buildImage method

Implementation

@override
PdfImage buildImage(Context context, {int? width, int? height}) {
  if (width == null) {
    return PdfImage.file(context.document, bytes: bytes);
  }

  final image = im.decodeImage(bytes);

  if (image == null) {
    throw PdfException('Unable decode the image');
  }

  // The decoded (orientation-baked) pixels are the ground truth for the
  // no-upscale rule: for rotated images the metadata bound checked by
  // resolve() cannot know which axis copyResize will scale.
  if (width >= image.width) {
    return PdfImage.file(context.document, bytes: bytes);
  }

  final resized = im.copyResize(image, width: width);

  if (im.JpegDecoder().isValidFile(bytes)) {
    // Do not carry the source metadata over: EXIF can hold sensitive data
    // (GPS position, device serial numbers) and its orientation is already
    // baked into the decoded pixels.
    resized.exif = im.ExifData();

    // Keep DCT (JPEG) encoding for resampled JPEG images: embedding the
    // raw pixels with Flate compression would inflate the file size.
    return PdfImage.jpeg(
      context.document,
      image: im.encodeJpg(resized, quality: 90),
    );
  }

  return PdfImage.fromImage(context.document, image: resized);
}