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LBitmapBase::ConvertFromDIB

Summary

Converts a Windows device independent bitmap (DIB) into an LBitmapBase object. When this function is completed, there are two copies of the image in memory: the original DIB and the LEAD bitmap. Freeing one will not affect the other.

Syntax

#include "ltwrappr.h"

virtual L_INT LBitmapBase::ConvertFromDIB(pInfo, pBits)

Parameters

BITMAPINFO * pInfo

Pointer to the Windows BITMAPINFO structure.

L_UCHAR * pBits

Pointer to a buffer containing the DIB image data.

Returns

Value	Meaning
SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

This function updates information in the bitmap handle and copies the DIB image data into the LEAD bitmap.

This function supports the standard DIB formats (BI_RGB and BI_BITFIELDS) as well as some FOURCC (Four Character Code) formats that some capture cards output.

These are the FOURCC that LEADTOOLS supports at the moment:

YVU9 (YUV9)
I420 (YUV12)
YUV2
YV12
IF09
IYUV
UYVY
CYUV
YUY2
YVYU
Y41P
Y211
Y41T
Y42T

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.

Example

This example loads a bitmap, converts it to a DIB, then converts the DIB back to a bitmap

L_INT LBitmapBase__ConvertFromDIBExample(HWND hWnd,LBitmapBase LeadBitmap) 
{ 
   UNREFERENCED_PARAMETER(hWnd); 
 
   L_INT nRet; 
   LBitmapBase  TmpBitmap;     
   HGLOBAL hDIB;               
   BITMAPINFO  * pInfo;   
   L_UCHAR  * pBits;      
   L_INT nColorData;           
 
   /* Load a bitmap at 8 bits per pixel so that we can demonstrate palette handling */ 
   nRet =TmpBitmap.Load (MAKE_IMAGE_PATH(TEXT("ImageProcessingDemo\\Image3.cmp")), 8, ORDER_BGR); 
   if(nRet !=SUCCESS) 
      return nRet; 
   hDIB = TmpBitmap.ConvertToDIB(DIB_BITMAPV5HEADER); 
   pInfo = (BITMAPINFO  *) GlobalLock( hDIB ); 
   if(pInfo->bmiHeader.biBitCount <= 8) 
      nColorData = 1 << pInfo->bmiHeader.biBitCount; 
   else 
      nColorData = 0; 
 
   pBits = (L_UCHAR  *) pInfo + sizeof(BITMAPINFOHEADER) + (nColorData * sizeof(RGBQUAD)); 
    
   nRet =LeadBitmap.ConvertFromDIB(pInfo, pBits); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   GlobalUnlock(hDIB); 
   GlobalFree(hDIB); 
   nRet =TmpBitmap.Free(); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   return SUCCESS; 
}