**BREAKING**: Added a new variant of enum CropBoxError::WidthOrHeightLessOrEqualToZero.

CHANGELOG.md

@@ -1,3 +1,9 @@
+## [Unreleased] - ReleaseDate
+
+### Added
+
+- **BREAKING**: Added a new variant of enum `CropBoxError::WidthOrHeightLessOrEqualToZero`.
+
 ## [3.0.0] - 2024-02-04
 
 ### Added

src/errors.rs

@@ -22,6 +22,8 @@ pub enum CropBoxError {
     PositionIsOutOfImageBoundaries,
     #[error("Size of the crop box is out of the image boundaries")]
     SizeIsOutOfImageBoundaries,
+    #[error("Width or height of the crop box is less or equal to zero")]
+    WidthOrHeightLessOrEqualToZero,
 }
 
 #[derive(Error, Debug, Clone, Copy)]

src/image_view.rs

@@ -126,6 +126,9 @@ where
         let width_f = self.width().get() as f64;
         let height_f = self.height().get() as f64;
 
+        if crop_box.width <= 0. || crop_box.height <= 0. {
+            return Err(CropBoxError::WidthOrHeightLessOrEqualToZero);
+        }
         if crop_box.left < 0.
             || crop_box.top < 0.
             || crop_box.left >= width_f

tests/resize_tests.rs

@@ -860,12 +860,52 @@ mod not_u8x4 {
 mod u8x4 {
     use std::f64::consts::PI;
 
-    use fast_image_resize::Filter;
+    use fast_image_resize::{CropBoxError, Filter, ImageView};
 
     use super::*;
 
     type P = U8x4;
 
+    #[test]
+    fn set_crop_box() {
+        let mut view: ImageView<P> =
+            ImageView::from_buffer(nonzero(1), nonzero(1), &[0, 0, 0, 0]).unwrap();
+
+        for (left, top) in [(1., 0.), (0., 1.)] {
+            assert_eq!(
+                view.set_crop_box(CropBox {
+                    left,
+                    top,
+                    width: 1.,
+                    height: 1.
+                }),
+                Err(CropBoxError::PositionIsOutOfImageBoundaries)
+            );
+        }
+        for (width, height) in [(2., 1.), (1., 2.)] {
+            assert_eq!(
+                view.set_crop_box(CropBox {
+                    left: 0.,
+                    top: 0.,
+                    width,
+                    height
+                }),
+                Err(CropBoxError::SizeIsOutOfImageBoundaries)
+            );
+        }
+        for (width, height) in [(0., 1.), (1., 0.), (-1., 1.), (1., -1.)] {
+            assert_eq!(
+                view.set_crop_box(CropBox {
+                    left: 0.,
+                    top: 0.,
+                    width,
+                    height
+                }),
+                Err(CropBoxError::WidthOrHeightLessOrEqualToZero)
+            );
+        }
+    }
+
     #[test]
     fn downscale_u8x4() {
         P::downscale_test(