1 files changed, 35 insertions, 0 deletions
diff --git a/layout/style/GenerateCompositorAnimatableProperties.py b/layout/style/GenerateCompositorAnimatableProperties.py
new file mode 100644
index 0000000000..b64183b679
--- /dev/null
+++ b/layout/style/GenerateCompositorAnimatableProperties.py
@@ -0,0 +1,35 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import runpy
+
+
+def generate(output, dataFile):
+    output.write(
+        """/* THIS IS AN AUTOGENERATED FILE.  DO NOT EDIT */
+#ifndef COMPOSITOR_ANIMATABLE_PROPERTY_LIST
+#define COMPOSITOR_ANIMATABLE_PROPERTY_LIST { \\
+"""
+    )
+
+    def can_animate_on_compositor(p):
+        return "CanAnimateOnCompositor" in p.flags and p.type() != "alias"
+
+    properties = runpy.run_path(dataFile)["data"]
+    properties = filter(can_animate_on_compositor, properties.values())
+
+    count = 0
+    for p in properties:
+        output.write("  eCSSProperty_{}, \\\n".format(p.id))
+        count += 1
+
+    output.write("}\n")
+    output.write("#endif /* COMPOSITOR_ANIMATABLE_PROPERTY_LIST */\n")
+
+    output.write("\n")
+    output.write("#ifndef COMPOSITOR_ANIMATABLE_PROPERTY_LIST_LENGTH\n")
+    output.write(
+        "#define COMPOSITOR_ANIMATABLE_PROPERTY_LIST_LENGTH {}\n".format(count)
+    )
+    output.write("#endif /* COMPOSITOR_ANIMATABLE_PROPERTY_LIST_LENGTH */\n")