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 * 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 #include "config.h"
26 #include "WebCoreTextRenderer.h"
27
28 #include "Font.h"
29 #include "FontDescription.h"
30 #include "GraphicsContext.h"
31 #include "StringTruncator.h"
32 #include "TextRun.h"
33 #include <wtf/unicode/Unicode.h>
34
35 namespace WebCore {
36
37 static bool shouldUseFontSmoothing = true;
38
isOneLeftToRightRun(const TextRun & run)39 static bool isOneLeftToRightRun(const TextRun& run)
40 {
41 for (int i = 0; i < run.length(); i++) {
42 WTF::Unicode::Direction direction = WTF::Unicode::direction(run[i]);
43 if (direction == WTF::Unicode::RightToLeft || direction > WTF::Unicode::OtherNeutral)
44 return false;
45 }
46 return true;
47 }
48
doDrawTextAtPoint(GraphicsContext & context,const String & text,const IntPoint & point,const Font & font,const Color & color,int underlinedIndex)49 static void doDrawTextAtPoint(GraphicsContext& context, const String& text, const IntPoint& point, const Font& font, const Color& color, int underlinedIndex)
50 {
51 TextRun run(text.characters(), text.length());
52
53 context.setFillColor(color, ColorSpaceDeviceRGB);
54 if (isOneLeftToRightRun(run))
55 font.drawText(&context, run, point);
56 else
57 context.drawBidiText(font, run, point);
58
59 if (underlinedIndex >= 0) {
60 ASSERT(underlinedIndex < static_cast<int>(text.length()));
61
62 int beforeWidth;
63 if (underlinedIndex > 0) {
64 TextRun beforeRun(text.characters(), underlinedIndex);
65 beforeWidth = font.width(beforeRun);
66 } else
67 beforeWidth = 0;
68
69 TextRun underlinedRun(text.characters() + underlinedIndex, 1);
70 int underlinedWidth = font.width(underlinedRun);
71
72 IntPoint underlinePoint(point);
73 underlinePoint.move(beforeWidth, 1);
74
75 context.setStrokeColor(color, ColorSpaceDeviceRGB);
76 context.drawLineForText(underlinePoint, underlinedWidth, false);
77 }
78 }
79
WebCoreDrawTextAtPoint(GraphicsContext & context,const String & text,const IntPoint & point,const Font & font,const Color & color,int underlinedIndex)80 void WebCoreDrawTextAtPoint(GraphicsContext& context, const String& text, const IntPoint& point, const Font& font, const Color& color, int underlinedIndex)
81 {
82 context.save();
83
84 doDrawTextAtPoint(context, text, point, font, color, underlinedIndex);
85
86 context.restore();
87 }
88
WebCoreDrawDoubledTextAtPoint(GraphicsContext & context,const String & text,const IntPoint & point,const Font & font,const Color & topColor,const Color & bottomColor,int underlinedIndex)89 void WebCoreDrawDoubledTextAtPoint(GraphicsContext& context, const String& text, const IntPoint& point, const Font& font, const Color& topColor, const Color& bottomColor, int underlinedIndex)
90 {
91 context.save();
92
93 IntPoint textPos = point;
94
95 doDrawTextAtPoint(context, text, textPos, font, bottomColor, underlinedIndex);
96 textPos.move(0, -1);
97 doDrawTextAtPoint(context, text, textPos, font, topColor, underlinedIndex);
98
99 context.restore();
100 }
101
WebCoreTextFloatWidth(const String & text,const Font & font)102 float WebCoreTextFloatWidth(const String& text, const Font& font)
103 {
104 return StringTruncator::width(text, font);
105 }
106
WebCoreSetShouldUseFontSmoothing(bool smooth)107 void WebCoreSetShouldUseFontSmoothing(bool smooth)
108 {
109 shouldUseFontSmoothing = smooth;
110 }
111
WebCoreShouldUseFontSmoothing()112 bool WebCoreShouldUseFontSmoothing()
113 {
114 return shouldUseFontSmoothing;
115 }
116
WebCoreSetAlwaysUsesComplexTextCodePath(bool complex)117 void WebCoreSetAlwaysUsesComplexTextCodePath(bool complex)
118 {
119 Font::setCodePath(complex ? Font::Complex : Font::Auto);
120 }
121
WebCoreAlwaysUsesComplexTextCodePath()122 bool WebCoreAlwaysUsesComplexTextCodePath()
123 {
124 return Font::codePath() == Font::Complex;
125 }
126
127 } // namespace WebCore
128