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settings: Add CLUTTER_DPI_SCALE

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Like we do for the windowing surfaces, we should have a run time knob
(in the form of an environment variable) to allow changing the scaling
factor of the font resolution.
This commit is contained in:
Emmanuele Bassi 2014-01-22 01:24:16 +00:00
parent 30d1e47c4e
commit 696a536b26
1 changed files with 13 additions and 0 deletions
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13
clutter/clutter-settings.c
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@ -205,6 +205,8 @@ settings_update_font_name (ClutterSettings *self)
static void
settings_update_resolution (ClutterSettings *self)
{
const char *scale_env = NULL;
if (self->unscaled_font_dpi > 0)
self->resolution = (gdouble) self->unscaled_font_dpi / 1024.0;
else if (self->font_dpi > 0)
@ -212,6 +214,14 @@ settings_update_resolution (ClutterSettings *self)
else
self->resolution = 96.0;
scale_env = g_getenv ("GDK_DPI_SCALE");
if (scale_env != NULL)
{
double scale = g_ascii_strtod (scale_env, NULL);
if (scale != 0 && self->resolution > 0)
self->resolution *= scale;
}
CLUTTER_NOTE (BACKEND, "New resolution: %.2f (%s)",
self->resolution,
self->unscaled_font_dpi > 0 ? "unscaled" : "scaled");
@ -706,6 +716,9 @@ clutter_settings_init (ClutterSettings *self)
self->resolution = -1.0;
self->font_dpi = -1;
self->unscaled_font_dpi = -1;
self->double_click_time = 250;
self->double_click_distance = 5;