#include "l_bitmap.h"
L_LTKRN_API L_INT L_RotateBitmapViewPerspective(pBitmap, nAngle)
Rotates an image by changing the bitmap's view perspective.
Pointer to the bitmap handle.
Degrees of rotation. Valid values +-90, +-180, +-270, or +-360. Positive values are clockwise; negative values are counterclockwise.
Value | Meaning |
---|---|
SUCCESS | The function was successful. |
< 1 | An error occurred. Refer to Return Codes. |
This function achieves fast rotation by changing only the view perspective. After using this function, you can reverse the result by restoring the original View Perspective.
Some functions must account for the view perspective. For general information about view perspectives, refer to Accounting for View Perspective.
Required DLLs and Libraries
Win32, x64, Linux.
L_INT RotateBitmapViewPerspectiveExample(L_VOID)
{
L_INT nRet;
BITMAPHANDLE LeadBitmap;
nRet = L_LoadBitmap(MAKE_IMAGE_PATH(TEXT("IMAGE1.CMP")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
if(nRet != SUCCESS)
return nRet;
nRet = L_RotateBitmapViewPerspective ( &LeadBitmap, 90 );
if(nRet != SUCCESS)
return nRet;
nRet = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &LeadBitmap, FILE_BMP, 24, 0, NULL);
if(nRet != SUCCESS)
return nRet;
if(LeadBitmap.Flags.Allocated)
L_FreeBitmap(&LeadBitmap);
return SUCCESS;
}
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