontDWrite.h"
#include "gfxDWriteCommon.h"
#include "UnscaledFontDWrite.h"
#include "PathD2D.h"
#include "gfxFont.h"
#include "Logging.h"
#include "mozilla/FontPropertyTypes.h"
#include "mozilla/webrender/WebRenderTypes.h"
#include "HelpersD2D.h"
#include "StackArray.h"
#include "dwrite_3.h"
#include "PathSkia.h"
#include "skia/include/core/SkPaint.h"
#include "skia/include/core/SkPath.h"
#include "skia/include/ports/SkTypeface_win.h"
#include <vector>
#include "cairo-win32.h"
#include "HelpersWinFonts.h"
namespace mozilla {
namespace gfx {
#define GASP_TAG 0x70736167
#define GASP_DOGRAY 0x2
static inline unsigned short readShort(const char* aBuf) {
return (*aBuf << 8) | *(aBuf + 1);
}
static bool DoGrayscale(IDWriteFontFace* aDWFace, Float ppem) {
void* tableContext;
char* tableData;
UINT32 tableSize;
BOOL exists;
aDWFace->TryGetFontTable(GASP_TAG, (const void**)&tableData, &tableSize,
&tableContext, &exists);
if (exists) {
if (tableSize < 4) {
aDWFace->ReleaseFontTable(tableContext);
return true;
}
struct gaspRange {
unsigned short maxPPEM; // Stored big-endian
unsigned short behavior; // Stored big-endian
};
unsigned short numRanges = readShort(tableData + 2);
if (tableSize < (UINT)4 + numRanges * 4) {
aDWFace->ReleaseFontTable(tableContext);
return true;
}
gaspRange* ranges = (gaspRange*)(tableData + 4);
for (int i = 0; i < numRanges; i++) {
if (readShort((char*)&ranges[i].maxPPEM) >= ppem) {
if (!(readShort((char*)&ranges[i].behavior) & GASP_DOGRAY)) {
aDWFace->ReleaseFontTable(tableContext);
return false;
}
break;
}
}
aDWFace->ReleaseFontTable(tableContext);
}
return true;
}
ScaledFontDWrite::ScaledFontDWrite(IDWriteFontFace* aFontFace,
const RefPtr<UnscaledFont>& aUnscaledFont,
Float aSize, bool aUseEmbeddedBitmap,
bool aUseMultistrikeBold, bool aGDIForced,
const gfxFontStyle* aStyle)
: ScaledFontBase(aUnscaledFont, aSize),
mFontFace(aFontFace),
mUseEmbeddedBitmap(aUseEmbeddedBitmap),
mUseMultistrikeBold(aUseMultistrikeBold),
mGDIForced(aGDIForced) {
if (aStyle) {
mStyle = SkFontStyle(aStyle->weight.ToIntRounded(),
DWriteFontStretchFromStretch(aStyle->stretch),
// FIXME(jwatt): also use kOblique_Slant
aStyle->style == FontSlantStyle::NORMAL
? SkFontStyle::kUpright_Slant
: SkFontStyle::kItalic_Slant);
}
}
already_AddRefed<Path> ScaledFontDWrite::GetPathForGlyphs(
const GlyphBuffer& aBuffer, const DrawTarget* aTarget) {
RefPtr<PathBuilder> pathBuilder = aTarget->CreatePathBuilder();
if (pathBuilder->GetBackendType() != BackendType::DIRECT2D &&
pathBuilder->GetBackendType() != BackendType::DIRECT2D1_1) {
return ScaledFontBase::GetPathForGlyphs(aBuffer, aTarget);
}
PathBuilderD2D* pathBuilderD2D =
static_cast<PathBuilderD2D*>(pathBuilder.get());
CopyGlyphsToSink(aBuffer, pathBuilderD2D->GetSink());
return pathBuilder->Finish();
}
SkTypeface* ScaledFontDWrite::CreateSkTypeface() {
RefPtr<IDWriteFactory> factory = Factory::GetDWriteFactory();
if (!factory) {
return nullptr;
}
auto& settings = DWriteSettings();
Float gamma = settings.Gamma();
