PHP相关系列 - PHP 图片处理类
/*********************************************************************************
* InitPHP 2.0 国产PHP开发框架 扩展类库-图片处理类
*-------------------------------------------------------------------------------
* 版权所有: CopyRight By initphp.com
* 您可以自由使用该源码，但是在使用过程中，请保留作者信息。尊重他人劳动成果就是尊重自己
*-------------------------------------------------------------------------------
* $Author:zhuli
* $Dtime:2011-10-09
***********************************************************************************/
class imageInit {
/**
* 图像处理-缩略图处理
* @param string $source 被缩略的图
* @param stirng $newname缩略后的新图
* @param int $width 宽度
* @param int $height 高度
* @param bool $isauto 是否根据原始图片的长宽比自动缩略，true-是的|false-不是
*/
public function make_thumb($source, $newname, $width = 100, $height = 100, $isauto = true) {
if (!file_exists($source)) return false;
$image_info = $this->get_img_info($source); //获取原始图片信息
if ($image_info['type'] == 'bmp') return false;
list($imagecreate, $imagecopyre) = $this->get_image_create($image_info['type']); //获取创建图像和拷贝图像的函数
if (empty($image_info) || !$imagecreate) return false;
/* 画布和原始图创建 */
$thumb = $imagecreate($width, $height); //创建一个图片-画布
$imagecreatefrom = 'imagecreatefrom' .$image_info['type'];
$source = $imagecreatefrom($source);
if(function_exists('ImageColorAllocate') && function_exists('ImageColorTransparent')){
$black = ImageColorAllocate($thumb,0,0,0); //着色
$bgTransparent = ImageColorTransparent($thumb,$black);
}
/* 是否根据原始图片的长宽比自动缩略 */
$src_x = $src_y = 0;
if ($isauto == true) {
if ($image_info['width'] < $image_info['height']) {
$src_y = round(($image_info['height'] - $image_info['width']) / 2);
$image_info['height'] = $image_info['width'];
} else {
$src_x = round(($image_info['width'] - $image_info['height']) / 2);
$image_info['width'] = $image_info['height'];
}
}
/* 拷贝和创建图像 */
$imagecopyre($thumb, $source, 0, 0, $src_x, $src_y, $width, $height, $image_info['width'], $image_info['height']); //拷贝
$result = $this->make($image_info['type'], $thumb, $newname);
if (!$result) return array(); //缩略图创建失败
imagedestroy($thumb);
return array($width, $height);
}
/**
* 图像处理-图片水印
* @param string $source_path 需要生成水印的图片
* @param string $water_path 水印图片位置
* @param string $position 显示的位置：0 随机|1 左上|2 中上|3 右上 |4 左下|5中下|6右下|其它中间
* @param string $pct 水印图片透明度
* @param string $quality 生成图片的品质，0-100，值越大品质越高
* @return bool
*/
public function water_mark($source_path, $water_path, $postion, $pct=100, $quality=100) {
if (!file_exists($source_path) || !file_exists($water_path)) return false;
/* 图片信息 */
$source_info = $this->get_img_info($source_path);
$water_info = $this->get_img_info($water_path);
if ($source_info['type'] == 'bmp' || $water_info['type'] == 'bmp') return false;
if ($source_info['type']) {
$imagecreatefrom = 'imagecreatefrom' .$source_info['type'];
$source = $imagecreatefrom($source_path);
}
if ($water_info['type']) {
$imagecreatefrom = 'imagecreatefrom' .$water_info['type'];
$water = $imagecreatefrom($water_path);
}
/* 处理 */
imagealphablending($source, true); //混色模式
list($x, $y) = $this->get_water_postion($postion, $source_info['width'], $source_info['height'], $water_info['width'], $water_info['height']);
if ($water_info['type'] == 'png') {
$temp = imagecreatetruecolor($source_info['width'], $source_info['height']); //创建着色板
imagecopy($temp, $source, 0, 0, 0, 0, $source_info['width'], $source_info['height']); //将源图拷贝进着色版
imagecopy($temp, $water, $x, $y, 0, 0, $water_info['width'], $water_info['height']); //将水印拷贝进着色办
$source = $temp;
} else {
