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【PHP】图片处理
作者:G0561 / 发布于2015/6/25/ 501

	<?php
	
	if(!function_exists("getimagesizefromstring")){
	 function getimagesizefromstring($str, array &$imageinfo = null){
	 $ret = false;
	 $tmpSrc = tempnam(sys_get_temp_dir(),"phpimage_");
	 if(file_put_contents($tmpSrc, $str)){
	 $ret = getimagesize($tmpSrc, $imageinfo);
	 unlink($tmpSrc);
	 }
	 return $ret;
	 }
	}
	/**
	* <pre>
	* Img::get("face/2.jpg")->resize(200,200)->save("screen")->destory();
	* Img::get("face/2.jpg")->thumbnail(200,200)->save("screen")->destory();
	* Img::get("face/2.jpg")->corner()->save("screen")->destory();
	* Img::get("face/2.jpg")->cut(20,20,50,50)->save("screen")->destory();
	* Img::get("face/2.jpg")->rotate(45)->save("screen")->destory();
	* Img::get("face/2.jpg")->draw(Img::get("face/icon.png"), "BR")->save("screen")->destory();
	* </pre>
	* @author zhangheng
	*/
	class Img
	{
	 protected $res;
	 protected $type = null;
	 protected $alphaed = false;
	
	 /**
	 * @return Img
	 */
	 public static function get($src){
	 return new Img($src);
	 }
	
	 function __construct($src=false,$type=false)
	 {
	 if(is_string($src)){
	 if(file_exists($src)){
	 $info = getimagesize($src);
	 if($info){
	 if ($info[2] == IMAGETYPE_JPEG){
	 $this->res = imagecreatefromjpeg($src);
	 }else if($info[2] == IMAGETYPE_PNG){
	 $this->res = @imagecreatefrompng($src);
	 }else if($info[2] == IMAGETYPE_GIF){
	 $this->res = @imagecreatefromgif($src);
	 }else if($info[2] == IMAGETYPE_BMP){
	 $this->res = @imagecreatefromwbmp($src);
	 }
	 $this->type = self::typeStr($info[2]);
	 }
	 }else{
	 if(parse_url($src, PHP_URL_HOST)){
	 $src_ret = file_get_contents($src);
	 $info = getimagesizefromstring($src_ret);
	 if($info){
	 $this->res = @imagecreatefromstring($src_ret);
	 $this->type = self::typeStr($info[2]);
	 }
	 }else{
	 $this->res = @imagecreatefromstring($src);
	 }
	 }
	 }else if(is_array($src) && count($src)>1){
	 if(isset($src[0])){
	 $this->res = imagecreatetruecolor($src[0], $src[1]);
	 }else{
	 $this->res = imagecreatetruecolor($src["width"], $src["height"]);
	 }
	 }else if(is_resource($src)){
	 $this->res = $src;
	 if($type){
	 $this->type = $type;
	 }
	 }else if(get_class($src)==get_class($this)){
	 $this->res = $src->res;
	 $this->type = $src->type;
	 }
	 if(!$this->res){
	 throw new Exception("ArgumentError:".$src);
	 }
	 }
	 private function up($r){
	 @imagedestroy($this->res);
	 $this->res = $r;
	 }
	 /**
	 * 拉伸到目标大小
	 * @param int $width
	 * @param int $height
	 * @return Img
	 */
	 public function resize($width, $height) {
	 $this->up(self::resizeImp($this->res, $width, $height, false, false));
	 return $this;
	 }
	 /**
	 * 生成目标大小缩略图（保持比例）
	 * @param int $width
	 * @param int $height
	 * @return Img
	 */
	 public function thumbnail($width, $height){
	 $this->up(self::resizeImp($this->res, $width, $height, true, true));
	 return $this;
	 }
	 /**
	 * 切图-到目标大小
	 * @param int $x
	 * @param int $y
	 * @param int $w
	 * @param int $h
	 * @return Img
	 */
	 public function cut($x, $y, $width, $height){
	 $img = imagecreatetruecolor($width, $height);
	 imagealphablending($img, false);
	 imagesavealpha($img, true);
	 imagecopy($img, $this->res, 0, 0, $x, $y, $this->width(), $this->height());
	 imagedestroy($this->res);
	 $this->up($img);
	 return $this;
	 }
	 /**
	 * 将图片变成方形（默认以最小边为准）
	 * @param bool $small default-true
	 */
	 public function square($small=TRUE){
	 $w = $this->width();
	 $h = $this->height();
	 if($w != $h){
	 $s = $small ? min(array($w,$h)) : max(array($w,$h));
	 $this->resize($s, $s);
	 }
	 }
	 /**
	 * 制作圆角
	 * @param number $percent 圆角比例
	 * @param string $autoResize 自动调整尺寸（到方形）
	 * @param number $quality 图片质量
	 * @return Img
	 */
	 public function corner($percent=1.0, $autoResize=false, $quality=4){
	 if($autoResize){
	 $this->square();
	 }
	 $w = $this->width();
	 $h = $this->height();
	 $src = $this->res;
	 $radius = min(array($w,$h))/2 * $percent;
	 $radius *= $quality;
	 $nw = $w*$quality;
	 $nh = $h*$quality;
	
