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[Mahara Bot <1416890@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://reviews.mahara.org/4449
Committed: http://gitorious.org/mahara/mahara/commit/cf4f8bd63e603542f43e79816270c038594fd0cd
Submitter: Son Nguyen (son.nguyen@xxxxxxxxxxxxxxx)
Branch:    master

commit cf4f8bd63e603542f43e79816270c038594fd0cd
Author: Gilles-Philippe Leblanc <gilles-philippe.leblanc@xxxxxxxxxxxx>
Date:   Tue Mar 17 13:09:22 2015 -0400

Use SVG images and provide backward compatibility (Bug #1416890)

Change-Id: I724a844fc9e4fbae9e58834082279b4f3f21995c

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https://bugs.launchpad.net/bugs/1416890

Title:
  Use SVG images and provide backward compatibility

Status in Mahara ePortfolio:
  In Progress

Bug description:
  Suggestion by Gilles-Philippe Leblanc:

  In the Moodle software, the images are all managed by a cascade system.
  The function initially looking if a svg file exists, then a png, then gif, jpg and ico.

  This lets you use a svg file and maintain backward compatibility.

  The system also detects if the browser supports SVG. Generally, all
  browsers support this format except Internet Explorer 8 and below.

  Everything is cached to avoid unnecessary calculation.

  So I was wondering if it was planned to add the following components to do this:
  * A library for browser detection on the server side
  * A function to find the right file extension
  * A library for caching php

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