mirror of
https://github.com/Nexoniarz/YAPF.git
synced 2026-11-02 20:44:27 +00:00
2ca726e3af
Format (version 1, replaces the earlier experimental versions): - per-tile YCoCg-R or subtract-green colour transform, 8-bit modular - 12 row filters per 8-row band (Left, Gradient, Up-right, Up-average, Up 1-8 rows), none with more than a one-add serial dependency - residuals in groups of 8 at the group's width (w bits x 8 = w bytes), 4-bit control codes with repeat-previous-width runs chosen by DP - constant and stored tiles, independent 64x64 tiles, mips, GPU hints - all sizes validated before decoding; corrupt input is rejected Library: - SIMD on by default: SSSE3 (runtime CPUID check; GCC, Clang, MSVC, MinGW) and NEON on ARM64; -DYAPF_NO_SIMD for plain C - yapf_load_memory, yapf_load_mt, yapf_load_memory_mt - 6-10x faster decoding than PNG (stb_image) on one core; -O2 and -O3 builds perform the same - fixes for macOS (sysconf) and the Windows import library exports Tools and integrations: - `yapf` CLI: convert PNG/JPG/TGA/BMP/PSD/GIF <-> YAPF, info, bench, thumbnail, mips - JavaScript and Python bindings (byte-identical to the C encoder) - GIMP 3 plugin: exports the flattened image, optional mipmaps - Blender extension: import (also as plane), export, drag and drop - VS Code preview, Figma plugin, Photoshop scripts, Linux MIME type and thumbnailer - Makefile, updated build.sh / build.bat, tools/build_release.sh - tests/test_yapf.c (784 checks) and bindings/js/test.js Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
463 lines
18 KiB
JavaScript
463 lines
18 KiB
JavaScript
/*
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* yapf.js — YAPF v1 encoder / decoder in plain JavaScript.
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*
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* Copyright 2026 Nexoniarz — Apache License 2.0.
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*
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* Works in browsers, Node.js, Figma plugins and VS Code webviews; no
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* dependencies. Produces exactly the same bytes as the C library.
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*
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* const img = YAPF.decode(bytes); // Uint8Array → image
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* const file = YAPF.encode(img); // image → Uint8Array
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* const rgba = YAPF.toRGBA(img); // any channel count → RGBA pixels
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*
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* An image is { width, height, channels (1–4), pixels: Uint8Array,
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* gpuFormat, flags, mipLevels, mips: [Uint8Array, …] }.
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* The specification is the comment at the top of yapf.h.
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*/
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(function (root, factory) {
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if (typeof module === 'object' && module.exports) module.exports = factory();
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else root.YAPF = factory();
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}(typeof self !== 'undefined' ? self : this, function () {
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'use strict';
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const TILE = 64, TILE_PX = TILE * TILE, GROUP = 8, BAND = 8, RING = 16;
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const MAX_GROUPS = TILE_PX / GROUP, MAX_DIM = 65535, MAX_MIPS = 16;
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const STORED = 0x80, SUBGREEN = 0x10, NIB_REPEAT = 9;
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const F_LEFT = 0, F_GRAD = 1, F_UPRIGHT = 2, F_UPAVG = 3, F_UP = 16;
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const NIB_GROUPS = [1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 3, 4, 8, 16, 32, 64];
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const RUN_LENS = [2, 3, 4, 8, 16, 32, 64];
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/* Encoder try order: cheapest to decode first, ties go to the earlier. */
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const FILTERS = [F_UP, F_UP + 1, F_UP + 2, F_UP + 3, F_UP + 4, F_UP + 5,
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F_UP + 6, F_UP + 7, F_UPRIGHT, F_UPAVG, F_LEFT, F_GRAD];
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const GPU = { RGBA8: 0, RGB8: 1, RG8: 2, R8: 3, SRGB8_A8: 4, SRGB8: 5 };
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const FLAG = { PREMULT_ALPHA: 1, SRGB: 2 };
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const ZERO_ROW = new Uint8Array(TILE + 1);
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const zz = (r) => ((r << 1) ^ ((r << 24) >> 31)) & 255; /* r is 0..255 */
