vsgallery/lib/thumbs.class.php

80 lines
2.1 KiB
PHP

<?php
class thumb {
protected string $imagedir;
protected string $thumbdir;
protected string $thumburl;
protected int $w = 200;
protected int $h = 200;
const IMAGE_HANDLERS = [
IMAGETYPE_JPEG => [
'load' => 'imagecreatefromjpeg',
],
IMAGETYPE_PNG => [
'load' => 'imagecreatefrompng',
],
IMAGETYPE_GIF => [
'load' => 'imagecreatefromgif',
],
IMAGETYPE_WEBP => [
'load' => 'imagecreatefromwebp',
]
];
public function __construct($idir, $tdir, $turl, $width, $heigth) {
$this->imagedir = $idir;
$this->thumbdir = $tdir;
$this->thumburl = $turl;
$this->w = $width;
$this->h = $heigth;
}
public function get_thumb($iname) {
$src = $this->imagedir.$iname;
$dstname = hash('sha256', $src);
$dstpath = $this->thumbdir.$dstname.'.jpg';
if (!file_exists($dstpath)) {
$type = exif_imagetype($src);
if ($type == 0) {
error_log("$src: Unknown Image Type");
return "img/error.png";
}
$image = call_user_func(self::IMAGE_HANDLERS[$type]['load'], $src);
if ($image == false) {
error_log("$src: Image Loading Failed");
return "img/error.png";
}
$srcwidth = imagesx($image);
$srcheight = imagesy($image);
$ratio = min($this->w / $srcwidth, $this->h / $srcheight);
$width = round($srcwidth*$ratio);
$height = round($srcheight*$ratio);
$thumbnail = imagecreatetruecolor($width, $height);
if ($type == IMAGETYPE_GIF || $type == IMAGETYPE_PNG) {
imagecolortransparent($thumbnail, imagecolorallocate($thumbnail, 0, 0, 0));
if ($type == IMAGETYPE_PNG) {
imagealphablending($thumbnail, false);
imagesavealpha($thumbnail, true);
}
}
imagecopyresampled($thumbnail, $image, 0, 0, 0, 0, $width, $height, $srcwidth, $srcheight);
call_user_func('imagejpeg',$thumbnail,$dstpath,100);
imagedestroy($image);
imagedestroy($thumbnail);
}
return $this->thumburl.$dstname.'.jpg';
}
}
?>