TDA4VM: Graph verify failed if create display node with pipeId 3

Hi Nikhil,

Got it and thanks.
I will use pipeId 1 for the third display.

One more question, the purpose of the third display is to make transparent overlay on the second display.
And the second display shows the original camera image using pipeId 0.

I create both display with vx_image of VX_DF_IMAGE_RGBX format.
Then I draw a triangle on the third display by RGBA pixels which alpha value is set to 128.
But I can not see the effect of alpha blending as below image.

How can I got the correct result of alpha blending between the 2nd (camera image) and 3rd (triangle) display?

Thank you very much.

Regards,
Christopher

Hi Christopher,

May I know if you are enabling the global alpha?
Have you rearranged the z-ordert here for the layers?

Christopher said:

But I can not see the effect of alpha blending as below image

May I know what is the expected image?

Regards,

Nikhil

Hi Nikhil,

Thanks for the reply.

I am expecting to see the effect like below.

The transparent red triangle which drawn on the third display overlays the original camera image of the second display.
The red triangle is drawn by OpenCV by RGBA format per pixel, and each pixel can have its own alpha value.
We can see that the original image within red triangle is still visible.

For the global alpha and z-ordert, I had not made further modification to enable it.
Could you please give a guideline to configure it correctly.

Many thanks.

Regards,
Christopher

Hi Nikhil,

I try to set globalAlpha in tiovx/kernels_j7/hwa/display/vx_display_target.c by below code

            if (params->pipeId == 1) {
                displayParams->dispParams.alphaCfg.globalAlpha      = 0x80U;
                displayParams->dispParams.alphaCfg.preMultiplyAlpha = FALSE;
            }

And I can see the effect of alpha blending as below image

Just wondering if the effect of alpha blending is affected by globalAlpha value, not the 'A' value of RGB'A' format image buffer ?

And is it possible that each pixel have an individual alpha value?

Thank you.

Regards,

Christopher

Hi Christopher,

I think since the preMultiplyAlpha is set to false, the transperancy should be from the pixel alpha rather than global.

To confirm this, could you set the value of globalAlpha as 0xFF and check if you are getting a fully opaque triangle?
If it is opaque, then the global alpha is coming into effect, else it is pixel alpha

Regards,

Nikhil

Hi Nikhil,

The triangle is fully opaque under below setting: 

            if (params->pipeId == 1) {
                displayParams->dispParams.alphaCfg.globalAlpha      = 0xFF;
                displayParams->dispParams.alphaCfg.preMultiplyAlpha = FALSE;
            }

And if I try to set preMultiplyAlpha to TRUE, the triangle is still fully opaque.

Is it possible and how to get the effect from pixel alpha?

Thanks.

Regards,

Christopher

Hi Nikhil,

Thanks for the reply.

I saw some  register r/w apis like CPS_ReadReg32 in pdk_jacinto_08_05_00_36 but I have no idea how to use it.

Could you please provide some reference code or tools for DSS Register checking?

I will try to check the value during program is running.

