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 : 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   virtual ~gfxFT2Font();
  26
  27   FT2FontEntry* GetFontEntry();
  28
  29   already_AddRefed<mozilla::gfx::ScaledFont> GetScaledFont(
  30       const TextRunDrawParams& aRunParams) override;
  31
  32   bool ShouldHintMetrics() const override;
  33
  34   void AddSizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf,
  35                               FontCacheSizes* aSizes) const override;
  36   void AddSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf,
  37                               FontCacheSizes* aSizes) const override;
  38
  39  protected:
  40   struct CachedGlyphData {
  41     CachedGlyphData() : glyphIndex(0xffffffffU) {}
  42
  43     explicit CachedGlyphData(uint32_t gid) : glyphIndex(gid) {}
  44
  45     uint32_t glyphIndex;
  46     int32_t lsbDelta;
  47     int32_t rsbDelta;
  48     int32_t xAdvance;
  49   };
  50
  51   const CachedGlyphData* GetGlyphDataForChar(FT_Face aFace, uint32_t ch) {
  52     CharGlyphMapEntryType* entry = mCharGlyphCache.PutEntry(ch);
  53
  54     if (!entry) return nullptr;
  55
  56     if (entry->GetData().glyphIndex == 0xffffffffU) {
  57       // this is a new entry, fill it
  58       FillGlyphDataForChar(aFace, ch, entry->GetModifiableData());
  59     }
  60
  61     return &entry->GetData();
  62   }
  63
  64   bool ShapeText(DrawTarget* aDrawTarget, const char16_t* aText,
  65                  uint32_t aOffset, uint32_t aLength, Script aScript,
  66                  nsAtom* aLanguage, bool aVertical, RoundingFlags aRounding,
  67                  gfxShapedText* aShapedText) override;
  68
  69   void FillGlyphDataForChar(FT_Face face, uint32_t ch, CachedGlyphData* gd);
  70
  71   void AddRange(const char16_t* aText, uint32_t aOffset, uint32_t aLength,
  72                 gfxShapedText* aShapedText);
  73
  74   typedef nsBaseHashtableET<nsUint32HashKey, CachedGlyphData>
  75       CharGlyphMapEntryType;
  76   typedef nsTHashtable<CharGlyphMapEntryType> CharGlyphMap;
  77   CharGlyphMap mCharGlyphCache;
  78 };
  79
  80 #endif /* GFX_FT2FONTS_H */