| /* |
| * Copyright 2018 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "include/core/SkFont.h" |
| #include "include/core/SkFontMetrics.h" |
| #include "include/core/SkFontMgr.h" |
| #include "include/core/SkFontStyle.h" |
| #include "include/core/SkString.h" |
| #include "include/core/SkTypeface.h" |
| #include "include/private/SkTFitsIn.h" |
| #include "modules/skshaper/include/SkShaper.h" |
| |
| #ifdef SK_UNICODE_AVAILABLE |
| #include "modules/skunicode/include/SkUnicode.h" |
| #endif |
| #include "src/core/SkTextBlobPriv.h" |
| #include "src/utils/SkUTF.h" |
| |
| #include <limits.h> |
| #include <string.h> |
| #include <locale> |
| #include <string> |
| #include <utility> |
| |
| std::unique_ptr<SkShaper> SkShaper::Make(sk_sp<SkFontMgr> fontmgr) { |
| #ifdef SK_SHAPER_HARFBUZZ_AVAILABLE |
| std::unique_ptr<SkShaper> shaper = SkShaper::MakeShaperDrivenWrapper(std::move(fontmgr)); |
| if (shaper) { |
| return shaper; |
| } |
| #endif |
| return SkShaper::MakePrimitive(); |
| } |
| |
| void SkShaper::PurgeCaches() { |
| #ifdef SK_SHAPER_HARFBUZZ_AVAILABLE |
| PurgeHarfBuzzCache(); |
| #endif |
| } |
| |
| std::unique_ptr<SkShaper::BiDiRunIterator> |
| SkShaper::MakeBiDiRunIterator(const char* utf8, size_t utf8Bytes, uint8_t bidiLevel) { |
| #ifdef SK_UNICODE_AVAILABLE |
| auto unicode = SkUnicode::Make(); |
| if (!unicode) { |
| return nullptr; |
| } |
| std::unique_ptr<SkShaper::BiDiRunIterator> bidi = |
| SkShaper::MakeSkUnicodeBidiRunIterator(unicode.get(), |
| utf8, |
| utf8Bytes, |
| bidiLevel); |
| if (bidi) { |
| return bidi; |
| } |
| #endif |
| return std::make_unique<SkShaper::TrivialBiDiRunIterator>(bidiLevel, utf8Bytes); |
| } |
| |
| std::unique_ptr<SkShaper::ScriptRunIterator> |
| SkShaper::MakeScriptRunIterator(const char* utf8, size_t utf8Bytes, SkFourByteTag scriptTag) { |
| #if defined(SK_SHAPER_HARFBUZZ_AVAILABLE) && defined(SK_UNICODE_AVAILABLE) |
| auto unicode = SkUnicode::Make(); |
| if (!unicode) { |
| return nullptr; |
| } |
| std::unique_ptr<SkShaper::ScriptRunIterator> script = |
| SkShaper::MakeSkUnicodeHbScriptRunIterator(unicode.get(), utf8, utf8Bytes); |
| if (script) { |
| return script; |
| } |
| #endif |
| return std::make_unique<SkShaper::TrivialScriptRunIterator>(scriptTag, utf8Bytes); |
| } |
| |
| SkShaper::SkShaper() {} |
| SkShaper::~SkShaper() {} |
| |
| /** Replaces invalid utf-8 sequences with REPLACEMENT CHARACTER U+FFFD. */ |
| static inline SkUnichar utf8_next(const char** ptr, const char* end) { |
| SkUnichar val = SkUTF::NextUTF8(ptr, end); |
| return val < 0 ? 0xFFFD : val; |
| } |
| |
| class FontMgrRunIterator final : public SkShaper::FontRunIterator { |
| public: |
| FontMgrRunIterator(const char* utf8, size_t utf8Bytes, |
| const SkFont& font, sk_sp<SkFontMgr> fallbackMgr, |
| const char* requestName, SkFontStyle requestStyle, |
| const SkShaper::LanguageRunIterator* lang) |
