[gimp] app: add new files for subtract/addition ops
- From: Øyvind Kolås <ok src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gimp] app: add new files for subtract/addition ops
- Date: Tue, 10 Jan 2017 00:42:49 +0000 (UTC)
commit dfcb5c11dedae5749d53dd1a790e97ad3a6b5506
Author: Øyvind Kolås <pippin gimp org>
Date: Tue Jan 10 01:42:34 2017 +0100
app: add new files for subtract/addition ops
.../gimpoperationadditionlegacy.c | 138 ++++++++++++++++++++
.../gimpoperationadditionlegacy.h | 61 +++++++++
.../gimpoperationsubtractlegacy.c | 137 +++++++++++++++++++
.../gimpoperationsubtractlegacy.h | 61 +++++++++
app/operations/layer-modes/gimpoperationaddition.c | 136 +++++++++++++++++++
app/operations/layer-modes/gimpoperationaddition.h | 62 +++++++++
app/operations/layer-modes/gimpoperationsubtract.c | 135 +++++++++++++++++++
app/operations/layer-modes/gimpoperationsubtract.h | 62 +++++++++
8 files changed, 792 insertions(+), 0 deletions(-)
---
diff --git a/app/operations/layer-modes-legacy/gimpoperationadditionlegacy.c
b/app/operations/layer-modes-legacy/gimpoperationadditionlegacy.c
new file mode 100644
index 0000000..3a5c33f
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationadditionlegacy.c
@@ -0,0 +1,138 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationadditionmode.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 <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationadditionlegacy.h"
+
+
+static gboolean gimp_operation_addition_legacy_process (GeglOperation *operation,
+ void *in_buf,
+ void *aux_buf,
+ void *aux2_buf,
+ void *out_buf,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level);
+
+
+G_DEFINE_TYPE (GimpOperationAdditionLegacy, gimp_operation_addition_legacy,
+ GIMP_TYPE_OPERATION_POINT_LAYER_MODE)
+
+
+static void
+gimp_operation_addition_legacy_class_init (GimpOperationAdditionLegacyClass *klass)
+{
+ GeglOperationClass *operation_class;
+ GeglOperationPointComposer3Class *point_class;
+
+ operation_class = GEGL_OPERATION_CLASS (klass);
+ point_class = GEGL_OPERATION_POINT_COMPOSER3_CLASS (klass);
+
+ gegl_operation_class_set_keys (operation_class,
+ "name", "gimp:addition-mode",
+ "description", "GIMP addition mode operation",
+ NULL);
+
+ point_class->process = gimp_operation_addition_legacy_process;
+}
+
+static void
+gimp_operation_addition_legacy_init (GimpOperationAdditionLegacy *self)
+{
+}
+
+static gboolean
+gimp_operation_addition_legacy_process (GeglOperation *operation,
+ void *in_buf,
+ void *aux_buf,
+ void *aux2_buf,
+ void *out_buf,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level)
+{
+ gfloat opacity = GIMP_OPERATION_POINT_LAYER_MODE (operation)->opacity;
+
+ return gimp_operation_addition_legacy_process_pixels (in_buf, aux_buf, aux2_buf, out_buf, opacity,
samples, roi, level);
+}
+
+gboolean
+gimp_operation_addition_legacy_process_pixels (gfloat *in,
+ gfloat *layer,
+ gfloat *mask,
+ gfloat *out,
+ gfloat opacity,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level)
+{
+ const gboolean has_mask = mask != NULL;
+
+ while (samples--)
+ {
+ gfloat comp_alpha, new_alpha;
+
+ comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
+ if (has_mask)
+ comp_alpha *= *mask;
+
+ new_alpha = in[ALPHA] + (1.0 - in[ALPHA]) * comp_alpha;
+
+ if (comp_alpha && new_alpha)
+ {
+ gfloat ratio = comp_alpha / new_alpha;
+ gint b;
+
+ for (b = RED; b < ALPHA; b++)
+ {
+ gfloat comp = in[b] + layer[b];
+
+ out[b] = comp * ratio + in[b] * (1.0 - ratio);
+ out[b] = CLAMP (out[b], 0.0, 1.0);
+ }
+ }
+ else
+ {
+ gint b;
+
+ for (b = RED; b < ALPHA; b++)
+ {
+ out[b] = in[b];
+ }
+ }
+
+ out[ALPHA] = in[ALPHA];
+
+ in += 4;
+ layer += 4;
+ out += 4;
+
+ if (has_mask)
+ mask++;
+ }
+
+ return TRUE;
+}
diff --git a/app/operations/layer-modes-legacy/gimpoperationadditionlegacy.h
b/app/operations/layer-modes-legacy/gimpoperationadditionlegacy.h
new file mode 100644
index 0000000..adda7e7
