| /* |
| * 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. |
| */ |
| |
| #ifndef SKFONTHOST_FREETYPE_COMMON_H_ |
| #define SKFONTHOST_FREETYPE_COMMON_H_ |
| |
| #include "SkGlyph.h" |
| #include "SkMutex.h" |
| #include "SkScalerContext.h" |
| #include "SkTypeface.h" |
| #include "SkTypes.h" |
| |
| #include "SkFontMgr.h" |
| |
| #include <ft2build.h> |
| #include FT_FREETYPE_H |
| |
| class SkScalerContext_FreeType_Base : public SkScalerContext { |
| protected: |
| // See http://freetype.sourceforge.net/freetype2/docs/reference/ft2-bitmap_handling.html#FT_Bitmap_Embolden |
| // 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(SkTypeface* typeface, const SkScalerContextEffects& effects, |
| const SkDescriptor *desc) |
| : INHERITED(typeface, effects, desc) |
| {} |
| |
| void generateGlyphImage(FT_Face face, const SkGlyph& glyph); |
| void generateGlyphPath(FT_Face face, SkPath* path); |
| |
| private: |
| typedef SkScalerContext INHERITED; |
| }; |
| |
| class SkTypeface_FreeType : public SkTypeface { |
| public: |
| /** For SkFontMgrs to make use of our ability to extract |
| * name and style from a stream, using FreeType's API. |
| */ |
| class Scanner : ::SkNoncopyable { |
| public: |
| Scanner(); |
| ~Scanner(); |
| struct AxisDefinition { |
| SkFourByteTag fTag; |
| SkFixed fMinimum; |
| SkFixed fDefault; |
| SkFixed fMaximum; |
| }; |
| using AxisDefinitions = SkSTArray<4, AxisDefinition, true>; |
| bool recognizedFont(SkStream* stream, int* numFonts) const; |
| bool scanFont(SkStream* stream, int ttcIndex, |
| SkString* name, SkFontStyle* style, bool* isFixedPitch, |
| AxisDefinitions* axes) const; |
| static void computeAxisValues( |
| AxisDefinitions axisDefinitions, |
| const SkFontMgr::FontParameters::Axis* requestedAxis, int requestedAxisCount, |
| SkFixed* axisValues, |
| const SkString& name); |
| |
| private: |
| FT_Face openFace(SkStream* stream, int ttcIndex, FT_Stream ftStream) const; |
| FT_Library fLibrary; |
| mutable SkMutex fLibraryMutex; |
| }; |
| |
| protected: |
| SkTypeface_FreeType(const SkFontStyle& style, SkFontID uniqueID, bool isFixedPitch) |
| : INHERITED(style, uniqueID, isFixedPitch) |
| {} |
| |
| virtual SkScalerContext* onCreateScalerContext(const SkScalerContextEffects&, |
| const SkDescriptor*) const override; |
| void onFilterRec(SkScalerContextRec*) const override; |
| SkAdvancedTypefaceMetrics* onGetAdvancedTypefaceMetrics( |
| PerGlyphInfo, const uint32_t*, uint32_t) const override; |
| int onGetUPEM() const override; |
| virtual bool onGetKerningPairAdjustments(const uint16_t glyphs[], int count, |
| int32_t adjustments[]) const override; |
| virtual int onCharsToGlyphs(const void* chars, Encoding, uint16_t glyphs[], |
| int glyphCount) const override; |
| int onCountGlyphs() const override; |
| |
| LocalizedStrings* onCreateFamilyNameIterator() const override; |
| |
| int onGetTableTags(SkFontTableTag tags[]) const override; |
| virtual size_t onGetTableData(SkFontTableTag, size_t offset, |
| size_t length, void* data) const override; |
| |
| private: |
| typedef SkTypeface INHERITED; |
| }; |
| |
| #endif // SKFONTHOST_FREETYPE_COMMON_H_ |