| : fCurrent(utf8), fBegin(utf8), fEnd(fCurrent + utf8Bytes) |
| , fFallbackMgr(std::move(fallbackMgr)) |
| , fFont(font) |
| , fFallbackFont(fFont) |
| , fCurrentFont(nullptr) |
| , fRequestName(requestName) |
| , fRequestStyle(requestStyle) |
| , fLanguage(lang) |
| { |
| fFont.setTypeface(font.refTypefaceOrDefault()); |
| fFallbackFont.setTypeface(nullptr); |
| } |
| FontMgrRunIterator(const char* utf8, size_t utf8Bytes, |
| const SkFont& font, sk_sp<SkFontMgr> fallbackMgr) |
| : FontMgrRunIterator(utf8, utf8Bytes, font, std::move(fallbackMgr), |
| nullptr, font.refTypefaceOrDefault()->fontStyle(), nullptr) |
| {} |
| |
| void consume() override { |
| SkASSERT(fCurrent < fEnd); |
| SkASSERT(!fLanguage || this->endOfCurrentRun() <= fLanguage->endOfCurrentRun()); |
| SkUnichar u = utf8_next(&fCurrent, fEnd); |
| // If the starting typeface can handle this character, use it. |
| if (fFont.unicharToGlyph(u)) { |
| fCurrentFont = &fFont; |
| // If the current fallback can handle this character, use it. |
| } else if (fFallbackFont.getTypeface() && fFallbackFont.unicharToGlyph(u)) { |
| fCurrentFont = &fFallbackFont; |
| // If not, try to find a fallback typeface |
| } else { |
| const char* language = fLanguage ? fLanguage->currentLanguage() : nullptr; |
| int languageCount = fLanguage ? 1 : 0; |
| sk_sp<SkTypeface> candidate(fFallbackMgr->matchFamilyStyleCharacter( |
| fRequestName, fRequestStyle, &language, languageCount, u)); |
| if (candidate) { |
| fFallbackFont.setTypeface(std::move(candidate)); |
| fCurrentFont = &fFallbackFont; |
| } else { |
| fCurrentFont = &fFont; |
| } |
| } |
| |
| while (fCurrent < fEnd) { |
| const char* prev = fCurrent; |
| u = utf8_next(&fCurrent, fEnd); |
| |
| // End run if not using initial typeface and initial typeface has this character. |
| if (fCurrentFont->getTypeface() != fFont.getTypeface() && fFont.unicharToGlyph(u)) { |
| fCurrent = prev; |
| return; |
| } |
| |
| // End run if current typeface does not have this character and some other font does. |
| if (!fCurrentFont->unicharToGlyph(u)) { |
| const char* language = fLanguage ? fLanguage->currentLanguage() : nullptr; |
| int languageCount = fLanguage ? 1 : 0; |
| sk_sp<SkTypeface> candidate(fFallbackMgr->matchFamilyStyleCharacter( |
| fRequestName, fRequestStyle, &language, languageCount, u)); |
| if (candidate) { |
| fCurrent = prev; |
| return; |
| } |
| } |
| } |
| } |
| size_t endOfCurrentRun() const override { |
| return fCurrent - fBegin; |
| } |
| bool atEnd() const override { |
| return fCurrent == fEnd; |
| } |
| |
| const SkFont& currentFont() const override { |
| return *fCurrentFont; |
| } |
| |
| private: |
| char const * fCurrent; |
| char const * const fBegin; |
| char const * const fEnd; |
| sk_sp<SkFontMgr> const fFallbackMgr; |
| SkFont fFont; |
| SkFont fFallbackFont; |
| SkFont* fCurrentFont; |
| char const * const fRequestName; |
| SkFontStyle const fRequestStyle; |