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const unzz = (z) => ((z >>> 1) ^ -(z & 1)) & 255;
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const width = (z) => (z === 0 ? 0 : 32 - Math.clz32(z));
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const s8 = (v) => (v << 24) >> 24;
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const filterValid = (f) => f <= F_UPAVG || (f >= F_UP && f < F_UP + 8);
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const upK = (f) => (f >= F_UP ? f - F_UP + 1 : 1);
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function corrupt() { throw new Error('YAPF: corrupt or unsupported file'); }
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/* ── Decoder ──────────────────────────────────────────────────────── */
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function unpackPlane(b, p, end, z, tw, th) {
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const total = tw * th, ng = (total + GROUP - 1) >> 3, nb = (th + BAND - 1) >> 3;
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if (end - p < nb) corrupt();
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const filt = b.subarray(p, p + nb);
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p += nb;
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for (let i = 0; i < nb; i++) if (!filterValid(filt[i])) corrupt();
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const gw = new Uint8Array(ng + 64);
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let data = 0, g = 0, hi = 0, w = 0;
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while (g < ng) {
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if (p >= end) corrupt();
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const c = (b[p] >> (hi * 4)) & 15, n = NIB_GROUPS[c];
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p += hi; hi ^= 1;
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if (c < NIB_REPEAT) w = c;
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gw.fill(w, g, g + n);
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data += w * n; g += n;
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}
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if (g !== ng) corrupt();
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if (hi) { if (b[p] >> 4) corrupt(); p++; }
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if (end - p < data) corrupt();
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for (g = 0; g < ng; g++) {
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w = gw[g];
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const o = g * GROUP, mask = (1 << w) - 1;
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let acc = 0, bits = 0;
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for (let i = 0; i < GROUP; i++) {
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while (bits < w) { acc |= b[p++] << bits; bits += 8; }
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z[o + i] = acc & mask;
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acc >>>= w; bits -= w;
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}
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}
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return { p, filt };
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}
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function unfilterRow(f, R, r0, U, u0, K, k0, Z, z0, tw) {
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if (f === F_LEFT) {
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let L = 0;
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for (let x = 0; x < tw; x++) R[r0 + x] = L = (L + unzz(Z[z0 + x])) & 255;
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} else if (f === F_GRAD) {
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let L = (U[u0] + unzz(Z[z0])) & 255;
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R[r0] = L;
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for (let x = 1; x < tw; x++)
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R[r0 + x] = L = (L + U[u0 + x] - U[u0 + x - 1] + unzz(Z[z0 + x])) & 255;
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} else {
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/* pred = (a + b) >> 1: Up k a = b = K; Up-right a = b = U + 1;
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* Up-average a = U, b = U + 1. Rows carry one extra sample. */
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let A, a0, B, b0;
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if (f >= F_UP) { A = K; a0 = k0; B = K; b0 = k0; }
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else if (f === F_UPAVG) { A = U; a0 = u0; B = U; b0 = u0 + 1; }
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else { A = U; a0 = u0 + 1; B = U; b0 = u0 + 1; }
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for (let x = 0; x < tw; x++)
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R[r0 + x] = (((A[a0 + x] + B[b0 + x]) >> 1) + unzz(Z[z0 + x])) & 255;
