{"versions":{"1.0.1":{"name":"@pdf-lib/upng","license":"MIT","version":"1.0.1","description":"Small, fast and advanced PNG / APNG encoder and decoder","main":"cjs/UPNG.js","unpkg":"dist/UPNG.min.js","module":"UPNG.js","types":"index.d.ts","scripts":{"build":"yarn build:cjs && yarn build:umd && yarn build:umd:min","build:cjs":"babel --plugins @babel/plugin-transform-modules-commonjs --out-dir cjs UPNG.js","build:umd":"rollup --config rollup.config.js --file dist/UPNG.js","build:umd:min":"rollup --config rollup.config.js --file dist/UPNG.min.js --environment MINIFY"},"repository":{"type":"git","url":"https://github.com/Hopding/upng"},"author":{"name":"photopea","url":"https://github.com/photopea"},"contributors":[{"name":"Andrew Dillon","url":"https://github.com/Hopding"},{"name":"Scimonster","url":"https://github.com/Scimonster"}],"bugs":{"url":"https://github.com/Hopding/upng/issues"},"keywords":["png","apng","image","conversion"],"dependencies":{"pako":"^1.0.10"},"devDependencies":{"@babel/cli":"^7.8.4","@babel/core":"^7.8.4","@babel/plugin-transform-modules-commonjs":"^7.8.3","@rollup/plugin-commonjs":"^11.0.0","@rollup/plugin-node-resolve":"^7.1.1","rollup":"^1.31.1","rollup-plugin-terser":"^5.1.3"},"licenseText":"MIT License\n\nCopyright (c) 2017 Photopea\n\nPermission is hereby granted, free of charge, to any person obtaining a copy\nof this software and associated documentation files (the \"Software\"), to deal\nin the Software without restriction, including without limitation the rights\nto use, copy, modify, merge, publish, distribute, sublicense, and/or sell\ncopies of the Software, and to permit persons to whom the Software is\nfurnished to do so, subject to the following conditions:\n\nThe above copyright notice and this permission notice shall be included in all\ncopies or substantial portions of the Software.\n\nTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\nIMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\nFITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\nAUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\nLIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\nOUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\nSOFTWARE.\n","_id":"@pdf-lib/upng@1.0.1","dist":{"shasum":"7dc9c636271aca007a9df4deaf2dd7e7960280cb","size":193826,"noattachment":false,"tarball":"http://123.232.10.234:8212/nexus/content/groups/npm-public/@pdf-lib/upng/-/upng-1.0.1.tgz","integrity":"sha512-dQK2FUMQtowVP00mtIksrlZhdFXQZPC+taih1q4CvPZ5vqdxR/LKBaFg0oAfzd1GlHZXXSPdQfzQnt+ViGvEIQ=="},"maintainers":[{"name":"anonymous","email":"andrew.dillon.j@gmail.com"}],"_npmUser":{"name":"anonymous","email":"andrew.dillon.j@gmail.com"},"directories":{},"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/upng_1.0.1_1582160255936_0.3813650220306337"},"_hasShrinkwrap":false,"publish_time":1582160256125,"_cnpm_publish_time":1582160256125,"_cnpmcore_publish_time":"2021-12-16T12:15:34.957Z"},"1.0.0":{"name":"@pdf-lib/upng","license":"MIT","version":"1.0.0","description":"Small, fast and advanced PNG / APNG encoder and decoder","main":"cjs/UPNG.js","unpkg":"dist/UPNG.min.js","module":"UPNG.js","types":"index.d.ts","scripts":{"build":"yarn build:cjs && yarn build:umd && yarn build:umd:min","build:cjs":"babel --plugins @babel/plugin-transform-modules-commonjs --out-dir cjs UPNG.js","build:umd":"rollup --config rollup.config.js --file dist/UPNG.js","build:umd:min":"rollup --config rollup.config.js --file dist/UPNG.min.js --environment MINIFY"},"repository":{"type":"git","url":"https://github.com/Hopding/upng"},"author":{"name":"photopea","url":"https://github.com/photopea"},"contributors":[{"name":"Andrew Dillon","url":"https://github.com/Hopding"},{"name":"Scimonster","url":"https://github.com/Scimonster"}],"bugs":{"url":"https://github.com/Hopding/upng/issues"},"keywords":["png","apng","image","conversion"],"dependencies":{"pako":"^1.0.5"},"devDependencies":{"@babel/cli":"^7.8.4","@babel/core":"^7.8.4","@babel/plugin-transform-modules-commonjs":"^7.8.3","@rollup/plugin-commonjs":"^11.0.0","@rollup/plugin-node-resolve":"^7.1.1","rollup":"^1.31.1","rollup-plugin-terser":"^5.1.3"},"licenseText":"MIT License\n\nCopyright (c) 2017 Photopea\n\nPermission is hereby granted, free of charge, to any person obtaining a copy\nof this software and associated documentation files (the \"Software\"), to deal\nin the Software without restriction, including without limitation the rights\nto use, copy, modify, merge, publish, distribute, sublicense, and/or sell\ncopies of the Software, and to permit persons to whom the Software is\nfurnished to do so, subject to the following conditions:\n\nThe above copyright notice and this permission notice shall be included in all\ncopies or substantial portions of the Software.