// Skia doesn't support a gamma value outside of 0-4, so default to 2.2
if (gamma < 0.0f || gamma > 4.0f) {
gamma = 2.2f;
}
Float contrast = settings.EnhancedContrast();
// Skia doesn't support a contrast value outside of 0-1, so default to 1.0
if (contrast < 0.0f || contrast > 1.0f) {
contrast = 1.0f;
}
Float clearTypeLevel = settings.ClearTypeLevel();
if (clearTypeLevel < 0.0f || clearTypeLevel > 1.0f) {
clearTypeLevel = 1.0f;
}
return SkCreateTypefaceFromDWriteFont(factory, mFontFace, mStyle,
(int)settings.RenderingMode(), gamma,
contrast, clearTypeLevel);
}
void ScaledFontDWrite::SetupSkFontDrawOptions(SkFont& aFont) {
if (ForceGDIMode()) {
aFont.setEmbeddedBitmaps(true);
aFont.setSubpixel(false);
} else {
aFont.setEmbeddedBitmaps(UseEmbeddedBitmaps());
aFont.setSubpixel(true);
}
}
bool ScaledFontDWrite::MayUseBitmaps() {
return ForceGDIMode() || UseEmbeddedBitmaps();
}
void ScaledFontDWrite::CopyGlyphsToBuilder(const GlyphBuffer& aBuffer,
PathBuilder* aBuilder,
const Matrix* aTransformHint) {
BackendType backendType = aBuilder->GetBackendType();
if (backendType != BackendType::DIRECT2D &&
backendType != BackendType::DIRECT2D1_1) {
ScaledFontBase::CopyGlyphsToBuilder(aBuffer, aBuilder, aTransformHint);
return;
}
PathBuilderD2D* pathBuilderD2D = static_cast<PathBuilderD2D*>(aBuilder);
if (pathBuilderD2D->IsFigureActive()) {
gfxCriticalNote
<< "Attempting to copy glyphs to PathBuilderD2D with active figure.";
}
CopyGlyphsToSink(aBuffer, pathBuilderD2D->GetSink());
}
void ScaledFontDWrite::CopyGlyphsToSink(const GlyphBuffer& aBuffer,
ID2D1SimplifiedGeometrySink* aSink) {
std::vector<UINT16> indices;
std::vector<FLOAT> advances;
std::vector<DWRITE_GLYPH_OFFSET> offsets;
indices.resize(aBuffer.mNumGlyphs);
advances.resize(aBuffer.mNumGlyphs);
offsets.resize(aBuffer.mNumGlyphs);
memset(&advances.front(), 0, sizeof(FLOAT) * aBuffer.mNumGlyphs);
for (unsigned int i = 0; i < aBuffer.mNumGlyphs; i++) {
indices[i] = aBuffer.mGlyphs[i].mIndex;
offsets[i].advanceOffset = aBuffer.mGlyphs[i].mPosition.x;
offsets[i].ascenderOffset = -aBuffer.mGlyphs[i].mPosition.y;
}
HRESULT hr = mFontFace->GetGlyphRunOutline(
mSize, &indices.front(), &advances.front(), &offsets.front(),
aBuffer.mNumGlyphs, FALSE, FALSE, aSink);
if (FAILED(hr)) {
gfxCriticalNote << "Failed to copy glyphs to geometry sink. Code: "
<< hexa(hr);
}
}
bool UnscaledFontDWrite::GetFontFileData(FontFileDataOutput aDataCallback,
void* aBaton) {
UINT32 fileCount = 0;
HRESULT hr = mFontFace->GetFiles(&fileCount, nullptr);
if (FAILED(hr) || fileCount > 1) {
MOZ_ASSERT(false);
return false;
}
if (!aDataCallback) {
return true;
}
RefPtr<IDWriteFontFile> file;
hr = mFontFace->GetFiles(&fileCount, getter_AddRefs(file));
if (FAILED(hr)) {
return false;
}
const void* referenceKey;
UINT32 refKeySize;
// XXX - This can currently crash for webfonts, as when we get the reference
// key out of the file, that can be an invalid reference key for the loader
// we use it with. The fix to this is not obvious but it will probably
// have to happen inside thebes.
