| /* |
| * Copyright (C) 2008 Alp Toker <alp@atoker.com> |
| * Copyright (C) 2010 Igalia S.L. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #include "config.h" |
| #include "FontCustomPlatformData.h" |
| |
| #include "CairoUtilities.h" |
| #include "FontCacheFreeType.h" |
| #include "FontDescription.h" |
| #include "FontPlatformData.h" |
| #include "SharedBuffer.h" |
| #include <cairo-ft.h> |
| #include <cairo.h> |
| #include <ft2build.h> |
| #include FT_MODULE_H |
| #include <mutex> |
| |
| namespace WebCore { |
| |
| static void releaseCustomFontData(void* data) |
| { |
| static_cast<SharedBuffer*>(data)->deref(); |
| } |
| |
| static cairo_user_data_key_t freeTypeFaceKey; |
| |
| FontCustomPlatformData::FontCustomPlatformData(FT_Face freeTypeFace, SharedBuffer& buffer) |
| : m_fontFace(adoptRef(cairo_ft_font_face_create_for_ft_face(freeTypeFace, FT_LOAD_DEFAULT))) |
| { |
| buffer.ref(); // This is balanced by the buffer->deref() in releaseCustomFontData. |
| static cairo_user_data_key_t bufferKey; |
| cairo_font_face_set_user_data(m_fontFace.get(), &bufferKey, &buffer, |
| static_cast<cairo_destroy_func_t>(releaseCustomFontData)); |
| |
| // Cairo doesn't do FreeType reference counting, so we need to ensure that when |
| // this cairo_font_face_t is destroyed, it cleans up the FreeType face as well. |
| cairo_font_face_set_user_data(m_fontFace.get(), &freeTypeFaceKey, freeTypeFace, |
| reinterpret_cast<cairo_destroy_func_t>(reinterpret_cast<void(*)(void)>(FT_Done_Face))); |
| } |
| |
| static FcPattern* defaultFontconfigOptions() |
| { |
| // Get some generic default settings from fontconfig for web fonts. Strategy |
| // from Behdad Esfahbod in https://code.google.com/p/chromium/issues/detail?id=173207#c35 |
| // For web fonts, the hint style is overridden in FontCustomPlatformData::FontCustomPlatformData |
| // so Fontconfig will not affect the hint style, but it may disable hinting completely. |
| static FcPattern* pattern = nullptr; |
| static std::once_flag flag; |
| std::call_once(flag, [](FcPattern*) { |
| pattern = FcPatternCreate(); |
| FcConfigSubstitute(nullptr, pattern, FcMatchPattern); |
| cairo_ft_font_options_substitute(getDefaultCairoFontOptions(), pattern); |
| FcDefaultSubstitute(pattern); |
| FcPatternDel(pattern, FC_FAMILY); |
| FcConfigSubstitute(nullptr, pattern, FcMatchFont); |
| }, pattern); |
| return pattern; |
| } |
| |
| FontPlatformData FontCustomPlatformData::fontPlatformData(const FontDescription& description, bool bold, bool italic, const FontFeatureSettings&, const FontVariantSettings&, FontSelectionSpecifiedCapabilities) |
| { |
| auto* freeTypeFace = static_cast<FT_Face>(cairo_font_face_get_user_data(m_fontFace.get(), &freeTypeFaceKey)); |
| ASSERT(freeTypeFace); |
| RefPtr<FcPattern> pattern = defaultFontconfigOptions(); |
| #if ENABLE(VARIATION_FONTS) |
| auto variants = buildVariationSettings(freeTypeFace, description); |
| if (!variants.isEmpty()) { |
| pattern = adoptRef(FcPatternDuplicate(pattern.get())); |
| FcPatternAddString(pattern.get(), FC_FONT_VARIATIONS, reinterpret_cast<const FcChar8*>(variants.utf8().data())); |
| } |
| #endif |
| return FontPlatformData(m_fontFace.get(), pattern.get(), description.computedPixelSize(), freeTypeFace->face_flags & FT_FACE_FLAG_FIXED_WIDTH, bold, italic, description.orientation()); |
| } |
| |
| static bool initializeFreeTypeLibrary(FT_Library& library) |
| { |
| // https://www.freetype.org/freetype2/docs/design/design-4.html |
| // https://lists.nongnu.org/archive/html/freetype-devel/2004-10/msg00022.html |
| |
| FT_Memory memory = bitwise_cast<FT_Memory>(ft_smalloc(sizeof(*memory))); |
| if (!memory) |
| return false; |
| |
| memory->user = nullptr; |
| memory->alloc = [](FT_Memory, long size) -> void* { |
| return fastMalloc(size); |
| }; |
| memory->free = [](FT_Memory, void* block) -> void { |
| fastFree(block); |
| }; |
| memory->realloc = [](FT_Memory, long, long newSize, void* block) -> void* { |
| return fastRealloc(block, newSize); |
| }; |
| |
| if (FT_New_Library(memory, &library)) { |
| ft_sfree(memory); |
| return false; |
| } |
| |
| FT_Add_Default_Modules(library); |
| return true; |
| } |
| |
| std::unique_ptr<FontCustomPlatformData> createFontCustomPlatformData(SharedBuffer& buffer, const String&) |
| { |
| static FT_Library library; |
| if (!library && !initializeFreeTypeLibrary(library)) { |
| library = nullptr; |
| return nullptr; |
| } |
| |
| FT_Face freeTypeFace; |
| if (FT_New_Memory_Face(library, reinterpret_cast<const FT_Byte*>(buffer.data()), buffer.size(), 0, &freeTypeFace)) |
| return nullptr; |
| return makeUnique<FontCustomPlatformData>(freeTypeFace, buffer); |
| } |
| |
| bool FontCustomPlatformData::supportsFormat(const String& format) |
| { |
| return equalLettersIgnoringASCIICase(format, "truetype") |
| || equalLettersIgnoringASCIICase(format, "opentype") |
| #if USE(WOFF2) |
| || equalLettersIgnoringASCIICase(format, "woff2") |
| #if ENABLE(VARIATION_FONTS) |
| || equalLettersIgnoringASCIICase(format, "woff2-variations") |
| #endif |
| #endif |
| #if ENABLE(VARIATION_FONTS) |
| || equalLettersIgnoringASCIICase(format, "woff-variations") |
| || equalLettersIgnoringASCIICase(format, "truetype-variations") |
| || equalLettersIgnoringASCIICase(format, "opentype-variations") |
| #endif |
| || equalLettersIgnoringASCIICase(format, "woff"); |
| } |
| |
| } |