1 files changed, 78 insertions, 0 deletions
diff --git a/vendor/exr/examples/3a_write_dynamic_channels_with_metadata.rs b/vendor/exr/examples/3a_write_dynamic_channels_with_metadata.rs
new file mode 100644
index 0000000..aedbb75
--- /dev/null
+++ b/vendor/exr/examples/3a_write_dynamic_channels_with_metadata.rs
@@ -0,0 +1,78 @@
+
+#[macro_use]
+extern crate smallvec;
+extern crate rand;
+extern crate half;
+
+use rand::Rng;
+
+// exr imports
+extern crate exr;
+
+
+/// Generate a noisy image and write it to a file,
+/// also attaching some meta data.
+fn main() {
+    use exr::prelude::*;
+
+    fn generate_f16_vector(size: Vec2<usize>) -> Vec<f16> {
+        let mut values = vec![ f16::from_f32(0.5); size.area() ];
+
+        for _ in 0..(1024*1024/3)/4 {
+            let index = rand::thread_rng().gen_range(0 .. values.len());
+            let value = 1.0 / rand::random::<f32>() - 1.0;
+            let value = if !value.is_normal() || value > 1000.0 { 1000.0 } else { value };
+            values[index] = f16::from_f32(value);
+        }
+
+        values
+    }
+
+    let size = (1024, 512);
+
+    let r = AnyChannel::new(
+        "R", FlatSamples::F16(generate_f16_vector(size.into()))
+    );
+
+    let g = AnyChannel::new(
+        "G", FlatSamples::F16(generate_f16_vector(size.into()))
+    );
+
+    let b = AnyChannel::new(
+        "B", FlatSamples::F32(generate_f16_vector(size.into()).into_iter().map(f16::to_f32).collect())
+    );
+
+    let a = AnyChannel::new(
+        "A", FlatSamples::F32(generate_f16_vector(size.into()).into_iter().map(f16::to_f32).collect())
+    );
+
+    let mut layer_attributes = LayerAttributes::named("test-image");
+    layer_attributes.owner = Some(Text::from("It's you!"));
+    layer_attributes.comments = Some(Text::from("This image was procedurally generated"));
+
+    let layer = Layer::new(
+        size,
+        layer_attributes,
+        Encoding::default(),
+        AnyChannels::sort(smallvec![ r, g, b, a ]),
+    );
+
+    // crop away transparent pixels from the border
+    let layer = layer
+
+        // channel order is (a,b,g,r), as channels are already sorted
+        .crop_where(|samples| samples[0].is_zero())
+
+        // throw error if the image is 100% transparent pixels and should be removed
+        .or_none_if_empty().expect("image is empty and cannot be cropped");
+
+    let image = Image::from_layer(layer);
+
+    println!("writing image {:#?}", image);
+
+    image.write()
+        .on_progress(|progress| println!("progress: {:.1}", progress*100.0))
+        .to_file("noisy.exr").unwrap();
+
+    println!("created file noisy.exr");
+}
+\ No newline at end of file