/* Call a start function if no sequence is running on this VipsRegion.
*/
int
vips__region_start( VipsRegion *region )
{
VipsImage *image = region->im;
if( !region->seq && image->start_fn ) {
VIPS_GATE_START( "vips__region_start: wait" );
g_mutex_lock( image->sslock );
VIPS_GATE_STOP( "vips__region_start: wait" );
region->seq = image->start_fn( image,
image->client1, image->client2 );
g_mutex_unlock( image->sslock );
if( !region->seq ) {
#ifdef DEBUG
printf( "vips__region_start: "
"start function failed for image %s",
image->filename );
#endif /*DEBUG*/
return( -1 );
}
}
return( 0 );
}
/* Call a stop function if a sequence is running in this VipsRegion.
*/
void
vips__region_stop( VipsRegion *region )
{
VipsImage *image = region->im;
if( region->seq && image->stop_fn ) {
int result;
VIPS_GATE_START( "vips__region_stop: wait" );
g_mutex_lock( image->sslock );
VIPS_GATE_STOP( "vips__region_stop: wait" );
result = image->stop_fn( region->seq,
image->client1, image->client2 );
g_mutex_unlock( image->sslock );
/* stop function can return an error, but we have nothing we
* can really do with it, sadly.
*/
if( result )
vips_warn( "VipsRegion",
"stop callback failed for image %s",
image->filename );
region->seq = NULL;
}
}
/* Call a start function if no sequence is running on this VipsRegion.
*/
int
vips__region_start( VipsRegion *region )
{
VipsImage *image = region->im;
if( !region->seq && image->start_fn ) {
VIPS_GATE_START( "vips__region_start: wait" );
g_mutex_lock( image->sslock );
VIPS_GATE_STOP( "vips__region_start: wait" );
region->seq = image->start_fn( image,
image->client1, image->client2 );
g_mutex_unlock( image->sslock );
if( !region->seq ) {
vips_error( "vips__region_start",
_( "start function failed for image %s" ),
image->filename );
return( -1 );
}
}
return( 0 );
}
