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Some imp docs for subpixel rendering

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git-svn-id: svn://ultimatepp.org/upp/trunk@900 f0d560ea-af0d-0410-9eb7-867de7ffcac7
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cxl 2009-02-23 18:01:40 +00:00
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uppsrc/Painter/srcimp.tpp/SubpixelFiller$en-us.tpp
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@ -8,10 +8,22 @@ topic "";
[s1;%- &]
[s2;:SubpixelFiller`:`:Write`(int`):%- [@(0.0.255) void]_[* Write]([@(0.0.255) int]_[*@3 len])
&]
[s3; This function flushes the content of filtered subpixel buffer.&]
[s0; Important note: due to rounding errors during filtering, sometimes
[s3; This function writes the filtered subpixel buffer to RGBA output,
performing per`-channel (subpixel) alpha blending. Note that
it is only possible to do correct per`-channel blending when
target is opaque (a `=`= 255). If it is not, normal anti`-aliasing
is used, using average.&]
[s3; Important note: due to rounding errors during filtering, sometimes
the subpixel value can be 257. This is remedied by using 257
instead of 256 in the pixel blending command.&]
[s0; &]
[s4; &]
[s1;%- &]
[s2;:SubpixelFiller`:`:RenderN`(int`,int`,int`):%- [@(0.0.255) void]_[* RenderN]([@(0.0.255) i
nt]_[*@3 val], [@(0.0.255) int]_[*@3 h], [@(0.0.255) int]_[*@3 n])&]
[s3; This function adds 1 `- 6 val values to filtered subpixel buffer
in single pass (6 is just enough needed for Render optimizations).
Case variants are created by adding shifted Render filtering
procedures.&]
[s4; &]
[s0; ]