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fune/gfx/2d/ScaledFontDWrite.cpp

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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 "UnscaledFontDWrite.h"
#include "PathD2D.h"
#include "gfxFont.h"
#include "Logging.h"
#include "mozilla/FontPropertyTypes.h"
#include "mozilla/webrender/WebRenderTypes.h"
#include "dwrite_3.h"
// Currently, we build with WINVER=0x601 (Win7), which means newer
// declarations in dwrite_3.h will not be visible. Also, we don't
// yet have the Fall Creators Update SDK available on build machines,
// so even with updated WINVER, some of the interfaces we need would
// not be present.
// To work around this, until the build environment is updated,
// we #include an extra header that contains copies of the relevant
// classes/interfaces we need.
#if !defined(__MINGW32__) && WINVER < 0x0A00
#include "dw-extra.h"
#endif
using namespace std;
#ifdef USE_SKIA
#include "PathSkia.h"
#include "skia/include/core/SkPaint.h"
#include "skia/include/core/SkPath.h"
#include "skia/include/ports/SkTypeface_win.h"
#endif
#include <vector>
#ifdef USE_CAIRO_SCALED_FONT
#include "cairo-win32.h"
#endif
#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;
}
static inline DWRITE_FONT_STRETCH
DWriteFontStretchFromStretch(FontStretch aStretch)
{
if (aStretch == FontStretch::UltraCondensed()) {
return DWRITE_FONT_STRETCH_ULTRA_CONDENSED;
}
if (aStretch == FontStretch::ExtraCondensed()) {
return DWRITE_FONT_STRETCH_EXTRA_CONDENSED;
}
if (aStretch == FontStretch::Condensed()) {
return DWRITE_FONT_STRETCH_CONDENSED;
}
if (aStretch == FontStretch::SemiCondensed()) {
return DWRITE_FONT_STRETCH_SEMI_CONDENSED;
}
if (aStretch == FontStretch::Normal()) {
return DWRITE_FONT_STRETCH_NORMAL;
}
if (aStretch == FontStretch::SemiExpanded()) {
return DWRITE_FONT_STRETCH_SEMI_EXPANDED;
}
if (aStretch == FontStretch::Expanded()) {
return DWRITE_FONT_STRETCH_EXPANDED;
}
if (aStretch == FontStretch::ExtraExpanded()) {
return DWRITE_FONT_STRETCH_EXTRA_EXPANDED;
}
if (aStretch == FontStretch::UltraExpanded()) {
return DWRITE_FONT_STRETCH_ULTRA_EXPANDED;
}
return DWRITE_FONT_STRETCH_UNDEFINED;
}
ScaledFontDWrite::ScaledFontDWrite(IDWriteFontFace *aFontFace,
const RefPtr<UnscaledFont>& aUnscaledFont,
Float aSize,
bool aUseEmbeddedBitmap,
bool aForceGDIMode,
IDWriteRenderingParams* aParams,
Float aGamma,
Float aContrast,
const gfxFontStyle* aStyle)
: ScaledFontBase(aUnscaledFont, aSize)
, mFontFace(aFontFace)
, mUseEmbeddedBitmap(aUseEmbeddedBitmap)
, mForceGDIMode(aForceGDIMode)
, mParams(aParams)
, mGamma(aGamma)
, mContrast(aContrast)
{
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)
{
if (aTarget->GetBackendType() != BackendType::DIRECT2D && aTarget->GetBackendType() != BackendType::DIRECT2D1_1) {
return ScaledFontBase::GetPathForGlyphs(aBuffer, aTarget);
}
RefPtr<PathBuilder> pathBuilder = aTarget->CreatePathBuilder();
PathBuilderD2D *pathBuilderD2D =
static_cast<PathBuilderD2D*>(pathBuilder.get());
CopyGlyphsToSink(aBuffer, pathBuilderD2D->GetSink());
return pathBuilder->Finish();
}
#ifdef USE_SKIA
SkTypeface*
ScaledFontDWrite::CreateSkTypeface()
{
RefPtr<IDWriteFactory> factory = Factory::GetDWriteFactory();
if (!factory) {
return nullptr;
}
Float gamma = mGamma;
// 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 = mContrast;
// 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;
}
return SkCreateTypefaceFromDWriteFont(factory, mFontFace, mStyle, mForceGDIMode, gamma, contrast);
}
#endif
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::GetGlyphDesignMetrics(const uint16_t* aGlyphs,
uint32_t aNumGlyphs,
GlyphMetrics* aGlyphMetrics)
{
DWRITE_FONT_METRICS fontMetrics;
mFontFace->GetMetrics(&fontMetrics);
