gboolean
gegl_tile_backend_file_try_lock (GeglTileBackendFile *self)
{
GeglBufferHeader new_header;
new_header = gegl_buffer_read_header (self->i, NULL)->header;
if (new_header.flags & GEGL_FLAG_LOCKED)
{
return FALSE;
}
self->header.flags += GEGL_FLAG_LOCKED;
gegl_tile_backend_file_write_header (self);
fsync (self->o);
return TRUE;
}
gboolean
gegl_tile_backend_file_try_lock (GeglTileBackendFile *self)
{
GeglBufferHeader new_header;
new_header = gegl_buffer_read_header (self->i, NULL)->header;
if (new_header.flags & GEGL_FLAG_LOCKED)
{
return FALSE;
}
self->header.flags += GEGL_FLAG_LOCKED;
gegl_tile_backend_file_write_header (self);
#if HAVE_GIO
g_output_stream_flush (self->o, NULL, NULL);
#else
fsync (self->o);
#endif
return TRUE;
}
GeglBuffer *
gegl_buffer_load (const gchar *path)
{
GeglBuffer *ret;
LoadInfo *info = g_slice_new0 (LoadInfo);
info->path = g_strdup (path);
info->i = g_open (info->path, O_RDONLY, 0770);
GEGL_NOTE (GEGL_DEBUG_BUFFER_LOAD, "starting to load buffer %s", path);
if (info->i == -1)
{
GEGL_NOTE (GEGL_DEBUG_BUFFER_LOAD, "failed top open %s for reading", path);
return NULL;
}
{
GeglBufferItem *header = gegl_buffer_read_header (info->i, &info->offset);
g_assert (header);
/*memcpy (&(info->header), header, sizeof (GeglBufferHeader));*/
info->header = *(&header->header);
info->offset = info->header.next;
/*g_free (header);*/ /* is there a pointer to a string or something we're missing? */
}
info->tile_size = info->header.tile_width *
info->header.tile_height *
info->header.bytes_per_pixel;
info->format = babl_format (info->header.description);
ret = g_object_new (GEGL_TYPE_BUFFER,
"format", info->format,
"tile-width", info->header.tile_width,
"tile-height", info->header.tile_height,
"height", info->header.height,
"width", info->header.width,
"path", path,
NULL);
/* sanity check, should probably report error condition and return safely instead
*/
g_assert (babl_format_get_bytes_per_pixel (info->format) == info->header.bytes_per_pixel);
info->tiles = gegl_buffer_read_index (info->i, &info->offset);
/* load each tile */
{
GList *iter;
gint i = 0;
for (iter = info->tiles; iter; iter = iter->next)
{
GeglBufferTile *entry = iter->data;
guchar *data;
GeglTile *tile;
tile = gegl_tile_source_get_tile (GEGL_TILE_SOURCE (ret),
entry->x,
entry->y,
entry->z);
if (info->offset != entry->offset)
{
seekto (info, entry->offset);
}
/*g_assert (info->offset == entry->offset);*/
g_assert (tile);
gegl_tile_lock (tile);
data = gegl_tile_get_data (tile);
g_assert (data);
{
ssize_t sz_read = read (info->i, data, info->tile_size);
if(sz_read != -1)
info->offset += sz_read;
}
/*g_assert (info->offset == entry->offset + info->tile_size);*/
gegl_tile_unlock (tile);
gegl_tile_unref (tile);
i++;
}
GEGL_NOTE (GEGL_DEBUG_BUFFER_LOAD, "%i tiles loaded",i);
}
GEGL_NOTE (GEGL_DEBUG_BUFFER_LOAD, "buffer loaded %s", info->path);
load_info_destroy (info);
return ret;
}
static GObject *
gegl_tile_backend_file_constructor (GType type,
guint n_params,
GObjectConstructParam *params)
{
GObject *object;
GeglTileBackendFile *self;
GeglTileBackend *backend;
object = G_OBJECT_CLASS (parent_class)->constructor (type, n_params, params);
self = GEGL_TILE_BACKEND_FILE (object);
backend = GEGL_TILE_BACKEND (object);
GEGL_NOTE (GEGL_DEBUG_TILE_BACKEND, "constructing file backend: %s", self->path);
self->file = g_file_new_for_commandline_arg (self->path);
self->i = self->o = -1;
self->index = g_hash_table_new (gegl_tile_backend_file_hashfunc, gegl_tile_backend_file_equalfunc);
/* If the file already exists open it, assuming it is a GeglBuffer. */
if (g_access (self->path, F_OK) != -1)
{
goffset offset = 0;
/* Install a monitor for changes to the file in case other applications
* might be writing to the buffer
*/
self->monitor = g_file_monitor_file (self->file, G_FILE_MONITOR_NONE,
NULL, NULL);
g_signal_connect (self->monitor, "changed",
G_CALLBACK (gegl_tile_backend_file_file_changed),
self);
self->o = g_open (self->path, O_RDWR|O_CREAT, 0770);
if (self->o == -1)
{
/* Try again but this time with only read access. This is
* a quick-fix for make distcheck, where img_cmp fails
* when it opens a GeglBuffer file in the source tree
* (which is read-only).
