зеркало из https://github.com/mozilla/gecko-dev.git
67 строки
2.3 KiB
C++
67 строки
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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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_FT2UTILS_H
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#define GFX_FT2UTILS_H
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#include "cairo-ft.h"
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#include "gfxFT2FontBase.h"
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#include "mozilla/Likely.h"
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// Rounding and truncation functions for a FreeType fixed point number
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// (FT26Dot6) stored in a 32bit integer with high 26 bits for the integer
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// part and low 6 bits for the fractional part.
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#define FLOAT_FROM_26_6(x) ((x) / 64.0)
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#define FLOAT_FROM_16_16(x) ((x) / 65536.0)
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#define ROUND_26_6_TO_INT(x) ((x) >= 0 ? ((32 + (x)) >> 6) \
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: -((32 - (x)) >> 6))
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typedef struct FT_FaceRec_* FT_Face;
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/**
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* BEWARE: Recursively locking with gfxFT2LockedFace is not supported.
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* Do not instantiate gfxFT2LockedFace within the scope of another instance.
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* Do not attempt to call into Cairo within the scope of gfxFT2LockedFace,
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* as that may accidentally try to re-lock the face within Cairo itself
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* and thus deadlock.
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*/
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class MOZ_STACK_CLASS gfxFT2LockedFace {
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public:
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explicit gfxFT2LockedFace(gfxFT2FontBase *aFont) :
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mGfxFont(aFont),
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mFace(cairo_ft_scaled_font_lock_face(aFont->GetCairoScaledFont()))
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{ }
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~gfxFT2LockedFace()
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{
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if (mFace) {
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cairo_ft_scaled_font_unlock_face(mGfxFont->GetCairoScaledFont());
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}
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}
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FT_Face get() { return mFace; };
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/**
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* Get the glyph id for a Unicode character representable by a single
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* glyph, or return zero if there is no such glyph. This does no caching,
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* so you probably want gfxFcFont::GetGlyph.
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*/
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uint32_t GetGlyph(uint32_t aCharCode);
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/**
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* Returns 0 if there is no variation selector cmap subtable.
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*/
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uint32_t GetUVSGlyph(uint32_t aCharCode, uint32_t aVariantSelector);
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protected:
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typedef FT_UInt (*CharVariantFunction)(FT_Face face,
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FT_ULong charcode,
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FT_ULong variantSelector);
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CharVariantFunction FindCharVariantFunction();
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gfxFT2FontBase* MOZ_NON_OWNING_REF mGfxFont; // owned by caller
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FT_Face mFace;
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};
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#endif /* GFX_FT2UTILS_H */
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