gfx/thebes/gfxGraphiteShaper.h

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
   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_GRAPHITESHAPER_H
   7 #define GFX_GRAPHITESHAPER_H
   8
   9 #include "gfxFont.h"
  10
  11 #include "mozilla/gfx/2D.h"
  12
  13 struct gr_face;
  14 struct gr_font;
  15 struct gr_segment;
  16
  17 class gfxGraphiteShaper : public gfxFontShaper {
  18 public:
  19     explicit gfxGraphiteShaper(gfxFont *aFont);
  20     virtual ~gfxGraphiteShaper();
  21
  22     bool ShapeText(DrawTarget      *aDrawTarget,
  23                    const char16_t *aText,
  24                    uint32_t         aOffset,
  25                    uint32_t         aLength,
  26                    Script           aScript,
  27                    bool             aVertical,
  28                    RoundingFlags    aRounding,
  29                    gfxShapedText   *aShapedText) override;
  30
  31     static void Shutdown();
  32
  33 protected:
  34     nsresult SetGlyphsFromSegment(gfxShapedText   *aShapedText,
  35                                   uint32_t         aOffset,
  36                                   uint32_t         aLength,
  37                                   const char16_t *aText,
  38                                   gr_segment      *aSegment,
  39                                   RoundingFlags    aRounding);
  40
  41     static float GrGetAdvance(const void* appFontHandle, uint16_t glyphid);
  42
  43     gr_face *mGrFace; // owned by the font entry; shaper must call
  44                       // gfxFontEntry::ReleaseGrFace when finished with it
  45     gr_font *mGrFont; // owned by the shaper itself
  46
  47     struct CallbackData {
  48         // mFont is a pointer to the font that owns this shaper, so it will
  49         // remain valid throughout our lifetime
  50         gfxFont* MOZ_NON_OWNING_REF mFont;
  51         // initialized to a DrawTarget owned by our caller on every call to
  52         // ShapeText
  53         mozilla::gfx::DrawTarget* MOZ_NON_OWNING_REF mDrawTarget;
  54     };
  55
  56     CallbackData mCallbackData;
  57     bool mFallbackToSmallCaps; // special fallback for the petite-caps case
  58
  59     // Convert HTML 'lang' (BCP47) to Graphite language code
  60     static uint32_t GetGraphiteTagForLang(const nsCString& aLang);
  61     static nsTHashtable<nsUint32HashKey> *sLanguageTags;
  62 };
  63
  64 #endif /* GFX_GRAPHITESHAPER_H */