Add Symbolator for generating symbols of verilog models

Signed-off-by: Robert Winkler <rwinkler@antmicro.com>

environment.yml

@@ -6,6 +6,9 @@ channels:
 dependencies:
   - doxygen
   - cmake
+  - pygobject
+  - cairo
+  - pango
   - pip
   - pip:
     - -r file:requirements.txt

requirements.txt

@@ -2,3 +2,4 @@ Sphinx==2.0.0
 git+http://github.com/SymbiFlow/sphinx_materialdesign_theme.git@master#egg=sphinx_symbiflow_theme
 sphinx-markdown-tables
 breathe==4.13.1
+symbolator==1.0.2

source/conf.py

@@ -25,7 +25,8 @@ needs_sphinx = '1.6'
 extensions = [
     'sphinx.ext.todo',
     'sphinx.ext.imgmath',  # breathe
-    'breathe'
+    'breathe',
+    'symbolator_sphinx',
 ]
 
 numfig = True
@@ -318,4 +319,8 @@ breathe_projects = {
     "prjxray" : "../build/doxygen/prjxray/xml",
 }
 
+### SYMBOLATOR ###
+
+symbolator_cmd_args       = ['--transparent']
+symbolator_output_format  = 'svg'