f0aec02dff
In pass-through mode, the group layer-stack's input is connected to
the backdrop. However, when rendering the group's projection, we
want to render the stack independently of the backdrop.
Unfortunately, we can't use the stack's graph as a subgraph of two
different graphs.
To work around that, the next few commits add a mechanism for a
projectable to be notified before and after its graph is being
rendered. We use this mechanism to disconnect the stack's graph
from the backdrop before rendering the projection, and reconnect
it afterwards. Yep, it's ugly, but it's better than having to
maintain n copies of (each node of) the graph (each nesting level
requires an extra copy.)
This commit adds {begin,end}_render() functions to GimpProjectable.
These functions should be called right before/after rendering the
projectable's graph.
88 lines
4.4 KiB
C
88 lines
4.4 KiB
C
/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
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*
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* gimpprojectable.h
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* Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
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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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#ifndef __GIMP_PROJECTABLE_H__
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#define __GIMP_PROJECTABLE_H__
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#define GIMP_TYPE_PROJECTABLE (gimp_projectable_interface_get_type ())
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#define GIMP_IS_PROJECTABLE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_PROJECTABLE))
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#define GIMP_PROJECTABLE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_PROJECTABLE, GimpProjectable))
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#define GIMP_PROJECTABLE_GET_INTERFACE(obj) (G_TYPE_INSTANCE_GET_INTERFACE ((obj), GIMP_TYPE_PROJECTABLE, GimpProjectableInterface))
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typedef struct _GimpProjectableInterface GimpProjectableInterface;
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struct _GimpProjectableInterface
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{
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GTypeInterface base_iface;
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/* signals */
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void (* invalidate) (GimpProjectable *projectable,
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gint x,
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gint y,
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gint width,
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gint height);
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void (* flush) (GimpProjectable *projectable,
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gboolean invalidate_preview);
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void (* structure_changed) (GimpProjectable *projectable);
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/* virtual functions */
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GimpImage * (* get_image) (GimpProjectable *projectable);
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const Babl * (* get_format) (GimpProjectable *projectable);
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void (* get_offset) (GimpProjectable *projectable,
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gint *x,
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gint *y);
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void (* get_size) (GimpProjectable *projectable,
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gint *width,
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gint *height);
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GeglNode * (* get_graph) (GimpProjectable *projectable);
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void (* begin_render) (GimpProjectable *projectable);
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void (* end_render) (GimpProjectable *projectable);
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void (* invalidate_preview) (GimpProjectable *projectable);
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};
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GType gimp_projectable_interface_get_type (void) G_GNUC_CONST;
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void gimp_projectable_invalidate (GimpProjectable *projectable,
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gint x,
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gint y,
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gint width,
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gint height);
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void gimp_projectable_flush (GimpProjectable *projectable,
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gboolean preview_invalidated);
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void gimp_projectable_structure_changed (GimpProjectable *projectable);
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GimpImage * gimp_projectable_get_image (GimpProjectable *projectable);
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const Babl * gimp_projectable_get_format (GimpProjectable *projectable);
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void gimp_projectable_get_offset (GimpProjectable *projectable,
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gint *x,
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gint *y);
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void gimp_projectable_get_size (GimpProjectable *projectable,
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gint *width,
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gint *height);
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GeglNode * gimp_projectable_get_graph (GimpProjectable *projectable);
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void gimp_projectable_begin_render (GimpProjectable *projectable);
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void gimp_projectable_end_render (GimpProjectable *projectable);
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void gimp_projectable_invalidate_preview (GimpProjectable *projectable);
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#endif /* __GIMP_PROJECTABLE_H__ */
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