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Original question:

Linux/AM5728: GC320 compositing issue

Linux/PROCESSOR-SDK-DRA7X: GC320 : Alpha blending with multi-source blitting

Divya B M
Prodigy 100 points
Part Number: PROCESSOR-SDK-DRA7X

Tool/software: Linux

Hi,

My application requires to support upto 4 overlays upon the base video. We are making use of GC320 module available on Jacinto6.
The input format is ARGB and output format is YUYV.
Is it possible to perform alpha blending of these overlays while using multi-source blitting?
Is there an existing sample application that we could refer for this use-case.

  • 0
    TI__Expert 3430 points

    Hi Divya.

    `git.ti.com/.../` is a repo that houses several examples on the usage of the API. There are few examples on the MultiSourceBlit and AlphaBlending usecases.

    Below is for MultiSourceBlit
    git.ti.com/graphics/ti-gc320-test/blobs/ti-5.0.11.p7/tests/src/test/hal/common/UnitTest/units/gal2D/blit/MultiSourceBlit

    Please take a look at these and see if these cover your scenario.

    Thanks,
    Gowtham

  • 0 in reply to Gowtham Tammana
    Prodigy 100 points

    Hi Gowtham,

    Thanks for your input. 

    The overlays can be of different dimension as compared to the base video.

    Will "gco2D_StretchBlit()" API help for rescaling the overlays as desired?

    Also, we need to have flexibiltiy of setting overlays at any co-ordinates on the base video. Will setting the appropriate rectangle co-ordinates for "gco2D_SetGenericSource()" before perfoming multi-source blit help?

    Thanks and Regards,

    Divya B M

  • 0 in reply to Divya B M
    TI__Expert 3430 points

    Hi Divya

    -0- on stretchblit

    `gco2D_StretchBlit()` can be used for rescaling.

    -1- on dynamic co-ordinates

    Multi-source blit expects same destination rectangle for the sources. If you
    have multiple-sources each with different destination rectangle you would have
    to perform *regionization* before doing multi-source blit. By *regionization*,
    you would divide the destination into rectangle of intersecting sources and
    perform sequence of blitting ops on those.

    Thanks,
    Gowtham

  • 0 in reply to Gowtham Tammana
    Prodigy 100 points

    Hi Gowtham,

    Thanks for your reply.

    Is there any sample application that we can refer to, for "regionization" you suggested for dynamic co-ordinates?

     

  • 0 in reply to Divya B M
    TI__Expert 3430 points

    Hi Divya,

    See attached for reference on doing composition by region using multi-source blit.

    Thanks,
    Gowtham

  • 0 in reply to Gowtham Tammana
    Prodigy 100 points

    Hi Gowtham,

    The attachment file which your comment refers to, seems to be missing.

    Can you please re-attach the same?

    Regards,

    Divya

  • 0 in reply to Divya B M
    TI__Expert 3430 points

    Hi Divya,

    I believe the application has been shared to you through email. If not let me know.

    Thanks,
    Gowtham

  • 0 in reply to Gowtham Tammana
    TI__Expert 3430 points

    Hi Divya,

    I believe this is now resolved, do let us know if you have any additional questions.

    Thanks,

    Gowtham