mirror of
https://github.com/icret/EasyImages2.0.git
synced 2025-01-08 11:58:03 +08:00
173 lines
6.2 KiB
PHP
173 lines
6.2 KiB
PHP
<?php
|
||
/* Author: Dejan QQ: 673008865
|
||
* 缩略图 - 图片等比例缩放
|
||
________________ ________________ ________________
|
||
| | | | | |
|
||
| | | top | | |
|
||
|________________| | | | |
|
||
| | |________________| | |
|
||
| middle | | | | |
|
||
| | | | |________________|
|
||
|----------------| | | | |
|
||
| | | | | bottom |
|
||
| | | | | |
|
||
|________________| |________________| |________________|
|
||
|
||
*/
|
||
|
||
// namespace Thumb;
|
||
// https://github.com/aileshe/Thumb
|
||
|
||
class Thumb
|
||
{
|
||
private static $img_type; # 原图片格式
|
||
|
||
/**
|
||
* 输出图象到浏览器
|
||
* @param String $filename 原图路径
|
||
* @param String $width 预生成缩略图宽度
|
||
* @param String $height 预生成缩略图高度
|
||
* @param String $valign [middle|top|bottom],默认 居中
|
||
*/
|
||
public static function show($filename, $width, $height, $valign = 'middle')
|
||
{
|
||
$thumb = self::make($filename, $width, $height, $valign);
|
||
header('Content-Type:image/' . self::$img_type);
|
||
echo $thumb;
|
||
}
|
||
|
||
/**
|
||
* 保存缩略图文件
|
||
* @param String $filename 原图路径
|
||
* @param String $output 缩略图输出路径
|
||
* @param String $width 预生成缩略图宽度
|
||
* @param String $height 预生成缩略图高度
|
||
* @param String $valign [middle|top|bottom],默认 居中
|
||
*/
|
||
public static function out($filename, $output, $width, $height, $valign = 'middle')
|
||
{
|
||
$thumb = self::make($filename, $width, $height, $valign);
|
||
$fh = fopen($output, 'wb'); # 二进制文件
|
||
fwrite($fh, $thumb);
|
||
fclose($fh);
|
||
}
|
||
|
||
/**
|
||
* 输出图象到浏览器并保存缩略图文件
|
||
* @param String $filename 原图路径
|
||
* @param String $output 缩略图输出路径
|
||
* @param String $width 预生成缩略图宽度
|
||
* @param String $height 预生成缩略图高度
|
||
* @param String $valign [middle|top|bottom],默认 居中
|
||
*/
|
||
public static function showOut($filename, $output, $width, $height, $valign = 'middle')
|
||
{
|
||
$thumb = self::make($filename, $width, $height, $valign);
|
||
$fh = fopen($output, 'wb'); # 二进制文件
|
||
fwrite($fh, $thumb);
|
||
fclose($fh);
|
||
header('Content-Type:image/' . self::$img_type);
|
||
echo $thumb;
|
||
}
|
||
|
||
/**
|
||
* 缩略图生成函数
|
||
* @param String $filename 原图路径
|
||
* @param String $width 预生成缩略图宽度
|
||
* @param String $height 预生成缩略图高度
|
||
* @param String $valign [middle|top|bottom],默认 居中
|
||
* @return FileString 原始图象流
|
||
*/
|
||
private static function make($filename, $width, $height, $valign = 'middle')
|
||
{
|
||
ini_set('gd.jpeg_ignore_warning', true);
|
||
/**
|
||
* 2022-1-4 23:34:37 EasyImage更改图像类型判断
|
||
* getimagesize索引2给出的是图像的类型，返回的是数字
|
||
* 1 = GIF，2 = JPG，3 = PNG，4 = SWF，5 = PSD，6 = BMP，7 = TIFF(intel byte order)，8 = TIFF(motorola byte order)，
|
||
* 9 = JPC，10 = JP2，11 = JPX，12 = JB2，13 = SWC，14 = IFF，15 = WBMP，16 = XBM
|
||
*/
|
||
$filetype = array(
|
||
0 => 'unknown',
|
||
1 => 'gif',
|
||
2 => 'jpeg',
|
||
3 => 'png',
|
||
4 => 'swf',
|
||
5 => 'psd',
|
||
6 => 'bmp',
|
||
7 => 'tif_ii',
|
||
8 => 'tiff_mm',
|
||
9 => 'jpc',
|
||
10 => 'jp2',
|
||
11 => 'jpx',
|
||
12 => 'jb2',
|
||
13 => 'swc',
|
||
14 => 'iff',
|
||
15 => 'wbmp',
|
||
16 => 'xbm',
|
||
17 => 'ico',
|
||
18 => 'webp'
|
||
);
|
||
# 获取图片信息
|
||
$imginfo = getimagesize($filename);
|
||
$img_w = $imginfo[0];
|
||
$img_h = $imginfo[1];
|
||
self::$img_type = $filetype[$imginfo[2]];
|
||
|
||
|
||
$thumb_h = $height; # 固定背景画布的高度
|
||
$height = $img_h / ($img_w / $width); # 图片等比例缩放后的高度=原图的高度÷(原图的宽度÷背景画布固定宽带)
|
||
|
||
# 创建新的背景画布
|
||
if ($height >= $thumb_h) {
|
||
$thumb = imagecreatetruecolor($width, $thumb_h);
|
||
@imagealphablending($thumb, false); //这里很重要,意思是不合并颜色,直接用$img图像颜色替换,包括透明色;2-1
|
||
@imagesavealpha($thumb, true); //这里很重要,意思是不要丢了$thumb图像的透明色;2-2 EasyImage修改
|
||
} else {
|
||
$thumb = imagecreatetruecolor($width, $height);
|
||
@imagealphablending($thumb, false); //这里很重要,意思是不合并颜色,直接用$img图像颜色替换,包括透明色;2-1
|
||
@imagesavealpha($thumb, true); //这里很重要,意思是不要丢了$thumb图像的透明色;2-2 EasyImage修改
|
||
$thumb_h = $height;
|
||
}
|
||
|
||
# 载入要缩放的图片
|
||
$loadimg = 'imagecreatefrom' . self::$img_type;
|
||
$tmp_img = $loadimg($filename);
|
||
|
||
|
||
switch ($valign) {
|
||
case 'top': {
|
||
$dst_y = 0;
|
||
break;
|
||
}
|
||
case 'middle': {
|
||
$dst_y = ($img_h - $img_w / $width * $thumb_h) / 2;
|
||
break;
|
||
}
|
||
case 'bottom': {
|
||
$dst_y = $img_h - $img_w / $width * $thumb_h;
|
||
break;
|
||
}
|
||
default: {
|
||
$dst_y = 0;
|
||
break;
|
||
}
|
||
}
|
||
|
||
# 合成缩略图
|
||
imagecopyresampled($thumb, $tmp_img, 0, 0, 0, $dst_y, $width, $height, $img_w, $img_h);
|
||
|
||
ob_clean();
|
||
# 展示图片
|
||
ob_start();
|
||
$showimg = 'image' . self::$img_type;
|
||
$showimg($thumb); # 输出原始图象流
|
||
$thumb_img = ob_get_clean();
|
||
|
||
# 释放资源
|
||
imagedestroy($tmp_img);
|
||
imagedestroy($thumb);
|
||
return $thumb_img;
|
||
}
|
||
}
|