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#include <iostream>
#include "opencv2/core/opengl_interop.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/gpu/gpu.hpp"
using namespace std;
using namespace cv;
using namespace cv::gpu;
int main()
{
cout << "This program demonstrates using alphaComp" << endl;
cout << "Press SPACE to change compositing operation" << endl;
cout << "Press ESC to exit" << endl;
namedWindow("First Image", WINDOW_NORMAL);
namedWindow("Second Image", WINDOW_NORMAL);
namedWindow("Result", WINDOW_OPENGL);
setGlDevice();
Mat src1(640, 480, CV_8UC4, Scalar::all(0));
Mat src2(640, 480, CV_8UC4, Scalar::all(0));
rectangle(src1, Rect(50, 50, 200, 200), Scalar(0, 0, 255, 128), 30);
rectangle(src2, Rect(100, 100, 200, 200), Scalar(255, 0, 0, 128), 30);
GpuMat d_src1(src1);
GpuMat d_src2(src2);
GpuMat d_res;
imshow("First Image", src1);
imshow("Second Image", src2);
int alpha_op = ALPHA_OVER;
const char* op_names[] =
{
"ALPHA_OVER", "ALPHA_IN", "ALPHA_OUT", "ALPHA_ATOP", "ALPHA_XOR", "ALPHA_PLUS", "ALPHA_OVER_PREMUL", "ALPHA_IN_PREMUL", "ALPHA_OUT_PREMUL",
"ALPHA_ATOP_PREMUL", "ALPHA_XOR_PREMUL", "ALPHA_PLUS_PREMUL", "ALPHA_PREMUL"
};
for(;;)
{
cout << op_names[alpha_op] << endl;
alphaComp(d_src1, d_src2, d_res, alpha_op);
imshow("Result", d_res);
char key = static_cast<char>(waitKey());
if (key == 27)
break;
if (key == 32)
{
++alpha_op;
if (alpha_op > ALPHA_PREMUL)
alpha_op = ALPHA_OVER;
}
}
return 0;
}
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