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Diffstat (limited to 'app/operations/gimpoperationthreshold.c')
| -rw-r--r-- | app/operations/gimpoperationthreshold.c | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/app/operations/gimpoperationthreshold.c b/app/operations/gimpoperationthreshold.c new file mode 100644 index 0000000..e33a9ec --- /dev/null +++ b/app/operations/gimpoperationthreshold.c @@ -0,0 +1,232 @@ +/* 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; +} |