zoukankan      html  css  js  c++  java
  • 不同的色深条件(8、16、24、32),像素绘制方式

    lpddsprimary->Lock(NULL,&ddsd,
                  DDLOCK_SURFACEMEMORYPTR | DDLOCK_WAIT,NULL);

    // get video pointer to primary surface
    // cast to VOID * since we don't know what we are
    // dealing with yet
    UCHAR *primary_buffer = (UCHAR *)ddsd.lpSurface;      

    // what is the color depth?
    if (pixel_format == 32)
       {
        // draw 10 random pixels in 32 bit mode
        for (int index=0; index<10; index++)
            {
            int x=rand()%(client.right - client.left) + client.left;
            int y=rand()%(client.bottom - client.top) + client.top;
            DWORD color = _RGB32BIT(0,rand()%256, rand()%256, rand()%256);
            *((DWORD *)(primary_buffer + x*4 + y*ddsd.lPitch)) = color;
            } // end for index
        } // end if 24 bit

    else
    if (pixel_format == 24)
       {
        // draw 10 random pixels in 24 bit mode (very rare???)
        for (int index=0; index<10; index++)
            {
            int x=rand()%(client.right - client.left) + client.left;
            int y=rand()%(client.bottom - client.top) + client.top;
            ((primary_buffer + x*3 + y*ddsd.lPitch))[0] = rand()%256;
            ((primary_buffer + x*3 + y*ddsd.lPitch))[1] = rand()%256;
            ((primary_buffer + x*3 + y*ddsd.lPitch))[2] = rand()%256;
            } // end for index
        } // end if 24 bit
    else

    if (pixel_format == 16)
        {
        // draw 10 random pixels in 16 bit mode
        for (int index=0; index<10; index++)
            {
            int x=rand()%(client.right - client.left) + client.left;
            int y=rand()%(client.bottom - client.top) + client.top;
            USHORT color = _RGB16BIT565(rand()%256, rand()%256, rand()%256);
            *((USHORT *)(primary_buffer + x*2 + y*ddsd.lPitch)) = color;
            } // end for index
        } // end if 16 bit
    else
        {// assume 8 bits per pixel
        // draw 10 random pixels in 8 bit mode
        for (int index=0; index<10; index++)
            {
            int x=rand()%(client.right - client.left) + client.left;
            int y=rand()%(client.bottom - client.top) + client.top;
            UCHAR color = rand()%256;
            primary_buffer[x + y*ddsd.lPitch] = color;
            } // end for index
        } // end else

    // unlock primary buffer
    if (FAILED(lpddsprimary->Unlock(NULL)))
       return(0);

  • 相关阅读:
    非凸优化的方法
    随机梯度下降与批量梯度下降
    python requests用于测试
    Vscode中运行js文件或部分代码 ,在下面cmd输出中显示结果
    ts问题处理(2): 'Promise' only refers to a type, but is being used as a value here.
    typeScript入门基础 (1)
    node启动服务报错Node.js Error: Cannot find module express
    能改变this各种情况下的总结,还有没有总结到的,请留言!!
    flutter安装与配置 v1.2.1版本
    vue项目webpack打包后有的文件big 问题
  • 原文地址:https://www.cnblogs.com/orangeblog/p/2816074.html
Copyright © 2011-2022 走看看