LL_DMA2D_InitTypeDef::OutputAlpha field

Specifies the Alpha channel of the output image. - This parameter must be a number between: Min_Data = 0x00 and Max_Data = 0xFF if ARGB8888 color mode is selected. - This parameter must be a number between: Min_Data = 0x00 and Max_Data = 0x01 if ARGB1555 color mode is selected. - This parameter must be a number between: Min_Data = 0x00 and Max_Data = 0x0F if ARGB4444 color mode is selected. - This parameter is not considered if RGB888 or RGB565 color mode is selected. This parameter can be modified afterwards using, unitary function LL_DMA2D_SetOutputColor() or configuration function LL_DMA2D_ConfigOutputColor().