From d70aaf0ef92cac0781dabb60411bbd907e7f0caa Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@gmail.com>
Date: Wed, 10 Feb 2021 15:43:01 +0100
Subject: wallpaper: calculate average color

---
 src/wanda/wallpaper.cpp | 72 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)

(limited to 'src/wanda')

diff --git a/src/wanda/wallpaper.cpp b/src/wanda/wallpaper.cpp
index 3fc93b3..7d4c7d5 100644
--- a/src/wanda/wallpaper.cpp
+++ b/src/wanda/wallpaper.cpp
@@ -1,17 +1,89 @@
 #include <wanda/logging.hpp>
+#include <wanda/magic.hpp>
 #include <wanda/optional.hpp>
 #include <wanda/setting.hpp>
 #include <wanda/wallpaper.hpp>
 
+#include <boost/gil.hpp>
+#include <boost/gil/extension/io/jpeg.hpp>
+#include <boost/gil/extension/io/png.hpp>
+#include <boost/gil/extension/numeric/resample.hpp>
+#include <boost/gil/extension/numeric/sampler.hpp>
+
+#include <fmt/format.h>
+
+#include <algorithm>
+#include <cmath>
+#include <memory>
+
 namespace wanda
 {
+  namespace
+  {
+    auto magic_instance = magic{};
+
+    auto load_image(std::filesystem::path wallpaper)
+    {
+      auto image = boost::gil::rgb8_image_t{};
+
+      switch (magic_instance.type(wallpaper))
+      {
+        case magic::mime_type::image_jpeg:
+          boost::gil::read_and_convert_image(wallpaper.native(), image, boost::gil::jpeg_tag{});
+          break;
+        case magic::mime_type::image_png:
+          boost::gil::read_and_convert_image(wallpaper.native(), image, boost::gil::png_tag{});
+          break;
+      }
+
+      return image;
+
+      // // auto source_view = ;
+
+      // return fmt::format("#{:02X}{:02X}{:02X}",
+      //                    static_cast<uint8_t>(std::sqrt((at_c<0>(pixel64) / image.size()))),
+      //                    static_cast<uint8_t>(std::sqrt((at_c<1>(pixel64) / image.size()))),
+      //                    static_cast<uint8_t>(std::sqrt((at_c<2>(pixel64) / image.size()))));
+    }
+
+    auto average_colors(boost::gil::rgb8_image_t image)
+    {
+      auto accumulator = boost::gil::rgb64f_pixel_t{};
+      auto view = const_view(image);
+
+      std::ranges::for_each(view, [&](auto const & source_pixel) {
+        at_c<0>(accumulator) += std::pow(boost::gil::at_c<0>(source_pixel), 2);
+        at_c<1>(accumulator) += std::pow(boost::gil::at_c<1>(source_pixel), 2);
+        at_c<2>(accumulator) += std::pow(boost::gil::at_c<2>(source_pixel), 2);
+      });
+
+      at_c<0>(accumulator) = std::sqrt(at_c<0>(accumulator) / view.size());
+      at_c<1>(accumulator) = std::sqrt(at_c<1>(accumulator) / view.size());
+      at_c<2>(accumulator) = std::sqrt(at_c<2>(accumulator) / view.size());
+
+      return accumulator;
+    }
+
+    //
+  }  // namespace
+
   void set_wallpaper(std::filesystem::path wallpaper)
   {
     using namespace wanda::literals;
     using namespace wanda::std_ext;
     using namespace std::string_literals;
 
+    auto image = load_image(wallpaper);
+    auto color = average_colors(std::move(image));
+    auto hexstring = fmt::format("#{:02X}{:02X}{:02X}",
+                                 static_cast<std::uint8_t>(at_c<0>(color)),
+                                 static_cast<std::uint8_t>(at_c<1>(color)),
+                                 static_cast<std::uint8_t>(at_c<2>(color)));
+
     with("org.gnome.desktop.background"_setting, [&](auto & setting) {
+      with(setting["primary-color"_key], [&](auto & value) {
+        value = hexstring;
+      });
       with(setting["picture-uri"_key], [&](auto & value) {
         value = "file://" + wallpaper.native();
       }) ||
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