10:38 p.m.
On Mon, 05 Dec 2011 13:00:17 +0100,
<netsurf-dev-request(a)netsurf-browser.org> wrote:
No, it doesn't. It *will* match styles/weight when selecting the
appropriate initial font, but the substitution table is built without
paying attention to this information. As RISC OS fonts carry little
metadata about styles/weights, RUfl simply uses the font name as a
guide.
I don't quite follow this. What do you mean by "initial font" here? Sorry
if I'm being slow!
So, the substitution table is just a single mapping of UCS code point ->
one (of a possible many) fonts that contain a glyph for that code point?
Is the font chosen just the first one RUfl encounters (alphabetically?)
that has a match?
And what does RUfl take as hints to the font style from the name?
".Medium" and ".Bold", that kind of thing?
Many thanks,
WPB
1:26 a.m.
New subject: RUfl font substitution
On Mon, 2011-12-05 at 19:38 +0100, W P Blatchley wrote:
On Mon, 05 Dec 2011 13:00:17 +0100,
<netsurf-dev-request(a)netsurf-browser.org> wrote:
> No, it doesn't. It *will* match styles/weight when selecting the
> appropriate initial font, but the substitution table is built without
> paying attention to this information. As RISC OS fonts carry little
> metadata about styles/weights, RUfl simply uses the font name as a
> guide.
I don't quite follow this. What do you mean by "initial font" here? Sorry
if I'm being slow!
I mean the parameters passed to rufl_paint and friends (i.e. the font
face the client asks for)
So, the substitution table is just a single mapping of UCS code point
->
one (of a possible many) fonts that contain a glyph for that code point?
That's what I wrote, yes.
Is the font chosen just the first one RUfl encounters
(alphabetically?)
that has a match?
Pretty much, yes. See:
http://source.netsurf-browser.org/trunk/rufl/src/rufl_init.c?revision=979...
And what does RUfl take as hints to the font style from the name?
".Medium" and ".Bold", that kind of thing?
Yes.
See:
http://source.netsurf-browser.org/trunk/rufl/src/rufl_init.c?revision=979...
Patches to improve the situation are always welcome.
J.
5:18 p.m.
New subject: RUfl font substitution
On Mon, 05 Dec 2011 21:26:19 +0000
John-Mark Bell <jmb(a)netsurf-browser.org> wrote:
On Mon, 2011-12-05 at 19:38 +0100, W P Blatchley wrote:
> Is the font chosen just the first one RUfl encounters
> (alphabetically?) that has a match?
Pretty much, yes. See:
http://source.netsurf-browser.org/trunk/rufl/src/rufl_init.c?revision=979...
Just to explain the motivation behind this design: the substitution
table is 65K, and there are 18 weight-slant combinations. I wanted
RUfl to have small memory usage, so adding a table for each weight-
slant would have taken too much space. Perhaps a different data
structure or approach would be possible.
It wouldn't be difficult to construct the table in a different order
from alphabetical though.
James
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W P Blatchley