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Diffstat (limited to 'app/operations/gimpoperationthresholdalpha.c')
| -rw-r--r-- | app/operations/gimpoperationthresholdalpha.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/app/operations/gimpoperationthresholdalpha.c b/app/operations/gimpoperationthresholdalpha.c new file mode 100644 index 0000000..94cbaf5 --- /dev/null +++ b/app/operations/gimpoperationthresholdalpha.c @@ -0,0 +1,178 @@ +/* GIMP - The GNU Image Manipulation Program + * Copyright (C) 1995 Spencer Kimball and Peter Mattis + * + * gimpoperationthresholdalpha.c + * Copyright (C) 2012 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/>. + * + * Ported from the threshold-alpha plug-in + * Copyright (C) 1997 Shuji Narazaki <narazaki@InetQ.or.jp> + */ + +#include "config.h" + +#include <gegl.h> + +#include "operations-types.h" + +#include "gimpoperationthresholdalpha.h" + +#include "gimp-intl.h" + + +enum +{ + PROP_0, + PROP_VALUE +}; + + +static void gimp_operation_threshold_alpha_get_property (GObject *object, + guint property_id, + GValue *value, + GParamSpec *pspec); +static void gimp_operation_threshold_alpha_set_property (GObject *object, + guint property_id, + const GValue *value, + GParamSpec *pspec); + +static void gimp_operation_threshold_alpha_prepare (GeglOperation *operation); +static gboolean gimp_operation_threshold_alpha_process (GeglOperation *operation, + void *in_buf, + void *out_buf, + glong samples, + const GeglRectangle *roi, + gint level); + + +G_DEFINE_TYPE (GimpOperationThresholdAlpha, gimp_operation_threshold_alpha, + GEGL_TYPE_OPERATION_POINT_FILTER) + +#define parent_class gimp_operation_threshold_alpha_parent_class + + +static void +gimp_operation_threshold_alpha_class_init (GimpOperationThresholdAlphaClass *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_alpha_set_property; + object_class->get_property = gimp_operation_threshold_alpha_get_property; + + gegl_operation_class_set_keys (operation_class, + "name", "gimp:threshold-alpha", + "categories", "color", + "description", + _("Make transparency all-or-nothing, by " + "thresholding the alpha channel to a value"), + NULL); + + operation_class->prepare = gimp_operation_threshold_alpha_prepare; + + point_class->process = gimp_operation_threshold_alpha_process; + + g_object_class_install_property (object_class, PROP_VALUE, + g_param_spec_double ("value", + _("Value"), + _("The alpha value"), + 0.0, 1.0, 0.5, + G_PARAM_READWRITE | + G_PARAM_CONSTRUCT)); +} + +static void +gimp_operation_threshold_alpha_init (GimpOperationThresholdAlpha *self) +{ +} + +static void +gimp_operation_threshold_alpha_get_property (GObject *object, + guint property_id, + GValue *value, + GParamSpec *pspec) +{ + GimpOperationThresholdAlpha *self = GIMP_OPERATION_THRESHOLD_ALPHA (object); + + switch (property_id) + { + case PROP_VALUE: + g_value_set_double (value, self->value); + break; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + break; + } +} + +static void +gimp_operation_threshold_alpha_set_property (GObject *object, + guint property_id, + const GValue *value, + GParamSpec *pspec) +{ + GimpOperationThresholdAlpha *self = GIMP_OPERATION_THRESHOLD_ALPHA (object); + + switch (property_id) + { + case PROP_VALUE: + self->value = g_value_get_double (value); + break; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + break; + } +} + +static void +gimp_operation_threshold_alpha_prepare (GeglOperation *operation) +{ + const Babl *space = gegl_operation_get_source_space (operation, "input"); + gegl_operation_set_format (operation, "input", babl_format_with_space ("RGBA float", space)); + gegl_operation_set_format (operation, "output", babl_format_with_space ("RGBA float", space)); +} + +static gboolean +gimp_operation_threshold_alpha_process (GeglOperation *operation, + void *in_buf, + void *out_buf, + glong samples, + const GeglRectangle *roi, + gint level) +{ + GimpOperationThresholdAlpha *self = GIMP_OPERATION_THRESHOLD_ALPHA (operation); + gfloat *src = in_buf; + gfloat *dest = out_buf; + + while (samples--) + { + dest[RED] = src[RED]; + dest[GREEN] = src[GREEN]; + dest[BLUE] = src[BLUE]; + + if (src[ALPHA] > self->value) + dest[ALPHA] = 1.0; + else + dest[ALPHA] = 0.0; + + src += 4; + dest += 4; + } + + return TRUE; +} |