Use color for color.

[waywardmonkeys]

Color functionality is now provided by the color crate.

[waywardmonkeys]

Some of these will be resolved in color and some here in this crate:

• Default for colors
• PartialEq
• PartialOrd (needed by ColorStop at least)
• Hash
• Add legacy_color feature (enabled by default for now) that feature gates the existing peniko::Color
• Do the work on Gradient
• Better solution for disabling some clippy lints for allow attributes
• serde support in color (Optionally support serde. color#61)
• Decide what type(s) to export
• Consider renaming mul_alpha to multiply_alpha in color (Rename mul_alpha to multiply_alpha color#65)
• Create a branch of Vello using this and see what the issues are (Update to new peniko with color vello#742)

[waywardmonkeys]

I've done more work here updating most of the gradient code, adding a feature to disable the legacy color code, and adding some more comments.

There are some FIXME(color) comments in the code to help point to things that need resolution in conjunction with the list in a comment above.

[waywardmonkeys]

I think I will remove the legacy code instead, and export a type alias Color that is the same as AlphaColor<Srgb> as that would simplify updating Vello.

[tomcur]

(Just a note: with color becoming 32-bit per channel, maybe peniko::Image::alpha should become f32.)

peniko/src/image.rs

Lines 37 to 50 in d825bdf

	pub struct Image {
	/// Blob containing the image data.
	pub data: Blob<u8>,
	/// Pixel format of the image.
	pub format: Format,
	/// Width of the image.
	pub width: u32,
	/// Height of the image.
	pub height: u32,
	/// Extend mode.
	pub extend: Extend,
	/// An additional alpha multiplier to use with the image.
	pub alpha: u8,
	}

[waywardmonkeys]

This is now rebased on top of #65 and includes the changes needed for the MSRV bump. The MSRV bump ended up being much simpler once the old peniko::Color was gone along with the changes in #65, so it didn't add significant noise to this PR.

[waywardmonkeys]

(Just a note: with color becoming 32-bit per channel, maybe peniko::Image::alpha should become f32.)

I did this in #65 as it let me simplify some of the MSRV issues.

[xStrom]

Some initial thoughts on the changelog. 😈

[xStrom]

I have not tried running the code with Vello or anything like that, but the code changes look fine to me.

[DJMcNab]

🙃