图片缩放水印PHP类
2018-07-20 来源：open-open
/**
* 图片缩放水印类
*
*/
class cls_photo
{
protected $waterrate = 0.2; //水印图标在图片上的比例
protected $width = 300; //缩略图默认宽度
protected $height = 200; //缩略图默认高度
protected $padding = 5; //水印图到边的距离
protected $water_mark = "./water.png";
protected $water_mark_pos = 5;//水印图片位置（1=左上角，2=右上角，3=左下角,4=右下角,5中央）
protected $watermode = 0;// 0缩略图时不打水印 1缩略图时打水印
protected $magick_handle;//图片操作句柄
protected $format = array ( 'jpg','gif','png','jpeg' ); // 图片文件格式限定
protected $smallpic_mode = 2;//默认模式 0为不生成缩略图， 1为裁切缩放 ，2为比例缩放 3为缩放填充模式
/**
* 设置图片类参数
*
* @param $arg 图片参数 多次可放入数组里 如下
* @param $protected 参数值
* array(
* 'waterrate'=>0.2,
* 'water_mark'=>'./water.png',
* 'water_mark_pos'=>4,
* 'smallpic_mode'=>1
* );
* @return ture/false
*/
public function set_args ( $arg,$val="" )
{
$params = array ( 'waterrate','water_mark','water_mark_pos','smallpic_mode','watermode','width','height' );
if ( is_array ( $arg ) )
{
foreach ( $arg as $k =>$v )
{
if ( in_array ( $k,$params ) )
{
$this->$k = $v;
}
}
}
else
{
if ( empty ( $val ) )
{
return false;
}
else
{
if ( in_array ( $arg,$params ) )
{
$this->$arg = $val;
}
}
}
return true;
}
/**
* 图片缩放
*
* @param $src_file 源文件路径
* @param $dst_file 目标文件路径
* @return 缩略图片路径/false
*/
public function scale ( $src_file,$dst_file="" )
{
$dst_width = $this->width;
$dst_height = $this->height;
$mode = $this->smallpic_mode;
$magic_water_handle = NewMagickWand();
if ( !MagickReadImage ( $magic_water_handle, $src_file ) ) return false;
//类型
$srcext = strtolower ( MagickGetImageFormat ( $magic_water_handle ) );
if ( $srcext=='bmp' )
{
$srcext = 'jpeg';
}
if ( !in_array ( $srcext,$this->format ) ) return false;
//尺寸
$src_width = MagickGetImageWidth ( $magic_water_handle );
$src_height = MagickGetImageHeight ( $magic_water_handle );
//裁切缩放模式
if ( $mode == 1 )
{
$pos_x=$pos_y = 0;//裁切临时位置
$src_widthc = $src_width;//裁切临时宽度
$src_heightc = $src_height;//裁切临时高度
if ( $src_width/$src_height>$dst_width/$dst_height )
{
$src_widthc = $src_height*$dst_width/$dst_height;
$pos_x = ( $src_width-$src_widthc ) /2;
}
else
{
$src_heightc = $src_width*$dst_height/$dst_width;
$pos_y = ( $src_height-$src_heightc ) /2;
}
MagickCropImage ( $magic_water_handle,$src_widthc,$src_heightc,$pos_x,$pos_y );//裁切
//因为MagickCropImage函数后，Gif 图像改，但画布不变
$this->magick_handle = NewMagickWand();
MagickNewImage ( $this->magick_handle,$src_widthc,$src_heightc,'#ffffff' );
MagickSetFormat ( $this->magick_handle,$srcext );
MagickCompositeImage ( $this->magick_handle,$magic_water_handle,MW_OverCompositeOp,0,0 );
//缩放
MagickScaleImage ( $this->magick_handle, $dst_width, $dst_height );
}
//比例缩放模式
if ( $mode == 2 )
{
if ( $src_width/$src_height>$dst_width/$dst_height )
{
$dst_height=$dst_width*$src_height/$src_width;
}
else
{
$dst_width=$dst_height*$src_width/$src_height;
}
$this->magick_handle=$magic_water_handle;//替换
MagickScaleImage ( $this->magick_handle, $dst_width, $dst_height );//缩放
