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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 16:23:22 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 16:23:22 +0000 |
commit | e42129241681dde7adae7d20697e7b421682fbb4 (patch) | |
tree | af1fe815a5e639e68e59fabd8395ec69458b3e5e /app/operations/layer-modes-legacy/gimpoperationsubtractlegacy.c | |
parent | Initial commit. (diff) | |
download | gimp-e42129241681dde7adae7d20697e7b421682fbb4.tar.xz gimp-e42129241681dde7adae7d20697e7b421682fbb4.zip |
Adding upstream version 2.10.22.upstream/2.10.22upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | app/operations/layer-modes-legacy/gimpoperationsubtractlegacy.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/app/operations/layer-modes-legacy/gimpoperationsubtractlegacy.c b/app/operations/layer-modes-legacy/gimpoperationsubtractlegacy.c new file mode 100644 index 0000000..0bf3b5e --- /dev/null +++ b/app/operations/layer-modes-legacy/gimpoperationsubtractlegacy.c @@ -0,0 +1,125 @@ +/* GIMP - The GNU Image Manipulation Program + * Copyright (C) 1995 Spencer Kimball and Peter Mattis + * + * gimpoperationsubtractmode.c + * Copyright (C) 2008 Michael Natterer <mitch@gimp.org> + * 2012 Ville Sokk <ville.sokk@gmail.com> + * + * 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 "gimpoperationsubtractlegacy.h" + + +static gboolean gimp_operation_subtract_legacy_process (GeglOperation *op, + void *in, + void *layer, + void *mask, + void *out, + glong samples, + const GeglRectangle *roi, + gint level); + + +G_DEFINE_TYPE (GimpOperationSubtractLegacy, gimp_operation_subtract_legacy, + GIMP_TYPE_OPERATION_LAYER_MODE) + + +static void +gimp_operation_subtract_legacy_class_init (GimpOperationSubtractLegacyClass *klass) +{ + GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass); + GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass); + + gegl_operation_class_set_keys (operation_class, + "name", "gimp:subtract-legacy", + "description", "GIMP subtract mode operation", + NULL); + + layer_mode_class->process = gimp_operation_subtract_legacy_process; +} + +static void +gimp_operation_subtract_legacy_init (GimpOperationSubtractLegacy *self) +{ +} + +static gboolean +gimp_operation_subtract_legacy_process (GeglOperation *op, + void *in_p, + void *layer_p, + void *mask_p, + void *out_p, + glong samples, + const GeglRectangle *roi, + 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; + + while (samples--) + { + gfloat comp_alpha, new_alpha; + + comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity; + if (mask) + comp_alpha *= *mask; + + new_alpha = in[ALPHA] + (1.0f - in[ALPHA]) * comp_alpha; + + if (comp_alpha && new_alpha) + { + gint b; + gfloat ratio = comp_alpha / new_alpha; + + for (b = RED; b < ALPHA; b++) + { + gfloat comp = in[b] - layer[b]; + comp = CLAMP (comp, 0.0f, 1.0f); + + out[b] = comp * ratio + in[b] * (1.0f - ratio); + } + } + else + { + gint b; + + for (b = RED; b < ALPHA; b++) + { + out[b] = in[b]; + } + } + + out[ALPHA] = in[ALPHA]; + + in += 4; + layer += 4; + out += 4; + + if (mask) + mask++; + } + + return TRUE; +} |