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/* Copyright (c) 2012 Patrick Ruoff
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* 20130312, WVR: Add 7 lines to resizeGL after resize_frame. This should lower CPU-load.
*/
#include "video_widget.h"
#include <QDebug>
using namespace cv;
using namespace std;
using namespace boost;
// ----------------------------------------------------------------------------
void VideoWidget::initializeGL()
{
glClearColor(0.0, 0.0, 0.0, 0.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void VideoWidget::resizeGL(int w, int h)
{
// setup 1 to 1 projection
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, w, 0, h, -1, 1);
resize_frame();
glDisable(GL_DEPTH_TEST);
glBegin(GL_QUADS);
glVertex2f(0,0);
glVertex2f(1,0);
glVertex2f(1,1);
glVertex2f(0,1);
glEnd();
}
void VideoWidget::paintGL()
{
glClear(GL_COLOR_BUFFER_BIT);
if (!resized_qframe.isNull())
{
glDrawPixels(resized_qframe.width(), resized_qframe.height(), GL_RGBA, GL_UNSIGNED_BYTE, resized_qframe.bits());
const int crosshair_radius = 10;
const int crosshair_thickness = 1;
glColor3f(1.0, 0.0, 0.0);
glLineWidth(crosshair_thickness);
int x,y;
for (vector<Vec2f>::iterator iter = points->begin();
iter != points->end();
++iter)
{
x = (*iter)[0] * resized_qframe.width() + resized_qframe.width()/2.0 + 0.5;
y = (*iter)[1] * resized_qframe.width() + resized_qframe.height()/2.0 + 0.5;
glBegin(GL_LINES);
glVertex2i(x-crosshair_radius, y);
glVertex2i(x+crosshair_radius, y);
glEnd();
glBegin(GL_LINES);
glVertex2i(x, y-crosshair_radius);
glVertex2i(x, y+crosshair_radius);
glEnd();
}
}
glFlush();
}
void VideoWidget::resize_frame()
{
if (!qframe.isNull())
resized_qframe = qframe.scaled(this->size(), Qt::KeepAspectRatio);
}
void VideoWidget::update(Mat frame, shared_ptr< vector<Vec2f> > points)
{
this->frame = frame;
this->points = points;
// convert to QImage
if (frame.channels() == 3)
qframe = QImage((const unsigned char*)(frame.data), frame.cols, frame.rows, frame.step, QImage::Format_RGB888).rgbSwapped();
else if (frame.channels() == 1)
qframe = QImage((const unsigned char*)(frame.data), frame.cols, frame.rows, frame.step, QImage::Format_Indexed8);
qframe = QGLWidget::convertToGLFormat(qframe);
resize_frame();
updateGL();
}
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