缩略图生成
jerry thinkphp 2015年11月18日
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自动生成缩略图，支持裁切。调用方法简单：thumb.php?url=/yovae/data/userface/000/00/00/41_middle_face.jpg?1247718988&w=20&h=20
<?php
/*
* 自动缩略图 参数 url|w|h|type="cut/full"|mark="text/image|r"
* thumb.php?url=/yovae/data/userface/000/00/00/41_middle_face.jpg?1247718988&w=20&h=20
*/
error_reporting(0);
set_time_limit(30);
$biggest_memory_limit = 256; //单位M，后缀不要加M
//全局定义文件
//require 'define.inc.php';
//临时目录
$tempDir = "./data/thumb_temp/";
checkDir($tempDir);
//分析URL
$url = urldecode($_GET['url']);
$url = preg_replace('/(.*)\?(.*)$/','$1',$url);
//XSS脚本攻击探测
//include THINK_PATH.'/Vendor/xss.php';
//DetectXSS($url);
//2009-10-7 修改 将本地图片修改成相对地址，避免file_get_contents不能读取远程文件时出错（可修改php.ini 设置 allow_fopen_url 为 true）
//$url = str_ireplace(SITE_URL,'.',$url);
if(file_exists($url)){
$url = $url;
}elseif($result = GrabImage($url,$tempDir)){
$url = $result;
$grab_temp_file = $result;
}else{
$url = "./Public/images/nopic.jpg";
}
//解析参数
$w = $_GET['w']?intval($_GET['w']):'100'; //宽度
$h = $_GET['h']?intval($_GET['h']):'100'; //高度
$t = $_GET['t']=='f'?'f':'c'; //是否切割
$r = $_GET['r']?1:0; //是否覆盖
//目录名hash
$fileHash = md5($url.$w.$h);
$hashPath = substr($fileHash,0,2).'/'.substr($fileHash,2,2).'/';
//缩图目录
$thumbDir = "./data/thumb/".$hashPath;
checkDir($thumbDir);
if(!$sourceInfo['type'])
$sourceInfo['type'] == 'jpg';
$tempFile = $tempDir.$fileHash.'.'.$sourceInfo['type'];
$thumbFile = $thumbDir.$fileHash."_".$w."_".$h."_".$t.'.'.$sourceInfo['type'];
$img = new Image();
//判断是否替换，存在则跳转，不存在继续进行
if(!$r && file_exists($thumbFile)){
//这里有2种方法，第一种多一次跳转，多一个http连接数，第二种，要进行一次php处理，多占用一部分内存。
//header('location:'.$thumbFile);
$img->showImg($thumbFile);
}
//不存在输出
if(copy($url,$tempFile)){
//判断图片大小 如果图片宽和高都小于要缩放的比例 直接输出
$info = getimagesize($tempFile);
//判断处理图片大约需要的内存
$need_memory = (($info[0]*$info[1])/100000);
$memory_limit = ini_get('memory_limit');
if( ($need_memory > $memory_limit) && ($need_memory <= $biggest_memory_limit) ){
ini_set('memory_limit',$need_memory.'M');
}
if($info[0]<=$w && $info[1]<=$h){
copy($tempFile,$thumbFile);
$img->showImg($thumbFile,'',$info[0],$info[1]);
unlink($tempFile);
unlink($grab_temp_file);
exit;
}else{
//生成缩图
if($t=='c'){
$thumb = $img->cutThumb($tempFile,$thumbFile,$w,$h);
}elseif($t=='f'){
$thumb = $img->thumb($tempFile,'',$thumbFile,$w,$h);
}
//输出缩图
$img->showImg($thumb,'',$w,$h);
unlink($tempFile);
unlink($grab_temp_file);
exit;
}
}
//获取远程图片
function GrabImage($url,$thumbDir) {
if($url=="") return false;
$filename = md5($url).strrchr($url,".");
$img = file_get_contents($url);
if(!$img) return false;
$filepath = $thumbDir.$filename;
$result = file_put_contents($filepath,$img);
if($result){
return $filepath;
}else{
return false;
}
}
//检查并创建多级目录
function checkDir($path){
$pathArray = explode('/',$path);
$nowPath = '';
array_pop($pathArray);
foreach ($pathArray as $key=>$value){
if ( ''==$value ){
unset($pathArray[$key]);
}else{
if ( $key == 0 )
$nowPath .= $value;
else