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}
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R[r0 + tw] = R[r0 + tw - 1];
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}
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function decodeTile(b, p, end, out, imgW, tx, ty, tw, th, ch) {
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if (end <= p) corrupt();
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let hdr = b[p++];
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if (hdr === STORED) {
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const rowb = tw * ch;
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if (end - p !== rowb * th) corrupt();
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for (let y = 0; y < th; y++)
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out.set(b.subarray(p + rowb * y, p + rowb * (y + 1)), ((ty + y) * imgW + tx) * ch);
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return;
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}
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if (hdr & 0xE0) corrupt(); /* reserved bits set */
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const xf = hdr & SUBGREEN;
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hdr &= 0x0F;
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if ((hdr >> ch) || (xf && ch < 3)) corrupt();
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const rowLen = TILE + 1, planeLen = RING * rowLen;
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const rows = new Uint8Array(4 * planeLen);
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const z = [], filt = [null, null, null, null];
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for (let c = 0; c < ch; c++) {
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if (!(hdr & (1 << c))) continue;
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if (p >= end) corrupt();
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rows.fill(b[p++], c * planeLen, (c + 1) * planeLen);
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}
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for (let c = 0; c < ch; c++) {
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if (hdr & (1 << c)) continue;
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z[c] = new Uint8Array(TILE_PX + GROUP);
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const r = unpackPlane(b, p, end, z[c], tw, th);
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p = r.p; filt[c] = r.filt;
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}
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if (p !== end) corrupt();
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for (let y = 0; y < th; y++) {
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const ri = (y % RING) * rowLen;
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for (let c = 0; c < ch; c++) {
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if (!filt[c]) continue;
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const f = filt[c][y >> 3], k = upK(f), base = c * planeLen;
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unfilterRow(f, rows, base + ri,
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y ? rows : ZERO_ROW, y ? base + ((y - 1) % RING) * rowLen : 0,
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y >= k ? rows : ZERO_ROW, y >= k ? base + ((y - k) % RING) * rowLen : 0,
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z[c], y * tw, tw);
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}
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let d = ((ty + y) * imgW + tx) * ch;
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const P0 = ri, P1 = planeLen + ri, P2 = 2 * planeLen + ri, P3 = 3 * planeLen + ri;
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for (let x = 0; x < tw; x++, d += ch) {
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if (ch >= 3) {
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if (xf) {
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const g = rows[P0 + x];
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out[d] = rows[P1 + x] + g - 128;
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out[d + 1] = g;
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out[d + 2] = rows[P2 + x] + g - 128;
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} else {
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const co = (rows[P1 + x] - 128) & 255, cg = (rows[P2 + x] - 128) & 255;
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const t = (rows[P0 + x] - (s8(cg) >> 1)) & 255;
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const bb = (t - (s8(co) >> 1)) & 255;
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out[d] = bb + co;
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out[d + 1] = cg + t;
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out[d + 2] = bb;
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}
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if (ch === 4) out[d + 3] = rows[P3 + x];
