1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*
* Copyright (C) 2010 Sencha, Inc.
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "ContextShadow.h"
#include "AffineTransform.h"
#include "GraphicsContext.h"
#include <QPainter>
#include <QTimerEvent>
namespace WebCore {
// ContextShadow needs a scratch image as the buffer for the blur filter.
// Instead of creating and destroying the buffer for every operation,
// we create a buffer which will be automatically purged via a timer.
class ShadowBuffer: public QObject {
public:
ShadowBuffer(QObject* parent = 0);
QImage* scratchImage(const QSize& size);
void schedulePurge();
protected:
void timerEvent(QTimerEvent* event);
private:
QImage image;
int timerId;
};
ShadowBuffer::ShadowBuffer(QObject* parent)
: QObject(parent)
, timerId(0)
{
}
QImage* ShadowBuffer::scratchImage(const QSize& size)
{
int width = size.width();
int height = size.height();
// We do not need to recreate the buffer if the buffer is reasonably
// larger than the requested size. However, if the requested size is
// much smaller than our buffer, reduce our buffer so that we will not
// keep too many allocated pixels for too long.
if (!image.isNull() && (image.width() > width) && (image.height() > height))
if (((2 * width) > image.width()) && ((2 * height) > image.height())) {
image.fill(Qt::transparent);
return ℑ
}
// Round to the nearest 32 pixels so we do not grow the buffer everytime
// there is larger request by 1 pixel.
width = (1 + (width >> 5)) << 5;
height = (1 + (height >> 5)) << 5;
image = QImage(width, height, QImage::Format_ARGB32_Premultiplied);
image.fill(Qt::transparent);
return ℑ
}
void ShadowBuffer::schedulePurge()
{
static const double BufferPurgeDelay = 2; // seconds
killTimer(timerId);
timerId = startTimer(BufferPurgeDelay * 1000);
}
void ShadowBuffer::timerEvent(QTimerEvent* event)
{
if (event->timerId() == timerId) {
killTimer(timerId);
image = QImage();
}
QObject::timerEvent(event);
}
Q_GLOBAL_STATIC(ShadowBuffer, scratchShadowBuffer)
PlatformContext ContextShadow::beginShadowLayer(GraphicsContext* context, const FloatRect& layerArea)
{
// Set m_blurDistance.
adjustBlurDistance(context);
PlatformContext p = context->platformContext();
QRect clipRect;
if (p->hasClipping())
#if QT_VERSION >= QT_VERSION_CHECK(4, 8, 0)
clipRect = p->clipBoundingRect().toAlignedRect();
#else
clipRect = p->clipRegion().boundingRect();
#endif
else
clipRect = p->transform().inverted().mapRect(p->window());
// Set m_layerOrigin, m_layerContextTranslation, m_sourceRect.
IntRect clip(clipRect.x(), clipRect.y(), clipRect.width(), clipRect.height());
IntRect layerRect = calculateLayerBoundingRect(context, layerArea, clip);
// Don't paint if we are totally outside the clip region.
if (layerRect.isEmpty())
return 0;
ShadowBuffer* shadowBuffer = scratchShadowBuffer();
QImage* shadowImage = shadowBuffer->scratchImage(layerRect.size());
m_layerImage = QImage(*shadowImage);
m_layerContext = new QPainter;
m_layerContext->begin(&m_layerImage);
m_layerContext->setFont(p->font());
m_layerContext->translate(m_layerContextTranslation);
return m_layerContext;
}
void ContextShadow::endShadowLayer(GraphicsContext* context)
{
m_layerContext->end();
delete m_layerContext;
m_layerContext = 0;
if (m_type == BlurShadow) {
blurLayerImage(m_layerImage.bits(), IntSize(m_layerImage.width(), m_layerImage.height()),
m_layerImage.bytesPerLine());
}
if (m_type != NoShadow) {
// "Colorize" with the right shadow color.
QPainter p(&m_layerImage);
p.setCompositionMode(QPainter::CompositionMode_SourceIn);
p.fillRect(m_layerImage.rect(), m_color.rgb());
p.end();
}
context->platformContext()->drawImage(m_layerOrigin, m_layerImage, m_sourceRect);
scratchShadowBuffer()->schedulePurge();
}
}
|
