| // Copyright 2019 Google LLC. |
| #ifndef ParagraphBuilderImpl_DEFINED |
| #define ParagraphBuilderImpl_DEFINED |
| |
| #include <memory> |
| #include <stack> |
| #include <string> |
| #include <tuple> |
| #include "include/private/base/SkOnce.h" |
| #include "include/private/base/SkTArray.h" |
| #include "modules/skparagraph/include/FontCollection.h" |
| #include "modules/skparagraph/include/Paragraph.h" |
| #include "modules/skparagraph/include/ParagraphBuilder.h" |
| #include "modules/skparagraph/include/ParagraphStyle.h" |
| #include "modules/skparagraph/include/TextStyle.h" |
| #include "modules/skunicode/include/SkUnicode.h" |
| |
| namespace skia { |
| namespace textlayout { |
| |
| class ParagraphBuilderImpl : public ParagraphBuilder { |
| public: |
| ParagraphBuilderImpl(const ParagraphStyle& style, |
| sk_sp<FontCollection> fontCollection, |
| std::unique_ptr<SkUnicode> unicode); |
| |
| // Just until we fix all the code; calls icu::make inside |
| ParagraphBuilderImpl(const ParagraphStyle& style, sk_sp<FontCollection> fontCollection); |
| |
| ~ParagraphBuilderImpl() override; |
| |
| // Push a style to the stack. The corresponding text added with AddText will |
| // use the top-most style. |
| void pushStyle(const TextStyle& style) override; |
| |
| // Remove a style from the stack. Useful to apply different styles to chunks |
| // of text such as bolding. |
| // Example: |
| // builder.PushStyle(normal_style); |
| // builder.AddText("Hello this is normal. "); |
| // |
| // builder.PushStyle(bold_style); |
| // builder.AddText("And this is BOLD. "); |
| // |
| // builder.Pop(); |
| // builder.AddText(" Back to normal again."); |
| void pop() override; |
| |
| TextStyle peekStyle() override; |
| |
| // Adds text to the builder. Forms the proper runs to use the upper-most style |
| // on the style_stack. |
| void addText(const std::u16string& text) override; |
| |
| // Adds text to the builder, using the top-most style on on the style_stack. |
| void addText(const char* text) override; // Don't use this one - going away soon |
| void addText(const char* text, size_t len) override; |
| |
| void addPlaceholder(const PlaceholderStyle& placeholderStyle) override; |
| |
| // Constructs a SkParagraph object that can be used to layout and paint the text to a SkCanvas. |
| std::unique_ptr<Paragraph> Build() override; |
| |
| // Support for "Client" unicode |
| SkSpan<char> getText(); |
| const ParagraphStyle& getParagraphStyle() const; |
| |
| void setWordsUtf8(std::vector<SkUnicode::Position> wordsUtf8); |
| void setWordsUtf16(std::vector<SkUnicode::Position> wordsUtf16); |
| |
| void setGraphemeBreaksUtf8(std::vector<SkUnicode::Position> graphemesUtf8); |
| void setGraphemeBreaksUtf16(std::vector<SkUnicode::Position> graphemesUtf16); |
| |
| void setLineBreaksUtf8(std::vector<SkUnicode::LineBreakBefore> lineBreaksUtf8); |
| void setLineBreaksUtf16(std::vector<SkUnicode::LineBreakBefore> lineBreaksUtf16); |
| |
| void SetUnicode(std::unique_ptr<SkUnicode> unicode) { |
| fUnicode = std::move(unicode); |
| } |
| // Support for Flutter optimization |
| void Reset() override; |
| |
| static std::unique_ptr<ParagraphBuilder> make(const ParagraphStyle& style, |
| sk_sp<FontCollection> fontCollection, |
| std::unique_ptr<SkUnicode> unicode); |
| |
| // Just until we fix all the code; calls icu::make inside |
| static std::unique_ptr<ParagraphBuilder> make(const ParagraphStyle& style, |
| sk_sp<FontCollection> fontCollection); |
| |
| static bool RequiresClientICU(); |
| protected: |
| void startStyledBlock(); |
| void endRunIfNeeded(); |
| const TextStyle& internalPeekStyle(); |
| void addPlaceholder(const PlaceholderStyle& placeholderStyle, bool lastOne); |
| void finalize(); |
| |
| SkString fUtf8; |
| SkSTArray<4, TextStyle, true> fTextStyles; |
| SkSTArray<4, Block, true> fStyledBlocks; |
| SkSTArray<4, Placeholder, true> fPlaceholders; |
| sk_sp<FontCollection> fFontCollection; |
| ParagraphStyle fParagraphStyle; |
| |
| std::shared_ptr<SkUnicode> fUnicode; |
| private: |
| SkOnce fillUTF16MappingOnce; |
| void ensureUTF16Mapping(); |
| SkTArray<TextIndex, true> fUTF8IndexForUTF16Index; |
| SkTArray<TextIndex, true> fUTF16IndexForUTF8Index; |
| #if !defined(SK_UNICODE_ICU_IMPLEMENTATION) && defined(SK_UNICODE_CLIENT_IMPLEMENTATION) |
| bool fTextIsFinalized; |
| bool fUsingClientInfo; |
| std::vector<SkUnicode::Position> fWordsUtf16; |
| std::vector<SkUnicode::Position> fGraphemeBreaksUtf8; |
| std::vector<SkUnicode::LineBreakBefore> fLineBreaksUtf8; |
| #endif |
| }; |
| } // namespace textlayout |
| } // namespace skia |
| |
| #endif // ParagraphBuilderImpl_DEFINED |