From 65962ba03d045b627370deec21cc354b7974e273 Mon Sep 17 00:00:00 2001
From: Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
Date: Wed, 20 May 2026 23:50:38 +0200
Subject: [PATCH] LibGfx: Add IPC serialization for CornerRadii

The compositor IPC boundary needs to transfer CSS corner radii without
keeping their wire shape in Web-specific glue. Declare the IPC
specializations on the LibGfx types and encode each corner radius pair
next to the CornerRadii implementation.

This is preparatory work required to add IPC between the main and
compositor threads.
---
 Libraries/LibGfx/CornerRadii.cpp | 44 ++++++++++++++++++++++++++++++++
 Libraries/LibGfx/CornerRadii.h   | 17 ++++++++++++
 2 files changed, 61 insertions(+)

diff --git a/Libraries/LibGfx/CornerRadii.cpp b/Libraries/LibGfx/CornerRadii.cpp
index 52b7a717c3..c491bba1d5 100644
--- a/Libraries/LibGfx/CornerRadii.cpp
+++ b/Libraries/LibGfx/CornerRadii.cpp
@@ -7,6 +7,8 @@
 
 #include <AK/Math.h>
 #include <LibGfx/CornerRadii.h>
+#include <LibIPC/Decoder.h>
+#include <LibIPC/Encoder.h>
 
 namespace Gfx {
 
@@ -44,3 +46,45 @@ void CornerRadii::adjust_corners_for_spread_distance(int spread_distance)
 }
 
 }
+
+namespace IPC {
+
+template<>
+ErrorOr<void> encode(Encoder& encoder, Gfx::CornerRadius const& radius)
+{
+    TRY(encoder.encode(radius.horizontal_radius));
+    TRY(encoder.encode(radius.vertical_radius));
+    return {};
+}
+
+template<>
+ErrorOr<Gfx::CornerRadius> decode(Decoder& decoder)
+{
+    return Gfx::CornerRadius {
+        .horizontal_radius = TRY(decoder.decode<int>()),
+        .vertical_radius = TRY(decoder.decode<int>()),
+    };
+}
+
+template<>
+ErrorOr<void> encode(Encoder& encoder, Gfx::CornerRadii const& radii)
+{
+    TRY(encoder.encode(radii.top_left));
+    TRY(encoder.encode(radii.top_right));
+    TRY(encoder.encode(radii.bottom_right));
+    TRY(encoder.encode(radii.bottom_left));
+    return {};
+}
+
+template<>
+ErrorOr<Gfx::CornerRadii> decode(Decoder& decoder)
+{
+    return Gfx::CornerRadii {
+        .top_left = TRY(decoder.decode<Gfx::CornerRadius>()),
+        .top_right = TRY(decoder.decode<Gfx::CornerRadius>()),
+        .bottom_right = TRY(decoder.decode<Gfx::CornerRadius>()),
+        .bottom_left = TRY(decoder.decode<Gfx::CornerRadius>()),
+    };
+}
+
+}
diff --git a/Libraries/LibGfx/CornerRadii.h b/Libraries/LibGfx/CornerRadii.h
index 35a066e45c..a266e65605 100644
--- a/Libraries/LibGfx/CornerRadii.h
+++ b/Libraries/LibGfx/CornerRadii.h
@@ -9,6 +9,7 @@
 
 #include <LibGfx/Point.h>
 #include <LibGfx/Rect.h>
+#include <LibIPC/Forward.h>
 
 namespace Gfx {
 
@@ -90,3 +91,19 @@ struct CornerRadii {
 };
 
 }
+
+namespace IPC {
+
+template<>
+ErrorOr<void> encode(Encoder&, Gfx::CornerRadius const&);
+
+template<>
+ErrorOr<Gfx::CornerRadius> decode(Decoder&);
+
+template<>
+ErrorOr<void> encode(Encoder&, Gfx::CornerRadii const&);
+
+template<>
+ErrorOr<Gfx::CornerRadii> decode(Decoder&);
+
+}