Hello guys,
Couple of issues with AA in gui/back
1) I noticed that the GSFontAntiAlias option the system preferences has no
effect on the font anti aliasing. This seems to be broken at least for the
Cairo backend.
2) NSGraphicsContext setShouldAntialias: API is not implemented, it just
sets a BOOL value but it seems not to be in use. Also its C wrapper is
missing from the C API list (like DPSshow() has a stanalone C wrapper).
I suppose for 1) we need to set the font property if the flag is set.
As for 2) we need to make setShouldAntialias tell the backend to disable
the anti alias for strokes and for fonts.
Here is some sample code to disable anti alias font drawing for the cairo
backend:
cairo_font_options_t *options = cairo_font_options_create();
cairo_get_font_options(_ct, options);
cairo_font_options_set_antialias (options, CAIRO_ANTIALIAS_NONE);
cairo_set_font_options (_ct, options);
I tested it on DPSshow in CairoGState.m + Terminal.app (since it uses the
API to render the text of the terminal). However IDK where this code should
live.
I tried adding this code to the DPScurrentlinewidth API and then calling
as follows:
[gs DPScurrentlinewidth:3.0];
[gc DPSshow:"Is this antialiased? "];
Unfortunately the font options seem to reset and DPSshow is back to having
AA enabled. I wanted to know if the Graphics Context would persist the
state, and its not doing that. It seems costly to have to disable font AA
for every call to draw text.
As for strokes, the API should be cairo_set_antialias.
Do you guys know who is the maintainer of gnustep back?
Thanks
Luis
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