fcurve_cache.c

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/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
 
#include <stdlib.h>
#include <string.h>
 
#include "MEM_guardedalloc.h"
 
#include "DNA_anim_types.h"
 
#include "BLI_ghash.h"
#include "BLI_listbase.h"
 
#include "BKE_fcurve.h"
 
/* -------------------------------------------------------------------- */
struct FCurvePathCache_Span {
  uint index;
  uint len;
};
 
struct FCurvePathCache {
  FCurve **fcurve_array;
  uint fcurve_array_len;
  struct FCurvePathCache_Span *span_table;
  GHash *span_from_rna_path;
};
 
static int fcurve_cmp_for_cache(const void *fcu_a_p, const void *fcu_b_p)
{
  const FCurve *fcu_a = *((const FCurve **)fcu_a_p);
  const FCurve *fcu_b = *((const FCurve **)fcu_b_p);
  const int cmp = strcmp(fcu_a->rna_path, fcu_b->rna_path);
  if (cmp != 0) {
    return cmp;
  }
  if (fcu_a->array_index < fcu_b->array_index) {
    return -1;
  }
  if (fcu_a->array_index > fcu_b->array_index) {
    return 1;
  }
  return 0;
}
 
struct FCurvePathCache *BKE_fcurve_pathcache_create(ListBase *list)
{
  const uint fcurve_array_len = BLI_listbase_count(list);
  FCurve **fcurve_array = MEM_mallocN(sizeof(*fcurve_array) * fcurve_array_len, __func__);
  uint i;
  LISTBASE_FOREACH_INDEX (FCurve *, fcu, list, i) {
    fcurve_array[i] = fcu;
  }
  qsort(fcurve_array, fcurve_array_len, sizeof(FCurve *), fcurve_cmp_for_cache);
 
  /* Allow for the case no F-curves share an RNA-path, otherwise this is over-allocated.
   * Although in practice it's likely to only be 3-4x as large as is needed
   * (with transform channels for e.g.). */
  struct FCurvePathCache_Span *span_table = MEM_mallocN(sizeof(*span_table) * fcurve_array_len,
                                                        __func__);
 
  /* May over reserve, harmless. */
  GHash *span_from_rna_path = BLI_ghash_str_new_ex(__func__, fcurve_array_len);
  uint span_index = 0;
  i = 0;
  while (i < fcurve_array_len) {
    uint i_end;
    for (i_end = i + 1; i_end < fcurve_array_len; i_end++) {
      /* As the indices are sorted, we know a decrease means a new RNA path is found. */
      if (fcurve_array[i]->array_index > fcurve_array[i_end]->array_index) {
        BLI_assert(!STREQ(fcurve_array[i]->rna_path, fcurve_array[i_end]->rna_path));
        break;
      }
      if (!STREQ(fcurve_array[i]->rna_path, fcurve_array[i_end]->rna_path)) {
        break;
      }
    }
 
    struct FCurvePathCache_Span *span = &span_table[span_index++];
    span->index = i;
    span->len = i_end - i;
    BLI_ghash_insert(span_from_rna_path, fcurve_array[i]->rna_path, span);
    i = i_end;
  }
 
  struct FCurvePathCache *fcache = MEM_callocN(sizeof(struct FCurvePathCache), __func__);
  fcache->fcurve_array = fcurve_array;
  fcache->fcurve_array_len = fcurve_array_len;
  fcache->span_table = span_table;
  fcache->span_from_rna_path = span_from_rna_path;
 
  return fcache;
}
 
void BKE_fcurve_pathcache_destroy(struct FCurvePathCache *fcache)
{
  MEM_freeN(fcache->fcurve_array);
  MEM_freeN(fcache->span_table);
  BLI_ghash_free(fcache->span_from_rna_path, NULL, NULL);
  MEM_freeN(fcache);
}
 
FCurve *BKE_fcurve_pathcache_find(struct FCurvePathCache *fcache,
                                  const char *rna_path,
                                  const int array_index)
{
  const struct FCurvePathCache_Span *span = BLI_ghash_lookup(fcache->span_from_rna_path, rna_path);
  if (span == NULL) {
    return NULL;
  }
 
  FCurve **fcurve = fcache->fcurve_array + span->index;
  const uint len = span->len;
  for (int i = 0; i < len; i++) {
    if (fcurve[i]->array_index == array_index) {
      return fcurve[i];
    }
    /* As these are sorted, early exit. */
    if (fcurve[i]->array_index > array_index) {
      break;
    }
  }
  return NULL;
}
 
int BKE_fcurve_pathcache_find_array(struct FCurvePathCache *fcache,
                                    const char *rna_path,
                                    FCurve **fcurve_result,
                                    int fcurve_result_len)
{
  memset(fcurve_result, 0x0, sizeof(*fcurve_result) * fcurve_result_len);
 
  const struct FCurvePathCache_Span *span = BLI_ghash_lookup(fcache->span_from_rna_path, rna_path);
  if (span == NULL) {
    return 0;
  }
 
  int found = 0;
  FCurve **fcurve = fcache->fcurve_array + span->index;
  const uint len = span->len;
  for (int i = 0; i < len; i++) {
    /* As these are sorted, early exit. */
    if ((uint)fcurve[i]->array_index > (uint)fcurve_result_len) {
      break;
    }
    fcurve_result[fcurve[i]->array_index] = fcurve[i];
    found += 1;
  }
  return found;
}