StretchBlt_demo.rar_DEMO_StretchBlt_字库放大_点阵放大

#include "Include.h" /*============================================================================*/ /*============================================================================*/ int gdev_stretch_blt( struct DC *dst_pdc,int dst_x,int dst_y,int dst_dx,int dst_dy, struct DC *src_pdc,int src_x,int src_y,int src_dx,int src_dy, GUI_ROP rop) { COORD xx,yy,xx0,yy0; int x_scal,y_scal; GUI_COLOR color; //// //调整x,y缩放系数(算法优化:除法->乘法->加法) x_scal =(1.0/((float)dst_dx/(float)src_dx))*65536.0; y_scal =(1.0/((float)dst_dy/(float)src_dy))*65536.0; xx =src_x; yy =src_y; dst_dx +=dst_x; //计算dst_x的结束坐标 dst_dy +=dst_y; //计算dst_y的结束坐标 for(yy0=dst_y;yy0<dst_dy;yy0++) { for(xx0=dst_x;xx0<dst_dx;xx0++) { color=src_pdc->GetPixel(src_pdc,HIWORD(xx),HIWORD(yy)); dst_pdc->PutPixel(dst_pdc,LOWORD(xx0),LOWORD(yy0),color); xx+=x_scal; } xx =src_x; yy +=y_scal; } return 1; } /*============================================================================*/ static U32 StretchBltTestProc(HWND hwnd,U32 msg,WPARAM wParam,LPARAM lParam) { HDC hdc0,hdc1,hdc; RTC_TIME time; char buf[40]; static int dx,dy,x_inc,y_inc; COORD x,y; RECT rc; //// switch(msg) { case MSG_CREATE: TimerCreate(hwnd,0x3000,100); dx=0; dy=0; x_inc=4; y_inc=8; break; //// case MSG_CHAR: switch(wParam) { case VK_LEFT: GetWindowRect(hwnd,&rc); MoveWindow(hwnd,rc.x-8,rc.y); break; //// case VK_RIGHT: GetWindowRect(hwnd,&rc); MoveWindow(hwnd,rc.x+8,rc.y); break; //// case VK_UP: GetWindowRect(hwnd,&rc); MoveWindow(hwnd,rc.x,rc.y-8); break; //// case VK_DOWN: GetWindowRect(hwnd,&rc); MoveWindow(hwnd,rc.x,rc.y+8); break; //// } break; //// case MSG_COMMAND: { U16 code,id; //// code =HIWORD(wParam); id =LOWORD(wParam); //// } break; /////// case MSG_ERASEBKGND: if(1) { RECT rc; ///// hdc =GetClientDC(hwnd); GetWindowClientRect(hwnd,&rc); FillRectangle(hdc,0,0,rc.dx,rc.dy,GetWindowBkColor(hwnd)); ReleaseDC(hdc); } break; //// case MSG_TIMER: GetWindowClientRect(hwnd,&rc); if(dx<=0) x_inc =4; if(dy<=0) y_inc =8; if(dx>=rc.dx) x_inc =-4; if(dy>=rc.dy) y_inc =-8; dx+=x_inc; dy+=y_inc; InvalidateRect(hwnd,0,1); break; //////////// case MSG_PAINT: hdc=BeginPaint(hwnd); hdc0 =CreateMemDC(64,16); FontSetSize(hdc0,12); GetWindowClientRect(hwnd,&rc); RTC_GetTime(&time); StrPrintf(buf,"%02d:%02d:%02d",time.Hour,time.Min,time.Sec); Label(hdc0,0,0,64,16,RGB(00,24,00),RGB(60,160,00),RGB(0,0,0),CENTER,buf); //FillRectangle(hdc,0,0,rc.dx,rc.dy,RGB(80,80,120)); x =(rc.dx-dx)>>1; y =(rc.dy-dy)>>1; x =MAX(0,x); y =MAX(0,y); dx =MIN(rc.dx,dx); dy =MIN(rc.dy,dy); StretchBlt(hdc,x,y,dx,dy,hdc0,0,0,64,16,0); StrPrintf(buf,"宽度:%d,高度:%d ",dx,dy); TextOut(hdc,4,4,RGB(255,0,0),RGB_TRANS,buf); ReleaseDC(hdc0); EndPaint(hwnd,hdc); break; //// default: DefaultWindowProc(hwnd,msg,wParam,lParam); } return MSG_NULL; } /*============================================================================*/ void StretchBltTest(void) { HWND hwnd; MSG msg; //// hwnd =CreateMainWindow( 80,80,240,180, RGB(80,80,120), WS_CAPTION|WS_BORDER, 0, StretchBltTestProc, "StretchBlt 函数演示"); ShowWindow(hwnd,0); while(GetMessage(&msg,hwnd)) { TranslateMessage(&msg); DispatchMessage(&msg); } DestroyMainWindow(hwnd); } /*============================================================================*/