/* Make a new buffer.
*/
VipsBuffer *
vips_buffer_new( VipsImage *im, VipsRect *area )
{
VipsBuffer *buffer;
buffer = g_new( VipsBuffer, 1 );
buffer->ref_count = 1;
buffer->im = im;
buffer->area = *area;
buffer->done = FALSE;
buffer->cache = NULL;
buffer->bsize = (size_t) VIPS_IMAGE_SIZEOF_PEL( im ) *
area->width * area->height;
if( !(buffer->buf = vips_tracked_malloc( buffer->bsize )) ) {
vips_buffer_unref( buffer );
return( NULL );
}
#ifdef DEBUG
printf( "** vips_buffer_new: left = %d, top = %d, "
"width = %d, height = %d (%p)\n",
buffer->area.left, buffer->area.top,
buffer->area.width, buffer->area.height,
buffer );
#endif /*DEBUG*/
#ifdef DEBUG
g_mutex_lock( vips__global_lock );
vips__buffers_all = g_slist_prepend( vips__buffers_all, buffer );
printf( "%d buffers in vips\n", g_slist_length( vips__buffers_all ) );
g_mutex_unlock( vips__global_lock );
#endif /*DEBUG*/
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 );
}