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85 lines
2.4 KiB
JavaScript
85 lines
2.4 KiB
JavaScript
/* Copyright 2025 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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class QCMS {
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static #memoryArray = null;
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static _memory = null;
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static _mustAddAlpha = false;
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static _destBuffer = null;
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static _destOffset = 0;
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static _destLength = 0;
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static _cssColor = "";
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static _makeHexColor = null;
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static get _memoryArray() {
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const array = this.#memoryArray;
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if (array?.byteLength) {
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return array;
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}
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return (this.#memoryArray = new Uint8Array(this._memory.buffer));
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}
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}
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function copy_result(ptr, len) {
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// This function is called from the wasm module (it's an external
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// "C" function). Its goal is to copy the result from the wasm memory
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// to the destination buffer without any intermediate copies.
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const { _mustAddAlpha, _destBuffer, _destOffset, _destLength, _memoryArray } =
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QCMS;
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if (len === _destLength) {
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_destBuffer.set(_memoryArray.subarray(ptr, ptr + len), _destOffset);
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return;
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}
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if (_mustAddAlpha) {
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for (let i = ptr, ii = ptr + len, j = _destOffset; i < ii; i += 3, j += 4) {
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_destBuffer[j] = _memoryArray[i];
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_destBuffer[j + 1] = _memoryArray[i + 1];
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_destBuffer[j + 2] = _memoryArray[i + 2];
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_destBuffer[j + 3] = 255;
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}
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} else {
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for (let i = ptr, ii = ptr + len, j = _destOffset; i < ii; i += 3, j += 4) {
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_destBuffer[j] = _memoryArray[i];
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_destBuffer[j + 1] = _memoryArray[i + 1];
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_destBuffer[j + 2] = _memoryArray[i + 2];
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}
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}
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}
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function copy_rgb(ptr) {
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const { _destBuffer, _destOffset, _memoryArray } = QCMS;
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_destBuffer[_destOffset] = _memoryArray[ptr];
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_destBuffer[_destOffset + 1] = _memoryArray[ptr + 1];
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_destBuffer[_destOffset + 2] = _memoryArray[ptr + 2];
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}
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function make_cssRGB(ptr) {
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const { _memoryArray } = QCMS;
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QCMS._cssColor = QCMS._makeHexColor(
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_memoryArray[ptr],
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_memoryArray[ptr + 1],
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_memoryArray[ptr + 2]
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);
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}
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export { copy_result, copy_rgb, make_cssRGB, QCMS };
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