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Doesn't change the outcome but looks better to read
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As it turns out, the algorithm for drawing convex polygons is very bad
at handling aliasing, and the line height looked off as well. The new
algorithm fixes the issue by first drawing a horizontal filled
rectangle, then rotating the rectangle by the required angle (using
bicubic filtering) and finally overlaying the rectangle onto the target.
This improves both the looks of the line height and the aliasing
effects.
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Apparently, turning the picture to grayscale also messes with the alpha
channel. A lot of trait icons have a small transparent border though.
Therefore, we want to preserve the alpha channel by copying it back from
the original trait icon. This improves render quality and removes some
of the artifacts.
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