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* Copyright 2006-2012 The Android Open Source Project
* Copyright 2012 Mozilla Foundation
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#include "SkGlyph.h"
#include "SkMutex.h"
#include "SkScalerContext.h"
#include "SkTypeface.h"
#include "SkTypes.h"
#include "SkFontMgr.h"
// These are forward declared to avoid pimpl but also hide the FreeType implementation.
typedef struct FT_LibraryRec_* FT_Library;
typedef struct FT_FaceRec_* FT_Face;
typedef struct FT_StreamRec_* FT_Stream;
typedef signed long FT_Pos;
#ifdef SK_DEBUG
const char* SkTraceFtrGetError(int);
#define SK_TRACEFTR(ERR, MSG, ...) \
SkDebugf("%s:%lu:1: error: 0x%x '%s' " MSG "\n", __FILE__, __LINE__, ERR, \
SkTraceFtrGetError((int)(ERR)), __VA_ARGS__)
#define SK_TRACEFTR(ERR, ...) do { sk_ignore_unused_variable(ERR); } while (false)
class SkScalerContext_FreeType_Base : public SkScalerContext {
// See
// This value was chosen by eyeballing the result in Firefox and trying to match it.
static const FT_Pos kBitmapEmboldenStrength = 1 << 6;
SkScalerContext_FreeType_Base(sk_sp<SkTypeface> typeface, const SkScalerContextEffects& effects,
const SkDescriptor *desc)
: INHERITED(std::move(typeface), effects, desc)
void generateGlyphImage(FT_Face face, const SkGlyph& glyph, const SkMatrix& bitmapTransform);
bool generateGlyphPath(FT_Face face, SkPath* path);
typedef SkScalerContext INHERITED;
class SkTypeface_FreeType : public SkTypeface {
/** For SkFontMgrs to make use of our ability to extract
* name and style from a stream, using FreeType's API.
class Scanner : ::SkNoncopyable {
struct AxisDefinition {
SkFourByteTag fTag;
SkFixed fMinimum;
SkFixed fDefault;
SkFixed fMaximum;
using AxisDefinitions = SkSTArray<4, AxisDefinition, true>;
bool recognizedFont(SkStreamAsset* stream, int* numFonts) const;
bool scanFont(SkStreamAsset* stream, int ttcIndex,
SkString* name, SkFontStyle* style, bool* isFixedPitch,
AxisDefinitions* axes) const;
static void computeAxisValues(
AxisDefinitions axisDefinitions,
const SkFontArguments::VariationPosition position,
SkFixed* axisValues,
const SkString& name);
static bool GetAxes(FT_Face face, AxisDefinitions* axes);
FT_Face openFace(SkStreamAsset* stream, int ttcIndex, FT_Stream ftStream) const;
FT_Library fLibrary;
mutable SkMutex fLibraryMutex;
SkTypeface_FreeType(const SkFontStyle& style, bool isFixedPitch)
: INHERITED(style, isFixedPitch)
std::unique_ptr<SkFontData> cloneFontData(const SkFontArguments&) const;
virtual SkScalerContext* onCreateScalerContext(const SkScalerContextEffects&,
const SkDescriptor*) const override;
void onFilterRec(SkScalerContextRec*) const override;
void getGlyphToUnicodeMap(SkUnichar*) const override;
std::unique_ptr<SkAdvancedTypefaceMetrics> onGetAdvancedMetrics() const override;
void getPostScriptGlyphNames(SkString* dstArray) const override;
int onGetUPEM() const override;
bool onGetKerningPairAdjustments(const uint16_t glyphs[], int count,
int32_t adjustments[]) const override;
int onCharsToGlyphs(const void* chars, Encoding, uint16_t glyphs[],
int glyphCount) const override;
int onCountGlyphs() const override;
LocalizedStrings* onCreateFamilyNameIterator() const override;
int onGetVariationDesignPosition(SkFontArguments::VariationPosition::Coordinate coordinates[],
int coordinateCount) const override;
int onGetTableTags(SkFontTableTag tags[]) const override;
size_t onGetTableData(SkFontTableTag, size_t offset,
size_t length, void* data) const override;
typedef SkTypeface INHERITED;