[Kst] [Bug 114787] New: Transparent text not drawn properly

Andrew Walker arwalker at sumusltd.com
Thu Oct 20 23:26:39 CEST 2005

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           Summary: Transparent text not drawn properly
           Product: kst
           Version: unspecified
          Platform: Compiled Sources
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kst kde org
        ReportedBy: arwalker sumusltd com

Version:           HEAD (using KDE KDE 3.4.0)
Installed from:    Compiled From Sources
OS:                Linux

When a label is added to a plot with the transparent flag set the resulting text is drawn properly if, and only if, the background color of text happens to match the overall color of the plot on which it is drawn.

Create a new label on a plot that is predominantly white
Set the background color of the label to be red
Make the label transparent

The text is drawn with a red "halo" around the letters

No such "halo" is visible

The problem results from the use of createHeuristicMask() which is used to create a clip region. This leaves a region around each letter that is not clipped, as well as leaving regions within the central areas of letters such as ABDOPQR. These regions will be drawn in the background color of the label even though the label is transparent.

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