添加视频截图处理类。

GameAssist/GameAssist/CVideoCapture.cpp

@@ -0,0 +1,427 @@
+#include "stdafx.h"
+#include "CVideoCapture.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <windows.h>
+#include <process.h>
+#include <d3d11.h>
+#include <dxgi1_2.h>
+
+#pragma comment(lib, "d3d11")
+#pragma comment(lib, "dxgi")
+
+#ifndef _VIDEO_SOURCE_
+#define _VIDEO_SOURCE_
+typedef struct tDXGIVideoSource
+{
+	int		m_nLeft;//捕获区域坐标值-左
+	int		m_nTop;//捕获区域坐标值-上
+	int		m_nWidth;//捕获区域-宽度
+	int		m_nHeight;//捕获区域-高度
+
+	bool					m_bCaptureCursor;//是否抓取光标
+	bool					m_bActive;//是否激活，即是否获取到视频帧
+	HANDLE					m_hCaptureThread;//捕获线程句柄
+	HANDLE					m_hStopSignal;//线程停止信号
+
+	CRITICAL_SECTION		m_csMemLock;//数据访问互斥锁
+	void* m_memRawBuffer;//RGB数据存放缓冲区
+	int						m_nMemSize;//RGB数据缓冲区大小
+
+	ID3D11Device* m_hDevice;//设备对象
+	ID3D11DeviceContext* m_hContext;//设备上下文
+	IDXGIOutputDuplication* m_hDeskDupl;//桌面对象
+	DXGI_OUTPUT_DESC        m_dxgiOutDesc;//桌面对象描述-保存了桌面分辨率等信息
+
+	LPVideoDataRealCallback m_pVideoDataRealCalBack;//实时捕获数据回调函数
+	void* m_pVideoDataRealCalBackUser;//实时捕获数据用户接受对象
+}DXGIVideoSource, * LPDXGIVideoSource;
+#endif
+
+//申请一个视频源对象
+void DXGIAllocVideoResource(LPDXGIVideoSource* pSource);
+//释放视频源对象
+void DXGIReleaseVideoResource(LPDXGIVideoSource pSource);
+//开始捕获视频数据
+bool DXGIStartVideoCapture(LPDXGIVideoSource pSource);
+//停止捕获视频数据
+void DXGIStopVideoCapture(LPDXGIVideoSource pSource);
+//视频数据循环捕获线程
+DWORD WINAPI DXGIOnVideoCaptureThread(LPVOID param);
+//视频数据捕获函数
+bool DXGIDoVideoCapture(LPDXGIVideoSource pSource);
+//视频数据捕获函数
+bool DXGIProcessVideoCaptureData(LPDXGIVideoSource pSource);
+
+const IID IID_IDXGIDevice = { 0x54ec77fa, 0x1377, 0x44e6, { 0x8c, 0x32, 0x88, 0xfd, 0x5f, 0x44, 0xc8, 0x4c } };
+const IID IID_IDXGIAdapter = { 0x2411e7e1, 0x12ac, 0x4ccf, { 0xbd, 0x14, 0x97, 0x98, 0xe8, 0x53, 0x4d, 0xc0 } };
+const IID IID_IDXGIOutput1 = { 0x00cddea8, 0x939b, 0x4b83, { 0xa3, 0x40, 0xa6, 0x85, 0x22, 0x66, 0x66, 0xcc } };
+const IID IID_ID3D11Texture2D = { 0x6f15aaf2, 0xd208, 0x4e89, { 0x9a, 0xb4, 0x48, 0x95, 0x35, 0xd3, 0x4f, 0x9c } };
+const IID IID_IDXGISurface = { 0xcafcb56c, 0x6ac3, 0x4889, { 0xbf, 0x47, 0x9e, 0x23, 0xbb, 0xd2, 0x60, 0xec } };
+//#define RESET_OBJECT(A) {if (A) A->lpVtbl->Release(A); A = NULL;}
+#define RESET_OBJECT(A) {if (A) A->Release(); A = NULL;}
+
+//申请一个视频源对象
+void DXGIAllocVideoResource(LPDXGIVideoSource* ppSource)
