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chorblack
2026-03-07 11:19:25 +08:00
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<?php
class WaterMark{
private $im_src; // 背景图文件
private $im_src_width; // 背景图宽度
private $im_src_height; // 背景图高度
private $src_im; // 由背景图创建的新图
private $im_water; // 水印图文件
private $im_water_width; // 水印图宽度
private $im_water_height; // 水印图高度
private $water_im; // 由水印图创建的新图
private $font; // 字体库
private $font_text; // 文本
private $font_size; // 字体大小
private $font_color; // 字体颜色
private $type; //类型
private $mime;
function setImSrc($img,$width = 0){
$this->im_src = $img;
//读取背景图片文件
$srcInfo = @getimagesize($this->im_src);
$this->im_src_width = $srcInfo[0];
$this->im_src_height = $srcInfo[1];
$this->type = $srcInfo[2];
$this->mime = $srcInfo['mime'];
//取得背景图片
$this->src_im = $this->getType($this->im_src, $srcInfo[2]);
if($width){
$this->resize($width);
}
}
function setImWater($img){
$this->im_water = $img;
//读取水印图片文件
$waterInfo = @getimagesize($this->im_water);
$this->im_water_width = $waterInfo[0];
$this->im_water_height = $waterInfo[1];
//取得水印图片
$this->water_im = $this->getType($this->im_water, $waterInfo[2]);
}
function setFont($font, $text, $size, $color){
$this->font = $font;
$this->font_text = $text;
$this->font_size = $size;
//水印文字颜色（'255,255,255'）
$this->font_color = $color;
}
/**
* 根据文件或URL创建一个新图象
* @param $img
* @param $type
* @return resource
*/
function getType($img, $type){
switch($type){
case 1:
$im = imagecreatefromgif($img);
break;
case 2:
$exif = exif_read_data($img, 'EXIF');
$im = imagecreatefromjpeg($img);
if($exif!=false){
switch($exif['Orientation']) {
case 8:
$im = imagerotate($im,90,0);
break;
case 3:
$im = imagerotate($im,180,0);
break;
case 6:
$im = imagerotate($im,-90,0);
break;
}
}
break;
case 3:
$im = imagecreatefrompng($img);
imagesavealpha($im, true);
break;
default:break;
}
return $im;
}
/**
* 根据位置及水印宽高，获取打印的x/y坐标
* @param $pos
* @param $w
* @param $h
*/
function getPos($pos, $w, $h)
{
switch($pos){
case 0://随机
$posX = rand(0, ($this->im_src_width - $w));
$posY = rand(0, ($this->im_src_height - $h));
break;
case 1://1为顶端居左
$posX = 0;
$posY = 0;
break;
case 2://2为顶端居中
$posX = ceil($this->im_src_width - $w) / 2;
$posY = 0;
break;
case 3://3为顶端居右
$posX = $this->im_src_width - $w;
$posY = 0;
break;
case 4://4为中部居左
$posX = 0;
$posY = ceil($this->im_src_height - $h) / 2;
break;
case 5://5为中部居中
$posX = ceil($this->im_src_width - $w) / 2;
$posY = ceil($this->im_src_height - $h) / 2;
break;
case 6://6为中部居右
$posX = $this->im_src_width - $w;
$posY = ceil($this->im_src_height - $h) / 2;
break;
case 7://7为底端居左
$posX = 0;
$posY = $this->im_src_height - $h;
break;
case 8://8为底端居中
$posX = ceil($this->im_src_width - $w) / 2;
$posY = $this->im_src_height - $h;
break;
case 9://9为底端居右
$posX = $this->im_src_width - $w;
$posY = $this->im_src_height - $h;
break;
default://随机
$posX = rand(0,($this->im_src_width - $w));
$posY = rand(0,($this->im_src_height - $h));
break;
}
return array($posX, $posY);
}
/**
* 校验尺寸
* @param $w
* @param $h
* @return boolean
*/
function check_range($w, $h){
if( ($this->im_src_width < $w) || ($this->im_src_height < $h) ){
return false;
}
return true;
}
/**
* 打水印操作
* @param $is_image 是1否0水印图片
* @param $image_pos 水印图片位置（0~9）
* @param $is_text 是1否0水印文字
* @param $text_pos 水印文字位置（0~9）
*/
function mark($is_image=0, $image_pos=0, $is_text=0, $text_pos=0, $mic_x=0, $mic_y=0, $alpha=0, $save=FALSE){
// 水印图片情况
if ($is_image)
{
// 校验图片大小，太小无法加水印直接返回
if (!$this->check_range($this->im_water_width, $this->im_water_height)){
$this->show();
$this->clean();
return;
}
$posArr = $this->getPos($image_pos, $this->im_water_width, $this->im_water_height);
$posX = $posArr[0];
$posY = $posArr[1];
// 拷贝水印到目标文件
if($alpha){
