artemp/trac2github — Issue #75: Allow loading prerendered images for blending etc
Author: artemp
Created: 2011-10-09 20:12:05+00:00
State: open
Labels: Boost_Python_Binding

Mapnik bindings currently do not allow you to load an image from a file.

Being able to do this is useful if you have a prerendered image which needs blending with the mapnik output. (ie: in my example, we are rendering contours, of which there are a large number, but they never change, so rather than render them every time we want to render them once and then re-use the transparent PNGs produced)

A patch to allow this is attached.