	 $img = imagecreatetruecolor($nw, $nh);
	// $alpha = imagecolorallocatealpha($img, 255, 255, 255, 127);
	 $alpha = self::makeColor($img, 0x7fffffff);
	 imagealphablending($img, false);
	 imagesavealpha($img, true);
	 imagefilledrectangle($img, 0, 0, $nw, $nh, $alpha);
	
	 imagefill($img, 0, 0, $alpha);
	 imagecopyresampled($img, $src, 0, 0, 0, 0, $nw, $nh, $w, $h);
	
	 imagearc($img, $radius-1, $radius-1, $radius*2, $radius*2, 180, 270, $alpha);
	 imagefilltoborder($img, 0, 0, $alpha, $alpha);
	 imagearc($img, $nw-$radius, $radius-1, $radius*2, $radius*2, 270, 0, $alpha);
	 imagefilltoborder($img, $nw-1, 0, $alpha, $alpha);
	 imagearc($img, $radius-1, $nh-$radius, $radius*2, $radius*2, 90, 180, $alpha);
	 imagefilltoborder($img, 0, $nh-1, $alpha, $alpha);
	 imagearc($img, $nw-$radius, $nh-$radius, $radius*2, $radius*2, 0, 90, $alpha);
	 imagefilltoborder($img, $nw-1, $nh-1, $alpha, $alpha);
	 imagealphablending($img, true);
	 imagecolortransparent($img, $alpha);
	
	 # resize image down
	 $dest = imagecreatetruecolor($w, $h);
	 imagealphablending($dest, false);
	 imagesavealpha($dest, true);
	 imagefilledrectangle($dest, 0, 0, $w, $h, $alpha);
	 imagecopyresampled($dest, $img, 0, 0, 0, 0, $w, $h, $nw, $nh);
	
	 imagedestroy($src);
	 imagedestroy($img);
	
	 $this->alphaed = true;
	 $this->up($dest);
	 return $this;
	 }
	 /**
	 * 图片旋转
	 * @param float $angle
	 * @param int $gdg_color
	 * @return Img
	 */
	 public function rotate($angle, $gdg_color=0x7fffffff){
	 $this->up(imagerotate($this->res, $angle, $gdg_color));
	 imagealphablending($this->res, true);
	 imagesavealpha($this->res, true); $this->alphaed = true;
	 return $this;
	 }
	 /**
	 *
	 * @param string $fontfile
	 * @param string $text
	 * @param int $offsetX
	 * @param int $offsetY
	 * @param int $size
	 * @param int $angle
	 * @param real $color
	 * @param string $align
	 * @return Img
	 */
	 public function write($fontfile, $text, $offsetX = 0, $offsetY = 0, $size = 14, $color = 0xff0000, $angle = 0, $align = 'BR'){
	 imagealphablending($this->res, true);
	 $box = imagettfbbox($size, $angle, $fontfile, $text);
	 $w = abs($box[2] - $box[0]);
	 $h = abs($box[3] - $box[5]);
	 if($h<$size){
	 $h = $size;
	 }
	 $x = 0;
	 $y = 0;
	 self::align($align, $x, $y, $w, $h, $this->width(), $this->height(), $offsetX, $offsetY);
	 //echo "$x,$y,$w,$h,".$this->width()."_".$this->height();exit();
	 imagettftext($this->res, $size, $angle, $x, $y+$h-3, self::makeColor($this->res, $color), $fontfile, $text);
	 return $this;
	 }
	 /**
	 * 绘制水印图片
	 * @param string $img
	 * @param string $align
	 * @param number $angle
	 * @param number $offsetX
	 * @param number $offsetY
	 * @param real $alpha
	 * @return Img
	 */
	 public function draw($img, $align="BR", $angle=0, $offsetX=0, $offsetY=0, $alpha=1.0){
	 $img = new Img($img);
	 if($angle!=0){
	 $img->rotate($angle);
	 }
	 $w = $img->width();
	 $h = $img->height();
	 $x = 0;
	 $y = 0;
	 self::align($align, $x, $y, $w, $h, $this->width(), $this->height(), $offsetX, $offsetY);
	 imagealphablending($this->res, true);
	 imagecopy($this->res, $img->res, $x, $y, 0, 0, $w, $h);//拷贝水印到目标文件
	 return $this;
	 }
	 private static function align($align, &$x, &$y, $w, $h, $bw, $bh, $offsetX, $offsetY){
	 if($align=="BR"){
	 $x = ($bw-$w-$offsetX);
	 $y = ($bh-$h-$offsetY);
	 } else if($align=="BL"){
	 $x = $offsetX;
	 $y = ($bh-$h-$offsetY);
	 } else if($align=="TL"){
	 $x = $offsetX;
	 $y = $offsetY;
	 } else if($align=="TR"){
	 $x = ($bw-$w-$offsetX);
	 $y = $offsetY;
	 } else{
	 $x = ($bw-$w-$offsetX)/2;
	 $y = ($bh-$h-$offsetY)/2;
	 }
	 }
	 /**
	 * 当前素材宽度
	 * @return number
	 */
	 public function width()
	 {
	 return imagesx($this->res);
	 }
	 /**
	 * 当前素材高度
	 * @return number
	 */
	 public function height()
	 {
	 return imagesy($this->res);
	 }
	 /**
	 * 当前素材resource
	 * @return resource
	 */
	 public function res(){
	 return $this->res;
	 }
	 /**
	 * 保存到文件
	 * @param string $file
	 * @param string $type
	 * @return Img
	 */
	 public function save($file,$type=null){
	 if($type==null){
	 $type = $this->type;
	 if($this->alphaed){
	 $type = "png";
	 }
	 }
	 self::saveTo($this->res, $file, $type);
	 return $this;
	 }
	 /**
	 * 销毁当前图
	 */
	 public function destory(){
	 if($this->res){
	 @imagedestroy($this->res);
	 $this->res = false;
	 }
	 }
	 /**
	 * 保存ImageResource到文件
	 * @param resource $image
	 * @param string $file
	 * @param string $type
	 */
	 private static function saveTo($image,$file,$type="jpg"){
	 if($file=="screen"){
	 $file = null;
	 header("content-type: image/".$type);
	 }
	 if($type=="png"){
	 imagepng($image, $file);
	 }else if($type=="gif"){
	 $transColor = imagecolorallocatealpha($image, 255, 255, 255, 127);
	 imagecolortransparent($image, $transColor);
	 imagegif($image, $file);
	 }else{
	 imagejpeg($image, $file, 100);
	 }
	 }
	 /**
	 * @param string $src 图片文件文件
	 * @param int $width 目标尺寸
	 * @param int $height 目标尺寸
	 * @param string $toFile 缩放后存储文件，如果不设置则会覆盖源图路径
	 * @param boolean $ratio 保持比例
	 * @param boolean $thumbnail 如果为false支持等比放大 true则只支持等比从大到小
	 */
	 private static function resizeImp($res, $width, $height, $ratio=TRUE, $thumbnail=FALSE){
	 $oldW = imagesx($res);
	 $oldH = imagesy($res);
	 self::scale($width, $height, $oldW, $oldH, $ratio, $thumbnail);
	
