convertToWebp static method

Future<void> convertToWebp(File input, File output, { int? maxBytes, int? maxDim, bool? lossless, int? quality, int? progressivePartitions, int? alphaQuality, int? compressiveStrength, bool? alphaCompression, })

Implementation

static Future<void> convertToWebp(File input, File output,
    {
    /// Maximum size of the output image in bytes.
    /// This is a target size, the actual size may vary
    /// depending on the webp library used this may not work. (doesnt seem to work on windows)
    int? maxBytes,

    /// Maximum dimension of the output image maintaining aspect ratio.
    /// Will only shrink the image, not enlarge it.
    int? maxDim,

    /// true or false defaults to false
    bool? lossless,

    /// 0 to 100
    int? quality,

    /// 0 to 3 for how many progressive segments to use
    int? progressivePartitions,

    /// 0 to 100 defaults to 100
    int? alphaQuality,

    /// 0 (fast) to 6 (best) defaults to 4
    int? compressiveStrength,

    /// true or false
    bool? alphaCompression}) async {
  Process p = await Process.start("magick", [
    input.path,
    if (maxDim != null) ...["-resize", "${maxDim}x$maxDim>"],
    if (maxBytes != null) ...["-define", "webp:target-size=$maxBytes"],
    if (lossless != null) ...["-define", "webp:lossless=$lossless"],
    if (compressiveStrength != null) ...[
      "-define",
      "webp:method=$compressiveStrength"
    ],
    if (progressivePartitions != null) ...[
      "-define",
      "webp:partitions=$progressivePartitions"
    ],
    if (alphaCompression != null) ...[
      "-define",
      "webp:alpha-compression=${alphaCompression ? 1 : 0}"
    ],
    if (alphaQuality != null) ...[
      "-define",
      "webp:alpha-quality=$alphaQuality"
    ],
    if (quality != null) ...["-quality", quality.toString()],
    "-format",
    "webp",
    output.path
  ]);
  p.stdout.pipe(stdout);
  p.stderr.pipe(stderr);
  int exitCode = await p.exitCode;
  print("Magick exit code: $exitCode");

  if (exitCode != 0) {
    throw Exception("ImageMagick command failed with exit code $exitCode");
  }
}