/* Return a ref to a buffer that encloses area. The buffer we return might be
* done.
*/
VipsBuffer *
vips_buffer_ref( VipsImage *im, VipsRect *area )
{
VipsBuffer *buffer;
if( (buffer = buffer_find( im, area )) )
return( buffer );
else
return( vips_buffer_new( im, area ) );
}
/* Return a ref to a buffer that encloses area.
*/
VipsBuffer *
vips_buffer_ref( VipsImage *im, VipsRect *area )
{
VipsBuffer *buffer;
if( !(buffer = buffer_find( im, area )) )
/* No existing buffer ... make a new one.
*/
if( !(buffer = vips_buffer_new( im, area )) )
return( NULL );
return( buffer );
}
/* Unref old, ref new, in a single operation. Reuse stuff if we can. The
* buffer we return might or might not be done.
*/
VipsBuffer *
vips_buffer_unref_ref( VipsBuffer *old_buffer, VipsImage *im, VipsRect *area )
{
VipsBuffer *buffer;
g_assert( !old_buffer ||
old_buffer->im == im );
/* Is the current buffer OK?
*/
if( old_buffer &&
vips_rect_includesrect( &old_buffer->area, area ) )
return( old_buffer );
/* Does the new area already have a buffer?
*/
if( (buffer = buffer_find( im, area )) ) {
VIPS_FREEF( vips_buffer_unref, old_buffer );
return( buffer );
}
/* Is the current buffer unshared? We can just move it.
*/
if( old_buffer &&
old_buffer->ref_count == 1 ) {
if( buffer_move( old_buffer, area ) ) {
vips_buffer_unref( old_buffer );
return( NULL );
}
return( old_buffer );
}
/* Fallback ... unref the old one, make a new one.
*/
VIPS_FREEF( vips_buffer_unref, old_buffer );
if( !(buffer = vips_buffer_new( im, area )) )
return( NULL );
return( buffer );
}
