LBitmapBase::Combine

#include "ltwrappr.h"

virtual L_INT LBitmapBase::Combine(pLBitmapSrc, nWidth, nHeight, nXDst, nYDst, nXSrc, nYSrc, uMaxedFlags=CB_OP_ADD|CB_DST_0, uFlags = 0)

Combines the image data of both the class objects bitmap (the destination bitmap) and the specified bitmap (the source bitmap), letting you specify the areas to be combined, the operations to be performed when combining the data, and which color planes (R or G or B or R, G, and B) are used. The class objects bitmap is updated with the result of this operation.

Returns

Comments

For example, suppose you use the LBitmap::SpatialFilter function to apply an edge detection filter. You can then use this function to combine the resulting bitmap with the original one to produce an image with hard edges.

This function combines the data byte-by-byte. The two images can be any color resolution. Images that are 24-bits per pixel are the easiest and fastest to combine. This function uses Windows-style coordinates (with a top-left origin) to specify the areas to be combined.

If the channel setting for one of the bitmaps is the master channel (CB_SRC_MASTER, CB_DST_MASTER, CB_RES_MASTER) the settings for all the bitmaps will be set to master.

To update a status bar or detect a user interrupt during execution of this function, refer to LBase::EnableStatusCallback.

If a region is defined for either the source or destination bitmap, or both bitmaps, the combine applies only to the intersection of regions.

For example, assume CB_SRC_RED is passed for the source bitmap, CB_DST_BLUE is passed for the destination bitmap and CB_RES_GREEN is passed for the resulting bitmap. In this case, the green channel of the resulting bitmap is calculated as the result of the operations applied to the red channel of the source bitmap and the blue channel of the destination bitmap. The other channels of the resulting bitmap are unchanged.

This function supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available only in the Document/Medical toolkits.

Required DLLs and Libraries

See Also

Example

This example uses the flags for a simple paste when combining

the source bitmap with the destination bitmap.

L_INT LBitmapBase__CombineExample()
{
   L_INT nRet;
   LBitmapBase  LeadBitmap;   /* Bitmap handle to hold the loaded image */
   LBitmapBase TmpBitmap; /* Temporary bitmap */
   L_INT XDst;  /* Column offset of the destination */
   L_INT XSize; /* Pixel width of the rectangle to combine */
   L_INT YDst;  /* Row offset of the destination */
   L_INT YSize; /* Pixel height of the rectangle to combine */
   L_INT XSrc;  /* Column offset of the source */
   L_INT YSrc;  /* Column offset of the source */
   /* Load both bitmaps, at 24 bits per pixel */
   nRet =LeadBitmap.Load (TEXT("%UserProfile%\\My Documents\\LEADTOOLS Images\\IMAGE3.CMP"));
   if(nRet !=SUCCESS)
      return nRet;
   nRet =TmpBitmap.Load(TEXT("%UserProfile%\\My Documents\\LEADTOOLS Images\\ULAY4.BMP"));
   if(nRet !=SUCCESS)
      return nRet;
   /* Specify a position in the top left part of the displayed image */
   XDst = LeadBitmap.GetWidth();
   YDst = LeadBitmap.GetHeight() / 8;
   /* Use the full size of the source bitmap */
   YSize = TmpBitmap.GetWidth();
   XSize = TmpBitmap.GetHeight();
   XSrc = 0;
   YSrc = 0;
   /* Combine TmpBitmap with LeadBitmap, using flags for an ordinary paste */
   nRet =LeadBitmap.Combine(&TmpBitmap, XSize, YSize, XDst, YDst, XSrc, YSrc, CB_OP_ADD | CB_DST_0);
   if(nRet !=SUCCESS)
      return nRet;
   return SUCCESS;
}