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-rw-r--r--app/operations/layer-modes/gimpoperationreplace.c347
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diff --git a/app/operations/layer-modes/gimpoperationreplace.c b/app/operations/layer-modes/gimpoperationreplace.c
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+++ b/app/operations/layer-modes/gimpoperationreplace.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationreplace.c
+ * 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 <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimp-layer-modes.h"
+#include "gimpoperationreplace.h"
+
+
+static GeglRectangle gimp_operation_replace_get_bounding_box (GeglOperation *op);
+
+static gboolean gimp_operation_replace_parent_process (GeglOperation *op,
+ GeglOperationContext *context,
+ const gchar *output_prop,
+ const GeglRectangle *result,
+ gint level);
+static gboolean gimp_operation_replace_process (GeglOperation *op,
+ void *in,
+ void *layer,
+ void *mask,
+ void *out,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level);
+static GimpLayerCompositeRegion gimp_operation_replace_get_affected_region (GimpOperationLayerMode *layer_mode);
+
+
+G_DEFINE_TYPE (GimpOperationReplace, gimp_operation_replace,
+ GIMP_TYPE_OPERATION_LAYER_MODE)
+
+#define parent_class gimp_operation_replace_parent_class
+
+
+static void
+gimp_operation_replace_class_init (GimpOperationReplaceClass *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:replace",
+ "description", "GIMP replace mode operation",
+ NULL);
+
+ operation_class->get_bounding_box = gimp_operation_replace_get_bounding_box;
+
+ layer_mode_class->parent_process = gimp_operation_replace_parent_process;
+ layer_mode_class->process = gimp_operation_replace_process;
+ layer_mode_class->get_affected_region = gimp_operation_replace_get_affected_region;
+}
+
+static void
+gimp_operation_replace_init (GimpOperationReplace *self)
+{
+}
+
+static GeglRectangle
+gimp_operation_replace_get_bounding_box (GeglOperation *op)
+{
+ GimpOperationLayerMode *self = (gpointer) op;
+ GeglRectangle *in_rect;
+ GeglRectangle *aux_rect;
+ GeglRectangle *aux2_rect;
+ GeglRectangle src_rect = {};
+ GeglRectangle dst_rect = {};
+ GeglRectangle result;
+ GimpLayerCompositeRegion included_region;
+
+ in_rect = gegl_operation_source_get_bounding_box (op, "input");
+ aux_rect = gegl_operation_source_get_bounding_box (op, "aux");
+ aux2_rect = gegl_operation_source_get_bounding_box (op, "aux2");
+
+ if (in_rect)
+ dst_rect = *in_rect;
+
+ if (aux_rect)
+ {
+ src_rect = *aux_rect;
+
+ if (aux2_rect)
+ gegl_rectangle_intersect (&src_rect, &src_rect, aux2_rect);
+ }
+
+ if (self->is_last_node)
+ {
+ included_region = GIMP_LAYER_COMPOSITE_REGION_SOURCE;
+ }
+ else
+ {
+ included_region = gimp_layer_mode_get_included_region (self->layer_mode,
+ self->composite_mode);
+ }
+
+ if (self->prop_opacity == 0.0)
+ included_region &= ~GIMP_LAYER_COMPOSITE_REGION_SOURCE;
+ else if (self->prop_opacity == 1.0 && ! aux2_rect)
+ included_region &= ~GIMP_LAYER_COMPOSITE_REGION_DESTINATION;
+
+ gegl_rectangle_intersect (&result, &src_rect, &dst_rect);
+
+ if (included_region & GIMP_LAYER_COMPOSITE_REGION_SOURCE)
+ gegl_rectangle_bounding_box (&result, &result, &src_rect);
+
+ if (included_region & GIMP_LAYER_COMPOSITE_REGION_DESTINATION)
+ gegl_rectangle_bounding_box (&result, &result, &dst_rect);
+
+ return result;
+}
+
+static gboolean
+gimp_operation_replace_parent_process (GeglOperation *op,
+ GeglOperationContext *context,
+ const gchar *output_prop,
+ const GeglRectangle *result,
+ gint level)
+{
+ GimpOperationLayerMode *layer_mode = (gpointer) op;
+ GimpLayerCompositeRegion included_region;
+
+ included_region = gimp_layer_mode_get_included_region
+ (layer_mode->layer_mode, layer_mode->composite_mode);
+
+ /* if the layer's opacity is 100%, it has no mask, and its composite mode
+ * contains "aux" (the latter should always be the case in practice,
+ * currently,) we can just pass "aux" directly as output.
+ */
+ if (layer_mode->opacity == 1.0 &&
+ ! gegl_operation_context_get_object (context, "aux2") &&
+ (included_region & GIMP_LAYER_COMPOSITE_REGION_SOURCE))
+ {
+ GObject *aux;
+
+ aux = gegl_operation_context_get_object (context, "aux");
+
+ gegl_operation_context_set_object (context, "output", aux);
+
+ return TRUE;
+ }
+ /* the opposite case, where the opacity is 0%, is handled by
+ * GimpOperationLayerMode.
