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Turn on hinting and subpixel rendering for Cairo.

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There's no good reason not to enable subpixel rendering and hinting.
Leaving it off makes GNUstep apps look worse than everything else, in
exchange for having -advancementForGlyph: be totally consistent, which
may not even be necessary.

So, yeah, let's just turn this stuff on. I reused the subpixel default
from back-art to preserve configs, and added a GSFontHinting default to
control text hinting.

Use 0 for whatever Cairo defaults to, 1 for off, 2 for slight hinting,
3 for medium hinting, or 4 for full hinting.
This commit is contained in:
Jeff Teunissen 2019-03-25 03:50:10 -04:00
parent 0578a7d915
commit f87842d08a
1 changed files with 46 additions and 10 deletions
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56
Source/cairo/CairoFontInfo.m
View file

@ -51,6 +51,10 @@
cairo_matrix_t font_matrix;
cairo_matrix_t ctm;
cairo_font_options_t *options;
cairo_hint_metrics_t metrics = CAIRO_HINT_METRICS_ON;
cairo_hint_style_t style = CAIRO_HINT_STYLE_DEFAULT;
NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
int hinting = 0, subpixel = 0;
if (![super setupAttributes])
{
@ -78,16 +82,48 @@
return NO;
}
// We must not leave the hinting settings as their defaults,
// because if we did, that would mean using the surface defaults
// which might or might not use hinting (xlib does by default.)
//
// Since we make measurements outside of the context of a surface
// (-advancementForGlyph:), we need to ensure that the same
// hinting settings are used there as when we draw. For now,
// just force hinting to be off.
cairo_font_options_set_hint_metrics(options, CAIRO_HINT_METRICS_ON);
cairo_font_options_set_hint_style(options, CAIRO_HINT_STYLE_NONE);
if ((hinting = [ud integerForKey: @"GSFontHinting"]))
{ /*
* This part is only here to debug disabling the use of hinting for
* metrics, because doing so causes menus to get cut off on the right.
*/
switch (hinting >> 4)
{
case 1:
metrics = CAIRO_HINT_METRICS_OFF;
break;
case 2:
metrics = CAIRO_HINT_METRICS_ON;
break;
}
switch (hinting & 0x0f)
{
case 1:
style = CAIRO_HINT_STYLE_NONE;
break;
case 2:
style = CAIRO_HINT_STYLE_SLIGHT;
break;
case 3:
style = CAIRO_HINT_STYLE_MEDIUM;
break;
case 4:
style = CAIRO_HINT_STYLE_FULL;
break;
}
}
cairo_font_options_set_hint_metrics(options, metrics);
cairo_font_options_set_hint_style(options, style);
if ((subpixel = [ud integerForKey: @"back-art-subpixel-text"]))
{
cairo_font_options_set_antialias(options, CAIRO_ANTIALIAS_SUBPIXEL);
cairo_font_options_set_subpixel_order(options, CAIRO_SUBPIXEL_ORDER_RGB);
if (subpixel == 2)
cairo_font_options_set_subpixel_order(options, CAIRO_SUBPIXEL_ORDER_BGR);
}
_scaled = cairo_scaled_font_create(face, &font_matrix, &ctm, options);
cairo_font_options_destroy(options);