$nowPath .= '/'.$value;
if ( !is_dir($nowPath) ){
if ( !mkdir($nowPath, 0777) ) return false;
}
}
}
return true;
}
function imagecreatefrombmp($fname) {
$buf=@file_get_contents($fname);
if(strlen($buf)<54) return false;
$file_header=unpack("sbfType/LbfSize/sbfReserved1/sbfReserved2/LbfOffBits",substr($buf,0,14));
if($file_header["bfType"]!=19778) return false;
$info_header=unpack("LbiSize/lbiWidth/lbiHeight/sbiPlanes/sbiBitCountLbiCompression/LbiSizeImage/lbiXPelsPerMeter/lbiYPelsPerMeter/LbiClrUsed/LbiClrImportant",substr($buf,14,40));
if($info_header["biBitCountLbiCompression"]==2) return false;
$line_len=round($info_header["biWidth"]*$info_header["biBitCountLbiCompression"]/8);
$x=$line_len%4;
if($x>0) $line_len+=4-$x;
$img=imagecreatetruecolor($info_header["biWidth"],$info_header["biHeight"]);
switch($info_header["biBitCountLbiCompression"]){
case 4:
$colorset=unpack("L*",substr($buf,54,64));
for($y=0;$y<$info_header["biHeight"];$y++){
$colors=array();
$y_pos=$y*$line_len+$file_header["bfOffBits"];
for($x=0;$x<$info_header["biWidth"];$x++){
if($x%2)
$colors[]=$colorset[(ord($buf[$y_pos+($x+1)/2])&0xf)+1];
else
$colors[]=$colorset[((ord($buf[$y_pos+$x/2+1])>>4)&0xf)+1];
}
imagesetstyle($img,$colors);
imageline($img,0,$info_header["biHeight"]-$y-1,$info_header["biWidth"],$info_header["biHeight"]-$y-1,IMG_COLOR_STYLED);
}
break;
case 8:
$colorset=unpack("L*",substr($buf,54,1024));
for($y=0;$y<$info_header["biHeight"];$y++){
$colors=array();
$y_pos=$y*$line_len+$file_header["bfOffBits"];
for($x=0;$x<$info_header["biWidth"];$x++){
$colors[]=$colorset[ord($buf[$y_pos+$x])+1];
}
imagesetstyle($img,$colors);
imageline($img,0,$info_header["biHeight"]-$y-1,$info_header["biWidth"],$info_header["biHeight"]-$y-1,IMG_COLOR_STYLED);
}
break;
case 16:
for($y=0;$y<$info_header["biHeight"];$y++){
$colors=array();
$y_pos=$y*$line_len+$file_header["bfOffBits"];
for($x=0;$x<$info_header["biWidth"];$x++){
$i=$x*2;
$color=ord($buf[$y_pos+$i])|(ord($buf[$y_pos+$i+1])<<8);
$colors[]=imagecolorallocate($img,(($color>>10)&0x1f)*0xff/0x1f,(($color>>5)&0x1f)*0xff/0x1f,($color&0x1f)*0xff/0x1f);
}
imagesetstyle($img,$colors);
imageline($img,0,$info_header["biHeight"]-$y-1,$info_header["biWidth"],$info_header["biHeight"]-$y-1,IMG_COLOR_STYLED);
}
break;
case 24:
for($y=0;$y<$info_header["biHeight"];$y++){
$colors=array();
$y_pos=$y*$line_len+$file_header["bfOffBits"];
for($x=0;$x<$info_header["biWidth"];$x++){
$i=$x*3;
$colors[]=imagecolorallocate($img,ord($buf[$y_pos+$i+2]),ord($buf[$y_pos+$i+1]),ord($buf[$y_pos+$i]));
}
imagesetstyle($img,$colors);
imageline($img,0,$info_header["biHeight"]-$y-1,$info_header["biWidth"],$info_header["biHeight"]-$y-1,IMG_COLOR_STYLED);
}
break;
default:
return false;
break;
}
return $img;
}
function imagebmp(&$im, $filename = '', $bit = 8, $compression = 0)
{
if (!in_array($bit, array(1, 4, 8, 16, 24, 32)))
{
$bit = 8;
}
else if ($bit == 32) // todo:32 bit
{
$bit = 24;
}
$bits = pow(2, $bit);
// 调整调色板
imagetruecolortopalette($im, true, $bits);
