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term: only scale using DPI if *all* monitors have a scaling factor or one

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With dpi-aware=auto (the default), scale fonts using DPI *only*
if *all* available monitors have a scaling factor of one.

The idea is this: if a user, with multiple monitors, have enabled
scaling on *at least* one monitor, he/she has most likely done so to
match the size of his/hers other monitors.

For example, if the user has one monitor with a scaling factor of one,
and another one with a scaling factor of two, he/she expects things to
be twice as large on the second monitor.

If we (foot) scale using DPI on the first monitor, and using the
scaling factor on the second monitor, foot will *not* look twice as
big on the second monitor (this was the old behavior of
dpi-aware=auto).

Part of #714
This commit is contained in:
Daniel Eklöf 2021-09-19 11:58:34 +02:00
parent 2934a4e96c
commit fb77637eb9
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7 changed files with 59 additions and 27 deletions
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box-drawing.c
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@ -2837,8 +2837,8 @@ box_drawing(const struct terminal *term, wchar_t wc)
abort();
}
double dpi = term_font_sized_by_dpi(term, term->scale) ? term->font_dpi : 96.;
double scale = term_font_sized_by_scale(term, term->scale) ? term->scale : 1.;
double dpi = term->font_is_sized_by_dpi ? term->font_dpi : 96.;
double scale = term->font_is_sized_by_dpi ? 1. : term->scale;
double cell_size = sqrt(pow(term->cell_width, 2) + pow(term->cell_height, 2));
int base_thickness =