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
|
/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QML Shaders plugin 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "shadereffect.h"
#include "shadereffectbuffer.h"
#include "shadereffectsource.h"
#include <QDeclarativeItem>
#include <QPainter>
static QTransform savedWorldTransform;
ShaderEffect::ShaderEffect(QObject *parent)
: QGraphicsEffect(parent)
, m_changed(true)
{
}
ShaderEffect::~ShaderEffect()
{
}
void ShaderEffect::prepareBufferedDraw(QPainter *painter)
{
#ifndef QT_NO_DYNAMIC_CAST
// This workaround needed because QGraphicsEffect seems to always utilize default painters worldtransform
// instead of the active painters worldtransform.
const ShaderEffectBuffer *effectBuffer = dynamic_cast<ShaderEffectBuffer*> (painter->device());
if (effectBuffer) {
savedWorldTransform = painter->worldTransform() * savedWorldTransform;
painter->setWorldTransform(savedWorldTransform);
} else {
savedWorldTransform = painter->worldTransform();
}
#else
Q_UNUSED(painter);
#endif
}
void ShaderEffect::draw (QPainter *painter)
{
const QGLContext *context = QGLContext::currentContext();
prepareBufferedDraw(painter);
if (context) {
updateRenderTargets();
}
if (!context || m_renderTargets.count() == 0 || !hideOriginal())
drawSource(painter);
}
void ShaderEffect::updateRenderTargets()
{
if (!m_changed)
return;
m_changed = false;
int count = m_renderTargets.count();
for (int i = 0; i < count; i++) {
if (m_renderTargets[i]->isLive() || m_renderTargets[i]->isDirtyTexture()) {
m_renderTargets[i]->updateBackbuffer();
ShaderEffectBuffer* target = m_renderTargets[i]->fbo();
if (target && target->isValid() && target->width() > 0 && target->height() > 0) {
QPainter p(target);
p.setCompositionMode(QPainter::CompositionMode_Clear);
p.fillRect(QRect(QPoint(0, 0), target->size()), Qt::transparent);
p.setCompositionMode(QPainter::CompositionMode_SourceOver);
QRectF sourceRect = m_renderTargets[i]->sourceRect();
QSize textureSize = m_renderTargets[i]->textureSize();
qreal yflip = m_renderTargets[i]->isMirrored() ? -1.0 : 1.0; // flip y to match scenegraph, it also flips texturecoordinates
qreal xscale = 1.0;
qreal yscale = 1.0 * yflip;
qreal leftMargin = 0.0;
qreal rightMargin = 0.0;
qreal topMargin = 0.0;
qreal bottomMargin = 0.0;
qreal width = m_renderTargets[i]->sourceItem()->width();
qreal height = m_renderTargets[i]->sourceItem()->height();
if (!sourceRect.isEmpty()) {
leftMargin = -sourceRect.left();
rightMargin = sourceRect.right() - width;
topMargin = -sourceRect.top();
bottomMargin = sourceRect.bottom() - height;
}
if ((width + leftMargin + rightMargin) > 0 && (height + topMargin + bottomMargin) > 0) {
if (!textureSize.isEmpty()) {
qreal textureWidth = textureSize.width();
qreal textureHeight = textureSize.height();
xscale = width / (width + leftMargin + rightMargin);
yscale = height / (height + topMargin + bottomMargin);
p.translate(textureWidth / 2, textureHeight / 2);
p.scale(xscale, yscale * yflip);
p.translate(-textureWidth / 2, -textureHeight / 2);
p.scale(textureWidth / width, textureHeight / height);
} else {
xscale = width / (width + leftMargin + rightMargin);
yscale = height / (height + topMargin + bottomMargin);
p.translate(width / 2, height / 2);
p.scale(xscale, yscale * yflip);
p.translate(-width / 2, -height / 2);
}
}
drawSource(&p);
p.end();
m_renderTargets[i]->markSceneGraphDirty();
}
}
}
}
void ShaderEffect::sourceChanged (ChangeFlags flags)
{
Q_UNUSED(flags);
m_changed = true;
}
void ShaderEffect::addRenderTarget(ShaderEffectSource *target)
{
if (!m_renderTargets.contains(target))
m_renderTargets.append(target);
}
void ShaderEffect::removeRenderTarget(ShaderEffectSource *target)
{
int index = m_renderTargets.indexOf(target);
if (index >= 0)
m_renderTargets.remove(index);
else
qWarning() << "ShaderEffect::removeRenderTarget - did not find target.";
}
bool ShaderEffect::hideOriginal() const
{
if (m_renderTargets.count() == 0)
return false;
// Just like scenegraph version, if there is even one source that says "hide original" we hide it.
int count = m_renderTargets.count();
for (int i = 0; i < count; i++) {
if (m_renderTargets[i]->hideSource())
return true;
}
return false;
}
|