$this->imagecopymerge_alpha($this->src_im, $this->water_im, $posX, $posY, 0, 0, $this->im_water_width, $this->im_water_height, $alpha);
}else{
imagecopy($this->src_im, $this->water_im, $posX, $posY, 0, 0, $this->im_water_width, $this->im_water_height);
}
}
// 水印文字情况
if ($is_text){
//取得此字体的文本的范围
$temp = imagettfbbox($this->font_size, 0, $this->font, $this->font_text);
$w = $temp[2] - $temp[0];
$h = $temp[1] - $temp[7];
unset($temp);
// 校验图片大小，太小无法加水印直接返回
if (!$this->check_range($w, $h)){
$this->show();
$this->clean();
return;
}
$posArr = $this->getPos($text_pos, $w, $h);
$posX = $posArr[0]+$mic_x;
$posY = $posArr[1]+$mic_y;
// 打印文本
$rgb = explode(',', $this->font_color);
if (count($rgb) != 3){
$rgb = $this->hex2rgb($this->font_color);
file_put_contents('log.txt',$this->font_color);
$color = imagecolorallocate($this->src_im, $rgb['r'], $rgb['g'], $rgb['b']);
}else{
$color = imagecolorallocate($this->src_im, $rgb[0], $rgb[1], $rgb[2]);
}
imagettftext($this->src_im, $this->font_size, 0, $posX, $posY, $color, $this->font, $this->font_text);
}
// 输出
$this->show();
if($save){
$this->save($save);
}
// 清理
$this->clean();
}
/**
* 输出图像
*/
function show() {
ob_clean();
header("Content-type: {$this->mime}; charset=UTF-8");
switch ($this->type){
case 1:
imagegif($this->src_im);
break;
case 2:
imagejpeg($this->src_im);
break;
default :
imagepng($this->src_im);
}
}
/**
* 存储图像
*/
function save($file){
switch ($this->type){
case 1:
imagegif($this->src_im,$file);
break;
case 2:
imagejpeg($this->src_im,$file);
break;
default :
imagepng($this->src_im,$file);
}
}
/**
* 清理
*/
function clean(){
imagedestroy($this->water_im);
imagedestroy($this->src_im);
}
/**
* 将十六进制颜色转为RGB
* @param type $hexColor
* @return array
*/
function hex2rgb($hexColor) {
$color = substr($hexColor,1);
if (strlen($color) > 3) {
$rgb = array(
'r' => hexdec(substr($color, 0, 2)),
'g' => hexdec(substr($color, 2, 2)),
'b' => hexdec(substr($color, 4, 2))
);
} else {
$color = $hexColor;
$r = substr($color, 0, 1) . substr($color, 0, 1);
$g = substr($color, 1, 1) . substr($color, 1, 1);
$b = substr($color, 2, 1) . substr($color, 2, 1);
$rgb = array(
'r' => hexdec($r),
'g' => hexdec($g),
'b' => hexdec($b)
);
}
return $rgb;
}
function imagecopymerge_alpha($dst_im, $src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h, $pct){
$opacity=$pct;
// getting the watermark width
$w = imagesx($src_im);
// getting the watermark height
$h = imagesy($src_im);
// creating a cut resource
$cut = imagecreatetruecolor($src_w, $src_h);
// copying that section of the background to the cut
imagecopy($cut, $dst_im, 0, 0, $dst_x, $dst_y, $src_w, $src_h);
// inverting the opacity
$opacity = 100 - $opacity;
// placing the watermark now
imagecopy($cut, $src_im, 0, 0, $src_x, $src_y, $src_w, $src_h);
imagecopymerge($dst_im, $cut, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h, $opacity);
}
/**
* 重设图片大小
*
* @param type $maxwidth
*/
function resize($maxwidth=600){
$im = $this->src_im;
$width = imagesx($im);
$height = imagesy($im);
if($maxwidth && $width > $maxwidth){
$ratio = $maxwidth/$width;
$this->im_src_width = $width * $ratio;
$this->im_src_height = $height * $ratio;
if(function_exists("imagecopyresampled")){
$newim = imagecreatetruecolor($this->im_src_width , $this->im_src_height);
if(3 === $this->type){
imagealphablending($newim, false);
imagesavealpha($newim, true);
}
imagecopyresampled($newim, $im, 0, 0, 0, 0, $this->im_src_width , $this->im_src_height, $width, $height);
}else{
$newim = imagecreate($this->im_src_width , $this->im_src_height);
if(3 === $this->type){
imagealphablending($newim, false);
imagesavealpha($newim, true);
}
imagecopyresized($newim, $im, 0, 0, 0, 0, $this->im_src_width , $this->im_src_height, $width, $height);
}
$this->src_im = $newim;
}
}
}
?>