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Change the default ANTI_ALIAS_FACTOR for documentation builds to 1
This was previously set to 2. The speedup when building Documentation
directly in the right scale is not much, however. After issue 2658,
stem thickness variation has been improved enough to make this
feasible.
The result is that the images in general are quite crisper: at
ANTI_ALIAS_FACTOR=2, there is a uniform impression of fuzziness and
features tend to be fattened. Rendering at correct size clears much
of the fuzziness. Overall stem weight still appears uniform, but the
variation in appearance between lines rasterizing well and those
between the raster (consequently rendering fuzzier) is more
pronounced. In particular slightly inclined beams exhibit more
staircasing artifacts.
I consider the overall appearance a definite improvement, but the
absence of blurring also makes the images less forgiving regarding
rasterization effects.
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