ID2D1Bitmap to Wic with Alpha but not PNG
See the question and my original answer on StackOverflowThe native BMP codec supports one property, EnableV5Header32bppBGRA
of type VT_BOOL
:
Specifies whether to allow encoding data in the GUID_WICPixelFormat32bppBGRA pixel format. If this option is set to VARIANT_TRUE, the BMP will be written out with a BITMAPV5HEADER header. The default value is VARIANT_FALSE.
Note for 16-bit and 32-bit Windows BMP files, the BMP codec ignores any alpha channel, as many legacy image files contain invalid data in this extra channel. Starting with Windows 8, 32-bit Windows BMP files written using the BITMAPV5HEADER with valid alpha channel content are read as WICPixelFormat32bppBGRA