+{
+	//参数初始化
+	*ppSource = (LPDXGIVideoSource)malloc(sizeof(DXGIVideoSource));
+	((LPDXGIVideoSource)*ppSource)->m_bActive = false;
+	((LPDXGIVideoSource)*ppSource)->m_bCaptureCursor = false;
+	((LPDXGIVideoSource)*ppSource)->m_hCaptureThread = NULL;
+	((LPDXGIVideoSource)*ppSource)->m_hStopSignal = CreateEvent(NULL, TRUE, FALSE, NULL);
+	((LPDXGIVideoSource)*ppSource)->m_memRawBuffer = NULL;
+	((LPDXGIVideoSource)*ppSource)->m_pVideoDataRealCalBack = NULL;
+	((LPDXGIVideoSource)*ppSource)->m_pVideoDataRealCalBackUser = NULL;
+	InitializeCriticalSection(&((LPDXGIVideoSource)*ppSource)->m_csMemLock);
+
+	HRESULT hr = S_OK;
+	//Direct3D驱动类型
+	D3D_DRIVER_TYPE DriverTypes[] =
+	{
+		D3D_DRIVER_TYPE_HARDWARE, //硬件驱动
+		D3D_DRIVER_TYPE_WARP,//软件驱动-性能高
+		D3D_DRIVER_TYPE_REFERENCE, //软件驱动-精度高，速度慢
+		D3D_DRIVER_TYPE_SOFTWARE,//软件驱动-性能低
+	};
+
+	UINT NumDriverTypes = ARRAYSIZE(DriverTypes);
+	D3D_FEATURE_LEVEL FeatureLevels[] =
+	{
+		D3D_FEATURE_LEVEL_11_0,
+		D3D_FEATURE_LEVEL_10_1,
+		D3D_FEATURE_LEVEL_10_0,
+		D3D_FEATURE_LEVEL_9_1
+	};
+
+	//初始化D3D设备-m_hDevice
+	UINT NumFeatureLevels = ARRAYSIZE(FeatureLevels);
+	D3D_FEATURE_LEVEL FeatureLevel;
+	for (UINT DriverTypeIndex = 0; DriverTypeIndex < NumDriverTypes; ++DriverTypeIndex)
+	{
+		hr = D3D11CreateDevice(NULL, DriverTypes[DriverTypeIndex], NULL, 0, FeatureLevels, NumFeatureLevels, D3D11_SDK_VERSION, &((LPDXGIVideoSource)*ppSource)->m_hDevice, &FeatureLevel, &((LPDXGIVideoSource)*ppSource)->m_hContext);
+		if (SUCCEEDED(hr))
+		{
+			break;
+		}
+	}
+
+	if (FAILED(hr))
+	{
+		goto exit;
+	}
+
+	IDXGIDevice* hDxgiDevice = NULL;
+	hr = ((LPDXGIVideoSource)*ppSource)->m_hDevice->QueryInterface(IID_IDXGIDevice/*__uuidof(IDXGIDevice)*/, (void**)(&hDxgiDevice));
+	if (FAILED(hr))
+	{
+		goto exit;
+	}
+
+	//获取桌面对象描述符-m_dxgiOutDesc，主要是获取桌面分辨率大小
+	IDXGIAdapter* hDxgiAdapter = NULL;
+	hr = hDxgiDevice->GetParent(IID_IDXGIAdapter, (void**)(&hDxgiAdapter));
+	RESET_OBJECT(hDxgiDevice);
+	if (FAILED(hr))
+	{
+		goto exit;
+	}
+
+	INT nOutput = 0;
+	IDXGIOutput* hDxgiOutput = NULL;
+	hr = hDxgiAdapter->EnumOutputs(nOutput, &hDxgiOutput);
+	RESET_OBJECT(hDxgiAdapter);
+	if (FAILED(hr))
+	{
+		goto exit;
+	}
+
+	hDxgiOutput->GetDesc(&((LPDXGIVideoSource)*ppSource)->m_dxgiOutDesc);
+
+	IDXGIOutput1* hDxgiOutput1 = NULL;
+	hr = hDxgiOutput->QueryInterface(IID_IDXGIOutput1, (void**)(&hDxgiOutput1));
