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-rw-r--r--app/operations/gimpoperationthreshold.c232
1 files changed, 232 insertions, 0 deletions
diff --git a/app/operations/gimpoperationthreshold.c b/app/operations/gimpoperationthreshold.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationthreshold.c
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * 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 <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpconfig/gimpconfig.h"
+
+#include "operations-types.h"
+
+#include "gimpoperationthreshold.h"
+
+#include "gimp-intl.h"
+
+
+enum
+{
+ PROP_0,
+ PROP_CHANNEL,
+ PROP_LOW,
+ PROP_HIGH
+};
+
+
+static void gimp_operation_threshold_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+static void gimp_operation_threshold_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+
+static gboolean gimp_operation_threshold_process (GeglOperation *operation,
+ void *in_buf,
+ void *out_buf,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level);
+
+
+G_DEFINE_TYPE (GimpOperationThreshold, gimp_operation_threshold,
+ GIMP_TYPE_OPERATION_POINT_FILTER)
+
+#define parent_class gimp_operation_threshold_parent_class
+
+
+static void
+gimp_operation_threshold_class_init (GimpOperationThresholdClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
+ GeglOperationPointFilterClass *point_class = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
+
+ object_class->set_property = gimp_operation_threshold_set_property;
+ object_class->get_property = gimp_operation_threshold_get_property;
+
+ point_class->process = gimp_operation_threshold_process;
+
+ gegl_operation_class_set_keys (operation_class,
+ "name", "gimp:threshold",
+ "categories", "color",
+ "description", _("Reduce image to two colors using a threshold"),
+ NULL);
+
+ GIMP_CONFIG_PROP_ENUM (object_class, PROP_CHANNEL,
+ "channel",
+ _("Channel"),
+ NULL,
+ GIMP_TYPE_HISTOGRAM_CHANNEL,
+ GIMP_HISTOGRAM_VALUE,
+ GIMP_PARAM_STATIC_STRINGS);
+
+ GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_LOW,
+ "low",
+ _("Low threshold"),
+ NULL,
+ 0.0, 1.0, 0.5,
+ GIMP_PARAM_STATIC_STRINGS);
+
+ GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_HIGH,
+ "high",
+ _("High threshold"),
+ NULL,
+ 0.0, 1.0, 1.0,
+ GIMP_PARAM_STATIC_STRINGS);
+}
+
+static void
+gimp_operation_threshold_init (GimpOperationThreshold *self)
+{
+}
+
+static void
+gimp_operation_threshold_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpOperationThreshold *self = GIMP_OPERATION_THRESHOLD (object);
+
+ switch (property_id)
+ {
+ case PROP_CHANNEL:
+ g_value_set_enum (value, self->channel);
+ break;
+
+ case PROP_LOW:
+ g_value_set_double (value, self->low);
+ break;
+
+ case PROP_HIGH:
+ g_value_set_double (value, self->high);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_operation_threshold_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpOperationThreshold *self = GIMP_OPERATION_THRESHOLD (object);
+
+ switch (property_id)
+ {
+ case PROP_CHANNEL:
+ self->channel = g_value_get_enum (value);
+ break;
+
+ case PROP_LOW:
+ self->low = g_value_get_double (value);
+ break;
+
+ case PROP_HIGH:
+ self->high = g_value_get_double (value);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+ static gboolean
+gimp_operation_threshold_process (GeglOperation *operation,
+ void *in_buf,
+ void *out_buf,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level)
+{
+ GimpOperationThreshold *threshold = GIMP_OPERATION_THRESHOLD (operation);
+ gfloat *src = in_buf;
+ gfloat *dest = out_buf;
+
+ while (samples--)
+ {
+ gfloat value = 0.0;
+
+ switch (threshold->channel)
+ {
+ case GIMP_HISTOGRAM_VALUE:
+ value = MAX (src[RED], src[GREEN]);
+ value = MAX (value, src[BLUE]);
+ break;
+
+ case GIMP_HISTOGRAM_RED:
+ value = src[RED];
+ break;
+
+ case GIMP_HISTOGRAM_GREEN:
+ value = src[GREEN];
+ break;
+
+ case GIMP_HISTOGRAM_BLUE:
+ value = src[BLUE];
+ break;
+
+ case GIMP_HISTOGRAM_ALPHA:
+ value = src[ALPHA];
+ break;
+
+ case GIMP_HISTOGRAM_RGB:
+ value = MIN (src[RED], src[GREEN]);
+ value = MIN (value, src[BLUE]);
+ break;
+
+ case GIMP_HISTOGRAM_LUMINANCE:
+ value = GIMP_RGB_LUMINANCE (src[RED], src[GREEN], src[BLUE]);
+ break;
+ }
+
+ value = (value >= threshold->low && value <= threshold->high) ? 1.0 : 0.0;
+
+ dest[RED] = value;
+ dest[GREEN] = value;
+ dest[BLUE] = value;
+ dest[ALPHA] = src[ALPHA];
+
+ src += 4;
+ dest += 4;
+ }
+
+ return TRUE;
+}