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#include "declarativeviewtexture.h"
#include <QtGui/QPainter>
#include <QtGui/QImage>
#include <QtGui/QPaintEvent>
#include <QtCore/QDebug>
static inline void qgl_byteSwapImage(QImage &img, GLenum pixel_type)
{
const int width = img.width();
const int height = img.height();
if (pixel_type == GL_UNSIGNED_BYTE && QSysInfo::ByteOrder == QSysInfo::LittleEndian)
{
for (int i = 0; i < height; ++i) {
uint *p = (uint *) img.scanLine(i);
for (int x = 0; x < width; ++x)
p[x] = ((p[x] << 16) & 0xff0000) | ((p[x] >> 16) & 0xff) | (p[x] & 0xff00ff00);
}
} else {
for (int i = 0; i < height; ++i) {
uint *p = (uint *) img.scanLine(i);
for (int x = 0; x < width; ++x)
p[x] = (p[x] << 8) | ((p[x] >> 24) & 0xff);
}
}
}
DeclarativeViewTexture::DeclarativeViewTexture(QWidget *parent) :
QDeclarativeView(parent),
m_bufferPainter(0)
{
setAttribute(Qt::WA_DontShowOnScreen);
setOptimizationFlag(QGraphicsView::IndirectPainting);
glGenTextures(1, &m_textureId);
}
DeclarativeViewTexture::~DeclarativeViewTexture()
{
}
void DeclarativeViewTexture::paintEvent(QPaintEvent *event)
{
// Render the view in an offscreen image
delete m_bufferPainter;
m_bufferPainter = new QPainter;
QRegion exposedRegion = event->region();
QImage im(exposedRegion.boundingRect().size(), QImage::Format_ARGB32_Premultiplied);
im.fill(Qt::transparent);
m_bufferPainter->begin(&im);
m_bufferPainter->translate(-exposedRegion.boundingRect().topLeft());
m_bufferPainter->setClipRegion(exposedRegion);
QDeclarativeView::paintEvent(event);
m_bufferPainter->end();
// Upload the image in graphics memory
glBindTexture(GL_TEXTURE_2D, m_textureId);
qgl_byteSwapImage(im, GL_UNSIGNED_BYTE);
foreach (const QRect &rect, exposedRegion.rects()) {
if (rect.size() == size()) {
glTexImage2D(GL_TEXTURE_2D, 0, 4, rect.width(), rect.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, im.bits());
glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
break;
} else {
QRect adjustedRect = rect.translated(-exposedRegion.boundingRect().topLeft());
QImage subIm = im.copy(adjustedRect);
glTexSubImage2D(GL_TEXTURE_2D, 0, rect.left(), rect.top(), rect.width(), rect.height(), GL_RGBA, GL_UNSIGNED_BYTE, subIm.bits());
}
}
glBindTexture(GL_TEXTURE_2D, 0);
}
void DeclarativeViewTexture::drawItems(QPainter *painter, int numItems, QGraphicsItem *items[], const QStyleOptionGraphicsItem options[])
{
QDeclarativeView::drawItems(m_bufferPainter, numItems, items, options);
}
void DeclarativeViewTexture::drawBackground(QPainter *painter, const QRectF &rect)
{
QDeclarativeView::drawBackground(m_bufferPainter, rect);
}
void DeclarativeViewTexture::drawForeground(QPainter *painter, const QRectF &rect)
{
QDeclarativeView::drawForeground(m_bufferPainter, rect);
}
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