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7917611e53
2007-06-06 Martin Nordholts <martinn@svn.gnome.org> Implemented an image pyramid for the GimpProjection. An image pyramid caches a projection at several sizes, causing the rendering code not to have to swap in all tiles of a (potentially) large image; it can use small versions of the projection if the user is zoomed out. The image pyramid also imroves visual quality, especially at zoom levels where there is a pyramid level that matches perfectly (i.e. at e.g. 50%, 25%, and 12.5% zoom). A step on the right track for bug #76096. * app/core/gimpprojection.[ch]: Adjusted to make use of an image pyramid. GimpProjection now keeps an array of TileManager:s, one per pyramid level. Renamed _alloc_tiles to _alloc_levels. * app/display/gimpdisplayshell-draw.c: (gimp_display_shell_draw_area): Use the right GimpProjection level when drawing * app/display/gimpdisplayshell-render.c: (render_image_init_info_full): Setup RenderInfo with level in mind * app/base/tile-manager.[ch]: Extended API a bit, nothing complicated. * app/base/tile-manager-private.h (struct _TileManager): Keep a pointer to the level below for use in an image pyramid. svn path=/trunk/; revision=22727
120 lines
4.6 KiB
C
120 lines
4.6 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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* 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 2 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef __GIMP_PROJECTION_H__
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#define __GIMP_PROJECTION_H__
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#include "gimpobject.h"
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typedef struct _GimpProjectionIdleRender GimpProjectionIdleRender;
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struct _GimpProjectionIdleRender
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{
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gint width;
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gint height;
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gint x;
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gint y;
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gint base_x;
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gint base_y;
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guint idle_id;
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GSList *update_areas; /* flushed update areas */
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};
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#define GIMP_TYPE_PROJECTION (gimp_projection_get_type ())
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#define GIMP_PROJECTION(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_PROJECTION, GimpProjection))
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#define GIMP_PROJECTION_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_PROJECTION, GimpProjectionClass))
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#define GIMP_IS_PROJECTION(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_PROJECTION))
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#define GIMP_IS_PROJECTION_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_PROJECTION))
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#define GIMP_PROJECTION_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_PROJECTION, GimpProjectionClass))
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#define PYRAMID_MAX_LEVELS 10
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#define PYRAMID_BASE_LEVEL 0
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typedef struct _GimpProjectionClass GimpProjectionClass;
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struct _GimpProjection
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{
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GimpObject parent_instance;
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GimpImage *image;
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GimpImageType type;
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gint bytes;
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/* An image pyramid. Level n + 1 has half the width and height of level n. */
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TileManager *pyramid[PYRAMID_MAX_LEVELS];
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gint top_level;
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GSList *update_areas;
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GimpProjectionIdleRender idle_render;
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gboolean construct_flag;
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};
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struct _GimpProjectionClass
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{
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GimpObjectClass parent_class;
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void (* update) (GimpProjection *image,
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gboolean now,
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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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};
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GType gimp_projection_get_type (void) G_GNUC_CONST;
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GimpProjection * gimp_projection_new (GimpImage *image);
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TileManager * gimp_projection_get_tiles (GimpProjection *proj);
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TileManager * gimp_projection_get_tiles_at_level
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(GimpProjection *proj,
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gint level);
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void gimp_projection_level_size_from_scale
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(GimpProjection *proj,
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gdouble scalex,
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gint *level,
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gint *width,
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gint *height);
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gint gimp_projection_scale_to_level (GimpProjection *proj,
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gdouble scalex);
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GimpImage * gimp_projection_get_image (const GimpProjection *proj);
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GimpImageType gimp_projection_get_image_type (const GimpProjection *proj);
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gint gimp_projection_get_bytes (const GimpProjection *proj);
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gdouble gimp_projection_get_opacity (const GimpProjection *proj);
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void gimp_projection_flush (GimpProjection *proj);
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void gimp_projection_flush_now (GimpProjection *proj);
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void gimp_projection_finish_draw (GimpProjection *proj);
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gint64 gimp_projection_estimate_memsize (GimpImageBaseType type,
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gint width,
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gint height);
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#endif /* __GIMP_PROJECTION_H__ */
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