1 /*
2  * Copyright (C) 2007, 2008, 2009, 2010 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  * 1. Redistributions of source code must retain the above copyright
8  *    notice, this list of conditions and the following disclaimer.
9  * 2. Redistributions in binary form must reproduce the above copyright
10  *    notice, this list of conditions and the following disclaimer in the
11  *    documentation and/or other materials provided with the distribution.
12  *
13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23  * THE POSSIBILITY OF SUCH DAMAGE.
24  */
25 
26 #ifndef UniscribeController_h
27 #define UniscribeController_h
28 
29 #include <usp10.h>
30 #include "Font.h"
31 #include "GlyphBuffer.h"
32 #include "Vector.h"
33 
34 namespace WebCore {
35 
36 class UniscribeController {
37 public:
38     UniscribeController(const Font*, const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0);
39 
40     // Advance and measure/place up to the specified character.
41     void advance(unsigned to, GlyphBuffer* = 0);
42 
43     // Compute the character offset for a given x coordinate.
44     int offsetForPosition(int x, bool includePartialGlyphs);
45 
46     // Returns the width of everything we've consumed so far.
runWidthSoFar()47     float runWidthSoFar() const { return m_runWidthSoFar; }
48 
minGlyphBoundingBoxX()49     float minGlyphBoundingBoxX() const { return m_minGlyphBoundingBoxX; }
maxGlyphBoundingBoxX()50     float maxGlyphBoundingBoxX() const { return m_maxGlyphBoundingBoxX; }
minGlyphBoundingBoxY()51     float minGlyphBoundingBoxY() const { return m_minGlyphBoundingBoxY; }
maxGlyphBoundingBoxY()52     float maxGlyphBoundingBoxY() const { return m_maxGlyphBoundingBoxY; }
53 
54 private:
55     void resetControlAndState();
56 
57     void itemizeShapeAndPlace(const UChar*, unsigned length, const SimpleFontData*, GlyphBuffer*);
58     bool shapeAndPlaceItem(const UChar*, unsigned index, const SimpleFontData*, GlyphBuffer*);
59     bool shape(const UChar* str, int len, SCRIPT_ITEM item, const SimpleFontData* fontData,
60                Vector<WORD>& glyphs, Vector<WORD>& clusters,
61                Vector<SCRIPT_VISATTR>& visualAttributes);
62 
63     const Font& m_font;
64     const TextRun& m_run;
65     HashSet<const SimpleFontData*>* m_fallbackFonts;
66     FloatPoint m_glyphOrigin;
67     float m_minGlyphBoundingBoxX;
68     float m_maxGlyphBoundingBoxX;
69     float m_minGlyphBoundingBoxY;
70     float m_maxGlyphBoundingBoxY;
71 
72     SCRIPT_CONTROL m_control;
73     SCRIPT_STATE m_state;
74     Vector<SCRIPT_ITEM> m_items;
75 
76     unsigned m_currentCharacter;
77     int m_end;
78 
79     float m_runWidthSoFar;
80     float m_padding;
81     float m_padPerSpace;
82 
83     bool m_computingOffsetPosition;
84     bool m_includePartialGlyphs;
85     float m_offsetX;
86     int m_offsetPosition;
87 };
88 
89 }
90 #endif
91