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} else {
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out[d] = rows[P0 + x];
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if (ch === 2) out[d + 1] = rows[P1 + x];
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}
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}
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}
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}
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const r32 = (b, p) => (b[p] | (b[p + 1] << 8) | (b[p + 2] << 16) | (b[p + 3] << 24)) >>> 0;
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function decode(input) {
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const b = input instanceof Uint8Array ? input : new Uint8Array(input);
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if (b.length < 20 || b[0] !== 0x59 || b[1] !== 0x41 || b[2] !== 0x50 || b[3] !== 0x46)
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throw new Error('YAPF: not a YAPF file');
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if (b[4] !== 1) throw new Error('YAPF: unsupported format version ' + b[4]);
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const ch = b[5], mipLevels = b[7], W = r32(b, 12), H = r32(b, 16);
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if (ch < 1 || ch > 4 || mipLevels < 1 || mipLevels > MAX_MIPS ||
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W < 1 || W > MAX_DIM || H < 1 || H > MAX_DIM) corrupt();
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const idxEnd = 20 + 8 * mipLevels;
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if (b.length < idxEnd) corrupt();
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const mips = [];
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for (let m = 0; m < mipLevels; m++) {
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const off = r32(b, 20 + 8 * m), len = r32(b, 24 + 8 * m);
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const mw = Math.max(1, W >>> m), mh = Math.max(1, H >>> m);
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if (off < idxEnd || off > b.length || len > b.length - off) corrupt();
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const out = new Uint8Array(mw * mh * ch);
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const tcx = Math.ceil(mw / TILE), tcy = Math.ceil(mh / TILE), tcount = tcx * tcy;
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if (len / 4 < tcount) corrupt();
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let pos = off + tcount * 4;
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for (let t = 0; t < tcount; t++) {
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const sz = r32(b, off + t * 4);
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if (sz > off + len - pos) corrupt();
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const tx = (t % tcx) * TILE, ty = Math.floor(t / tcx) * TILE;
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decodeTile(b, pos, pos + sz, out, mw, tx, ty,
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Math.min(TILE, mw - tx), Math.min(TILE, mh - ty), ch);
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pos += sz;
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}
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mips.push(out);
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}
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return { width: W, height: H, channels: ch, gpuFormat: b[6], flags: b[8],
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mipLevels, pixels: mips[0], mips };
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}
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/* ── Encoder ──────────────────────────────────────────────────────── */
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class Out {
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constructor(n) { this.buf = new Uint8Array(Math.max(n, 1024)); this.len = 0; }
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reserve(n) {
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if (this.len + n <= this.buf.length) return;
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let c = this.buf.length * 2;
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while (c < this.len + n) c *= 2;
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const nb = new Uint8Array(c); nb.set(this.buf.subarray(0, this.len)); this.buf = nb;
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}
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push(v) { this.reserve(1); this.buf[this.len++] = v; }
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}
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function predictRow(f, P, r0, u0, k0, pred, tw, U, K) {
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switch (f) {
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case F_LEFT: pred[0] = 0; for (let x = 1; x < tw; x++) pred[x] = P[r0 + x - 1]; break;
