/*

 * 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 "Font.h"

#include "GlyphBuffer.h"

#include "Vector.h"

#include <usp10.h>

namespace WebCore {

class UniscribeController {

public:

    UniscribeController(const Font*, const TextRun&, const TextStyle&);

    // 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, bool smallCaps, GlyphBuffer* glyphBuffer);

    bool shapeAndPlaceItem(const UChar*, unsigned index, bool smallCaps, GlyphBuffer*);

    bool shape(const UChar* str, int len, SCRIPT_ITEM item, const FontData* fontData,

               Vector<WORD>& glyphs, Vector<WORD>& clusters,

               Vector<SCRIPT_VISATTR>& visualAttributes);

    const Font& m_font;

    const TextRun& m_run;

    const TextStyle& m_style;

    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