#2133 SCI_MARKERSETALPHA doesn't work for markers with type SC_MARK_BACKGROUND

[Jason Haslam]

When I try to call SCI_MARKERSETALPHA on a marker with type explicitly set to SC_MARK_BACKGROUND the marker no longer draws at all. The same does work for markers of any other type that implicitly draw the line background because the symbol margin is hidden.

[Neil Hodgson]

Here is a picture of SC_MARK_BACKGROUND with an alpha of 0x40.

It may depend on your platform or (edited: implicits do work, so platform is doing alpha) other settings.

[Jason Haslam]

I'm sorry. It also seems to depend on the margin settings. When I revert to the default margin settings with a symbol margin visible it works again. I suspect that it's the same condition that makes the other markers automatically switch to background markers.

[Neil Hodgson]

Its a complex case as it isn't drawn with the rest of the markers in LineMarker::Draw and depends on ViewStyle::Background instead. Possibly an issue with the masks calculated in ViewStyle::CalculateMarginWidthAndMask?

This is the code I use to experiment with markers in SciTE

function ShowAllIndicators()
    local lineStart = 371 -- Set this to number of line before SC_MARK_CIRCLE
    local markers = {

     SC_MARK_CIRCLE,
     SC_MARK_ROUNDRECT,
     SC_MARK_SMALLRECT,
     SC_MARK_SHORTARROW,
     SC_MARK_BOOKMARK,
     SC_MARK_VERTICALBOOKMARK,
     SC_MARK_FULLRECT,
     SC_MARK_LEFTRECT,
     SC_MARK_BACKGROUND,
     SC_MARK_UNDERLINE,
     SC_MARK_DOTDOTDOT,
     SC_MARK_ARROWS,
     SC_MARK_ARROW,
     SC_MARK_ARROWDOWN,
     SC_MARK_PLUS,
     SC_MARK_MINUS,
     SC_MARK_BOXPLUS,
     SC_MARK_BOXPLUSCONNECTED,
     SC_MARK_BOXMINUS,
     SC_MARK_BOXMINUSCONNECTED,
     SC_MARK_CIRCLEPLUS,
     SC_MARK_CIRCLEPLUSCONNECTED,
     SC_MARK_CIRCLEMINUS,
     SC_MARK_CIRCLEMINUSCONNECTED,
     SC_MARK_VLINE,
     SC_MARK_LCORNER,
     SC_MARK_TCORNER,
     SC_MARK_LCORNERCURVE,
     SC_MARK_TCORNERCURVE

    }
    editor.MarginMaskN[1] = 0x7fffffff
    local line = 0
    for i, v in ipairs(markers) do
        local m = v
        editor:MarkerDeleteAll(line)
        editor:MarkerDefine(line, m)
        editor.MarkerAlpha[line] = 0x30
        if m == SC_MARK_BOOKMARK or m == SC_MARK_VERTICALBOOKMARK or m == SC_MARK_LEFTRECT then
                editor.MarkerFore[line] = 0x0000BE
                editor.MarkerBack[line] = 0x4040E2
        elseif line < 16 then
                editor.MarkerFore[line] = 0x000000
                editor.MarkerBack[line] = 0x90D0A0
        else
                editor.MarkerFore[line] = 0xFFC0A0
                editor.MarkerBack[line] = 0x000000
        end
        editor:MarkerAdd(line+lineStart, line)
        line = line + 1
    end
end

That looks like this without a symbol margin:

[Jason Haslam]

Hmm... I'm not sure what's going on. I may try to dig a little deeper. It's not a high priority since I can work around it.

[Neil Hodgson]

Closing as it does work for me and there have been no more details to enable reproducing problem.