448 lines
15 KiB
C
448 lines
15 KiB
C
/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* pikaoperationshrink.c
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* Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <cairo.h>
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#include <gegl.h>
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include "libpikacolor/pikacolor.h"
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#include "libpikamath/pikamath.h"
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#include "operations-types.h"
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#include "pikaoperationshrink.h"
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enum
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{
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PROP_0,
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PROP_RADIUS_X,
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PROP_RADIUS_Y,
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PROP_EDGE_LOCK
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};
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static void pika_operation_shrink_get_property (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec);
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static void pika_operation_shrink_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec);
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static void pika_operation_shrink_prepare (GeglOperation *operation);
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static GeglRectangle
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pika_operation_shrink_get_required_for_output (GeglOperation *self,
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const gchar *input_pad,
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const GeglRectangle *roi);
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static GeglRectangle
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pika_operation_shrink_get_cached_region (GeglOperation *self,
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const GeglRectangle *roi);
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static gboolean pika_operation_shrink_process (GeglOperation *operation,
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GeglBuffer *input,
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GeglBuffer *output,
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const GeglRectangle *roi,
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gint level);
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G_DEFINE_TYPE (PikaOperationShrink, pika_operation_shrink,
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GEGL_TYPE_OPERATION_FILTER)
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#define parent_class pika_operation_shrink_parent_class
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static void
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pika_operation_shrink_class_init (PikaOperationShrinkClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
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GeglOperationFilterClass *filter_class = GEGL_OPERATION_FILTER_CLASS (klass);
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object_class->set_property = pika_operation_shrink_set_property;
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object_class->get_property = pika_operation_shrink_get_property;
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gegl_operation_class_set_keys (operation_class,
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"name", "pika:shrink",
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"categories", "pika",
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"description", "PIKA Shrink operation",
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NULL);
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operation_class->prepare = pika_operation_shrink_prepare;
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operation_class->get_required_for_output = pika_operation_shrink_get_required_for_output;
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operation_class->get_cached_region = pika_operation_shrink_get_cached_region;
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operation_class->threaded = FALSE;
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filter_class->process = pika_operation_shrink_process;
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g_object_class_install_property (object_class, PROP_RADIUS_X,
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g_param_spec_int ("radius-x",
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"Radius X",
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"Shrink radius in X diection",
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1, 2342, 1,
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G_PARAM_READWRITE |
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G_PARAM_CONSTRUCT));
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g_object_class_install_property (object_class, PROP_RADIUS_Y,
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g_param_spec_int ("radius-y",
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"Radius Y",
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"Shrink radius in Y diection",
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1, 2342, 1,
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G_PARAM_READWRITE |
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G_PARAM_CONSTRUCT));
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g_object_class_install_property (object_class, PROP_EDGE_LOCK,
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g_param_spec_boolean ("edge-lock",
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"Edge Lock",
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"Shrink from border",
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FALSE,
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G_PARAM_READWRITE |
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G_PARAM_CONSTRUCT));
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}
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static void
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pika_operation_shrink_init (PikaOperationShrink *self)
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{
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}
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static void
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pika_operation_shrink_get_property (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec)
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{
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PikaOperationShrink *self = PIKA_OPERATION_SHRINK (object);
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switch (property_id)
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{
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case PROP_RADIUS_X:
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g_value_set_int (value, self->radius_x);
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break;
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case PROP_RADIUS_Y:
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g_value_set_int (value, self->radius_y);
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break;
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case PROP_EDGE_LOCK:
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g_value_set_boolean (value, self->edge_lock);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static void
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pika_operation_shrink_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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PikaOperationShrink *self = PIKA_OPERATION_SHRINK (object);
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switch (property_id)
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{
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case PROP_RADIUS_X:
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self->radius_x = g_value_get_int (value);
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break;
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case PROP_RADIUS_Y:
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self->radius_y = g_value_get_int (value);
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break;
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case PROP_EDGE_LOCK:
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self->edge_lock = g_value_get_boolean (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static void
