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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 gfxFontEntry;
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 */