+	RESET_OBJECT(hDxgiOutput);
+	if (FAILED(hr))
+	{
+		goto exit;
+	}
+
+	hr = hDxgiOutput1->DuplicateOutput((IUnknown*)((LPDXGIVideoSource)*ppSource)->m_hDevice, (IDXGIOutputDuplication**)&((LPDXGIVideoSource)*ppSource)->m_hDeskDupl);
+	RESET_OBJECT(hDxgiOutput1);
+	if (FAILED(hr))
+	{
+		goto exit;
+	}
+
+	return;
+exit:
+	DXGIReleaseVideoResource((LPDXGIVideoSource)*ppSource);
+	*ppSource = NULL;
+}
+
+//释放视频源对象
+void DXGIReleaseVideoResource(LPDXGIVideoSource pSource)
+{
+	RESET_OBJECT(pSource->m_hDeskDupl);
+	RESET_OBJECT(pSource->m_hContext);
+	RESET_OBJECT(pSource->m_hDevice);
+	free(((LPDXGIVideoSource)pSource)->m_memRawBuffer);
+	((LPDXGIVideoSource)pSource)->m_memRawBuffer = NULL;
+	DeleteCriticalSection(&((LPDXGIVideoSource)pSource)->m_csMemLock);
+	free(pSource);
+	pSource = NULL;
+}
+
+//开始捕获视频数据
+bool DXGIStartVideoCapture(LPDXGIVideoSource pSource)
+{
+	// 释放之前申请的的存放图像的缓存
+	free(((LPDXGIVideoSource)pSource)->m_memRawBuffer);
+	((LPDXGIVideoSource)pSource)->m_memRawBuffer = NULL;
+	((LPDXGIVideoSource)pSource)->m_nMemSize = 0;
+
+	//计算所需存放图像的缓存大小
+	((LPDXGIVideoSource)pSource)->m_nMemSize = pSource->m_nWidth * pSource->m_nHeight * 4;//获取的图像位图深度32位，所以是*4
+	((LPDXGIVideoSource)pSource)->m_memRawBuffer = (char*)malloc(((LPDXGIVideoSource)pSource)->m_nMemSize);
+	memset(((LPDXGIVideoSource)pSource)->m_memRawBuffer, 0, ((LPDXGIVideoSource)pSource)->m_nMemSize);
+
+	//创建捕获图像的线程
+	unsigned int dwThreadId;
+	pSource->m_hCaptureThread = (HANDLE)_beginthreadex(NULL,
+		0,
+		(_beginthreadex_proc_type)&DXGIOnVideoCaptureThread,
+		pSource,
+		THREAD_PRIORITY_NORMAL,
+		&dwThreadId);
+	if (!pSource->m_hCaptureThread)
+		return false;
+
+	return true;
+}
+
+//停止捕获视频数据
+void DXGIStopVideoCapture(LPDXGIVideoSource pSource)
+{
+	//发送线程停止工作信号
+	SetEvent(pSource->m_hStopSignal);
+	//等待线程安全退出
+	if (pSource->m_bActive)
+	{
+		WaitForSingleObject(pSource->m_hCaptureThread, INFINITE);
+	}
+
+	pSource->m_nMemSize = 0;
+}
+
+//视频数据循环捕获线程
+DWORD WINAPI DXGIOnVideoCaptureThread(LPVOID param)
+{
+	LPDXGIVideoSource pSource = (LPDXGIVideoSource)param;
+	DXGIDoVideoCapture(pSource);
+	_endthreadex(0);
+	return 0;
+}
+
+//视频数据循环捕获线程-处理线程
+bool DXGIDoVideoCapture(LPDXGIVideoSource pSource)
+{
+	DWORD        dwTimeout = 1;
+	DWORD dwStartTickCount = GetTickCount();
+
+	// 等待超时进入下一次图像数据获取
+	while (WaitForSingleObject(pSource->m_hStopSignal, dwTimeout) == WAIT_TIMEOUT)
