win.c

基于H.263的图像压缩编解码的C源码

/************************************************************************
 *
 *  win.c, display routines for Win32 for tmndecode (H.263 decoder)
 *  
 ************************************************************************/

#include "config.h"
#include "main.h"
#include "global.h"
#include "win.h"

#ifdef WINDOWS

/* vdinit.c */

T_VDWINDOW vdWindow;

int initDisplay (int pels, int lines)
{
  int errFlag = 0;

  init_dither_tab();
  errFlag |= InitDisplayWindowThread (pels, lines);

  return errFlag;
}


int InitDisplayWindowThread (int width, int height)
{
  int errFlag = 0;

  /* now modify the couple that need it */
  vdWindow.width = width;
  vdWindow.height = height;
  vdWindow.biHeader.biWidth = vdWindow.width;
  vdWindow.biHeader.biHeight = vdWindow.height;
  vdWindow.biHeader.biSize = sizeof(BITMAPINFOHEADER);
  vdWindow.biHeader.biCompression = BI_RGB;
  vdWindow.biHeader.biPlanes = 1;
  vdWindow.biHeader.biBitCount = 24;

  vdWindow.biHeader.biSizeImage = 3 * vdWindow.width * vdWindow.height;
  vdWindow.imageIsReady = FALSE;

  /* allocate the memory needed to hold the RGB and visualization information */
  vdWindow.bufRGB = (unsigned char *)malloc (3 * vdWindow.width * vdWindow.height);

  /* Create synchronization event */
  vdWindow.hEvent = CreateEvent(NULL,FALSE,FALSE,NULL);

  vdWindow.hThread = 
    CreateThread (
      NULL, 
      0, 
      (LPTHREAD_START_ROUTINE) DisplayWinMain, 
      (LPVOID) NULL, 
      0, 
      &(vdWindow.dwThreadID)
    );

  if (vdWindow.hThread == NULL) {
    errFlag = 1;
    return errFlag;
  }

  return errFlag;
}

/* vddraw.c */

int displayImage (unsigned char *lum, unsigned char *Cr, unsigned char *Cb)
{
  int errFlag = 0;
  DWORD dwRetVal;

  /* wait until we have finished drawing the last frame */
  if (vdWindow.windowDismissed == FALSE) {
    vdWindow.src[0] = lum;
    vdWindow.src[1] = Cb;
    vdWindow.src[2] = Cr;

    /* wait until previous frame has been drawn */
    dwRetVal = WaitForSingleObject(vdWindow.hEvent,INFINITE);

    vdWindow.imageIsReady = TRUE;
    /* Post message to drawing thread's window to draw frame */
    PostMessage (vdWindow.hWnd, VIDEO_DRAW_FRAME, (WPARAM) NULL, (LPARAM) NULL);

	}
	
	return errFlag;
}

int DrawDIB()
{											      
  int errFlag = 0;

  errFlag |= 
    DrawDibDraw (
      vdWindow.hDrawDib, 
      vdWindow.hDC, 
      0, 
      0, 
      vdWindow.zoom * vdWindow.width, 
      vdWindow.zoom * vdWindow.height, 
      &vdWindow.biHeader, 
      vdWindow.bufRGB, 
      0, 
      0, 
      vdWindow.width, 
      vdWindow.height, 
      DDF_SAME_DRAW
    ); 
 
      return errFlag;
}

/* vdwinman.c */

void DisplayWinMain (void *dummy)
{
  int errFlag = 0;
  DWORD dwStyle;
	
  vdWindow.wc.style =  CS_BYTEALIGNWINDOW;				 
  vdWindow.wc.lpfnWndProc = MainWndProc;
  vdWindow.wc.cbClsExtra = 0;
  vdWindow.wc.cbWndExtra = 0;
  vdWindow.wc.hInstance = 0;
  vdWindow.wc.hIcon = LoadIcon (NULL, IDI_APPLICATION);
  vdWindow.wc.hCursor = LoadCursor (NULL, IDC_ARROW);
  vdWindow.wc.hbrBackground = GetStockObject (WHITE_BRUSH);
  vdWindow.wc.lpszMenuName = NULL;
  vdWindow.zoom = 1;
  strcpy (vdWindow.lpszAppName, "H.263 Display");
  vdWindow.wc.lpszClassName = vdWindow.lpszAppName;

  RegisterClass(&vdWindow.wc);

  dwStyle =  WS_DLGFRAME | WS_SYSMENU | WS_MINIMIZEBOX | WS_MAXIMIZEBOX;

  vdWindow.hWnd = 
    CreateWindow (vdWindow.lpszAppName,
      vdWindow.lpszAppName,
      dwStyle,
      CW_USEDEFAULT,
      CW_USEDEFAULT,
      vdWindow.width + 6,
      vdWindow.height + 25,
      NULL,
      NULL,
      0,
      NULL
    );
	
  if (vdWindow.hWnd == NULL)
    ExitThread (errFlag = 1);

