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  1. Qt
  2. QTBUG-80284

OptimizeRenderList Taking up to 30% of cycles in SW-Rendering, QRegion to blame

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    Details

    • Type: Bug
    • Status: Reported
    • Priority: P3: Somewhat important
    • Resolution: Unresolved
    • Affects Version/s: 5.15
    • Fix Version/s: None
    • Component/s: Quick: 2D Renderer
    • Labels:
    • Environment:
      Measured on Linux, SW-Renderer Backend
    • Platform/s:
      All

      Description

      When selecting the Software backend for rendering, QAbstractSoftwareRenderer::optimizeRenderList can take up to 30% of your rendering costs.

      See an attached Screenshot from a 5.13.2 build, filtered for runtime (scrolling), startup omitted in an undisclosed QML application.

      See how optimizeRenderList as well as renderNodes() suffers mainly from the QRegion ops
      {{QRegion::operator+=(const QRegion& ) }}
      and
      {{ QRegion::intersected(const QRect&) }}

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            • Assignee:
              christoph.sterz Christoph Sterz
              Reporter:
              christoph.sterz Christoph Sterz
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              Dates

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                Updated:

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