透明效果图

// a3.cpp : Defines the entry point for the application.//#include "stdafx.h"#include "resource.h"#define MAX_LOADSTRING 100// Global Variables:HINSTANCE hInst;HBITMAP bg,bmp,girl;HDC mdc,hdc;const int xstart=180;const int ystart=70;// current instanceTCHAR szTitle[MAX_LOADSTRING];// The title bar textTCHAR szWindowClass[MAX_LOADSTRING];// The title bar text// Foward declarations of functions included in this code module:ATOMMyRegisterClass(HINSTANCE hInstance);BOOLInitInstance(HINSTANCE, int);LRESULT CALLBACKWndProc(HWND, UINT, WPARAM, LPARAM);LRESULT CALLBACKAbout(HWND, UINT, WPARAM, LPARAM);void MyPaint(HDC hdc);int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow){ // TODO: Place code here.MSG msg;HACCEL hAccelTable;// Initialize global stringsLoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);LoadString(hInstance, IDC_A3, szWindowClass, MAX_LOADSTRING);MyRegisterClass(hInstance);// Perform application initialization:if (!InitInstance (hInstance, nCmdShow)) {return FALSE;}hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_A3);// Main message loop:while (GetMessage(&msg, NULL, 0, 0)) {if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg)) {TranslateMessage(&msg);DispatchMessage(&msg);}}return msg.wParam;}//// FUNCTION: MyRegisterClass()//// PURPOSE: Registers the window class.//// COMMENTS://// This function and its usage is only necessary if you want this code// to be compatible with Win32 systems prior to the 'RegisterClassEx'// function that was added to Windows 95. It is important to call this function// so that the application will get 'well formed' small icons associated// with it.//ATOM MyRegisterClass(HINSTANCE hInstance){WNDCLASSEX wcex;wcex.cbSize = sizeof(WNDCLASSEX); wcex.style= CS_HREDRAW | CS_VREDRAW;wcex.lpfnWndProc= (WNDPROC)WndProc;wcex.cbClsExtra= 0;wcex.cbWndExtra= 0;wcex.hInstance= hInstance;wcex.hIcon= LoadIcon(hInstance, (LPCTSTR)IDI_A3);wcex.hCursor= LoadCursor(NULL, IDC_ARROW);wcex.hbrBackground= (HBRUSH)(COLOR_WINDOW+1);wcex.lpszMenuName= (LPCSTR)IDC_A3;wcex.lpszClassName= szWindowClass;wcex.hIconSm= LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);return RegisterClassEx(&wcex);}//// FUNCTION: InitInstance(HANDLE, int)//// PURPOSE: Saves instance handle and creates main window//// COMMENTS://// In this function, we save the instance handle in a global variable and// create and display the main program window.//BOOL InitInstance(HINSTANCE hInstance, int nCmdShow){ HWND hWnd; HDC bufdc; // HBITMAP bmp; BITMAP bm1,bm2; hInst = hInstance; // Store instance handle in our global variable hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL); if (!hWnd) { return FALSE; } MoveWindow(hWnd,0,0,600,400,true); ShowWindow(hWnd, nCmdShow); UpdateWindow(hWnd); //获取当前的显示设备上下文 bg = (HBITMAP)LoadImage(NULL,"bg2.bmp",IMAGE_BITMAP,600,400,LR_LOADFROMFILE); bmp=(HBITMAP)LoadImage(NULL,"girl.bmp",IMAGE_BITMAP,300,200,LR_LOADFROMFILE); GetObject(bg,sizeof(BITMAP),&bm1); if(bm1.bmBitsPixel!=32&&bm1.bmBitsPixel !