# Function Reference

# _WinAPI_IsAlphaBitmap

Determines whether the specified bitmap has an alpha channel

#include <WinAPIGdi.au3>
_WinAPI_IsAlphaBitmap ( $hBitmap )

## Parameters

$hBitmap | Handle to the bitmap to test. This bitmap must be a 32 bits-per-pixel.

## Return Value

Success: | True - The specified bitmap has an alpha channel. False - Otherwise.
Failure: | Sets the @error flag to non-zero.

## Remarks

This function only works with 32 bits-per-pixel uncompressed bitmaps. If the source bitmap is non 32 bits-per-pixel
bitmap, or is a compressed bitmap, the _WinAPI_IsAlphaBitmap() always returns 0.