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case F_GRAD:
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pred[0] = U[u0];
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for (let x = 1; x < tw; x++) pred[x] = (P[r0 + x - 1] + U[u0 + x] - U[u0 + x - 1]) & 255;
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break;
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case F_UPRIGHT:
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for (let x = 0; x + 1 < tw; x++) pred[x] = U[u0 + x + 1];
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pred[tw - 1] = U[u0 + tw - 1];
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break;
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case F_UPAVG:
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for (let x = 0; x + 1 < tw; x++) pred[x] = (U[u0 + x] + U[u0 + x + 1]) >> 1;
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pred[tw - 1] = U[u0 + tw - 1];
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break;
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default: for (let x = 0; x < tw; x++) pred[x] = K[k0 + x];
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}
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}
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/* Picks a filter per band; fills z and filt; returns estimated cost. */
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function chooseFilters(P, tw, th, z, filt) {
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const total = tw * th, nb = (th + BAND - 1) >> 3;
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const tmp = new Uint8Array(BAND * TILE + GROUP), pred = new Uint8Array(TILE);
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let sum = 0, prevFi = 0;
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for (let b = 0; b < nb; b++) {
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const y0 = b * BAND, y1 = Math.min(y0 + BAND, th), n = (y1 - y0) * tw;
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let bestCost = Infinity, bestFi = 0;
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for (let t = 0; t < FILTERS.length; t++) {
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const fi = t === 0 ? prevFi : (t <= prevFi ? t - 1 : t);
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const f = FILTERS[fi], k = upK(f), serial = f === F_LEFT || f === F_GRAD;
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let cost = 0, done = 0, lost = false;
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for (let y = y0; y < y1 && !lost; y++) {
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const r0 = y * tw;
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const U = y ? P : ZERO_ROW, u0 = y ? r0 - tw : 0;
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const K = y >= k ? P : ZERO_ROW, k0 = y >= k ? r0 - k * tw : 0;
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predictRow(f, P, r0, u0, k0, pred, tw, U, K);
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const T = (y - y0) * tw;
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for (let x = 0; x < tw; x++) tmp[T + x] = zz((P[r0 + x] - pred[x]) & 255);
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const last = y + 1 === y1, end = last ? n : (y + 1 - y0) * tw;
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if (last) tmp.fill(0, n, n + GROUP);
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for (; done + GROUP <= end || (last && done < end); done += GROUP) {
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let m = 0;
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for (let i = 0; i < GROUP; i++) m |= tmp[done + i];
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const w = width(m);
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cost += w ? 16 * w + 8 : 2;
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}
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const c = serial ? cost + Math.floor(cost / 25) : cost;
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if (c > bestCost || (c === bestCost && fi > bestFi)) lost = true;
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}
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if (lost) continue;
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if (serial) cost += Math.floor(cost / 25);
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if (cost < bestCost || (cost === bestCost && fi < bestFi)) {
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bestCost = cost; bestFi = fi;
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z.set(tmp.subarray(0, n), y0 * tw);
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}
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}
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prevFi = bestFi;
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filt[b] = FILTERS[bestFi];
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sum += bestCost;
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}
