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render: whole-window transparency when unfocused

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This adds a new option, colors.unfocused-alpha. When set to a value <
1.0, the entire window (*everything* - all bg/fg colors, images etc)
are made transparent while the window does not have keyboard focus.

The way this is implemented (trying to keep the patch small), we need
to do full-screen repaints while in this mode.

That is, all screen updates result in full-screen repaints when:

* The window does not have keyboard focus
* The window *just* gained keyboard focus (i.e. last frame was
  rendered with transparency)

As such, one can expect a fairly large performance impact when there’s
large amount of output while the window is unfocused.

Focused windows are unaffected, as are unfocused windows when
colors.unfocused-alpha == 1.0.
This commit is contained in:
Daniel Eklöf 2021-08-11 17:36:42 +02:00
parent 2fbc336eb9
commit 9013a810f1
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GPG key ID: 5BBD4992C116573F
7 changed files with 57 additions and 0 deletions
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13
config.c
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@ -1359,6 +1359,18 @@ parse_section_colors(const char *key, const char *value, struct config *conf,
return true;
}
else if (strcmp(key, "unfocused-alpha") == 0) {
double alpha;
if (!str_to_double(value, &alpha) || alpha < 0. || alpha > 1.) {
LOG_AND_NOTIFY_ERR("%s:%d: [colors]: unfocused-alpha: expected a value in the range 0.0-1.0",
path, lineno);
return false;
}
conf->colors.unfocused_alpha = alpha * 65535.;
return true;
}
else {
LOG_AND_NOTIFY_ERR("%s:%d: [colors]: %s: invalid key", path, lineno, key);
return false;
@ -2940,6 +2952,7 @@ config_load(struct config *conf, const char *conf_path,
.fg = default_foreground,
.bg = default_background,
.alpha = 0xffff,
.unfocused_alpha = 0xffff,
.selection_fg = 0x80000000, /* Use default bg */
.selection_bg = 0x80000000, /* Use default fg */
.use_custom = {