php图片裁剪,叠加,生成ico

男娘i 2022-06-16 02:07 199阅读 0赞

<?php

// **************************************** // 
    // 功能:图片叠加
    // 参数: $dst 背景图片地址
    // src 叠加图片地址
    // newfile 另存图片文件名
    // left 距离背景图片左边的距离
    // top 距离背景图片上部的距离
    // **************************************** // 
    function superimposedPng($dst,$src,$newfile,$left=null,$top=null)
    {
    //得到原始图片信息
    $dst_im = imagecreatefrompng($dst);
    $dst_info = getimagesize($dst);
    imagesavealpha($dst_im, true);
    //水印图像
    $src_im = imagecreatefrompng($src);
    $src_info = getimagesize($src);
    
    if(empty($left)){
    	$left = $dst_info[0]-$src_info[0];
    }
    if(empty($top)){
    	$top = $dst_info[1]-$src_info[1];
    }
    
    //合并水印图片
    imagecopy($dst_im,$src_im,$left,$top,0,0,$src_info[0],$src_info[1]);
    
    //输出合并后水印图片
    imagepng($dst_im, $newfile);
    imagedestroy($dst_im);
    imagedestroy($src_im);
    }
    
    
    
    // **************************************** // 
    // 功能:图片叠加
    // 参数: $dst 背景图片地址
    // src png图片地址
    // size ico的大小
    // filename 转换的ico的名字
    // **************************************** // 
    function covertPngToIco($src,$size,$filename)
    {
    $im = imagecreatefrompng($src);
    $imginfo = getimagesize($src);
    
    $resize_im = @imagecreatetruecolor($size,$size);
    
    imagealphablending($resize_im, false);
    imagecolortransparent($resize_im, imagecolorallocatealpha($resize_im, 0, 0, 0,0));
    
    imagecopyresampled($resize_im,$im,0,0,0,0,$size,$size,$imginfo[0],$imginfo[1]);
    include "phpthumb.ico.php";
    $icon = new phpthumb_ico();
    $gd_image_array = array($resize_im);
    $icon_data = $icon->GD2ICOstring($gd_image_array);
    $filename = $filename.".ico";
    //保存ico
    file_put_contents($filename, $icon_data);
    }
    
    
    
    // **************************************** // 
    // 功能:重置图片大小
    // 参数: $im 图片值
    // maxwidth 转换长度
    // maxheight 转换高度
    // name 转换的名字
    // filetype 转换类型
    // **************************************** // 
    function resizeImage($img, $w, $h, $newfilename) {
     
     //Check if GD extension is loaded
     if (!extension_loaded('gd') && !extension_loaded('gd2')) {
      trigger_error("GD is not loaded", E_USER_WARNING);
      return false;
     }
     
     //Get Image size info
     $imgInfo = getimagesize($img);
     switch ($imgInfo[2]) {
      case 1: $im = imagecreatefromgif($img); break;
      case 2: $im = imagecreatefromjpeg($img);  break;
      case 3: $im = imagecreatefrompng($img); break;
      default:  trigger_error('Unsupported filetype!', E_USER_WARNING);  break;
     }
     
     //If image dimension is smaller, do not resize
     if ($imgInfo[0] <= $w && $imgInfo[1] <= $h) {
      $nHeight = $imgInfo[1];
      $nWidth = $imgInfo[0];
     }else{
                    //yeah, resize it, but keep it proportional
      if ($w/$imgInfo[0] > $h/$imgInfo[1]) {
       $nWidth = $w;
       $nHeight = $imgInfo[1]*($w/$imgInfo[0]);
      }else{
       $nWidth = $imgInfo[0]*($h/$imgInfo[1]);
       $nHeight = $h;
      }
     }
     $nWidth = round($nWidth);
     $nHeight = round($nHeight);
     
     $newImg = imagecreatetruecolor($nWidth, $nHeight);
     
     /* Check if this image is PNG or GIF, then set if Transparent*/  
     if(($imgInfo[2] == 1) OR ($imgInfo[2]==3)){
      imagealphablending($newImg, false);
      imagesavealpha($newImg,true);
      $transparent = imagecolorallocatealpha($newImg, 255, 255, 255, 127);
      imagefilledrectangle($newImg, 0, 0, $nWidth, $nHeight, $transparent);
     }
     imagecopyresampled($newImg, $im, 0, 0, 0, 0, $nWidth, $nHeight, $imgInfo[0], $imgInfo[1]);
     
     //Generate the file, and rename it to $newfilename
     switch ($imgInfo[2]) {
      case 1: imagegif($newImg,$newfilename); break;
      case 2: imagejpeg($newImg,$newfilename);  break;
      case 3: imagepng($newImg,$newfilename); break;
      default:  trigger_error('Failed resize image!', E_USER_WARNING);  break;
     }
       
       return $newfilename;
    }
    
    //原始图像
    $logo = "su.png";
    resizeImage("ok.png","30","30","ok.png");
    
    superimposedPng($logo, "ok.png","su.png");
    
    covertPngToIco("su.png",64,"ok");
    
    
    ?>

代码方法是总结的php图片（image）缩放，叠加， 生成ico的代码， 代码中主要是处理png的情况。 对png图片生成后变黑，png透明进行了处理。 需要处理jpeg，jif图片需要要修改下imagecreatefrompng为相应的imagecreatefromjpg， imagecreatefromjif方法。

在使用过程中参考网址，以方便各位参考

[png透明处理][png]  [http://www.phpweblog.net/young40/archive/2008/11/26/6124.html][png]

[png图片变黑][png 1] [http://hi.baidu.com/guantong\_gt/blog/item/f35bbade73a6341d48540378.html][png 1]

[png生成ico][png_ico]   [http://www.jb51.net/article/12458.htm][png_ico]

[png缩放图片][png 2] [http://www.akemapa.com/2008/07/10/php-gd-resize-transparent-image-png-gif/][png 2]

[png]: http://www.phpweblog.net/young40/archive/2008/11/26/6124.html
[png 1]: http://hi.baidu.com/guantong_gt/blog/item/f35bbade73a6341d48540378.html
[png_ico]: http://www.jb51.net/article/12458.htm
[png 2]: http://www.akemapa.com/2008/07/10/php-gd-resize-transparent-image-png-gif/