Creates a grayscale bitmap from the source bitmap's alpha channel data.
#include "l_bitmap.h"
L_LTKRN_API L_INT L_GetBitmapAlpha(pBitmap, pAlpha, uStructSize)
Points to the source bitmap handle.
Points to the destination bitmap handle to hold the alpha channel data.
Size in bytes, of the structure pointed to by pAlpha
, for versioning. Use sizeof(BITMAPHANDLE).
Value | Meaning |
---|---|
SUCCESS | The function was successful. |
< 1 | An error occurred. Refer to Return Codes. |
This function does not support signed data images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image is passed to this function.
Only 16-, 32-, and 64-bit images can have an alpha channel. If the source bitmap has another color resolution, the result is an image filled with zeros.
Typically, the alpha channel contains a mask that is used for transparency, as shown in the example for L_SetBitmapAlpha.
Win32, x64, Linux.
For an example, refer to L_SetBitmapAlpha.
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