From: Carlos Pita <carlosjosepita@gmail.com>
To: 37752@debbugs.gnu.org
Subject: bug#37752: Scaling factor inconsistencies between X with and without GTK
Date: Mon, 14 Oct 2019 21:21:54 -0300 [thread overview]
Message-ID: <CAELgYheD=Z3__BQntdiiRNmuNAgi0M+MS8wJcpowv_47JJ7kaA@mail.gmail.com> (raw)
In many places in xterm.c you have code like:
#ifdef USE_GTK
scale = xg_get_scale (f);
#endif
Sometimes scale is only used in GTK specific code and that's ok.
But sometimes it's used in code that's not particular to GTK, for example:
int scale = 1;
#ifdef USE_GTK
scale = xg_get_scale (f);
#endif
FRAME_CR_SURFACE (f) =
cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
scale * FRAME_PIXEL_WIDTH (f),
scale * FRAME_PIXEL_HEIGHT (f));
Besides, there is x_get_scale_factor, also defined in xterm.c, which
computes the scaling factor in a GTK-independent way, and also
discriminates between x and y scaling factors. It's only used by
x_draw_underwave.
I would like to abstract both cases inside x_get_scale_factor, that
would then use xg_get_scale if in GTK or compute just one scaling
factor (for x or for y) otherwise. Notice that given that the scaling
factor is the ratio of the effective resolution to a base resolution
of 96 dpi *truncated down* to the nearest integer, AFAICS it's almost
impossible to get different scaling factors for x and for y.
What do you think?
Best regards
--
Carlos
next reply other threads:[~2019-10-15 0:21 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-15 0:21 Carlos Pita [this message]
2019-10-15 7:56 ` bug#37752: Scaling factor inconsistencies between X with and without GTK Robert Pluim
2019-10-15 8:09 ` Carlos Pita
2019-10-15 9:37 ` Robert Pluim
2019-10-15 22:40 ` Carlos Pita
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