L_TrimBitmap

#include "l_bitmap.h"

L_LTKRN_API L_INT L_TrimBitmap(pBitmap, nCol, nRow, uWidth, uHeight)

pBITMAPHANDLE pBitmap;

pointer to the bitmap handle

L_INT nCol;

x coordinate origin of the rectangle to keep

L_INT nRow;

y coordinate origin of the rectangle to copy

L_UINT uWidth;

width of the rectangle to keep (in pixels)

L_UINT uHeight;

height of the rectangle to keep (in pixels)

Crops the bitmap, resulting in a bitmap that is the size of the specified rectangle. If a region is defined for the bitmap, the region is also cropped if necessary.

Parameter

Description

pBitmap

Pointer to the bitmap handle referencing the bitmap to trim.

nCol

The X coordinate of the pixel within the bitmap that is the origin of the rectangle to keep.

nRow

The Y coordinate of the pixel within the bitmap that is the origin of the rectangle to keep.

uWidth

Width of the rectangle to keep (in pixels).

uHeight

Height of the rectangle to keep (in pixels).

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

Use this function instead of L_CopyBitmapRect when the original bitmap is not needed after cropping.

This function uses bitmap coordinates to specify the area to be copied. Therefore, you must account for the view perspective of the bitmap. For information about bitmap coordinates, refer to Accounting for View Perspective.

Required DLLs and Libraries

LTKRN

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, Linux.

See Also

Functions:

L_AutoTrimBitmap, L_GetAutoTrimRect, L_CopyBitmapRect

Topics:

Raster Image Functions: Doing Geometric Transformations

Example

L_INT TrimBitmapExample(pBITMAPHANDLE pBitmap) 
{ 
   L_INT nRet; 
   L_INT nCol    = 10; 
   L_INT nRow    = 10; 
   L_UINT nWidth  = pBitmap->Width - nCol - 10; 
   L_UINT nHeight = pBitmap->Height - nRow - 10; 
 
   nRet = L_TrimBitmap (pBitmap, nCol, nRow, nWidth, nHeight); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   return SUCCESS; 
} 
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