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationadditionlegacy.h
@@ -0,0 +1,61 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationadditionmode.h
+ * Copyright (C) 2008 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 <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_ADDITION_LEGACY_H__
+#define __GIMP_OPERATION_ADDITION_LEGACY_H__
+
+
+#include "../gimpoperationpointlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_ADDITION_LEGACY (gimp_operation_addition_legacy_get_type ())
+#define GIMP_OPERATION_ADDITION_LEGACY(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj),
GIMP_TYPE_OPERATION_ADDITION_LEGACY, GimpOperationAdditionLegacy))
+#define GIMP_OPERATION_ADDITION_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass),
GIMP_TYPE_OPERATION_ADDITION_LEGACY, GimpOperationAdditionLegacyClass))
+#define GIMP_IS_OPERATION_ADDITION_LEGACY(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj),
GIMP_TYPE_OPERATION_ADDITION_LEGACY))
+#define GIMP_IS_OPERATION_ADDITION_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),
GIMP_TYPE_OPERATION_ADDITION_LEGACY))
+#define GIMP_OPERATION_ADDITION_LEGACY_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj),
GIMP_TYPE_OPERATION_ADDITION_LEGACY, GimpOperationAdditionLegacyClass))
+
+
+typedef struct _GimpOperationAdditionLegacy GimpOperationAdditionLegacy;
+typedef struct _GimpOperationAdditionLegacyClass GimpOperationAdditionLegacyClass;
+
+struct _GimpOperationAdditionLegacy
+{
+ GimpOperationPointLayerMode parent_instance;
+};
+
+struct _GimpOperationAdditionLegacyClass
+{
+ GimpOperationPointLayerModeClass parent_class;
+};
+
+
+GType gimp_operation_addition_legacy_get_type (void) G_GNUC_CONST;
+
+gboolean gimp_operation_addition_legacy_process_pixels (gfloat *in,
+ gfloat *layer,
+ gfloat *mask,
+ gfloat *out,
+ gfloat opacity,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level);
+
+#endif /* __GIMP_OPERATION_ADDITION_LEGACY_H__ */
diff --git a/app/operations/layer-modes-legacy/gimpoperationsubtractlegacy.c
b/app/operations/layer-modes-legacy/gimpoperationsubtractlegacy.c
new file mode 100644
index 0000000..ef88fb7
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationsubtractlegacy.c
@@ -0,0 +1,137 @@
+/* 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 <http://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 *operation,
+ void *in_buf,
+ void *aux_buf,
+ void *aux2_buf,
+ void *out_buf,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level);
+
+
+G_DEFINE_TYPE (GimpOperationSubtractLegacy, gimp_operation_subtract_legacy,
+ GIMP_TYPE_OPERATION_POINT_LAYER_MODE)
+
+
+static void
+gimp_operation_subtract_legacy_class_init (GimpOperationSubtractLegacyClass *klass)
+{
+ GeglOperationClass *operation_class;
+ GeglOperationPointComposer3Class *point_class;
+
+ operation_class = GEGL_OPERATION_CLASS (klass);
+ point_class = GEGL_OPERATION_POINT_COMPOSER3_CLASS (klass);
+
+ gegl_operation_class_set_keys (operation_class,
+ "name", "gimp:subtract-mode",
+ "description", "GIMP subtract mode operation",
+ NULL);
+
+ point_class->process = gimp_operation_subtract_legacy_process;
+}
+
+static void
+gimp_operation_subtract_legacy_init (GimpOperationSubtractLegacy *self)
+{
+}
+
+static gboolean
+gimp_operation_subtract_legacy_process (GeglOperation *operation,
+ void *in_buf,
+ void *aux_buf,
+ void *aux2_buf,
+ void *out_buf,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level)
+{
+ gfloat opacity = GIMP_OPERATION_POINT_LAYER_MODE (operation)->opacity;
+
+ return gimp_operation_subtract_legacy_process_pixels (in_buf, aux_buf, aux2_buf, out_buf, opacity,
samples, roi, level);
+}
+
+gboolean
+gimp_operation_subtract_legacy_process_pixels (gfloat *in,
+ gfloat *layer,
+ gfloat *mask,
+ gfloat *out,
+ gfloat opacity,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level)
+{
+ const gboolean has_mask = mask != NULL;
+
+ while (samples--)
+ {
+ gfloat comp_alpha, new_alpha;
+
+ comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
+ if (has_mask)
+ comp_alpha *= *mask;
+
+ new_alpha = in[ALPHA] + (1.0 - 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];
+ out[b] = comp * ratio + in[b] * (1.0 - ratio);
+ out[b] = CLAMP(out[b], 0.0, 1.0);
+ }
+ }
+ else
+ {
+ gint b;
+
+ for (b = RED; b < ALPHA; b++)
+ {
+ out[b] = in[b];
+ }
+ }
+
+ out[ALPHA] = in[ALPHA];
+
+ in += 4;
+ layer += 4;
+ out += 4;
+
+ if (has_mask)
+ mask++;
+ }
+
+ return TRUE;
+}
diff --git a/app/operations/layer-modes-legacy/gimpoperationsubtractlegacy.h
b/app/operations/layer-modes-legacy/gimpoperationsubtractlegacy.h
new file mode 100644
index 0000000..afe0b03
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationsubtractlegacy.h
@@ -0,0 +1,61 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationsubtractmode.h
+ * Copyright (C) 2008 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 <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_SUBTRACT_LEGACY_H__
+#define __GIMP_OPERATION_SUBTRACT_LEGACY_H__
+
+
+#include "../gimpoperationpointlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_SUBTRACT_LEGACY (gimp_operation_subtract_legacy_get_type ())
+#define GIMP_OPERATION_SUBTRACT_LEGACY(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj),
GIMP_TYPE_OPERATION_SUBTRACT_LEGACY, GimpOperationSubtractLegacy))
+#define GIMP_OPERATION_SUBTRACT_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass),
GIMP_TYPE_OPERATION_SUBTRACT_LEGACY, GimpOperationSubtractLegacyClass))
+#define GIMP_IS_OPERATION_SUBTRACT_LEGACY(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj),
GIMP_TYPE_OPERATION_SUBTRACT_LEGACY))
+#define GIMP_IS_OPERATION_SUBTRACT_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),
GIMP_TYPE_OPERATION_SUBTRACT_LEGACY))
+#define GIMP_OPERATION_SUBTRACT_LEGACY_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj),
GIMP_TYPE_OPERATION_SUBTRACT_LEGACY, GimpOperationSubtractLegacyClass))
+
+
+typedef struct _GimpOperationSubtractLegacy GimpOperationSubtractLegacy;
+typedef struct _GimpOperationSubtractLegacyClass GimpOperationSubtractLegacyClass;
+
+struct _GimpOperationSubtractLegacy
+{
+ GimpOperationPointLayerMode parent_instance;
+};
+
+struct _GimpOperationSubtractLegacyClass
+{
+ GimpOperationPointLayerModeClass parent_class;
+};
+
+
+GType gimp_operation_subtract_legacy_get_type (void) G_GNUC_CONST;
+
+gboolean gimp_operation_subtract_legacy_process_pixels (gfloat *in,
+ gfloat *layer,
+ gfloat *mask,
+ gfloat *out,
+ gfloat opacity,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level);
+
+#endif /* __GIMP_OPERATION_SUBTRACT_LEGACY_H__ */
diff --git a/app/operations/layer-modes/gimpoperationaddition.c
b/app/operations/layer-modes/gimpoperationaddition.c
new file mode 100644
index 0000000..f2b2200
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationaddition.c
@@ -0,0 +1,136 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationadditionmode.c
+ * Copyright (C) 2008 Michael Natterer <mitch gimp org>
+ * 2012 Ville Sokk <ville sokk gmail com>
+ * 2017 Øyvind Kolås <pippin 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationaddition.h"
+
+
+static gboolean gimp_operation_addition_process (GeglOperation *operation,
+ void *in_buf,
+ void *aux_buf,
+ void *aux2_buf,
+ void *out_buf,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level);
+
+
+G_DEFINE_TYPE (GimpOperationAddition, gimp_operation_addition,
+ GIMP_TYPE_OPERATION_POINT_LAYER_MODE)
+
+
+static void
+gimp_operation_addition_class_init (GimpOperationAdditionClass *klass)
+{
+ GeglOperationClass *operation_class;
+ GeglOperationPointComposer3Class *point_class;
+
+ operation_class = GEGL_OPERATION_CLASS (klass);
+ point_class = GEGL_OPERATION_POINT_COMPOSER3_CLASS (klass);
+
+ gegl_operation_class_set_keys (operation_class,
+ "name", "gimp:addition-mode",
+ "description", "GIMP addition mode operation",
+ NULL);
+
+ point_class->process = gimp_operation_addition_process;
