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The Tor Browser
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gfxFT2Fonts.h (2656B)

      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 */