$width = imagesx($im);
$height = imagesy($im);
$colors_num = imagecolorstotal($im);
if ($bit <= 8)
{
// 颜色索引
$rgb_quad = '';
for ($i = 0; $i < $colors_num; $i ++)
{
$colors = imagecolorsforindex($im, $i);
$rgb_quad .= chr($colors['blue']) . chr($colors['green']) . chr($colors['red']) . "\0"; }
// 位图数据
$bmp_data = '';
// 非压缩
if ($compression == 0 || $bit < 8)
{
if (!in_array($bit, array(1, 4, 8)))
{
$bit = 8;
}
$compression = 0;
// 每行字节数必须为4的倍数，补齐。
$extra = '';
$padding = 4 - ceil($width / (8 / $bit)) % 4;
if ($padding % 4 != 0)
{
$extra = str_repeat("\0", $padding);
}
for ($j = $height - 1; $j >= 0; $j --)
{
$i = 0;
while ($i < $width)
{
$bin = 0;
$limit = $width - $i < 8 / $bit ? (8 / $bit - $width + $i) * $bit : 0;
for ($k = 8 - $bit; $k >= $limit; $k -= $bit)
{
$index = imagecolorat($im, $i, $j);
$bin |= $index << $k;
$i ++;
}
$bmp_data .= chr($bin);
}
$bmp_data .= $extra;
}
}
// RLE8 压缩
else if ($compression == 1 && $bit == 8)
{
for ($j = $height - 1; $j >= 0; $j --)
{
$last_index = "\0";
$same_num = 0;
for ($i = 0; $i <= $width; $i ++)
{
$index = imagecolorat($im, $i, $j);
if ($index !== $last_index || $same_num > 255)
{
if ($same_num != 0)
{
$bmp_data .= chr($same_num) . chr($last_index);
}
$last_index = $index;
$same_num = 1;
}
else
{
$same_num ++;
}
}
$bmp_data .= "\0\0";
}
$bmp_data .= "\0\1";
}
$size_quad = strlen($rgb_quad);
$size_data = strlen($bmp_data);
}
else
{
// 每行字节数必须为4的倍数，补齐。
$extra = '';
$padding = 4 - ($width * ($bit / 8)) % 4;
if ($padding % 4 != 0)
{
$extra = str_repeat("\0", $padding);
}
// 位图数据
$bmp_data = '';
for ($j = $height - 1; $j >= 0; $j --)
{
for ($i = 0; $i < $width; $i ++)
{
$index = imagecolorat($im, $i, $j);
$colors = imagecolorsforindex($im, $index);
if ($bit == 16)
{
$bin = 0 << $bit;
$bin |= ($colors['red'] >> 3) << 10;
$bin |= ($colors['green'] >> 3) << 5;
$bin |= $colors['blue'] >> 3;
$bmp_data .= pack("v", $bin);
}
else
{
$bmp_data .= pack("c*", $colors['blue'], $colors['green'], $colors['red']);
}
// todo: 32bit;
}
$bmp_data .= $extra;
}
$size_quad = 0;
$size_data = strlen($bmp_data);
$colors_num = 0;
}
// 位图文件头
$file_header = "BM" . pack("V3", 54 + $size_quad + $size_data, 0, 54 + $size_quad);
// 位图信息头
$info_header = pack("V3v2V*", 0x28, $width, $height, 1, $bit, $compression, $size_data, 0, 0, $colors_num, 0);
// 写入文件
if ($filename != '')
{
$fp = fopen("test.bmp", "wb");
fwrite($fp, $file_header);
fwrite($fp, $info_header);
fwrite($fp, $rgb_quad);
fwrite($fp, $bmp_data);
fclose($fp);
return 1;
}
// 浏览器输出
header("Content-Type: image/bmp");
echo $file_header . $info_header;
echo $rgb_quad;
echo $bmp_data;
return 1;
}
class Image
{//类定义开始
/**
+----------------------------------------------------------
* 架构函数
*
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
function __construct()
{
}
/**
+----------------------------------------------------------
* 取得图像信息
*
+----------------------------------------------------------
* @static
* @access public
+----------------------------------------------------------