hr = file->GetReferenceKey(&referenceKey, &refKeySize);
if (FAILED(hr)) {
return false;
}
RefPtr<IDWriteFontFileLoader> loader;
hr = file->GetLoader(getter_AddRefs(loader));
if (FAILED(hr)) {
return false;
}
RefPtr<IDWriteFontFileStream> stream;
hr = loader->CreateStreamFromKey(referenceKey, refKeySize,
getter_AddRefs(stream));
if (FAILED(hr)) {
return false;
}
UINT64 fileSize64;
hr = stream->GetFileSize(&fileSize64);
if (FAILED(hr) || fileSize64 > UINT32_MAX) {
MOZ_ASSERT(false);
return false;
}
// Try to catch any device memory exceptions that may occur while attempting
// to read the file fragment.
void* context = nullptr;
hr = E_FAIL;
MOZ_SEH_TRY {
uint32_t fileSize = static_cast<uint32_t>(fileSize64);
const void* fragmentStart = nullptr;
hr = stream->ReadFileFragment(&fragmentStart, 0, fileSize, &context);
if (SUCCEEDED(hr)) {
aDataCallback((uint8_t*)fragmentStart, fileSize, mFontFace->GetIndex(),
aBaton);
}
}
MOZ_SEH_EXCEPT(EXCEPTION_EXECUTE_HANDLER) {
gfxCriticalNote << "Exception occurred reading DWrite font file data";
}
if (FAILED(hr)) {
return false;
}
stream->ReleaseFileFragment(context);
return true;
}
static bool GetFontFileName(RefPtr<IDWriteFontFace> aFontFace,
std::vector<WCHAR>& aFileName) {
UINT32 numFiles;
HRESULT hr = aFontFace->GetFiles(&numFiles, nullptr);
if (FAILED(hr)) {
gfxDebug() << "Failed getting file count for WR font";
return false;
} else if (numFiles != 1) {
gfxDebug() << "Invalid file count " << numFiles << " for WR font";
return false;
}
RefPtr<IDWriteFontFile> file;
hr = aFontFace->GetFiles(&numFiles, getter_AddRefs(file));
if (FAILED(hr)) {
gfxDebug() << "Failed getting file for WR font";
return false;
}
const void* key;
UINT32 keySize;
hr = file->GetReferenceKey(&key, &keySize);
if (FAILED(hr)) {
gfxDebug() << "Failed getting file ref key for WR font";
return false;
}
RefPtr<IDWriteFontFileLoader> loader;
hr = file->GetLoader(getter_AddRefs(loader));
if (FAILED(hr)) {
gfxDebug() << "Failed getting file loader for WR font";
return false;
}
RefPtr<IDWriteLocalFontFileLoader> localLoader;
loader->QueryInterface(__uuidof(IDWriteLocalFontFileLoader),
(void**)getter_AddRefs(localLoader));
if (!localLoader) {
gfxDebug() << "Failed querying loader interface for WR font";
return false;
}
UINT32 pathLen;
hr = localLoader->GetFilePathLengthFromKey(key, keySize, &pathLen);
if (FAILED(hr)) {
gfxDebug() << "Failed getting path length for WR font";
return false;
}
aFileName.resize(pathLen + 1);
hr = localLoader->GetFilePathFromKey(key, keySize, aFileName.data(),
pathLen + 1);
if (FAILED(hr) || aFileName.back() != 0) {
gfxDebug() << "Failed getting path for WR font";
return false;
}
DWORD attribs = GetFileAttributesW(aFileName.data());
if (attribs == INVALID_FILE_ATTRIBUTES) {
gfxDebug() << "Invalid file \"" << aFileName.data() << "\" for WR font";
return false;
}
// We leave the null terminator at the end of the returned file name.
