LBitmapBase::CreateAlphaBitmap
#include "ltwrappr.h"
virtual L_INT LBitmapBase::CreateAlphaBitmap(LBitmapSrc)
LBitmapBase& LBitmapSrc; |
/* the source class object */ |
Creates an alpha bitmap from the alpha channel of another class object's bitmap.
Parameter |
Description |
LBitmapSrc |
The source class object from which to create the alpha bitmap. |
Returns
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
Comments
Call this function to create an alpha bitmap from the alpha channel of another class object's bitmap.
Note: |
The LBitmapSrc parameter is passed by reference, and is a required parameter. |
Required DLLs and Libraries
LTDIS For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application. |
See Also
Functions: |
LFile::LoadCMYKArray, LFile::SaveCMYKArray, LPaint::PaintDCCMYKArray, LBitmapBase::Free, LBitmapBase::Create, Class Members |
Topics: |
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Example
The following function checks if an image has a useful alpha channel bitmap.
L_INT LBitmapBase__CreateAlphaBitmapExample(L_TCHAR* pszImageFile) { L_INT nRet; LBitmapBase Bitmap, AlphaBitmap; LBitmapRgn Region; L_SIZE_T uArea; nRet =Bitmap.Load(pszImageFile, 0, ORDER_BGR); if(nRet !=SUCCESS) return nRet; nRet =AlphaBitmap.CreateAlphaBitmap(Bitmap); if(nRet !=SUCCESS) return nRet; Region.SetBitmap(&AlphaBitmap); Region.SetRgnCombineMode(L_RGN_SETNOT); Region.SetRgnColor(RGB(0, 0, 0) /* Black */); Region.GetRgnArea(&uArea); if (uArea != 0) MessageBox(NULL, TEXT("The image has a useful alpha bitmap."), TEXT("Test"), MB_OK); return SUCCESS; }