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pika_operation_shrink_prepare (GeglOperation *operation)
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{
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const Babl *space = gegl_operation_get_source_space (operation, "input");
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gegl_operation_set_format (operation, "input", babl_format_with_space ("Y float", space));
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gegl_operation_set_format (operation, "output", babl_format_with_space ("Y float", space));
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}
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static GeglRectangle
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pika_operation_shrink_get_required_for_output (GeglOperation *self,
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const gchar *input_pad,
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const GeglRectangle *roi)
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{
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return *gegl_operation_source_get_bounding_box (self, "input");
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}
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static GeglRectangle
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pika_operation_shrink_get_cached_region (GeglOperation *self,
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const GeglRectangle *roi)
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{
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return *gegl_operation_source_get_bounding_box (self, "input");
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}
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static void
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compute_border (gint16 *circ,
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guint16 xradius,
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guint16 yradius)
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{
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gint32 i;
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gint32 diameter = xradius * 2 + 1;
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gdouble tmp;
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for (i = 0; i < diameter; i++)
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{
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if (i > xradius)
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tmp = (i - xradius) - 0.5;
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else if (i < xradius)
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tmp = (xradius - i) - 0.5;
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else
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tmp = 0.0;
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circ[i] = RINT (yradius /
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(gdouble) xradius * sqrt (SQR (xradius) - SQR (tmp)));
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}
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}
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static inline void
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rotate_pointers (gfloat **p,
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guint32 n)
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{
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guint32 i;
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gfloat *tmp;
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tmp = p[0];
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for (i = 0; i < n - 1; i++)
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p[i] = p[i + 1];
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p[i] = tmp;
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}
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static gboolean
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pika_operation_shrink_process (GeglOperation *operation,
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GeglBuffer *input,
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GeglBuffer *output,
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const GeglRectangle *roi,
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gint level)
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{
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/* Pretty much the same as fatten_region only different.
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* Blame all bugs in this function on jaycox@gimp.org
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*
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* If edge_lock is true we assume that pixels outside the region we
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* are passed are identical to the edge pixels. If edge_lock is
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* false, we assume that pixels outside the region are 0
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*/
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PikaOperationShrink *self = PIKA_OPERATION_SHRINK (operation);
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const Babl *input_format = babl_format ("Y float");
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const Babl *output_format = babl_format ("Y float");
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gint32 i, j, x, y;
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gfloat **buf; /* caches the the region's pixels */
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gfloat *out; /* holds the new scan line we are computing */
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gfloat **max; /* caches the smallest values for each column */
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gint16 *circ; /* holds the y coords of the filter's mask */
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gfloat last_max;
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gint16 last_index;
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gfloat *buffer;
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gint buffer_size;
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max = g_new (gfloat *, roi->width + 2 * self->radius_x);
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buf = g_new (gfloat *, self->radius_y + 1);
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for (i = 0; i < self->radius_y + 1; i++)
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buf[i] = g_new (gfloat, roi->width);
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buffer_size = (roi->width+ 2 * self->radius_x + 1) * (self->radius_y + 1);
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buffer = g_new (gfloat, buffer_size);
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if (self->edge_lock)
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{
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for (i = 0; i < buffer_size; i++)
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buffer[i] = 1.0;
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}
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else
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{
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memset (buffer, 0, buffer_size * sizeof (gfloat));
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}
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for (i = 0; i < roi->width + 2 * self->radius_x; i++)
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{
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if (i < self->radius_x)
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{
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if (self->edge_lock)
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max[i] = buffer;
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else
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max[i] = &buffer[(self->radius_y + 1) * (roi->width + self->radius_x)];
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}
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else if (i < roi->width + self->radius_x)
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{
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max[i] = &buffer[(self->radius_y + 1) * (i - self->radius_x)];
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}
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else
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{
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if (self->edge_lock)
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max[i] = &buffer[(self->radius_y + 1) * (roi->width + self->radius_x - 1)];
