static GeglTile *
gegl_tile_backend_swap_get_tile (GeglTileSource *self,
gint x,
gint y,
gint z)
{
GeglTileBackend *backend;
GeglTileBackendSwap *tile_backend_swap;
SwapEntry *entry;
GeglTile *tile = NULL;
gint tile_size;
backend = GEGL_TILE_BACKEND (self);
tile_backend_swap = GEGL_TILE_BACKEND_SWAP (backend);
entry = gegl_tile_backend_swap_lookup_entry (tile_backend_swap, x, y, z);
if (!entry)
return NULL;
tile_size = gegl_tile_backend_get_tile_size (GEGL_TILE_BACKEND (self));
tile = gegl_tile_new (tile_size);
gegl_tile_mark_as_stored (tile);
gegl_tile_backend_swap_entry_read (tile_backend_swap, entry, gegl_tile_get_data (tile));
return tile;
}
static GeglTile *
get_tile (GeglTileSource *gegl_tile_source,
gint x,
gint y,
gint z)
{
GeglTileSource *source = ((GeglTileHandler *) gegl_tile_source)->source;
GeglTileHandlerEmpty *empty = (GeglTileHandlerEmpty *) gegl_tile_source;
GeglTile *tile = NULL;
if (source)
tile = gegl_tile_source_get_tile (source, x, y, z);
if (tile)
return tile;
if (G_UNLIKELY(!empty->tile))
{
gint tile_size = gegl_tile_backend_get_tile_size (empty->backend);
empty->tile = gegl_tile_new (tile_size);
memset (gegl_tile_get_data (empty->tile), 0x00, tile_size);
empty->tile->is_zero_tile = 1;
}
return gegl_tile_handler_dup_tile (GEGL_TILE_HANDLER (empty),
empty->tile, x, y, z);
}
/* this is the only place that actually should
* instantiate tiles, when the cache is large enough
* that should make sure we don't hit this function
* too often.
*/
static GeglTile *
gegl_tile_backend_file_get_tile (GeglTileSource *self,
gint x,
gint y,
gint z)
{
GeglTileBackend *backend;
GeglTileBackendFile *tile_backend_file;
GeglBufferTile *entry;
GeglTile *tile = NULL;
gint tile_size;
backend = GEGL_TILE_BACKEND (self);
tile_backend_file = GEGL_TILE_BACKEND_FILE (backend);
entry = gegl_tile_backend_file_lookup_entry (tile_backend_file, x, y, z);
if (!entry)
return NULL;
tile_size = gegl_tile_backend_get_tile_size (GEGL_TILE_BACKEND (self));
tile = gegl_tile_new (tile_size);
gegl_tile_set_rev (tile, entry->rev);
gegl_tile_mark_as_stored (tile);
gegl_tile_backend_file_file_entry_read (tile_backend_file, entry, gegl_tile_get_data (tile));
return tile;
}
static GeglTile *
get_tile (GeglTileSource *gegl_tile_source,
gint x,
gint y,
gint z)
{
GeglTileSource *source = ((GeglTileHandler*)(gegl_tile_source))->source;
GeglTileHandlerZoom *zoom = (GeglTileHandlerZoom*)(gegl_tile_source);
GeglTile *tile = NULL;
const Babl *format = gegl_tile_backend_get_format (zoom->backend);
gint tile_width;
gint tile_height;
gint tile_size;
if (source)
{
tile = gegl_tile_source_get_tile (source, x, y, z);
}
if (tile)
return tile;
if (z == 0)/* at base level with no tile found->send null, and shared empty
tile will be used instead */
{
return NULL;
}
if (z>zoom->tile_storage->seen_zoom)
zoom->tile_storage->seen_zoom = z;
g_assert (zoom->backend);
g_object_get (zoom->backend, "tile-width", &tile_width,
"tile-height", &tile_height,
"tile-size", &tile_size,
NULL);
{
gint i, j;
GeglTile *source_tile[2][2] = { { NULL, NULL }, { NULL, NULL } };
for (i = 0; i < 2; i++)
for (j = 0; j < 2; j++)
{
/* we get the tile from ourselves, to make successive rescales work
* correctly */
source_tile[i][j] = gegl_tile_source_get_tile (gegl_tile_source,
x * 2 + i, y * 2 + j, z - 1);
}
if (source_tile[0][0] == NULL &&
source_tile[0][1] == NULL &&
source_tile[1][0] == NULL &&
source_tile[1][1] == NULL)
{
return NULL; /* no data from level below, return NULL and let GeglTileHandlerEmpty
fill in the shared empty tile */
}
g_assert (tile == NULL);
if (tile == NULL)
{
tile = gegl_tile_new (tile_size);
tile->x = x;
tile->y = y;
tile->z = z;
tile->tile_storage = zoom->tile_storage;
if (zoom->cache)
gegl_tile_handler_cache_insert (zoom->cache, tile, x, y, z);
}
gegl_tile_lock (tile);
for (i = 0; i < 2; i++)
for (j = 0; j < 2; j++)
{
if (source_tile[i][j])
{
set_half (tile, source_tile[i][j], tile_width, tile_height, format, i, j);
gegl_tile_unref (source_tile[i][j]);
}
else
{
set_blank (tile, tile_width, tile_height, format, i, j);
}
}
gegl_tile_unlock (tile);
}
return tile;
}
