5effdd03b4
Pass through mode uses the same compositing logic as REPLACE mode, however, it's a special case of REPLACE, where the layer is already composited against the backdrop. This allows us to take a few shortcuts that aren't generally applicable to REPLACE mode. Add a dedicated op class for pass through mode, derived from the REPLACE mode op, implementing these shortcuts.
107 lines
4.2 KiB
C
107 lines
4.2 KiB
C
/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* gimpoperationpassthrough.c
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* Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
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* 2017 Ell
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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 <http://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 "gimp-layer-modes.h"
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#include "gimpoperationpassthrough.h"
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static gboolean gimp_operation_pass_through_parent_process (GeglOperation *operation,
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GeglOperationContext *context,
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const gchar *output_prop,
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const GeglRectangle *result,
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gint level);
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G_DEFINE_TYPE (GimpOperationPassThrough, gimp_operation_pass_through,
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GIMP_TYPE_OPERATION_REPLACE)
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#define parent_class gimp_operation_pass_through_parent_class
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static void
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gimp_operation_pass_through_class_init (GimpOperationPassThroughClass *klass)
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{
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GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
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GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
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gegl_operation_class_set_keys (operation_class,
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"name", "gimp:pass-through",
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"description", "GIMP pass through mode operation",
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NULL);
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operation_class->process = gimp_operation_pass_through_parent_process;
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/* don't use REPLACE mode's specialized get_affected_region(); PASS_THROUGH
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* behaves like an ordinary layer mode here.
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*/
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layer_mode_class->get_affected_region = NULL;
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}
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static void
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gimp_operation_pass_through_init (GimpOperationPassThrough *self)
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{
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}
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static gboolean
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gimp_operation_pass_through_parent_process (GeglOperation *operation,
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GeglOperationContext *context,
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const gchar *output_prop,
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const GeglRectangle *result,
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gint level)
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{
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GimpOperationLayerMode *layer_mode = (gpointer) operation;
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/* if the layer's opacity is 100%, it has no mask, and its composite mode
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* contains "aux" (the latter should always be the case for pass through
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* mode,) we can just pass "aux" directly as output. note that the same
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* optimization would more generally apply to REPLACE mode, save for the fact
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* that when both the backdrop and the layer have a pixel with 0% alpha, we
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* want to maintain the color value of the backdrop, not the layer; since,
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* for pass through groups, the layer is already composited against the
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* backdrop, such pixels will have the same color value for both the backdrop
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* and the layer.
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*/
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if (layer_mode->opacity == 1.0 &&
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! gegl_operation_context_get_object (context, "aux2") &&
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(gimp_layer_mode_get_included_region (layer_mode->layer_mode,
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layer_mode->real_composite_mode) &
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GIMP_LAYER_COMPOSITE_REGION_SOURCE))
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{
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GObject *aux;
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aux = gegl_operation_context_get_object (context, "aux");
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gegl_operation_context_set_object (context, "output", aux);
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return TRUE;
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}
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return GEGL_OPERATION_CLASS (parent_class)->process (operation, context,
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output_prop, result,
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level);
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}
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