Initial vendor packages

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

vendor/exr/src/image/pixel_vec.rs

@@ -0,0 +1,97 @@
+
+//! Provides a predefined pixel storage.
+//! Currently only contains a simple flattened vector storage.
+//! Use the functions `create_pixel_vec::<YourPixelTuple>` and
+//! `set_pixel_in_vec::<YourPixelTuple>` for reading a predefined pixel vector.
+//! Use the function `PixelVec::new` to create a pixel vector which can be written to a file.
+
+use super::*;
+
+/// Store all samples in a single array.
+/// All samples will be converted to the type `T`.
+/// This supports all the sample types, `f16`, `f32`, and `u32`.
+///
+/// The flattened vector contains all rows one after another.
+/// In each row, for each pixel, its red, green, blue, and then alpha
+/// samples are stored one after another.
+///
+/// Use `PixelVec.compute_pixel_index(position)`
+/// to compute the flat index of a specific pixel.
+#[derive(Eq, PartialEq, Clone)]
+pub struct PixelVec<T> {
+
+    /// The resolution of this layer.
+    pub resolution: Vec2<usize>,
+
+    /// The flattened vector contains all rows one after another.
+    /// In each row, for each pixel, its red, green, blue, and then alpha
+    /// samples are stored one after another.
+    ///
+    /// Use `Flattened::compute_pixel_index(image, position)`
+    /// to compute the flat index of a specific pixel.
+    pub pixels: Vec<T>,
+}
+
+impl<Pixel> PixelVec<Pixel> {
+
+    /// Create a new flattened pixel storage, filled with default pixels.
+    /// Accepts a `Channels` parameter, which is not used, so that it can be passed as a function pointer instead of calling it.
+    pub fn constructor<Channels>(resolution: Vec2<usize>, _: &Channels) -> Self where Pixel: Default + Clone {
+        PixelVec { resolution, pixels: vec![Pixel::default(); resolution.area()] }
+    }
+
+    /// Examine a pixel of a `PixelVec<T>` image.
+    /// Can usually be used as a function reference instead of calling it directly.
+    #[inline]
+    pub fn get_pixel(&self, position: Vec2<usize>) -> &Pixel where Pixel: Sync {
+        &self.pixels[self.compute_pixel_index(position)]
+    }
+
+    /// Update a pixel of a `PixelVec<T>` image.
+    /// Can usually be used as a function reference instead of calling it directly.
+    #[inline]
+    pub fn set_pixel(&mut self, position: Vec2<usize>, pixel: Pixel) {
+        let index = self.compute_pixel_index(position);
+        self.pixels[index] = pixel;
+    }
+
+    /// Create a new flattened pixel storage, checking the length of the provided pixels vector.
+    pub fn new(resolution: impl Into<Vec2<usize>>, pixels: Vec<Pixel>) -> Self {
+        let size = resolution.into();
+        assert_eq!(size.area(), pixels.len(), "expected {} samples, but vector length is {}", size.area(), pixels.len());
+        Self { resolution: size, pixels }
+    }
+
+    /// Compute the flat index of a specific pixel. Returns a range of either 3 or 4 samples.
+    /// The computed index can be used with `PixelVec.samples[index]`.
+    /// Panics for invalid sample coordinates.
+    #[inline]
+    pub fn compute_pixel_index(&self, position: Vec2<usize>) -> usize {
+        position.flat_index_for_size(self.resolution)
+    }
+}
+
+use crate::image::validate_results::{ValidateResult, ValidationResult};
+
+impl<Px> ValidateResult for PixelVec<Px> where Px: ValidateResult {
+    fn validate_result(&self, other: &Self, options: ValidationOptions, location: impl Fn() -> String) -> ValidationResult {
+        if self.resolution != other.resolution { Err(location() + " > resolution") }
+        else { self.pixels.as_slice().validate_result(&other.pixels.as_slice(), options, || location() + " > pixels") }
+    }
+}
+
+impl<Px> GetPixel for PixelVec<Px> where Px: Clone + Sync {
+    type Pixel = Px;
+    fn get_pixel(&self, position: Vec2<usize>) -> Self::Pixel {
+        self.get_pixel(position).clone()
+    }
+}
+
+use std::fmt::*;
+
+impl<T> Debug for PixelVec<T> {
+    #[inline] fn fmt(&self, formatter: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(formatter, "[{}; {}]", std::any::type_name::<T>(), self.pixels.len())
+    }
+}
+