#ifndef HarfBuzzShaper_h
#define HarfBuzzShaper_h
#include "FloatPoint.h"
#include "GlyphBuffer.h"
#include "TextRun.h"
#include "hb.h"
#include <memory>
#include <wtf/Vector.h>
#include <wtf/unicode/CharacterNames.h>
namespace WebCore {
class Font;
class FontCascade;
class HarfBuzzShaper {
public:
enum NormalizeMode {
DoNotNormalizeMirrorChars,
NormalizeMirrorChars
};
HarfBuzzShaper(const FontCascade*, const TextRun&);
virtual ~HarfBuzzShaper();
bool shape(GlyphBuffer* = 0);
FloatPoint adjustStartPoint(const FloatPoint&);
float totalWidth() { return m_totalWidth; }
int offsetForPosition(float targetX);
FloatRect selectionRect(const FloatPoint&, int height, unsigned from, unsigned to);
private:
class HarfBuzzRun {
public:
HarfBuzzRun(const Font*, unsigned startIndex, unsigned numCharacters, TextDirection, hb_script_t);
void applyShapeResult(hb_buffer_t*);
void setGlyphAndPositions(unsigned index, uint16_t glyphId, float advance, float offsetX, float offsetY);
void setWidth(float width) { m_width = width; }
unsigned characterIndexForXPosition(float targetX);
float xPositionForOffset(unsigned offset);
const Font* fontData() { return m_fontData; }
unsigned startIndex() const { return m_startIndex; }
unsigned numCharacters() const { return m_numCharacters; }
unsigned numGlyphs() const { return m_numGlyphs; }
uint16_t* glyphs() { return m_glyphs.data(); }
float* advances() { return m_advances.data(); }
FloatPoint* offsets() { return m_offsets.data(); }
uint16_t* glyphToCharacterIndexes() { return m_glyphToCharacterIndexes.data(); }
float width() { return m_width; }
bool rtl() { return m_direction == RTL; }
hb_script_t script() { return m_script; }
private:
const Font* m_fontData;
unsigned m_startIndex;
unsigned m_numCharacters;
unsigned m_numGlyphs;
TextDirection m_direction;
hb_script_t m_script;
Vector<uint16_t, 256> m_glyphs;
Vector<float, 256> m_advances;
Vector<uint16_t, 256> m_glyphToCharacterIndexes;
Vector<FloatPoint, 256> m_offsets;
float m_width;
};
void setNormalizedBuffer(NormalizeMode = DoNotNormalizeMirrorChars);
bool isWordEnd(unsigned);
int determineWordBreakSpacing();
void setPadding(int);
static bool isCodepointSpace(UChar c) { return c == ' ' || c == noBreakSpace || c == '\n'; }
void setFontFeatures();
bool collectHarfBuzzRuns();
bool shapeHarfBuzzRuns(bool shouldSetDirection);
bool fillGlyphBuffer(GlyphBuffer*);
void fillGlyphBufferFromHarfBuzzRun(GlyphBuffer*, HarfBuzzRun*, FloatPoint& firstOffsetOfNextRun);
void setGlyphPositionsForHarfBuzzRun(HarfBuzzRun*, hb_buffer_t*);
GlyphBufferAdvance createGlyphBufferAdvance(float, float);
const FontCascade* m_font;
std::unique_ptr<UChar[]> m_normalizedBuffer;
unsigned m_normalizedBufferLength;
const TextRun& m_run;
int m_wordSpacingAdjustment; float m_padding; float m_padPerWordBreak; float m_padError; int m_letterSpacing;
Vector<hb_feature_t, 4> m_features;
Vector<std::unique_ptr<HarfBuzzRun>, 16> m_harfBuzzRuns;
FloatPoint m_startOffset;
float m_totalWidth;
};
}
#endif // HarfBuzzShaper_h