From cb2050aea4e46c33dba479c4ac1d08af90d1428c Mon Sep 17 00:00:00 2001
From: Varphone Wong <varphone@qq.com>
Date: Wed, 28 Feb 2024 09:58:03 +0800
Subject: [PATCH] `epaint`: Added `ColorImage::from_rgba_vec` constructor

This is typically used when there's an existing image buffer and memory copying is to be avoided.
---
 crates/epaint/src/image.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/crates/epaint/src/image.rs b/crates/epaint/src/image.rs
index f653be2e7..6ae93f087 100644
--- a/crates/epaint/src/image.rs
+++ b/crates/epaint/src/image.rs
@@ -111,6 +111,16 @@ impl ColorImage {
         Self { size, pixels }
     }
 
+    /// Creates a [`ColorImage`] with an existing image buffer.
+    ///
+    /// This is typically used when you want to avoid unnecessary memory copying by reusing an existing image buffer.
+    ///
+    /// Panics if `size[0] * size[1] != pixels.len()`.
+    pub fn from_rgba_vec(size: [usize; 2], pixels: Vec<Color32>) -> Self {
+        assert_eq!(size[0] * size[1], pixels.len());
+        Self { size, pixels }
+    }
+
     /// Create a [`ColorImage`] from flat opaque gray data.
     ///
     /// Panics if `size[0] * size[1] != gray.len()`.