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Add colour to GtkDial level meters

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This commit is contained in:
Geoffrey D. Bennett
2024-02-08 21:30:21 +10:30
parent a26f607a8b
commit 3048b43b9a
3 changed files with 117 additions and 3 deletions
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22
src/window-levels.c
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@@ -9,6 +9,20 @@
#include "widget-gain.h"
#include "window-levels.h"
static const int level_breakpoints_out[] = { -80, -18, -12, -6, -3, -1 };
// inputs glow all-red when limit is reached
static const int level_breakpoints_in[] = { -80, -18, -12, -6, -3, 0 };
static const double level_colours[] = {
0.00, 1.00, 0.00, // -80
0.75, 1.00, 0.00, // -18
1.00, 1.00, 0.00, // -12
1.00, 0.75, 0.00, // -6
1.00, 0.50, 0.00, // -3
1.00, 0.00, 0.00 // -1/0
};
static int update_levels_controls(void *user_data) {
struct alsa_card *card = user_data;
@@ -104,6 +118,14 @@ GtkWidget *create_levels_controls(struct alsa_card *card) {
GtkWidget *meter = gtk_dial_new_with_range(-80, 0, 0, 0);
gtk_dial_set_taper(GTK_DIAL(meter), GTK_DIAL_TAPER_LINEAR);
gtk_dial_set_can_control(GTK_DIAL(meter), FALSE);
gtk_dial_set_level_meter_colours(
GTK_DIAL(meter),
(i == PC_DSP || i == PC_PCM)
? level_breakpoints_in
: level_breakpoints_out,
level_colours,
sizeof(level_breakpoints_out) / sizeof(int)
);
gtk_widget_set_sensitive(meter, FALSE);
// HW Output off_db is -55db; otherwise -45db