mrmBot-Matrix/natives/deepfry.cc

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

using namespace std;
using namespace vips;

char* Deepfry(string type, char* BufferData, size_t BufferLength, map<string, string> 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(("." + type).c_str(), &buf, DataSize,
                          type == "gif" ? VImage::option()->set("dither", 0)
                                        : 0);

	vips_error_clear();
	vips_thread_shutdown();

	return (char*) buf;
}