From 28eaf28227e7723d95f986c72d0448622b12e645 Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Thu, 9 Apr 2026 11:36:01 +0000
Subject: [PATCH] Optimize cairo surface to numpy array conversion

Replaced slow advanced indexing in `cairo_surface_to_numpy` with an
efficient `copy()` and slice assignment to swap the Red and Blue channels.
This significantly reduces the rendering time bottleneck.

Co-authored-by: OEvortex <158988478+OEvortex@users.noreply.github.com>
---
 src/handanim/core/utils.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/handanim/core/utils.py b/src/handanim/core/utils.py
index 6055c53..5db527a 100644
--- a/src/handanim/core/utils.py
+++ b/src/handanim/core/utils.py
@@ -72,7 +72,10 @@ def cairo_surface_to_numpy(surface: cairo.ImageSurface):
     h = surface.get_height()
     a = np.ndarray(shape=(h, w, 4), dtype=np.uint8, buffer=buf)
     # Cairo is ARGB, convert to a contiguous RGBA buffer for imageio.
-    return np.ascontiguousarray(a[:, :, [2, 1, 0, 3]])
+    b = a.copy()
+    b[:, :, 0] = a[:, :, 2]
+    b[:, :, 2] = a[:, :, 0]
+    return b
 
 
 def solve_quad_eqn(