/* Find existing tile, make a new tile, or if we have a full set of tiles,
* reuse LRU.
*/
static Tile *
tile_find( Read *read, REGION *in, int x, int y )
{
Tile *tile;
int oldest;
GSList *p;
/* In cache already?
*/
if( (tile = tile_search( read, x, y )) ) {
tile_touch( tile );
return( tile );
}
/* Cache not full?
*/
if( read->max_tiles == -1 ||
read->ntiles < read->max_tiles ) {
if( !(tile = tile_new( read )) ||
tile_move( tile, x, y ) ||
tile_fill( tile, in ) )
return( NULL );
return( tile );
}
/* Reuse an old one.
*/
oldest = read->time;
tile = NULL;
for( p = read->cache; p; p = p->next ) {
Tile *t = (Tile *) p->data;
if( t->time < oldest ) {
oldest = t->time;
tile = t;
}
}
g_assert( tile );
#ifdef DEBUG
printf( "im_tile_cache: reusing tile %d x %d\n", tile->x, tile->y );
#endif /*DEBUG*/
if( tile_move( tile, x, y ) ||
tile_fill( tile, in ) )
return( NULL );
return( tile );
}
/* Find existing tile, make a new tile, or if we have a full set of tiles,
* reuse LRU.
*/
static Tile *
tile_find( VipsTileCache *cache, VipsRegion *in, int x, int y )
{
Tile *tile;
int oldest, topmost;
GSList *p;
/* In cache already?
*/
if( (tile = tile_search( cache, x, y )) ) {
tile_touch( tile );
return( tile );
}
/* VipsTileCache not full?
*/
if( cache->max_tiles == -1 ||
cache->ntiles < cache->max_tiles ) {
if( !(tile = tile_new( cache )) ||
tile_move( tile, x, y ) ||
tile_fill( tile, in ) )
return( NULL );
return( tile );
}
/* Reuse an old one.
*/
switch( cache->strategy ) {
case VIPS_CACHE_RANDOM:
oldest = cache->time;
tile = NULL;
for( p = cache->tiles; p; p = p->next ) {
Tile *t = (Tile *) p->data;
if( t->time < oldest ) {
oldest = t->time;
tile = t;
}
}
break;
case VIPS_CACHE_SEQUENTIAL:
topmost = cache->in->Ysize;
tile = NULL;
for( p = cache->tiles; p; p = p->next ) {
Tile *t = (Tile *) p->data;
if( t->y < topmost ) {
topmost = t->y;
tile = t;
}
}
break;
default:
g_assert( 0 );
}
g_assert( tile );
VIPS_DEBUG_MSG( "tilecache: reusing tile %d x %d\n", tile->x, tile->y );
if( tile_move( tile, x, y ) ||
tile_fill( tile, in ) )
return( NULL );
return( tile );
}