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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 <vector>
#include "SkTypes.h"
#include "SkPaint.h"
/** Given the m-to-n glyph-to-character mapping data (as returned by
harfbuzz), iterate over the clusters. */
class SkClusterator {
public:
SkClusterator(const void* sourceText,
size_t sourceByteCount,
const SkPaint& paint,
const uint32_t* clusters,
uint32_t utf8TextByteLength,
const char* utf8Text);
const SkGlyphID* glyphs() const { return fGlyphs; }
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:
std::vector<SkGlyphID> fGlyphStorage;
std::vector<char> fUtf8textStorage;
std::vector<uint32_t> fClusterStorage;
const SkGlyphID* fGlyphs;
const uint32_t* fClusters;
const char* fUtf8Text;
uint32_t fGlyphCount;
uint32_t fTextByteLength;
uint32_t fCurrentGlyphIndex = 0;
bool fReversedChars = false;
};
#endif // SkClusterator_DEFINED
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