+}
+
+static void
+gimp_operation_addition_init (GimpOperationAddition *self)
+{
+}
+
+static gboolean
+gimp_operation_addition_process (GeglOperation *operation,
+ void *in_buf,
+ void *aux_buf,
+ void *aux2_buf,
+ void *out_buf,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level)
+{
+ gfloat opacity = GIMP_OPERATION_POINT_LAYER_MODE (operation)->opacity;
+
+ return gimp_operation_addition_process_pixels (in_buf, aux_buf, aux2_buf, out_buf, opacity, samples, roi,
level);
+}
+
+gboolean
+gimp_operation_addition_process_pixels (gfloat *in,
+ gfloat *layer,
+ gfloat *mask,
+ gfloat *out,
+ gfloat opacity,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level)
+{
+ const gboolean has_mask = mask != NULL;
+
+ while (samples--)
+ {
+ gfloat comp_alpha;
+
+ comp_alpha = layer[ALPHA] * opacity;
+ if (has_mask)
+ comp_alpha *= *mask;
+
+ if (comp_alpha != 0.0)
+ {
+ gint b;
+
+ for (b = RED; b < ALPHA; b++)
+ {
+ gfloat comp = in[b] + layer[b];
+
+ out[b] = comp * comp_alpha + in[b] * (1.0 - comp_alpha);
+ out[b] = CLAMP (out[b], 0.0, 1.0);
+ }
+ }
+ else
+ {
+ gint b;
+
+ for (b = RED; b < ALPHA; b++)
+ {
+ out[b] = in[b];
+ }
+ }
+
+ out[ALPHA] = in[ALPHA];
+
+ in += 4;
+ layer += 4;
+ out += 4;
+
+ if (has_mask)
+ mask++;
+ }
+
+ return TRUE;
+}
diff --git a/app/operations/layer-modes/gimpoperationaddition.h
b/app/operations/layer-modes/gimpoperationaddition.h
new file mode 100644
index 0000000..e3a14a6
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationaddition.h
@@ -0,0 +1,62 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationadditionmode.h
+ * Copyright (C) 2008 Michael Natterer <mitch gimp org>
+ * 2017 Øyvind Kolås <pippin 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 <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_ADDITION_H__
+#define __GIMP_OPERATION_ADDITION_H__
+
+
+#include "../gimpoperationpointlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_ADDITION (gimp_operation_addition_get_type ())
+#define GIMP_OPERATION_ADDITION(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj),
GIMP_TYPE_OPERATION_ADDITION, GimpOperationAddition))
+#define GIMP_OPERATION_ADDITION_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass),
GIMP_TYPE_OPERATION_ADDITION, GimpOperationAdditionClass))
+#define GIMP_IS_OPERATION_ADDITION(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj),
GIMP_TYPE_OPERATION_ADDITION))
+#define GIMP_IS_OPERATION_ADDITION_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),
GIMP_TYPE_OPERATION_ADDITION))
+#define GIMP_OPERATION_ADDITION_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj),
GIMP_TYPE_OPERATION_ADDITION, GimpOperationAdditionClass))
+
+
+typedef struct _GimpOperationAddition GimpOperationAddition;
+typedef struct _GimpOperationAdditionClass GimpOperationAdditionClass;
+
+struct _GimpOperationAddition
+{
+ GimpOperationPointLayerMode parent_instance;
+};
+
+struct _GimpOperationAdditionClass
+{
+ GimpOperationPointLayerModeClass parent_class;
+};
+
+
+GType gimp_operation_addition_get_type (void) G_GNUC_CONST;
+
+gboolean gimp_operation_addition_process_pixels (gfloat *in,
+ gfloat *layer,
+ gfloat *mask,
+ gfloat *out,
+ gfloat opacity,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level);
+
+#endif /* __GIMP_OPERATION_ADDITION_H__ */
diff --git a/app/operations/layer-modes/gimpoperationsubtract.c
b/app/operations/layer-modes/gimpoperationsubtract.c
new file mode 100644
index 0000000..e39be20
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationsubtract.c
@@ -0,0 +1,135 @@
+/* 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>
+ * 2017 Øyvind Kolås <pippin 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationsubtract.h"
+
+
+static gboolean gimp_operation_subtract_process (GeglOperation *operation,
+ void *in_buf,
+ void *aux_buf,
+ void *aux2_buf,
+ void *out_buf,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level);
+
+