\n\nTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\nIMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\nFITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\nAUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\nLIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\nOUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\nSOFTWARE.\n","_id":"@pdf-lib/upng@1.0.0","dist":{"shasum":"31bd109219831f2bfe4566eb11dc475b788d9f39","size":193191,"noattachment":false,"tarball":"http://123.232.10.234:8212/nexus/content/groups/npm-public/@pdf-lib/upng/-/upng-1.0.0.tgz","integrity":"sha512-plI1GngIy8+RtfdLIZcT32byc/lQ7H9KYyRWPrk5SXTC1iSJq4b9+ErOGi9BDnTe19pJlH55bpTY52x8kYFKLw=="},"maintainers":[{"name":"anonymous","email":"andrew.dillon.j@gmail.com"}],"_npmUser":{"name":"anonymous","email":"andrew.dillon.j@gmail.com"},"directories":{},"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/upng_1.0.0_1582159926299_0.6407845904891543"},"_hasShrinkwrap":false,"publish_time":1582159926502,"_cnpm_publish_time":1582159926502,"_cnpmcore_publish_time":"2021-12-16T12:15:35.899Z"}},"dist-tags":{"latest":"1.0.1"},"name":"@pdf-lib/upng","time":{"created":"2022-01-26T23:04:08.248Z","modified":"2023-08-03T18:42:37.557Z","1.0.1":"2020-02-20T00:57:36.125Z","1.0.0":"2020-02-20T00:52:06.502Z"},"readme":"<h1>\n  upng\n\n  <br />\n\n  <!-- NPM Version -->\n  <a href=\"https://www.npmjs.com/package/@pdf-lib/upng\">\n    <img\n      src=\"https://img.shields.io/npm/v/png-ts.svg?style=flat-square\"\n      alt=\"NPM Version\"\n    />\n  </a>\n</h1>\n\n> A small, fast and advanced PNG / APNG encoder and decoder\n\nThis project is a fork of [`UPNG.js`](https://github.com/photopea/UPNG.js) and was created for use in [`pdf-lib`](https://github.com/Hopding/pdf-lib). The maintainer of the original repo does not publish it to NPM. That is the primary purpose of this fork. In addition, an `index.d.ts` file has been added (copied directly from [`@types/upng-js`](https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/upng-js/index.d.ts)) to makes TypeScript definitions available without requiring additional packages to be installed.\n\n## Example of `UPNG.toRGBA8`\n```javascript\n// Import the UPNG class\nimport UPNG from '@pdf-lib/upng';\n\n// Create a UPNG object\nconst pngImage = UPNG.decode(/* Uint8Array containing bytes of PNG image */);\n\n// `pixels` is a 1D array (in rgba order) of decoded pixel data\nconst pixels = pngImage.UPNG.toRGBA8();\n```\n\n## Installation\n### NPM Module\nTo install the latest stable version:\n```bash\n# With npm\nnpm install --save @pdf-lib/upng\n\n# With yarn\nyarn add @pdf-lib/upng\n```\nThis assumes you're using [npm](https://www.npmjs.com/) or [yarn](https://yarnpkg.com/lang/en/) as your package manager.\n\n### UMD Module\nYou can also download `@pdf-lib/upng` as a UMD module from [unpkg](https://unpkg.com/#/). The UMD builds have been compiled to ES5, so they should work [in any modern browser](https://caniuse.com/#feat=es5). UMD builds are useful if you aren't using a package manager or module bundler. For example, you can use them directly in the `<script>` tag of an HTML page.\n\nThe following builds are available:\n\n* https://unpkg.com/@pdf-lib/upng/dist/UPNG.js\n* https://unpkg.com/@pdf-lib/upng/dist/UPNG.min.js\n\nWhen using a UMD build, you will have access to a global `window.UPNG` variable. This variable contains the `UPNG` class exported by `@pdf-lib/upng`. For example:\n\n```javascript\n// NPM module\nimport UPNG from '@pdf-lib/upng';\nconst pngImage = UPNG.decode(/* ... */)\n\n// UMD module\nvar pngImage = window.UPNG.decode(/* ... */)\n```\n\n\n## Encoder\n\nUPNG.js supports APNG and the interface expects \"frames\". Regular PNG is just a single-frame animation (single-item array).\n\n#### `UPNG.encode(imgs, w, h, cnum, [dels])`\n* `imgs`: array of frames. A frame is an ArrayBuffer containing the pixel data (RGBA, 8 bits per channel)\n* `w`, `h` : width and height of the image\n* `cnum`: number of colors in the result;  0: all colors (lossless PNG)\n* `dels`: array of millisecond delays for each frame (only when 2 or more frames)\n* returns an ArrayBuffer with binary data of a PNG file\n\nUPNG.js can do a lossy minification of PNG files, similar to [TinyPNG](https://tinypng.com/) and other tools. It performed quantization with [k-means algorithm](https://en.wikipedia.org/wiki/K-means_clustering) in the past, but now we use [K-d trees](https://en.wikipedia.org/wiki/K-d_tree).