зеркало из https://github.com/mozilla/gecko-dev.git
75 строки
2.7 KiB
C++
75 строки
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef GFX_GRAPHITESHAPER_H
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#define GFX_GRAPHITESHAPER_H
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#include "gfxFont.h"
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#include "mozilla/gfx/2D.h"
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#include "ThebesRLBoxTypes.h"
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struct gr_face;
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struct gr_font;
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struct gr_segment;
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class gfxGraphiteShaper : public gfxFontShaper {
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public:
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explicit gfxGraphiteShaper(gfxFont* aFont);
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virtual ~gfxGraphiteShaper();
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bool ShapeText(DrawTarget* aDrawTarget, const char16_t* aText,
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uint32_t aOffset, uint32_t aLength, Script aScript,
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bool aVertical, RoundingFlags aRounding,
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gfxShapedText* aShapedText) override;
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static void Shutdown();
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protected:
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nsresult SetGlyphsFromSegment(gfxShapedText* aShapedText, uint32_t aOffset,
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uint32_t aLength, const char16_t* aText,
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tainted_opaque_gr<char16_t*> t_aText,
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tainted_opaque_gr<gr_segment*> aSegment,
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RoundingFlags aRounding);
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// Graphite is run in a rlbox sandbox. Callback GrGetAdvance must be
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// explicitly permitted. Since the sandbox is owned in gfxFontEntry class,
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// gfxFontEntry needs access to the protected callback.
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friend class gfxFontEntry;
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static tainted_opaque_gr<float> GrGetAdvance(
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rlbox_sandbox_gr& sandbox, tainted_opaque_gr<const void*> appFontHandle,
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tainted_opaque_gr<uint16_t> glyphid);
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tainted_opaque_gr<gr_face*>
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mGrFace; // owned by the font entry; shaper must call
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// gfxFontEntry::ReleaseGrFace when finished with it
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tainted_opaque_gr<gr_font*> mGrFont; // owned by the shaper itself
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// All libGraphite functionality is sandboxed. This is the sandbox instance.
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rlbox_sandbox_gr* mSandbox;
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// Holds the handle to the permitted callback into Firefox for the sandboxed
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// libGraphite
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sandbox_callback_gr<float (*)(const void*, uint16_t)>* mCallback;
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struct CallbackData {
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// mFont is a pointer to the font that owns this shaper, so it will
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// remain valid throughout our lifetime
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gfxFont* MOZ_NON_OWNING_REF mFont;
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};
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CallbackData mCallbackData;
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static thread_local CallbackData* tl_GrGetAdvanceData;
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bool mFallbackToSmallCaps; // special fallback for the petite-caps case
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// Convert HTML 'lang' (BCP47) to Graphite language code
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static uint32_t GetGraphiteTagForLang(const nsCString& aLang);
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static nsTHashtable<nsUint32HashKey>* sLanguageTags;
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};
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#endif /* GFX_GRAPHITESHAPER_H */
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