LPlayBack::ClearUpdateRect

#include "ltwrappr.h"

virtual L_INT LPlayBack::ClearUpdateRect()

Clears the update rectangle used for the class object's animation playback, leaving an empty rectangle.

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Required DLLs and Libraries

LTDIS
LTFIL

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64.

See Also

Functions:

Class Members

Topics:

Raster Image Functions: Creating and Maintaining Lists of Images

 

Implementing Animation

Example

This example uses ClearUpdateRect to avoid painting odd numbered bitmaps.

#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName 
L_INT LPlayBack__ClearUpdateRectExample(HWND hWnd) 
{ 
   L_INT nRet; 
   // this will call the default constructor 
   LBitmap LeadBitmap; 
   LPlayBack PlayBack; 
   HDC hDC; 
   HPALETTE hPalette; 
   L_UINT uState, uIndex; 
   RECT rcClientRect, rcUpdate; 
   L_INT nCounter = 0; 
   GetClientRect(hWnd, &rcClientRect); 
   nRet = LeadBitmap.Create (500, 500,8); 
   if(nRet != SUCCESS) 
      return nRet; 
   nRet = PlayBack.Create (&LeadBitmap); 
   if(nRet != SUCCESS) 
      return nRet; 
   nRet = LeadBitmap.Load (MAKE_IMAGE_PATH(TEXT("image1.cmp")), 8); 
   if(nRet != SUCCESS) 
      return nRet; 
   nRet = PlayBack.Append(&LeadBitmap); 
   if(nRet != SUCCESS) 
      return nRet; 
   nRet = LeadBitmap.Load (MAKE_IMAGE_PATH(TEXT("image2.cmp")), 8); 
   if(nRet != SUCCESS) 
      return nRet; 
   nRet = PlayBack.Append(&LeadBitmap); 
   if(nRet != SUCCESS) 
      return nRet; 
   nRet = LeadBitmap.Load (MAKE_IMAGE_PATH(TEXT("ImageProcessingDemo\\Image3.cmp")), 8); 
   if(nRet != SUCCESS) 
      return nRet; 
   hDC = GetDC(hWnd); 
   hPalette = LeadBitmap.CreatePaintPalette (hDC); 
   hPalette = LeadBitmap.DupPalette(); 
   SelectPalette( hDC, hPalette, TRUE ); 
   RealizePalette(hDC); 
   nRet = PlayBack.Append(&LeadBitmap); 
   if(nRet != SUCCESS) 
      return nRet; 
   uState = PlayBack.GetState(); 
   while(uState != PLAYSTATE_END) 
   { 
      uState = PlayBack.Process(); 
      switch(uState) 
      { 
         case PLAYSTATE_WAITINPUT: 
         nRet = PlayBack.CancelWait(); 
         if(nRet != SUCCESS) 
            return nRet; 
         break; 
         case PLAYSTATE_POSTCLEAR: 
         case PLAYSTATE_POSTRENDER: 
         uIndex = PlayBack.GetIndex (); 
         if(uIndex % 2) 
         { 
            nRet = PlayBack.ClearUpdateRect (); 
            if(nRet != SUCCESS) 
               return nRet; 
         } 
         nRet = PlayBack.GetUpdateRect(&rcUpdate, TRUE); 
         if(nRet != SUCCESS) 
            return nRet; 
         nRet = PlayBack.GetBitmap()->SetClipSrcRect(&rcUpdate); 
         if(nRet != SUCCESS) 
            return nRet; 
         nRet = PlayBack.GetBitmap()->SetDstRect(&rcClientRect); 
         if(nRet != SUCCESS) 
            return nRet; 
         nRet = PlayBack.GetBitmap()->SetClipDstRect(&rcClientRect); 
         if(nRet != SUCCESS) 
            return nRet; 
         PlayBack.GetBitmap()->Paint()->SetDC(hDC); 
         PlayBack.GetBitmap()->CreatePaintPalette (hDC); 
         nRet = PlayBack.GetBitmap()->Paint()->PaintDC(); 
         if(nRet != SUCCESS) 
            return nRet; 
         break; 
      } 
      nCounter  = PlayBack.GetIndex(); 
   } 
   ReleaseDC(hWnd, hDC); 
   return SUCCESS; 
}

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