ubuntu-sdk-bugs team mailing list archive

[Loïc Molinari <loic.molinari@xxxxxxxxxxxxx>]

Public bug reported:

The MainView renders at the bottom-most layer a background composed of a
colored rectangle and an image. The way it is currently implemented
implies two fullscreen passes with alpha blending on. This is very slow.
A solution would be to use just one pass using a ShaderEffect or a
dedicated C++ component. Disabling alpha blending (possible since it's
the bottom-most layer) would also provide a good performance boost.
Another idea, if no image needs to be rendered, would be to simply set
the GPU clear color to the background color, to render it for free.

** Affects: ubuntu-ui-toolkit (Ubuntu)
     Importance: High
     Assignee: Loïc Molinari (loic.molinari)
         Status: Confirmed

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https://bugs.launchpad.net/bugs/1439133

Title:
  [MainView] Background color and image rendering is too slow

Status in ubuntu-ui-toolkit package in Ubuntu:
  Confirmed

Bug description:
  The MainView renders at the bottom-most layer a background composed of
  a colored rectangle and an image. The way it is currently implemented
  implies two fullscreen passes with alpha blending on. This is very
  slow. A solution would be to use just one pass using a ShaderEffect or
  a dedicated C++ component. Disabling alpha blending (possible since
  it's the bottom-most layer) would also provide a good performance
  boost. Another idea, if no image needs to be rendered, would be to
  simply set the GPU clear color to the background color, to render it
  for free.

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