Function: decodeColormapSprite()

decodeColormapSprite(source): Promise<ImageData>

Defined in: decode-colormap-sprite.ts:25

Decode a colormap sprite image into ImageData. Does not require a GPU Device, so it can run during app startup in parallel with the device-creation path; pair with createColormapTexture once the device is available.

Supported source forms:

• ArrayBuffer / Uint8Array: wrapped in a Blob and decoded via createImageBitmap.
• ImageBitmap: drawn into an OffscreenCanvas to extract pixels.

To decode from a URL, fetch the bytes first:

const bytes = await (await fetch(colormapsUrl)).arrayBuffer();
const imageData = await decodeColormapSprite(bytes);

Avoiding a string overload here keeps the helper from having to disambiguate URL / base64 / data-URL inputs.

Parameters

source

ColormapSpriteSource

Returns

Promise<ImageData>