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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 "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();
// setPadding sets a number of pixels to be distributed across the TextRun.
// WebKit uses this to justify text.
void setPadding(int);
// In complex text word-spacing affects each line-break, space (U+0020) and non-breaking space (U+00A0).
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; // Delta adjustment (pixels) for each word break.
float m_padding; // Pixels to be distributed over the line at word breaks.
float m_padPerWordBreak; // Pixels to be added to each word break.
float m_padError; // m_padPerWordBreak might have a fractional component. Since we only add a whole number of padding pixels at each word break we accumulate error. This is the number of pixels that we are behind so far.
int m_letterSpacing; // Pixels to be added after each glyph.
Vector<hb_feature_t, 4> m_features;
Vector<std::unique_ptr<HarfBuzzRun>, 16> m_harfBuzzRuns;
FloatPoint m_startOffset;
float m_totalWidth;
};
} // namespace WebCore
#endif // HarfBuzzShaper_h
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