imagecopymerge($source, $water, $x, $y, 0,0, $water_info['width'], $water_info['height'], $pct); //合并
}
$ext = strtolower(substr(strrchr(basename($source_path), '.'), 1));
$shource_dir = dirname($source_path); //修改水印BUG
$source_path = $shource_dir . '/' . basename($source_path, '.' . $ext);
$this->make($source_info['type'], $source, $source_path, $quality);
imagedestroy($source);
imagedestroy($water);
return true;
}
/**
* 图像处理-获取水印位置
* @param int $position 水印位置
* @param int $source_width 原始图片的宽
* @param int $source_height原始图片的高
* @param int $water_width 水印图片的宽
* @param int $water_height 水印图片的高
* @return array(宽，高)
*/
private function get_water_postion($position, $source_width, $source_height, $water_width, $water_height) {
if ($position == 0) {
$x = rand(0, ($source_width - $water_width));
$y = rand(0, ($source_height - $water_height));
} elseif ($position == 1) {
$x = 5;
$y = 5;
} elseif ($position == 2) {
$x = ($source_width - $water_width) / 2;
$y = 5;
} elseif ($position == 3) {
$x = $source_width - $water_width - 5;
$y = 5;
} elseif ($position == 4) {
$x = 5;
$y = $source_height - $water_height - 5;
} elseif ($position == 5) {
$x = ($source_width - $water_width) / 2;
$y = $source_height - $water_height - 5;
} elseif ($position == 6) {
$x = $source_width - $water_width - 5;
$y = $source_height - $water_height - 5;
} else {
$x = ($source_width - $water_width) / 2;
$y = ($source_height - $water_height) / 2;
}
return array($x, $y);
}
/*
* 图像处理-生成图片
* @param string $type 图片类型
* @param string $image 图片资源
* @param string $filename 图片文件名
* @param int $quality 图片质量,对jpeg有效
* @return bool
*/
private function make($type, $image, $filename, $quality = '75') {
$file_type = ($type !== 'jpeg') ? $type : 'jpg';
$filename = $filename . '.' . $file_type;
$this->createFolder(dirname($filename)); //创建目录
$makeimage = 'image' . $type;
if (!function_exists($makeimage)) {
return false;
}
if ($type == 'jpeg') {
$makeimage($image, $filename, $quality);
} else {
$makeimage($image, $filename);
}
return true;
}
/**
* 图像处理-获取图像信息
* @param string $source 源文件图片
* @return array(图片的宽、高、类型)
*/
private function get_img_info($source) {
$imginfo = array();
$ext = strtolower(substr(strrchr($source, '.'), 1)); //获取图片类型
$image_type = array(1=>'gif', 2=>'jpeg', 3=>'png', 6=>'bmp');
if (function_exists('read_exif_data') && in_array($ext, array('jpg','jpeg','jpe','jfif'))) { //jpeg情况
$temp = @read_exif_data($source);
$imginfo['width'] = $temp['COMPUTED']['Width'];
$imginfo['height'] = $temp['COMPUTED']['Height'];
$imginfo['type'] = 2;
unset($temp);
}
if (empty($imginfo)) { //png,gif,bmp
list($imginfo['width'], $imginfo['height'], $imginfo['type']) = @getimagesize($source);
}
$imginfo['type'] = $image_type[$imginfo['type']];
return $imginfo;
}
/**
* 图像处理-返回图像创建和图像
* 说明：gif和jpeg等函数的图像创建函数不一样
* @param string $imagetype 图像类型-gif、jpeg、png、bmp
* @return array(图像创建函数， 图像拷贝函数)
*/
private function get_image_create($imagetype) {
if ($imagetype != 'gif' && function_exists('imagecreatetruecolor') && function_exists('imagecopyresampled')) {
return array('imagecreatetruecolor','imagecopyresampled');
} elseif (function_exists('imagecreate') && function_exists('imagecopyresized')) {
return array('imagecreate','imagecopyresized');
} else {
return array();
}
}
/**
* 图像处理-创建目录 如果目录存在，则不创建，不存在则创建 static
* @param $path 路径
* @return
*/
public static function createFolder($path) {
if (!is_dir($path)) {
imageInit::createFolder(dirname($path));
@mkdir($path);
@chmod($path, 0777);
@fclose(@fopen($path . '/index.html', 'w'));
@chmod($path . '/index.html', 0777);
}
}
}