* @param string $image 图像文件名
+----------------------------------------------------------
* @return mixed
+----------------------------------------------------------
*/
function getImageInfo($img) {
$imageInfo = getimagesize($img);
if( $imageInfo!== false) {
if(function_exists(image_type_to_extension)){
$imageType = strtolower(substr(image_type_to_extension($imageInfo[2]),1));
}else{
$imageType = strtolower(substr($img,strrpos($img,'.')+1));
}
$imageSize = filesize($img);
$info = array(
"width"=>$imageInfo[0],
"height"=>$imageInfo[1],
"type"=>$imageType,
"size"=>$imageSize,
"mime"=>$imageInfo['mime']
);
return $info;
}else {
return false;
}
}
/**
+----------------------------------------------------------
* 显示服务器图像文件
* 支持URL方式
+----------------------------------------------------------
* @static
* @access public
+----------------------------------------------------------
* @param string $imgFile 图像文件名
* @param string $text 文字字符串
* @param string $width 图像宽度
* @param string $height 图像高度
+----------------------------------------------------------
* @return void
+----------------------------------------------------------
*/
function showImg($imgFile,$text='',$width=80,$height=30) {
//获取图像文件信息
//2007/6/26 增加图片水印输出，$text为图片的完整路径即可
$info = Image::getImageInfo($imgFile);
if($info !== false) {
$createFun = str_replace('/','createfrom',$info['mime']);
$im = $createFun($imgFile);
if($im) {
$ImageFun= str_replace('/','',$info['mime']);
//水印开始
if(!empty($text)) {
$tc = imagecolorallocate($im, 0, 0, 0);
if(is_file($text)&&file_exists($text)){
// 取得水印信息
$textInfo = Image::getImageInfo($text);
$createFun2= str_replace('/','createfrom',$textInfo['mime']);
$waterMark = $createFun2($text);
$imgW = $info["width"];
$imgH = $info["width"]*$textInfo["height"]/$textInfo["width"];
$y = ($info["height"]-$textInfo["height"])/2;
if(function_exists("ImageCopyResampled"))
ImageCopyResampled($im,$waterMark,0,$y,0,0, $imgW,$imgH, $textInfo["width"],$textInfo["height"]);
else
ImageCopyResized($im,$waterMark,0,$y,0,0,$imgW,$imgH, $textInfo["width"],$textInfo["height"]);
}else{
imagestring($im, 3, 5, 5, $text, $tc);
}
//ImageDestroy($tc);
}
//水印结束
if($info['type']=='png' || $info['type']=='gif') {
imagealphablending($im, FALSE);//取消默认的混色模式
imagesavealpha($im,TRUE);//设定保存完整的 alpha 通道信息
}
Header("Content-type: ".$info['mime']);
$ImageFun($im);
@ImageDestroy($im);
return ;
}
}
//获取或者创建图像文件失败则生成空白PNG图片
$im = imagecreatetruecolor($width, $height);
$bgc = imagecolorallocate($im, 255, 255, 255);
$tc = imagecolorallocate($im, 0, 0, 0);
imagefilledrectangle($im, 0, 0, 150, 30, $bgc);
imagestring($im, 4, 5, 5, "no pic", $tc);
Image::output($im);
return ;
}
// 切割缩图cutThumb
// 2007/6/15
function cutThumb($image,$filename='',$maxWidth='200',$maxHeight='50',$warterMark='',$type='',$interlace=true,$suffix='_thumb')
{
// 获取原图信息
$info = Image::getImageInfo($image);
if($info !== false) {
$srcWidth = $info['width'];
$srcHeight = $info['height'];
$pathinfo = pathinfo($image);
