方法一：直接将原来的putimage函数替换成下面这个函数
void drawAlpha(IMAGE* picture, int picture_x, int picture_y) //x为载入图片的X坐标，y为Y坐标
{// 变量初始化DWORD *dst = GetImageBuffer(); // GetImageBuffer()函数，用于获取绘图设备的显存指针，EASYX自带DWORD *draw = GetImageBuffer();DWORD *src = GetImageBuffer(picture); //获取picture的显存指针int picture_width = picture->getwidth(); //获取picture的宽度，EASYX自带int picture_height = picture->getheight(); //获取picture的高度，EASYX自带int graphWidth = getwidth(); //获取绘图区的宽度，EASYX自带int graphHeight = getheight(); //获取绘图区的高度，EASYX自带int dstX = 0; //在显存里像素的角标// 实现透明贴图 公式： Cp=αp*FP+(1-αp)*BP ， 贝叶斯定理来进行点颜色的概率计算for (int iy = 0; iy < picture_height; iy++){for (int ix = 0; ix < picture_width; ix++){int srcX = ix + iy * picture_width; //在显存里像素的角标int sa = ((src[srcX] & 0xff000000) >> 24); //0xAArrggbb;AA是透明度int sr = ((src[srcX] & 0xff0000) >> 16); //获取RGB里的Rint sg = ((src[srcX] & 0xff00) >> 8); //Gint sb = src[srcX] & 0xff; //Bif (ix >= 0 && ix <= graphWidth && iy >= 0 && iy <= graphHeight && dstX <= graphWidth * graphHeight){dstX = (ix + picture_x) + (iy + picture_y) * graphWidth; //在显存里像素的角标int dr = ((dst[dstX] & 0xff0000) >> 16);int dg = ((dst[dstX] & 0xff00) >> 8);int db = dst[dstX] & 0xff;draw[dstX] = ((sr * sa / 255 + dr * (255 - sa) / 255) << 16) //公式： Cp=αp*FP+(1-αp)*BP ； αp=sa/255 , FP=sr , BP=dr| ((sg * sa / 255 + dg * (255 - sa) / 255) << 8) //αp=sa/255 , FP=sg , BP=dg| (sb * sa / 255 + db * (255 - sa) / 255); //αp=sa/255 , FP=sb , BP=db}}}
}
方法二：先链接一个库，再将原来的putimage函数替换成下面这个函数
#pragma comment(lib,"MSIMG32.LIB")
inline void putimage_alpha(int x, int y, IMAGE* img)
{int w = img->getwidth();int h = img->getheight();AlphaBlend(GetImageHDC(NULL), x, y, w, h,GetImageHDC(img), 0, 0, w, h, { AC_SRC_OVER,0,255,AC_SRC_ALPHA });
}
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