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DirectX3D9 技术实现的抓屏,支持保存为bmp,jpg,png等格式  

2008-07-17 16:00:32|  分类: 程序设计 |  标签: |举报 |字号 订阅

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在VS2003, DirectX9, Windows xp中测试通过,可能需要安装 DirectXSDK才能编译成功的。
现在前面加上头文件和库, 然后需要截屏的时候,调用capture函数就可以了。

// Direct3D9 includes
#include <d3d9.h>
#include <d3dx9.h>
#pragma comment( lib, "d3d9.lib" )
#pragma comment( lib, "d3dx9.lib" )

int Capture ()
{
LPDIRECT3D9 g_pD3D = NULL;
D3DDISPLAYMODE ddm;
D3DPRESENT_PARAMETERS d3dpp;

IDirect3DDevice9 * g_pd3dDevice;
IDirect3DSurface9 * pSurface;

ZeroMemory(&d3dpp,sizeof(D3DPRESENT_PARAMETERS));
ZeroMemory( &d3dpp, sizeof(d3dpp) );


if((g_pD3D=Direct3DCreate9(D3D_SDK_VERSION))==NULL)
{
   return 1;
}
if(FAILED(g_pD3D->GetAdapterDisplayMode(D3DADAPTER_DEFAULT,&ddm)))
{
   return 1;
}

d3dpp.Windowed=TRUE;
d3dpp.Flags=D3DPRESENTFLAG_LOCKABLE_BACKBUFFER;
d3dpp.BackBufferFormat=ddm.Format;
d3dpp.BackBufferHeight=ddm.Height;
d3dpp.BackBufferWidth=ddm.Width;
d3dpp.MultiSampleType=D3DMULTISAMPLE_NONE;
d3dpp.SwapEffect=D3DSWAPEFFECT_DISCARD;
d3dpp.hDeviceWindow=GetDesktopWindow();
d3dpp.PresentationInterval=D3DPRESENT_INTERVAL_DEFAULT;
d3dpp.FullScreen_RefreshRateInHz=D3DPRESENT_RATE_DEFAULT;


if(FAILED(g_pD3D->CreateDevice(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,GetDesktopWindow(),D3DCREATE_SOFTWARE_VERTEXPROCESSING ,&d3dpp,&g_pd3dDevice)))
{
   return 1;
}

if(FAILED(g_pd3dDevice->CreateOffscreenPlainSurface(ddm.Width, ddm.Height, D3DFMT_A8R8G8B8, D3DPOOL_SCRATCH, &pSurface, NULL)))
{
   return 1;
}

    g_pd3dDevice->CreateOffscreenPlainSurface(1024, 768,
    D3DFMT_A8R8G8B8, D3DPOOL_SCRATCH, &pSurface, NULL);
    g_pd3dDevice->GetFrontBufferData(0, pSurface);

    D3DXSaveSurfaceToFile("Desktop.png",D3DXIFF_PNG,pSurface,NULL,NULL);//s保存为png格式
    D3DXSaveSurfaceToFile("Desktop.jpg",D3DXIFF_JPG,pSurface,NULL,NULL);//保存为 jpg格式
    D3DXSaveSurfaceToFile("Desktop.bmp",D3DXIFF_BMP,pSurface,NULL,NULL);//保存为 bmp格式
    pSurface->Release();
    g_pd3dDevice->Release ();
    g_pD3D->Release ();

return 0;

}

//但这种方法并不能抓取有的播放器的图像,这是因为播放器显示页面时采用了hardware overlay (硬件加速),
//你需要在“显示” 设置里面禁用该功能。或者有时你会发现,你多开一个播放器窗口,后面的就可以抓屏了,因为
//overlay 技术的硬件支持有限,后面的不能再用这个技术了。有的人说编程hook 了DirectDraw的相应函数可以禁用
//这个功能。有的抓屏软件也可以做到,不知道人家是怎么做的。

//下面是些参考资料:
//Video Renderer (VR)是接收RGB/YUV裸数据,然后在显示器上显示的Filter。
//为提高计算机画图性能,根据你计算机显卡的能力,VR会优先使用DirectDraw以及Overlay表面;
//如果这些特性得不到显卡的支持,VR会使用GDI函数进行画图
//Video Mixing Renderer Filter 7 (VMR-7),
//可以这么说,VMR是Windows平台上新一代的Video Renderer。

//视频覆盖(Video Overlay) 或者说是hardware overlay 是早期的技术, 现在好像是VMR-7 , VMR-9 了

//
//One consequence of hardware overlay use is that a screenshot program (for example,
//the one automatically built into Windows that activates when the PrtSc key is pressed)
//often does not capture the content appearing in the hardware overlay window. Rather,
//a blank region containing only the special mask color is captured. This is because the
//screen capture routine doesn't consider the special video memory regions dedicated to
//overlays - it simply captures the shared main screen as rendered by the software's graphical
//subsystem. Some Digital Rights Management schemes use hardware overlay to display
//protected content on the screen, taking advantage of this quirk to prevent the copying of
//protected documents by way of screen capture[citation needed]. Disabling the support for
//overlays causes the normally overlay using software to fallback to the shared memory,
//enabling screenshots.

//Starting with Windows Vista's enhanced graphics capabilities, the basic concept
//of hardware overlays is replaced by full hardware compositing for every application window
//running on the system, not just movie players or games, through the Desktop Window Manager.
//Mac OS X has been using hardware compositing since Quartz Extreme was introduced in Mac OS X 10.2.
//To improve performance, each program draws to its own independent memory buffer instead of to a
//slow graphical subsystem. (In Windows Vista, each hardware overlay is more correctly known as
//a Direct3D surface). Then, the system's GPU assembles each of the windows into a single
//display screen in real time. With enhanced GPUs on the market capable of stunning 3D
//graphics as a consequence of the video game industry, impressive motion, scaling,
//and lighting effects can be applied to normal 2D windows by the operating system.


//步骤1双击“控制面板”中的“显示”图标,或在桌面空白位置单击右键,选择“属性”,打开显示属性设置窗口。选择“设置”选项卡,并单击窗口中的“高级”按钮,打开高级属性设置窗口。
//步骤2 在高级属性设置窗口中选择“疑难解答”选项卡,拖动“硬件加速”滑块至“无”,单击“确定”退出。
//步骤3 在视频播放软件比如RealOne中拖拉滑杆至需要截取的画面,按PrintScreen键截取屏幕界面。
//步骤4 打开“开始”/“程序”/“附件”/“画图”,单击“编辑”/“粘贴”将截取后存储于剪贴板的屏幕截图粘贴到画图程序中,可以看到,已经可以成功截取视频图像,不过,较之启用硬件加速功能,此时的视频图像质量会有一定程度的损失

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