| // Copyright 2017 Google Inc. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "cobalt/renderer/rasterizer/skia/skia/src/ports/SkFontStyleSet_cobalt.h" |
| |
| #include <ft2build.h> |
| #include FT_FREETYPE_H |
| |
| #include <cmath> |
| #include <limits> |
| |
| #include "base/debug/trace_event.h" |
| #include "base/logging.h" |
| #include "base/memory/ref_counted.h" |
| #include "cobalt/renderer/rasterizer/skia/skia/src/ports/SkTypeface_cobalt.h" |
| #include "SkOSFile.h" |
| |
| namespace { |
| |
| int MatchScore(const SkFontStyle& pattern, const SkFontStyle& candidate) { |
| // This logic is taken from Skia and is based upon the algorithm specified |
| // within the spec: |
| // https://www.w3.org/TR/css-fonts-3/#font-matching-algorithm |
| |
| int score = 0; |
| |
| // CSS style (italic/oblique) |
| // Being italic trumps all valid weights which are not italic. |
| // Note that newer specs differentiate between italic and oblique. |
| if (pattern.isItalic() == candidate.isItalic()) { |
| score += 1001; |
| } |
| |
| // The 'closer' to the target weight, the higher the score. |
| // 1000 is the 'heaviest' recognized weight |
| if (pattern.weight() == candidate.weight()) { |
| score += 1000; |
| } else if (pattern.weight() <= 500) { |
| if (400 <= pattern.weight() && pattern.weight() < 450) { |
| if (450 <= candidate.weight() && candidate.weight() <= 500) { |
| score += 500; |
| } |
| } |
| if (candidate.weight() <= pattern.weight()) { |
| score += 1000 - pattern.weight() + candidate.weight(); |
| } else { |
| score += 1000 - candidate.weight(); |
| } |
| } else if (pattern.weight() > 500) { |
| if (candidate.weight() > pattern.weight()) { |
| score += 1000 + pattern.weight() - candidate.weight(); |
| } else { |
| score += candidate.weight(); |
| } |
| } |
| |
| return score; |
| } |
| |
| } // namespace |
| |
| // These functions are used by FreeType during FT_Open_Face. |
| extern "C" { |
| |
| static unsigned long sk_cobalt_ft_stream_io(FT_Stream ftStream, |
| unsigned long offset, |
| unsigned char* buffer, |
| unsigned long count) { |
| SkStreamAsset* stream = |
| static_cast<SkStreamAsset*>(ftStream->descriptor.pointer); |
| stream->seek(offset); |
| return stream->read(buffer, count); |
| } |
| |
| static void sk_cobalt_ft_stream_close(FT_Stream) {} |
| } |
| |
| SkFontStyleSet_Cobalt::SkFontStyleSet_Cobalt( |
| const FontFamily& family, const char* base_path, |
| SkFileMemoryChunkStreamManager* const local_typeface_stream_manager, |
| SkMutex* const manager_owned_mutex) |
| : local_typeface_stream_manager_(local_typeface_stream_manager), |
| manager_owned_mutex_(manager_owned_mutex), |
| is_fallback_family_(family.is_fallback_family), |
| language_(family.language), |
| page_ranges_(family.page_ranges), |
| is_character_map_generated_(!is_fallback_family_) { |
| TRACE_EVENT0("cobalt::renderer", |
| "SkFontStyleSet_Cobalt::SkFontStyleSet_Cobalt()"); |
| DCHECK(manager_owned_mutex_); |
| |
| if (family.names.count() == 0) { |
| return; |
| } |
| |
| family_name_ = family.names[0]; |
| |
| for (int i = 0; i < family.fonts.count(); ++i) { |
| const FontFileInfo& font_file = family.fonts[i]; |
| |
| SkString file_path(SkOSPath::Join(base_path, font_file.file_name.c_str())); |
| |
| // Validate that the file exists at this location. If it does not, then skip |
| // over it; it isn't being added to the set. |
| if (!sk_exists(file_path.c_str(), kRead_SkFILE_Flag)) { |
| DLOG(INFO) << "Failed to find font file: " << file_path.c_str(); |
| continue; |
| } |
| |