vector<DWRITE_GLYPH_METRICS> metrics(aNumGlyphs);
mFontFace->GetDesignGlyphMetrics(aGlyphs, aNumGlyphs, &metrics.front());
Float scaleFactor = mSize / fontMetrics.designUnitsPerEm;
for (uint32_t i = 0; i < aNumGlyphs; i++) {
aGlyphMetrics[i].mXBearing = metrics[i].leftSideBearing * scaleFactor;
aGlyphMetrics[i].mXAdvance = metrics[i].advanceWidth * scaleFactor;
aGlyphMetrics[i].mYBearing = (metrics[i].topSideBearing -
metrics[i].verticalOriginY) * scaleFactor;
aGlyphMetrics[i].mYAdvance = metrics[i].advanceHeight * scaleFactor;
aGlyphMetrics[i].mWidth = (metrics[i].advanceWidth -
metrics[i].leftSideBearing -
metrics[i].rightSideBearing) * scaleFactor;
aGlyphMetrics[i].mHeight = (metrics[i].advanceHeight -
metrics[i].topSideBearing -
metrics[i].bottomSideBearing) * scaleFactor;
}
}
void
ScaledFontDWrite::CopyGlyphsToSink(const GlyphBuffer &aBuffer, ID2D1GeometrySink *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;
mFontFace->GetFiles(&fileCount, nullptr);
if (fileCount > 1) {
MOZ_ASSERT(false);
return false;
}
if (!aDataCallback) {
return true;
}
RefPtr<IDWriteFontFile> file;
mFontFace->GetFiles(&fileCount, getter_AddRefs(file));
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.
file->GetReferenceKey(&referenceKey, &refKeySize);
RefPtr<IDWriteFontFileLoader> loader;
file->GetLoader(getter_AddRefs(loader));
RefPtr<IDWriteFontFileStream> stream;
loader->CreateStreamFromKey(referenceKey, refKeySize, getter_AddRefs(stream));
UINT64 fileSize64;
stream->GetFileSize(&fileSize64);
if (fileSize64 > UINT32_MAX) {
MOZ_ASSERT(false);
return false;
}
uint32_t fileSize = static_cast<uint32_t>(fileSize64);
const void *fragmentStart;
void *context;
stream->ReadFileFragment(&fragmentStart, 0, fileSize, &context);
aDataCallback((uint8_t*)fragmentStart, fileSize, mFontFace->GetIndex(), aBaton);
stream->ReleaseFileFragment(context);
return true;
}
static bool
GetDWriteName(RefPtr<IDWriteLocalizedStrings> aNames, std::vector<WCHAR>& aOutName)
{
BOOL exists = false;
UINT32 index = 0;
HRESULT hr = aNames->FindLocaleName(L"en-us", &index, &exists);
if (FAILED(hr)) {
return false;
}
if (!exists) {
// No english found, use whatever is first in the list.
index = 0;
}
UINT32 length;
hr = aNames->GetStringLength(index, &length);
if (FAILED(hr)) {
return false;
}
aOutName.resize(length + 1);
hr = aNames->GetString(index, aOutName.data(), length + 1);
return SUCCEEDED(hr);
}
static bool
GetDWriteFamilyName(const RefPtr<IDWriteFontFamily>& aFamily, std::vector<WCHAR>& aOutName)
{
RefPtr<IDWriteLocalizedStrings> names;
HRESULT hr = aFamily->GetFamilyNames(getter_AddRefs(names));
if (FAILED(hr)) {
return false;
}
return GetDWriteName(names, aOutName);
}
bool
UnscaledFontDWrite::GetWRFontDescriptor(WRFontDescriptorOutput aCb, void* aBaton)
{
if (!mFont) {
return false;
}
RefPtr<IDWriteFontFamily> family;
HRESULT hr = mFont->GetFontFamily(getter_AddRefs(family));
if (FAILED(hr)) {
return false;
}
DWRITE_FONT_WEIGHT weight = mFont->GetWeight();
DWRITE_FONT_STRETCH stretch = mFont->GetStretch();
DWRITE_FONT_STYLE style = mFont->GetStyle();
RefPtr<IDWriteFont> match;
hr = family->GetFirstMatchingFont(weight, stretch, style, getter_AddRefs(match));
if (FAILED(hr) ||
match->GetWeight() != weight ||
match->GetStretch() != stretch ||
match->GetStyle() != style) {
return false;
}
std::vector<WCHAR> familyName;
if (!GetDWriteFamilyName(family, familyName)) {
return false;
}
// The style information that identifies the font can be encoded easily in
// less than 32 bits. Since the index is needed for font descriptors, only
// the family name and style information, pass along the style in the index
// data to avoid requiring a more complicated structure packing for it in
// the data payload.
