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
26 #include "config.h"
27 #include "WebKitGraphics.h"
28
29 #include "WebKit.h"
30 #include "WebKitDLL.h"
31
32 #include "WebPreferences.h"
33
34 #include <WebCore/Font.h>
35 #include <WebCore/FontDescription.h>
36 #include <WebCore/FontSelector.h>
37 #include <WebCore/GraphicsContext.h>
38 #include <WebCore/PlatformString.h>
39 #include <WebCore/StringTruncator.h>
40 #include <WebCore/WebCoreTextRenderer.h>
41 #include <wtf/unicode/CharacterNames.h>
42
43 #include <CoreGraphics/CoreGraphics.h>
44
45 #include <WebKitSystemInterface/WebKitSystemInterface.h>
46
47 using namespace WebCore;
48
makeFont(const WebFontDescription & description)49 static Font makeFont(const WebFontDescription& description)
50 {
51 AtomicString::init();
52
53 String fontFamilyString(description.family, description.familyLength);
54
55 FontDescription f;
56 FontFamily family;
57 family.setFamily(fontFamilyString);
58 f.setFamily(family);
59 f.setSpecifiedSize(description.size);
60 f.setComputedSize(description.size);
61 f.setItalic(description.italic);
62 f.setWeight(description.bold ? FontWeightBold : FontWeightNormal);
63 f.setIsAbsoluteSize(true);
64
65 FontSmoothingType smoothingType;
66 if (SUCCEEDED(WebPreferences::sharedStandardPreferences()->fontSmoothing(&smoothingType)))
67 f.setRenderingMode(smoothingType == FontSmoothingTypeWindows ? AlternateRenderingMode : NormalRenderingMode);
68
69 Font font(f, 0, 0);
70 font.update(0);
71
72 return font;
73 }
74
75 // Text shadow is added post 3.1.1. In order for nightlies to not break Safari 3.1.1, we should still allow
76 // the old WebTextRenderInfo that has a smaller structSize than the current one with the new text shadow data members.
77 struct WebTextRenderInfoWithoutShadow
78 {
79 DWORD structSize;
80 CGContextRef cgContext;
81 LPCTSTR text;
82 int length;
83 POINT pt;
84 const WebFontDescription* description;
85 CGColorRef color;
86 int underlinedIndex;
87 bool drawAsPassword;
88 int overrideSmoothingLevel; // pass in -1 if caller does not want to override smoothing level
89 };
90
WebDrawText(WebTextRenderInfo * info)91 void WebDrawText(WebTextRenderInfo* info)
92 {
93 if (!info || info->structSize < sizeof(WebTextRenderInfoWithoutShadow) || !info->cgContext || !info->description)
94 return;
95
96 int oldFontSmoothingLevel = -1;
97 if (info->overrideSmoothingLevel >= 0) {
98 oldFontSmoothingLevel = wkGetFontSmoothingLevel();
99 wkSetFontSmoothingLevel(info->overrideSmoothingLevel);
100 }
101
102 {
103 GraphicsContext context(info->cgContext);
104 String drawString(info->text, info->length);
105 if (info->drawAsPassword)
106 drawString = drawString.impl()->secure(WTF::Unicode::bullet);
107
108 context.save();
109
110 // Set shadow setting
111 if (info->structSize == sizeof(WebTextRenderInfo) &&
112 (info->shadowOffset.cx || info->shadowOffset.cy || info->shadowBlur || info->shadowColor))
113 context.setShadow(FloatSize(info->shadowOffset.cx, info->shadowOffset.cy), info->shadowBlur, info->shadowColor, ColorSpaceDeviceRGB);
114
115 WebCoreDrawTextAtPoint(context, drawString, info->pt, makeFont(*(info->description)), info->color, info->underlinedIndex);
116 context.restore();
117 }
118
119 if (info->overrideSmoothingLevel >= 0)
120 wkSetFontSmoothingLevel(oldFontSmoothingLevel);
121 }
122
TextFloatWidth(LPCTSTR text,int length,const WebFontDescription & description)123 float TextFloatWidth(LPCTSTR text, int length, const WebFontDescription& description)
124 {
125 return WebCoreTextFloatWidth(String(text, length), makeFont(description));
126 }
127
FontMetrics(const WebFontDescription & description,int * ascent,int * descent,int * lineSpacing)128 void FontMetrics(const WebFontDescription& description, int* ascent, int* descent, int* lineSpacing)
129 {
130 if (!ascent && !descent && !lineSpacing)
131 return;
132
133 Font font(makeFont(description));
134 const WebCore::FontMetrics& fontMetrics(font.fontMetrics());
135
136 if (ascent)
137 *ascent = fontMetrics.ascent();
138
139 if (descent)
140 *descent = fontMetrics.descent();
141
142 if (lineSpacing)
143 *lineSpacing = fontMetrics.lineSpacing();
144 }
145
CenterTruncateStringToWidth(LPCTSTR text,int length,const WebFontDescription & description,float width,WCHAR * buffer)146 unsigned CenterTruncateStringToWidth(LPCTSTR text, int length, const WebFontDescription& description, float width, WCHAR* buffer)
147 {
148 ASSERT(buffer);
149
150 String result = StringTruncator::centerTruncate(String(text, length), width, makeFont(description));
151 memcpy(buffer, result.characters(), result.length() * sizeof(UChar));
152 buffer[result.length()] = '\0';
153 return result.length();
154 }
155
RightTruncateStringToWidth(LPCTSTR text,int length,const WebFontDescription & description,float width,WCHAR * buffer)156 unsigned RightTruncateStringToWidth(LPCTSTR text, int length, const WebFontDescription& description, float width, WCHAR* buffer)
157 {
158 ASSERT(buffer);
159
160 String result = StringTruncator::rightTruncate(String(text, length), width, makeFont(description));
161 memcpy(buffer, result.characters(), result.length() * sizeof(UChar));
162 buffer[result.length()] = '\0';
163 return result.length();
164 }
165
WebKitSetShouldUseFontSmoothing(bool smooth)166 void WebKitSetShouldUseFontSmoothing(bool smooth)
167 {
168 WebCoreSetShouldUseFontSmoothing(smooth);
169 }
170
WebKitShouldUseFontSmoothing()171 bool WebKitShouldUseFontSmoothing()
172 {
173 return WebCoreShouldUseFontSmoothing();
174 }
175