Dark mode: invert some images

pep-0001.txt

@@ -438,6 +438,7 @@ an API can replace version 1.
 
 The possible paths of the status of PEPs are as follows:
 
+.. rst-class:: invert-in-dark-mode
 .. image:: pep-0001-process_flow.png
    :alt: PEP process flow diagram
 

pep-0458.txt

@@ -488,6 +488,7 @@ also indicates the types of keys used to sign each role, and which roles are
 trusted to sign for files available on PyPI.  The next two sections cover the
 details of signing repository files and the types of keys used for each role.
 
+.. rst-class:: invert-in-dark-mode
 .. image:: pep-0458-1.png
 
 Figure 1: An overview of the role metadata available on PyPI.

pep-0480.txt

@@ -206,6 +206,7 @@ projects are signed by an online key.  That is, an attacker is able to corrupt
 packages in the minimum security model, but not in the maximum model, without
 also compromising a developer's key.
 
+.. rst-class:: invert-in-dark-mode
 .. image:: pep-0480-1.png
 
 Figure 1: An overview of the metadata layout in the maximum security model.

pep-0495.txt

@@ -384,6 +384,7 @@ smaller after any transition that creates a fold.  The values returned
 by ``tzname()`` and ``dst()`` may or may not depend on the value of
 the ``fold`` attribute depending on the kind of the transition.
 
+.. rst-class:: invert-in-dark-mode
 .. image:: pep-0495-fold-2.png
   :align: center
   :width: 60%
@@ -409,6 +410,7 @@ local time that falls in a gap, the rules in effect before the
 transition should be used if ``fold=0``.  Otherwise, the rules in
 effect after the transition should be used.
 
+.. rst-class:: invert-in-dark-mode
 .. image:: pep-0495-gap.png
   :align: center
   :width: 60%

pep-0525.txt

@@ -386,6 +386,7 @@ reference implementation introduces three new objects:
 methods).  Essentially, they control how asynchronous generators are
 iterated:
 
+.. rst-class:: invert-in-dark-mode
 .. image:: pep-0525-1.png
    :align: center
    :width: 80%

pep-0532.txt

@@ -680,6 +680,7 @@ The following diagram illustrates the core concepts behind the circuit
 breaking protocol (although it glosses over the technical detail of looking
 up the special methods via the type rather than the instance):
 
+.. rst-class:: invert-in-dark-mode
 .. image:: pep-0532/circuit-breaking-protocol.svg
    :alt: diagram of circuit breaking protocol applied to ternary expression
 

pep-0550.rst

@@ -1565,6 +1565,7 @@ coroutine.
 Appendix: HAMT Performance Analysis
 ===================================
 
+.. rst-class:: invert-in-dark-mode
 .. figure:: pep-0550-hamt_vs_dict-v2.png
    :align: center
    :width: 100%
@@ -1578,6 +1579,7 @@ The above chart demonstrates that:
 
 * ``dict.copy()`` becomes very slow around 100 items.
 
+.. rst-class:: invert-in-dark-mode
 .. figure:: pep-0550-lookup_hamt.png
    :align: center
    :width: 100%

pep-0603.rst

@@ -295,6 +295,7 @@ fairly detailed description of the algorithm as well.
 Performance
 -----------
 
+.. rst-class:: invert-in-dark-mode
 .. figure:: pep-0603-hamt_vs_dict.png
    :align: center
    :width: 100%
@@ -309,6 +310,7 @@ The above chart demonstrates that:
 * ``dict.copy()`` becomes less efficient when using around
   100-200 items.
 
+.. rst-class:: invert-in-dark-mode
 .. figure:: pep-0603-lookup_hamt.png
    :align: center
    :width: 100%

pep-3147.txt

@@ -316,6 +316,7 @@ Flow chart
 
 Here is a flow chart describing how modules are loaded:
 
+.. rst-class:: invert-in-dark-mode
 .. image:: pep-3147-1.png
    :scale: 75
 

pep_sphinx_extensions/pep_theme/static/dark.css

@@ -16,3 +16,7 @@
     --colour-inline-code: #333;
     --colour-warning: #900;
 }
+
+.invert-in-dark-mode {
+    filter: invert(1);
+}