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else
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max[i] = &buffer[(self->radius_y + 1) * (roi->width + self->radius_x)];
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}
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}
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if (! self->edge_lock)
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for (j = 0 ; j < self->radius_y + 1; j++)
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max[0][j] = 0.0;
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/* offset the max pointer by self->radius_x so the range of the
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* array is [-self->radius_x] to [roi->width + self->radius_x]
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*/
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max += self->radius_x;
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out = g_new (gfloat, roi->width);
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circ = g_new (gint16, 2 * self->radius_x + 1);
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compute_border (circ, self->radius_x, self->radius_y);
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/* offset the circ pointer by self->radius_x so the range of the
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* array is [-self->radius_x] to [self->radius_x]
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*/
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circ += self->radius_x;
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for (i = 0; i < self->radius_y && i < roi->height; i++) /* load top of image */
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gegl_buffer_get (input,
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GEGL_RECTANGLE (roi->x, roi->y + i,
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roi->width, 1),
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1.0, input_format, buf[i + 1],
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GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
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if (self->edge_lock)
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memcpy (buf[0], buf[1], roi->width * sizeof (gfloat));
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else
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memset (buf[0], 0, roi->width * sizeof (gfloat));
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for (x = 0; x < roi->width; x++) /* set up max for top of image */
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{
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max[x][0] = buf[0][x];
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for (j = 1; j < self->radius_y + 1; j++)
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max[x][j] = MIN (buf[j][x], max[x][j - 1]);
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}
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for (y = 0; y < roi->height; y++)
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{
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rotate_pointers (buf, self->radius_y + 1);
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if (y < roi->height - self->radius_y)
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gegl_buffer_get (input,
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GEGL_RECTANGLE (roi->x, roi->y + y + self->radius_y,
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roi->width, 1),
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1.0, input_format, buf[self->radius_y],
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GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
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else if (self->edge_lock)
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memcpy (buf[self->radius_y], buf[self->radius_y - 1],
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roi->width * sizeof (gfloat));
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else
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memset (buf[self->radius_y], 0, roi->width * sizeof (gfloat));
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for (x = 0 ; x < roi->width; x++) /* update max array */
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{
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for (i = self->radius_y; i > 0; i--)
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max[x][i] = MIN (MIN (max[x][i - 1], buf[i - 1][x]), buf[i][x]);
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max[x][0] = buf[0][x];
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}
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last_max = max[0][circ[-1]];
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last_index = 0;
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for (x = 0 ; x < roi->width; x++) /* render scan line */
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{
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last_index--;
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if (last_index >= 0)
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{
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if (last_max <= 0.0)
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{
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out[x] = 0.0;
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}
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else
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{
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last_max = 1.0;
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for (i = self->radius_x; i >= 0; i--)
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if (last_max > max[x + i][circ[i]])
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{
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last_max = max[x + i][circ[i]];
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last_index = i;
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}
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out[x] = last_max;
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}
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}
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else
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{
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last_index = self->radius_x;
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last_max = max[x + self->radius_x][circ[self->radius_x]];
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for (i = self->radius_x - 1; i >= -self->radius_x; i--)
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if (last_max > max[x + i][circ[i]])
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{
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last_max = max[x + i][circ[i]];
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last_index = i;
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}
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out[x] = last_max;
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}
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}
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gegl_buffer_set (output,
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GEGL_RECTANGLE (roi->x, roi->y + y,
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roi->width, 1),
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0, output_format, out,
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GEGL_AUTO_ROWSTRIDE);
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}
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/* undo the offsets to the pointers so we can free the malloced memory */
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circ -= self->radius_x;
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max -= self->radius_x;
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/* free the memory */
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g_free (circ);
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g_free (buffer);
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g_free (max);
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for (i = 0; i < self->radius_y + 1; i++)
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g_free (buf[i]);
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g_free (buf);
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g_free (out);
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return TRUE;
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}
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