64 lines
2.1 KiB
Rust
64 lines
2.1 KiB
Rust
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// exr imports
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extern crate exr;
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/// Write an rgba exr file, generating the pixel values on the fly.
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/// This streams the generated pixel directly to the file,
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/// never allocating the actual total pixel memory of the image.
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fn main() {
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use exr::prelude::*;
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use exr::meta::attribute::*;
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// this function can generate a color for any pixel
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let generate_pixels = |position: Vec2<usize>| (
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position.x() as f32 / 2048.0, // red
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position.y() as f32 / 2048.0, // green
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1.0 - (position.y() as f32 / 2048.0), // blue
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1.0 // alpha
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);
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let mut layer_attributes = LayerAttributes::named("generated rgba main layer");
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layer_attributes.comments = Some(Text::from("This image was generated as part of an example"));
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layer_attributes.owner = Some(Text::from("The holy lambda function"));
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layer_attributes.software_name = Some(Text::from("EXRS Project"));
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layer_attributes.exposure = Some(1.0);
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layer_attributes.focus = Some(12.4);
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layer_attributes.frames_per_second = Some((60, 1));
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layer_attributes.other.insert(
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Text::from("Layer Purpose (Custom Layer Attribute)"),
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AttributeValue::Text(Text::from("This layer contains the rgb pixel data"))
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);
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let layer = Layer::new(
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(2*2048, 2*2048),
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layer_attributes,
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Encoding::SMALL_FAST_LOSSLESS, // use fast but lossy compression
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SpecificChannels::rgba(generate_pixels)
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);
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// crop away black and transparent pixels from the border, if any
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let layer = layer
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.crop_where_eq((0.0, 0.0, 0.0, 0.0))
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.or_crop_to_1x1_if_empty();
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let mut image = Image::from_layer(layer);
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image.attributes.pixel_aspect = 1.0;
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image.attributes.time_code = Some(TimeCode {
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hours: 0,
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minutes: 1,
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seconds: 59,
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frame: 29,
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..TimeCode::default()
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});
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image.attributes.other.insert(
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Text::from("Mice Count (Custom Image Attribute)"),
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AttributeValue::I32(23333)
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);
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// write it to a file with all cores in parallel
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image.write().to_file("generated_rgba_with_meta.exr").unwrap();
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println!("created file generated_rgba_with_meta.exr");
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}
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