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/*
* Copyright (C) 2012 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef HarfBuzzShaper_h
#define HarfBuzzShaper_h
#include "FloatPoint.h"
#include "GlyphBuffer.h"
#include "HarfBuzzShaperBase.h"
#include "TextRun.h"
#include "hb.h"
#include <wtf/HashSet.h>
#include <wtf/OwnPtr.h>
#include <wtf/PassOwnPtr.h>
#include <wtf/Vector.h>
namespace WebCore {
class Font;
class SimpleFontData;
class HarfBuzzShaper : public HarfBuzzShaperBase {
public:
HarfBuzzShaper(const Font*, const TextRun&);
virtual ~HarfBuzzShaper();
void setDrawRange(int from, int to);
bool shape(GlyphBuffer* = 0);
FloatPoint adjustStartPoint(const FloatPoint&);
float totalWidth() { return m_totalWidth; }
int offsetForPosition(float targetX);
FloatRect selectionRect(const FloatPoint&, int height, int from, int to);
private:
class HarfBuzzRun {
public:
static PassOwnPtr<HarfBuzzRun> create(const SimpleFontData* fontData, unsigned startIndex, unsigned numCharacters, TextDirection direction, hb_script_t script)
{
return adoptPtr(new HarfBuzzRun(fontData, startIndex, numCharacters, direction, script));
}
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; }
int characterIndexForXPosition(float targetX);
float xPositionForOffset(unsigned offset);
const SimpleFontData* 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[0]; }
float* advances() { return &m_advances[0]; }
FloatPoint* offsets() { return &m_offsets[0]; }
uint16_t* glyphToCharacterIndexes() { return &m_glyphToCharacterIndexes[0]; }
float width() { return m_width; }
bool rtl() { return m_direction == RTL; }
hb_script_t script() { return m_script; }
private:
HarfBuzzRun(const SimpleFontData*, unsigned startIndex, unsigned numCharacters, TextDirection, hb_script_t);
const SimpleFontData* m_fontData;
unsigned m_startIndex;
size_t 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 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);
Vector<hb_feature_t, 4> m_features;
Vector<OwnPtr<HarfBuzzRun>, 16> m_harfbuzzRuns;
FloatPoint m_startOffset;
int m_fromIndex;
int m_toIndex;
float m_totalWidth;
};
} // namespace WebCore
#endif // HarfBuzzShaper_h
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