Re: FT_Bitmap_Convert, and FreeType's bitmap format vs Cairo's
Bill Spitzak <[email protected]>
| Newsgroups | gmane.comp.lib.cairo,gmane.comp.fonts.freetype.devel |
|---|---|
| Message-ID | <CAL-8oAgFi-MxXiNsc11Enhexj7sj=XiwcEF_6r90gPVLrQms1Q@mail.gmail.com> |
> Also I am wondering about a little drawing issue I have - I want to scale a freetype bitmap up and draw a larger version of it (useful for illustrations for rasterization issues...) but it seems that cairo always anti-alias the edges at the original resolution, and I haven't figured out how to turn it off yet. > Let's say, I have rendered a glyph to a 24x24 grid in FreeType, and want to draw that in cairo to 480 x 480 . I'd like cairo to render at the destination resolution - i.e. do whatever at the 1-pixel boundary in 480x480, but it seems that it is doing it in the original grid, which blows up to be extra blurry at ~20 pixels wide in 480x480. Here is how it looks (the corner S is original resolution drawn as is): > > http://htl10.users.sourceforge.net/tmp/S.png > > This is from a word-in-progress rewrite of freetype-py's glyph-alpha/glyph-monochrome examples which uses numpy and matplotlib, to using pycairo for drawing. Possibly you want to do cairo_patter_set_filter(source, CAIRO_FILTER_BEST) or CAIRO_FILTER_NEAREST (the difference is that BEST will actually antialias the boundaries between the pixels which looks nicer if the image is rotated or scaled by a non-integer). -- cairo mailing list [email protected] https://lists.cairographics.org/mailman/listinfo/cairo