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z.fill(0, total, total + GROUP);
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return sum;
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}
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function emitPlane(o, z, filt, tw, th) {
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const total = tw * th, ng = (total + GROUP - 1) >> 3, nb = (th + BAND - 1) >> 3;
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o.reserve(nb + ng + ng * 8);
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for (let i = 0; i < nb; i++) o.buf[o.len++] = filt[i];
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const need = new Uint8Array(ng);
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for (let g = 0; g < ng; g++) {
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let m = 0;
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for (let i = 0; i < GROUP; i++) m |= z[g * GROUP + i];
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need[g] = width(m);
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}
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/* span[j][g] = widest need in [g, g + 2^j) */
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const span = [need.slice()];
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for (let j = 1; j < 7; j++) {
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const prev = span[j - 1], cur = new Uint8Array(ng), h = 1 << (j - 1);
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for (let g = 0; g + (1 << j) <= ng; g++) cur[g] = Math.max(prev[g], prev[g + h]);
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span.push(cur);
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}
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const cost = new Uint32Array((ng + 1) * 9), pick = new Uint8Array(ng * 9);
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const mx = new Uint8Array(7);
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for (let g = ng - 1; g >= 0; g--) {
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let lc = Infinity, lk = 0;
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for (let w = need[g]; w <= 8; w++) {
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const c = 1 + 2 * w + cost[(g + 1) * 9 + w];
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if (c < lc) { lc = c; lk = w; }
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}
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let nl = 0;
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for (; nl < 7 && g + RUN_LENS[nl] <= ng; nl++) {
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const L = RUN_LENS[nl];
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mx[nl] = L === 3 ? Math.max(span[1][g], need[g + 2]) : span[31 - Math.clz32(L)][g];
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}
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for (let pw = 0; pw <= 8; pw++) {
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let bc = lc, bk = lk;
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for (let li = 0; li < nl && mx[li] <= pw; li++) {
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const L = RUN_LENS[li], c = 1 + 2 * pw * L + cost[(g + L) * 9 + pw];
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if (c < bc) { bc = c; bk = NIB_REPEAT + li; }
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}
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cost[g * 9 + pw] = bc;
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pick[g * 9 + pw] = bk;
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}
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}
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const gw = new Uint8Array(ng), nib = [];
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let pw = 0;
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for (let g = 0; g < ng;) {
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const k = pick[g * 9 + pw];
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nib.push(k);
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if (k < NIB_REPEAT) { pw = k; gw[g++] = k; }
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else for (let n = 0; n < NIB_GROUPS[k]; n++) gw[g++] = pw;
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}
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for (let k = 0; k < nib.length; k += 2)
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o.buf[o.len++] = nib[k] | (k + 1 < nib.length ? nib[k + 1] << 4 : 0);
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for (let g = 0; g < ng; g++) {
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const w = gw[g];
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let acc = 0, bits = 0;
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for (let i = 0; i < GROUP; i++) {
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acc |= z[g * GROUP + i] << bits; bits += w;
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while (bits >= 8) { o.buf[o.len++] = acc & 255; acc >>>= 8; bits -= 8; }