	 $img = imagecreatetruecolor($width, $height);
	 $alpha = imagecolorallocatealpha($img, 255, 255, 255, 127);
	 imagefill($img, 0, 0, $alpha);
	 imagecopyresampled($img, $res, 0, 0, 0, 0, $width, $height, $oldW, $oldH);
	 imagesavealpha($img, true);
	 return $img;
	 }
	 /**
	 * 根据是否保持比例是否缩略图，计算缩放后的真实尺寸
	 * @param int $toWidth toWidth
	 * @param int $toHeight toHeight
	 * @param int $srcWidth srcWidth
	 * @param int $srcHeight srcHeight
	 * @param boolean $ratio 保持比例
	 * @param boolean $thumbnail 如果为false支持等比放大 true则只支持等比从大到小
	 */
	 private static function scale(&$toWidth,&$toHeight,$srcWidth,$srcHeight, $ratio=TRUE, $thumbnail=FALSE){
	 if($ratio || $thumbnail){
	 if($thumbnail && ($srcWidth<$toWidth && $srcHeight<$toHeight)){
	 $toWidth = $srcWidth;
	 $toHeight = $srcHeight;
	 }else{
	 if (($toWidth/$toHeight) <= ($srcWidth/$srcHeight)){
	 $toHeight = intval($toWidth * ($srcHeight / $srcWidth));
	 }else{
	 $toWidth = intval($toHeight * ($srcWidth / $srcHeight));
	 }
	 }
	 }
	 }
	 private static function makeColor($img, $rgba){
	 $b = $rgba&0xff;
	 $rgba >>= 8;
	 $g = ($rgba)&0xff;
	 $rgba >>= 8;
	 $r = ($rgba)&0xff;
	 $rgba >>= 8;
	 $a = ($rgba)&0xff;
	 $c = imagecolorallocatealpha($img, $r, $g, $b, $a);
	 if($rgba==0x7fffffff){
	 imagecolortransparent($img, $c);
	 }
	 return $c;
	 }
	 private static function typeStr($type){
	 if($type == IMAGETYPE_PNG){
	 $type = "png";
	 }else if($type == IMAGETYPE_GIF){
	 return "gif";
	 }else if($type == IMAGETYPE_BMP){
	 return "bmp";
	 }
	 return "jpg";
	 }
	}
	
	?>
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