+	{
+		if (DXGIProcessVideoCaptureData(pSource))
+		{
+			if (((LPDXGIVideoSource)pSource)->m_bActive)
+			{
+				//获取图像成功，回调数据给应用层用户处理
+				if (pSource->m_pVideoDataRealCalBack)
+				{
+					pSource->m_pVideoDataRealCalBack((LPBYTE)pSource->m_memRawBuffer, pSource->m_nMemSize, pSource->m_nWidth, pSource->m_nHeight, pSource->m_pVideoDataRealCalBackUser);
+				}
+			}
+			else
+			{
+				// 因为第一帧是黑屏。需要忽略，具体原因？？？
+				((LPDXGIVideoSource)pSource)->m_bActive = true;
+			}
+		}
+	}
+
+	//关闭信号
+	CloseHandle(pSource->m_hStopSignal);
+	pSource->m_hStopSignal = NULL;
+	//关闭线程句柄
+	CloseHandle(pSource->m_hCaptureThread);
+	pSource->m_hCaptureThread = NULL;
+	((LPDXGIVideoSource)pSource)->m_bActive = false;
+	return true;
+}
+
+//
+//将桌面挂到这个进程中
+//
+bool AttatchToThread(VOID)
+{
+	HDESK hOldDesktop = GetThreadDesktop(GetCurrentThreadId());
+	HDESK hCurrentDesktop = OpenInputDesktop(0, FALSE, GENERIC_ALL);
+	if (!hCurrentDesktop)
+	{
+		return false;
+	}
+
+	bool bDesktopAttached = SetThreadDesktop(hCurrentDesktop);
+	CloseDesktop(hOldDesktop);
+	CloseDesktop(hCurrentDesktop);
+	hCurrentDesktop = NULL;
+
+	return bDesktopAttached;
+}
+
+//视频数据捕获函数
+bool DXGIProcessVideoCaptureData(LPDXGIVideoSource pSource)
+{
+	//将桌面挂到这个进程中
+	if (!AttatchToThread())
+	{
+		return false;
+	}
+
+	///截取屏幕数据
+	IDXGIResource* hDesktopResource = NULL;
+	DXGI_OUTDUPL_FRAME_INFO FrameInfo;
+	HRESULT hr = pSource->m_hDeskDupl->AcquireNextFrame(500, &FrameInfo, &hDesktopResource);
+	if (FAILED(hr))
+	{
+		//
+		// 在一些win10的系统上,如果桌面没有变化的情况下，
+		// 这里会发生超时现象，但是这并不是发生了错误，而是系统优化了刷新动作导致的。
+		// 所以，这里没必要返回FALSE，返回不带任何数据的TRUE即可
+		//
+		return true;
+	}
+
+	//获取纹理2D
+	ID3D11Texture2D* hAcquiredDesktopImage = NULL;
+	hr = hDesktopResource->QueryInterface(IID_ID3D11Texture2D, (void**)(&hAcquiredDesktopImage));
+	RESET_OBJECT(hDesktopResource);
+	if (FAILED(hr))
+	{
+		return false;
+	}
+
+	D3D11_TEXTURE2D_DESC frameDescriptor;
+	hAcquiredDesktopImage->GetDesc(&frameDescriptor);
+
+	//创建一个新的2D纹理对象,用于把 hAcquiredDesktopImage的数据copy进去
+	ID3D11Texture2D* hNewDesktopImage = NULL;
+	frameDescriptor.Usage = D3D11_USAGE_STAGING;
+	frameDescriptor.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
+	frameDescriptor.BindFlags = 0;
+	frameDescriptor.MiscFlags = 0;
+	frameDescriptor.MipLevels = 1;
+	frameDescriptor.ArraySize = 1;
+	frameDescriptor.SampleDesc.Count = 1;
