| /* |
| * Copyright 2018 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| #ifndef SkClusterator_DEFINED |
| #define SkClusterator_DEFINED |
| |
| #include <cstdint> |
| #include <vector> |
| |
| namespace sktext { |
| class GlyphRun; |
| } |
| |
| /** Given the m-to-n glyph-to-character mapping data (as returned by |
| harfbuzz), iterate over the clusters. */ |
| class SkClusterator { |
| public: |
| SkClusterator(const sktext::GlyphRun& run); |
| uint32_t glyphCount() const { return fGlyphCount; } |
| bool reversedChars() const { return fReversedChars; } |
| struct Cluster { |
| const char* fUtf8Text; |
| uint32_t fTextByteLength; |
| uint32_t fGlyphIndex; |
| uint32_t fGlyphCount; |
| explicit operator bool() const { return fGlyphCount != 0; } |
| bool operator==(const SkClusterator::Cluster& o) { |
| return fUtf8Text == o.fUtf8Text |
| && fTextByteLength == o.fTextByteLength |
| && fGlyphIndex == o.fGlyphIndex |
| && fGlyphCount == o.fGlyphCount; |
| } |
| }; |
| Cluster next(); |
| |
| private: |
| uint32_t const * const fClusters; |
| char const * const fUtf8Text; |
| uint32_t const fGlyphCount; |
| uint32_t const fTextByteLength; |
| bool const fReversedChars; |
| uint32_t fCurrentGlyphIndex = 0; |
| }; |
| #endif // SkClusterator_DEFINED |