| SkFontStyle style(font_file.weight, SkFontStyle::kNormal_Width, |
| font_file.style == FontFileInfo::kItalic_FontStyle |
| ? SkFontStyle::kItalic_Slant |
| : SkFontStyle::kUpright_Slant); |
| |
| std::string full_font_name; |
| if (!font_file.full_font_name.isEmpty()) { |
| full_font_name = std::string(font_file.full_font_name.c_str(), |
| font_file.full_font_name.size()); |
| } |
| std::string postscript_name; |
| if (!font_file.postscript_name.isEmpty()) { |
| postscript_name = std::string(font_file.postscript_name.c_str(), |
| font_file.postscript_name.size()); |
| } |
| |
| styles_.push_back().reset( |
| SkNEW_ARGS(SkFontStyleSetEntry_Cobalt, |
| (file_path, font_file.index, style, full_font_name, |
| postscript_name, font_file.disable_synthetic_bolding))); |
| } |
| } |
| |
| int SkFontStyleSet_Cobalt::count() { |
| SkAutoMutexAcquire scoped_mutex(*manager_owned_mutex_); |
| return styles_.count(); |
| } |
| |
| void SkFontStyleSet_Cobalt::getStyle(int index, SkFontStyle* style, |
| SkString* name) { |
| // SkFontStyleSet_Cobalt does not support publicly interacting with entries |
| // via index, as entries can potentially be removed, thereby invalidating the |
| // indices. |
| NOTREACHED(); |
| } |
| |
| SkTypeface* SkFontStyleSet_Cobalt::createTypeface(int index) { |
| // SkFontStyleSet_Cobalt does not support publicly interacting with entries |
| // via index, as entries can potentially be removed, thereby invalidating the |
| // indices. |
| NOTREACHED(); |
| return NULL; |
| } |
| |
| SkTypeface* SkFontStyleSet_Cobalt::matchStyle(const SkFontStyle& pattern) { |
| SkAutoMutexAcquire scoped_mutex(*manager_owned_mutex_); |
| return MatchStyleWithoutLocking(pattern); |
| } |
| |
| SkTypeface* SkFontStyleSet_Cobalt::MatchStyleWithoutLocking( |
| const SkFontStyle& pattern) { |
| SkTypeface* typeface = NULL; |
| while (typeface == NULL && styles_.count() > 0) { |
| typeface = TryRetrieveTypefaceAndRemoveStyleOnFailure( |
| GetClosestStyleIndex(pattern)); |
| } |
| return typeface; |
| } |
| |
| SkTypeface* SkFontStyleSet_Cobalt::MatchFullFontName(const std::string& name) { |
| for (int i = 0; i < styles_.count(); ++i) { |
| if (styles_[i]->full_font_name == name) { |
| return TryRetrieveTypefaceAndRemoveStyleOnFailure(i); |
| } |
| } |
| return NULL; |
| } |
| |
| SkTypeface* SkFontStyleSet_Cobalt::MatchFontPostScriptName( |
| const std::string& name) { |
| for (int i = 0; i < styles_.count(); ++i) { |
| if (styles_[i]->font_postscript_name == name) { |
| return TryRetrieveTypefaceAndRemoveStyleOnFailure(i); |
| } |
| } |
| return NULL; |
| } |
| |
| SkTypeface* SkFontStyleSet_Cobalt::TryRetrieveTypefaceAndRemoveStyleOnFailure( |
| int style_index) { |
| DCHECK(style_index >= 0 && style_index < styles_.count()); |
| SkFontStyleSetEntry_Cobalt* style = styles_[style_index]; |
| // If the typeface doesn't already exist, then attempt to create it. |
| if (style->typeface == NULL) { |
| CreateStreamProviderTypeface(style); |
| // If the creation attempt failed and the typeface is still NULL, then |
| // remove the entry from the set's styles. |
| if (style->typeface == NULL) { |
| styles_[style_index].swap(&styles_.back()); |
| styles_.pop_back(); |
| return NULL; |
| } |
| } |
| return SkRef(style->typeface.get()); |
| } |
| |
| bool SkFontStyleSet_Cobalt::ContainsTypeface(const SkTypeface* typeface) { |
| for (int i = 0; i < styles_.count(); ++i) { |
| if (styles_[i]->typeface == typeface) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| bool SkFontStyleSet_Cobalt::ContainsCharacter(const SkFontStyle& style, |
