Re: SVG to PNG

On Mon, 9 Nov 2020, Pro Turm wrote:

> Thanks for answering.
>
>>  improving support for SVG 1.1 and adding a few missing features such as
> support for radial gradients
> Is there any reference of which are the implemented vs. the missing
> features? How about SVG 1.2 ?

I am not aware of a list of missing features.  I expect that there is 
some support for SVG 1.1.

SVG has become very complicated and new options are added to existing 
reqests.  This means that a simple request which is also compliant 
with SVG 1.2 may work, but adding just one option to the request might 
obtain unexpected behavior.

>> The GraphicsMagick delegates subsystem can support using an external SVG
> renderer if the user desires that.
> Could you provide some examples or documentation about it?

It would be done via the existing delegates.mgk file which is a text 
format which allows adding new entries.  There is some documentation 
at the top of the installed delegates.mgk file, and lots of examples 
in the file.

Ultimately, you need to look at your SVG use-cases.  If you plan to 
support arbitrary SVG from the "Web", then GraphicsMagick is likely 
not the best solution.  If the SVG is well managed or locally 
produced, then GraphicsMagick might be a good solution.

SVG is dangerous from a security perspective since a SVG file can 
request to download files from URLs.  Unless the SVG renderer has some 
way to evaluate if a request should be honored (as a SVG 
implementation in a Web browser should do), the SVG files might 
perform requests on hosts on your secure internal network.  A web 
browser might know that the URLs are from the same site where the SVG 
came from, or it may make special allowances for downloading fonts 
from Google.

Bob
-- 
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
Public Key,     http://www.simplesystems.org/users/bfriesen/public-key.txt