}
//缩放填充模式
if ( $mode == 3 )
{
if ( $src_width/$src_height>$dst_width/$dst_height )
{
$dst_heightc=$dst_width*$src_height/$src_width;
$dst_widthc=$dst_width;
}
else
{
$dst_widthc=$dst_height*$src_width/$src_height;
$dst_heightc=$dst_height;
}
MagickScaleImage ( $magic_water_handle, $dst_widthc, $dst_heightc );//缩放
$this->magick_handle = NewMagickWand();
MagickNewImage ( $this->magick_handle,$dst_width,$dst_height,$this->smallpic_bgcolor );
MagickSetFormat ( $this->magick_handle,$srcext );
MagickCompositeImage ( $this->magick_handle,$magic_water_handle,MW_OverCompositeOp, ( $dst_width-$dst_widthc ) /2, ( $dst_height-$dst_heightc ) /2 );
}
//打水印
if ( $this->watermode == 1 )
{
$this->set_mark();
}
if ( empty ( $dst_file ) )
{
//建立临时文件
$dst_file = tempnam ( $_SERVER["SINASRV_CACHE_DIR"],"TMP_IMG" );
}
MagickWriteImage ( $this->magick_handle, $dst_file );
return $dst_file;
}
/**
* 打水印
*
* @param $src_file 要打水印的图片路径
* @param $dst_file 生产水印的文件保存路径，为空则生产随机临时文件
* @return 水印文件路径/false
*/
public function water_mark ( $src_file,$dst_file="" )
{
$this->magick_handle = NewMagickWand();
if ( !MagickReadImage ( $this->magick_handle, $src_file ) )
return false;
$this->set_mark();
if ( empty ( $dst_file ) )
{
//建立临时文件
$dst_file = tempnam ( $_SERVER["SINASRV_CACHE_DIR"],"TMP_IMG" );
}
MagickWriteImage ( $this->magick_handle, $dst_file );
return $dst_file;
}
/**
* 对内接口
* 给图片打水印
*
*/
protected function set_mark()
{
//尺寸
$dst_width = MagickGetImageWidth ( $this->magick_handle );
$dst_height = MagickGetImageHeight ( $this->magick_handle );
//处理水印图
if ( $this->water_mark && is_file ( $this->water_mark ) )
{
$magic_water_handle = NewMagickWand();
MagickRemoveImage ( $magic_water_handle );
if ( MagickReadImage ( $magic_water_handle, $this->water_mark ) )
{
MagickScaleImage ( $magic_water_handle, $dst_width*$this->waterrate, $dst_width*$this->waterrate*MagickGetImageHeight ( $magic_water_handle ) /MagickGetImageWidth ( $magic_water_handle ) );//缩放水印到图片的1/5
if ( $this->water_mark_pos == 1 )
{
$left = $this->padding;
$top = $this->padding;
}
elseif ( $this->water_mark_pos == 2 )
{
$left = $dst_width-$this->padding-MagickGetImageWidth ( $magic_water_handle );
$top = $this->padding;
}
elseif ( $this->water_mark_pos == 3 )
{
$left = $this->padding;
$top = $dst_height -$this->padding-MagickGetImageHeight ( $magic_water_handle );
}
elseif ( $this->water_mark_pos == 4 )
{
$left = $dst_width-$this->padding-MagickGetImageWidth ( $magic_water_handle );
$top =$dst_height -$this->padding-MagickGetImageHeight ( $magic_water_handle );
}
elseif ( $this->water_mark_pos == 5 )
{
$left = ( $dst_width-MagickGetImageWidth ( $magic_water_handle ) ) /2;
$top = ( $dst_height -MagickGetImageHeight ( $magic_water_handle ) ) /2;
}
MagickCompositeImage ( $this->magick_handle,$magic_water_handle,MW_OverCompositeOp,$left,$top );
}
}
}
}
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