| SkUnichar character) { |
| // If page ranges exist for this style set, then verify that this character |
| // falls within the ranges. Otherwise, the style set is treated as having a |
| // page range containing all characters. |
| size_t num_ranges = page_ranges_.count(); |
| if (num_ranges > 0) { |
| int16 page = font_character_map::GetPage(character); |
| |
| // Verify that the last page range is not less than the page containing the |
| // character. If it's less, then this character can't be contained |
| // within the pages. Otherwise, this last range acts as a sentinel for the |
| // search. |
| if (page_ranges_[num_ranges - 1].second < page) { |
| return false; |
| } |
| |
| int range_index = 0; |
| while (page_ranges_[range_index].second < page) { |
| ++range_index; |
| } |
| |
| if (page_ranges_[range_index].first > page) { |
| return false; |
| } |
| } |
| |
| // If this point is reached, then the character is contained within one of |
| // the font style set's page ranges. Now, verify that the specific character |
| // is supported by the font style set. |
| |
| // The character map is lazily generated. Generate it now if it isn't already |
| // generated. |
| if (!is_character_map_generated_) { |
| TRACE_EVENT0("cobalt::renderer", |
| "SkFontStyleSet_Cobalt::ContainsCharacter() and " |
| "!is_character_map_generated_"); |
| // Attempt to load the closest font style from the set. If it fails to load, |
| // it will be removed from the set and, as long as font styles remain in the |
| // set, the logic will be attempted again. |
| while (styles_.count() > 0) { |
| int style_index = GetClosestStyleIndex(style); |
| SkFontStyleSetEntry_Cobalt* closest_style = styles_[style_index]; |
| |
| SkFileMemoryChunkStreamProvider* stream_provider = |
| local_typeface_stream_manager_->GetStreamProvider( |
| closest_style->font_file_path.c_str()); |
| |
| // Create a snapshot prior to loading any additional memory chunks. In the |
| // case where the typeface does not end up being created, this enables the |
| // stream provider to purge newly created memory chunks, while retaining |
| // any pre-existing ones. |
| scoped_ptr<const SkFileMemoryChunks> memory_chunks_snapshot( |
| stream_provider->CreateMemoryChunksSnapshot()); |
| |
| SkAutoTUnref<SkFileMemoryChunkStream> stream( |
| stream_provider->OpenStream()); |
| if (GenerateStyleFaceInfo(closest_style, stream)) { |
| if (CharacterMapContainsCharacter(character)) { |
| CreateStreamProviderTypeface(closest_style, stream_provider); |
| return true; |
| } else { |
| // If a typeface was not created, destroy the stream and purge any |
| // newly created memory chunks. The stream must be destroyed first or |
| // it will retain references to memory chunks, preventing them from |
| // being purged. |
| stream.reset(NULL); |
| stream_provider->PurgeUnusedMemoryChunks(); |
| return false; |
| } |
| } |
| |
| styles_[style_index].swap(&styles_.back()); |
| styles_.pop_back(); |
| } |
| |
| is_character_map_generated_ = true; |
| } |
| |
| return CharacterMapContainsCharacter(character); |
| } |
| |
| bool SkFontStyleSet_Cobalt::CharacterMapContainsCharacter(SkUnichar character) { |
| font_character_map::CharacterMap::iterator page_iterator = |
| character_map_.find(font_character_map::GetPage(character)); |
| return page_iterator != character_map_.end() && |
| page_iterator->second.test( |
| font_character_map::GetPageCharacterIndex(character)); |
| } |
| |
| bool SkFontStyleSet_Cobalt::GenerateStyleFaceInfo( |
| SkFontStyleSetEntry_Cobalt* style, SkStreamAsset* stream) { |
