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Diffstat (limited to 'app/operations/layer-modes/gimpoperationdissolve.c')
| -rw-r--r-- | app/operations/layer-modes/gimpoperationdissolve.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/app/operations/layer-modes/gimpoperationdissolve.c b/app/operations/layer-modes/gimpoperationdissolve.c new file mode 100644 index 0000000..fb4b1d0 --- /dev/null +++ b/app/operations/layer-modes/gimpoperationdissolve.c @@ -0,0 +1,175 @@ +/* GIMP - The GNU Image Manipulation Program + * Copyright (C) 1995 Spencer Kimball and Peter Mattis + * + * gimpoperationdissolve.c + * Copyright (C) 2012 Ville Sokk <ville.sokk@gmail.com> + * 2012 Øyvind Kolås <pippin@gimp.org> + * 2003 Helvetix Victorinox + * + * 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 <gegl-plugin.h> + +#include "../operations-types.h" + +#include "gimpoperationdissolve.h" + + +#define RANDOM_TABLE_SIZE 4096 + + +static gboolean gimp_operation_dissolve_process (GeglOperation *op, + void *in, + void *layer, + void *mask, + void *out, + glong samples, + const GeglRectangle *result, + gint level); +static GimpLayerCompositeRegion gimp_operation_dissolve_get_affected_region (GimpOperationLayerMode *layer_mode); + + +G_DEFINE_TYPE (GimpOperationDissolve, gimp_operation_dissolve, + GIMP_TYPE_OPERATION_LAYER_MODE) + + +static gint32 random_table[RANDOM_TABLE_SIZE]; + + +static void +gimp_operation_dissolve_class_init (GimpOperationDissolveClass *klass) +{ + GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass); + GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass); + GRand *gr; + gint i; + + gegl_operation_class_set_keys (operation_class, + "name", "gimp:dissolve", + "description", "GIMP dissolve mode operation", + "categories", "compositors", + NULL); + + layer_mode_class->process = gimp_operation_dissolve_process; + layer_mode_class->get_affected_region = gimp_operation_dissolve_get_affected_region; + + /* generate a table of random seeds */ + gr = g_rand_new_with_seed (314159265); + for (i = 0; i < RANDOM_TABLE_SIZE; i++) + random_table[i] = g_rand_int (gr); + + g_rand_free (gr); +} + +static void +gimp_operation_dissolve_init (GimpOperationDissolve *self) +{ +} + +static gboolean +gimp_operation_dissolve_process (GeglOperation *op, + void *in_p, + void *layer_p, + void *mask_p, + void *out_p, + glong samples, + const GeglRectangle *result, + gint level) +{ + GimpOperationLayerMode *layer_mode = (gpointer) op; + gfloat *in = in_p; + gfloat *out = out_p; + gfloat *layer = layer_p; + gfloat *mask = mask_p; + gfloat opacity = layer_mode->opacity; + const gboolean has_mask = mask != NULL; + gint x, y; + + for (y = result->y; y < result->y + result->height; y++) + { + GRand *gr; + + /* The offset can be negative. I could just abs() the result, but we + * probably prefer to use different indexes of the table when possible for + * nicer randomization, so let's cycle the modulo so that -1 is the last + * table index. + */ + gr = g_rand_new_with_seed (random_table[((y % RANDOM_TABLE_SIZE) + RANDOM_TABLE_SIZE) % RANDOM_TABLE_SIZE]); + + /* fast forward through the rows pseudo random sequence */ + for (x = 0; x < result->x; x++) + g_rand_int (gr); + + for (x = result->x; x < result->x + result->width; x++) + { + gfloat value = layer[ALPHA] * opacity * 255; + + if (has_mask) + value *= *mask; + + if (g_rand_int_range (gr, 0, 255) >= value) + { + out[0] = in[0]; + out[1] = in[1]; + out[2] = in[2]; + + if (layer_mode->composite_mode == GIMP_LAYER_COMPOSITE_UNION || + layer_mode->composite_mode == GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP) + { + out[3] = in[3]; + } + else + { + out[3] = 0.0f; + } + } + else + { + out[0] = layer[0]; + out[1] = layer[1]; + out[2] = layer[2]; + + if (layer_mode->composite_mode == GIMP_LAYER_COMPOSITE_UNION || + layer_mode->composite_mode == GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER) + { + out[3] = 1.0f; + } + else + { + out[3] = in[3]; + } + } + + in += 4; + layer += 4; + out += 4; + + if (has_mask) + mask++; + } + + g_rand_free (gr); + } + + return TRUE; +} + +static GimpLayerCompositeRegion +gimp_operation_dissolve_get_affected_region (GimpOperationLayerMode *layer_mode) +{ + return GIMP_LAYER_COMPOSITE_REGION_SOURCE; +} |