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