  ShowWindow(vdWindow.hWnd, SW_SHOWNOACTIVATE);
  UpdateWindow(vdWindow.hWnd);

  /* Message loop for display window's thread */
  while (GetMessage (&(vdWindow.msg), NULL, 0, 0)) {
    TranslateMessage (&(vdWindow.msg));
    DispatchMessage (&(vdWindow.msg));
  }

  ExitThread (0);
}


LRESULT APIENTRY MainWndProc (HWND hWnd, UINT msg, UINT wParam, LONG lParam)
{
  LPMINMAXINFO lpmmi;

  switch (msg) {
    case VIDEO_BEGIN:
      vdWindow.hDC = GetDC (vdWindow.hWnd);
      vdWindow.hDrawDib = DrawDibOpen();
      vdWindow.zoom = 1;
      vdWindow.oldzoom = 0;
      DrawDibBegin (
        vdWindow.hDrawDib, 
        vdWindow.hDC, 
        2*vdWindow.width, 
        2*vdWindow.height, 
        &vdWindow.biHeader, 
        vdWindow.width, 
        vdWindow.height, 
        0
      );
      SetEvent(vdWindow.hEvent);
      vdWindow.windowDismissed = FALSE;
      ReleaseDC (vdWindow.hWnd, vdWindow.hDC);
      break;
    case VIDEO_DRAW_FRAME:
      vdWindow.hDC = GetDC (vdWindow.hWnd);
      ConvertYUVtoRGB(
        vdWindow.src[0],
        vdWindow.src[1],
        vdWindow.src[2],
        vdWindow.bufRGB,
        vdWindow.width,
        vdWindow.height
      );
      /* draw the picture onto the screen*/
      DrawDIB();
      SetEvent(vdWindow.hEvent);
      ReleaseDC (vdWindow.hWnd, vdWindow.hDC);
      break;
    case VIDEO_END:
      /* Window has been closed.  The following lines handle the cleanup. */
      vdWindow.hDC = GetDC (vdWindow.hWnd);
      DrawDibEnd (vdWindow.hDrawDib);
      DrawDibClose (vdWindow.hDrawDib);
      ReleaseDC (vdWindow.hWnd, vdWindow.hDC);

      vdWindow.windowDismissed = TRUE;
      PostQuitMessage(0);
      break;

    case WM_CREATE:
      PostMessage(hWnd, VIDEO_BEGIN, 0, 0);
      break;
    case WM_SIZE:
      switch (wParam) {
        case SIZE_MAXIMIZED:
          vdWindow.zoom = 2;
          break;
        case SIZE_MINIMIZED:
          vdWindow.oldzoom = vdWindow.zoom;
        	break;
        case SIZE_RESTORED:
          if (vdWindow.oldzoom) {
            vdWindow.zoom = vdWindow.oldzoom;
            vdWindow.oldzoom = 0;
          }
          else
            vdWindow.zoom = 1;
          break;
        case SIZE_MAXHIDE:
          break;
        case SIZE_MAXSHOW:
          break;
      }
      PostMessage(hWnd,WM_PAINT,0,0);
      break;  
    case WM_GETMINMAXINFO:
      lpmmi = (LPMINMAXINFO) lParam;

      GetWindowRect (hWnd, &vdWindow.rect);
      lpmmi->ptMaxPosition.x = vdWindow.rect.left;
      lpmmi->ptMaxPosition.y = vdWindow.rect.top;

      lpmmi->ptMaxSize.x = 2 * (vdWindow.width) + 6;
      lpmmi->ptMaxSize.y = 2 * (vdWindow.height) + 25;
      break;
    case WM_DESTROY:
      /* Window has been closed.  The following lines handle the cleanup. */
      DrawDibEnd (vdWindow.hDrawDib);
      ReleaseDC (vdWindow.hWnd, vdWindow.hDC);
      DrawDibClose (vdWindow.hDrawDib);

      vdWindow.windowDismissed = TRUE;
      PostQuitMessage(0);
      break;
    case WM_PAINT:
      if (vdWindow.imageIsReady) {
        vdWindow.hDC = GetDC (vdWindow.hWnd);
        DrawDIB ();
        ReleaseDC (vdWindow.hWnd, vdWindow.hDC);
      }
      break;

  }
  return DefWindowProc (hWnd, msg, wParam, lParam);
}

/* vdclose.c */

int closeDisplay ()
{
  int errFlag = 0;

  if (vdWindow.hWnd) {
    PostMessage (vdWindow.hWnd, VIDEO_END, (WPARAM) NULL, (LPARAM) NULL);
    while (vdWindow.windowDismissed == FALSE)
      ;
  }

  if (vdWindow.hEvent)
    CloseHandle(vdWindow.hEvent);

  if (vdWindow.hThread)
    CloseHandle (vdWindow.hThread);

  free (vdWindow.bufRGB);

  return errFlag;
}

#endif