зеркало из https://github.com/mozilla/gecko-dev.git
99 строки
3.2 KiB
C++
99 строки
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
|
|
* 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/. */
|
|
|
|
#include "gfxFT2FontBase.h"
|
|
#include "gfxFT2Utils.h"
|
|
#include "mozilla/Likely.h"
|
|
|
|
#ifdef HAVE_FONTCONFIG_FCFREETYPE_H
|
|
#include <fontconfig/fcfreetype.h>
|
|
#endif
|
|
|
|
#include "prlink.h"
|
|
|
|
uint32_t
|
|
gfxFT2LockedFace::GetGlyph(uint32_t aCharCode)
|
|
{
|
|
if (MOZ_UNLIKELY(!mFace))
|
|
return 0;
|
|
|
|
#ifdef HAVE_FONTCONFIG_FCFREETYPE_H
|
|
// FcFreeTypeCharIndex will search starting from the most recently
|
|
// selected charmap. This can cause non-determistic behavior when more
|
|
// than one charmap supports a character but with different glyphs, as
|
|
// with older versions of MS Gothic, for example. Always prefer a Unicode
|
|
// charmap, if there is one. (FcFreeTypeCharIndex usually does the
|
|
// appropriate Unicode conversion, but some fonts have non-Roman glyphs
|
|
// for FT_ENCODING_APPLE_ROMAN characters.)
|
|
if (!mFace->charmap || mFace->charmap->encoding != FT_ENCODING_UNICODE) {
|
|
FT_Select_Charmap(mFace, FT_ENCODING_UNICODE);
|
|
}
|
|
|
|
return FcFreeTypeCharIndex(mFace, aCharCode);
|
|
#else
|
|
return FT_Get_Char_Index(mFace, aCharCode);
|
|
#endif
|
|
}
|
|
|
|
typedef FT_UInt (*GetCharVariantFunction)(FT_Face face,
|
|
FT_ULong charcode,
|
|
FT_ULong variantSelector);
|
|
|
|
uint32_t
|
|
gfxFT2LockedFace::GetUVSGlyph(uint32_t aCharCode, uint32_t aVariantSelector)
|
|
{
|
|
NS_PRECONDITION(aVariantSelector, "aVariantSelector should not be NULL");
|
|
|
|
if (MOZ_UNLIKELY(!mFace))
|
|
return 0;
|
|
|
|
// This function is available from FreeType 2.3.6 (June 2008).
|
|
static CharVariantFunction sGetCharVariantPtr = FindCharVariantFunction();
|
|
if (!sGetCharVariantPtr)
|
|
return 0;
|
|
|
|
#ifdef HAVE_FONTCONFIG_FCFREETYPE_H
|
|
// FcFreeTypeCharIndex may have changed the selected charmap.
|
|
// FT_Face_GetCharVariantIndex needs a unicode charmap.
|
|
if (!mFace->charmap || mFace->charmap->encoding != FT_ENCODING_UNICODE) {
|
|
FT_Select_Charmap(mFace, FT_ENCODING_UNICODE);
|
|
}
|
|
#endif
|
|
|
|
return (*sGetCharVariantPtr)(mFace, aCharCode, aVariantSelector);
|
|
}
|
|
|
|
gfxFT2LockedFace::CharVariantFunction
|
|
gfxFT2LockedFace::FindCharVariantFunction()
|
|
{
|
|
// This function is available from FreeType 2.3.6 (June 2008).
|
|
PRLibrary *lib = nullptr;
|
|
CharVariantFunction function =
|
|
reinterpret_cast<CharVariantFunction>
|
|
(PR_FindFunctionSymbolAndLibrary("FT_Face_GetCharVariantIndex", &lib));
|
|
if (!lib) {
|
|
return nullptr;
|
|
}
|
|
|
|
FT_Int major;
|
|
FT_Int minor;
|
|
FT_Int patch;
|
|
FT_Library_Version(mFace->glyph->library, &major, &minor, &patch);
|
|
|
|
// Versions 2.4.0 to 2.4.3 crash if configured with
|
|
// FT_CONFIG_OPTION_OLD_INTERNALS. Presence of the symbol FT_Alloc
|
|
// indicates FT_CONFIG_OPTION_OLD_INTERNALS.
|
|
if (major == 2 && minor == 4 && patch < 4 &&
|
|
PR_FindFunctionSymbol(lib, "FT_Alloc")) {
|
|
function = nullptr;
|
|
}
|
|
|
|
// Decrement the reference count incremented in
|
|
// PR_FindFunctionSymbolAndLibrary.
|
|
PR_UnloadLibrary(lib);
|
|
|
|
return function;
|
|
}
|