Initial vendor packages

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

1 files changed, 30 insertions, 0 deletions

diff --git a/vendor/exr/examples/0c_read_rgba.rs b/vendor/exr/examples/0c_read_rgba.rs
new file mode 100644
index 0000000..a2126f8
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+++ b/vendor/exr/examples/0c_read_rgba.rs
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+extern crate exr;
+
+/// `exr` offers a few simplified functions for the most basic use cases.
+/// `read_first_rgba_layer_from_file` is a such a function, which loads rgba exr files.
+/// To load the pixel data, you need to specify
+/// how to create and how to set the pixels of your image.
+fn main() {
+    let image = exr::prelude::read_first_rgba_layer_from_file(
+        "generated_rgba.exr",
+
+        // instantiate your image type with the size of the image in file
+        |resolution, _| {
+            let default_pixel = [0.0, 0.0, 0.0, 0.0];
+            let empty_line =  vec![ default_pixel; resolution.width() ];
+            let empty_image =  vec![ empty_line; resolution.height() ];
+            empty_image
+        },
+
+        // transfer the colors from the file to your image type,
+        // requesting all values to be converted to f32 numbers (you can also directly use f16 instead)
+        // and you could also use `Sample` instead of `f32` to keep the original data type from the file
+        |pixel_vector, position, (r,g,b, a): (f32, f32, f32, f32)| {
+            pixel_vector[position.y()][position.x()] = [r, g, b, a]
+        },
+
+    ).expect("run the `1_write_rgba` example to generate the required file");
+
+    // printing all pixels might kill the console, so only print some meta data about the image
+    println!("opened file generated_rgba.exr: {:#?}", image.layer_data.attributes);
+}
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