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/****************************************************************************
**
** Copyright (C) 2016 Canonical, 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 "qmirclientbackingstore.h"
#include "qmirclientlogging.h"
#include <QtGui/QOpenGLContext>
#include <QtGui/QOpenGLTexture>
#include <QtGui/QMatrix4x4>
#include <QtGui/qopengltextureblitter.h>
#include <QtGui/qopenglfunctions.h>
QMirClientBackingStore::QMirClientBackingStore(QWindow* window)
: QPlatformBackingStore(window)
, mContext(new QOpenGLContext)
, mTexture(new QOpenGLTexture(QOpenGLTexture::Target2D))
, mBlitter(new QOpenGLTextureBlitter)
{
mContext->setFormat(window->requestedFormat());
mContext->setScreen(window->screen());
mContext->create();
window->setSurfaceType(QSurface::OpenGLSurface);
}
QMirClientBackingStore::~QMirClientBackingStore()
{
mContext->makeCurrent(window()); // needed as QOpenGLTexture destructor assumes current context
}
void QMirClientBackingStore::flush(QWindow* window, const QRegion& region, const QPoint& offset)
{
Q_UNUSED(region);
Q_UNUSED(offset);
mContext->makeCurrent(window);
glViewport(0, 0, window->width(), window->height());
updateTexture();
if (!mBlitter->isCreated())
mBlitter->create();
mBlitter->bind();
mBlitter->blit(mTexture->textureId(), QMatrix4x4(), QOpenGLTextureBlitter::OriginTopLeft);
mBlitter->release();
mContext->swapBuffers(window);
}
void QMirClientBackingStore::updateTexture()
{
if (mDirty.isNull())
return;
if (!mTexture->isCreated()) {
mTexture->setMinificationFilter(QOpenGLTexture::Nearest);
mTexture->setMagnificationFilter(QOpenGLTexture::Nearest);
mTexture->setWrapMode(QOpenGLTexture::ClampToEdge);
mTexture->setData(mImage, QOpenGLTexture::DontGenerateMipMaps);
mTexture->create();
}
mTexture->bind();
QRegion fixed;
QRect imageRect = mImage.rect();
for (const QRect &rect : mDirty) {
// intersect with image rect to be sure
QRect r = imageRect & rect;
// if the rect is wide enough it is cheaper to just extend it instead of doing an image copy
if (r.width() >= imageRect.width() / 2) {
r.setX(0);
r.setWidth(imageRect.width());
}
fixed |= r;
}
for (const QRect &rect : fixed) {
// if the sub-rect is full-width we can pass the image data directly to
// OpenGL instead of copying, since there is no gap between scanlines
if (rect.width() == imageRect.width()) {
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, rect.y(), rect.width(), rect.height(), GL_RGBA, GL_UNSIGNED_BYTE,
mImage.constScanLine(rect.y()));
} else {
glTexSubImage2D(GL_TEXTURE_2D, 0, rect.x(), rect.y(), rect.width(), rect.height(), GL_RGBA, GL_UNSIGNED_BYTE,
mImage.copy(rect).constBits());
}
}
/* End of code taken from QEGLPlatformBackingStore */
mDirty = QRegion();
}
void QMirClientBackingStore::beginPaint(const QRegion& region)
{
mDirty |= region;
}
void QMirClientBackingStore::resize(const QSize& size, const QRegion& /*staticContents*/)
{
mImage = QImage(size, QImage::Format_RGBA8888);
mContext->makeCurrent(window());
if (mTexture->isCreated())
mTexture->destroy();
}
QPaintDevice* QMirClientBackingStore::paintDevice()
{
return &mImage;
}
QImage QMirClientBackingStore::toImage() const
{
// used by QPlatformBackingStore::composeAndFlush
return mImage;
}
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