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#include "backdrop.h"
#include <QApplication>
#include <QDesktopWidget>
#include <QPainter>
#include <QPaintEvent>
#include <QPixmap>
#include <QRgb>
Backdrop::Backdrop() :
QWidget(NULL),
screenshot(NULL),
mainWindow(NULL)
{
QPixmap shot = QPixmap::grabWindow(QApplication::desktop()->winId());
if (!shot.isNull() && shot.height() > 0) {
QImage img = shot.toImage();
if (img.format() != QImage::Format_RGB32) {
img = img.convertToFormat(QImage::Format_RGB32);
}
for (int i = 0; i < img.height(); ++i) {
uchar *line = img.scanLine(i);
if (line == NULL)
continue;
QRgb *rgb = (QRgb*)line;
for (int x = 0; x < img.width(); ++x) {
const int val = (qRed(*rgb)*11 + qGreen(*rgb)*16 + qBlue(*rgb)*5) / 32;
*rgb = qRgb(val, val, val);
rgb++;
}
}
shot = QPixmap::fromImage(img);
}
screenshot = new QPixmap(shot);
this->resize(screenshot->width(), screenshot->height());
this->setWindowFlags(Qt::Tool | Qt::CustomizeWindowHint | Qt::FramelessWindowHint);
}
Backdrop::~Backdrop()
{
delete screenshot;
}
void Backdrop::paintEvent(QPaintEvent * event)
{
QPainter p(this);
p.drawPixmap(event->rect(), *screenshot, event->rect());
}
void Backdrop::mouseReleaseEvent(QMouseEvent * event)
{
if (mainWindow != NULL) {
mainWindow->raise();
mainWindow->activateWindow();
}
}
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