| 1 | /* |
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| 2 | * Copyright 2019 Google Inc. |
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| 3 | * |
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| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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| 5 | * you may not use this file except in compliance with the License. |
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| 6 | * You may obtain a copy of the License at |
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| 7 | * |
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| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 9 | * |
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| 10 | * Unless required by applicable law or agreed to in writing, software |
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| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 13 | * See the License for the specific language governing permissions and |
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| 14 | * limitations under the License. |
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| 15 | */ |
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| 16 | |
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| 17 | #ifndef LIB_TXT_SRC_PARAGRAPH_BUILDER_SKIA_H_ |
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| 18 | #define LIB_TXT_SRC_PARAGRAPH_BUILDER_SKIA_H_ |
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| 19 | |
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| 20 | #include "txt/paragraph_builder.h" |
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| 21 | |
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| 22 | #include "flutter/display_list/dl_paint.h" |
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| 23 | #include "third_party/skia/modules/skparagraph/include/ParagraphBuilder.h" |
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| 24 | |
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| 25 | namespace txt { |
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| 26 | |
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| 27 | // Implementation of ParagraphBuilder based on Skia's text layout module. |
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| 28 | class ParagraphBuilderSkia : public ParagraphBuilder { |
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| 29 | public: |
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| 30 | ParagraphBuilderSkia(const ParagraphStyle& style, |
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| 31 | std::shared_ptr<FontCollection> font_collection); |
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| 32 | |
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| 33 | virtual ~ParagraphBuilderSkia(); |
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| 34 | |
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| 35 | virtual void PushStyle(const TextStyle& style) override; |
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| 36 | virtual void Pop() override; |
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| 37 | virtual const TextStyle& PeekStyle() override; |
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| 38 | virtual void AddText(const std::u16string& text) override; |
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| 39 | virtual void AddPlaceholder(PlaceholderRun& span) override; |
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| 40 | virtual std::unique_ptr<Paragraph> Build() override; |
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| 41 | |
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| 42 | private: |
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| 43 | skia::textlayout::ParagraphPainter::PaintID CreatePaintID( |
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| 44 | const flutter::DlPaint& dl_paint); |
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| 45 | skia::textlayout::ParagraphStyle TxtToSkia(const ParagraphStyle& txt); |
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| 46 | skia::textlayout::TextStyle TxtToSkia(const TextStyle& txt); |
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| 47 | |
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| 48 | std::shared_ptr<skia::textlayout::ParagraphBuilder> builder_; |
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| 49 | TextStyle base_style_; |
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| 50 | std::stack<TextStyle> txt_style_stack_; |
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| 51 | std::vector<flutter::DlPaint> dl_paints_; |
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| 52 | }; |
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| 53 | |
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| 54 | } // namespace txt |
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| 55 | |
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| 56 | #endif // LIB_TXT_SRC_PARAGRAPH_BUILDER_SKIA_H_ |
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| 57 | |
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