return true;
}
bool UnscaledFontDWrite::GetFontDescriptor(FontDescriptorOutput aCb,
void* aBaton) {
if (!mFont) {
return false;
}
std::vector<WCHAR> fileName;
if (!GetFontFileName(mFontFace, fileName)) {
return false;
}
uint32_t index = mFontFace->GetIndex();
aCb(reinterpret_cast<const uint8_t*>(fileName.data()),
fileName.size() * sizeof(WCHAR), index, aBaton);
return true;
}
ScaledFontDWrite::InstanceData::InstanceData(
const wr::FontInstanceOptions* aOptions,
const wr::FontInstancePlatformOptions* aPlatformOptions) {
if (aOptions) {
if (aOptions->flags & wr::FontInstanceFlags::EMBEDDED_BITMAPS) {
mUseEmbeddedBitmap = true;
}
if (aOptions->flags & wr::FontInstanceFlags::SYNTHETIC_BOLD) {
mUseBoldSimulation = true;
}
if (aOptions->flags & wr::FontInstanceFlags::MULTISTRIKE_BOLD) {
mUseMultistrikeBold = true;
}
if (aOptions->flags & wr::FontInstanceFlags::FORCE_GDI) {
mGDIForced = true;
}
}
}
bool ScaledFontDWrite::HasVariationSettings() {
RefPtr<IDWriteFontFace5> ff5;
mFontFace->QueryInterface(__uuidof(IDWriteFontFace5),
(void**)getter_AddRefs(ff5));
if (!ff5 || !ff5->HasVariations()) {
return false;
}
uint32_t count = ff5->GetFontAxisValueCount();
if (!count) {
return false;
}
RefPtr<IDWriteFontResource> res;
if (FAILED(ff5->GetFontResource(getter_AddRefs(res)))) {
return false;
}
std::vector<DWRITE_FONT_AXIS_VALUE> defaults(count);
if (FAILED(res->GetDefaultFontAxisValues(defaults.data(), count))) {
return false;
}
std::vector<DWRITE_FONT_AXIS_VALUE> values(count);
if (FAILED(ff5->GetFontAxisValues(values.data(), count))) {
return false;
}
for (uint32_t i = 0; i < count; i++) {
DWRITE_FONT_AXIS_ATTRIBUTES attr = res->GetFontAxisAttributes(i);
if (attr & DWRITE_FONT_AXIS_ATTRIBUTES_VARIABLE) {
if (values[i].value != defaults[i].value) {
return true;
}
}
}
return false;
}
// Helper for ScaledFontDWrite::GetFontInstanceData: if the font has variation
// axes, get their current values into the aOutput vector.
static void GetVariationsFromFontFace(IDWriteFontFace* aFace,
std::vector<FontVariation>* aOutput) {
RefPtr<IDWriteFontFace5> ff5;
aFace->QueryInterface(__uuidof(IDWriteFontFace5),
(void**)getter_AddRefs(ff5));
if (!ff5 || !ff5->HasVariations()) {
return;
}
uint32_t count = ff5->GetFontAxisValueCount();
if (!count) {
return;
}
RefPtr<IDWriteFontResource> res;
if (FAILED(ff5->GetFontResource(getter_AddRefs(res)))) {
return;
}
std::vector<DWRITE_FONT_AXIS_VALUE> values(count);
if (FAILED(ff5->GetFontAxisValues(values.data(), count))) {
return;
}
aOutput->reserve(count);
for (uint32_t i = 0; i < count; i++) {
DWRITE_FONT_AXIS_ATTRIBUTES attr = res->GetFontAxisAttributes(i);
if (attr & DWRITE_FONT_AXIS_ATTRIBUTES_VARIABLE) {
float v = values[i].value;
uint32_t t = TRUETYPE_TAG(
uint8_t(values[i].axisTag), uint8_t(values[i].axisTag >> 8),
uint8_t(values[i].axisTag >> 16), uint8_t(values[i].axisTag >> 24));
aOutput->push_back(FontVariation{uint32_t(t), float(v)});
}
}
}
bool ScaledFontDWrite::GetFontInstanceData(FontInstanceDataOutput aCb,
void* aBaton) {
InstanceData instance(this);
// If the font has variations, get the list of axis values.