+G_DEFINE_TYPE (GimpOperationSubtract, gimp_operation_subtract,
+ GIMP_TYPE_OPERATION_POINT_LAYER_MODE)
+
+
+static void
+gimp_operation_subtract_class_init (GimpOperationSubtractClass *klass)
+{
+ GeglOperationClass *operation_class;
+ GeglOperationPointComposer3Class *point_class;
+
+ operation_class = GEGL_OPERATION_CLASS (klass);
+ point_class = GEGL_OPERATION_POINT_COMPOSER3_CLASS (klass);
+
+ gegl_operation_class_set_keys (operation_class,
+ "name", "gimp:subtract-mode",
+ "description", "GIMP subtract mode operation",
+ NULL);
+
+ point_class->process = gimp_operation_subtract_process;
+}
+
+static void
+gimp_operation_subtract_init (GimpOperationSubtract *self)
+{
+}
+
+static gboolean
+gimp_operation_subtract_process (GeglOperation *operation,
+ void *in_buf,
+ void *aux_buf,
+ void *aux2_buf,
+ void *out_buf,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level)
+{
+ gfloat opacity = GIMP_OPERATION_POINT_LAYER_MODE (operation)->opacity;
+
+ return gimp_operation_subtract_process_pixels (in_buf, aux_buf, aux2_buf, out_buf, opacity, samples, roi,
level);
+}
+
+gboolean
+gimp_operation_subtract_process_pixels (gfloat *in,
+ gfloat *layer,
+ gfloat *mask,
+ gfloat *out,
+ gfloat opacity,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level)
+{
+ const gboolean has_mask = mask != NULL;
+
+ while (samples--)
+ {
+ gfloat comp_alpha;
+
+ comp_alpha = layer[ALPHA] * opacity;
+ if (has_mask)
+ comp_alpha *= *mask;
+
+ if (comp_alpha != 0.0)
+ {
+ gint b;
+
+ for (b = RED; b < ALPHA; b++)
+ {
+ gfloat comp = in[b] - layer[b];
+ out[b] = comp * comp_alpha + in[b] * (1.0 - comp_alpha);
+ out[b] = CLAMP(out[b], 0.0, 1.0);
+ }
+ }
+ else
+ {
+ gint b;
+
+ for (b = RED; b < ALPHA; b++)
+ {
+ out[b] = in[b];
+ }
+ }
+
+ out[ALPHA] = in[ALPHA];
+
+ in += 4;
+ layer += 4;
+ out += 4;
+
+ if (has_mask)
+ mask++;
+ }
+
+ return TRUE;
+}
diff --git a/app/operations/layer-modes/gimpoperationsubtract.h
b/app/operations/layer-modes/gimpoperationsubtract.h
new file mode 100644
index 0000000..4644d88
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationsubtract.h
@@ -0,0 +1,62 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationsubtractmode.h
+ * Copyright (C) 2008 Michael Natterer <mitch gimp org>
+ * 2017 Øyvind Kolås <pippin 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 <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_SUBTRACT_H__
+#define __GIMP_OPERATION_SUBTRACT_H__
+
+
+#include "../gimpoperationpointlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_SUBTRACT (gimp_operation_subtract_get_type ())
+#define GIMP_OPERATION_SUBTRACT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj),
GIMP_TYPE_OPERATION_SUBTRACT, GimpOperationSubtract))
+#define GIMP_OPERATION_SUBTRACT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass),
GIMP_TYPE_OPERATION_SUBTRACT, GimpOperationSubtractClass))
+#define GIMP_IS_OPERATION_SUBTRACT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj),
GIMP_TYPE_OPERATION_SUBTRACT))
+#define GIMP_IS_OPERATION_SUBTRACT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),
GIMP_TYPE_OPERATION_SUBTRACT))
+#define GIMP_OPERATION_SUBTRACT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj),
GIMP_TYPE_OPERATION_SUBTRACT, GimpOperationSubtractClass))
+
+
+typedef struct _GimpOperationSubtract GimpOperationSubtract;
+typedef struct _GimpOperationSubtractClass GimpOperationSubtractClass;
+
+struct _GimpOperationSubtract
+{
+ GimpOperationPointLayerMode parent_instance;
+};
+
+struct _GimpOperationSubtractClass
+{
+ GimpOperationPointLayerModeClass parent_class;
+};
+
+
+GType gimp_operation_subtract_get_type (void) G_GNUC_CONST;
+
+gboolean gimp_operation_subtract_process_pixels (gfloat *in,
+ gfloat *layer,
+ gfloat *mask,
+ gfloat *out,
+ gfloat opacity,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level);
+
+#endif /* __GIMP_OPERATION_SUBTRACT_H__ */
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