位图和位块传输(1)BitBlt与PatBlt

BitBlt读作"bit blit"表示位块传输，BitBlt函数是像素移动者，或者，更生动的说，点阵撞击者，下面是一个简单的BitBlt

#include<windows.h>LRESULT CALLBACK WindowProc(HWND hwnd,      // handle to windowUINT uMsg,      // message identifierWPARAM wParam,  // first message parameterLPARAM lParam   // second message parameter);int WINAPI WinMain(   HINSTANCE hInstance,      // handle to current instance   HINSTANCE hPrevInstance,  // handle to previous instance   LPSTR lpCmdLine,          // command line   int nCmdShow              // show state   ){static TCHAR szAppName[]=TEXT("leidemingzi");HWND hwnd;MSG msg;WNDCLASS wndclass;wndclass.cbClsExtra=0;wndclass.cbWndExtra=0;wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);wndclass.hIcon=LoadIcon(NULL,IDI_ERROR);wndclass.hInstance=hInstance;wndclass.lpfnWndProc=WindowProc;wndclass.lpszClassName=szAppName;wndclass.lpszMenuName=NULL;wndclass.style=CS_HREDRAW|CS_VREDRAW;if(!RegisterClass(&wndclass)){MessageBox(NULL,TEXT("the program requrie the window nt"),TEXT("tips"),MB_ICONERROR);return 0;}hwnd=CreateWindow(szAppName,  // registered class nameTEXT("this is title"), // window nameWS_OVERLAPPEDWINDOW,        // window styleCW_USEDEFAULT,                // horizontal position of windowCW_USEDEFAULT,                // vertical position of windowCW_USEDEFAULT,           // window widthCW_USEDEFAULT,          // window heightNULL,      // handle to parent or owner windowNULL,          // menu handle or child identifierhInstance,  // handle to application instanceNULL// window-creation data);ShowWindow(hwnd,nCmdShow);UpdateWindow(hwnd);while(GetMessage(&msg,NULL,0,0)){TranslateMessage(&msg);DispatchMessage(&msg);}return msg.wParam;}LRESULT CALLBACK WindowProc(HWND hwnd,      // handle to windowUINT uMsg,      // message identifierWPARAM wParam,  // first message parameterLPARAM lParam   // second message parameter){static int cxClient,cyClient,cxSource,cySource;HDC hdcClient,hdcWindow;int x,y;PAINTSTRUCT ps;switch(uMsg){case WM_CREATE:cxSource=GetSystemMetrics(SM_CXSIZEFRAME)+GetSystemMetrics(SM_CXSIZE);cySource=GetSystemMetrics(SM_CYSIZEFRAME)+GetSystemMetrics(SM_CYCAPTION);return 0;case WM_SIZE:cxClient=LOWORD(lParam);cyClient=HIWORD(lParam);return 0;case WM_PAINT:hdcClient=BeginPaint(hwnd,&ps);hdcWindow=GetWindowDC(hwnd);for(y=0;y<cyClient;y+=cySource)for(x=0;x<cxClient;x+=cxSource){BitBlt(hdcClient,x,y,cxSource,cySource,hdcWindow,0,0,NOTSRCCOPY);//SRCCOPY}ReleaseDC(hwnd,hdcWindow);EndPaint(hwnd,&ps);return 0;case WM_DESTROY:PostQuitMessage(0);return 0;}return DefWindowProc(hwnd,uMsg,wParam,lParam);}

 

BitBlt函数把像素从一个设备环境（源）的矩形区域，传输到另一个设备环境（目标）中的一个同样大小的矩形区域，这个函数的语法如下

BitBlt(hdcDst,xDst,yDst,cx,cy,hdcSrc,xSrc,ySrc,dwRop);

其中dwRop的值可以取下面的值：

 

这里的BitBlt是两个设备环境作为参数。

Windows函数有个称为PatBlt图案块传输函数，只是需要一个设备环境即可，它的作用相当于一个Rectangle

LRESULT CALLBACK WindowProc(   HWND hwnd,      // handle to window   UINT uMsg,      // message identifier   WPARAM wParam,  // first message parameter   LPARAM lParam   // second message parameter   ){HDC hdc;PAINTSTRUCT ps;HBRUSH hbrush;RECT rect;  switch(uMsg)  {  case WM_CREATE:  return 0;  case WM_PAINT:  hdc=BeginPaint(hwnd,&ps);  PatBlt(hdc,0,0,100,200,BLACKNESS);  hbrush=CreateSolidBrush(RGB(255,0,0));  hbrush=(HBRUSH)SelectObject(hdc,hbrush);  Rectangle(hdc,200,200,300,300);  DeleteObject(hbrush);  SelectObject(hdc,hbrush);  Rectangle(hdc,400,400,500,500);  SetRect(&rect,500,500,600,600);  FillRect(hdc,&rect,CreateSolidBrush(RGB(100,100,100)));  EndPaint(hwnd,&ps);  return 0;  case WM_DESTROY:  PostQuitMessage(0);  return 0;  }  return DefWindowProc(hwnd,uMsg,wParam,lParam);}

 

这里的的dwRop只能取

BLACKNESS,DSTINVERT,PAINVERT,PATCOPY,WHITENESS等