php 水印生成图片压缩
2015-12-30 15:36
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<?php class Image { /** * 质量大小 */ public $size = 70; /** * 图片加水印 */ function imageMark($srcImg, $waterImg, $savepath=null, $savename=null, $positon=5, $alpha=100) { $temp = pathinfo($srcImg); $name = $temp['basename']; $path = $temp['dirname']; $exte = $temp['extension']; $savename = $savename ? $savename : $name; $savepath = $savepath ? $savepath : $path; $savefile = $savepath .'/'. $savename; $srcinfo = @getimagesize($srcImg); if (!$srcinfo) { throw new Exception("原文件不存在!"); } $waterinfo = @getimagesize($waterImg); if (!$waterinfo) { throw new Exception("水印图片不存在!"); } $srcImgObj = $this->image_create_from_ext($srcImg); if (!$srcImgObj) { return -3; //原文件图像对象建立失败 } $waterImgObj = $this->image_create_from_ext($waterImg); if (!$waterImgObj) { throw new Exception("水印文件图像对象建立失败!"); } switch ($positon) { //1顶部居左 case 1: $x=$y=0; break; //2顶部居右 case 2: $x = $srcinfo[0]-$waterinfo[0]; $y = 0; break; //3居中 case 3: $x = ($srcinfo[0]-$waterinfo[0])/2; $y = ($srcinfo[1]-$waterinfo[1])/2; break; //4底部居左 case 4: $x = 0; $y = $srcinfo[1]-$waterinfo[1]; break; //5底部居右 case 5: $x = $srcinfo[0]-$waterinfo[0]; $y = $srcinfo[1]-$waterinfo[1]; break; default: $x=$y=0; } imagecopymerge($srcImgObj, $waterImgObj, $x, $y, 0, 0, $waterinfo[0], $waterinfo[1], $alpha); switch ($srcinfo[2]) { case 1: imagegif($srcImgObj, $savefile); break; case 2: imagejpeg($srcImgObj, $savefile); break; case 3: imagepng($srcImgObj, $savefile); break; default:throw new Exception("保存失败!"); break; } imagedestroy($srcImgObj); imagedestroy($waterImgObj); return $savefile; } function image_create_from_ext( $imgfile ) { $info = getimagesize( $imgfile ); $im = null; switch ($info[2]) { case 1: $im=imagecreatefromgif( $imgfile ); break; case 2: $im=imagecreatefromjpeg( $imgfile ); break; case 3: $im=imagecreatefrompng( $imgfile ); break; default:throw new Exception("保存失败!"); break; } return $im; } /** * $imgsrc 图片路径 * $imgdst 生成后的路径 * 生成缩略图 */ function thumb($imgsrc,$w=null,$h=null,$imgdst=null) { $imgdst = $imgdst?$imgdst:$imgsrc; //给变量赋值 list($width,$height,$type) = getimagesize($imgsrc); $new_width = $width>$w?$w:$width; $new_height = $height>$h?$h:$height; switch($type) { case 1: $giftype=check_gifcartoon($imgsrc); if($giftype){ header('Content-Type:image/gif'); $image_wp=imagecreatetruecolor($new_width, $new_height); $image = imagecreatefromgif($imgsrc); imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height); imagejpeg($image_wp, $imgdst,$this->size); imagedestroy($image_wp); } break; case 2: header('Content-Type:image/jpeg'); $image_wp=imagecreatetruecolor($new_width, $new_height); $image = imagecreatefromjpeg($imgsrc); imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height); imagejpeg($image_wp, $imgdst,$this->size); imagedestroy($image_wp); break; case 3: header('Content-Type:image/png'); $image_wp=imagecreatetruecolor($new_width, $new_height); $image = imagecreatefrompng($imgsrc); imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height); imagejpeg($image_wp, $imgdst,$this->size); imagedestroy($image_wp); break; default: throw new Exception("保存失败!"); break; } } function check_gifcartoon($image_file) { $fp = fopen($image_file,'rb'); $image_head = fread($fp,1024); fclose($fp); return preg_match("/".chr(0x21).chr(0xff).chr(0x0b).'NETSCAPE2.0'."/",$image_head)?false:true; } }
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