=24) { MessageBox(NULL,"此程序","警告",0); return FALSE; } hdc = GetDC(hWnd); mdc= CreateCompatibleDC(hdc);//创建存放图象的显示缓冲 bufdc= CreateCompatibleDC(hdc);//创建存放图象的显示缓冲 girl=CreateCompatibleBitmap(hdc,300,200);//创建存放图象的显示缓冲 SelectObject(mdc,girl); //将位图资源装入显示缓冲 //在mdc进得透明处理 SelectObject(bufdc,bg); //将位图资源装入显示缓冲 BitBlt(mdc,0,0,300,200,bufdc,xstart,ystart,SRCCOPY); SelectObject(bufdc,bmp); //将位图资源装入显示缓冲 BitBlt(mdc,0,0,300,200,bufdc,300,0,SRCAND); BitBlt(mdc,0,0,300,200,bufdc,0,0,SRCPAINT); unsigned char *px1,*px2; //处理背景图 px1=new unsigned char [bg,bm1.bmHeight *bm1.bmWidthBytes ]; GetBitmapBits(bg,bm1.bmHeight *bm1.bmWidthBytes,px1); //处理前景图 GetObject(girl,sizeof(BITMAP),&bm2); px2=new unsigned char [girl,bm2.bmHeight *bm2.bmWidthBytes ]; GetBitmapBits(girl,bm2.bmHeight *bm2.bmWidthBytes,px2); int xend,yend; int x,y,i; int rgb_b; int pxBytes=bm1.bmBitsPixel/8; xend=xstart+300; yend=ystart+200; for(y=ystart;y<yend;y++) { for(x=xstart;x<xend;x++) { rgb_b=y*bm1.bmWidthBytes +x*pxBytes; px1[rgb_b]=px1[rgb_b]*0.7; px1[rgb_b+1]=px1[rgb_b+1]*0.7; px1[rgb_b+2]=px1[rgb_b+2]*0.7; } } for(y=0;y<bm2.bmHeight ;y++) { for(x=0;x<bm2.bmWidth ;x++) { rgb_b=y*bm2.bmWidthBytes +x*pxBytes; i=(ystart+y)*bm1.bmWidthBytes +(xstart+x)*pxBytes; px2[rgb_b]=px2[rgb_b]*0.3+px1[i]; px2[rgb_b+1]=px2[rgb_b+1]*0.3+px1[i+1]; px2[rgb_b+2]=px2[rgb_b+2]*0.3+px1[i+2]; } } /* */ SetBitmapBits(girl,bm2.bmHeight *bm2.bmWidthBytes ,px2); MyPaint(hdc); ReleaseDC(hWnd,hdc); delete(px1); delete(px2); return TRUE;}//// FUNCTION: WndProc(HWND, unsigned, WORD, LONG)//// PURPOSE: Processes messages for the main window.//// WM_COMMAND- process the application menu// WM_PAINT- Paint the main window// WM_DESTROY- post a quit message and return////LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam){int wmId, wmEvent;PAINTSTRUCT ps;HDC hdc;TCHAR szHello[MAX_LOADSTRING];LoadString(hInst, IDS_HELLO, szHello, MAX_LOADSTRING);switch (message) {case WM_COMMAND:wmId = LOWORD(wParam); wmEvent = HIWORD(wParam); // Parse the menu selections:switch (wmId){case IDM_ABOUT: DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About); break;case IDM_EXIT: DestroyWindow(hWnd); break;default: return DefWindowProc(hWnd, message, wParam, lParam);}break;case WM_PAINT:hdc = BeginPaint(hWnd, &ps);// TODO: Add any drawing code here...RECT rt;GetClientRect(hWnd, &rt);DrawText(hdc, szHello, strlen(szHello), &rt, DT_CENTER);EndPaint(hWnd, &ps);break;case WM_DESTROY:PostQuitMessage(0);break;default:return DefWindowProc(hWnd, message, wParam, lParam); } return 0;}// Mesage handler for about box.LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam){switch (message){case WM_INITDIALOG:return TRUE;case WM_COMMAND:if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL) {EndDialog(hDlg, LOWORD(wParam));return TRUE;}break;} return FALSE;}void MyPaint(HDC hdc){SelectObject(mdc,bg); //将位图资源装入显示缓冲BitBlt(hdc,0,0,600,400,mdc,0,0,SRCCOPY);SelectObject(mdc,girl); //将位图资源装入显示缓冲BitBlt(hdc,xstart,ystart,300,200,mdc,0,0,SRCCOPY);//BitBlt(hdc,100,200,150,100,mdc,0,0,SRCPAINT);}