ICM_DECOMPRESS_SET_PALETTE

The ICM_DECOMPRESS_SET_PALETTE message specifies a palette for a video decompression driver to use if it is decompressing to a format that uses a palette.

Parameters

DwParam1

Address of a BITMAPINFOHEADER structure whose color table contains the colors that should be used if possible. If zero, use the default set of output colors.

DwParam2

Not used.

Return Values

Returns ICERR_OK if the decompression driver can precisely decompress images to the suggested palette using the set of colors as they are arranged in the palette. Returns ICERR_UNSUPPORTED otherwise.

Comments

This message should not affect decompression already in progress; rather, colors passed using this message should be returned in response to future ICM_DECOMPRESS_GET_FORMAT and ICM_DECOMPRESS_GET_PALETTE messages. Colors are sent back to the decompression driver in a future ICM_DECOMPRESS_BEGIN message.

This message is used primarily when a driver decompresses images to the screen and another application that uses a palette is in the foreground, forcing the decompression driver to adapt to a foreign set of colors.