bendns' repos / fimg
fast image operations
Diffstat (limited to 'src/indexed/builder.rs')
-rw-r--r--src/indexed/builder.rs20
1 files changed, 20 insertions, 0 deletions
diff --git a/src/indexed/builder.rs b/src/indexed/builder.rs
index c774712..b00c12f 100644
--- a/src/indexed/builder.rs
+++ b/src/indexed/builder.rs
@@ -85,4 +85,24 @@ impl<B, P> Builder<B, P> {
palette: self.palette.expect("require palette"),
}
}
+
+ /// Safety
+ ///
+ /// read implementation
+ pub unsafe fn from_iter<I: uint, J>(
+ self,
+ iter: impl Iterator<Item = ((u32, u32), I)> + ExactSizeIterator,
+ ) -> Image<Box<[I]>, P>
+ where
+ P: AsRef<[J]>,
+ {
+ debug_assert!(iter.len() >= self.width as usize * self.height as usize);
+ let mut me = self.uninit();
+ // SAFETY: the pixel must be in bounds
+ iter.for_each(|((x, y), item)| unsafe {
+ me.pixel_mut(x, y).write(item);
+ });
+ // SAFETY: all pixels must have been visited at least once
+ unsafe { me.assume_init() }
+ }
}