Vendor things

third-party/vendor/image/tests/conversions.rs

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+use image::buffer::ConvertBuffer;
+use image::{ImageBuffer, Rgb, Rgba};
+
+#[test]
+fn test_rgbu8_to_rgbu16() {
+    // Create an all white image using Rgb<u16>s for pixel values
+    let image_u16 =
+        ImageBuffer::from_pixel(2, 2, image::Rgb::<u16>([u16::MAX, u16::MAX, u16::MAX]));
+
+    // Create an all white image using Rgb<u8>s for pixel values and convert it
+    // to Rgb<u16>s.
+    let image_u8 = ImageBuffer::from_pixel(2, 2, image::Rgb::<u8>([u8::MAX, u8::MAX, u8::MAX]));
+    let image_converted: ImageBuffer<Rgb<u16>, _> = image_u8.convert();
+
+    assert_eq!(image_u16, image_converted);
+}
+
+#[test]
+fn test_rgbau8_to_rgbau16() {
+    let image_u16 = ImageBuffer::from_pixel(
+        2,
+        2,
+        image::Rgba::<u16>([u16::MAX, u16::MAX, u16::MAX, u16::MAX]),
+    );
+
+    let image_u8 = ImageBuffer::from_pixel(
+        2,
+        2,
+        image::Rgba::<u8>([u8::MAX, u8::MAX, u8::MAX, u8::MAX]),
+    );
+    let image_converted: ImageBuffer<Rgba<u16>, _> = image_u8.convert();
+
+    assert_eq!(image_u16, image_converted);
+}