【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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2 U6 d! n4 S4 x1 }2 m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
7 F! r' T5 j/ ^$ U& f#include <d3d9.h>
! L4 S9 r: q3 `3 w, N#include <d3dx9.h>
5 b: d3 u% }1 `#pragma comment( lib, "d3d9.lib" )
8 M) `* K; d5 Q2 [& v2 N#pragma comment( lib, "d3dx9.lib" )

/ n. S% i( A) U1 d' Hint Capture ()
) @% d+ s6 R4 w  |5 J{
" E! n; S; f0 T1 rLPDIRECT3D9 g_pD3D = NULL;
D3DDISPLAYMODE ddm;
D3DPRESENT_PARAMETERS d3dpp;
5 z7 P# P/ o& [" t' _
( i% X0 N  `3 WIDirect3DDevice9 * g_pd3dDevice;
IDirect3DSurface9 * pSurface;
' j- s- k8 d) j& D7 j
ZeroMemory(&d3dpp,sizeof(D3DPRESENT_PARAMETERS));
ZeroMemory( &d3dpp, sizeof(d3dpp) );


8 b. l1 Y) ]; _2 g( Pif((g_pD3D=Direct3DCreate9(D3D_SDK_VERSION))==NULL)
8 l+ \6 L6 S- R. H# _9 X{
  h# p$ u4 M* q. T' Ereturn 1;
}
2 Z0 @0 S  ?# v' z2 F, sif(FAILED(g_pD3D->GetAdapterDisplayMode(D3DADAPTER_DEFAULT,&ddm)))
{
) u4 ?: K1 u6 `; x9 J9 ?return 1;
- e/ o, a" [% p: u$ t}
7 G- D; x+ \" z  J0 d, g" N1 I
' a4 N4 f( X) f# \8 B6 d3 i; Nd3dpp.Windowed=TRUE;
d3dpp.Flags=D3DPRESENTFLAG_LOCKABLE_BACKBUFFER;
: |( Q* v0 `% ~/ c5 w4 N8 s% o0 od3dpp.BackBufferFormat=ddm.Format;
d3dpp.BackBufferHeight=ddm.Height;
$ N4 A3 a) J! B# `+ bd3dpp.BackBufferWidth=ddm.Width;
" j4 |3 b2 Y& d6 @) Xd3dpp.MultiSampleType=D3DMULTISAMPLE_NONE;
) s$ Z3 O. ^7 B0 l8 P3 D, g7 Vd3dpp.SwapEffect=D3DSWAPEFFECT_DISCARD;
d3dpp.hDeviceWindow=GetDesktopWindow();
d3dpp.PresentationInterval=D3DPRESENT_INTERVAL_DEFAULT;
d3dpp.FullScreen_RefreshRateInHz=D3DPRESENT_RATE_DEFAULT;

- f3 S% E- {7 r
) q6 z; L# Q- z" I8 Jif(FAILED(g_pD3D->CreateDevice(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,GetDesktopWindow(),D3DCREATE_SOFTWARE_VERTEXPROCESSING ,&d3dpp,&g_pd3dDevice)))
{
5 A9 z0 R! v, q! |, m( hreturn 1;
}
% D8 Z" ~$ y7 i2 J; _2 I* X7 }
! a/ S0 {* a- R+ aif(FAILED(g_pd3dDevice->CreateOffscreenPlainSurface(ddm.Width, ddm.Height, D3DFMT_A8R8G8B8, D3DPOOL_SCRATCH, &pSurface, NULL)))
2 v1 _% n3 K; }! |9 p3 G) q{
return 1;
}

g_pd3dDevice->CreateOffscreenPlainSurface(1024, 768,
2 B% W( p1 m5 I& @0 T& w! WD3DFMT_A8R8G8B8, D3DPOOL_SCRATCH, &pSurface, NULL);
0 v4 |% r) {+ ], B3 q  eg_pd3dDevice->GetFrontBufferData(0, pSurface);
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D3DXSaveSurfaceToFile("Desktop.png",D3DXIFF_PNG,pSurface,NULL,NULL);//s保存为png格式
/ E/ E; D$ c4 x/ K% M3 F- @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();
9 H, T$ L- I. M2 l0 j- r( ^g_pd3dDevice->Release ();
, U3 W1 H% h4 B$ d, u6 m  m) c' Sg_pD3D->Release ();

+ m2 v/ p) V9 @+ ereturn 0;
7 V) Y/ ?- S. F  V, s/ E9 v
}

//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），
7 g; n! j* R, v2 _9 c4 c//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
7 }& B6 ~1 t1 k$ I  D//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
% r, d& K9 D5 k) b. O//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。
, l+ i. O2 w+ N/ s. p; j
//下面是些参考资料：
, m/ F+ }6 X  K$ w5 ~//Video Renderer (VR)是接收RGB/YUV裸数据，然后在显示器上显示的Filter。
" G, y7 q. s; [* P  ^//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。

) x7 L# _& K) }9 @//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
, ~( j, o( f1 k: t! U0 \
//
//One consequence of hardware overlay use is that a screenshot program (for example,
5 x1 t' i5 a% q//the one automatically built into Windows that activates when the PrtSc key is pressed)
  V# C7 Y8 W# H0 f9 e! F//often does not capture the content appearing in the hardware overlay window. Rather,
) f) x. K' J' O" f$ j7 i2 B* c//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
) a+ V( _0 i2 f//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
; I$ _$ X0 U* O//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,
$ f  {& g/ p( r+ @//enabling screenshots.
! i3 }& D( E8 @4 h
/ m6 E. q1 K5 _, |//Starting with Windows Vista's enhanced graphics capabilities, the basic concept
0 T2 n4 p) ]/ D3 P3 T//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
$ u. ^' _. z/ Q! e' v//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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: U0 r) X) W, x& a
//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