L_RotateBitmapViewPerspective (original) (raw)
Summary
Rotates an image by changing the bitmap's view perspective.
Syntax
#include "l_bitmap.h"
L_LTKRN_API L_INT L_RotateBitmapViewPerspective(pBitmap, nAngle)
Parameters
pBITMAPHANDLE pBitmap
Pointer to the bitmap handle.
L_INT nAngle
Degrees of rotation. Valid values +-90, +-180, +-270, or +-360. Positive values are clockwise; negative values are counterclockwise.
Returns
| Value | Meaning |
|---|---|
| SUCCESS | The function was successful. |
| < 1 | An error occurred. Refer to Return Codes. |
Comments
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
- 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
Topics
Example
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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