From c4867a83dd9e98e00e8ada2886565ccfa061709d Mon Sep 17 00:00:00 2001
From: John Alanbrook <john@pockle.world>
Date: Mon, 7 Nov 2022 22:07:29 +0000
Subject: [PATCH] Add generating efficient images

---
 router.php | 48 +++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 47 insertions(+), 1 deletion(-)

diff --git a/router.php b/router.php
index defbef3..52e530c 100644
--- a/router.php
+++ b/router.php
@@ -16,7 +16,7 @@ if (file_exists("site.json")) {
     return false;
 }
 
-if (preg_match('/\.(?:jpg|png|css|ico|scss|js|ttf|woff|txt)/', $_SERVER["REQUEST_URI"])) {
+if (preg_match('/\.(?:jpg|png|webp|css|ico|scss|js|ttf|woff|txt)/', $_SERVER["REQUEST_URI"])) {
     return false;
 }
 
@@ -138,6 +138,7 @@ die();
 
 function img_src($src, $root = "" ) {
     if (empty($root)) $root = $_SERVER['REQUEST_URI'];
+    if ($root == "/") $root = "";
     if ($src[0] != '/') {
         $write = "$root/$src";
     } else $write = $src;
@@ -168,6 +169,51 @@ function page_locked($page) {
   return false;
 }
 
+function gen_images($src) {
+    $path = pathinfo($src);
+
+
+
+    if (in_array($path['extension'], ["jpg", "jpeg"])) {
+       $pwebp = "$path[dirname]/$path[filename].webp";
+       $pe = ltrim($src, '/');
+       $we = ltrim($pwebp, '/');
+
+       if (!file_exists($we)) {
+           exec("convert -quality 80 $pe $we");
+       }
+   }
+}
+
+function make_img($src, $q=80) {
+   $p = img_src($src);
+   gen_images($p);
+   $path = pathinfo($p);
+   $pwebp = "$path[dirname]/$path[filename].webp";
+
+   echo <<<END
+   <picture>
+     <source srcset="$pwebp" type="image/webp" width=100%/>
+     <source srcset="$p" type="image/jpeg" width=100% />
+     <img src="$p" width=100% />
+   </picture>
+
+END;
+}
+
+function make_bkgd_img($src, $q=80) {
+    $p = img_src($src);
+
+    gen_images($p);
+    $path = pathinfo($p);
+    $pwebp = "$path[dirname]/$path[filename].webp";
+
+    $pe = ltrim($pwebp, '/');
+    $we = ltrim($p, '/');
+
+    return "background-image: image-set(url($pe) 1x, url($we) 1x)";
+}
+
 
 ?>