Add forgotten file.

src/op/rectangle.rs

@@ -0,0 +1,67 @@
+use crate::{
+    bitmap::{BitmapDataMut, MakeMutView},
+    colour::Colour,
+    math::{PixelBox, PixelPoint, PixelSideOffsets},
+};
+
+use super::{GenericUnary, UnaryDispatch, UnaryOpSpec, KahloOps};
+
+pub struct RectangleOp;
+
+type Params<'l> = (PixelBox, usize, Colour);
+
+#[cfg(test)]
+const _ : () = {
+    use super::generate;
+    impl generate::UnaryInputSpec for RectangleOp {
+        fn gen<'l>() -> impl generate::ValueGeneratorList<'l, OutputTuple = Self::Params<'l>> {
+            (generate::dst_area, generate::uniform(1,5), generate::random_colour,)
+        }
+    }
+};
+
+impl UnaryOpSpec for RectangleOp {
+    type Params<'l> = Params<'l>;
+    fn build<'l>() -> UnaryDispatch<Self::Params<'l>> {
+        UnaryDispatch::from_generic::<Self>()
+    }
+}
+
+impl<'l> GenericUnary<Params<'l>> for RectangleOp {
+    fn perform<Format: crate::formats::PixelFormatSpec>(
+        mut write_data: &mut dyn BitmapDataMut,
+        params: &Params<'l>,
+    ) {
+        // get a KahloOps for the image
+        let mut subregion = write_data.make_view_mut::<Format>(PixelBox::from_size(write_data.size()));
+        let (area, width, colour) = params;
+
+        let maxmin = PixelPoint::new(area.max.x, area.min.y);
+        let minmax = PixelPoint::new(area.min.x, area.max.y);
+
+        let width = (*width as i32) - 1;
+
+        // top side
+        subregion.fill_region(PixelBox::from_points([area.min, maxmin]).outer_box(PixelSideOffsets {
+            bottom: width,
+            ..Default::default()
+        }), *colour);
+        // bottom side
+        subregion.fill_region(PixelBox::from_points([minmax, area.max]).outer_box(PixelSideOffsets {
+            top: width,
+            ..Default::default()
+        }), *colour);
+
+        // left side
+        subregion.fill_region(PixelBox::from_points([area.min, minmax]).outer_box(PixelSideOffsets {
+            right: width,
+            ..Default::default()
+        }), *colour);
+        // right side
+        subregion.fill_region(PixelBox::from_points([maxmin, area.max]).outer_box(PixelSideOffsets {
+            left: width,
+            ..Default::default()
+        }), *colour);
+    }
+}
+