By the way, I check the code in tiovx/kernels_j7/hwa/display/vx_display_target.c

    switch (obj_desc_img->format)
    {
        case (vx_df_image)TIVX_DF_IMAGE_RGB565:
            format->dataFormat = FVID2_DF_BGR16_565;
            format->pitch[FVID2_RGB_ADDR_IDX] = (uint32_t)obj_desc_img->imagepatch_addr[0].stride_y;
            dispPrms->bpp = 2;
            break;
        case (vx_df_image)VX_DF_IMAGE_RGB:
            format->dataFormat = FVID2_DF_RGB24_888;
            format->pitch[FVID2_RGB_ADDR_IDX] = (uint32_t)obj_desc_img->imagepatch_addr[0].stride_y;
            dispPrms->bpp = 3;
            break;
        case (vx_df_image)VX_DF_IMAGE_RGBX:
            format->dataFormat = FVID2_DF_RGBX24_8888;
            format->pitch[FVID2_RGB_ADDR_IDX] = (uint32_t)obj_desc_img->imagepatch_addr[0].stride_y;
            dispPrms->bpp = 4;
            break;
        case (vx_df_image)TIVX_DF_IMAGE_BGRX:
            format->dataFormat = FVID2_DF_BGRX32_8888;
            format->pitch[FVID2_RGB_ADDR_IDX] = (uint32_t)obj_desc_img->imagepatch_addr[0].stride_y;
            dispPrms->bpp = 4;
            break;
        case (vx_df_image)VX_DF_IMAGE_UYVY:
            format->dataFormat = FVID2_DF_YUV422I_UYVY;
            format->pitch[FVID2_YUV_INT_ADDR_IDX] = (uint32_t)obj_desc_img->imagepatch_addr[0].stride_y;
            dispPrms->bpp = 2;
            break;
        case (vx_df_image)VX_DF_IMAGE_YUYV:
            format->dataFormat = FVID2_DF_YUV422I_YUYV;
            format->pitch[FVID2_YUV_INT_ADDR_IDX] = (uint32_t)obj_desc_img->imagepatch_addr[0].stride_y;
            dispPrms->bpp = 2;
            break;
        case (vx_df_image)VX_DF_IMAGE_NV12:
            format->dataFormat = FVID2_DF_YUV420SP_UV;
            format->pitch[FVID2_YUV_SP_Y_ADDR_IDX] = (uint32_t)obj_desc_img->imagepatch_addr[0].stride_y;
            format->pitch[FVID2_YUV_SP_CBCR_ADDR_IDX] = (uint32_t)obj_desc_img->imagepatch_addr[1].stride_y;
            dispPrms->bpp = 1;
            break;
        case (vx_df_image)VX_DF_IMAGE_U16:
            format->ccsFormat = FVID2_CCSF_BITS12_UNPACKED16;
            format->dataFormat = FVID2_DF_YUV420SP_UV;
            format->pitch[FVID2_YUV_SP_Y_ADDR_IDX] = (uint32_t)obj_desc_img->imagepatch_addr[0].stride_y;
            format->pitch[FVID2_YUV_SP_CBCR_ADDR_IDX] = (uint32_t)obj_desc_img->imagepatch_addr[0].stride_y;
            dispPrms->bpp = 2;
            break;
        case (vx_df_image)VX_DF_IMAGE_U8:
            format->ccsFormat = FVID2_CCSF_BITS8_PACKED;
            format->dataFormat = FVID2_DF_YUV420SP_UV;
            format->pitch[FVID2_YUV_SP_Y_ADDR_IDX] = (uint32_t)obj_desc_img->imagepatch_addr[0].stride_y;
            format->pitch[FVID2_YUV_SP_CBCR_ADDR_IDX] = (uint32_t)obj_desc_img->imagepatch_addr[0].stride_y;
            dispPrms->bpp = 1;
            break;
        default:
            status = (vx_status)VX_FAILURE;
            break;
    }

It seems there is no case that dataFormat is set as FVID2_DF_RGBA32_8888

(The RTOS SDK I used is 8.5)

Thanks.

Regards,

Christopher

Hi Nikhil,

After modify  tiovx/kernels_j7/hwa/display/vx_display_target.c by following code, I can see the effect from pixel alpha

        case (vx_df_image)VX_DF_IMAGE_RGBX:
            //format->dataFormat = FVID2_DF_RGBX24_8888;
            format->dataFormat = FVID2_DF_RGBA32_8888;
            format->pitch[FVID2_RGB_ADDR_IDX] = (uint32_t)obj_desc_img->imagepatch_addr[0].stride_y;
            dispPrms->bpp = 4;

I think this ticket could be marked as resolved.

Thank you very much for the guidance.

And please still provide some guideline (APIs or tools) for checking registers, this will be very helpful for further debugging.

Thanks.

Regards,

Christopher

Hi Nikhil,

Got it and many thanks.

Regards,

Christopher