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// -*- Mode: C++; tab-width: 2; -*-
// vi: set ts=2:
//
#include <BALL/VIEW/RENDERING/glOffscreenTarget.h>
#include <QtWidgets/QApplication>
#include <QtGui/QImage>
#include <QtGui/QPaintEvent>
#include <QtGui/QPainter>
#include <QtOpenGL/QGLPixelBuffer>
namespace BALL
{
namespace VIEW
{
GLOffscreenTarget::GLOffscreenTarget(GLRenderWindow* share_from, const String& filename)
: RenderWindow(),
QPaintDevice(),
filename_(filename),
share_from_(share_from),
pixel_buffer_(),
use_pixel_buffer_(QGLPixelBuffer::hasOpenGLPbuffers()),
current_image_(share_from->width(), share_from->height(), QImage::Format_ARGB32)
{
}
void GLOffscreenTarget::prepareRendering()
{
if (use_pixel_buffer_ && pixel_buffer_)
pixel_buffer_->makeCurrent();
else if (share_from_)
share_from_->makeCurrent();
}
bool GLOffscreenTarget::resize(const unsigned int width, const unsigned int height)
{
RenderWindow::resize(width, height);
if (use_pixel_buffer_)
{
pixel_buffer_ = boost::shared_ptr<QGLPixelBuffer>(new QGLPixelBuffer(width, height, share_from_->format(), share_from_));
}
return true;
}
void GLOffscreenTarget::tryUsePixelBuffer(bool use_pbo)
{
use_pixel_buffer_ = QGLPixelBuffer::hasOpenGLPbuffers() && use_pbo;
}
QImage GLOffscreenTarget::getImage()
{
if (use_pixel_buffer_ && pixel_buffer_)
return pixel_buffer_->toImage();
else if (share_from_)
return share_from_->grabFrameBuffer();
return QImage();
}
void GLOffscreenTarget::prepareUpscaling(Size final_width, Size final_height)
{
if (use_pixel_buffer_ && pixel_buffer_)
current_image_ = QImage(final_width, final_height, pixel_buffer_->toImage().format());
else if (share_from_)
current_image_ = QImage(final_width, final_height, share_from_->grabFrameBuffer().format());
QPainter::setRedirected(this, ¤t_image_);
}
void GLOffscreenTarget::updateImageTile(Size x_lower, Size y_lower, Size x_upper, Size y_upper)
{
QImage current_screen;
if (use_pixel_buffer_ && pixel_buffer_)
current_screen = pixel_buffer_->toImage();
else if (share_from_)
current_screen = share_from_->grabFrameBuffer();
if (!current_screen.isNull())
{
// compute the coordinates of the rectangle in the final image (remembering
// that Qt sets y to 0 on the *upper* boundary of the image!)
QPoint top_left(x_lower, current_image_.height() - (y_upper+1));
QPoint bot_right(x_upper, current_image_.height() - (y_lower+1));
QPainter p(¤t_image_);
p.drawImage(QRect(top_left, bot_right), current_screen, current_screen.rect());
p.end();
}
}
void GLOffscreenTarget::refresh()
{
if (!current_image_.isNull())
current_image_.save(filename_.c_str(), "PNG");
}
QPaintEngine* GLOffscreenTarget::paintEngine() const
{
return current_image_.paintEngine();
}
int GLOffscreenTarget::metric(PaintDeviceMetric m) const
{
// Unfortunately, metric() is protected in PaintDevice, so we
// cannot simply redirect the call to current_image_.
// Hence, some tedious conversions have to be made here
int result = 0;
switch (m)
{
case QPaintDevice::PdmWidth:
result = current_image_.width();
break;
case QPaintDevice::PdmHeight:
result = current_image_.height();
break;
case QPaintDevice::PdmWidthMM:
result = current_image_.widthMM();
break;
case QPaintDevice::PdmHeightMM:
result = current_image_.heightMM();
break;
case QPaintDevice::PdmNumColors:
result = current_image_.colorCount();
break;
case QPaintDevice::PdmDepth:
result = current_image_.depth();
break;
case QPaintDevice::PdmDpiX:
result = current_image_.logicalDpiX();
break;
case QPaintDevice::PdmDpiY:
result = current_image_.logicalDpiY();
break;
case QPaintDevice::PdmPhysicalDpiX:
result = current_image_.physicalDpiX();
break;
case QPaintDevice::PdmPhysicalDpiY:
result = current_image_.physicalDpiY();
break;
default:
result = 0;
}
return result;
}
}
}
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