gfxGraphiteShaper.h

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/* -*- 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"

#include "nsTHashSet.h"

#include "ThebesRLBoxTypes.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,

                 nsAtom* aLanguage, 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,

                                tainted_opaque_gr<char16_t*> t_aText,

                                tainted_opaque_gr<gr_segment*> aSegment,

                                RoundingFlags aRounding);

  // Graphite is run in a rlbox sandbox. Callback GrGetAdvance must be

  // explicitly permitted. Since the sandbox is owned in gfxFontEntry class,

  // gfxFontEntry needs access to the protected callback.

  friend class gfxFontEntryCallbacks;

  static tainted_opaque_gr<float> GrGetAdvance(

      rlbox_sandbox_gr& sandbox, tainted_opaque_gr<const void*> appFontHandle,

      tainted_opaque_gr<uint16_t> glyphid);

  tainted_opaque_gr<gr_face*>

      mGrFace;  // owned by the font entry; shaper must call

                // gfxFontEntry::ReleaseGrFace when finished with it

  tainted_opaque_gr<gr_font*> mGrFont;  // owned by the shaper itself

  // All libGraphite functionality is sandboxed. This is the sandbox instance.

  rlbox_sandbox_gr* mSandbox;

  // Holds the handle to the permitted callback into Firefox for the sandboxed

  // libGraphite

  sandbox_callback_gr<float (*)(const void*, uint16_t)>* mCallback;

  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;

  static thread_local CallbackData* tl_GrGetAdvanceData;

  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 nsTHashSet<uint32_t>* sLanguageTags;

};

#endif /* GFX_GRAPHITESHAPER_H */