Add changelog for image-canvas

Author: 197g

canvas/Changes.md

@@ -1,3 +1,21 @@
+## 0.4.0
+
+This adds support for packed blocks and incomplete YUV color support.
+
+Bug fixes:
+- Fixed a buf where bitfield sample parts referred to the wrong bits.
+
+New features:
+- Added `Block::Pack1x{2,4,8}` which refer to texel containing multiple pixels
+  by bit-packing their sample parts in sequence.
+- Added `Block::Yuv422,Yuy2,Yuv411` which refer to texels containing multiple
+  pixels by subsampling some of their sample parts. Their implementation with
+  regards to bit packing and unpacking is not yet final.
+- Added `SampleParts::{UInt1x8,UInt2x4}` to complement bit packing blocks with
+  more low-depth channels in a single texel.
+- More information in `LayoutError` for debugging.
+- Added a hidden `Color::Yuv`, not part of the official SemVer interface yet.
+
 ## 0.3.1 (Mustafar)
 
 This release is complete enough to provide all relevant RGB-Lab interaction.

canvas/src/color.rs

@@ -29,6 +29,8 @@ pub enum Color {
         luminance: Luminance,
     },
     /// A lightness, chroma difference scheme.
+    #[doc(hidden)]
+    #[deprecated = "DO NOT USE THIS YET! It's members are not final."]
     Yuv {
         primary: Primaries,
         whitepoint: Whitepoint,
@@ -327,6 +329,7 @@ impl Color {
         whitepoint: Whitepoint::D65,
     };
 
+    #[allow(deprecated)]
     pub const BT709: Color = Color::Yuv {
         luminance: Luminance::Sdr,
         primary: Primaries::Bt709,