[Libreoffice-bugs] [Bug 142394] New: Slow drawing of semi-transparent large color object

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=142394

            Bug ID: 142394
           Summary: Slow drawing of semi-transparent large color object
           Product: LibreOffice
           Version: 7.2.0.0.alpha0+ Master
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: graphics stack
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: l.lunak at collabora.com
                CC: Armin.Le.Grand at me.com

Created attachment 172198
  --> https://bugs.documentfoundation.org/attachment.cgi?id=172198&action=edit
testcase

The attached document has a full-page graphic object that is slow to draw when
using e.g. mouse-wheel to scroll up and down.

It is especially noticeable when using gtk3 VCL backend. The primary cost seems
to be in VclProcessor2D::RenderFillGraphicPrimitive2D(), where it draws the
object using ~10k tiny bitmaps.

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