$type = $pathinfo['extension'];
$type = empty($type)?$info['type']:$type;
$type = strtolower($type);
$interlace = $interlace? 1:0;
unset($info);
// 载入原图
$createFun = 'ImageCreateFrom'.($type=='jpg'?'jpeg':$type);
$srcImg = $createFun($image);
//创建缩略图
if($type!='gif' && function_exists('imagecreatetruecolor'))
$thumbImg = imagecreatetruecolor($maxWidth, $maxHeight);
else
$thumbImg = imagecreate($maxWidth, $maxHeight);
// 新建PNG缩略图通道透明处理
if('png'==$type) {
imagealphablending($thumbImg, false);//取消默认的混色模式
imagesavealpha($thumbImg,true);//设定保存完整的 alpha 通道信息
}elseif('gif'==$type) {
// 新建GIF缩略图预处理，保证透明效果不失效
$background_color = imagecolorallocate($thumbImg, 0,255,0); // 指派一个绿色
imagecolortransparent($thumbImg,$background_color); // 设置为透明色，若注释掉该行则输出绿色的图
}
// 计算缩放比例
if(($maxWidth/$maxHeight)>=($srcWidth/$srcHeight)){
//宽不变,截高，从中间截取 y=
$width = $srcWidth;
$height = $srcWidth*($maxHeight/$maxWidth);
$x = 0;
$y = ($srcHeight-$height)*0.5;
}else{
//高不变,截宽，从中间截取，x=
$width = $srcHeight*($maxWidth/$maxHeight);
$height = $srcHeight;
$x = ($srcWidth-$width)*0.5;
$y = 0;
}
// 复制图片
if(function_exists("ImageCopyResampled")){
ImageCopyResampled($thumbImg, $srcImg, 0, 0, $x, $y, $maxWidth, $maxHeight, $width,$height);
}else{
ImageCopyResized($thumbImg, $srcImg, 0, 0, $x, $y, $maxWidth, $maxHeight, $width,$height);
}
ImageDestroy($srcImg);
/*水印开始* /
if($warterMark){
//计算水印的位置,默认居中
$textInfo = Image::getImageInfo($warterMark);
$textW = $textInfo["width"];
$textH = $textInfo["height"];
unset($textInfo);
$mark = imagecreatefrompng($warterMark);
$imgW = $width;
$imgH = $width*$textH/$textW;
$y = ($height-$textH)/2;
if(function_exists("ImageCopyResampled")){
ImageCopyResampled($thumbImg,$mark,0,$y,0,0, $imgW,$imgH, $textW,$textH);
}else{
ImageCopyResized($thumbImg,$mark,0,$y,0,0,$imgW,$imgH, $textW,$textH);
}
ImageDestroy($mark);
}
/*水印结束*/
/*if('gif'==$type || 'png'==$type) {
//imagealphablending($thumbImg, FALSE);//取消默认的混色模式
//imagesavealpha($thumbImg,TRUE);//设定保存完整的 alpha 通道信息
$background_color = ImageColorAllocate($thumbImg, 0,255,0);
// 指派一个绿色
imagecolortransparent($thumbImg,$background_color);
// 设置为透明色，若注释掉该行则输出绿色的图
}*/
// 对jpeg图形设置隔行扫描
if('jpg'==$type || 'jpeg'==$type) imageinterlace($thumbImg,$interlace);
// 生成图片
//$imageFun = 'image'.($type=='jpg'?'jpeg':$type);
$imageFun = 'imagepng';
$filename = empty($filename)? substr($image,0,strrpos($image, '.')).$suffix.'.'.$type : $filename;
$imageFun($thumbImg,$filename);
ImageDestroy($thumbImg);
return $filename;
}
return false;
}
/**
+----------------------------------------------------------
* 生成缩略图
*
+----------------------------------------------------------
* @static
* @access public
+----------------------------------------------------------
* @param string $image 原图
* @param string $type 图像格式
* @param string $filename 缩略图文件名
* @param string $maxWidth 宽度
* @param string $maxHeight 高度
* @param string $position 缩略图保存目录
* @param boolean $interlace 启用隔行扫描
+----------------------------------------------------------
