From dd1052108ee5775d5730e346e88f933869a62463 Mon Sep 17 00:00:00 2001
From: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
Date: Mon, 7 Jul 2025 13:58:22 +0200
Subject: [PATCH] Add snapshot test for image blending (#7309)

This adds a test that can be used to see the improvements made by this
PR (if any):
* https://github.com/emilk/egui/pull/5839
---
 crates/egui_demo_lib/data/ring.png            | Bin 0 -> 507 bytes
 crates/egui_demo_lib/tests/image_blending.rs  |  25 ++++++++++++++++++
 .../snapshots/image_blending/image_x1.png     |   3 +++
 .../snapshots/image_blending/image_x2.png     |   3 +++
 4 files changed, 31 insertions(+)
 create mode 100644 crates/egui_demo_lib/data/ring.png
 create mode 100644 crates/egui_demo_lib/tests/image_blending.rs
 create mode 100644 crates/egui_demo_lib/tests/snapshots/image_blending/image_x1.png
 create mode 100644 crates/egui_demo_lib/tests/snapshots/image_blending/image_x2.png

diff --git a/crates/egui_demo_lib/data/ring.png b/crates/egui_demo_lib/data/ring.png
new file mode 100644
index 0000000000000000000000000000000000000000..f82db91963b9888718c91603837ea40377b3f6d4
GIT binary patch
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xF=AgFjTpu(L@uSzS_u1ROnWfU)i%Ma;t$Q!*^gw-<u?ET002ovPDHLkV1iyl-pK#}

literal 0
HcmV?d00001

diff --git a/crates/egui_demo_lib/tests/image_blending.rs b/crates/egui_demo_lib/tests/image_blending.rs
new file mode 100644
index 00000000..c8e5775a
--- /dev/null
+++ b/crates/egui_demo_lib/tests/image_blending.rs
@@ -0,0 +1,25 @@
+use egui::{hex_color, include_image};
+use egui_kittest::Harness;
+
+#[test]
+fn test_image_blending() {
+    for pixels_per_point in [1.0, 2.0] {
+        let mut harness = Harness::builder()
+            .with_pixels_per_point(pixels_per_point)
+            .build_ui(|ui| {
+                egui_extras::install_image_loaders(ui.ctx());
+                egui::Frame::new()
+                    .fill(hex_color!("#5981FF"))
+                    .show(ui, |ui| {
+                        ui.add(
+                            egui::Image::new(include_image!("../data/ring.png"))
+                                .max_height(18.0)
+                                .tint(egui::Color32::GRAY),
+                        );
+                    });
+            });
+        harness.run();
+        harness.fit_contents();
+        harness.snapshot(format!("image_blending/image_x{pixels_per_point}"));
+    }
+}
diff --git a/crates/egui_demo_lib/tests/snapshots/image_blending/image_x1.png b/crates/egui_demo_lib/tests/snapshots/image_blending/image_x1.png
new file mode 100644
index 00000000..e53ea735
--- /dev/null
+++ b/crates/egui_demo_lib/tests/snapshots/image_blending/image_x1.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:ae04cea447427982f1d68bb2250563aaa3be137a77f6dd3f253da77c194c84cf
+size 812
diff --git a/crates/egui_demo_lib/tests/snapshots/image_blending/image_x2.png b/crates/egui_demo_lib/tests/snapshots/image_blending/image_x2.png
new file mode 100644
index 00000000..25ce3ca2
--- /dev/null
+++ b/crates/egui_demo_lib/tests/snapshots/image_blending/image_x2.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:ff053e309e6ae38a4b6fe1dd58f1255116fffab6182ce5f77b6360b00cf2af47
+size 2067