mrmBot-Matrix/natives/uncanny.cc

#include <vips/vips8>

#include "common.h"

using namespace std;
using namespace vips;

char *Uncanny(string type, string *outType, char *BufferData,
              size_t BufferLength, ArgumentMap Arguments, size_t *DataSize) {
  string caption = GetArgument<string>(Arguments, "caption");
  string caption2 = GetArgument<string>(Arguments, "caption2");
  string font = GetArgument<string>(Arguments, "font");
  string path = GetArgument<string>(Arguments, "path");
  string basePath = GetArgument<string>(Arguments, "basePath");

  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)
          .extract_band(0, VImage::option()->set("n", 3));

  VImage base = VImage::black(1280, 720, VImage::option()->set("bands", 3));

  string font_string = (font == "roboto" ? "Roboto Condensed" : font) +
                       ", Twemoji Color Font " +
                       (font != "impact" ? "bold" : "normal") + " 72";

  string captionText =
      "<span background=\"black\" foreground=\"white\">" + caption + "</span>";
  string caption2Text =
      "<span background=\"black\" foreground=\"red\">" + caption2 + "</span>";

  auto findResult = fontPaths.find(font);
  if (findResult != fontPaths.end()) {
    VImage::text(".", VImage::option()->set(
                          "fontfile", (basePath + findResult->second).c_str()));
  }

  VImage text = VImage::text(
      captionText.c_str(),
      VImage::option()
          ->set("rgba", true)
          ->set("align", VIPS_ALIGN_CENTRE)
          ->set("font", font_string.c_str())
          ->set("fontfile", (basePath + "assets/fonts/twemoji.otf").c_str())
          ->set("width", 588)
          ->set("height", 90));
  VImage captionImage =
      text.extract_band(0, VImage::option()->set("n", 3))
          .gravity(VIPS_COMPASS_DIRECTION_CENTRE, 640, text.height() + 40,
                   VImage::option()->set("extend", "black"));

  VImage text2 = VImage::text(
      caption2Text.c_str(),
      VImage::option()
          ->set("rgba", true)
          ->set("align", VIPS_ALIGN_CENTRE)
          ->set("font", font_string.c_str())
          ->set("fontfile", (basePath + "assets/fonts/twemoji.otf").c_str())
          ->set("width", 588)
          ->set("height", 90));
  VImage caption2Image =
      text2.extract_band(0, VImage::option()->set("n", 3))
          .gravity(VIPS_COMPASS_DIRECTION_CENTRE, 640, text.height() + 40,
                   VImage::option()->set("extend", "black"));

  base = base.insert(captionImage, 0, 0).insert(caption2Image, 640, 0);

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

  VImage uncanny = VImage::new_from_file((basePath + path).c_str());

  base = base.insert(uncanny, 0, 130);

  vector<VImage> img;
  for (int i = 0; i < nPages; i++) {
    VImage img_frame =
        type == "gif" ? in.crop(0, i * pageHeight, width, pageHeight) : in;
    VImage resized = img_frame.resize(690.0 / (double)width);
    if (resized.height() > 590) {
      double vscale = 590.0 / (double)resized.height();
      resized = resized.resize(vscale, VImage::option()->set("vscale", vscale));
    }
    VImage composited = base.insert(resized, 935 - (resized.width() / 2),
                                    425 - (resized.height() / 2));
    img.push_back(composited);
  }
  VImage final = VImage::arrayjoin(img, VImage::option()->set("across", 1));
  final.set(VIPS_META_PAGE_HEIGHT, 720);

  void *buf;
  final.write_to_buffer(
      ("." + *outType).c_str(), &buf, DataSize,
      *outType == "gif" ? VImage::option()->set("reoptimise", 1) : 0);

  return (char *)buf;
}