1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
// exr imports
extern crate exr;
/// Write an rgba exr file, generating the pixel values on the fly.
/// This streams the generated pixel directly to the file,
/// never allocating the actual total pixel memory of the image.
fn main() {
use exr::prelude::*;
use exr::meta::attribute::*;
// this function can generate a color for any pixel
let generate_pixels = |position: Vec2<usize>| (
position.x() as f32 / 2048.0, // red
position.y() as f32 / 2048.0, // green
1.0 - (position.y() as f32 / 2048.0), // blue
1.0 // alpha
);
let mut layer_attributes = LayerAttributes::named("generated rgba main layer");
layer_attributes.comments = Some(Text::from("This image was generated as part of an example"));
layer_attributes.owner = Some(Text::from("The holy lambda function"));
layer_attributes.software_name = Some(Text::from("EXRS Project"));
layer_attributes.exposure = Some(1.0);
layer_attributes.focus = Some(12.4);
layer_attributes.frames_per_second = Some((60, 1));
layer_attributes.other.insert(
Text::from("Layer Purpose (Custom Layer Attribute)"),
AttributeValue::Text(Text::from("This layer contains the rgb pixel data"))
);
let layer = Layer::new(
(2*2048, 2*2048),
layer_attributes,
Encoding::SMALL_FAST_LOSSLESS, // use fast but lossy compression
SpecificChannels::rgba(generate_pixels)
);
// crop away black and transparent pixels from the border, if any
let layer = layer
.crop_where_eq((0.0, 0.0, 0.0, 0.0))
.or_crop_to_1x1_if_empty();
let mut image = Image::from_layer(layer);
image.attributes.pixel_aspect = 1.0;
image.attributes.time_code = Some(TimeCode {
hours: 0,
minutes: 1,
seconds: 59,
frame: 29,
..TimeCode::default()
});
image.attributes.other.insert(
Text::from("Mice Count (Custom Image Attribute)"),
AttributeValue::I32(23333)
);
// write it to a file with all cores in parallel
image.write().to_file("generated_rgba_with_meta.exr").unwrap();
println!("created file generated_rgba_with_meta.exr");
}
|
