基于坐标的立绘合成工具

usage:img-cov.exe backgroundfile foregroundfile outputfile x y
img-cov.7z
源代码：

#include<bits/stdc++.h>
#include <io.h>
#include <windows.h>
#include <direct.h> 
#include <opencv2/opencv.hpp>

using namespace cv;
using namespace std;

void overlayImages(const cv::Mat& background, const cv::Mat& foreground, cv::Mat& output, int x, int y) {
	output = background.clone();
	cv::Rect roi(x, y, foreground.cols, foreground.rows);
	roi &= cv::Rect(0, 0, background.cols, background.rows);
	cv::Mat roi_output = output(roi);
	cv::Mat roi_foreground = foreground(cv::Rect(0, 0, roi.width, roi.height));
	for (int i = 0; i < roi.height; ++i) {
		for (int j = 0; j < roi.width; ++j) {
			cv::Vec4b pixel_foreground = roi_foreground.at<cv::Vec4b>(i, j);
			cv::Vec4b& pixel_output = roi_output.at<cv::Vec4b>(i, j);

			double alpha = pixel_foreground[3] / 255.0;
			double beta = 1.0 - alpha;

			for (int k = 0; k < 3; ++k) {
				pixel_output[k] = static_cast<uchar>(alpha * pixel_foreground[k] + beta * pixel_output[k]);
			}
		}
	}
}

void imgset(string path1, string path2,string outpath,int x,int y){
	Mat img1 = cv::imread(path2, cv::IMREAD_UNCHANGED);
	Mat img2 = cv::imread(path1, cv::IMREAD_UNCHANGED);
	Mat mergedImg;
	overlayImages(img1,img2,mergedImg,x,y);
	imwrite(outpath, mergedImg);
	return ;
}

int main(int argc,char *argv[]){
	if(argc!=6){
	    printf("usage:img-cov.exe backgroundfile foregroundfile outputfile x y");
	    return 0;
	}
	else {
	    imgset(argv[2],argv[1],argv[3],atoi(argv[4]),atoi(argv[5]));
	    return 0;
	}
}