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@ -6,24 +6,61 @@ |
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public function thumbnail($source,$width,$height){ |
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public function thumbnail($source,$width,$height){ |
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//获取缩略图名称 |
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//获取缩略图名称 |
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$source = str_replace("\\","/",$source); |
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$source = str_replace("\\","/",$source); |
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$imgarr = explode("/",$source); |
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//获取图片信息 |
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//获取图片信息 |
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$imginfo = getimagesize($source); |
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$imginfo = getimagesize($source); |
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//图片宽 |
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//图片宽 |
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$img_w = $imginfo[0]; |
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$img_w = $imginfo[0]; |
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//图片高 |
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//图片高 |
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$img_h = $imginfo[1]; |
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$img_h = $imginfo[1]; |
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//获取源文件名 |
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$filename = end($imgarr); |
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$imgname = explode(".",$filename); |
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//缩略图名称 |
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$thumbnail_name = $imgname[0].'_thumb'.'.'.$imgname[1]; |
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//获取文件路径 |
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$dirname = dirname($source); //获取的路径最后没有/ |
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//缩略图完整路径 |
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//缩略图完整路径 |
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$thumbnail_full = $dirname.'/'.$thumbnail_name; |
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$thumbnail_full = $this->thumbnailPath($source); |
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$image = new Imagick($source); |
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//原图宽高小于缩略图 |
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if(($img_w <= $width) && ($img_h <= $height)){ |
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return copy($source, $thumbnail_full); |
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} |
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//计算目标图片尺寸,防止挤压变形 |
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$dstSize = $this->dstSize($img_w, $img_h, $width, $height); |
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return $this->gdResize($source, $thumbnail_full, $dstSize['width'], $dstSize['height']); |
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//imagick扩展安装难度较大,先用gd库的方案替代,后期再进行优化 |
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/* |
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//有则用imagick压缩,没有则用gd压缩 |
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if (class_exists('imagick')) { |
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return $this->imagickResize($source, $thumbnail_full, $dstSize['width'], $dstSize['height']); |
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} else { |
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return $this->gdResize($source, $thumbnail_full, $dstSize['width'], $dstSize['height']); |
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}*/ |
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} |
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public function thumbnailPath($file) |
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{ |
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$str = explode(".", $file); |
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return $str[0].'_thumb.'.$str[1]; |
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} |
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//压缩图片 |
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public function compress($source){ |
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} |
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/** |
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* 使用imagick扩展生成缩略图,图片质量更好更方便 |
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* @param $src |
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* @param $dst |
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* @param $width |
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* @param $height |
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*/ |
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/* |
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public function imagickResize($src, $dst, $width, $height) |
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{ |
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$imginfo = getimagesize($src); |
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//图片宽 |
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$img_w = $imginfo[0]; |
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//图片高 |
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$img_h = $imginfo[1]; |
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$image = new Imagick($src); |
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// 创建缩略图 |
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// 创建缩略图 |
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//原图宽高大于缩略图 |
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//原图宽高大于缩略图 |
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if (($img_w > $width) || ($img_h > $height)) { |
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if (($img_w > $width) || ($img_h > $height)) { |
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@ -32,14 +69,108 @@ |
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} |
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} |
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//将缩略图输出到文件 |
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//将缩略图输出到文件 |
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$image->writeImage( $thumbnail_full ); |
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$image->writeImage( $dst ); |
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//清理工作 |
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//清理工作 |
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$image->clear(); |
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$image->clear(); |
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} |
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} |
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//压缩图片 |
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*/ |
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public function compress($source){ |
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/** |
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* 使用gd扩展生成缩略图 |
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* |
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* @param $src |
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* @param $dst |
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* @param $width |
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* @param $height |
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* |
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* @return bool |
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*/ |
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public function gdResize($src, $dst, $width, $height) |
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{ |
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$localInfo = getimagesize($src); |
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//创建图像句柄 |
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$im = $this->gdCreateImg($src, $localInfo[2]); |
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if (!$im) { |
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return false; |
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} |
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$dstSize = $this->dstSize($localInfo[0], $localInfo[1], $width, $height); |
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$dstImage = @imagecreatetruecolor($dstSize["width"], $dstSize["height"]); |
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$whiteColor = @imagecolorallocatealpha($dstImage, 0, 0, 0, 127); |
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imagefill($dstImage, 0, 0, $whiteColor); |
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$re = @imagecopyresampled($dstImage, $im, 0, 0, 0, 0, $dstSize["width"], $dstSize["height"], $localInfo[0], $localInfo[1]); |
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if (!$re) { |
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return false; |
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} |
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if (!$this->gdCreateImgFile($dstImage, $dst, $localInfo[2])) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* 计算目标文件尺寸 |
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* |
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* @param $srcWidth |
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* @param $srcHeight |
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* @param $dstWidth |
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* @param $dstHeight |
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* |
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* @return mixed |
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*/ |
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public function dstSize($srcWidth, $srcHeight, $dstWidth, $dstHeight) |
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{ |
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if (($srcWidth / $srcHeight) < ($dstWidth / $dstHeight)) { |
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$dstWidth = floor($dstHeight * $srcWidth / $srcHeight); |
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} else { |
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$dstHeight = floor($dstWidth * $srcHeight / $srcWidth); |
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} |
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$dstSize["width"] = $dstWidth; |
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$dstSize["height"] = $dstHeight; |
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return $dstSize; |
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} |
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/** |
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* 获取图像对象 |
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* |
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* @param $src |
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* @param $code |
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* |
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* @return bool|resource |
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*/ |
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public function gdCreateImg($src, $code) |
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{ |
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switch ($code) { |
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case 1: |
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return imagecreatefromgif($src); |
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case 2: |
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return imagecreatefromjpeg($src); |
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case 3: |
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return imagecreatefrompng($src); |
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default : |
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return false; |
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} |
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} |
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/** |
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* 生成缩略图文件 |
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* @param $img |
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* @param $path |
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* @param $code |
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* @return bool |
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*/ |
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public function gdCreateImgFile($img, $path, $code) |
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{ |
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switch ($code) { |
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case 1: |
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return imagegif($img, $path); |
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case 2: |
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return imagejpeg($img, $path); |
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case 3: |
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return imagepng($img, $path); |
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default : |
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return false; |
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} |
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} |
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} |
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} |
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} |
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