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pt-or-px: heed the dpi-aware setting

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Before this patch, pt-or-px values, like letter-spacing, were *always*
scaled using the current DPI value.

This is wrong; if the fonts are scaled using the output’s scaling
factor, then so should all other point values.

This also fixes an issue where e.g. letter-spacing would use one DPI
value at startup, but then when increasing/decreasing or resetting the
font size, would be re-calculated using a different DPI value, leading
to completely different spacing.

This happened when there were multiple monitors, with different DPI
values, and foot guessed the initial DPI value wrong. Normally, foot
would correct itself as soon as the window was mapped, and the
“correct” DPI value known. But if the fonts were scaled using the
scaling factor, it was possible that the font reload never happened.

This patch also updates the thickness calculation (for LIGHT and HEAVY
box drawing characters) to use the scaling factor when appropriate.

Closes #680
This commit is contained in:
Daniel Eklöf 2021-08-13 17:38:56 +02:00
parent a37109e5f6
commit f6f8f2b35e
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4 changed files with 62 additions and 46 deletions
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3
terminal.h
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@ -643,6 +643,9 @@ bool term_font_size_decrease(struct terminal *term);
bool term_font_size_reset(struct terminal *term);
bool term_font_dpi_changed(struct terminal *term, int old_scale);
void term_font_subpixel_changed(struct terminal *term);
bool term_font_sized_by_dpi(const struct terminal *term, int scale);
bool term_font_sized_by_scale(const struct terminal *term, int scale);
int term_pt_or_px_as_pixels(
const struct terminal *term, const struct pt_or_px *pt_or_px);