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Filename : stats.cc
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// Copyright 2013 Lovell Fuller and others.
// SPDX-License-Identifier: Apache-2.0

#include <numeric>
#include <vector>
#include <iostream>

#include <napi.h>
#include <vips/vips8>

#include "common.h"
#include "stats.h"

class StatsWorker : public Napi::AsyncWorker {
 public:
  StatsWorker(Napi::Function callback, StatsBaton *baton, Napi::Function debuglog) :
    Napi::AsyncWorker(callback), baton(baton), debuglog(Napi::Persistent(debuglog)) {}
  ~StatsWorker() {}

  const int STAT_MIN_INDEX = 0;
  const int STAT_MAX_INDEX = 1;
  const int STAT_SUM_INDEX = 2;
  const int STAT_SQ_SUM_INDEX = 3;
  const int STAT_MEAN_INDEX = 4;
  const int STAT_STDEV_INDEX = 5;
  const int STAT_MINX_INDEX = 6;
  const int STAT_MINY_INDEX = 7;
  const int STAT_MAXX_INDEX = 8;
  const int STAT_MAXY_INDEX = 9;

  void Execute() {
    // Decrement queued task counter
    g_atomic_int_dec_and_test(&sharp::counterQueue);

    vips::VImage image;
    sharp::ImageType imageType = sharp::ImageType::UNKNOWN;
    try {
      std::tie(image, imageType) = OpenInput(baton->input);
    } catch (vips::VError const &err) {
      (baton->err).append(err.what());
    }
    if (imageType != sharp::ImageType::UNKNOWN) {
      try {
        vips::VImage stats = image.stats();
        int const bands = image.bands();
        for (int b = 1; b <= bands; b++) {
          ChannelStats cStats(
            static_cast<int>(stats.getpoint(STAT_MIN_INDEX, b).front()),
            static_cast<int>(stats.getpoint(STAT_MAX_INDEX, b).front()),
            stats.getpoint(STAT_SUM_INDEX, b).front(),
            stats.getpoint(STAT_SQ_SUM_INDEX, b).front(),
            stats.getpoint(STAT_MEAN_INDEX, b).front(),
            stats.getpoint(STAT_STDEV_INDEX, b).front(),
            static_cast<int>(stats.getpoint(STAT_MINX_INDEX, b).front()),
            static_cast<int>(stats.getpoint(STAT_MINY_INDEX, b).front()),
            static_cast<int>(stats.getpoint(STAT_MAXX_INDEX, b).front()),
            static_cast<int>(stats.getpoint(STAT_MAXY_INDEX, b).front()));
          baton->channelStats.push_back(cStats);
        }
        // Image is not opaque when alpha layer is present and contains a non-mamixa value
        if (sharp::HasAlpha(image)) {
          double const minAlpha = static_cast<double>(stats.getpoint(STAT_MIN_INDEX, bands).front());
          if (minAlpha != sharp::MaximumImageAlpha(image.interpretation())) {
            baton->isOpaque = false;
          }
        }
        // Convert to greyscale
        vips::VImage greyscale = image.colourspace(VIPS_INTERPRETATION_B_W)[0];
        // Estimate entropy via histogram of greyscale value frequency
        baton->entropy = std::abs(greyscale.hist_find().hist_entropy());
        // Estimate sharpness via standard deviation of greyscale laplacian
        if (image.width() > 1 || image.height() > 1) {
          VImage laplacian = VImage::new_matrixv(3, 3,
            0.0,  1.0, 0.0,
            1.0, -4.0, 1.0,
            0.0,  1.0, 0.0);
          laplacian.set("scale", 9.0);
          baton->sharpness = greyscale.conv(laplacian).deviate();
        }
        // Most dominant sRGB colour via 4096-bin 3D histogram
        vips::VImage hist = sharp::RemoveAlpha(image)
          .colourspace(VIPS_INTERPRETATION_sRGB)
          .hist_find_ndim(VImage::option()->set("bins", 16));
        std::complex<double> maxpos = hist.maxpos();
        int const dx = static_cast<int>(std::real(maxpos));
        int const dy = static_cast<int>(std::imag(maxpos));
        std::vector<double> pel = hist(dx, dy);
        int const dz = std::distance(pel.begin(), std::find(pel.begin(), pel.end(), hist.max()));
        baton->dominantRed = dx * 16 + 8;
        baton->dominantGreen = dy * 16 + 8;
        baton->dominantBlue = dz * 16 + 8;
      } catch (vips::VError const &err) {
        (baton->err).append(err.what());
      }
    }

    // Clean up
    vips_error_clear();
    vips_thread_shutdown();
  }

  void OnOK() {
    Napi::Env env = Env();
    Napi::HandleScope scope(env);

    // Handle warnings
    std::string warning = sharp::VipsWarningPop();
    while (!warning.empty()) {
      debuglog.MakeCallback(Receiver().Value(), { Napi::String::New(env, warning) });
      warning = sharp::VipsWarningPop();
    }

    if (baton->err.empty()) {
      // Stats Object
      Napi::Object info = Napi::Object::New(env);
      Napi::Array channels = Napi::Array::New(env);

      std::vector<ChannelStats>::iterator it;
      int i = 0;
      for (it = baton->channelStats.begin(); it < baton->channelStats.end(); it++, i++) {
        Napi::Object channelStat = Napi::Object::New(env);
        channelStat.Set("min", it->min);
        channelStat.Set("max", it->max);
        channelStat.Set("sum", it->sum);
        channelStat.Set("squaresSum", it->squaresSum);
        channelStat.Set("mean", it->mean);
        channelStat.Set("stdev", it->stdev);
        channelStat.Set("minX", it->minX);
        channelStat.Set("minY", it->minY);
        channelStat.Set("maxX", it->maxX);
        channelStat.Set("maxY", it->maxY);
        channels.Set(i, channelStat);
      }

      info.Set("channels", channels);
      info.Set("isOpaque", baton->isOpaque);
      info.Set("entropy", baton->entropy);
      info.Set("sharpness", baton->sharpness);
      Napi::Object dominant = Napi::Object::New(env);
      dominant.Set("r", baton->dominantRed);
      dominant.Set("g", baton->dominantGreen);
      dominant.Set("b", baton->dominantBlue);
      info.Set("dominant", dominant);
      Callback().MakeCallback(Receiver().Value(), { env.Null(), info });
    } else {
      Callback().MakeCallback(Receiver().Value(), { Napi::Error::New(env, sharp::TrimEnd(baton->err)).Value() });
    }

    delete baton->input;
    delete baton;
  }

 private:
  StatsBaton* baton;
  Napi::FunctionReference debuglog;
};

/*
  stats(options, callback)
*/
Napi::Value stats(const Napi::CallbackInfo& info) {
  // V8 objects are converted to non-V8 types held in the baton struct
  StatsBaton *baton = new StatsBaton;
  Napi::Object options = info[size_t(0)].As<Napi::Object>();

  // Input
  baton->input = sharp::CreateInputDescriptor(options.Get("input").As<Napi::Object>());
  baton->input->access = VIPS_ACCESS_RANDOM;

  // Function to notify of libvips warnings
  Napi::Function debuglog = options.Get("debuglog").As<Napi::Function>();

  // Join queue for worker thread
  Napi::Function callback = info[size_t(1)].As<Napi::Function>();
  StatsWorker *worker = new StatsWorker(callback, baton, debuglog);
  worker->Receiver().Set("options", options);
  worker->Queue();

  // Increment queued task counter
  g_atomic_int_inc(&sharp::counterQueue);

  return info.Env().Undefined();
}