1 /*
2 * Copyright (C) 2010 Google 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 are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include "config.h"
32 #include "web/WebFontImpl.h"
33
34 #include "platform/fonts/FontCache.h"
35 #include "platform/fonts/FontDescription.h"
36 #include "platform/graphics/GraphicsContext.h"
37 #include "platform/text/TextRun.h"
38 #include "public/platform/WebFloatPoint.h"
39 #include "public/platform/WebFloatRect.h"
40 #include "public/platform/WebRect.h"
41 #include "public/web/WebFontDescription.h"
42 #include "public/web/WebTextRun.h"
43 #include <skia/ext/platform_canvas.h>
44
45 using namespace WebCore;
46
47 namespace blink {
48
create(const WebFontDescription & desc)49 WebFont* WebFont::create(const WebFontDescription& desc)
50 {
51 return new WebFontImpl(desc);
52 }
53
WebFontImpl(const FontDescription & desc)54 WebFontImpl::WebFontImpl(const FontDescription& desc)
55 : m_font(desc)
56 {
57 m_font.update(nullptr);
58 }
59
fontDescription() const60 WebFontDescription WebFontImpl::fontDescription() const
61 {
62 return WebFontDescription(m_font.fontDescription());
63 }
64
ascent() const65 int WebFontImpl::ascent() const
66 {
67 return m_font.fontMetrics().ascent();
68 }
69
descent() const70 int WebFontImpl::descent() const
71 {
72 return m_font.fontMetrics().descent();
73 }
74
height() const75 int WebFontImpl::height() const
76 {
77 return m_font.fontMetrics().height();
78 }
79
lineSpacing() const80 int WebFontImpl::lineSpacing() const
81 {
82 return m_font.fontMetrics().lineSpacing();
83 }
84
xHeight() const85 float WebFontImpl::xHeight() const
86 {
87 return m_font.fontMetrics().xHeight();
88 }
89
drawText(WebCanvas * canvas,const WebTextRun & run,const WebFloatPoint & leftBaseline,WebColor color,const WebRect & clip,bool canvasIsOpaque,int from,int to) const90 void WebFontImpl::drawText(WebCanvas* canvas, const WebTextRun& run, const WebFloatPoint& leftBaseline,
91 WebColor color, const WebRect& clip, bool canvasIsOpaque,
92 int from, int to) const
93 {
94 FontCachePurgePreventer fontCachePurgePreventer;
95 WebCore::FloatRect textClipRect(clip);
96 TextRun textRun(run);
97 TextRunPaintInfo runInfo(textRun);
98 runInfo.from = from;
99 runInfo.to = to == -1 ? textRun.length() : to;
100 runInfo.bounds = textClipRect;
101 GraphicsContext gc(canvas);
102
103 gc.save();
104 gc.setCertainlyOpaque(canvasIsOpaque);
105 gc.setFillColor(color);
106 gc.clip(textClipRect);
107 m_font.drawText(&gc, runInfo, leftBaseline);
108 gc.restore();
109 }
110
calculateWidth(const WebTextRun & run) const111 int WebFontImpl::calculateWidth(const WebTextRun& run) const
112 {
113 FontCachePurgePreventer fontCachePurgePreventer;
114 return m_font.width(run, 0);
115 }
116
offsetForPosition(const WebTextRun & run,float position) const117 int WebFontImpl::offsetForPosition(const WebTextRun& run, float position) const
118 {
119 FontCachePurgePreventer fontCachePurgePreventer;
120 return m_font.offsetForPosition(run, position, true);
121 }
122
selectionRectForText(const WebTextRun & run,const WebFloatPoint & leftBaseline,int height,int from,int to) const123 WebFloatRect WebFontImpl::selectionRectForText(const WebTextRun& run, const WebFloatPoint& leftBaseline, int height, int from, int to) const
124 {
125 FontCachePurgePreventer fontCachePurgePreventer;
126 return m_font.selectionRectForText(run, leftBaseline, height, from, to);
127 }
128
129 } // namespace blink
130