\n\nLossy compression is allowed by the last parameter `cnum`. Set it to zero for a lossless compression, or write the number of allowed colors in the image. Smaller values produce smaller files. **Or just use 0 for lossless / 256 for lossy.**\n\n    // Read RGBA from canvas and encode with UPNG\n    var dta = ctx.getImageData(0,0,200,300).data;  // ctx is Context2D of a Canvas\n    //  dta = new Uint8Array(200 * 300 * 4);       // or generate pixels manually\n    var png = UPNG.encode([dta.buffer], 200, 300, 0);   console.log(new Uint8Array(png));\n\n#### `UPNG.encodeLL(imgs, w, h, cc, ac, depth, [dels])` - low-level encode\n* `imgs`: array of frames. A frame is an ArrayBuffer containing the pixel data (corresponding to following parameters)\n* `w`, `h` : width and height of the image\n* `cc`, `ac`: number of color channels (1 or 3) and alpha channels (0 or 1)\n* `depth`: bit depth of pixel data (1, 2, 4, 8, 16)\n* `dels`: array of millisecond delays for each frame (only when 2 or more frames)\n* returns an ArrayBuffer with binary data of a PNG file\n\nThis function does not do any optimizations, it just stores what you give it. There are two cases when it is useful:\n* saving 16-bit colors (note, that PNG is big-endian, unlike Uint16Array in JS)\n* your image is too large, and \"expanding\" to 8-bit RGBA would use too much memory (e.g. 4-bit grayscale 50,000 x 50,000 = 1.25 GB, 8-bit RGBA would be 10 GB)\n\n## Decoder\n\nSupports all color types (including Grayscale and Palettes), all channel depths (1, 2, 4, 8, 16), interlaced images etc. Opens PNGs which other libraries can not open (tested with [PngSuite](http://www.schaik.com/pngsuite/)).\n\n#### `UPNG.decode(buffer)`\n* `buffer`: ArrayBuffer containing the PNG file\n* returns an image object with following properties:\n* * `width`: the width of the image\n* * `height`: the height of the image\n* * `depth`: number of bits per channel\n* * `ctype`: color type of the file (Truecolor, Grayscale, Palette ...)\n* * `frames`: additional info about frames (frame delays etc.)\n* * `tabs`: additional chunks of the PNG file\n* * `data`: pixel data of the image\n\nPNG files may have a various number of channels and a various color depth. The interpretation of `data` depends on the current color type and color depth (see the [PNG specification](https://www.w3.org/TR/PNG/)).\n\n#### `UPNG.toRGBA8(img)`\n* `img`: PNG image object (returned by UPNG.decode())\n* returns an array of frames. A frame is ArrayBuffer of the image in RGBA format, 8 bits per channel.\n\n### Example\n    var img  = UPNG.decode(buff);        // put ArrayBuffer of the PNG file into UPNG.decode\n    var rgba = UPNG.toRGBA8(img)[0];     // UPNG.toRGBA8 returns array of frames, size: width * height * 4 bytes.\n\nPNG format uses the Inflate algorithm. Right now, UPNG.js calls [Pako.js](https://github.com/nodeca/pako) for the Inflate and Deflate method.\n\n## Quantizer\n\nUPNG.js contains a very good Quantizer of 4-component 8-bit vectors (i.e. pixels). It can be used to generate nice color palettes (e.g. Photopea uses UPNG.js to make palettes for GIF images).\n\nQuantization consists of two important steps: Finding a nice palette and Finding the closest color in the palette for each sample (non-trivial for large palettes). UPNG perfroms both steps.\n\n    var res  = UPNG.quantize(data, psize);\n\n* `data`: ArrayBuffer of samples (byte length is a multiple of four)\n* `psize` : Palette size (how many colors you want to have)\n\nThe result object \"res\" has following properties:\n\n* `abuf`: ArrayBuffer corresponding to `data`, where colors are remapped by a palette\n* `inds`: Uint8Array : the index of a color for each sample (only when `psize`<=256)\n* `plte`: Array : the Palette - a list of colors, `plte[i].est.q` and `plte[i].est.rgba` is the color value\n\n### FAQ\n\n- To get one common palette for multiple images (e.g. frames of the animation), concatenate them into one array `data`.\n- When working with less than four components, set the remaining components to a constant value (e.g. to zero)\n- When working with transparency, premultiply color components by transparency (otherwise, rgba(1,1,1,0) would be closer to rgba(1,1,1,1) than to rgba(0,0,0,0) - transparent mapped to white instead of transparent)","users":{}}