Linux/AM5728: Alpha blending formula used in DSS

kim yoochang

Intellectual 720 points

Part Number: AM5728

Tool/software: Linux

Hello,

We are using AM 5728 PSDK 3.01.00.06.

Currently, I am trying to alpha blend with plane and BackGround.

DSS (SrcA * SrcC) + ((1 - SrcA) * DestC) I thought that I confirmed it by using alpha blending formula.

Currently we are writing with 2DGPU and 3DGPU Alpha blending uses (1 * SrcC) + ((1 - SrcA) * DestC).

I am experiencing difficulties in developing different methods used in DSS and methods used in GPU.DSS alpha blending
Do you change it like alpha blending used with 2D, 3D GPU?

Thank you.

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

The software team have been notified. They will respond here.

0 Manisha Agrawal over 8 years ago in reply to Biser Gatchev-XID

TI__Mastermind 22936 points

Are you meaning to ask how to achieve alpha blending using DSS or are trying to compare the alpha blending output from GPU and DSS?

0 kim yoochang over 8 years ago in reply to Manisha Agrawal

Intellectual 720 points

We want toAlpha blending plane (VID) and Background.

I compared Alpha blending between GPU and DSS, but it is different.

It is the alpha blending we are using in GPU.

(1 * SrcC) + ((1 - SrcA) * DestC)

I would like to use the alpha blending of the GPU the same in DSS.

Thank you.

0 Manisha Agrawal over 8 years ago in reply to kim yoochang

TI__Mastermind 22936 points

The Alpha Blender in the DSS is doing “SRC_OVER” of PorterDuff composition -

Non-pre-multiplied: SrcA*SrcC + (1-SrcA)*DestC
Pre-multiplied: SrcC + (1-SrcA)*DestC

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Linux/AM5728: Alpha blending formula used in DSS