| if (style->is_face_info_generated) { |
| return true; |
| } |
| |
| TRACE_EVENT0("cobalt::renderer", "GenerateStyleFaceInfo()"); |
| |
| FT_Library freetype_lib; |
| if (FT_Init_FreeType(&freetype_lib) != 0) { |
| return false; |
| } |
| |
| FT_StreamRec streamRec; |
| memset(&streamRec, 0, sizeof(streamRec)); |
| streamRec.size = stream->getLength(); |
| streamRec.descriptor.pointer = stream; |
| streamRec.read = sk_cobalt_ft_stream_io; |
| streamRec.close = sk_cobalt_ft_stream_close; |
| |
| FT_Open_Args args; |
| memset(&args, 0, sizeof(args)); |
| args.flags = FT_OPEN_STREAM; |
| args.stream = &streamRec; |
| |
| FT_Face face; |
| FT_Error err = FT_Open_Face(freetype_lib, &args, style->face_index, &face); |
| if (err) { |
| FT_Done_FreeType(freetype_lib); |
| return false; |
| } |
| |
| int face_style = SkTypeface::kNormal; |
| if (face->style_flags & FT_STYLE_FLAG_BOLD) { |
| face_style |= SkTypeface::kBold; |
| } |
| if (face->style_flags & FT_STYLE_FLAG_ITALIC) { |
| face_style |= SkTypeface::kItalic; |
| } |
| |
| style->face_name.set(face->family_name); |
| style->face_style = static_cast<SkTypeface::Style>(face_style); |
| style->face_is_fixed_pitch = FT_IS_FIXED_WIDTH(face); |
| style->is_face_info_generated = true; |
| |
| // Map out this family's characters if they haven't been generated yet. |
| if (!is_character_map_generated_) { |
| FT_UInt glyph_index; |
| |
| int last_page = -1; |
| font_character_map::PageCharacters* page_characters = NULL; |
| |
| SkUnichar code_point = FT_Get_First_Char(face, &glyph_index); |
| while (glyph_index) { |
| int page = font_character_map::GetPage(code_point); |
| if (page != last_page) { |
| page_characters = &character_map_[page]; |
| last_page = page; |
| } |
| page_characters->set( |
| font_character_map::GetPageCharacterIndex(code_point)); |
| |
| code_point = FT_Get_Next_Char(face, code_point, &glyph_index); |
| } |
| |
| is_character_map_generated_ = true; |
| } |
| |
| // release this font. |
| FT_Done_Face(face); |
| |
| // shut down FreeType. |
| FT_Done_FreeType(freetype_lib); |
| return true; |
| } |
| |
| int SkFontStyleSet_Cobalt::GetClosestStyleIndex(const SkFontStyle& pattern) { |
| int closest_index = 0; |
| int max_score = std::numeric_limits<int>::min(); |
| for (int i = 0; i < styles_.count(); ++i) { |
| int score = MatchScore(pattern, styles_[i]->font_style); |
| if (score > max_score) { |
| closest_index = i; |
| max_score = score; |
| } |
| } |
| return closest_index; |
| } |
| |
| void SkFontStyleSet_Cobalt::CreateStreamProviderTypeface( |
| SkFontStyleSetEntry_Cobalt* style_entry, |
| SkFileMemoryChunkStreamProvider* stream_provider /*=NULL*/) { |
| TRACE_EVENT0("cobalt::renderer", |
| "SkFontStyleSet_Cobalt::CreateStreamProviderTypeface()"); |
| |
| if (!stream_provider) { |
| stream_provider = local_typeface_stream_manager_->GetStreamProvider( |
| style_entry->font_file_path.c_str()); |
| } |
| |
| SkAutoTUnref<SkFileMemoryChunkStream> stream(stream_provider->OpenStream()); |
| if (GenerateStyleFaceInfo(style_entry, stream)) { |
| LOG(ERROR) << "Scanned font from file: " << style_entry->face_name.c_str() |
| << "(" << style_entry->face_style << ")"; |
| style_entry->typeface.reset( |
| SkNEW_ARGS(SkTypeface_CobaltStreamProvider, |
| (stream_provider, style_entry->face_index, |
| style_entry->face_style, style_entry->face_is_fixed_pitch, |
| family_name_, style_entry->disable_synthetic_bolding))); |
| } else { |
| LOG(ERROR) << "Failed to scan font: " |
| << style_entry->font_file_path.c_str(); |
| } |
| } |