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1 /* | |
2 * Copyright (C) 2006, 2007, 2008 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 COMPUTER, INC. ``AS IS'' AND ANY | |
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR | |
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
24 */ | |
25 | |
26 #include "config.h" | |
27 #include "Font.h" | |
28 | |
29 #include "FontFallbackList.h" | |
30 #include "GlyphBuffer.h" | |
31 #include "GraphicsContext.h" | |
32 #include "IntRect.h" | |
33 #include "Logging.h" | |
34 #include "SimpleFontData.h" | |
35 #include "TextRun.h" | |
36 #include "UniscribeController.h" | |
37 #include <wtf/MathExtras.h> | |
38 | |
39 using namespace std; | |
40 | |
41 namespace WebCore { | |
42 | |
43 bool Font::canReturnFallbackFontsForComplexText() | |
44 { | |
45 return true; | |
46 } | |
47 | |
48 bool Font::canExpandAroundIdeographsInComplexText() | |
49 { | |
50 return false; | |
51 } | |
52 | |
53 FloatRect Font::selectionRectForComplexText(const TextRun& run, const FloatPoint
& point, int h, | |
54 int from, int to) const | |
55 { | |
56 UniscribeController it(this, run); | |
57 it.advance(from); | |
58 float beforeWidth = it.runWidthSoFar(); | |
59 it.advance(to); | |
60 float afterWidth = it.runWidthSoFar(); | |
61 | |
62 // Using roundf() rather than ceilf() for the right edge as a compromise to
ensure correct caret positioning | |
63 if (run.rtl()) { | |
64 it.advance(run.length()); | |
65 float totalWidth = it.runWidthSoFar(); | |
66 return FloatRect(point.x() + floorf(totalWidth - afterWidth), point.y(),
roundf(totalWidth - beforeWidth) - floorf(totalWidth - afterWidth), h); | |
67 } | |
68 | |
69 return FloatRect(point.x() + floorf(beforeWidth), point.y(), roundf(afterWid
th) - floorf(beforeWidth), h); | |
70 } | |
71 | |
72 float Font::getGlyphsAndAdvancesForComplexText(const TextRun& run, int from, int
to, GlyphBuffer& glyphBuffer, ForTextEmphasisOrNot forTextEmphasis) const | |
73 { | |
74 if (forTextEmphasis) { | |
75 // FIXME: Add forTextEmphasis paremeter to UniscribeController and use i
t. | |
76 LOG_ERROR("Not implemented for text emphasis."); | |
77 return 0; | |
78 } | |
79 | |
80 UniscribeController controller(this, run); | |
81 controller.advance(from); | |
82 float beforeWidth = controller.runWidthSoFar(); | |
83 controller.advance(to, &glyphBuffer); | |
84 | |
85 if (glyphBuffer.isEmpty()) | |
86 return 0; | |
87 | |
88 float afterWidth = controller.runWidthSoFar(); | |
89 | |
90 if (run.rtl()) { | |
91 controller.advance(run.length()); | |
92 return controller.runWidthSoFar() - afterWidth; | |
93 } | |
94 return beforeWidth; | |
95 } | |
96 | |
97 void Font::drawComplexText(GraphicsContext* context, const TextRun& run, const F
loatPoint& point, | |
98 int from, int to) const | |
99 { | |
100 // This glyph buffer holds our glyphs + advances + font data for each glyph. | |
101 GlyphBuffer glyphBuffer; | |
102 | |
103 float startX = point.x() + getGlyphsAndAdvancesForComplexText(run, from, to,
glyphBuffer); | |
104 | |
105 // We couldn't generate any glyphs for the run. Give up. | |
106 if (glyphBuffer.isEmpty()) | |
107 return; | |
108 | |
109 // Draw the glyph buffer now at the starting point returned in startX. | |
110 FloatPoint startPoint(startX, point.y()); | |
111 drawGlyphBuffer(context, run, glyphBuffer, startPoint); | |
112 } | |
113 | |
114 void Font::drawEmphasisMarksForComplexText(GraphicsContext* context, const TextR
un& run, const AtomicString& mark, const FloatPoint& point, int from, int to) co
nst | |
115 { | |
116 GlyphBuffer glyphBuffer; | |
117 float initialAdvance = getGlyphsAndAdvancesForComplexText(run, from, to, gly
phBuffer, ForTextEmphasis); | |
118 | |
119 if (glyphBuffer.isEmpty()) | |
120 return; | |
121 | |
122 drawEmphasisMarks(context, run, glyphBuffer, mark, FloatPoint(point.x() + in
itialAdvance, point.y())); | |
123 } | |
124 | |
125 float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFon
tData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const | |
126 { | |
127 UniscribeController controller(this, run, fallbackFonts); | |
128 controller.advance(run.length()); | |
129 if (glyphOverflow) { | |
130 glyphOverflow->top = max<int>(glyphOverflow->top, ceilf(-controller.minG
lyphBoundingBoxY()) - (glyphOverflow->computeBounds ? 0 : fontMetrics().ascent()
)); | |
131 glyphOverflow->bottom = max<int>(glyphOverflow->bottom, ceilf(controller
.maxGlyphBoundingBoxY()) - (glyphOverflow->computeBounds ? 0 : fontMetrics().de
scent())); | |
132 glyphOverflow->left = max<int>(0, ceilf(-controller.minGlyphBoundingBoxX
())); | |
133 glyphOverflow->right = max<int>(0, ceilf(controller.maxGlyphBoundingBoxX
() - controller.runWidthSoFar())); | |
134 } | |
135 return controller.runWidthSoFar(); | |
136 } | |
137 | |
138 int Font::offsetForPositionForComplexText(const TextRun& run, float xFloat, bool
includePartialGlyphs) const | |
139 { | |
140 // FIXME: This truncation is not a problem for HTML, but only affects SVG, w
hich passes floating-point numbers | |
141 // to Font::offsetForPosition(). Bug http://webkit.org/b/40673 tracks fixing
this problem. | |
142 int x = static_cast<int>(xFloat); | |
143 | |
144 UniscribeController controller(this, run); | |
145 return controller.offsetForPosition(x, includePartialGlyphs); | |
146 } | |
147 | |
148 } | |
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