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50ccd73592
To give us less changes of incorrect values when converting between scales (at the cost of 2x the array size).
104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
/* pointcache.c
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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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#define G_LOG_DOMAIN "pointcache"
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#include "util/pointcache.h"
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struct _PointCache
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{
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volatile gint ref_count;
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GHashTable *sets;
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};
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static void
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point_cache_destroy (PointCache *self)
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{
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g_clear_pointer (&self->sets, g_hash_table_unref);
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g_slice_free (PointCache, self);
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}
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PointCache *
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point_cache_ref (PointCache *self)
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{
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g_return_val_if_fail (self->ref_count > 0, NULL);
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g_atomic_int_inc (&self->ref_count);
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return self;
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}
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void
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point_cache_unref (PointCache *self)
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{
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g_return_if_fail (self->ref_count > 0);
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if (g_atomic_int_dec_and_test (&self->ref_count))
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point_cache_destroy (self);
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}
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PointCache *
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point_cache_new (void)
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{
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PointCache *self;
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self = g_slice_new0 (PointCache);
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self->ref_count = 1;
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self->sets = g_hash_table_new_full (NULL, NULL, NULL, (GDestroyNotify)g_array_unref);
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return self;
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}
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void
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point_cache_add_set (PointCache *self,
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guint set_id)
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{
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g_hash_table_insert (self->sets,
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GUINT_TO_POINTER (set_id),
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g_array_new (FALSE, FALSE, sizeof (Point)));
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}
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gboolean
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point_cache_contains_set (PointCache *self,
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guint set_id)
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{
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return g_hash_table_contains (self->sets, GUINT_TO_POINTER (set_id));
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}
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void
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point_cache_add_point_to_set (PointCache *self,
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guint set_id,
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gdouble x,
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gdouble y)
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{
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GArray *ar;
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Point point = { x, y };
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ar = g_hash_table_lookup (self->sets, GUINT_TO_POINTER (set_id));
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g_array_append_val (ar, point);
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}
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const Point *
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point_cache_get_points (PointCache *self,
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guint set_id,
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guint *n_points)
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{
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GArray *ar;
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ar = g_hash_table_lookup (self->sets, GUINT_TO_POINTER (set_id));
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*n_points = ar->len;
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return &g_array_index (ar, const Point, 0);
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}
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