[FAQ] PROCESSOR-SDK-TDAX: Flip/Mirror support in the display node

The DISPC supports on-the-fly source image flip along the x/y-axis to create a mirror effect on the source data.
The below 3 patches could be used in order to make use of this feature.

The patches are created on top of SDK 07_03_00_07

1. TIOVX_Flip_Support.patch 

In the process function of the display node, the buffer address to be assigned to Fvid queue should be as follow for respective flip options:

     a. No Flip        : No change in the buffer base address.

     b. Vertical Flip : No change in the buffer base address. 

     c. Horizontal Flip :  Buffer base address should point to Start of last line of the window

     d. Both Vertical and horizontal flip : Buffer base address should point to Start of last line of the window

In the control function of the display node, new control command "TIVX_DISPLAY_SELECT_FLIP" is added in order to accept the flip command from the HOST.

This control command uses pointer to structure tivx_display_fliptype_t as an input argument.

Valid values for the flip type are as shown below :
 0 : No Flip
 1 : Horizontal Flip (Along Y-axis)
 2 : Vertical Flip (Along X-axis)
 3 : Horizontal + Vertical Flip

TIOVX_Flip_Support.patch

2. PDK_Flip_Support.patch

Correction in the increment value done for Horizontal flip.
The correct value to the widthInBytes is  widthInBytes + pipeCfg->inFmt.pitch[0] - 1.

Added CSL_DSS_VID1_ATTRIBUTES_FLIP_VAL_NOFLIP in case of No Flip option

PDK_Flip_Support.patch

3. Vision_Apps_Flip_Support.patch

Created additional user interface for flipping the source image by the user.

User could enter 'f' and then the corresponding flip type required as shown below :

v: Vertical Flip
h: Horizontal Flip
f: Full Flip
n: No Flip

Once the fliptype is selected, the Host send the information to the display node and the source image is flipped on the display.

VisionApps_Flip_Support.patch

Please find the patches for SDK 8.2 below

Flip_support_8_2.zip