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/*
* 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
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