std::vector<FontVariation> variations;
GetVariationsFromFontFace(mFontFace, &variations);
aCb(reinterpret_cast<uint8_t*>(&instance), sizeof(instance),
variations.data(), variations.size(), aBaton);
return true;
}
bool ScaledFontDWrite::GetWRFontInstanceOptions(
Maybe<wr::FontInstanceOptions>* aOutOptions,
Maybe<wr::FontInstancePlatformOptions>* aOutPlatformOptions,
std::vector<FontVariation>* aOutVariations) {
wr::FontInstanceOptions options;
options.render_mode = wr::ToFontRenderMode(GetDefaultAAMode());
options.flags = wr::FontInstanceFlags{0};
if (HasBoldSimulation()) {
options.flags |= wr::FontInstanceFlags::SYNTHETIC_BOLD;
}
if (UseMultistrikeBold()) {
options.flags |= wr::FontInstanceFlags::MULTISTRIKE_BOLD;
}
if (UseEmbeddedBitmaps()) {
options.flags |= wr::FontInstanceFlags::EMBEDDED_BITMAPS;
}
if (ForceGDIMode()) {
options.flags |= wr::FontInstanceFlags::FORCE_GDI;
} else {
options.flags |= wr::FontInstanceFlags::SUBPIXEL_POSITION;
}
auto& settings = DWriteSettings();
switch (settings.RenderingMode()) {
case DWRITE_RENDERING_MODE_CLEARTYPE_NATURAL_SYMMETRIC:
options.flags |= wr::FontInstanceFlags::FORCE_SYMMETRIC;
break;
case DWRITE_RENDERING_MODE_CLEARTYPE_NATURAL:
options.flags |= wr::FontInstanceFlags::NO_SYMMETRIC;
break;
default:
break;
}
if (Factory::GetBGRSubpixelOrder()) {
options.flags |= wr::FontInstanceFlags::SUBPIXEL_BGR;
}
options.synthetic_italics =
wr::DegreesToSyntheticItalics(GetSyntheticObliqueAngle());
wr::FontInstancePlatformOptions platformOptions;
platformOptions.gamma = uint16_t(std::round(settings.Gamma() * 100.0f));
platformOptions.contrast =
uint8_t(std::round(std::min(settings.EnhancedContrast(), 1.0f) * 100.0f));
platformOptions.cleartype_level =
uint8_t(std::round(std::min(settings.ClearTypeLevel(), 1.0f) * 100.0f));
*aOutOptions = Some(options);
*aOutPlatformOptions = Some(platformOptions);
GetVariationsFromFontFace(mFontFace, aOutVariations);
return true;
}
DWriteSettings& ScaledFontDWrite::DWriteSettings() const {
return DWriteSettings::Get(mGDIForced);
}
// Helper for UnscaledFontDWrite::CreateScaledFont: create a clone of the
// given IDWriteFontFace, with specified variation-axis values applied.
// Returns nullptr in case of failure.
