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/*
* Copyright (C) 2007 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.
* 3. Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE 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 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 UniscribeController_h
#define UniscribeController_h
#include <usp10.h>
#include "Font.h"
#include "GlyphBuffer.h"
#include "Vector.h"
namespace WebCore {
class UniscribeController {
public:
UniscribeController(const Font*, const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0);
// Advance and measure/place 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; }
private:
void resetControlAndState();
void itemizeShapeAndPlace(const UChar*, unsigned length, const SimpleFontData*, GlyphBuffer*);
bool shapeAndPlaceItem(const UChar*, unsigned index, const SimpleFontData*, GlyphBuffer*);
bool shape(const UChar* str, int len, SCRIPT_ITEM item, const SimpleFontData* fontData,
Vector<WORD>& glyphs, Vector<WORD>& clusters,
Vector<SCRIPT_VISATTR>& visualAttributes);
const Font& m_font;
const TextRun& m_run;
HashSet<const SimpleFontData*>* m_fallbackFonts;
SCRIPT_CONTROL m_control;
SCRIPT_STATE m_state;
Vector<SCRIPT_ITEM> m_items;
unsigned m_currentCharacter;
int m_end;
float m_runWidthSoFar;
float m_padding;
float m_padPerSpace;
bool m_computingOffsetPosition;
bool m_includePartialGlyphs;
float m_offsetX;
int m_offsetPosition;
};
}
#endif
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