?HAMA

Navigation

Breadcrumbs

/ / home / byroehnu / .trash / node_modules11 / pngjs / lib

Create

Create File | Create Folder | Upload Files | Run Command

Edit File Size: 6.33 KB

/home/byroehnu/.trash/node_modules11/pngjs/lib/bitmapper.js

Text Base64

"use strict";

let interlaceUtils = require("./interlace");

let pixelBppMapper = [
  // 0 - dummy entry
  function () {},

// 1 - L
  // 0: 0, 1: 0, 2: 0, 3: 0xff
  function (pxData, data, pxPos, rawPos) {
    if (rawPos === data.length) {
      throw new Error("Ran out of data");
    }

let pixel = data[rawPos];
    pxData[pxPos] = pixel;
    pxData[pxPos + 1] = pixel;
    pxData[pxPos + 2] = pixel;
    pxData[pxPos + 3] = 0xff;
  },

// 2 - LA
  // 0: 0, 1: 0, 2: 0, 3: 1
  function (pxData, data, pxPos, rawPos) {
    if (rawPos + 1 >= data.length) {
      throw new Error("Ran out of data");
    }

let pixel = data[rawPos];
    pxData[pxPos] = pixel;
    pxData[pxPos + 1] = pixel;
    pxData[pxPos + 2] = pixel;
    pxData[pxPos + 3] = data[rawPos + 1];
  },

// 3 - RGB
  // 0: 0, 1: 1, 2: 2, 3: 0xff
  function (pxData, data, pxPos, rawPos) {
    if (rawPos + 2 >= data.length) {
      throw new Error("Ran out of data");
    }

pxData[pxPos] = data[rawPos];
    pxData[pxPos + 1] = data[rawPos + 1];
    pxData[pxPos + 2] = data[rawPos + 2];
    pxData[pxPos + 3] = 0xff;
  },

// 4 - RGBA
  // 0: 0, 1: 1, 2: 2, 3: 3
  function (pxData, data, pxPos, rawPos) {
    if (rawPos + 3 >= data.length) {
      throw new Error("Ran out of data");
    }

pxData[pxPos] = data[rawPos];
    pxData[pxPos + 1] = data[rawPos + 1];
    pxData[pxPos + 2] = data[rawPos + 2];
    pxData[pxPos + 3] = data[rawPos + 3];
  },
];

let pixelBppCustomMapper = [
  // 0 - dummy entry
  function () {},

// 1 - L
  // 0: 0, 1: 0, 2: 0, 3: 0xff
  function (pxData, pixelData, pxPos, maxBit) {
    let pixel = pixelData[0];
    pxData[pxPos] = pixel;
    pxData[pxPos + 1] = pixel;
    pxData[pxPos + 2] = pixel;
    pxData[pxPos + 3] = maxBit;
  },

// 2 - LA
  // 0: 0, 1: 0, 2: 0, 3: 1
  function (pxData, pixelData, pxPos) {
    let pixel = pixelData[0];
    pxData[pxPos] = pixel;
    pxData[pxPos + 1] = pixel;
    pxData[pxPos + 2] = pixel;
    pxData[pxPos + 3] = pixelData[1];
  },

// 3 - RGB
  // 0: 0, 1: 1, 2: 2, 3: 0xff
  function (pxData, pixelData, pxPos, maxBit) {
    pxData[pxPos] = pixelData[0];
    pxData[pxPos + 1] = pixelData[1];
    pxData[pxPos + 2] = pixelData[2];
    pxData[pxPos + 3] = maxBit;
  },

// 4 - RGBA
  // 0: 0, 1: 1, 2: 2, 3: 3
  function (pxData, pixelData, pxPos) {
    pxData[pxPos] = pixelData[0];
    pxData[pxPos + 1] = pixelData[1];
    pxData[pxPos + 2] = pixelData[2];
    pxData[pxPos + 3] = pixelData[3];
  },
];

function bitRetriever(data, depth) {
  let leftOver = [];
  let i = 0;

return {
    get: function (count) {
      while (leftOver.length < count) {
        split();
      }
      let returner = leftOver.slice(0, count);
      leftOver = leftOver.slice(count);
      return returner;
    },
    resetAfterLine: function () {
      leftOver.length = 0;
    },
    end: function () {
      if (i !== data.length) {
        throw new Error("extra data found");
      }
    },
  };
}