static already_AddRefed<IDWriteFontFace5> CreateFaceWithVariations(
IDWriteFontFace* aFace, DWRITE_FONT_SIMULATIONS aSimulations,
const FontVariation* aVariations = nullptr, uint32_t aNumVariations = 0) {
auto makeDWriteAxisTag = [](uint32_t aTag) {
return DWRITE_MAKE_FONT_AXIS_TAG((aTag >> 24) & 0xff, (aTag >> 16) & 0xff,
(aTag >> 8) & 0xff, aTag & 0xff);
};
MOZ_SEH_TRY {
RefPtr<IDWriteFontFace5> ff5;
aFace->QueryInterface(__uuidof(IDWriteFontFace5),
(void**)getter_AddRefs(ff5));
if (!ff5) {
return nullptr;
}
RefPtr<IDWriteFontResource> res;
if (FAILED(ff5->GetFontResource(getter_AddRefs(res)))) {
return nullptr;
}
std::vector<DWRITE_FONT_AXIS_VALUE> fontAxisValues;
if (aNumVariations) {
fontAxisValues.reserve(aNumVariations);
for (uint32_t i = 0; i < aNumVariations; i++) {
DWRITE_FONT_AXIS_VALUE axisValue = {
makeDWriteAxisTag(aVariations[i].mTag), aVariations[i].mValue};
fontAxisValues.push_back(axisValue);
}
} else {
uint32_t count = ff5->GetFontAxisValueCount();
if (count) {
fontAxisValues.resize(count);
if (FAILED(ff5->GetFontAxisValues(fontAxisValues.data(), count))) {
fontAxisValues.clear();
}
}
}
RefPtr<IDWriteFontFace5> newFace;
if (FAILED(res->CreateFontFace(aSimulations, fontAxisValues.data(),
fontAxisValues.size(),
getter_AddRefs(newFace)))) {
return nullptr;
}
return newFace.forget();
}
MOZ_SEH_EXCEPT(EXCEPTION_EXECUTE_HANDLER) {
gfxCriticalNote << "Exception occurred initializing variation face";
return nullptr;
}
}
bool UnscaledFontDWrite::InitBold() {
if (mFontFaceBold) {
return true;
}
DWRITE_FONT_SIMULATIONS sims = mFontFace->GetSimulations();
if (sims & DWRITE_FONT_SIMULATIONS_BOLD) {
mFontFaceBold = mFontFace;
return true;
}
sims |= DWRITE_FONT_SIMULATIONS_BOLD;
RefPtr<IDWriteFontFace5> ff5 = CreateFaceWithVariations(mFontFace, sims);
if (ff5) {
mFontFaceBold = ff5;
} else {
MOZ_SEH_TRY {
UINT32 numFiles = 0;
if (FAILED(mFontFace->GetFiles(&numFiles, nullptr))) {
return false;
}
StackArray<IDWriteFontFile*, 1> files(numFiles);
if (FAILED(mFontFace->GetFiles(&numFiles, files.data()))) {
return false;
}
HRESULT hr = Factory::GetDWriteFactory()->CreateFontFace(
mFontFace->GetType(), numFiles, files.data(), mFontFace->GetIndex(),
sims, getter_AddRefs(mFontFaceBold));
for (UINT32 i = 0; i < numFiles; ++i) {
files[i]->Release();
}
if (FAILED(hr) || !mFontFaceBold) {
return false;
}
}
MOZ_SEH_EXCEPT(EXCEPTION_EXECUTE_HANDLER) {
gfxCriticalNote << "Exception occurred initializing bold face";
return false;
}
}
return true;
}
already_AddRefed<ScaledFont> UnscaledFontDWrite::CreateScaledFont(
Float aGlyphSize, const uint8_t* aInstanceData,
uint32_t aInstanceDataLength, const FontVariation* aVariations,
uint32_t aNumVariations) {
if (aInstanceDataLength < sizeof(ScaledFontDWrite::InstanceData)) {
gfxWarning() << "DWrite scaled font instance data is truncated.";
return nullptr;
}
const ScaledFontDWrite::InstanceData& instanceData =
*reinterpret_cast<const ScaledFontDWrite::InstanceData*>(aInstanceData);
IDWriteFontFace* face = mFontFace;
if (instanceData.mUseBoldSimulation) {
if (!InitBold()) {
gfxWarning() << "Failed creating bold IDWriteFontFace.";
return nullptr;
}
face = mFontFaceBold;
}
DWRITE_FONT_SIMULATIONS sims = face->GetSimulations();
// If variations are required, we create a separate IDWriteFontFace5 with
// the requested settings applied.
