1 /*
2 * Copyright (C) 2007 Kevin Ollivier. 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 "NotImplemented.h"
34 #include "SimpleFontData.h"
35 #include "TextRun.h"
36
37 #if OS(WINDOWS)
38 #include "UniscribeController.h"
39 typedef WebCore::UniscribeController ComplexTextController;
40 #endif
41
42 #if OS(DARWIN)
43 #include "mac/ComplexTextController.h"
44 #endif
45
46 #include <wx/dcclient.h>
47 #include "fontprops.h"
48 #include "non-kerned-drawing.h"
49
50 namespace WebCore {
51
canReturnFallbackFontsForComplexText()52 bool Font::canReturnFallbackFontsForComplexText()
53 {
54 #if OS(WINDOWS) || OS(DARWIN)
55 return true;
56 #else
57 return false;
58 #endif
59 }
60
canExpandAroundIdeographsInComplexText()61 bool Font::canExpandAroundIdeographsInComplexText()
62 {
63 #if OS(DARWIN)
64 return true;
65 #else
66 return false;
67 #endif
68 }
69
drawGlyphs(GraphicsContext * graphicsContext,const SimpleFontData * font,const GlyphBuffer & glyphBuffer,int from,int numGlyphs,const FloatPoint & point) const70 void Font::drawGlyphs(GraphicsContext* graphicsContext, const SimpleFontData* font, const GlyphBuffer& glyphBuffer,
71 int from, int numGlyphs, const FloatPoint& point) const
72 {
73 // prepare DC
74 Color color = graphicsContext->fillColor();
75
76 // We can't use wx drawing methods on Win/Linux because they automatically kern text
77 // so we've created a function with platform dependent drawing implementations that
78 // will hopefully be folded into wx once the API has solidified.
79 // see platform/wx/wxcode/<platform> for the implementations.
80 drawTextWithSpacing(graphicsContext, font, color, glyphBuffer, from, numGlyphs, point);
81 }
82
selectionRectForComplexText(const TextRun & run,const FloatPoint & point,int h,int from,int to) const83 FloatRect Font::selectionRectForComplexText(const TextRun& run, const FloatPoint& point, int h, int from, int to) const
84 {
85 #if OS(WINDOWS) || OS(DARWIN)
86 ComplexTextController it(this, run);
87 it.advance(from);
88 float beforeWidth = it.runWidthSoFar();
89 it.advance(to);
90 float afterWidth = it.runWidthSoFar();
91
92 // Using roundf() rather than ceilf() for the right edge as a compromise to ensure correct caret positioning
93 if (run.rtl()) {
94 #if OS(WINDOWS)
95 it.advance(run.length());
96 float totalWidth = it.runWidthSoFar();
97 return FloatRect(point.x() + floorf(totalWidth - afterWidth), point.y(), roundf(totalWidth - beforeWidth) - floorf(totalWidth - afterWidth), h);
98 #else
99 float totalWidth = it.totalWidth();
100 return FloatRect(point.x() + floorf(totalWidth - afterWidth), point.y(), roundf(totalWidth - beforeWidth) - floorf(totalWidth - afterWidth), h);
101 #endif
102 }
103
104 return FloatRect(point.x() + floorf(beforeWidth), point.y(), roundf(afterWidth) - floorf(beforeWidth), h);
105 #else
106 notImplemented();
107 return FloatRect();
108 #endif
109 }
110
getGlyphsAndAdvancesForComplexText(const TextRun &,int,int,GlyphBuffer &,ForTextEmphasisOrNot) const111 float Font::getGlyphsAndAdvancesForComplexText(const TextRun& /* run */, int /* from */, int /* to */, GlyphBuffer& /* glyphBuffer */, ForTextEmphasisOrNot /* forTextEmphasis */) const
112 {
113 // FIXME: Implement this by moving most of the drawComplexText() implementation in here. Set up the
114 // ComplexTextController according to forTextEmphasis.
115 notImplemented();
116 return 0;
117 }
118
drawComplexText(GraphicsContext * context,const TextRun & run,const FloatPoint & point,int from,int to) const119 void Font::drawComplexText(GraphicsContext* context, const TextRun& run, const FloatPoint& point, int from, int to) const
120 {
121 #if OS(WINDOWS) || OS(DARWIN)
122 // This glyph buffer holds our glyphs + advances + font data for each glyph.
123 GlyphBuffer glyphBuffer;
124
125 float startX = point.x();
126 ComplexTextController controller(this, run);
127 controller.advance(from);
128 float beforeWidth = controller.runWidthSoFar();
129 controller.advance(to, &glyphBuffer);
130
131 // We couldn't generate any glyphs for the run. Give up.
132 if (glyphBuffer.isEmpty())
133 return;
134
135 float afterWidth = controller.runWidthSoFar();
136
137 if (run.rtl()) {
138 #if OS(WINDOWS)
139 controller.advance(run.length());
140 startX += controller.runWidthSoFar() - afterWidth;
141 #else
142 startX += controller.totalWidth() - afterWidth;
143 for (int i = 0, end = glyphBuffer.size() - 1; i < glyphBuffer.size() / 2; ++i, --end)
144 glyphBuffer.swap(i, end);
145 #endif
146 } else
147 startX += beforeWidth;
148
149 // Draw the glyph buffer now at the starting point returned in startX.
150 FloatPoint startPoint(startX, point.y());
151 drawGlyphBuffer(context, glyphBuffer, startPoint);
152 #else
153 notImplemented();
154 #endif
155 }
156
drawEmphasisMarksForComplexText(GraphicsContext * context,const TextRun & run,const AtomicString & mark,const FloatPoint & point,int from,int to) const157 void Font::drawEmphasisMarksForComplexText(GraphicsContext* context, const TextRun& run, const AtomicString& mark, const FloatPoint& point, int from, int to) const
158 {
159 GlyphBuffer glyphBuffer;
160 float initialAdvance = getGlyphsAndAdvancesForComplexText(run, from, to, glyphBuffer, ForTextEmphasis);
161
162 if (glyphBuffer.isEmpty())
163 return;
164
165 drawEmphasisMarks(context, glyphBuffer, mark, FloatPoint(point.x() + initialAdvance, point.y()));
166 }
167
floatWidthForComplexText(const TextRun & run,HashSet<const SimpleFontData * > * fallbackFonts,GlyphOverflow *) const168 float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow*) const
169 {
170 #if OS(WINDOWS) || OS(DARWIN)
171 ComplexTextController controller(this, run, fallbackFonts);
172 #if OS(WINDOWS)
173 controller.advance(run.length());
174 return controller.runWidthSoFar();
175 #else
176 return controller.totalWidth();
177 #endif
178 #else
179 notImplemented();
180 return 0;
181 #endif
182 }
183
offsetForPositionForComplexText(const TextRun & run,float x,bool includePartialGlyphs) const184 int Font::offsetForPositionForComplexText(const TextRun& run, float x, bool includePartialGlyphs) const
185 {
186 #if OS(WINDOWS) || OS(DARWIN)
187 ComplexTextController controller(this, run);
188 return controller.offsetForPosition(x, includePartialGlyphs);
189 #else
190 notImplemented();
191 return 0;
192 #endif
193 }
194 }
195