uint32_t index = weight | (stretch << 16) | (style << 24);
aCb(reinterpret_cast<const uint8_t*>(familyName.data()),
(familyName.size() - 1) * sizeof(WCHAR),
index, aBaton);
return true;
}
// 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::SUBPIXEL_POSITION;
if (mFontFace->GetSimulations() & DWRITE_FONT_SIMULATIONS_BOLD) {
options.flags |= wr::FontInstanceFlags::SYNTHETIC_BOLD;
}
if (UseEmbeddedBitmaps()) {
options.flags |= wr::FontInstanceFlags::EMBEDDED_BITMAPS;
}
if (ForceGDIMode()) {
options.flags |= wr::FontInstanceFlags::FORCE_GDI;
}
options.bg_color = wr::ToColorU(Color());
options.synthetic_italics = wr::DegreesToSyntheticItalics(GetSyntheticObliqueAngle());
wr::FontInstancePlatformOptions platformOptions;
platformOptions.gamma = uint16_t(std::round(mGamma * 100.0f));
platformOptions.contrast = uint16_t(std::round(std::min(mContrast, 1.0f) * 100.0f));
*aOutOptions = Some(options);
*aOutPlatformOptions = Some(platformOptions);
return true;
}
// 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,
const FontVariation* aVariations,
uint32_t aNumVariations)
{
auto makeDWriteAxisTag = [](uint32_t aTag) {
return DWRITE_MAKE_FONT_AXIS_TAG((aTag >> 24) & 0xff,
(aTag >> 16) & 0xff,
(aTag >> 8) & 0xff,
aTag & 0xff);
};
RefPtr<IDWriteFontFace5> ff5;
aFace->QueryInterface(__uuidof(IDWriteFontFace5), (void**)getter_AddRefs(ff5));
if (!ff5) {
return nullptr;
}
DWRITE_FONT_SIMULATIONS sims = aFace->GetSimulations();
RefPtr<IDWriteFontResource> res;
if (FAILED(ff5->GetFontResource(getter_AddRefs(res)))) {
return nullptr;
}
std::vector<DWRITE_FONT_AXIS_VALUE> fontAxisValues;
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);
}
RefPtr<IDWriteFontFace5> newFace;
if (FAILED(res->CreateFontFace(sims,
fontAxisValues.data(),
fontAxisValues.size(),
getter_AddRefs(newFace)))) {
return nullptr;
}
return newFace.forget();
}
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;
}
IDWriteFontFace* face = mFontFace;
// If variations are required, we create a separate IDWriteFontFace5 with
// the requested settings applied.
RefPtr<IDWriteFontFace5> ff5;
if (aNumVariations) {
ff5 = CreateFaceWithVariations(mFontFace, aVariations, aNumVariations);
if (ff5) {
face = ff5;
} else {
gfxWarning() << "Failed to create IDWriteFontFace5 with variations.";
}
}
const ScaledFontDWrite::InstanceData *instanceData =
reinterpret_cast<const ScaledFontDWrite::InstanceData*>(aInstanceData);
RefPtr<ScaledFontBase> scaledFont =
new ScaledFontDWrite(face, this, aGlyphSize,
instanceData->mUseEmbeddedBitmap,
instanceData->mForceGDIMode,
nullptr,
instanceData->mGamma,
instanceData->mContrast);
if (mNeedsCairo && !scaledFont->PopulateCairoScaledFont()) {
gfxWarning() << "Unable to create cairo scaled font DWrite font.";
return nullptr;
}
return scaledFont.forget();
}
AntialiasMode
ScaledFontDWrite::GetDefaultAAMode()
{
AntialiasMode defaultMode = GetSystemDefaultAAMode();
if (defaultMode == AntialiasMode::GRAY) {
if (!DoGrayscale(mFontFace, mSize)) {
defaultMode = AntialiasMode::NONE;
}
}
return defaultMode;
}
#ifdef USE_CAIRO_SCALED_FONT
cairo_font_face_t*
ScaledFontDWrite::GetCairoFontFace()
{
if (!mFontFace) {
return nullptr;
}
return cairo_dwrite_font_face_create_for_dwrite_fontface(nullptr, mFontFace);
}
#endif
}
}
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