* @return void
+----------------------------------------------------------
* @throws ThinkExecption
+----------------------------------------------------------
*/
//2007/7/18 添加水印缩略图
function thumb($image,$type='',$filename='',$maxWidth=200,$maxHeight=50,$warterMark='',$interlace=true,$suffix='_thumb')
{
// 获取原图信息
$info = Image::getImageInfo($image);
if($info !== false) {
$srcWidth = $info['width'];
$srcHeight = $info['height'];
$pathinfo = pathinfo($image);
$type = $pathinfo['extension'];
$type = empty($type)?$info['type']:$type;
$type = strtolower($type);
$interlace = $interlace? 1:0;
unset($info);
$scale = min($maxWidth/$srcWidth, $maxHeight/$srcHeight); // 计算缩放比例
// 缩略图尺寸
$width = (int)($srcWidth*$scale);
$height = (int)($srcHeight*$scale);
// 载入原图
$createFun = 'ImageCreateFrom'.($type=='jpg'?'jpeg':$type);
$srcImg = $createFun($image);
//创建缩略图
if($type!='gif' && function_exists('imagecreatetruecolor'))
$thumbImg = imagecreatetruecolor($width, $height);
else
$thumbImg = imagecreate($width, $height);
// 新建PNG缩略图通道透明处理
if('png'==$type) {
imagealphablending($thumbImg, false);//取消默认的混色模式
imagesavealpha($thumbImg,true);//设定保存完整的 alpha 通道信息
}elseif('gif'==$type) {
// 新建GIF缩略图预处理，保证透明效果不失效
$background_color = imagecolorallocate($thumbImg, 0,255,0); // 指派一个绿色
imagecolortransparent($thumbImg,$background_color); // 设置为透明色，若注释掉该行则输出绿色的图
}
// 复制图片
if(function_exists("ImageCopyResampled"))
ImageCopyResampled($thumbImg, $srcImg, 0, 0, 0, 0, $width, $height, $srcWidth,$srcHeight);
else
ImageCopyResized($thumbImg, $srcImg, 0, 0, 0, 0, $width, $height, $srcWidth,$srcHeight);
ImageDestroy($srcImg);
/*
//水印开始
//计算水印的位置,默认居中
$textInfo = Image::getImageInfo($warterMark);
$textW = $textInfo["width"];
$textH = $textInfo["height"];
unset($textInfo);
$mark = imagecreatefrompng($warterMark);
$imgW = $width;
$imgH = $width*$textH/$textW;
$y = ($height-$textH)/2;
if(function_exists("ImageCopyResampled")){
ImageCopyResampled($thumbImg,$mark,0,$y,0,0, $imgW,$imgH, $textW,$textH);
}else{
ImageCopyResized($thumbImg,$mark,0,$y,0,0,$imgW,$imgH, $textW,$textH);
}
ImageDestroy($mark);
//水印结束
*/
/*if('gif'==$type || 'png'==$type) {
imagealphablending($thumbImg, FALSE);//取消默认的混色模式
imagesavealpha($thumbImg,TRUE);//设定保存完整的 alpha 通道信息
$background_color = ImageColorAllocate($thumbImg, 0,255,0);// 指派一个绿色
imagecolortransparent($thumbImg,$background_color);// 设置为透明色，若注释掉该行则输出绿色的图
}*/
if('jpg'==$type || 'jpeg'==$type) {
imageinterlace($thumbImg,$interlace);// 对jpeg图形设置隔行扫描
}
// 生成图片
// $imageFun = 'image'.($type=='jpg'?'jpeg':$type);
$imageFun = 'imagepng';
$filename = empty($filename)? substr($image,0,strrpos($image, '.')).$suffix.'.'.$type : $filename;
$imageFun($thumbImg,$filename);
ImageDestroy($thumbImg);
return $filename;
}
return false;
}
function output($im,$type='png')
{
Header("Content-type: image/".$type);
//$ImageFun='Image'.$type;
$ImageFun='ImagePNG';
$ImageFun($im);
ImageDestroy($im);
}
}//类定义结束
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