/* 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 ); }