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/*
* Copyright (C) 2014 Canonical, Ltd.
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License version 3, as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranties of MERCHANTABILITY,
* SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "qmirclientbackingstore.h"
#include "qmirclientlogging.h"
#include <QtGui/QOpenGLContext>
#include <QtGui/QOpenGLTexture>
#include <QtGui/QMatrix4x4>
#include <QtGui/private/qopengltextureblitter_p.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()
{
}
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->setSwizzleRB(true);
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();
/* Following code taken from QEGLPlatformBackingStore under the terms of the Lesser GPL v2.1 licence
* Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies). */
Q_FOREACH (const QRect &rect, mDirty.rects()) {
// 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;
}
Q_FOREACH (const QRect &rect, fixed.rects()) {
// 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_RGB32);
if (mTexture->isCreated())
mTexture->destroy();
}
QPaintDevice* QMirClientBackingStore::paintDevice()
{
return &mImage;
}
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