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Diffstat (limited to 'gfx/thebes/gfxFT2Utils.cpp')
| -rw-r--r-- | gfx/thebes/gfxFT2Utils.cpp | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/gfx/thebes/gfxFT2Utils.cpp b/gfx/thebes/gfxFT2Utils.cpp new file mode 100644 index 0000000000..94403c9dc1 --- /dev/null +++ b/gfx/thebes/gfxFT2Utils.cpp @@ -0,0 +1,157 @@ +/* -*- 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/. */ + +#include "gfxFT2FontBase.h" +#include "gfxFT2Utils.h" +#include "mozilla/Likely.h" + +#ifdef USE_FC_FREETYPE +# include <fontconfig/fcfreetype.h> +#endif + +#include "ft2build.h" +#include FT_MULTIPLE_MASTERS_H + +#include "prlink.h" + +uint32_t gfxFT2LockedFace::GetGlyph(uint32_t aCharCode) { + if (MOZ_UNLIKELY(!mFace)) return 0; + +#ifdef USE_FC_FREETYPE + // 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; failing that, try MS_SYMBOL. + // (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 && + mFace->charmap->encoding != FT_ENCODING_MS_SYMBOL)) { + if (FT_Err_Ok != FT_Select_Charmap(mFace, FT_ENCODING_UNICODE) && + FT_Err_Ok != FT_Select_Charmap(mFace, FT_ENCODING_MS_SYMBOL)) { + NS_WARNING("failed to select Unicode or symbol charmap"); + } + } + + uint32_t gid = FcFreeTypeCharIndex(mFace, aCharCode); +#else + uint32_t gid = FT_Get_Char_Index(mFace, aCharCode); +#endif + if (!gid && mFace->charmap && + mFace->charmap->encoding == FT_ENCODING_MS_SYMBOL) { + if (auto pua = gfxFontUtils::MapLegacySymbolFontCharToPUA(aCharCode)) { + gid = FT_Get_Char_Index(mFace, pua); + } + } + return gid; +} + +typedef FT_UInt (*GetCharVariantFunction)(FT_Face face, FT_ULong charcode, + FT_ULong variantSelector); + +uint32_t gfxFT2LockedFace::GetUVSGlyph(uint32_t aCharCode, + uint32_t aVariantSelector) { + MOZ_ASSERT(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 USE_FC_FREETYPE + // 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; +} + +/*static*/ +void gfxFT2Utils::GetVariationAxes(const FT_MM_Var* aMMVar, + nsTArray<gfxFontVariationAxis>& aAxes) { + MOZ_ASSERT(aAxes.IsEmpty()); + if (!aMMVar) { + return; + } + aAxes.SetCapacity(aMMVar->num_axis); + for (unsigned i = 0; i < aMMVar->num_axis; i++) { + const auto& a = aMMVar->axis[i]; + gfxFontVariationAxis axis; + axis.mMinValue = a.minimum / 65536.0; + axis.mMaxValue = a.maximum / 65536.0; + axis.mDefaultValue = a.def / 65536.0; + axis.mTag = a.tag; + axis.mName = a.name; + aAxes.AppendElement(axis); + } +} + +/*static*/ +void gfxFT2Utils::GetVariationInstances( + gfxFontEntry* aFontEntry, const FT_MM_Var* aMMVar, + nsTArray<gfxFontVariationInstance>& aInstances) { + MOZ_ASSERT(aInstances.IsEmpty()); + if (!aMMVar) { + return; + } + gfxFontUtils::AutoHBBlob nameTable( + aFontEntry->GetFontTable(TRUETYPE_TAG('n', 'a', 'm', 'e'))); + if (!nameTable) { + return; + } + aInstances.SetCapacity(aMMVar->num_namedstyles); + for (unsigned i = 0; i < aMMVar->num_namedstyles; i++) { + const auto& ns = aMMVar->namedstyle[i]; + gfxFontVariationInstance inst; + nsresult rv = + gfxFontUtils::ReadCanonicalName(nameTable, ns.strid, inst.mName); + if (NS_FAILED(rv)) { + continue; + } + inst.mValues.SetCapacity(aMMVar->num_axis); + for (unsigned j = 0; j < aMMVar->num_axis; j++) { + gfxFontVariationValue value; + value.mAxis = aMMVar->axis[j].tag; + value.mValue = ns.coords[j] / 65536.0; + inst.mValues.AppendElement(value); + } + aInstances.AppendElement(inst); + } +} |