gfx/thebes/gfxGraphiteShaper.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_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, const char16_t* aText,
  23                  uint32_t aOffset, uint32_t aLength, Script aScript,
  24                  bool aVertical, RoundingFlags aRounding,
  25                  gfxShapedText* aShapedText) override;
  26
  27   static void Shutdown();
  28
  29  protected:
  30   nsresult SetGlyphsFromSegment(gfxShapedText* aShapedText, uint32_t aOffset,
  31                                 uint32_t aLength, const char16_t* aText,
  32                                 gr_segment* aSegment, RoundingFlags aRounding);
  33
  34   static float GrGetAdvance(const void* appFontHandle, uint16_t glyphid);
  35
  36   gr_face* mGrFace;  // owned by the font entry; shaper must call
  37                      // gfxFontEntry::ReleaseGrFace when finished with it
  38   gr_font* mGrFont;  // owned by the shaper itself
  39
  40   struct CallbackData {
  41     // mFont is a pointer to the font that owns this shaper, so it will
  42     // remain valid throughout our lifetime
  43     gfxFont* MOZ_NON_OWNING_REF mFont;
  44   };
  45
  46   CallbackData mCallbackData;
  47   bool mFallbackToSmallCaps;  // special fallback for the petite-caps case
  48
  49   // Convert HTML 'lang' (BCP47) to Graphite language code
  50   static uint32_t GetGraphiteTagForLang(const nsCString& aLang);
  51   static nsTHashtable<nsUint32HashKey>* sLanguageTags;
  52 };
  53
  54 #endif /* GFX_GRAPHITESHAPER_H */