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Add basic thumbnail extraction to Rawkit (#2659)

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* Add `CompressionValue`

* Rename `Transform` to `OrientationValue`

* Add basic thumbnail extraction

* Add `ThumbnailFormat`

* fmt + clippy fixes
This commit is contained in:
Dr George Atkinson
2025-12-21 02:08:21 +00:00
committed by GitHub
parent d441a02e72
commit c21ccf5284
9 changed files with 171 additions and 80 deletions
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32
libraries/rawkit/src/postprocessing/transform.rs
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@@ -1,16 +1,16 @@
use crate::{Image, Pixel, Transform};
use crate::{Image, OrientationValue, Pixel};
impl Image<u16> {
pub fn transform_iter(&self) -> (usize, usize, impl Iterator<Item = Pixel> + use<'_>) {
let (final_width, final_height) = if self.transform.will_swap_coordinates() {
pub fn orientation_iter(&self) -> (usize, usize, impl Iterator<Item = Pixel> + use<'_>) {
let (final_width, final_height) = if self.orientation.will_swap_coordinates() {
(self.height, self.width)
} else {
(self.width, self.height)
};
let index_0_0 = inverse_transform_index(self.transform, 0, 0, self.width, self.height);
let index_0_1 = inverse_transform_index(self.transform, 0, 1, self.width, self.height);
let index_1_0 = inverse_transform_index(self.transform, 1, 0, self.width, self.height);
let index_0_0 = inverse_orientation_index(self.orientation, 0, 0, self.width, self.height);
let index_0_1 = inverse_orientation_index(self.orientation, 0, 1, self.width, self.height);
let index_1_0 = inverse_orientation_index(self.orientation, 1, 0, self.width, self.height);
let column_step = (index_0_1.0 - index_0_0.0, index_0_1.1 - index_0_0.1);
let row_step = (index_1_0.0 - index_0_0.0, index_1_0.1 - index_0_0.1);
@@ -42,16 +42,16 @@ impl Image<u16> {
}
}
pub fn inverse_transform_index(transform: Transform, mut row: usize, mut column: usize, width: usize, height: usize) -> (i64, i64) {
let value = match transform {
Transform::Horizontal => 0,
Transform::MirrorHorizontal => 1,
Transform::Rotate180 => 3,
Transform::MirrorVertical => 2,
Transform::MirrorHorizontalRotate270 => 4,
Transform::Rotate90 => 6,
Transform::MirrorHorizontalRotate90 => 7,
Transform::Rotate270 => 5,
pub fn inverse_orientation_index(orientation: OrientationValue, mut row: usize, mut column: usize, width: usize, height: usize) -> (i64, i64) {
let value = match orientation {
OrientationValue::Horizontal => 0,
OrientationValue::MirrorHorizontal => 1,
OrientationValue::Rotate180 => 3,
OrientationValue::MirrorVertical => 2,
OrientationValue::MirrorHorizontalRotate270 => 4,
OrientationValue::Rotate90 => 6,
OrientationValue::MirrorHorizontalRotate90 => 7,
OrientationValue::Rotate270 => 5,
};
if value & 4 != 0 {