qcminecraft/Carbon-Forum-F

<?php
/*
 * PHP-Image-Resize-Class
 * https://github.com/lincanbin/PHP-Image-Resize-Class/tree/master
 *
 * Copyright 2015, Lin Canbin
 * http://www.94cb.com/
 *
 * Licensed under the Apache License, Version 2.0:
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * A PHP class which can resize the image easily.
 */
class ImageResize
{
    
    private $PostField;
    private $ImageSize;
    private $ImageObject;
    
    public function __construct($Source, $PostField)
    {
        $this->PostField = $PostField;
        if($Source == 'PostField'){
            $this->GetImageObjectFromPostField();
        }else{
            $this->GetImageObjectFromString();
        }
        
    }
    private function GetImageObjectFromString()
    {
        $this->ImageSize = getimagesizefromstring($this->PostField);
        if($this->ImageSize){
            $this->ImageObject = imagecreatefromstring($this->PostField);
        }
    }

    private function GetImageObjectFromPostField()
    {
        if (stristr($_FILES[$this->PostField]['type'], "image")) {
            $this->ImageSize = getimagesize($_FILES[$this->PostField]['tmp_name']);
            if ($this->ImageSize) {
                //创建源图片
                /* 
                $ImageTypeArray = array(
                    0=>'UNKNOWN',
                    1=>'GIF',
                    2=>'JPEG',
                    3=>'PNG',
                    4=>'SWF',
                    5=>'PSD',
                    6=>'BMP',
                    7=>'TIFF_II',
                    8=>'TIFF_MM',
                    9=>'JPC',
                    10=>'JP2',
                    11=>'JPX',
                    12=>'JB2',
                    13=>'SWC',
                    14=>'IFF',
                    15=>'WBMP',
                    16=>'XBM',
                    17=>'ICO',
                    18=>'COUNT'
                );
                $ImageType = $ImageTypeArray[$this->ImageSize[2]];
                */
                switch ($this->ImageSize[2]) {
                    case 1: //GIF
                        $this->ImageObject = imagecreatefromgif($_FILES[$this->PostField]['tmp_name']);
                        break;
                    case 2: //JPEG
                        $this->ImageObject = imagecreatefromjpeg($_FILES[$this->PostField]['tmp_name']);
                        break;
                    case 3: //PNG
                        $this->ImageObject = imagecreatefrompng($_FILES[$this->PostField]['tmp_name']);
                        break;
                    default:
                        break;
                }
            }
        }
    }
    
    //bool Resize ( int $TargetMaxPx, string $TargetPath [, int $Quality ] )
    public function Resize($TargetMaxPx, $TargetPath, $Quality = 95)
    {
        if (isset($this->ImageObject)) {
            $MinImagePx = min($this->ImageSize[0], $this->ImageSize[1]);
            //chmod($TargetPath, 0777);
            $Percent = 1.0;
            if($this->ImageSize[0] > $this->ImageSize[1]){
                $SourceX = round(($this->ImageSize[0] - $this->ImageSize[1])/2);
                $SourceY = 0;
                $Percent = 1.0 * $TargetMaxPx / $this->ImageSize[0];
            }else{
                $SourceX = 0;
                $SourceY = round(($this->ImageSize[1] - $this->ImageSize[0])/2);
                $Percent = 1.0 * $TargetMaxPx / $this->ImageSize[1];
            }
            //一个正方形图像，用来临时保存原图像中间部分
            $TempImageData = imagecreatetruecolor($MinImagePx, $MinImagePx);
            //将原图像中间部分拷贝到正方形中
            imagecopy($TempImageData, $this->ImageObject, 0, 0, $SourceX, $SourceY, $MinImagePx, $MinImagePx);
            //目标图像
            $TargetImageData = imagecreatetruecolor($TargetMaxPx, $TargetMaxPx);
            $Background      = imagecolorallocate($TargetImageData, 255, 255, 255);
            imagefill($TargetImageData, 0, 0, $Background);
            //缩放
            imagecopyresampled($TargetImageData, $TempImageData, 0, 0, 0, 0, $TargetMaxPx, $TargetMaxPx, $MinImagePx, $MinImagePx);
            return imagejpeg($TargetImageData, $TargetPath, $Quality);
        } else {
            return false;
        }
    }
}