1 files changed, 44 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/canvas/element/manual/wide-gamut-canvas/canvas-display-p3-pattern-canvas.html b/testing/web-platform/tests/html/canvas/element/manual/wide-gamut-canvas/canvas-display-p3-pattern-canvas.html
new file mode 100644
index 0000000000..2b9fb9b8f4
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/manual/wide-gamut-canvas/canvas-display-p3-pattern-canvas.html
@@ -0,0 +1,44 @@
+<!DOCTYPE HTML>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="canvas-display-p3.js"></script>
+<script>
+// Test that patterns created from canvas sources with different color spaces
+// can be drawn into sRGB and Display P3 canvases, by reading pixels with
+// getImageData() as sRGB and Display P3 values.
+function runTest(sourceColorSpace, destinationColorSpace, colors) {
+    for (let [sourceColorString, expectedColor] of Object.entries(colors)) {
+        test(function() {
+            let source = document.createElement("canvas");
+            source.width = 2;
+            source.height = 2;
+
+            let sourceContext = source.getContext("2d", { colorSpace: sourceColorSpace });
+
+            let sourceColor = sourceColorString.split(",").map(x => +x);
+
+            let sourceImageData = new ImageData(2, 2, { colorSpace: sourceColorSpace });
+            for (let i = 0; i < 2 * 2 * 4; i += 4) {
+                for (let c = 0; c < 4; ++c)
+                    sourceImageData.data[i + c] = sourceColor[c];
+            }
+            sourceContext.putImageData(sourceImageData, 0, 0);
+
+            let destination = document.createElement("canvas");
+            destination.width = 4;
+            destination.height = 4;
+
+            let destinationContext = destination.getContext("2d", { colorSpace: destinationColorSpace });
+            destinationContext.fillStyle = destinationContext.createPattern(source, "repeat");
+            destinationContext.fillRect(0, 0, 4, 4);
+
+            let destinationImageData = destinationContext.getImageData(2, 2, 1, 1);
+
+            assert_true(pixelsApproximatelyEqual(destinationImageData.data, expectedColor), `Actual pixel value ${[...destinationImageData.data]} is approximately equal to ${expectedColor}.`);
+        }, `Source ${sourceColorSpace}, destination ${destinationColorSpace}, color ${sourceColorString}`);
+    }
+}
+
+runTest("srgb", "display-p3", fromSRGBToDisplayP3);
+runTest("display-p3", "srgb", fromDisplayP3ToSRGB);
+</script>