+	hr = pSource->m_hDevice->CreateTexture2D( &frameDescriptor, NULL, &hNewDesktopImage);
+	if (FAILED(hr))
+	{
+		RESET_OBJECT(hAcquiredDesktopImage);
+		pSource->m_hDeskDupl->ReleaseFrame();
+		return false;
+	}
+
+	///获取整个帧的数据 
+	pSource->m_hContext->CopyResource((ID3D11Resource*)hNewDesktopImage, (ID3D11Resource*)hAcquiredDesktopImage);
+	RESET_OBJECT(hAcquiredDesktopImage);
+	pSource->m_hDeskDupl->ReleaseFrame();
+
+	// 获取这个2D纹理对象的表面
+	IDXGISurface* hStagingSurf = NULL;
+	hr = hNewDesktopImage->QueryInterface(IID_IDXGISurface, (void**)(&hStagingSurf));
+	RESET_OBJECT(hNewDesktopImage);
+	if (FAILED(hr))
+	{
+		return false;
+	}
+
+	//映射锁定表面,从而获取表面的数据地址
+	//这个时候 mappedRect.pBits 指向的内存就是原始的图像数据, 因为DXGI固定为 32位深度色
+	//mappedRect.pBits 指向的就是 BGRA 元数组
+	DXGI_MAPPED_RECT mappedRect;
+	hr = hStagingSurf->Map( &mappedRect, DXGI_MAP_READ);
+	if (SUCCEEDED(hr))
+	{
+		WORD bitsPerPixel = 4;	// 每个像素点数据占4个字节 - RGBA
+		int iWidth = pSource->m_dxgiOutDesc.DesktopCoordinates.right - pSource->m_dxgiOutDesc.DesktopCoordinates.left;
+		int iHeight = pSource->m_dxgiOutDesc.DesktopCoordinates.bottom - pSource->m_dxgiOutDesc.DesktopCoordinates.top;
+		int iCopyDataLength = (pSource->m_nWidth * 32 + 31) / 32 * bitsPerPixel;
+		int j = 0;
+		for (int h = pSource->m_nTop; h < pSource->m_nTop + pSource->m_nHeight; h++)
+		{
+			int iSrcOffset = (h * iWidth + pSource->m_nLeft) * bitsPerPixel;
+			BYTE* pSrc = mappedRect.pBits + iSrcOffset;
+			int iDesOffset = (pSource->m_nWidth * 32 + 31) / 32 * j * bitsPerPixel;
+			BYTE* pDes = (BYTE*)pSource->m_memRawBuffer + iDesOffset;
+			memcpy(pDes, pSrc, iCopyDataLength);
+			j++;
+		}
+
+		hStagingSurf->Unmap();
+	}
+
+	RESET_OBJECT(hStagingSurf);
+	return SUCCEEDED(hr);
+}
+
+//设置图像数据回调函数
+void DXGISetVideoCaptureDataRealCallback(LPDXGIVideoSource pSource, LPVideoDataRealCallback pVideoDataRealCalBack, void* pUser)
+{
+	pSource->m_pVideoDataRealCalBack = pVideoDataRealCalBack;
+	pSource->m_pVideoDataRealCalBackUser = pUser;
+}
+
+
+// DXGI方式，设置视频回调函数，并开始捕获视频数据
+void* DXGI_VideoSourceStartCapture(int left, int top, int width, int height, LPVideoDataRealCallback pCallback, void* pUser)
+{
+	// 申请一个视频数据源
+	LPDXGIVideoSource pSource = NULL;
+	DXGIAllocVideoResource(&pSource);
+
+	//保存捕获区域参数
+	printf("录制区域left=%d,top=%d,w=%d,h=%d\n", left, top, width, height);
+	pSource->m_nLeft = left;
