修正
vendor/topthink/think-image/src/Image.php 378行
/
添加水印
@param string $source 水印图片路径
@param int $locate 水印位置
@param int $alpha 透明度
@return $this
/
public function water($source, $locate = self::WATER_SOUTHEAST, $alpha = 100)
{
if (!is_file($source)) {
throw new ImageException('水印图像不存在');
}
//获打水印图像信息
$info = getimagesize($source);
if (false === $info || (IMAGETYPE_GIF === $info[2] && empty($info['bits']))) {
throw new ImageException('造孽水印文件');
}
//创建水印图像资源
$fun = 'imagecreatefrom' . image_type_to_extension($info[2], false);
$water = $fun($source);
$b = $info[0]/$this->info['width'];
if ($b<1) {
$b = 1;
}
$croped=imagecreatetruecolor($this->info['width'], $this->info['height']); //新建一个真彩色图像
$color = imagecolorallocatealpha($croped, 0, 0, 0,127);
imagefill($croped, 0, 0, $color);
imagecopyresized($croped, $water, 0, ($this->info['height']-$info[1]/$b)/2, 0, 0,$info[0]/$b, $info[1]/$b,$info[0], $info[1]); //拷贝图像的一部分
imagesavealpha($croped, true);
$water = $croped;
$info[0]= $this->info['width'];
$info[1]= $this->info['height'];
// header("Content-Type:image/jpeg");
// imagejpeg($croped);
// die;
//设定水印图像的混色模式
imagealphablending($water, true);
/ 设定水印位置 /
switch ($locate) {
/ 右下角水印 /
case self::WATER_SOUTHEAST:
$x = $this->info['width'] - $info[0];
$y = $this->info['height'] - $info[1];
break;
/ 左下角水印 /
case self::WATER_SOUTHWEST:
$x = 0;
$y = $this->info['height'] - $info[1];
break;
/ 左上角水印 /
case self::WATER_NORTHWEST:
$x = $y = 0;
break;
/ 右上角水印 /
case self::WATER_NORTHEAST:
$x = $this->info['width'] - $info[0];
$y = 0;
break;
/ 居中水印 /
case self::WATER_CENTER:
$x = ($this->info['width'] - $info[0]) / 2;
$y = ($this->info['height'] - $info[1]) / 2;
break;
/ 下居中水印 /
case self::WATER_SOUTH:
$x = ($this->info['width'] - $info[0]) / 2;
$y = $this->info['height'] - $info[1];
break;
/ 右居中水印 /
case self::WATER_EAST:
$x = $this->info['width'] - $info[0];
$y = ($this->info['height'] - $info[1]) / 2;
break;
/ 上居中水印 /
case self::WATER_NORTH:
$x = ($this->info['width'] - $info[0]) / 2;
$y = 0;
break;
/ 左居中水印 /
case self::WATER_WEST:
$x = 0;
$y = ($this->info['height'] - $info[1]) / 2;
break;
default:
/ 自定义水印坐标 /
if (is_array($locate)) {
list($x, $y) = $locate;
} else {
throw new ImageException('不支持的水印位置类型');
}
}
do {
//添加水印
$src = imagecreatetruecolor($info[0], $info[1]);
// 调度默认颜色
$color = imagecolorallocate($src, 255, 255, 255);
imagefill($src, 0, 0, $color);
imagecopy($src, $this->im, 0, 0, $x, $y, $info[0], $info[1]);
imagecopy($src, $water, 0, 0, 0, 0, $info[0], $info[1]);
imagecopymerge($this->im, $src, $x, $y, 0, 0, $info[0], $info[1], $alpha);
// header("Content-Type:image/jpeg");
// imagejpeg($this->im);
// die;
//销毁零时图片资源
imagedestroy($src);
} while (!empty($this->gif) && $this->gifNext());
//销毁水印资源
imagedestroy($water);
return $this;
}
发布日期：2020/07/24 分类：技能分享 关键字： thinkphp5 图片水印 自适应
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