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      1 /*
      2  * Copyright (C) 2007 Apple Inc.  All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
     14  *     its contributors may be used to endorse or promote products derived
     15  *     from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #ifndef UniscribeController_h
     30 #define UniscribeController_h
     31 
     32 #include <usp10.h>
     33 #include "Font.h"
     34 #include "GlyphBuffer.h"
     35 #include "Vector.h"
     36 
     37 namespace WebCore {
     38 
     39 class UniscribeController {
     40 public:
     41     UniscribeController(const Font*, const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0);
     42 
     43     // Advance and measure/place up to the specified character.
     44     void advance(unsigned to, GlyphBuffer* = 0);
     45 
     46     // Compute the character offset for a given x coordinate.
     47     int offsetForPosition(int x, bool includePartialGlyphs);
     48 
     49     // Returns the width of everything we've consumed so far.
     50     float runWidthSoFar() const { return m_runWidthSoFar; }
     51 
     52 private:
     53     void resetControlAndState();
     54 
     55     void itemizeShapeAndPlace(const UChar*, unsigned length, const SimpleFontData*, GlyphBuffer*);
     56     bool shapeAndPlaceItem(const UChar*, unsigned index, const SimpleFontData*, GlyphBuffer*);
     57     bool shape(const UChar* str, int len, SCRIPT_ITEM item, const SimpleFontData* fontData,
     58                Vector<WORD>& glyphs, Vector<WORD>& clusters,
     59                Vector<SCRIPT_VISATTR>& visualAttributes);
     60 
     61     const Font& m_font;
     62     const TextRun& m_run;
     63     HashSet<const SimpleFontData*>* m_fallbackFonts;
     64 
     65     SCRIPT_CONTROL m_control;
     66     SCRIPT_STATE m_state;
     67     Vector<SCRIPT_ITEM> m_items;
     68 
     69     unsigned m_currentCharacter;
     70     int m_end;
     71 
     72     float m_runWidthSoFar;
     73     float m_padding;
     74     float m_padPerSpace;
     75 
     76     bool m_computingOffsetPosition;
     77     bool m_includePartialGlyphs;
     78     float m_offsetX;
     79     int m_offsetPosition;
     80 };
     81 
     82 }
     83 #endif
     84