Artifact on a certain glyph
bluebear94 opened this issue · 4 comments
To reproduce: Save the following as shape.txt:
{
26.3125, 9.5625;
m;
26.6875, 9.5625;
c;
26.6875, 4.8125;
m;
31.9375, 4.8125;
y;
31.9375, 27.8125;
y(31.9375, 38.90625; 23.46875, 40.1875);
19, 40.1875;
y(13.75, 40.1875; 7.75, 38.34375);
5, 32;
m;
10.125, 30.1875;
c(11.28125, 32.71875; 14.09375, 35.4375);
19.1875, 35.4375;
c(24.125, 35.4375; 26.625, 32.84375);
26.625, 28.375;
c;
26.625, 28.1875;
c(26.625, 25.59375; 23.9375, 25.8125);
17.5625, 25;
c(11.09375, 24.15625; 4, 22.71875);
4, 14.75;
c(4, 7.90625; 9.28125, 4);
15.9375, 4;
c(22.03125, 4; 25.21875, 7.28125);
#
}
{
26.625, 22.375;
m;
26.625, 17.4375;
m(26.625, 13.09375; 23.125, 8.8125);
16.75, 8.8125;
y(12.46875, 8.8125; 9.375, 10.71875);
9.375, 14.4375;
c(9.375, 18.53125; 13.125, 19.8125);
17.3125, 20.375;
c(19.5625, 20.625; 25.71875, 21.28125);
#
}
(Taken from the a glyph in Inter. For various reasons, this isn’t reproducible by letting msdfgen load the glyph from the font file.)
Run:
./msdfgen msdf -shapedesc shape.txt -size 36 45 -testrender preview.png 360 450
When the resulting distance field is rendered, there is an artifact near the tail of the a:
The artifact is less pronounced when -scale 0.99 or -scale 1.01 is passed in.
having similar issue with some letters
Font:
https://www.fontsquirrel.com/fonts/open-sans "OpenSans-Regular.ttf"
Command:
msdfgen.exe -font OpenSans-Regular.ttf 'M' -size 32 32 -testrender test.png 128 128
Output:
Render:
I have also been having some rendering glitches on symbols.
I have attached a shape file with the problematic symbol.
I don't use Skia, so I use the flag -nopreprocess, although there are different artefacts when using Skia.
I use a resolution of 126 by 126 to render this symbol.
I also don't use -autoframe.
There are limitations that prevent me from changing the resolution or from using -autoframe in my software environment.
msdfgen.exe -shapedesc shape_61498.shape -size 126 126 -testrender render.png 126 126 -testrendermulti output.png 126 126 -nopreprocess
@AndrewPech6-dev If you don't use Skia preprocess, then you have to pass in a shape without self intersections:
But yes, distance fields can't deal very well with these angles:
Thank you, I did not see that intersection. I have other intersection tools that I can use to resolve this.
Thanks for the quick response, I'll know what to look for next time I come across similar issues.