*/
self->o = g_open (self->path, O_RDONLY, 0770);
if (self->o == -1)
g_warning ("%s: Could not open '%s': %s", G_STRFUNC, self->path, g_strerror (errno));
}
self->i = dup (self->o);
self->header = gegl_buffer_read_header (self->i, &offset)->header;
self->header.rev = self->header.rev -1;
/* we are overriding all of the work of the actual constructor here,
* a really evil hack :d
*/
backend->priv->tile_width = self->header.tile_width;
backend->priv->tile_height = self->header.tile_height;
backend->priv->format = babl_format (self->header.description);
backend->priv->px_size = babl_format_get_bytes_per_pixel (backend->priv->format);
backend->priv->tile_size = backend->priv->tile_width *
backend->priv->tile_height *
backend->priv->px_size;
/* insert each of the entries into the hash table */
gegl_tile_backend_file_load_index (self, TRUE);
self->exist = TRUE;
g_assert (self->i != -1);
g_assert (self->o != -1);
/* to autoflush gegl_buffer_set */
/* XXX: poking at internals, icky */
backend->priv->shared = TRUE;
}
else
{
self->exist = FALSE; /* this is also the default, the file will be created on demand */
}
g_assert (self->file);
backend->priv->header = &self->header;
return object;
}
static void
gegl_tile_backend_file_load_index (GeglTileBackendFile *self,
gboolean block)
{
GeglBufferHeader new_header;
GList *iter;
GeglTileBackend *backend;
goffset offset = 0;
goffset max=0;
gint tile_size;
/* compute total from and next pre alloc by monitoring tiles as they
* are added here
*/
/* reload header */
new_header = gegl_buffer_read_header (self->i, &offset)->header;
self->foffset = 256;
while (new_header.flags & GEGL_FLAG_LOCKED)
{
g_usleep (50000);
new_header = gegl_buffer_read_header (self->i, &offset)->header;
self->foffset = 256;
}
if (new_header.rev == self->header.rev)
{
GEGL_NOTE(GEGL_DEBUG_TILE_BACKEND, "header not changed: %s", self->path);
return;
}
else
{
self->header=new_header;
GEGL_NOTE(GEGL_DEBUG_TILE_BACKEND, "loading index: %s", self->path);
}
tile_size = gegl_tile_backend_get_tile_size (GEGL_TILE_BACKEND (self));
offset = self->header.next;
self->tiles = gegl_buffer_read_index (self->i, &offset);
self->foffset = -1;
backend = GEGL_TILE_BACKEND (self);
for (iter = self->tiles; iter; iter=iter->next)
{
GeglBufferItem *item = iter->data;
GeglBufferItem *existing = g_hash_table_lookup (self->index, item);
if (item->tile.offset > max)
max = item->tile.offset + tile_size;
if (existing)
{
if (existing->tile.rev == item->tile.rev)
{
g_assert (existing->tile.offset == item->tile.offset);
existing->tile = item->tile;
g_free (item);
continue;
}
else
{
GeglTileStorage *storage =
(void*)gegl_tile_backend_peek_storage (backend);
GeglRectangle rect;
g_hash_table_remove (self->index, existing);
gegl_tile_source_refetch (GEGL_TILE_SOURCE (storage),
existing->tile.x,
existing->tile.y,
existing->tile.z);
if (existing->tile.z == 0)
{
rect.width = self->header.tile_width;
rect.height = self->header.tile_height;
rect.x = existing->tile.x * self->header.tile_width;
rect.y = existing->tile.y * self->header.tile_height;
}
g_free (existing);
g_signal_emit_by_name (storage, "changed", &rect, NULL);
}
}
g_hash_table_insert (self->index, iter->data, iter->data);
}
g_list_free (self->tiles);
g_slist_free (self->free_list);
