gfx/thebes/gfxFT2Fonts.h

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef GFX_FT2FONTS_H
   7 #define GFX_FT2FONTS_H
   8
   9 #include "mozilla/MemoryReporting.h"
  10 #include "gfxTypes.h"
  11 #include "gfxFont.h"
  12 #include "gfxFT2FontBase.h"
  13 #include "gfxContext.h"
  14 #include "gfxFontUtils.h"
  15 #include "gfxUserFontSet.h"
  16
  17 class FT2FontEntry;
  18
  19 class gfxFT2Font final : public gfxFT2FontBase {
  20  public:  // new functions
  21   gfxFT2Font(const RefPtr<mozilla::gfx::UnscaledFontFreeType>& aUnscaledFont,
  22              RefPtr<mozilla::gfx::SharedFTFace>&& aFTFace,
  23              FT2FontEntry* aFontEntry, const gfxFontStyle* aFontStyle,
  24              int aLoadFlags);
  25
  26   FT2FontEntry* GetFontEntry();
  27
  28   already_AddRefed<mozilla::gfx::ScaledFont> GetScaledFont(
  29       const TextRunDrawParams& aRunParams) override;
  30
  31   bool ShouldHintMetrics() const override;
  32
  33   void AddSizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf,
  34                               FontCacheSizes* aSizes) const override;
  35   void AddSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf,
  36                               FontCacheSizes* aSizes) const override;
  37
  38  protected:
  39   ~gfxFT2Font() override;
  40
  41   struct CachedGlyphData {
  42     CachedGlyphData() : glyphIndex(0xffffffffU) {}
  43
  44     explicit CachedGlyphData(uint32_t gid) : glyphIndex(gid) {}
  45
  46     uint32_t glyphIndex;
  47     int32_t lsbDelta;
  48     int32_t rsbDelta;
  49     int32_t xAdvance;
  50   };
  51
  52   const CachedGlyphData* GetGlyphDataForChar(FT_Face aFace, uint32_t ch) {
  53     CharGlyphMapEntryType* entry = mCharGlyphCache.PutEntry(ch);
  54
  55     if (!entry) return nullptr;
  56
  57     if (entry->GetData().glyphIndex == 0xffffffffU) {
  58       // this is a new entry, fill it
  59       FillGlyphDataForChar(aFace, ch, entry->GetModifiableData());
  60     }
  61
  62     return &entry->GetData();
  63   }
  64
  65   bool ShapeText(DrawTarget* aDrawTarget, const char16_t* aText,
  66                  uint32_t aOffset, uint32_t aLength, Script aScript,
  67                  nsAtom* aLanguage, bool aVertical, RoundingFlags aRounding,
  68                  gfxShapedText* aShapedText) override;
  69
  70   void FillGlyphDataForChar(FT_Face face, uint32_t ch, CachedGlyphData* gd);
  71
  72   void AddRange(const char16_t* aText, uint32_t aOffset, uint32_t aLength,
  73                 gfxShapedText* aShapedText);
  74
  75   typedef nsBaseHashtableET<nsUint32HashKey, CachedGlyphData>
  76       CharGlyphMapEntryType;
  77   typedef nsTHashtable<CharGlyphMapEntryType> CharGlyphMap;
  78   CharGlyphMap mCharGlyphCache;
  79 };
  80
  81 #endif /* GFX_FT2FONTS_H */