+	pSource->m_nTop = top;
+	pSource->m_nWidth = width;
+	pSource->m_nHeight = height;
+
+	//设置图像数据回调函数
+	DXGISetVideoCaptureDataRealCallback(pSource, pCallback, pUser);
+	if (pSource && DXGIStartVideoCapture(pSource))
+	{
+		return pSource;
+	}
+	else
+	{
+		goto exit;
+	}
+
+exit:
+	//释放，释放所有资源
+	DXGIReleaseVideoResource(pSource);
+	pSource = NULL;
+	return pSource;
+}
+
+// 停止视频数据捕获
+bool DXGI_VideoSourceStopCapture(void* pSource)
+{
+	if (pSource == NULL)
+		return true;
+
+	DXGISetVideoCaptureDataRealCallback((LPDXGIVideoSource)pSource, NULL, NULL);
+	DXGIStopVideoCapture((LPDXGIVideoSource)pSource);
+	return true;
+}

GameAssist/GameAssist/CVideoCapture.h

@@ -0,0 +1,21 @@
+#pragma once
+
+//#define CINTERFACE 
+/*
+在c＋＋中以c的方式使用接口时，应当：i->lpVtbl->....，
+但是编译器可能会提示lpVtbl不是相应com接口的成员。
+这是因为在com头文件中有两种定义方式，即c和c＋＋；这两种方式通过 __cplusplus和CINTERFACE来区分。
+*/
+
+#ifndef _VIDEODATA_CALLBACK_
+#define _VIDEODATA_CALLBACK_
+typedef void(*LPVideoDataRealCallback)(unsigned char* pRgbData, int size, int width, int height, void* pContext);
+#endif
+
+// DXGI方式，设置视频回调函数，并开始捕获视频数据
+void* DXGI_VideoSourceStartCapture(int left, int top, int width, int height, LPVideoDataRealCallback pCallback, void* pUser);
+// 停止视频数据捕获
+bool DXGI_VideoSourceStopCapture(void* pSource);
+
+
+

GameAssist/GameAssist/GameAssist.vcxproj

@@ -113,6 +113,7 @@
   </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="Assist.cpp" />
+    <ClCompile Include="CVideoCapture.cpp" />
     <ClCompile Include="GameAssist.cpp" />
     <ClCompile Include="GameAssistDlg.cpp" />
     <ClCompile Include="stdafx.cpp">
@@ -122,6 +123,7 @@
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="Assist.h" />
+    <ClInclude Include="CVideoCapture.h" />
     <ClInclude Include="GameAssist.h" />
     <ClInclude Include="GameAssistDlg.h" />
     <ClInclude Include="Resource.h" />

GameAssist/GameAssist/GameAssist.vcxproj.filters

@@ -27,6 +27,9 @@
     <ClCompile Include="stdafx.cpp">
       <Filter>源文件</Filter>
     </ClCompile>
+    <ClCompile Include="CVideoCapture.cpp">
+      <Filter>源文件</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="Assist.h">
@@ -47,6 +50,9 @@
     <ClInclude Include="targetver.h">
       <Filter>头文件</Filter>
     </ClInclude>
+    <ClInclude Include="CVideoCapture.h">
+      <Filter>头文件</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <None Include="Assist.ini">

