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L_ImgKrnRotateFlipImage

#include "ltimgkrn.h"

L_LTIMGKRN_API L_INT L_ImgKrnRotateFlipImage(bitmap, type)

Rotates and flips the bitmap.

Parameters

BITMAPHANDLE *bitmap

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

L_ImgKrnRotateFlipType type

The type of rotation and flip to apply.

Returns

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

Comments

This function rotates the image clockwise.

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

The following example loads a bitmap and flips it vertically.

L_INT KrnRotateFlipImageExample(L_VOID) 
{ 
   L_INT ret; 
   BITMAPHANDLE bitmap;       /* Bitmap handle to hold the loaded image. */ 
 
   /* 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; 
 
   /* Rotate the image vertically */ 
   ret = L_ImgKrnRotateFlipImage(&bitmap, L_ImgKrnRotateFlipType_RotateNoneFlipY); 
 
   // Check if document detected 
   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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