stm32 /stm32h7rs /STM32H7R /DMA2D /DMA2D_FGPFCCR

Color mode These bits defines the color format of the foreground image. Others: Reserved

0 (B_0x0): ARGB8888

1 (B_0x1): RGB888

2 (B_0x2): RGB565

3 (B_0x3): ARGB1555

4 (B_0x4): ARGB4444

5 (B_0x5): L8

6 (B_0x6): AL44

7 (B_0x7): AL88

8 (B_0x8): L4

9 (B_0x9): A8

10 (B_0xA): A4

11 (B_0xB): YCbCr

CLUT color mode This bit defines the color format of the CLUT.

0 (B_0x0): ARGB8888

1 (B_0x1): RGB888

Start This bit can be set to start the automatic loading of the CLUT. It is automatically reset: at the end of the transfer when the transfer is aborted by the user by setting ABORT in DMA2D_CR when a transfer error occurs when the transfer has not started due to a configuration error or another transfer operation already ongoing (data transfer or automatic background CLUT transfer)

CLUT size These bits define the size of the CLUT used for the foreground image. The number of CLUT entries is equal to CS[7:0] + 1.

Alpha mode These bits select the alpha channel value to be used for the foreground image. Others: Reserved

0 (B_0x0): No modification of the foreground image alpha channel value

1 (B_0x1): Replace original foreground image alpha channel value by ALPHA[7: 0]

2 (B_0x2): Replace original foreground image alpha channel value by ALPHA[7:0] multiplied with original alpha channel value

Chroma subsampling These bits define the chroma subsampling mode for YCbCr color mode. Others: Reserved

0 (B_0x0): 4:4:4 (no chroma subsampling)

1 (B_0x1): 4:2:2

2 (B_0x2): 4:2:0

Alpha inverted This bit inverts the alpha value.

0 (B_0x0): Regular alpha

1 (B_0x1): Inverted alpha

Red/Blue swap This bit allows to swap Red and Blue to support BGR or ABGR color formats.

0 (B_0x0): Regular mode (RGB or ARGB)

1 (B_0x1): Swap mode (BGR or ABGR)

Alpha value These bits define a fixed alpha channel value which can replace the original alpha value, or be multiplied by the original alpha value, according to the alpha mode selected through AM[1:0] in this register.