【代理DLL汉化研究】DirectX3D9 技术实现的抓屏

shane007

在Hook代码中的，我们也许要对前台surface,后台surface的内容进行判断和保存，以下代码可以作为参考。
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原文
. d, \* C, @" ^8 z( khttp://hi.baidu.com/widebright/blog/item/6b3a233f97147eea54e7233f.html

7 ^) c+ n3 e4 y% F7 F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" )
( ^2 ?* Q* a3 z4 ?; V# p#pragma comment( lib, "d3dx9.lib" )

: {+ O# k1 }) l* yint Capture ()
{
. f9 F* l6 l. b+ M! o8 s5 GLPDIRECT3D9 g_pD3D = NULL;
& H4 k$ ?: `4 h. K8 ^, I. @$ uD3DDISPLAYMODE ddm;
D3DPRESENT_PARAMETERS d3dpp;

: y+ Y9 a  a: Y2 ^& MIDirect3DDevice9 * g_pd3dDevice;
# @( J: E/ ]1 c8 rIDirect3DSurface9 * pSurface;

7 U" @' g7 ~, mZeroMemory(&d3dpp,sizeof(D3DPRESENT_PARAMETERS));
ZeroMemory( &d3dpp, sizeof(d3dpp) );
% g0 [9 D1 C; f: W9 h
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# v/ ^+ n4 v% a5 {, T- jif((g_pD3D=Direct3DCreate9(D3D_SDK_VERSION))==NULL)
  {( N" w6 L) ^  Y4 s) g, W( f5 u: x{
return 1;
}
if(FAILED(g_pD3D->GetAdapterDisplayMode(D3DADAPTER_DEFAULT,&ddm)))
{
; A8 v1 a# ]- i. ireturn 1;
$ k7 m) E+ g* b$ U}

- M8 S" j7 a0 k" jd3dpp.Windowed=TRUE;
d3dpp.Flags=D3DPRESENTFLAG_LOCKABLE_BACKBUFFER;
9 Z) I. w7 V9 }  x3 Bd3dpp.BackBufferFormat=ddm.Format;
5 e5 z& O3 z$ T- p, s! c0 a/ E$ i5 cd3dpp.BackBufferHeight=ddm.Height;
d3dpp.BackBufferWidth=ddm.Width;
d3dpp.MultiSampleType=D3DMULTISAMPLE_NONE;
, X9 {7 Y: [, v0 p' C' R  Ad3dpp.SwapEffect=D3DSWAPEFFECT_DISCARD;
d3dpp.hDeviceWindow=GetDesktopWindow();
+ w! |2 ^' K( h$ `: t  Xd3dpp.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)))
, d1 F7 m8 D3 s* P& `) i* B. M{
return 1;
}
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6 ?4 ~; |, H# t& k0 U6 Dif(FAILED(g_pd3dDevice->CreateOffscreenPlainSurface(ddm.Width, ddm.Height, D3DFMT_A8R8G8B8, D3DPOOL_SCRATCH, &pSurface, NULL)))
5 M, K2 q! I8 M. L% k{
return 1;
" d) O; A- _  U5 e1 S# G% O}

; m* S* [8 b& y6 ?5 |% rg_pd3dDevice->CreateOffscreenPlainSurface(1024, 768,
8 H$ i& c5 l- m+ K% M+ nD3DFMT_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
- Y7 s: `% o8 DD3DXSaveSurfaceToFile("Desktop.bmp",D3DXIFF_BMP,pSurface,NULL,NULL);//保存为 bmp格式
. T0 u6 \' }: F3 g" D. R- HpSurface->Release();
g_pd3dDevice->Release ();
& N; Y$ b0 Q- ~; g6 lg_pD3D->Release ();
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return 0;
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//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），
; P. j+ y2 u( {3 O, ?! g//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。
) w  w  N, ]9 T$ @
* I6 U: t7 f; K( W# z8 |( z' l! b//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），
( W6 j# A, v! M5 \//可以这么说，VMR是Windows平台上新一代的Video Renderer。
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. \9 F+ _& z! m9 ~. g: {//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

8 X& t/ ?0 |# Q6 ?//
//One consequence of hardware overlay use is that a screenshot program (for example,
% [' Q5 X6 f/ n4 n; h//the one automatically built into Windows that activates when the PrtSc key is pressed)
- N3 k* n$ y* X//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
! m4 ]; o7 I; D. `3 U" ^//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.
' D/ ~+ `' w9 v7 \1 n( R
& y, S( _9 L4 S6 u0 t6 }//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.
2 N7 e* d; |* Z: F( S* J//Mac OS X has been using hardware compositing since Quartz Extreme was introduced in Mac OS X 10.2.
* u" ~3 {. i3 |+ s$ C9 n6 O4 O//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
- l& d0 a6 B+ V5 V% G) \+ |5 N3 q6 j//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.

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//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。
4 w& E) g# p, u: t; Q//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。
" b! j3 f" f: p8 R3 m- w6 }6 q3 V( T" j//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