| /* |
| * Copyright 2019 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkottieShaper_DEFINED |
| #define SkottieShaper_DEFINED |
| |
| #include "include/core/SkPoint.h" |
| #include "include/utils/SkTextUtils.h" |
| |
| #include <vector> |
| |
| class SkFontMgr; |
| class SkTextBlob; |
| |
| namespace skottie { |
| |
| // Helper implementing After Effects text shaping semantics on top of SkShaper. |
| |
| class Shaper final { |
| public: |
| struct Fragment { |
| sk_sp<SkTextBlob> fBlob; |
| SkPoint fPos; |
| |
| // Only valid for kFragmentGlyphs |
| uint32_t fLineIndex; // 0-based index for the line this fragment belongs to. |
| bool fIsWhitespace; // True if the first code point in the corresponding |
| // cluster is whitespace. |
| }; |
| |
| struct Result { |
| std::vector<Fragment> fFragments; |
| |
| SkRect computeVisualBounds() const; |
| }; |
| |
| enum class VAlign : uint8_t { |
| // Align the first line typographical top with the text box top (AE box text). |
| kTop, |
| // Align the first line typographical baseline with the text box top (AE point text). |
| kTopBaseline, |
| |
| // Skottie vertical alignment extensions: these are based on an extent box defined (in Y) as |
| // |
| // ------------------------------------------------------ |
| // MIN(visual_top_extent , typographical_top_extent ) |
| // |
| // ... |
| // |
| // MAX(visual_bottom_extent, typographical_bottom_extent) |
| // ------------------------------------------------------ |
| |
| // extent box top -> text box top |
| kVisualTop, |
| // extent box center -> text box center |
| kVisualCenter, |
| // extent box bottom -> text box bottom |
| kVisualBottom, |
| // Resize the text such that the extent box fits (snuggly) in the text box. |
| kVisualResizeToFit, |
| }; |
| |
| enum Flags : uint32_t { |
| kNone = 0x00, |
| |
| // Split out individual glyphs into separate Fragments |
| // (useful when the caller intends to manipulate glyphs independently). |
| kFragmentGlyphs = 0x01, |
| }; |
| |
| struct TextDesc { |
| const sk_sp<SkTypeface>& fTypeface; |
| SkScalar fTextSize, |
| fLineHeight, |
| fAscent; |
| SkTextUtils::Align fHAlign; |
| VAlign fVAlign; |
| uint32_t fFlags; |
| }; |
| |
| // Performs text layout along an infinite horizontal line, starting at |textPoint|. |
| // Only explicit line breaks (\r) are observed. |
| static Result Shape(const SkString& text, const TextDesc& desc, const SkPoint& textPoint, |
| const sk_sp<SkFontMgr>&); |
| |
| // Performs text layout within |textBox|, injecting line breaks as needed to ensure |
| // horizontal fitting. The result is *not* guaranteed to fit vertically (it may extend |
| // below the box bottom). |
| static Result Shape(const SkString& text, const TextDesc& desc, const SkRect& textBox, |
| const sk_sp<SkFontMgr>&); |
| |
| private: |
| Shaper() = delete; |
| }; |
| |
| } // namespace skottie |
| |
| #endif // SkottieShaper_DEFINED |