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L_ResizeBitmapRgn

Summary

Resizes a bitmap region by the specified number of pixels.

Syntax

#include "l_bitmap.h"

L_LTIMGEFX_API L_INT L_ResizeBitmapRgn(pBitmap, uDim, uFlags, bAsFrame)

Parameters

pBITMAPHANDLE pBitmap

Pointer to the bitmap handle that references the bitmap to resize.

L_UINT uDim

Number of pixels by which to resize the region.

L_UINT uFlags

Flag that indicates whether to contract or expand the bitmap region. Possible values are:

Value	Meaning
RGN_EXPAND	[0x0001] Expand the region.
RGN_CONTRACT	[0x0002] Contract the region.

L_BOOL bAsFrame

Flag that indicates whether to create a frame associated with the resized bitmap region. Possible values are:

Value	Meaning
TRUE	Create a frame of thickness `uDim` for the resized region. If `uFlags` is RGN_EXPAND, the frame created will exist outside the boundaries of the resized region. If uFlags is RGN_CONTRACT, the frame will be within the boundaries of the resized region.
FALSE	Resize the region only. Do not create a frame.

Returns

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

Comments

This function keeps the same bitmap handle and resizes the bitmap region that it references.

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 in the Document and Medical Imaging toolkits.

This function supports 32-bit grayscale images.

Required DLLs and Libraries

LTIMGEFX
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

For complete sample code, refer to the ImgChd.c module of the IMGFEATR example.
This example changes a bitmap region size

L_INT ResizeBitmapRgnExample() 
{ 
   L_INT nRet; 
   RECT rRgnRect;               /* Rectangle that defines the region */ 
   BITMAPHANDLE Bitmap; /* Bitmap handle to hold the loaded image. */ 
 
   /* Load a bitmap */ 
   nRet = L_LoadBitmap(MAKE_IMAGE_PATH(TEXT("IMAGE1.CMP")), &Bitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   /* Specify a rectangle to define a region , this region specify by the mouse on IMGFEATR demo*/ 
   SetRect(&rRgnRect, 80, 20, 100, 40); 
 
   /* Create an elliptical region */ 
   nRet = L_SetBitmapRgnEllipse(&Bitmap, NULL, &rRgnRect, L_RGN_SET); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   /* contract the bitmap region by 20 pixels*/ 
   nRet = L_ResizeBitmapRgn(&Bitmap, 20, RGN_CONTRACT, FALSE); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   /* Free the region */ 
   L_FreeBitmapRgn(&Bitmap); 
 
   //free Bitmap 
   nRet = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &Bitmap, FILE_BMP, 24, 0, NULL); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   L_FreeBitmap(&Bitmap); 
   return SUCCESS; 
}