[BATIK-1153] PNGTranscoder creates (visually) different PNGs on Mac or Windows for same SVG

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.7, 1.8
• Component/s: SVG Rasterizer
• Assignee: Unassigned
• Reporter: Matthias Becker
• Created: 16/Jun/16 11:52
• Updated: 16/Jun/16 13:03

Description

We use the PNGTranscoder to rasterize SVGs into PNG.
We get visually different results when we rasterize the same identical SVG on Windows and on Mac.

While debugging around I found out that ConcreteImageRendererFactory#createStaticImageRenderer creates different Implementation on Mac / Windows. This was implemented because of https://issues.apache.org/jira/browse/BATIK-593?jql=project%20%3D%20BATIK%20AND%20text%20~%20Mac .
I now did create StaticRenderer and MacRenderer on Mac and Windows machines (by directly calling the constructor).
These are the results:

• StaticRender and MacRenderer created visually different PNGs when executed on Mac
• StaticRenderer and MacRenderer produces visually the same PNGs when executed on Windows
• StaticRenderer executed on Mac produces visually the same PNG as executed on Windows

So only the StaticRenderer creates the same results on both platforms. I have attached the SVG and the 4 versions of the rendered PNG.

So my questions:

1. Does this performance issue mentioned in https://issues.apache.org/jira/browse/BATIK-593?jql=project%20%3D%20BATIK%20AND%20text%20~%20Mac still exist?
2. Why does the MacRenderer produce the same result as the StaticRenderer on Windows but not on Mac?