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term: implement term_font_dpi_changed()

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This function reloads the font *if* the DPI has changed. To handle
user run-time adjusted font sizes, we record the number of adjustments
made.

Then, when re-loading the font, we first load the font as specified in
the configuration. Then, we re-apply the size adjustment using
font_size_adjust().

Note that this means we end up loading the fonts twice; first using
the default size (but with adjusted DPI), and then again with the
adjusted size. This can probably be improved upon.

The existing font code has been refactored to avoid code
duplication. For example, term_init() now calls
term_font_dpi_changed() to load the initial fonts, instead of directly
instantiating them.

Finally, the way we calculate the DPI to use has changed: instead of
using the highest DPI of all available outputs, we use the highest DPI
of the output's we're actually mapped on. If we're not mapped at all,
we use the globally highest DPI.

Doing it this way means we usually only have to load the fonts
once. Otherwise, we'd end up using the default DPI of 96 when the
terminal is first instantiated (since it's not mapped at that time).

On a single monitor system, we'll use the globally highest DPI at
first, before being mapped. Then when we get mapped, we re-load the
fonts using the highest mapped DPI. But since they'll be the same,
we can skip actually reloading the fonts.
This commit is contained in:
Daniel Eklöf 2020-02-15 19:08:14 +01:00
parent 027696e9c6
commit 4d3ab6176d
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GPG key ID: 5BBD4992C116573F
2 changed files with 147 additions and 56 deletions
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9
terminal.h
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@ -187,6 +187,8 @@ struct terminal {
struct grid *grid;
struct font *fonts[4];
int font_dpi;
int font_adjustments;
tll(struct ptmx_buffer) ptmx_buffer;
@ -364,9 +366,10 @@ int term_destroy(struct terminal *term);
void term_reset(struct terminal *term, bool hard);
bool term_to_slave(struct terminal *term, const void *data, size_t len);
void term_font_size_increase(struct terminal *term);
void term_font_size_decrease(struct terminal *term);
void term_font_size_reset(struct terminal *term);
bool term_font_size_increase(struct terminal *term);
bool term_font_size_decrease(struct terminal *term);
bool term_font_size_reset(struct terminal *term);
bool term_font_dpi_changed(struct terminal *term);
void term_damage_rows(struct terminal *term, int start, int end);
void term_damage_rows_in_view(struct terminal *term, int start, int end);