self->free_list = NULL;
self->next_pre_alloc = max; /* if bigger than own? */
self->total = max;
self->tiles = NULL;
}
static GObject *
gegl_tile_backend_file_constructor (GType type,
guint n_params,
GObjectConstructParam *params)
{
GObject *object;
GeglTileBackendFile *self;
GeglTileBackend *backend;
object = G_OBJECT_CLASS (parent_class)->constructor (type, n_params, params);
self = GEGL_TILE_BACKEND_FILE (object);
backend = GEGL_TILE_BACKEND (object);
GEGL_NOTE (GEGL_DEBUG_TILE_BACKEND, "constructing file backend: %s", self->path);
#if HAVE_GIO
self->file = g_file_new_for_commandline_arg (self->path);
#else
self->i = self->o = -1;
#endif
self->index = g_hash_table_new (gegl_tile_backend_file_hashfunc, gegl_tile_backend_file_equalfunc);
/* If the file already exists open it, assuming it is a GeglBuffer. */
#if HAVE_GIO
if (g_file_query_exists (self->file, NULL))
#else
if (access (self->path, F_OK) != -1)
#endif
{
goffset offset = 0;
#if HAVE_GIO
/* Install a monitor for changes to the file in case other applications
* might be writing to the buffer
*/
self->monitor = g_file_monitor_file (self->file, G_FILE_MONITOR_NONE,
NULL, NULL);
g_signal_connect (self->monitor, "changed",
G_CALLBACK (gegl_tile_backend_file_file_changed),
self);
{
GError *error = NULL;
self->io = G_IO_STREAM (g_file_open_readwrite (self->file, NULL, &error));
if (error)
{
/* Try again but this time with only read access. This is
* a quick-fix for make distcheck, where img_cmp fails
* when it opens a GeglBuffer file in the source tree
* (which is read-only).
*/
g_error_free (error);
error = NULL;
self->i = G_INPUT_STREAM (g_file_read (self->file, NULL, &error));
if (error)
{
g_warning ("%s: %s", G_STRLOC, error->message);
g_error_free (error);
error = NULL;
}
}
else
{
self->o = g_io_stream_get_output_stream (self->io);
self->i = g_io_stream_get_input_stream (self->io);
}
}
#else
self->o = open (self->path, O_RDWR|O_CREAT, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);
self->i = dup (self->o);
#endif
/*self->i = G_INPUT_STREAM (g_file_read (self->file, NULL, NULL));*/
self->header = gegl_buffer_read_header (self->i, &offset)->header;
self->header.rev = self->header.rev -1;
/* we are overriding all of the work of the actual constructor here,
* a really evil hack :d
*/
backend->priv->tile_width = self->header.tile_width;
backend->priv->tile_height = self->header.tile_height;
backend->priv->format = babl_format (self->header.description);
backend->priv->px_size = babl_format_get_bytes_per_pixel (backend->priv->format);
backend->priv->tile_size = backend->priv->tile_width *
backend->priv->tile_height *
backend->priv->px_size;
/* insert each of the entries into the hash table */
gegl_tile_backend_file_load_index (self, TRUE);
self->exist = TRUE;
#if HAVE_GIO
/* We can only assert input stream, we won't have an output
* stream on read-only files
*/
g_assert (self->i);
#else
g_assert (self->i != -1);
g_assert (self->o != -1);
#endif
/* to autoflush gegl_buffer_set */
/* XXX: poking at internals, icky */
backend->priv->shared = TRUE;
}
else
{
self->exist = FALSE; /* this is also the default, the file will be created on demand */
}
#if HAVE_GIO
g_assert (self->file);
#endif
backend->priv->header = &self->header;
return object;
}
