import type { Fn } from "@thi.ng/api" ; import { typedArray , typedArrayType } from "@thi.ng/api/typedarray" ; import { quickSort } from "@thi.ng/arrays/quicksort" ; import { sortByCachedKey } from "@thi.ng/arrays/sort-cached" ; import { swap } from "@thi.ng/arrays/swap" ; import { compareNumAsc , compareNumDesc } from "@thi.ng/compare/numeric" ; import type { ColorDistance , ReadonlyColor , TypedColor } from "./api.js" ; import { distEucledian3 } from "./distance.js" ; import { intAbgr32Srgb } from "./int/int-srgb.js" ; export const selectChannel = ( id ) => ( col ) => col [ id ] ; /**
 * Takes a `target` color and optional `distance` function (default:
 *  distEucledian3 ). Returns a new function which can be used as `key`
 * function for  sort to compute the distance metric of a color to the
 * given `target`.
 *
 *  param target param dist export const proximity = ( target , dist = distEucledian3 ) => ( col ) => dist ( target , col ) ; /**
 * Similar to  proximity , but intended as syntax sugar for  ABGR * input colors. The proximity will still be computed using given distance
 * function (default:  distEucledian3 ) and will be in sRGB space. Hence
 * given `target` color should be provided in the same space too.
 *
 *  param target param dist export const proximityABGR32 = ( target , dist = distEucledian3 ) => ( col ) => dist ( target , intAbgr32Srgb ( [ ] , col [ 0 ] ) ) ; export const sort = ( colors , key , isReverse = false ) => sortByCachedKey ( colors , key , isReverse ? compareNumDesc : compareNumAsc ) ; /**
 * Similar to  sort , but only for memory mapped colors (e.g. mapping a
 * pixel buffer). Does NOT change the order of elements in given `colors` array,
 * BUT sorts the **apparent** order by swapping the contents of the backing
 * memory.
 *
 * ```ts
 * // memory buffer of 4 sRGB colors
 * const buf = new Float32Array([0,1,0,1, 0,0.5,0,1, 0,0.25,0,1, 0,0.75,0,1]);
 *
 * // map buffer (creates 4 SRGB instances linked to the buffer)
 * const pix = srgb.mapBuffer(buf);
 *
 * // display original order
 * pix.map(css);
 * // [ '#00ff00', '#008000', '#004000', '#00bf00' ]
 *
 * // sort colors (buffer!) by luminance
 * sortMapped(pix, luminanceSrgb);
 *
 * // new order
 * pix.map(css);
 * // [ '#004000', '#008000', '#00bf00', '#00ff00' ]
 *
 * // buffer contents have been re-ordered
 * buf
 * // Float32Array(16) [
 * //     0, 0.25, 0, 1,    0,
 * //   0.5,    0, 1, 0, 0.75,
 * //     0,    1, 0, 1,    0,
 * //     1
 * // ]
 * ```
 *
 *  param colors param key param isReverse export const sortMapped = < T extends TypedColor < any > > ( colors , key , isReverse = false ) => { if ( ! colors . length ) return colors ; const keys = colors . map ( key ) ; const tmp = typedArray ( typedArrayType ( colors [ 0 ] . buf ) , colors [ 0 ] . length ) ; quickSort ( keys , isReverse ? compareNumDesc : compareNumAsc , ( _ , x , y ) => { swap ( keys , x , y ) ; tmp . set ( colors [ x ] ) ; colors [ x ] . set ( colors [ y ] ) ; colors [ y ] . set ( tmp ) ; } ) ; return colors ; } ;