/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef GFX_GRAPHITESHAPER_H
#define GFX_GRAPHITESHAPER_H

#include "gfxFont.h"

#include "mozilla/gfx/2D.h"

struct gr_face;
struct gr_font;
struct gr_segment;

class gfxGraphiteShaper : public gfxFontShaper {
 public:
  explicit gfxGraphiteShaper(gfxFont* aFont);
  virtual ~gfxGraphiteShaper();

  bool ShapeText(DrawTarget* aDrawTarget, const char16_t* aText,
                 uint32_t aOffset, uint32_t aLength, Script aScript,
                 bool aVertical, RoundingFlags aRounding,
                 gfxShapedText* aShapedText) override;

  static void Shutdown();

 protected:
  nsresult SetGlyphsFromSegment(gfxShapedText* aShapedText, uint32_t aOffset,
                                uint32_t aLength, const char16_t* aText,
                                gr_segment* aSegment, RoundingFlags aRounding);

  static float GrGetAdvance(const void* appFontHandle, uint16_t glyphid);

  gr_face* mGrFace;  // owned by the font entry; shaper must call
                     // gfxFontEntry::ReleaseGrFace when finished with it
  gr_font* mGrFont;  // owned by the shaper itself

  struct CallbackData {
    // mFont is a pointer to the font that owns this shaper, so it will
    // remain valid throughout our lifetime
    gfxFont* MOZ_NON_OWNING_REF mFont;
  };

  CallbackData mCallbackData;
  bool mFallbackToSmallCaps;  // special fallback for the petite-caps case

  // Convert HTML 'lang' (BCP47) to Graphite language code
  static uint32_t GetGraphiteTagForLang(const nsCString& aLang);
  static nsTHashtable<nsUint32HashKey>* sLanguageTags;
};

#endif /* GFX_GRAPHITESHAPER_H */