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/*
* Copyright (C) 2007, 2008, 2009, 2010 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 UniscribeController_h
#define UniscribeController_h
#include "FontCascade.h"
#include "GlyphBuffer.h"
#include <usp10.h>
#include <wtf/Vector.h>
namespace WebCore {
class UniscribeController {
public:
UniscribeController(const FontCascade*, const TextRun&, HashSet<const Font*>* 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; }
float minGlyphBoundingBoxX() const { return m_minGlyphBoundingBoxX; }
float maxGlyphBoundingBoxX() const { return m_maxGlyphBoundingBoxX; }
float minGlyphBoundingBoxY() const { return m_minGlyphBoundingBoxY; }
float maxGlyphBoundingBoxY() const { return m_maxGlyphBoundingBoxY; }
private:
void resetControlAndState();
void itemizeShapeAndPlace(const UChar*, unsigned length, const Font*, GlyphBuffer*);
bool shapeAndPlaceItem(const UChar*, unsigned index, const Font*, GlyphBuffer*);
bool shape(const UChar* str, int len, SCRIPT_ITEM, const Font*,
Vector<WORD>& glyphs, Vector<WORD>& clusters,
Vector<SCRIPT_VISATTR>& visualAttributes);
const FontCascade& m_font;
const TextRun& m_run;
HashSet<const Font*>* m_fallbackFonts;
FloatPoint m_glyphOrigin;
float m_minGlyphBoundingBoxX;
float m_maxGlyphBoundingBoxX;
float m_minGlyphBoundingBoxY;
float m_maxGlyphBoundingBoxY;
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