180 lines
6.4 KiB
C
180 lines
6.4 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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* pikaoperationdissolve.c
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* Copyright (C) 2012 Ville Sokk <ville.sokk@gmail.com>
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* 2012 Øyvind Kolås <pippin@gimp.org>
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* 2003 Helvetix Victorinox
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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 <gegl-plugin.h>
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#include "../operations-types.h"
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#include "pikaoperationdissolve.h"
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#define RANDOM_TABLE_SIZE 4096
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static gboolean pika_operation_dissolve_process (GeglOperation *op,
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void *in,
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void *layer,
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void *mask,
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void *out,
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glong samples,
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const GeglRectangle *result,
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gint level);
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static PikaLayerCompositeRegion pika_operation_dissolve_get_affected_region (PikaOperationLayerMode *layer_mode);
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G_DEFINE_TYPE (PikaOperationDissolve, pika_operation_dissolve,
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PIKA_TYPE_OPERATION_LAYER_MODE)
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static gint32 random_table[RANDOM_TABLE_SIZE];
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static void
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pika_operation_dissolve_class_init (PikaOperationDissolveClass *klass)
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{
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GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
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PikaOperationLayerModeClass *layer_mode_class = PIKA_OPERATION_LAYER_MODE_CLASS (klass);
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GRand *gr;
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gint i;
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gegl_operation_class_set_keys (operation_class,
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"name", "pika:dissolve",
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"description", "PIKA dissolve mode operation",
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"categories", "compositors",
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NULL);
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layer_mode_class->process = pika_operation_dissolve_process;
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layer_mode_class->get_affected_region = pika_operation_dissolve_get_affected_region;
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/* generate a table of random seeds */
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gr = g_rand_new_with_seed (314159265);
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for (i = 0; i < RANDOM_TABLE_SIZE; i++)
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random_table[i] = g_rand_int (gr);
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g_rand_free (gr);
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}
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static void
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pika_operation_dissolve_init (PikaOperationDissolve *self)
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{
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}
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static gboolean
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pika_operation_dissolve_process (GeglOperation *op,
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void *in_p,
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void *layer_p,
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void *mask_p,
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void *out_p,
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glong samples,
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const GeglRectangle *result,
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gint level)
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{
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PikaOperationLayerMode *layer_mode = (gpointer) op;
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gfloat *in = in_p;
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gfloat *out = out_p;
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gfloat *layer = layer_p;
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gfloat *mask = mask_p;
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gfloat opacity = layer_mode->opacity;
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const gboolean has_mask = mask != NULL;
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gint x, y;
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for (y = result->y; y < result->y + result->height; y++)
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{
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GRand *gr;
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/* The offset can be negative. I could just abs() the result, but we
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* probably prefer to use different indexes of the table when possible for
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* nicer randomization, so let's cycle the modulo so that -1 is the last
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* table index.
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*/
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gr = g_rand_new_with_seed (random_table[((y % RANDOM_TABLE_SIZE) + RANDOM_TABLE_SIZE) % RANDOM_TABLE_SIZE]);
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/* fast forward through the rows pseudo random sequence */
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for (x = 0; x < result->x; x++)
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g_rand_int (gr);
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for (x = result->x; x < result->x + result->width; x++)
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{
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gfloat value = layer[ALPHA] * opacity * 255;
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if (has_mask)
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value *= *mask;
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if (g_rand_int_range (gr, 0, 255) >= value)
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{
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out[0] = in[0];
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out[1] = in[1];
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out[2] = in[2];
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if (layer_mode->composite_mode == PIKA_LAYER_COMPOSITE_UNION ||
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layer_mode->composite_mode == PIKA_LAYER_COMPOSITE_CLIP_TO_BACKDROP)
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{
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out[3] = in[3];
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}
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else
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{
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out[3] = 0.0f;
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}
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}
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else
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{
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out[0] = layer[0];
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out[1] = layer[1];
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out[2] = layer[2];
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if (layer_mode->composite_mode == PIKA_LAYER_COMPOSITE_UNION ||
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layer_mode->composite_mode == PIKA_LAYER_COMPOSITE_CLIP_TO_LAYER)
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{
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out[3] = 1.0f;
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}
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else
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{
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out[3] = in[3];
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}
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}
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in += 4;
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layer += 4;
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out += 4;
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if (has_mask)
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mask++;
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}
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g_rand_free (gr);
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}
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return TRUE;
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}
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static PikaLayerCompositeRegion
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pika_operation_dissolve_get_affected_region (PikaOperationLayerMode *layer_mode)
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{
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return PIKA_LAYER_COMPOSITE_REGION_SOURCE;
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}
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