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gtk-demo: Compute HSV values directly

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This commit is contained in:
Benjamin Otte 2020-06-16 22:24:56 +02:00
parent bfdede7acc
commit 8348a113c6
1 changed files with 85 additions and 25 deletions
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110
demos/gtk-demo/listview_colors.c
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@ -84,6 +84,81 @@ G_DEFINE_TYPE_WITH_CODE (GtkColor, gtk_color, G_TYPE_OBJECT,
static GParamSpec *properties[N_PROPS] = { NULL, };
static void
rgb_to_hsv (GdkRGBA *rgba,
gdouble *h_out,
gdouble *s_out,
gdouble *v_out)
{
gdouble red, green, blue;
gdouble h, s, v;
gdouble min, max;
gdouble delta;
red = rgba->red;
green = rgba->green;
blue = rgba->blue;
h = 0.0;
if (red > green)
{
if (red > blue)
max = red;
else
max = blue;
if (green < blue)
min = green;
else
min = blue;
}
else
{
if (green > blue)
max = green;
else
max = blue;
if (red < blue)
min = red;
else
min = blue;
}
v = max;
if (max != 0.0)
s = (max - min) / max;
else
s = 0.0;
if (s == 0.0)
h = 0.0;
else
{
delta = max - min;
if (red == max)
h = (green - blue) / delta;
else if (green == max)
h = 2 + (blue - red) / delta;
else if (blue == max)
h = 4 + (red - green) / delta;
h /= 6.0;
if (h < 0.0)
h += 1.0;
else if (h > 1.0)
h -= 1.0;
}
*h_out = h;
*s_out = s;
*v_out = v;
}
static void
gtk_color_get_property (GObject *object,
guint property_id,
@ -143,6 +218,7 @@ gtk_color_set_property (GObject *object,
GParamSpec *pspec)
{
GtkColor *self = GTK_COLOR (object);
double h, s, v;
switch (property_id)
{
@ -152,18 +228,10 @@ gtk_color_set_property (GObject *object,
case PROP_COLOR:
self->color = *(GdkRGBA *) g_value_dup_boxed (value);
break;
case PROP_HUE:
self->h = g_value_get_int (value);
break;
case PROP_SATURATION:
self->s = g_value_get_int (value);
break;
case PROP_VALUE:
self->v = g_value_get_int (value);
rgb_to_hsv (&self->color, &h, &s, &v);
self->h = round (360 * h);
self->s = round (100 * s);
self->v = round (100 * v);
break;
case PROP_SELECTED:
@ -206,11 +274,11 @@ gtk_color_class_init (GtkColorClass *klass)
properties[PROP_BLUE] =
g_param_spec_float ("blue", NULL, NULL, 0, 1, 0, G_PARAM_READABLE);
properties[PROP_HUE] =
g_param_spec_int ("hue", NULL, NULL, 0, 360, 0, G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY);
g_param_spec_int ("hue", NULL, NULL, 0, 360, 0, G_PARAM_READABLE);
properties[PROP_SATURATION] =
g_param_spec_int ("saturation", NULL, NULL, 0, 100, 0, G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY);
g_param_spec_int ("saturation", NULL, NULL, 0, 100, 0, G_PARAM_READABLE);
properties[PROP_VALUE] =
g_param_spec_int ("value", NULL, NULL, 0, 100, 0, G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY);
g_param_spec_int ("value", NULL, NULL, 0, 100, 0, G_PARAM_READABLE);
properties[PROP_SELECTED] =
g_param_spec_boolean ("selected", NULL, NULL, FALSE, G_PARAM_READWRITE);
@ -224,8 +292,7 @@ gtk_color_init (GtkColor *self)
static GtkColor *
gtk_color_new (const char *name,
float r, float g, float b,
int h, int s, int v)
float r, float g, float b)
{
GtkColor *result;
GdkRGBA color = { r, g, b, 1.0 };
@ -233,9 +300,6 @@ gtk_color_new (const char *name,
result = g_object_new (GTK_TYPE_COLOR,
"name", name,
"color", &color,
"hue", h,
"saturation", s,
"value", v,
NULL);
return result;
@ -259,7 +323,6 @@ create_colors_model (void)
const char *name;
char **fields;
int red, green, blue;
int h, s, v;
if (lines[i][0] == '#' || lines[i][0] == '\0')
continue;
@ -269,11 +332,8 @@ create_colors_model (void)
red = atoi (fields[3]);
green = atoi (fields[4]);
blue = atoi (fields[5]);
h = atoi (fields[9]);
s = atoi (fields[10]);
v = atoi (fields[11]);
color = gtk_color_new (name, red / 255., green / 255., blue / 255., h, s, v);
color = gtk_color_new (name, red / 255., green / 255., blue / 255.);
g_list_store_append (result, color);
g_object_unref (color);