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/*
* Copyright (C) 2007, 2008, 2009 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 ComplexTextController_h
#define ComplexTextController_h
#include "GlyphBuffer.h"
#include <wtf/HashSet.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/RetainPtr.h>
#include <wtf/Vector.h>
#include <wtf/unicode/Unicode.h>
namespace WebCore {
class Font;
class SimpleFontData;
class TextRun;
class ComplexTextController {
public:
ComplexTextController(const Font*, const TextRun&, bool mayUseNaturalWritingDirection = false, HashSet<const SimpleFontData*>* fallbackFonts = 0);
// Advance and emit glyphs up to the specified character.
void advance(unsigned to, GlyphBuffer* = 0);
// Compute the character offset for a given x coordinate.
int offsetForPosition(int x, bool includePartialGlyphs);
// Returns the width of everything we've consumed so far.
float runWidthSoFar() const { return m_runWidthSoFar; }
float totalWidth() const { return m_totalWidth; }
// Extra width to the left of the leftmost glyph.
float finalRoundingWidth() const { return m_finalRoundingWidth; }
private:
class ComplexTextRun : public RefCounted<ComplexTextRun> {
public:
#if USE(CORE_TEXT)
static PassRefPtr<ComplexTextRun> create(CTRunRef ctRun, const SimpleFontData* fontData, const UChar* characters, unsigned stringLocation, size_t stringLength)
{
return adoptRef(new ComplexTextRun(ctRun, fontData, characters, stringLocation, stringLength));
}
#elif USE(ATSUI)
static PassRefPtr<ComplexTextRun> create(ATSUTextLayout atsuTextLayout, const SimpleFontData* fontData, const UChar* characters, unsigned stringLocation, size_t stringLength, bool ltr, bool directionalOverride)
{
return adoptRef(new ComplexTextRun(atsuTextLayout, fontData, characters, stringLocation, stringLength, ltr, directionalOverride));
}
#endif
static PassRefPtr<ComplexTextRun> create(const SimpleFontData* fontData, const UChar* characters, unsigned stringLocation, size_t stringLength, bool ltr)
{
return adoptRef(new ComplexTextRun(fontData, characters, stringLocation, stringLength, ltr));
}
unsigned glyphCount() const { return m_glyphCount; }
const SimpleFontData* fontData() const { return m_fontData; }
const UChar* characters() const { return m_characters; }
unsigned stringLocation() const { return m_stringLocation; }
size_t stringLength() const { return m_stringLength; }
CFIndex indexAt(size_t i) const { return m_indices[i]; }
const CGGlyph* glyphs() const { return m_glyphs; }
const CGSize* advances() const { return m_advances; }
private:
#if USE(CORE_TEXT)
ComplexTextRun(CTRunRef, const SimpleFontData*, const UChar* characters, unsigned stringLocation, size_t stringLength);
#elif USE(ATSUI)
ComplexTextRun(ATSUTextLayout, const SimpleFontData*, const UChar* characters, unsigned stringLocation, size_t stringLength, bool ltr, bool directionalOverride);
#endif
ComplexTextRun(const SimpleFontData*, const UChar* characters, unsigned stringLocation, size_t stringLength, bool ltr);
#if USE(ATSUI)
#ifdef BUILDING_ON_TIGER
typedef UInt32 URefCon;
#endif
static OSStatus overrideLayoutOperation(ATSULayoutOperationSelector, ATSULineRef, URefCon, void*, ATSULayoutOperationCallbackStatus*);
#endif
#if USE(CORE_TEXT)
RetainPtr<CTRunRef> m_CTRun;
#endif
unsigned m_glyphCount;
const SimpleFontData* m_fontData;
const UChar* m_characters;
unsigned m_stringLocation;
size_t m_stringLength;
#if USE(CORE_TEXT)
RetainPtr<CFMutableDataRef> m_indicesData;
const CFIndex* m_indices;
#elif USE(ATSUI)
Vector<CFIndex, 64> m_indices;
#endif
Vector<CGGlyph, 64> m_glyphsVector;
const CGGlyph* m_glyphs;
Vector<CGSize, 64> m_advancesVector;
const CGSize* m_advances;
#if USE(ATSUI)
bool m_ltr;
bool m_directionalOverride;
#endif
};
void collectComplexTextRuns();
void collectComplexTextRunsForCharacters(const UChar*, unsigned length, unsigned stringLocation, const SimpleFontData*);
void adjustGlyphsAndAdvances();
const Font& m_font;
const TextRun& m_run;
bool m_mayUseNaturalWritingDirection;
Vector<UChar, 256> m_smallCapsBuffer;
Vector<RefPtr<ComplexTextRun>, 16> m_complexTextRuns;
Vector<CGSize, 256> m_adjustedAdvances;
Vector<CGGlyph, 256> m_adjustedGlyphs;
unsigned m_currentCharacter;
int m_end;
CGFloat m_totalWidth;
float m_runWidthSoFar;
unsigned m_numGlyphsSoFar;
size_t m_currentRun;
unsigned m_glyphInCurrentRun;
unsigned m_characterInCurrentGlyph;
float m_finalRoundingWidth;
float m_padding;
float m_padPerSpace;
HashSet<const SimpleFontData*>* m_fallbackFonts;
unsigned m_lastRoundingGlyph;
};
} // namespace WebCore
#endif // ComplexTextController_h
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