mrmBot-Matrix/natives/deepfry.cc

#include <map>
#include <vips/vips8>

#include "common.h"

using namespace std;
using namespace vips;

ArgumentMap Deepfry(string type, string *outType, char *BufferData,
              size_t BufferLength, [[maybe_unused]] ArgumentMap Arguments,
              size_t *DataSize) {
  VOption *options = VImage::option()->set("access", "sequential");

  VImage in =
      VImage::new_from_buffer(BufferData, BufferLength, "",
                              type == "gif" ? options->set("n", -1) : options)
          .colourspace(VIPS_INTERPRETATION_sRGB);

  if (!in.has_alpha()) in = in.bandjoin(255);

  int width = in.width();
  int pageHeight = vips_image_get_page_height(in.get_image());
  int totalHeight = in.height();
  int nPages = vips_image_get_n_pages(in.get_image());

  VImage fried = (in * 1.3 - (255.0 * 1.3 - 255.0)) * 1.5;

  VImage final;
  if (totalHeight > 65500 && type == "gif") {
    vector<VImage> img;
    for (int i = 0; i < nPages; i++) {
      VImage img_frame = in.crop(0, i * pageHeight, width, pageHeight);
      void *jpgBuf;
      size_t jpgLength;
      img_frame.write_to_buffer(
          ".jpg", &jpgBuf, &jpgLength,
          VImage::option()->set("Q", 1)->set("strip", true));
      VImage jpeged = VImage::new_from_buffer(jpgBuf, jpgLength, "");
      jpeged.set(VIPS_META_PAGE_HEIGHT, pageHeight);
      jpeged.set("delay", in.get_array_int("delay"));
      img.push_back(jpeged);
    }
    final = VImage::arrayjoin(img, VImage::option()->set("across", 1));
    final.set(VIPS_META_PAGE_HEIGHT, pageHeight);
  } else {
    void *jpgBuf;
    size_t jpgLength;
    fried.write_to_buffer(".jpg", &jpgBuf, &jpgLength,
                          VImage::option()->set("Q", 1)->set("strip", true));
    final = VImage::new_from_buffer(jpgBuf, jpgLength, "");
    final.set(VIPS_META_PAGE_HEIGHT, pageHeight);
    if (type == "gif") final.set("delay", fried.get_array_int("delay"));
  }

  void *buf;
  final.write_to_buffer(
      ("." + *outType).c_str(), &buf, DataSize,
      *outType == "gif" ? VImage::option()->set("dither", 0) : 0);

  ArgumentMap output;
  output["buf"] = (char *)buf;
  output["width"] = width;
  output["height"] = pageHeight;

  return output;
}