From: Mischa POSLAWSKY <perl@shiar.org>
Date: Tue, 19 Jun 2018 22:17:48 +0000 (+0200)
Subject: thumb: prefer native GD over external convert
X-Git-Tag: v3.3~10
X-Git-Url: http://git.shiar.net/minimedit.git/commitdiff_plain/e5da0ad603c58c2dd86581e35d6e1a60c0ae2e7d

thumb: prefer native GD over external convert

Commonly available unlike executed command which may be disallowed
(at Xenat) or missing (at Vimexx) on shared hosting servers.
---

diff --git a/thumb/index.php b/thumb/index.php
index 2849bb5..532499f 100644
--- a/thumb/index.php
+++ b/thumb/index.php
@@ -43,6 +43,9 @@ function mkthumb($source, $width, $height)
 	elseif (file_exists($target)) {
 		return;
 	}
+	elseif (extension_loaded('gd')) {
+		$backend = 'gd';
+	}
 	else {
 		$backend = 'exec';
 	}
@@ -53,6 +56,20 @@ function mkthumb($source, $width, $height)
 	return $target;
 }
 
+function mkthumb_gd($source, $target, $width, $height)
+{
+	$data = imagecreatefromstring(file_get_contents($source));
+	if (!$data) throw new Exception("error reading $source");
+	$orgwidth = imagesx($data);
+	$orgheight = imagesy($data);
+	$width = min($width, $orgwidth * $height / $orgheight);
+	$gd = imagecreatetruecolor($width, $height);
+	//TODO: trim
+	imagecopyresampled($gd, $data, 0, 0, 0, 0,
+			$width, $height, $orgwidth, $orgheight);
+	imagejpeg($gd, $target, 90);
+}
+
 function mkthumb_exec($source, $target, $width, $height)
 {
 	if (!function_exists('popen')) {