Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

1 files changed, 73 insertions, 0 deletions

diff --git a/vendor/exr/examples/5d_write_legacy_layers.rs b/vendor/exr/examples/5d_write_legacy_layers.rs
new file mode 100644
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+++ b/vendor/exr/examples/5d_write_legacy_layers.rs
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+
+#[macro_use]
+extern crate smallvec;
+extern crate rand;
+extern crate half;
+
+
+// exr imports
+extern crate exr;
+
+// TODO create a dedicated reader and writer for this scenario
+
+/// Generate an image with channel groups and write it to a file.
+/// Some legacy software may group layers that contain a `.` in the layer name.
+///
+/// Note: This is an OpenEXR legacy strategy. OpenEXR supports layers natively since 2013.
+/// Use the natively supported exrs `Layer` types instead, if possible.
+///
+fn main() {
+    use exr::prelude::*;
+    // TODO simplify handling these types of layers using read() and write()
+
+    let size = Vec2(512, 512);
+
+    let create_channel = |name: &str| -> AnyChannel<FlatSamples> {
+        let color: f16 = f16::from_bits(rand::random::<u16>());
+
+        AnyChannel::new(
+            name,
+            FlatSamples::F16(vec![color; size.area() ])
+        )
+    };
+
+
+    // The channels have the following structure:
+    //
+    // - Object
+    //     - Red
+    //     - Green
+    //     - Blue
+    //     - Alpha
+
+    // - Background
+    //     - Red
+    //     - Green
+    //     - Blue
+
+    let foreground_r = create_channel("Object.R");
+    let foreground_g = create_channel("Object.G");
+    let foreground_b = create_channel("Object.B");
+    let foreground_a = create_channel("Object.A");
+
+    let background_r = create_channel("Background.R");
+    let background_g = create_channel("Background.G");
+    let background_b = create_channel("Background.B");
+
+    let layer = Layer::new(
+        size,
+        LayerAttributes::named("test-image"),
+        Encoding::FAST_LOSSLESS,
+        AnyChannels::sort(smallvec![ // the order does not actually matter
+            foreground_r, foreground_g, foreground_b, foreground_a,
+            background_r, background_g, background_b
+        ]),
+    );
+
+    let image = Image::from_layer(layer);
+
+    println!("writing image {:#?}", image);
+    image.write().to_file("groups.exr").unwrap();
+
+    println!("created file groups.exr");
+}
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