【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。

原文
http://hi.baidu.com/widebright/blog/item/6b3a233f97147eea54e7233f.html
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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。
9 G  E/ t; C  j- M, Z" }" t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
$ O  g4 Z) f9 R* v& K7 H#include <d3d9.h>
#include <d3dx9.h>
6 f0 ~9 e, b; u  G#pragma comment( lib, "d3d9.lib" )
6 k; ^9 Y2 O( w$ a. u. b#pragma comment( lib, "d3dx9.lib" )
+ f& T0 C2 u+ s" S0 \
5 v2 @5 l, C+ ?9 U, [int Capture ()
, [/ e  a3 l2 r2 \! P9 L. ?: a5 q{
LPDIRECT3D9 g_pD3D = NULL;
& m- X( |1 ^3 X1 A4 ^$ K7 Z' L! G8 pD3DDISPLAYMODE ddm;
+ w( W' q2 k6 t5 k! eD3DPRESENT_PARAMETERS d3dpp;

: U! p' R: ?  B/ [) vIDirect3DDevice9 * g_pd3dDevice;
' }" x2 M7 R8 F- Z1 g* |$ z8 qIDirect3DSurface9 * pSurface;

$ V& }6 p/ t/ ]( K. w0 QZeroMemory(&d3dpp,sizeof(D3DPRESENT_PARAMETERS));
ZeroMemory( &d3dpp, sizeof(d3dpp) );
8 @& H0 }8 b* k
! p$ D( u* t3 r* K
8 ]" q9 p7 ~( m: y& I- Uif((g_pD3D=Direct3DCreate9(D3D_SDK_VERSION))==NULL)
: q0 e, e  ?. ^: `8 h. p{
$ |. k0 R6 J1 _return 1;
% G, E0 _3 q' ~% n1 z) g# B- g}
) k& I+ e* j- F: [2 dif(FAILED(g_pD3D->GetAdapterDisplayMode(D3DADAPTER_DEFAULT,&ddm)))
' n, q3 L2 i1 `$ H; M& G{
return 1;
/ m& C% M3 C% {" n! \! F0 p}

1 T- F1 h7 `9 k3 [d3dpp.Windowed=TRUE;
d3dpp.Flags=D3DPRESENTFLAG_LOCKABLE_BACKBUFFER;
6 W! m( f1 `5 b4 s6 }0 td3dpp.BackBufferFormat=ddm.Format;
# l- C, s. o" Xd3dpp.BackBufferHeight=ddm.Height;
d3dpp.BackBufferWidth=ddm.Width;
8 ^! d8 w* Y, |. B, K+ rd3dpp.MultiSampleType=D3DMULTISAMPLE_NONE;
+ w, Q& Y- q. m8 r0 f; M7 R3 I: ed3dpp.SwapEffect=D3DSWAPEFFECT_DISCARD;
d3dpp.hDeviceWindow=GetDesktopWindow();
) u7 C, r0 u" k7 ]; J6 Z  fd3dpp.PresentationInterval=D3DPRESENT_INTERVAL_DEFAULT;
0 N( \7 v3 ?- S6 gd3dpp.FullScreen_RefreshRateInHz=D3DPRESENT_RATE_DEFAULT;

% Y8 n; C; L) K* q
if(FAILED(g_pD3D->CreateDevice(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,GetDesktopWindow(),D3DCREATE_SOFTWARE_VERTEXPROCESSING ,&d3dpp,&g_pd3dDevice)))
{
return 1;
+ m, a. `  T$ I' o  D}

! `- t! n7 Z3 D8 |if(FAILED(g_pd3dDevice->CreateOffscreenPlainSurface(ddm.Width, ddm.Height, D3DFMT_A8R8G8B8, D3DPOOL_SCRATCH, &pSurface, NULL)))
{
return 1;
4 t; h7 \+ i1 J0 E/ `9 t}

g_pd3dDevice->CreateOffscreenPlainSurface(1024, 768,
D3DFMT_A8R8G8B8, D3DPOOL_SCRATCH, &pSurface, NULL);
3 V" P5 z- H# q/ c3 Rg_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
$ m# o3 R. y* Z8 z# @D3DXSaveSurfaceToFile("Desktop.bmp",D3DXIFF_BMP,pSurface,NULL,NULL);//保存为 bmp格式
pSurface->Release();
! C; z' C" C& }+ R9 v4 Xg_pd3dDevice->Release ();
6 ?* D2 s, x1 x7 D" Mg_pD3D->Release ();

" w3 ~  `0 l* Ereturn 0;
+ |" ^  T$ z; o. W1 ?
}

! K. t* r$ S$ y3 H//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），
8 u5 e+ z  t- \//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。

  @1 f/ x. e/ N  {% s//下面是些参考资料：
# E7 m; v9 J4 q3 o//Video Renderer (VR)是接收RGB/YUV裸数据，然后在显示器上显示的Filter。
7 C2 o% N5 T# X/ S//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；
6 W7 E2 `+ k! t3 V//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），
. n; X% c7 a8 K6 h' [0 W+ S//可以这么说，VMR是Windows平台上新一代的Video Renderer。
3 A' @9 x  c+ w! X1 f; }4 r
% h6 o' ?4 o( ]6 Q4 B; A0 u//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
% G" x5 x: Q) x+ q2 T
//
//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)
$ b. Y1 X: Z# ^6 Y//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
  ^# t! O$ x3 X//overlays - it simply captures the shared main screen as rendered by the software's graphical
$ j7 ~  [2 @1 P; k//subsystem. Some Digital Rights Management schemes use hardware overlay to display
* W  `  }7 ]; d" a//protected content on the screen, taking advantage of this quirk to prevent the copying of
" U! Z! o( c  V7 b//protected documents by way of screen capture[citation needed]. Disabling the support for
% R- [  N6 {1 c  _+ C//overlays causes the normally overlay using software to fallback to the shared memory,
//enabling screenshots.
/ k2 P9 ^7 ]0 Y9 l, X4 T% [! ]: f
7 j6 S. ~! N2 a0 t//Starting with Windows Vista's enhanced graphics capabilities, the basic concept
* d! b0 W6 b3 r//of hardware overlays is replaced by full hardware compositing for every application window
! ]6 x9 L) f) p# G) n//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
& ^5 J+ X9 l  {, ~/ h# d//a Direct3D surface). Then, the system's GPU assembles each of the windows into a single
0 Q) t2 M8 I; O' h, C. j/ j, }//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。
//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