static gboolean
gimp_operation_posterize_process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi,
gint level)
{
GimpOperationPointFilter *point = GIMP_OPERATION_POINT_FILTER (operation);
GimpPosterizeConfig *config = GIMP_POSTERIZE_CONFIG (point->config);
gfloat *src = in_buf;
gfloat *dest = out_buf;
gfloat levels;
if (! config)
return FALSE;
levels = config->levels - 1.0;
while (samples--)
{
dest[RED] = RINT (src[RED] * levels) / levels;
dest[GREEN] = RINT (src[GREEN] * levels) / levels;
dest[BLUE] = RINT (src[BLUE] * levels) / levels;
dest[ALPHA] = src[ALPHA];
src += 4;
dest += 4;
}
return TRUE;
}
static void
gimp_posterize_tool_config_notify (GObject *object,
GParamSpec *pspec,
GimpPosterizeTool *posterize_tool)
{
GimpPosterizeConfig *config = GIMP_POSTERIZE_CONFIG (object);
if (! posterize_tool->levels_data)
return;
gtk_adjustment_set_value (posterize_tool->levels_data, config->levels);
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (posterize_tool));
}
static void
gimp_posterize_config_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpPosterizeConfig *self = GIMP_POSTERIZE_CONFIG (object);
switch (property_id)
{
case PROP_LEVELS:
self->levels = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
