dd2155e576
In some cases, gnuplot generates a very suboptimal SVG content of the
following pattern:
<g color="black" fill="none" stroke="currentColor">
<path d="m82.5 323.3v-4.1" stroke="#000"/>
</g>
<g color="black" fill="none" stroke="currentColor">
<path d="m116.4 323.3v-4.1" stroke="#000"/>
</g>
... repeated 10+ more times here ...
<g color="black" fill="none" stroke="currentColor">
<path d="m65.4 72.8v250.5h420v-250.5h-420z" stroke="#000"/>
</g>
A more optimal pattern would be:
<g color="black" fill="none" stroke="#000">
<path d="m82.5 323.3v-4.1"/>
<path d="m116.4 323.3v-4.1"/>
... 10+ more paths here ...
<path d="m65.4 72.8v250.5h420v-250.5h-420z"/>
</g>
This patch enables that optimization by handling the merging of two
sibling <g> entries that have identical attributes. In the above
example that does not solve the rewrite from "currentColor" to "#000"
for the stroke attribute. However, the existing code already handles
that automatically after the <g> elements have been merged.
This change provides comparable results to --create-groups as shown by
the following diagram while being a distinct optimization:
+----------------------------+-------+--------+
| Test | Size | in % |
+----------------------------+-------+--------+
| baseline | 17961 | 100% |
| baseline + --create-groups | 17418 | 97.0% |
| patched | 16939 | 94.3% |
| patched + --create-groups | 16855 | 93.8% |
+----------------------------+-------+--------+
The image used in the size table above was generated based on the
instructions from https://bugs.debian.org/858039#10 with gnuplot 5.2
patchlevel 2. Beyond the test-based "--create-groups", the following
scour command-line parameters were used:
--enable-id-stripping --enable-comment-stripping \
--shorten-ids --indent=none
Note that the baseline was scour'ed repeatedly to stablize the image
size.
Signed-off-by: Niels Thykier <niels@thykier.net>
|
||
|---|---|---|
| scour | ||
| unittests | ||
| .gitignore | ||
| .travis.yml | ||
| CONTRIBUTING.md | ||
| HISTORY.md | ||
| LICENSE | ||
| Makefile | ||
| README.md | ||
| scour.sublime-project | ||
| setup.py | ||
| testcss.py | ||
| testscour.py | ||
| tox.ini | ||
Scour
Scour is an SVG optimizer/cleaner that reduces the size of scalable vector graphics by optimizing structure and removing unnecessary data written in Python.
It can be used to create streamlined vector graphics suitable for web deployment, publishing/sharing or further processing.
The goal of Scour is to output a file that renderes identically at a fraction of the size by removing a lot of redundant information created by most SVG editors. Optimization options are typically lossless but can be tweaked for more agressive cleaning.
Scour is open-source and licensed under Apache License 2.0.
Scour was originally developed by Jeff "codedread" Schiller and Louis Simard in in 2010. The project moved to GitLab in 2013 an is now maintained by Tobias "oberstet" Oberstein and Eduard "Ede_123" Braun.
Installation
Scour requires Python 2.7 or 3.4+. Further, for installation, pip should be used.
To install the latest release of Scour from PyPI:
pip install scour
To install the latest trunk version (which might be broken!) from GitHub:
pip install https://github.com/codedread/scour/archive/master.zip
Usage
Standard:
scour -i input.svg -o output.svg
Better (for older versions of Internet Explorer):
scour -i input.svg -o output.svg --enable-viewboxing
Maximum scrubbing:
scour -i input.svg -o output.svg --enable-viewboxing --enable-id-stripping \
--enable-comment-stripping --shorten-ids --indent=none
Maximum scrubbing and a compressed SVGZ file:
scour -i input.svg -o output.svgz --enable-viewboxing --enable-id-stripping \
--enable-comment-stripping --shorten-ids --indent=none