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/****************************************************************************
**
** Copyright (C) 2014 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.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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;
}
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