exports.dataToBitMap = function (data, bitmapInfo) {
  let width = bitmapInfo.width;
  let height = bitmapInfo.height;
  let depth = bitmapInfo.depth;
  let bpp = bitmapInfo.bpp;
  let interlace = bitmapInfo.interlace;
  let bits;

if (depth !== 8) {
    bits = bitRetriever(data, depth);
  }
  let pxData;
  if (depth <= 8) {
    pxData = Buffer.alloc(width * height * 4);
  } else {
    pxData = new Uint16Array(width * height * 4);
  }
  let maxBit = Math.pow(2, depth) - 1;
  let rawPos = 0;
  let images;
  let getPxPos;

if (interlace) {
    images = interlaceUtils.getImagePasses(width, height);
    getPxPos = interlaceUtils.getInterlaceIterator(width, height);
  } else {
    let nonInterlacedPxPos = 0;
    getPxPos = function () {
      let returner = nonInterlacedPxPos;
      nonInterlacedPxPos += 4;
      return returner;
    };
    images = [{ width: width, height: height }];
  }

for (let imageIndex = 0; imageIndex < images.length; imageIndex++) {
    if (depth === 8) {
      rawPos = mapImage8Bit(
        images[imageIndex],
        pxData,
        getPxPos,
        bpp,
        data,
        rawPos
      );
    } else {
      mapImageCustomBit(
        images[imageIndex],
        pxData,
        getPxPos,
        bpp,
        bits,
        maxBit
      );
    }
  }
  if (depth === 8) {
    if (rawPos !== data.length) {
      throw new Error("extra data found");
    }
  } else {
    bits.end();
  }

return pxData;
};

Exit & Reset Text mode: syntax highlighting auto-detects file type.

Directory Contents

Dirs: 0 × Files: 22

Sort:

Enable drag-to-move

Name	Size	Perms	Modified	Actions
bitmapper.js	6.33 KB	lrw-r--r--	2026-02-27 09:45:00	Edit Download recursive recursive
bitpacker.js	4.56 KB	lrw-r--r--	2026-02-27 09:45:00	Edit Download recursive recursive
chunkstream.js	4.15 KB	lrw-r--r--	2026-02-27 09:45:02	Edit Download recursive recursive
constants.js	662 B	lrw-r--r--	2026-02-27 09:45:02	Edit Download recursive recursive
crc.js	853 B	lrw-r--r--	2026-02-27 09:45:02	Edit Download recursive recursive
filter-pack.js	4.18 KB	lrw-r--r--	2026-02-27 09:45:02	Edit Download recursive recursive
filter-parse-async.js	558 B	lrw-r--r--	2026-02-27 09:45:02	Edit Download recursive recursive
filter-parse-sync.js	483 B	lrw-r--r--	2026-02-27 09:45:04	Edit Download recursive recursive
filter-parse.js	4.69 KB	lrw-r--r--	2026-02-27 09:45:04	Edit Download recursive recursive
format-normaliser.js	2.27 KB	lrw-r--r--	2026-02-27 09:45:04	Edit Download recursive recursive
interlace.js	1.96 KB	lrw-r--r--	2026-02-27 09:45:04	Edit Download recursive recursive
packer-async.js	1.13 KB	lrw-r--r--	2026-02-27 09:45:04	Edit Download recursive recursive
packer-sync.js	1.17 KB	lrw-r--r--	2026-02-27 09:45:04	Edit Download recursive recursive
packer.js	3.64 KB	lrw-r--r--	2026-02-27 09:45:04	Edit Download recursive recursive
paeth-predictor.js	372 B	lrw-r--r--	2026-02-27 09:45:04	Edit Download recursive recursive
parser-async.js	4.22 KB	lrw-r--r--	2026-02-27 09:45:04	Edit Download recursive recursive
parser-sync.js	2.48 KB	lrw-r--r--	2026-02-27 09:45:04	Edit Download recursive recursive
parser.js	7.54 KB	lrw-r--r--	2026-02-27 09:45:04	Edit Download recursive recursive
png-sync.js	252 B	lrw-r--r--	2026-02-27 09:45:04	Edit Download recursive recursive
png.js	4.31 KB	lrw-r--r--	2026-02-27 09:45:04	Edit Download recursive recursive
sync-inflate.js	3.66 KB	lrw-r--r--	2026-02-27 09:45:04	Edit Download recursive recursive
sync-reader.js	1.09 KB	lrw-r--r--	2026-02-27 09:45:04	Edit Download recursive recursive