From 5139fa82f787b368e4c22a576a947adce38cdffb Mon Sep 17 00:00:00 2001
From: bendn <bend.n@outlook.com>
Date: Wed, 6 Sep 2023 18:36:44 +0700
Subject: [PATCH] add make()

---
 Cargo.toml |  2 +-
 src/lib.rs | 27 ++++++++++++++++++++++++++-
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 60b0735..5a3e147 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "fimg"
-version = "0.3.0"
+version = "0.3.1"
 authors = ["bend-n <bend.n@outlook.com>"]
 license = "MIT"
 edition = "2021"
diff --git a/src/lib.rs b/src/lib.rs
index f0a7dc7..79eb558 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -3,9 +3,11 @@
 //! Provides fast image operations, such as rotation, flipping, and overlaying.
 #![feature(
     slice_swap_unchecked,
+    generic_const_exprs,
     slice_as_chunks,
     unchecked_math,
     portable_simd,
+    const_option,
     array_chunks,
     test
 )]
@@ -19,7 +21,7 @@
     clippy::dbg_macro,
     missing_docs
 )]
-#![allow(clippy::zero_prefixed_literal)]
+#![allow(clippy::zero_prefixed_literal, incomplete_features)]
 
 use std::{num::NonZeroU32, slice::SliceIndex};
 
@@ -140,6 +142,29 @@ impl<const CHANNELS: usize> Image<&[u8], CHANNELS> {
             buffer: self.buffer,
         }
     }
+
+    /// Create a new immutable image of width x, y.
+    ///
+    /// # Panics
+    ///
+    /// if width || height == 0
+    ///
+    /// ```
+    /// # use fimg::Image;
+    /// let img = Image::make::<5, 5>();
+    /// # let img: Image<_, 4> = img;
+    /// ```
+
+    pub const fn make<'a, const WIDTH: u32, const HEIGHT: u32>() -> Image<&'a [u8], CHANNELS>
+    where
+        [(); CHANNELS * WIDTH as usize * HEIGHT as usize]: Sized,
+    {
+        Image {
+            width: NonZeroU32::new(WIDTH).expect("passed zero width to builder"),
+            height: NonZeroU32::new(HEIGHT).expect("passed zero height to builder"),
+            buffer: &[0; CHANNELS * WIDTH as usize * HEIGHT as usize],
+        }
+    }
 }
 
 impl<T: std::ops::Deref<Target = [u8]>, const CHANNELS: usize> Image<T, CHANNELS> {