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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or 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.GPL2 and 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-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qiosbackingstore.h"
#include "qioswindow.h"
#include <QtGui/QOpenGLContext>
#include <QtGui/QOpenGLPaintDevice>
#include <QtGui/QOpenGLFramebufferObject>
#include <QtGui/QOffscreenSurface>
#include <QtGui/qpainter.h>
#include <QtGui/private/qwindow_p.h>
#include <QtDebug>
QT_BEGIN_NAMESPACE
class QIOSPaintDevice : public QOpenGLPaintDevice
{
public:
QIOSPaintDevice(QIOSBackingStore *backingStore) : m_backingStore(backingStore) { }
void ensureActiveTarget() Q_DECL_OVERRIDE;
private:
QIOSBackingStore *m_backingStore;
};
void QIOSPaintDevice::ensureActiveTarget()
{
m_backingStore->makeCurrent();
}
/*!
\class QIOSBackingStore
\brief The QPlatformBackingStore on iOS.
QBackingStore enables the use of QPainter to paint on a QWindow, as opposed
to rendering to a QWindow through the use of OpenGL with QOpenGLContext.
Historically, the iOS port initially implemented the backing store by using
an QOpenGLPaintDevice as its paint device, triggering the use of the OpenGL
paint engine for QPainter based drawing. This was due to raster drawing
operations being too slow when not being NEON-optimized, and got the port
up and running quickly.
As of 3e892e4a97, released in Qt 5.7, the backing store now uses a QImage,
for its paint device, giving normal raster-based QPainter operations, and
enabling features such as antialiased drawing.
To account for regressions in performance, the old code path is still
available by setting the surface type of the QWindow to OpenGLSurface.
This surface type is normally used when rendering though QOpenGLContext,
but will in the case of QIOSBackingStore trigger the old OpenGL based
painter.
This fallback path is not too intrusive, as the QImage based path still
uses OpenGL to composite the image at flush() time using composeAndFlush.
*/
QIOSBackingStore::QIOSBackingStore(QWindow *window)
: QRasterBackingStore(window)
, m_context(new QOpenGLContext)
, m_glDevice(nullptr)
{
QSurfaceFormat fmt = window->requestedFormat();
// Due to sharing QIOSContext redirects our makeCurrent on window() attempts to
// the global share context. Hence it is essential to have a compatible format.
fmt.setDepthBufferSize(QSurfaceFormat::defaultFormat().depthBufferSize());
fmt.setStencilBufferSize(QSurfaceFormat::defaultFormat().stencilBufferSize());
if (fmt.depthBufferSize() == 0)
qWarning("No depth in default format, expect rendering errors");
// We use the surface both for raster operations and for GL drawing (when
// we blit the raster image), so the type needs to cover both use cases.
if (window->surfaceType() == QSurface::RasterSurface)
window->setSurfaceType(QSurface::RasterGLSurface);
m_context->setFormat(fmt);
m_context->setScreen(window->screen());
Q_ASSERT(QOpenGLContext::globalShareContext());
m_context->setShareContext(QOpenGLContext::globalShareContext());
m_context->create();
}
QIOSBackingStore::~QIOSBackingStore()
{
if (window()->surfaceType() == QSurface::RasterGLSurface) {
// We're using composeAndFlush from QPlatformBackingStore, which
// need to clean up any textures in its destructor, so make the
// context current and keep it alive until QPlatformBackingStore
// has cleaned up everything.
makeCurrent();
m_context->deleteLater();
} else {
delete m_context;
}
delete m_glDevice;
}
void QIOSBackingStore::makeCurrent()
{
if (!m_context->makeCurrent(window()))
qWarning("QIOSBackingStore: makeCurrent() failed");
}
void QIOSBackingStore::beginPaint(const QRegion ®ion)
{
makeCurrent();
if (!m_glDevice)
m_glDevice = new QIOSPaintDevice(this);
if (window()->surfaceType() == QSurface::RasterGLSurface)
QRasterBackingStore::beginPaint(region);
}
void QIOSBackingStore::endPaint()
{
}
QPaintDevice *QIOSBackingStore::paintDevice()
{
Q_ASSERT(m_glDevice);
// Keep paint device size and device pixel ratio in sync with window
qreal devicePixelRatio = window()->devicePixelRatio();
m_glDevice->setSize(window()->size() * devicePixelRatio);
m_glDevice->setDevicePixelRatio(devicePixelRatio);
if (window()->surfaceType() == QSurface::RasterGLSurface)
return QRasterBackingStore::paintDevice();
else
return m_glDevice;
}
void QIOSBackingStore::flush(QWindow *window, const QRegion ®ion, const QPoint &offset)
{
Q_ASSERT(!qt_window_private(window)->compositing);
Q_UNUSED(region);
Q_UNUSED(offset);
if (window != this->window()) {
// We skip flushing raster-based child windows, to avoid the extra cost of copying from the
// parent FBO into the child FBO. Since the child is already drawn inside the parent FBO, it
// will become visible when flushing the parent. The only case we end up not supporting is if
// the child window overlaps a sibling window that's draws using a separate QOpenGLContext.
return;
}
if (window->surfaceType() == QSurface::RasterGLSurface) {
static QPlatformTextureList emptyTextureList;
composeAndFlush(window, region, offset, &emptyTextureList, m_context, false);
} else {
m_context->makeCurrent(window);
m_context->swapBuffers(window);
}
}
void QIOSBackingStore::resize(const QSize &size, const QRegion &staticContents)
{
Q_UNUSED(staticContents);
if (window()->surfaceType() == QSurface::OpenGLSurface) {
// Resizing the backing store would in this case mean resizing the QWindow,
// as we use an QOpenGLPaintDevice that we target at the window. That's
// probably not what the user intended, so we ignore resizes of the backing
// store and always keep the paint device's size in sync with the window
// size in beginPaint().
if (size != window()->size() && !window()->inherits("QWidgetWindow"))
qWarning("QIOSBackingStore needs to have the same size as its window");
return;
}
QRasterBackingStore::resize(size, staticContents);
}
QT_END_NAMESPACE
|
