图像处理

#include<graphics.h>
#include<conio.h>

void Mosaic(IMAGE *img, int size, int sx, int sy)
{
    int width = img->getheight();//获取图形的宽
    int height = img->getwidth();
    int redsum;//红色的值的和
    int bluesum;//蓝色值的和
    int greensum;//绿色值和
    int counnt;//每个小方块内的像素数量
    int color;//每个像素的颜色
    int x, y, tx, ty;
    DWORD* p = GetImageBuffer(img);//获取指向显存的指针

    //求左上角第一个樊哙的坐标
    sx = (sx%size==0?0:sx%size-size);
    sy = (sy%size == 0 ? 0 : sy%size - size);
    //循环小方块
    for (y = sy; y < height;y+=size)
    {
        for (x = sx; x < width;x+=size)
        {
            redsum = greensum = bluesum = counnt = 0;
            //遍历像素点
            for (ty = min(y + size, height) - 1; ty >= max(y, 0); ty--)
            {
                for (tx = min(x + size, width)-1; tx >= max(x, 0); tx--)
                {
                    color = p[ty*width + tx];
                    redsum += GetRValue(color);
                    greensum+=GetGValue(color);
                    bluesum += GetBValue(color);
                    counnt++;
                }
            }


            redsum /= counnt;
            greensum /= counnt;
            bluesum /= counnt;
            color = RGB(redsum, greensum, bluesum);
            for (ty = min(y + size, height) - 1; ty >= max(y, 0); ty--)
            {
                for (tx = min(x + size, width) - 1; tx >= max(x, 0); tx--)
                {
                    p[ty*width + tx] = color;
                }
            }

        }
    }

}

int main()
{
    //搭建绘图环境
    initgraph(640, 480);
    //setbkcolor(RED);
    //cleardevice();
    IMAGE img;
    loadimage(&img,L"11.jpg", 640, 480);
    putimage(0, 0, &img);
    _getch();
    Mosaic(&img, 5, 0, 0);
    putimage(0,0,&img);
    //loadimage(NULL,L"11.jpg");
    _getch();
    return 0;
}