layer modes: add overlay blend mode
authorAndrew Chadwick <andrewc-git@piffle.org>
Sun, 28 Oct 2012 01:11:23 +0000 (01:11 +0000)
committerAndrew Chadwick <andrewc-git@piffle.org>
Mon, 29 Oct 2012 03:22:02 +0000 (03:22 +0000)
commitb7273e01e3843004b5557880ef8249518a3b6bad
tree105148180f72bb189529b4fa0e2cd7c4e295318b
parent8f4453d3cdd406bf509156b1b632376e40dc641c
layer modes: add overlay blend mode

Add the svg:overlay operator, specified as being the W3C SVG one by the
OpenRaster specification.

http://www.w3.org/TR/SVGCompositing/#comp-op-overlay
http://gna.org/bugs/?20157
lib/composite_rgbx.hpp
lib/layer.py
lib/pixops.hpp
lib/tiledsurface.py