RefPtr<IDWriteFontFace5> ff5;
if (aNumVariations) {
ff5 =
CreateFaceWithVariations(mFontFace, sims, aVariations, aNumVariations);
if (ff5) {
face = ff5;
} else {
gfxWarning() << "Failed to create IDWriteFontFace5 with variations.";
}
}
return MakeAndAddRef<ScaledFontDWrite>(
face, this, aGlyphSize, instanceData.mUseEmbeddedBitmap,
instanceData.mUseMultistrikeBold, instanceData.mGDIForced, nullptr);
}
already_AddRefed<ScaledFont> UnscaledFontDWrite::CreateScaledFontFromWRFont(
Float aGlyphSize, const wr::FontInstanceOptions* aOptions,
const wr::FontInstancePlatformOptions* aPlatformOptions,
const FontVariation* aVariations, uint32_t aNumVariations) {
ScaledFontDWrite::InstanceData instanceData(aOptions, aPlatformOptions);
return CreateScaledFont(aGlyphSize, reinterpret_cast<uint8_t*>(&instanceData),
sizeof(instanceData), aVariations, aNumVariations);
}
AntialiasMode ScaledFontDWrite::GetDefaultAAMode() {
AntialiasMode defaultMode = GetSystemDefaultAAMode();
switch (defaultMode) {
case AntialiasMode::SUBPIXEL:
case AntialiasMode::DEFAULT:
if (DWriteSettings().ClearTypeLevel() == 0.0f) {
defaultMode = AntialiasMode::GRAY;
}
break;
case AntialiasMode::GRAY:
if (!DoGrayscale(mFontFace, mSize)) {
defaultMode = AntialiasMode::NONE;
}
break;
case AntialiasMode::NONE:
break;
}
return defaultMode;
}
cairo_font_face_t* ScaledFontDWrite::CreateCairoFontFace(
cairo_font_options_t* aFontOptions) {
if (!mFontFace) {
return nullptr;
}
return cairo_dwrite_font_face_create_for_dwrite_fontface(nullptr, mFontFace);
}
void ScaledFontDWrite::PrepareCairoScaledFont(cairo_scaled_font_t* aFont) {
if (mGDIForced) {
cairo_dwrite_scaled_font_set_force_GDI_classic(aFont, true);
}
}
already_AddRefed<UnscaledFont> UnscaledFontDWrite::CreateFromFontDescriptor(
const uint8_t* aData, uint32_t aDataLength, uint32_t aIndex) {
// Note that despite the type of aData here, it actually points to a 16-bit
// Windows font file path (hence the cast to WCHAR* below).
if (aDataLength == 0) {
gfxWarning() << "DWrite font descriptor is truncated.";
return nullptr;
}
RefPtr<IDWriteFactory> factory = Factory::GetDWriteFactory();
if (!factory) {
return nullptr;
}
MOZ_SEH_TRY {
RefPtr<IDWriteFontFile> fontFile;
HRESULT hr = factory->CreateFontFileReference((const WCHAR*)aData, nullptr,
getter_AddRefs(fontFile));
if (FAILED(hr)) {
return nullptr;
}
BOOL isSupported;
DWRITE_FONT_FILE_TYPE fileType;
DWRITE_FONT_FACE_TYPE faceType;
UINT32 numFaces;
hr = fontFile->Analyze(&isSupported, &fileType, &faceType, &numFaces);
if (FAILED(hr) || !isSupported || aIndex >= numFaces) {
return nullptr;
}
IDWriteFontFile* fontFiles[1] = {fontFile.get()};
RefPtr<IDWriteFontFace> fontFace;
hr = factory->CreateFontFace(faceType, 1, fontFiles, aIndex,
DWRITE_FONT_SIMULATIONS_NONE,
getter_AddRefs(fontFace));
if (FAILED(hr)) {
return nullptr;
}
RefPtr unscaledFont = new UnscaledFontDWrite(fontFace, nullptr);
return unscaledFont.forget();
}
MOZ_SEH_EXCEPT(EXCEPTION_EXECUTE_HANDLER) {
gfxCriticalNote << "Exception occurred creating unscaledFont for "
<< NS_ConvertUTF16toUTF8((const char16_t*)aData).get();
return nullptr;
}
}
} // namespace gfx
} // namespace mozilla
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