From 032646b6c3bac74944884337cfbe7cad382baef1 Mon Sep 17 00:00:00 2001
From: Sam Atkins <atkinssj@serenityos.org>
Date: Thu, 21 Jul 2022 14:29:47 +0100
Subject: [PATCH] LibWeb: Produce a transformation matrix for
 TransformFunction::Rotate

Currently we can't actually paint the result, but at least the maths is
correct. :^)
---
 Userland/Libraries/LibWeb/Painting/StackingContext.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Userland/Libraries/LibWeb/Painting/StackingContext.cpp b/Userland/Libraries/LibWeb/Painting/StackingContext.cpp
index 9fd827a260..c205b6a23a 100644
--- a/Userland/Libraries/LibWeb/Painting/StackingContext.cpp
+++ b/Userland/Libraries/LibWeb/Painting/StackingContext.cpp
@@ -247,6 +247,10 @@ Gfx::FloatMatrix4x4 StackingContext::get_transformation_matrix(CSS::Transformati
                 0, 0, 1, 0,
                 0, 0, 0, 1);
         break;
+    case CSS::TransformFunction::Rotate:
+        if (count == 1)
+            return Gfx::rotation_matrix({ 0.0f, 0.0f, 1.0f }, value(0));
+        break;
     default:
         dbgln_if(LIBWEB_CSS_DEBUG, "FIXME: Unhandled transformation function {}", CSS::TransformationStyleValue::create(transformation.function, {})->to_string());
     }