| SkShaper::LanguageRunIterator const * const fLanguage; |
| }; |
| |
| std::unique_ptr<SkShaper::FontRunIterator> |
| SkShaper::MakeFontMgrRunIterator(const char* utf8, size_t utf8Bytes, |
| const SkFont& font, sk_sp<SkFontMgr> fallback) |
| { |
| return std::make_unique<FontMgrRunIterator>(utf8, utf8Bytes, font, std::move(fallback)); |
| } |
| |
| std::unique_ptr<SkShaper::FontRunIterator> |
| SkShaper::MakeFontMgrRunIterator(const char* utf8, size_t utf8Bytes, const SkFont& font, |
| sk_sp<SkFontMgr> fallback, |
| const char* requestName, SkFontStyle requestStyle, |
| const SkShaper::LanguageRunIterator* language) |
| { |
| return std::make_unique<FontMgrRunIterator>(utf8, utf8Bytes, font, std::move(fallback), |
| requestName, requestStyle, language); |
| } |
| |
| std::unique_ptr<SkShaper::LanguageRunIterator> |
| SkShaper::MakeStdLanguageRunIterator(const char* utf8, size_t utf8Bytes) { |
| return std::make_unique<TrivialLanguageRunIterator>(std::locale().name().c_str(), utf8Bytes); |
| } |
| |
| void SkTextBlobBuilderRunHandler::beginLine() { |
| fCurrentPosition = fOffset; |
| fMaxRunAscent = 0; |
| fMaxRunDescent = 0; |
| fMaxRunLeading = 0; |
| } |
| void SkTextBlobBuilderRunHandler::runInfo(const RunInfo& info) { |
| SkFontMetrics metrics; |
| info.fFont.getMetrics(&metrics); |
| fMaxRunAscent = std::min(fMaxRunAscent, metrics.fAscent); |
| fMaxRunDescent = std::max(fMaxRunDescent, metrics.fDescent); |
| fMaxRunLeading = std::max(fMaxRunLeading, metrics.fLeading); |
| } |
| |
| void SkTextBlobBuilderRunHandler::commitRunInfo() { |
| fCurrentPosition.fY -= fMaxRunAscent; |
| } |
| |
| SkShaper::RunHandler::Buffer SkTextBlobBuilderRunHandler::runBuffer(const RunInfo& info) { |
| int glyphCount = SkTFitsIn<int>(info.glyphCount) ? info.glyphCount : INT_MAX; |
| int utf8RangeSize = SkTFitsIn<int>(info.utf8Range.size()) ? info.utf8Range.size() : INT_MAX; |
| |
| const auto& runBuffer = fBuilder.allocRunTextPos(info.fFont, glyphCount, utf8RangeSize); |
| if (runBuffer.utf8text && fUtf8Text) { |
| memcpy(runBuffer.utf8text, fUtf8Text + info.utf8Range.begin(), utf8RangeSize); |
| } |
| fClusters = runBuffer.clusters; |
| fGlyphCount = glyphCount; |
| fClusterOffset = info.utf8Range.begin(); |
| |
| return { runBuffer.glyphs, |
| runBuffer.points(), |
| nullptr, |
| runBuffer.clusters, |
| fCurrentPosition }; |
| } |
| |
| void SkTextBlobBuilderRunHandler::commitRunBuffer(const RunInfo& info) { |
| SkASSERT(0 <= fClusterOffset); |
| for (int i = 0; i < fGlyphCount; ++i) { |
| SkASSERT(fClusters[i] >= (unsigned)fClusterOffset); |
| fClusters[i] -= fClusterOffset; |
| } |
| fCurrentPosition += info.fAdvance; |
| } |
| void SkTextBlobBuilderRunHandler::commitLine() { |
| fOffset += { 0, fMaxRunDescent + fMaxRunLeading - fMaxRunAscent }; |
| } |
| |
| sk_sp<SkTextBlob> SkTextBlobBuilderRunHandler::makeBlob() { |
| return fBuilder.make(); |
| } |