react-native-svg-app-icon/lib/output.js

App icon generator for React Native projects

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.ensureFileContents = ensureFileContents;
exports.genaratePngs = genaratePngs;

var fse = _interopRequireWildcard(require("fs-extra"));

var path = _interopRequireWildcard(require("path"));

var input = _interopRequireWildcard(require("./input"));

function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function (nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }

function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }

async function* genaratePngs(fileInput, outputs) {
  for (const output of outputs) {
    yield* genaratePng(fileInput, output);
  }
}

async function* genaratePng(fileInput, output) {
  if (!(output.force || (await hasChanged(fileInput, output)))) {
    return;
  }

  const {
    sharp,
    baseImage,
    operations = []
  } = await fileInput.read();
  const metadata = baseImage.metadata;
  await fse.ensureDir(path.dirname(output.filePath));
  const scale = fileInput.cropSize === undefined ? 1 : input.inputImageSize / fileInput.cropSize;
  const targetDensity = output.outputSize / metadata.width * metadata.density * scale;
  let image = sharp(baseImage.data, {
    density: targetDensity
  });

  for (const operation of operations) {
    switch (operation.type) {
      case "composite":
        {
          let blend;

          switch (operation.blend) {
            case "overlay":
              blend = "over";
              break;

            case "mask":
              blend = "dest-in";
              break;

            default:
              blend = "over";
          }

          image = sharp(await image.composite([{
            input: await sharp(operation.file, {
              density: targetDensity
            }).toBuffer(),
            blend: blend
          }]).toBuffer());
          break;
        }

      case "remove-alpha":
        image = image.removeAlpha();
        break;
    }
  }

  const extractRegion = getExtractRegion(targetDensity, metadata, output.outputSize);
  image = image.extract(extractRegion);
  await image.png({
    adaptiveFiltering: false,
    compressionLevel: 9
  }).toFile(output.filePath);
  yield output.filePath;
}

function getExtractRegion(targetDensity, metadata, outputSize) {
  const imageMargin = Math.floor((targetDensity / metadata.density * metadata.width - outputSize) / 2);
  return {
    top: imageMargin,
    left: imageMargin,
    width: outputSize,
    height: outputSize
  };
}

async function hasChanged(input, output) {
  let outputStat;

  try {
    outputStat = await fse.stat(output.filePath);
  } catch {
    return true;
  }

  if (input.lastModified > outputStat.mtimeMs) {
    return true;
  } else {
    return false;
  }
}

async function* ensureFileContents(path, content, config) {
  let stringContent;

  switch (typeof content) {
    case "object":
      stringContent = JSON.stringify(content, undefined, 2);
      break;

    case "string":
      stringContent = content;
      break;

    default:
      throw Error("Invalid content");
  }

  const contentBuffer = Buffer.from(stringContent, "utf-8");

  if (!config.force && (await hasFileContent(path, contentBuffer))) {
    return;
  } else {
    await fse.outputFile(path, contentBuffer);
    yield path;
  }
}

async function hasFileContent(path, contentBuffer) {
  try {
    const diskFileBuffer = await fse.readFile(path);
    return diskFileBuffer.equals(contentBuffer);
  } catch {
    return false;
  }
}