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571c2320da
This is a simple cache that keeps x,y pairs for use when drawing visualizers. To keep this generic, and save on memory, we simply store the x,y coordinates as floats between 0.0 and 1.0. This saves us roughly 50% on each data point over the 2 8-byte numbers we would otherwise store. Obviously, we could take this further and make some fancy index storage with run-length-encode values, but this should work for now and allow us to get more exotic later.
54 lines
1.8 KiB
C
54 lines
1.8 KiB
C
/* pointcache.h
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*
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* Copyright (C) 2016 Christian Hergert <chergert@redhat.com>
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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 POINT_CACHE_H
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#define POINT_CACHE_H
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#include <glib.h>
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G_BEGIN_DECLS
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typedef struct _PointCache PointCache;
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typedef struct
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{
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gfloat x;
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gfloat y;
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} Point;
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PointCache *point_cache_new (void);
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PointCache *point_cache_ref (PointCache *self);
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void point_cache_unref (PointCache *self);
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void point_cache_add_set (PointCache *self,
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guint set_id);
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gboolean point_cache_contains_set (PointCache *self,
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guint set_id);
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void point_cache_add_point_to_set (PointCache *self,
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guint set_id,
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gfloat x,
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gfloat y);
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const Point *point_cache_get_points (PointCache *self,
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guint set_id,
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guint *n_points);
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G_DEFINE_AUTOPTR_CLEANUP_FUNC (PointCache, point_cache_unref)
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G_END_DECLS
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#endif /* POINT_CACHE_H */
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