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Fix: Poor contrast in cargo dest flow legend window cargo labels.

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Select foreground colour depending on the brightness of the background.

Previously all cargo labels were rendered using black text, even
the background cargo colour was dark/black.
As an example: FIRS coal was black text on a black background.
This commit is contained in:
Jonathan G Rennison
2018-06-24 17:34:42 +01:00
committed by Michael Lutz
parent 7fed8fe004
commit 458bc90678
3 changed files with 6 additions and 5 deletions
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2
src/linkgraph/linkgraph_gui.cpp
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@@ -496,7 +496,7 @@ void LinkGraphLegendWindow::DrawWidget(const Rect &r, int widget) const
if (this->IsWidgetDisabled(widget)) return;
CargoSpec *cargo = CargoSpec::Get(widget - WID_LGL_CARGO_FIRST);
GfxFillRect(r.left + 2, r.top + 2, r.right - 2, r.bottom - 2, cargo->legend_colour);
DrawString(r.left, r.right, (r.top + r.bottom + 1 - FONT_HEIGHT_SMALL) / 2, cargo->abbrev, TC_BLACK, SA_HOR_CENTER);
DrawString(r.left, r.right, (r.top + r.bottom + 1 - FONT_HEIGHT_SMALL) / 2, cargo->abbrev, GetContrastColour(cargo->legend_colour, 73), SA_HOR_CENTER);
}
}