|
||
}
|
||
}
|
||
}
|
||
|
||
function encodeTile(o, sc, px, imgW, tx, ty, tw, th, ch) {
|
||
const total = tw * th, start = o.len, raw = total * ch, tries = ch >= 3 ? 2 : 1;
|
||
const mask = [0, 0], est = [0, 0];
|
||
for (let t = 0; t < tries; t++) {
|
||
const plane = sc.plane[t];
|
||
for (let y = 0; y < th; y++) {
|
||
let s = ((ty + y) * imgW + tx) * ch;
|
||
for (let x = 0; x < tw; x++, s += ch) {
|
||
const i = y * tw + x;
|
||
if (ch < 3) { for (let c = 0; c < ch; c++) plane[c][i] = px[s + c]; continue; }
|
||
const r = px[s], g = px[s + 1], b = px[s + 2];
|
||
if (t === 0) {
|
||
const oo = (r - b) & 255, tt = (b + (s8(oo) >> 1)) & 255, q = (g - tt) & 255;
|
||
plane[0][i] = (tt + (s8(q) >> 1)) & 255;
|
||
plane[1][i] = (oo + 128) & 255;
|
||
plane[2][i] = (q + 128) & 255;
|
||
} else {
|
||
plane[0][i] = g;
|
||
plane[1][i] = (r - g + 128) & 255;
|
||
plane[2][i] = (b - g + 128) & 255;
|
||
}
|
||
if (ch === 4) plane[3][i] = px[s + 3];
|
||
}
|
||
}
|
||
for (let c = 0; c < ch; c++) {
|
||
const P = plane[c];
|
||
let i = 1;
|
||
while (i < total && P[i] === P[0]) i++;
|
||
if (i === total) { mask[t] |= 1 << c; est[t] += 16; continue; }
|
||
est[t] += chooseFilters(P, tw, th, sc.z[t][c], sc.filt[t][c]);
|
||
}
|
||
}
|
||
const t = tries === 2 && est[1] < est[0] ? 1 : 0;
|
||
o.reserve(5);
|
||
o.buf[o.len++] = mask[t] | (t ? SUBGREEN : 0);
|
||
for (let c = 0; c < ch; c++) if (mask[t] & (1 << c)) o.buf[o.len++] = sc.plane[t][c][0];
|
||
for (let c = 0; c < ch; c++)
|
||
if (!(mask[t] & (1 << c))) emitPlane(o, sc.z[t][c], sc.filt[t][c], tw, th);
|
||
|
||
if (o.len - start > raw + 1) {
|
||
o.len = start;
|
||
o.reserve(raw + 1);
|
||
o.buf[o.len++] = STORED;
|
||
for (let y = 0; y < th; y++) {
|
||
const s = ((ty + y) * imgW + tx) * ch;
|
||
o.buf.set(px.subarray(s, s + tw * ch), o.len);
|
||
o.len += tw * ch;
|
||
}
|
||
}
|
||
}
|
||
|
||
function encodeLevel(px, mw, mh, ch) {
|
||
const tcx = Math.ceil(mw / TILE), tcy = Math.ceil(mh / TILE), tcount = tcx * tcy;
|
||
const o = new Out(tcount * 4 + (mw * mh * ch >> 1));
|
||
o.reserve(tcount * 4);
|
||
o.len = tcount * 4;
|
||
const mk = (n) => [0, 1, 2, 3].map(() => new Uint8Array(n));
|
||
const sc = {
|
||
plane: [mk(TILE_PX), mk(TILE_PX)],
|
||
z: [mk(TILE_PX + GROUP), mk(TILE_PX + GROUP)],
|
||
filt: [mk(TILE / BAND), mk(TILE / BAND)],
|
||
};
|
||
let t = 0;
|
||
for (let ty = 0; ty < tcy; ty++)
|
||
for (let tx = 0; tx < tcx; tx++, t++) {
|
||
const x0 = tx * TILE, y0 = ty * TILE, start = o.len;
|
||
encodeTile(o, sc, px, mw, x0, y0, Math.min(TILE, mw - x0), Math.min(TILE, mh - y0), ch);
|
||
const n = o.len - start;
|
||
o.buf[t * 4] = n & 255; o.buf[t * 4 + 1] = (n >>> 8) & 255;
|
||
o.buf[t * 4 + 2] = (n >>> 16) & 255; o.buf[t * 4 + 3] = (n >>> 24) & 255;
|
||
}
|
||
return o.buf.subarray(0, o.len);
|
||
}
|
||
|
||
function encode(img) {
|
||
const { width: W, height: H, channels: ch } = img;
|
||
const mips = img.mips && img.mips.length ? img.mips : [img.pixels];
|
||
const mipLevels = img.mipLevels || mips.length;
|
||
if (!(W >= 1 && W <= MAX_DIM && H >= 1 && H <= MAX_DIM && ch >= 1 && ch <= 4 &&
|
||
mipLevels >= 1 && mipLevels <= MAX_MIPS && mips.length >= mipLevels))
|
||
throw new Error('YAPF: invalid image');
|
||
const levels = [];
|
||
for (let m = 0; m < mipLevels; m++) {
|
||
const mw = Math.max(1, W >>> m), mh = Math.max(1, H >>> m);
|
||
const px = m === 0 ? img.pixels : mips[m];
|
||
if (!px || px.length < mw * mh * ch) throw new Error('YAPF: mip ' + m + ' has too few pixels');
|
||
levels.push(encodeLevel(px, mw, mh, ch));
|
||
}
|
||
const idxEnd = 20 + 8 * mipLevels;
|
||
let total = idxEnd;
|
||
for (const l of levels) total += l.length;
|
||
const out = new Uint8Array(total);
|
||
out.set([0x59, 0x41, 0x50, 0x46, 1, ch, img.gpuFormat || 0, mipLevels, img.flags || 0]);
|
||
const w32 = (p, v) => { out[p] = v & 255; out[p + 1] = (v >>> 8) & 255;
|
||
out[p + 2] = (v >>> 16) & 255; out[p + 3] = (v >>> 24) & 255; };
|
||
w32(12, W); w32(16, H);
|
||
let off = idxEnd;
|
||
levels.forEach((l, m) => { w32(20 + 8 * m, off); w32(24 + 8 * m, l.length); out.set(l, off); off += l.length; });
|
||
return out;
|
||
}
|
||
|
||
/* Any channel count → RGBA (for canvas ImageData). */
|
||
function toRGBA(img, level) {
|
||
const m = level || 0, px = img.mips ? img.mips[m] : img.pixels;
|
||
const w = Math.max(1, img.width >>> m), h = Math.max(1, img.height >>> m), ch = img.channels;
|
||
if (ch === 4) return new Uint8ClampedArray(px.buffer, px.byteOffset, w * h * 4);
|
||
const out = new Uint8ClampedArray(w * h * 4);
|
||
for (let i = 0, s = 0; i < w * h; i++, s += ch) {
|
||
const o = i * 4;
|
||
if (ch >= 3) { out[o] = px[s]; out[o + 1] = px[s + 1]; out[o + 2] = px[s + 2]; out[o + 3] = 255; }
|
||
else { out[o] = out[o + 1] = out[o + 2] = px[s]; out[o + 3] = ch === 2 ? px[s + 1] : 255; }
|
||
}
|
||
return out;
|
||
}
|
||
|
||
return { decode, encode, toRGBA, GPU, FLAG, VERSION: 1 };
|
||
}));
|