[Phpmyadmin-devel] Base64 encoded images in HTML
Herman van Rink
rink at initfour.nl
Fri Jun 18 16:02:38 CEST 2010
On 17-06-10 19:49, Martynas Mickevic(ius wrote:
> First of all pros:
> * no additional request to fetch the image from server.
Which has as a big benefit that you don't need to store any intermediate
data in e.g. the php session. Or get it from MySQL again.
> * image generation script can return multiple values. For example
> the image itself and the image map (later used for tooltips) can
> be returned.
> * some overhead is introduced when encoding binary data into
> base64 format. On my experiment 46kB image was encoded into
> 60kB. (~30% overhead).
> * Script execution is halted while the image generation is in
> progress. This introduces slower response times for pages, which
> show charts. (If the image is loaded in a "normal" way, in many
> browsers page is started being rendered before images are
> received from the server). This problem can be solved by writing
> rendered charts to disk. However almost all planned charts are
> going to display dynamic data (query results, profiling data,
> query statistics).
> * Generated images can not be linked to externally. (hardly a
> problem for PMA)
> The only real problem that I see is the longer script execution times.
> However all the charts will be generated only on user request, so we
> can assume that the user knows that the chart is coming soon and
> expects to wait a little bit more.
> Both techniques are easy to implement. I have already images as base64
> strings working. Changing this would be a matter of minutes.
> What do you think?
Base64 images seems like an elegant solution to me. I agree that the
biggest drawback is the longer execution time. But in a scenario where
you want to have a fast loading UI and load these graphs in the
So it that case you would use a different rendering engine.
Met vriendelijke groet / Regards,
Herman van Rink
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Developers