Added colorIsDark twig filter

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/) and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## 2.0.0-beta.5 - 2018-11-15
+### Added
+- Added colorIsDark twig filter
+
 ## 2.0.0-beta.4 - 2018-11-05
 ### Fixed
 - Fixed a major bug causing the queue to build up.

composer.json

@@ -2,7 +2,7 @@
     "name": "born05/craft-colorextractor",
     "description": "Extract colors from image assets in Craft CMS. Requires a field named `imageColor` on all assets of kind image (can be color or plaintext)",
     "type": "craft-plugin",
-    "version": "2.0.0-beta.4",
+    "version": "2.0.0-beta.5",
     "keywords": [
         "craft",
         "cms",
@@ -38,7 +38,8 @@
         "changelogUrl": "https://raw.githubusercontent.com/born05/craft-colorextractor/master/CHANGELOG.md",
         "components": {
             "asset": "born05\\colorextractor\\services\\Asset",
-            "assetUpload": "born05\\colorextractor\\services\\AssetUpload"
+            "assetUpload": "born05\\colorextractor\\services\\AssetUpload",
+            "color": "born05\\colorextractor\\services\\Color"
         },
         "class": "born05\\colorextractor\\ColorExtractor"
     }

src/ColorExtractor.php

@@ -4,6 +4,7 @@
 
 use born05\colorextractor\services\Asset as AssetService;
 use born05\colorextractor\services\AssetUpload as AssetUploadService;
+use born05\colorextractor\services\Color as ColorService;
 use born05\colorextractor\twigextensions\ColorExtractorTwigExtension;
 
 use Craft;

src/services/Asset.php

@@ -55,12 +55,12 @@ public function getImageColor(AssetElement $asset, $forceSave = false)
                     $e->getMessage(),
                     __METHOD__
                 );
-
-                return false;
             }
 
-            $asset->setFieldValue('imageColor', $color);
-            Craft::$app->getElements()->saveElement($asset);
+            if (!empty($color)) {
+                $asset->setFieldValue('imageColor', $color);
+                Craft::$app->getElements()->saveElement($asset);
+            }
         }
 
         // Return color with black fallback.

src/services/Color.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace born05\colorextractor\services;
+
+use League\ColorExtractor\Color as LeagueColor;
+
+use Craft;
+use craft\base\Component;
+use craft\elements\Asset as AssetElement;
+
+class Color extends Component
+{
+    public function isDark(string $color) {
+        $intColor = LeagueColor::fromHexToInt($color);
+        $rgbColor = LeagueColor::fromIntToRgb($intColor);
+
+        $darkness = 1 - (0.299 * $rgbColor['r'] + 0.587 * $rgbColor['g'] + 0.114 * $rgbColor['b']) / 255;
+
+        return $darkness >= 0.5;
+    }
+}

src/twigextensions/ColorExtractorTwigExtension.php

@@ -24,6 +24,7 @@ public function getFilters()
     {
         return [
             new \Twig_SimpleFilter('colorExtractor', [$this, 'colorExtractorFilter']),
+            new \Twig_SimpleFilter('colorIsDark', [$this, 'colorIsDarkFilter']),
         ];
     }
 
@@ -36,4 +37,15 @@ public function colorExtractorFilter($asset)
     {
         return ColorExtractor::$plugin->asset->getImageColor($asset);
     }
+
+    /**
+     * @param null $asset
+     *
+     * @return boolean
+     */
+    public function colorIsDarkFilter($asset)
+    {
+        $color = ColorExtractor::$plugin->asset->getImageColor($asset);
+        return ColorExtractor::$plugin->color->isDark($color);
+    }
 }