From 88ef1bff389ef483222a92587cc610900ac6e1de Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Mon, 11 Apr 2022 02:29:37 +0200
Subject: [PATCH] LibWeb: Add fast path for CRC2D.drawImage() with simple
 transform

If the transform is a simple translation, we don't need to run the big
and slow transform rasterizer.
---
 Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp b/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp
index 5ce9555a7f..80972ee7cf 100644
--- a/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp
+++ b/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp
@@ -182,9 +182,10 @@ DOM::ExceptionOr<void> CanvasRenderingContext2D::draw_image(CanvasImageSource co
     if (!painter)
         return {};
 
-    if (m_drawing_state.transform.is_identity()) {
-        // There's no affine transformation to worry about, we can just call Gfx::Painter.
+    if (m_drawing_state.transform.is_identity_or_translation()) {
+        painter->translate(m_drawing_state.transform.e(), m_drawing_state.transform.f());
         painter->draw_scaled_bitmap(destination_rect.to_rounded<int>(), *bitmap, source_rect, 1.0f, Gfx::Painter::ScalingMode::BilinearBlend);
+        painter->translate(-m_drawing_state.transform.e(), -m_drawing_state.transform.f());
     } else {
         // The context has an affine transform, we have to draw through it!