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/* sp-color-cycle.c
*
* Copyright (C) 2016 Christian Hergert <chergert@redhat.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define G_LOG_DOMAIN "sp-color-cycle"
#include "util/sp-color-cycle.h"
G_DEFINE_BOXED_TYPE (SpColorCycle, sp_color_cycle, sp_color_cycle_ref, sp_color_cycle_unref)
static const gchar *default_colors[] = {
"#73d216",
"#f57900",
"#3465a4",
"#ef2929",
"#75507b",
"#ce5c00",
"#c17d11",
"#cc0000",
"#edd400",
"#555753",
"#4e9a06",
"#204a87",
"#5c3566",
"#a40000",
"#c4a000",
"#8f5902",
"#2e3436",
"#8ae234",
"#729fcf",
"#ad7fa8",
"#fce94f",
"#fcaf3e",
"#e9b96e",
"#888a85",
NULL
};
struct _SpColorCycle
{
volatile gint ref_count;
GdkRGBA *colors;
gsize n_colors;
guint position;
};
static void
sp_color_cycle_destroy (SpColorCycle *self)
{
g_free (self->colors);
g_slice_free (SpColorCycle, self);
}
SpColorCycle *
sp_color_cycle_new (void)
{
SpColorCycle *self;
self = g_slice_new0 (SpColorCycle);
self->ref_count = 1;
self->n_colors = g_strv_length ((gchar **)default_colors);
self->colors = g_new0 (GdkRGBA, self->n_colors);
for (guint i = 0; default_colors[i]; i++)
{
if G_UNLIKELY (!gdk_rgba_parse (&self->colors[i], default_colors[i]))
g_warning ("Failed to parse color %s into an RGBA", default_colors[i]);
}
return self;
}
SpColorCycle *
sp_color_cycle_ref (SpColorCycle *self)
{
g_return_val_if_fail (self != NULL, NULL);
g_return_val_if_fail (self->ref_count > 0, NULL);
g_atomic_int_inc (&self->ref_count);
return self;
}
void
sp_color_cycle_unref (SpColorCycle *self)
{
g_return_if_fail (self != NULL);
g_return_if_fail (self->ref_count > 0);
if (g_atomic_int_dec_and_test (&self->ref_count))
sp_color_cycle_destroy (self);
}
void
sp_color_cycle_next (SpColorCycle *self,
GdkRGBA *rgba)
{
g_return_if_fail (self != NULL);
g_return_if_fail (self->position < self->n_colors);
*rgba = self->colors[self->position];
/*
* TODO: Adjust color HSV/etc
*
* We could simply adjust the brightness/etc after we dispatch
* a color so that we get darker as we go.
*/
self->position = (self->position + 1) % self->n_colors;
}
void
sp_color_cycle_reset (SpColorCycle *self)
{
g_return_if_fail (self != NULL);
for (guint i = 0; default_colors[i]; i++)
{
if G_UNLIKELY (!gdk_rgba_parse (&self->colors[i], default_colors[i]))
g_warning ("Failed to parse color %s into an RGBA", default_colors[i]);
}
self->position = 0;
}
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