php 图片处理

缩略图、旋转、截

缩略图、旋转、截取、水印、圆角

<?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 class="brush:php;toolbar:false">
 *      Img::get("face/2.jpg")->resize(200,200)->save()->destory();
 *      Img::get("face/2.jpg")->thumbnail(200,200)->save()->destory();
 *      Img::get("face/2.jpg")->corner()->save()->destory();
 *      Img::get("face/2.jpg")->cut(20,20,50,50)->save()->destory();
 *      Img::get("face/2.jpg")->rotate(45)->save()->destory();
 *      Img::get("face/2.jpg")->draw(Img::get("face/icon.png"), "BR")->save("face/2_logo.jpg")->destory();
 * 

* @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=false) { $this->up(self::resizeImp($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=false){ $this->up(self::resizeImp($this->res, $width, $height, true, true)); return $this; } /** * 限定最小一边-大小为$size, 并且保持比例 * @param int $size */ public function thumbByMin($size){ $w = $this->width(); $h = $this->height(); if($w==$h){ $w = $size; $h = $size; }else if($w>$h){ $w = $w/$h*$size; $h = $size; }else{ $h = $h/$w*$size; $w = $size; } $this->up(self::resizeImp($this->res, $w, $h, false, false)); 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); } return $this; } /** * 方形剪切 * @param int $size 剪切后缩放到目标大小 * @return Img */ public function squareCut($size=false){ $w = $this->width(); $h = $this->height(); if($w != $h){ $s = min(array($w,$h)); $x = ($w-$s)/2; $y = ($h-$s)/2; $this->cut($x, $y, $s, $s); } if(is_int($size) && $size>0){ $this->resize($size); } return $this; } /** * 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(!$file || empty($file)){ $file = null; header("content-type: image/".$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, $thumbnail=FALSE){ if($height===false){ $height = $width; } $oldW = imagesx($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($type == IMAGETYPE_PNG){ return "png"; }else if($type == IMAGETYPE_GIF){ return "gif"; }else if($type == IMAGETYPE_BMP){ return "bmp"; } return "jpg"; } } ?>