+ */
+ else if (layer_mode->opacity == 0.0)
+ {
+ }
+ /* if both buffers are included in the result, and if both of them have the
+ * same content -- i.e., if they share the same storage, same alignment, and
+ * same abyss (or if the abyss is irrelevant) -- we can just pass either of
+ * them directly as output.
+ */
+ else if (included_region == GIMP_LAYER_COMPOSITE_REGION_UNION)
+ {
+ GObject *input;
+ GObject *aux;
+
+ input = gegl_operation_context_get_object (context, "input");
+ aux = gegl_operation_context_get_object (context, "aux");
+
+ if (input && aux &&
+ gegl_buffer_share_storage (GEGL_BUFFER (input), GEGL_BUFFER (aux)))
+ {
+ gint input_shift_x;
+ gint input_shift_y;
+ gint aux_shift_x;
+ gint aux_shift_y;
+
+ g_object_get (input,
+ "shift-x", &input_shift_x,
+ "shift-y", &input_shift_y,
+ NULL);
+ g_object_get (aux,
+ "shift-x", &aux_shift_x,
+ "shift-y", &aux_shift_y,
+ NULL);
+
+ if (input_shift_x == aux_shift_x && input_shift_y == aux_shift_y)
+ {
+ const GeglRectangle *input_abyss;
+ const GeglRectangle *aux_abyss;
+
+ input_abyss = gegl_buffer_get_abyss (GEGL_BUFFER (input));
+ aux_abyss = gegl_buffer_get_abyss (GEGL_BUFFER (aux));
+
+ if (gegl_rectangle_equal (input_abyss, aux_abyss) ||
+ (gegl_rectangle_contains (input_abyss, result) &&
+ gegl_rectangle_contains (aux_abyss, result)))
+ {
+ gegl_operation_context_set_object (context, "output", input);
+
+ return TRUE;
+ }
+ }
+ }
+ }
+
+ return GIMP_OPERATION_LAYER_MODE_CLASS (parent_class)->parent_process (
+ op, context, output_prop, result, level);
+}
+
+static gboolean
+gimp_operation_replace_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;
+ const gboolean has_mask = mask != NULL;
+
+ switch (layer_mode->composite_mode)
+ {
+ case GIMP_LAYER_COMPOSITE_UNION:
+ case GIMP_LAYER_COMPOSITE_AUTO:
+ while (samples--)
+ {
+ gfloat opacity_value = opacity;
+ gfloat new_alpha;
+ gfloat ratio;
+ gint b;
+
+ if (has_mask)
+ opacity_value *= *mask;
+
+ new_alpha = (layer[ALPHA] - in[ALPHA]) * opacity_value + in[ALPHA];
+
+ ratio = opacity_value;
+
+ if (new_alpha)
+ ratio *= layer[ALPHA] / new_alpha;
+
+ for (b = RED; b < ALPHA; b++)
+ out[b] = (layer[b] - in[b]) * ratio + in[b];
+
+ out[ALPHA] = new_alpha;
+
+ in += 4;
+ layer += 4;
+ out += 4;
+
+ if (has_mask)
+ mask++;
+ }
+ break;
+
+ case GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP:
+ while (samples--)
+ {
+ gfloat opacity_value = opacity;
+ gfloat new_alpha;
+ gint b;
+
+ if (has_mask)
+ opacity_value *= *mask;
+
+ new_alpha = in[ALPHA] * (1.0f - opacity_value);
+
+ for (b = RED; b < ALPHA; b++)
+ out[b] = in[b];
+
+ out[ALPHA] = new_alpha;
+
+ in += 4;
+ out += 4;
+
+ if (has_mask)
+ mask++;
+ }
+ break;
+
+ case GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER:
+ while (samples--)
+ {
+ gfloat opacity_value = opacity;
+ gfloat new_alpha;
+ gint b;
+
+ if (has_mask)
+ opacity_value *= *mask;
+
+ new_alpha = layer[ALPHA] * opacity_value;
+
+ for (b = RED; b < ALPHA; b++)
+ out[b] = layer[b];
+
+ out[ALPHA] = new_alpha;
+
+ in += 4;
+ layer += 4;
+ out += 4;
+
+ if (has_mask)
+ mask++;
+ }
+ break;
+
+ case GIMP_LAYER_COMPOSITE_INTERSECTION:
+ memset (out, 0, 4 * samples * sizeof (gfloat));
+ break;
+ }
+
+ return TRUE;
+}
+
+static GimpLayerCompositeRegion
+gimp_operation_replace_get_affected_region (GimpOperationLayerMode *layer_mode)
+{
+ GimpLayerCompositeRegion affected_region = GIMP_LAYER_COMPOSITE_REGION_INTERSECTION;
+
+ if (layer_mode->prop_opacity != 0.0)
+ affected_region |= GIMP_LAYER_COMPOSITE_REGION_DESTINATION;
+
+ /* if opacity != 1.0, or we have a mask, then we also affect SOURCE, but this
+ * is considered the case anyway, so no need for special handling.
+ */
+
+ return affected_region;
+}
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