Colormap Registry

An on-chain registry for colormaps.

The motivation for this was to provide an easy way to query a palette of colors based on some value. One can write util functions to generate colors based on some values, but without a registry, the output is quite primitive. ColormapRegistry was implemented to allow any possible colormap to be implemented in a streamlined, generalized way. Thus, after computing and registering a colormap, any contract will be able to easily read and use the color value on-chain.

Colormap identification

Colormaps on the registry are content addressed. This means colormaps are identified via the hash of their definition (see _computeColormapHash in ColormapRegistry, rather than a separate ID or name. It's not the optimal DX, but this way, the registry runs permissionlessly and immutably without an owner.

Colormap definition

There are 2 ways to define a colormap:

via segment data
or via a palette generator.

Segment data contains 1 uint256 each for red, green, and blue describing their intensity values along the colormap. Each uint256 contains 24-bit words bitpacked together with the following structure (bits are right-indexed):

Bits	Meaning
`23 - 16`	Position in the colormap the segment begins from
`15 - 08`	Intensity of R, G, or B the previous segment ends at
`07 - 00`	Intensity of R, G, or B the next segment starts at

Given some position, the output will be computed via linear interpolations on the segment data for R, G, and B. A maximum of 10 of these 24-bit words fit within 256 bits, so up to 9 segments can be defined.

If you need more granularity or a nonlinear palette function, you may implement IPaletteGenerator and define a colormap with that.

Deployments

The following are deployments of ColormapRegistry. To see a list of registered colormaps, see REGISTERED_COLORMAPS.md.

Chain	Chain ID	`v0.0.1`	`v0.0.2`
Mainnet	1	`0x0000000012883D1da628e31c0FE52e35DcF95D50`	`0x00000000A84FcdF3E9C165e6955945E87dA2cB0D`
Goerli	5	`0x0000000012883D1da628e31c0FE52e35DcF95D50`	Not deployed
Canto	7700	`0x0000000012883D1da628e31c0FE52e35DcF95D50`	Not deployed
Base	8453	Not deployed	`0x00000000A84FcdF3E9C165e6955945E87dA2cB0D`
Base Goerli	84531	Not deployed	`0x00000000A84FcdF3E9C165e6955945E87dA2cB0D`

View `v0.0.2` deployment details

The deployments for `v0.0.2` were deployed through the `ImmutableCreate2Factory`at`0x0000000000FFe8B47B3e2130213B802212439497` with the salt

0x00000000000000000000000000000000000000008595513898c6a9029eafa090

and the bytecode

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which was compiled with the compiler version v0.8.21+commit.d9974bed and 1000000 optimizer runs.

View `v0.0.1` deployment details

The deployments for `v0.0.1` were deployed through the `ImmutableCreate2Factory`at`0x0000000000FFe8B47B3e2130213B802212439497` with the salt

0x00000000000000000000000000000000000000000e558e93fbb8d803204fdbdb

and the bytecode

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which was compiled with the compiler version v0.8.17+commit.8df45f5f and 1000000 optimizer runs.

If you deploy the registry to other EVM chains, please make a PR to add it here.

Usage

Reading a colormap

The registry allows querying values with either a uint8 in $[0, 255]$ or a 18 decimal fixed point number in $[0, 1]$ for extra resolution (see comments in ColormapRegistry for more info).

To read a color's R, G, and B values from a colormap 42.195% along the way, you can run the following:

(uint256 r, uint256 g, uint256 b) = ColormapRegistry.getValue({
    _hash: "COLORMAP_HASH",
    _position: 0.42195e18
});

To read a color's R, G, and B values from a colormap $\frac{42}{255}$ along the way, you can run the following:

(uint8 r, uint8 g, uint8 b) = ColormapRegistry.getValueAsUint8({ _hash: "COLORMAP_HASH", _position: 42 });

To read a color as a 24-bit hexstring from a colormap $\frac{42}{255}$ along the way, you can run the following:

string memory colorHex = ColormapRegistry.getValueAsHexString({ _hash: "COLORMAP_HASH", _position: 42 });

Registering a colormap

To register a colormap via segment data, compute the segment data following the representation defined by the registry. Then, run the following:

ColormapRegistry.register(segmentData);

To register a colormap via a palette generator, first implement and deploy an instance of IPaletteGenerator. Then, run the following:

ColormapRegistry.register(paletteGenerator);

Note

The registry (>=v0.0.2) also comes with batch register functions batchRegister via palette generator and segment data.

Local development

This project uses Foundry as its development/testing framework.

Installation

First, make sure you have Foundry installed. Then, run the following commands to clone the repo and install its dependencies:

git clone https://github.com/fiveoutofnine/colormap-registry.git
cd colormap-registry
forge install

Testing

To run tests, run the following command:

forge test

Coverage

To view coverage, run the following command:

forge coverage

To generate a report, run the following command:

forge coverage --report lcov

Note

It may be helpful to use an extension like Coverage Gutters to display the coverage over the code.

Verifying `ColormapRegistry`

To verify the contract on Etherscan, run the following command:

forge verify-contract --chain-id $CHAIN_ID --num-of-optimizations 1000000 --watch --compiler-version $COMPILER_VERSION $DEPLOY_ADDRESS src/ColormapRegistry.sol:ColormapRegistry $ETHERSCAN_KEY

Credits

This project was built by fiveoutofnine for Curta.

The colormaps added in DeployScript were adapted from matplotlib via generate_cmaps.py.

Disclaimer

These smart contracts are being provided as is. No guarantee, representation or warranty is being made, express or implied, as to the safety or correctness of the user interface or the smart contracts. They have not been audited and as such there can be no assurance they will work as intended, and users may experience delays, failures, errors, omissions, loss of transmitted information or loss of funds. The creators are not liable for any of the foregoing. Users should proceed with caution and use at their own risk.

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