GameAssist/GameAssist/GameAssistDlg.cpp

@@ -303,94 +303,6 @@ void CGameAssistDlg::OnBnClickedOpengame()
 void CGameAssistDlg::OnBnClickedButton2()
 {
 	// TODO: 在此添加控件通知处理程序代码
-	 //创建DirectDraw
-	if (FAILED(DirectDrawCreate(NULL, &ddraw1, NULL)))
-	{
-		TRACE(/ "Couldn/'t create DirectDraw object.//n/");
-	}
-	if (FAILED(ddraw1->QueryInterface(IID_IDirectDraw2, (LPVOID*)&ddraw2)))
-	{
-		TRACE(/ "Couldn/'t query the interface.//n/");
-	}
-	if (ddraw2)
-	{
-		ddraw2->SetCooperativeLevel(GetSafeHwnd(), DDSCL_NORMAL);
-	}
-	if (ddraw1)
-	{
-		ddraw1->Release();
-		ddraw1 = NULL;
-	}
-
-	//创建主表面
-	HRESULT r;
-
-	DDSURFACEDESC desc;
-	desc.dwSize = sizeof(desc);
-	desc.dwFlags = DDSD_CAPS;
-	desc.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE;
-	r = ddraw2->CreateSurface(&desc, &primsurf, 0);
-	if (r != DD_OK)
-	{
-		AfxMessageBox(/ "Create DirectX Surface failed//n /");
-		PostMessage(WM_CLOSE);
-	}
-	r = ddraw2->CreateClipper(0, &clipper, 0);
-	if (r != DD_OK)
-	{
-		AfxMessageBox(/ "CreateClipper() fialed//n /");
-		PostMessage(WM_CLOSE);
-	}
-	r = clipper->SetHWnd(0, GetSafeHwnd());
-	if (r != DD_OK)
-	{
-		AfxMessageBox(/ "SetHWnd() failed//n /");
-		PostMessage(WM_CLOSE);
-	}
-	r = primsurf->SetClipper(clipper);
-	if (r != DD_OK)
-	{
-		AfxMessageBox(/ "SetClipper() fialed//n /");
-		PostMessage(WM_CLOSE);
-	}
-
-	//创建后台表面
-	ZeroMemory(&desc, sizeof(desc));
-	desc.dwSize = sizeof(desc);
-	desc.dwFlags = DDSD_WIDTH | DDSD_HEIGHT | DDSD_CAPS;
-	desc.dwWidth = ::GetSystemMetrics(SM_CXSCREEN);
-	desc.dwHeight = ::GetSystemMetrics(SM_CYSCREEN);
-	desc.ddsCaps.dwCaps = DDSCAPS_SYSTEMMEMORY | DDSCAPS_OFFSCREENPLAIN;
-
-	r = ddraw2->CreateSurface(&desc, &backsurf, 0);
-	//收集图象参数
-	DDSURFACEDESC ddsd;
-
-	ZeroMemory(&ddsd, sizeof(ddsd));
-	ddsd.dwSize = sizeof(ddsd);
-	backsurf->GetSurfaceDesc(&ddsd);
-	BitCount = ddsd.ddpfPixelFormat.dwRGBBitCount;
-	lPitch = ddsd.lPitch;
-	dwWidth = ddsd.dwWidth;
-	dwHeight = ddsd.dwHeight;
-	dwRBitMask = ddsd.ddpfPixelFormat.dwRBitMask;
-	dwGBitMask = ddsd.ddpfPixelFormat.dwGBitMask;
-	dwBBitMask = ddsd.ddpfPixelFormat.dwBBitMask;
-	//确定16Bit色时的修正（16Bit色时有两种显示格式565和555）
-	RMove = 8;//这里先假定为565格式
-	GMove = 3;
-	BMove = 3;
-	if (BitCount == 16)
-	{
-		if (dwGBitMask == 992)
-		{
-			//555格式
-			RMove = 7;
-			GMove = 2;
-		}
-		if (dwGBitMask == 1984)
-			//555格式
-			BMove = 2;
-	}
+	
 
 }