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
|
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Quick 2D Renderer module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "renderer.h"
#include "renderablenodeupdater.h"
#include "renderlistbuilder.h"
#include "context.h"
#include "renderablenode.h"
#include <QtGui/QWindow>
#include <QtQuick/QSGSimpleRectNode>
#include <QElapsedTimer>
Q_LOGGING_CATEGORY(lcRenderer, "qt.scenegraph.softwarecontext.renderer")
QT_BEGIN_NAMESPACE
namespace SoftwareContext {
Renderer::Renderer(QSGRenderContext *context)
: AbstractSoftwareRenderer(context)
{
}
Renderer::~Renderer()
{
}
void Renderer::renderScene(GLuint)
{
class B : public QSGBindable
{
public:
void bind() const { }
} bindable;
QSGRenderer::renderScene(bindable);
}
void Renderer::render()
{
QElapsedTimer renderTimer;
QWindow *currentWindow = static_cast<RenderContext*>(m_context)->currentWindow;
if (!m_backingStore)
m_backingStore.reset(new QBackingStore(currentWindow));
if (m_backingStore->size() != currentWindow->size()) {
m_backingStore->resize(currentWindow->size());
}
setBackgroundColor(clearColor());
setBackgroundSize(currentWindow->size());
const QRect rect(0, 0, currentWindow->width(), currentWindow->height());
m_backingStore->beginPaint(rect);
QPaintDevice *device = m_backingStore->paintDevice();
#ifndef QTQUICK2D_DEBUG_FLUSH
QPainter painter(device);
#else
if (m_outputBuffer.size() != m_backingStore->size()) {
m_outputBuffer = QImage(m_backingStore->size(), QImage::Format_ARGB32_Premultiplied);
m_outputBuffer.fill(Qt::transparent);
}
QPainter painter(&m_outputBuffer);
#endif
painter.setRenderHint(QPainter::Antialiasing);
// Build Renderlist
// The renderlist is created by visiting each node in the tree and when a
// renderable node is reach, we find the coorosponding RenderableNode object
// and append it to the renderlist. At this point the RenderableNode object
// should not need any further updating so it is just a matter of appending
// RenderableNodes
renderTimer.start();
buildRenderList();
qint64 buildRenderListTime = renderTimer.restart();
// Optimize Renderlist
// This is a pass through the renderlist to determine what actually needs to
// be painted. Without this pass the renderlist will simply render each item
// from back to front, with a high potential for overdraw. It would also lead
// to the entire window being flushed every frame. The objective of the
// optimization pass is to only paint dirty nodes that are not occuluded. A
// side effect of this is that additional nodes may need to be marked dirty to
// force a repaint. It is also important that any item that needs to be
// repainted only paints what is needed, via the use of clip regions.
optimizeRenderList();
qint64 optimizeRenderListTime = renderTimer.restart();
// Render the contents Renderlist
QRegion dirtyRegion = renderNodes(&painter);
qint64 renderTime = renderTimer.elapsed();
qCDebug(lcRenderer) << "render" << dirtyRegion << buildRenderListTime << optimizeRenderListTime << renderTime;
#ifdef QTQUICK2D_DEBUG_FLUSH
// Keep up with the last 5 flushes
if (m_previousFlushes.count() == 5)
m_previousFlushes.pop_front();
m_previousFlushes.append(dirtyRegion);
QPainter backingStorePainter(device);
backingStorePainter.drawImage(QRect(0, 0, m_backingStore->size().width(), m_backingStore->size().height()), m_outputBuffer, m_outputBuffer.rect());
QPen pen(Qt::NoPen);
QBrush brush(QColor(255, 0, 0, 50));
backingStorePainter.setPen(pen);
backingStorePainter.setBrush(brush);
for (auto region : qAsConst(m_previousFlushes)) {
backingStorePainter.drawRects(region.rects());
}
m_backingStore->endPaint();
m_backingStore->flush(rect);
#else
m_backingStore->endPaint();
// Flush the updated regions to the window
m_backingStore->flush(dirtyRegion);
#endif
}
} // namespace
QT_END_NAMESPACE
|
