Added cache

This will decrease the amount of CPU and RAM needed when generating fusions, but will use more disk space since we store each fusion as a PNG.

Check the changes in this commit for more information on how caching works.

cache/.gitignore

@@ -0,0 +1,3 @@
+# This directory is used to cache fusion as PNG files
+# This way, they are only generated once, saving CPU and RAM on the server, at the expense of disk space
+# Remember to delete the corresponding fusions in this directory if you make any change to an image in the /ponies directory, otherwise the changes won't be reflected

fusion.php

@@ -1,14 +1,28 @@
 <?php
+function makeFusion($getFrom, $getTo, $fromCli)
+{
     $debug = FALSE;
 
     include("ponies.php");
 
-$getFrom = $_GET["from"];
-$getTo = $_GET["to"];
-
     if(!isset($ponies[$getFrom]) || !isset($ponies[$getTo]))
         die("Invalid combination");
 
+    $cacheFilename = "./cache/" . $getFrom . "_" . $getTo . ".png";
+    $cacheUrl = "/cache/" . $getFrom . "_" . $getTo . ".png";
+    $useCache = TRUE;
+
+    // If this fusion was already cached, just redirect to it.
+    if($useCache && file_exists($cacheFilename))
+    {
+        if($fromCli === FALSE)
+        {
+            header("Location: " . $cacheUrl);
+        }
+
+        return;
+    }
+
     $from = imagecreatefrompng("./ponies/" . $ponies[$getFrom]["filename"]);
     $to = imagecreatefrompng("./ponies/" . $ponies[$getTo]["filename"]);
 
@@ -45,11 +59,24 @@ imagefill($from, 0, 0, imagecolorallocatealpha($from, 255, 255, 255, 127));
     // Crop 1px from bottom to avoid showing swatch
     $from = imagecrop($from, ['x' => 0, 'y' => 0, 'width' => imagesx($from), 'height' => imagesy($from) - 1]);
 
-if(!$debug)
+    if(!$debug && !$fromCli)
     {
         header('Content-Type: image/png');
         imagepng($from);
     }
 
+    // Save fusion to cache
+    imagepng($from, $cacheFilename);
+
     imagedestroy($to);
+}
+
+// Don't run the function if we're running from the command line
+if (php_sapi_name() !== 'cli')
+{
+    $getFrom = $_GET["from"];
+    $getTo = $_GET["to"];
+    makeFusion($getFrom, $getTo, FALSE);
+}
+
 ?>

generate_all.php

@@ -0,0 +1,42 @@
+<?php
+// Use this script to generate a cache of all the fusions. For security reasons this can only be done through the command line.
+// If you want to regenerate a fusion already in the cache, delete it from the cache first. This script will not generate a fusion that's already cached.
+// There is a small pause between each fusion in order to not overload the server. Depending on the number of ponies, this may take a while to run.
+
+if(php_sapi_name() !== 'cli')
+{
+    exit('You cannot run this script in your browser.');
+}
+
+require("ponies.php");
+require("fusion.php");
+
+$totalPonies = 0;
+
+foreach($ponies as $id => $properties)
+{
+    if(strpos($id, "break") === FALSE)
+        $totalPonies++;
+}
+
+$totalFusions = $totalPonies * $totalPonies;
+
+$i = 0;
+foreach($ponies as $id => $properties)
+{
+    if(strpos($id, "break") === FALSE)
+    {
+        foreach($ponies as $idSecond => $propertiesSecond)
+        {
+            if(strpos($idSecond, "break") === FALSE)
+            {
+                $i++;
+                $percentage = sprintf("%3d", floor(($i / $totalFusions) * 100));
+                echo "($percentage%) [$i/$totalFusions] $id + $idSecond\n";
+                makeFusion($id, $idSecond, TRUE);
+                sleep(1);
+            }
+        }
+    }
+}
+?>