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L_ImgKrnCropImage

#include "ltimgkrn.h"

L_LTIMGKRN_API L_INT L_ImgKrnCropImage(bitmap, rect)

Crops the bitmap, resulting in a bitmap having the size of the specified rectangle.

Parameters

BITMAPHANDLE *bitmap

Pointer to the bitmap handle referencing the bitmap to be cropped.

const L_RECT *rect

The rectangular area to which the bitmap will be cropped.

Returns

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

Comments

This function uses bitmap coordinates to specify the area to be cropped. Therefore, you must account for the view perspective of the bitmap.

Note: All functions with the L_ImgKrn prefix modify the underlying properties of the input BITMAPHANDLE, including but not limited to:

BitsPerPixel
Order

To avoid BITMAPHANDLE property fidelity loss, pass a copy of your BITMAPHANDLE to all L_ImgKrn* functions.

Required DLLs and Libraries

LTIMGKRN
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.

Functions

Topics

Raster Image Functions: Doing Geometric Transformations

Example

This example loads an image and crops it.

L_INT KrnCropImageExample(L_VOID) 
{ 
   L_INT ret; 
   BITMAPHANDLE bitmap;   /* Bitmap handle to hold the loaded image. */ 
   L_RECT cropBounds;     /* Area to keep. */ 
 
   /* Load the bitmap */ 
   ret = L_LoadBitmap(MAKE_IMAGE_PATH(TEXT("cannon.jpg")), &bitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if (ret != SUCCESS) 
      return ret; 
 
   /* Crop half the image */ 
   cropBounds.left = 0; 
   cropBounds.top = 0; 
   cropBounds.right = bitmap.Width / 2; 
   cropBounds.bottom = bitmap.Height; 
 
   ret = L_ImgKrnCropImage(&bitmap, &cropBounds); 
   if (ret == SUCCESS) 
      ret = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &bitmap, FILE_BMP, 24, 0, NULL); 
 
   L_FreeBitmap(&bitmap); 
 
   return ret; 
}

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