fast image operations
| -rw-r--r-- | src/indexed.rs | 1 | ||||
| -rw-r--r-- | src/indexed/builder.rs | 20 |
2 files changed, 21 insertions, 0 deletions
diff --git a/src/indexed.rs b/src/indexed.rs index 426565d..e0f4412 100644 --- a/src/indexed.rs +++ b/src/indexed.rs @@ -107,6 +107,7 @@ impl<I, P> IndexedImage<I, P> { .ok_or("not all indexes are in palette") } } + impl<P, I: uint> IndexedImage<Box<[MaybeUninit<I>]>, P> { /// Assumes this MU image is, in fact, initialized. You must be very sure that it is. Also, none of the pixels can be out of bounds. pub unsafe fn assume_init(self) -> IndexedImage<Box<[I]>, P> { 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() } + } } |