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
45namespace blink {
46
47WebFont* WebFont::create(const WebFontDescription& desc)
48{
49    return new WebFontImpl(desc);
50}
51
52WebFontImpl::WebFontImpl(const FontDescription& desc)
53    : m_font(desc)
54{
55    m_font.update(nullptr);
56}
57
58WebFontDescription WebFontImpl::fontDescription() const
59{
60    return WebFontDescription(m_font.fontDescription());
61}
62
63int WebFontImpl::ascent() const
64{
65    return m_font.fontMetrics().ascent();
66}
67
68int WebFontImpl::descent() const
69{
70    return m_font.fontMetrics().descent();
71}
72
73int WebFontImpl::height() const
74{
75    return m_font.fontMetrics().height();
76}
77
78int WebFontImpl::lineSpacing() const
79{
80    return m_font.fontMetrics().lineSpacing();
81}
82
83float WebFontImpl::xHeight() const
84{
85    return m_font.fontMetrics().xHeight();
86}
87
88void WebFontImpl::drawText(WebCanvas* canvas, const WebTextRun& run, const WebFloatPoint& leftBaseline,
89                           WebColor color, const WebRect& clip, bool canvasIsOpaque,
90                           int from, int to) const
91{
92    FontCachePurgePreventer fontCachePurgePreventer;
93    FloatRect textClipRect(clip);
94    TextRun textRun(run);
95    TextRunPaintInfo runInfo(textRun);
96    runInfo.from = from;
97    runInfo.to = to == -1 ? textRun.length() : to;
98    runInfo.bounds = textClipRect;
99    GraphicsContext gc(canvas);
100
101    gc.save();
102    gc.setCertainlyOpaque(canvasIsOpaque);
103    gc.setFillColor(color);
104    gc.clip(textClipRect);
105    m_font.drawText(&gc, runInfo, leftBaseline);
106    gc.restore();
107}
108
109int WebFontImpl::calculateWidth(const WebTextRun& run) const
110{
111    FontCachePurgePreventer fontCachePurgePreventer;
112    return m_font.width(run, 0);
113}
114
115int WebFontImpl::offsetForPosition(const WebTextRun& run, float position) const
116{
117    FontCachePurgePreventer fontCachePurgePreventer;
118    return m_font.offsetForPosition(run, position, true);
119}
120
121WebFloatRect WebFontImpl::selectionRectForText(const WebTextRun& run, const WebFloatPoint& leftBaseline, int height, int from, int to) const
122{
123    FontCachePurgePreventer fontCachePurgePreventer;
124    return m_font.selectionRectForText(run, leftBaseline, height, from, to);
125}
126
127} // namespace blink
128