GObject *
gimp_curves_config_new_explicit (gint32 channel,
const gdouble *samples,
gint n_samples)
{
GimpCurvesConfig *config;
GimpCurve *curve;
gint i;
g_return_val_if_fail (channel >= GIMP_HISTOGRAM_VALUE &&
channel <= GIMP_HISTOGRAM_ALPHA, NULL);
g_return_val_if_fail (samples != NULL, NULL);
g_return_val_if_fail (n_samples >= 2 && n_samples <= 4096, NULL);
config = g_object_new (GIMP_TYPE_CURVES_CONFIG, NULL);
curve = config->curve[channel];
gimp_data_freeze (GIMP_DATA (curve));
gimp_curve_set_curve_type (curve, GIMP_CURVE_FREE);
gimp_curve_set_n_samples (curve, n_samples);
for (i = 0; i < n_samples; i++)
gimp_curve_set_curve (curve,
(gdouble) i / (gdouble) (n_samples - 1),
(gdouble) samples[i]);
gimp_data_thaw (GIMP_DATA (curve));
return G_OBJECT (config);
}
void
gimp_drawable_curves_explicit (GimpDrawable *drawable,
GimpProgress *progress,
gint32 channel,
const guint8 *points,
gint n_points)
{
GimpCurvesConfig *config;
GimpCurve *curve;
gint i;
g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
g_return_if_fail (! gimp_drawable_is_indexed (drawable));
g_return_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)));
g_return_if_fail (channel >= GIMP_HISTOGRAM_VALUE &&
channel <= GIMP_HISTOGRAM_ALPHA);
if (channel == GIMP_HISTOGRAM_ALPHA)
g_return_if_fail (gimp_drawable_has_alpha (drawable));
if (gimp_drawable_is_gray (drawable))
g_return_if_fail (channel == GIMP_HISTOGRAM_VALUE ||
channel == GIMP_HISTOGRAM_ALPHA);
config = g_object_new (GIMP_TYPE_CURVES_CONFIG, NULL);
curve = config->curve[channel];
gimp_data_freeze (GIMP_DATA (curve));
gimp_curve_set_curve_type (curve, GIMP_CURVE_FREE);
for (i = 0; i < 256; i++)
gimp_curve_set_curve (curve,
(gdouble) i / 255.0,
(gdouble) points[i] / 255.0);
gimp_data_thaw (GIMP_DATA (curve));
gimp_drawable_curves (drawable, progress, config);
g_object_unref (config);
}