Fix buffer checks in blit_from

src/canvas.rs

@@ -88,6 +88,7 @@ impl Canvas {
     /// Blits to a rectangle with origin at `dst_point` and size according to `src_size`.
     /// If the target area overlaps the boundaries of the canvas, only the drawable region is blitted.
     /// `dst_point` and `src_size` are specified in pixels. `src_stride` is specified in bytes.
+    /// `src_stride` must be equal or larger than the actual data length.
     #[allow(dead_code)]
     pub(crate) fn blit_from(
         &mut self,
@@ -98,16 +99,15 @@ impl Canvas {
         src_format: Format,
     ) {
         assert_eq!(
-            src_size.x() as usize * src_size.y() as usize,
-            src_bytes.len() / src_format.bytes_per_pixel(),
-            "Number of pixels in src_bytes does not match src_size."
+            src_stride * src_size.y() as usize,
+            src_bytes.len(),
+            "Number of pixels in src_bytes does not match stride and size."
         );
-        // It might be preferable to drop src_stride as a parameter to get rid of this check.
-        assert_eq!(
-            src_size.x() as usize * src_format.bytes_per_pixel(),
-            src_stride,
-            "src_stride does not match src_size.x()"
+        assert!(
+            src_stride >= src_size.x() as usize * src_format.bytes_per_pixel(),
+            "src_stride must be >= than src_size.x()"
         );
+
 
         let dst_rect = RectI::new(dst_point, src_size);
         let dst_rect = dst_rect.intersection(RectI::new(Vector2I::default(), self.size));