PHP使用GIFEncoder类处理gif图片实例

只看该作者 · 发表于 2018-2-14 05:56:42

         下面贴处理的源代码：
[U]复制代码[/U] 代码如下:
load("test.gif");                   //载入要解码的gif图像
for($i=0;$i["frames"]);$i++){    //根据 gif图像的帧数获取每帧的图像数据
$im = imagecreatefromstring($gif->getgif($i));       //利用GD库函数将GIF转得标准些
imagegif($im, $i.".gif");                               //用文件形式保存生成的每帧图像数据，当然也可以用变量
}
imagedestroy($im);
ob_start();
for($i=0;sizeof($gif->["frames"]);$i++){
$im=imagecreatefromgif("0.gif");    //根据每帧的图片创建图像
if($i>0){                                        //不是第一帧复制图片和第一帧合并
   $frame=imagecreatefromgif("$i.gif");       //读取当前帧的图像
      $w = imagesx($frame);                         //获取图像宽度
   $y= imagesy($frame);                         //获取图像高度
      imagecopy($im,$frame,0,0,0,0,$w,$y); //把当前帧图像和第一帧图像复制合并
      imagedestroy($frame);                            //销毁当前图像
}
imagejpeg($im,$i."frame.jpg");    //合并后保存为jpg格式
$im=imagecreatefromjpeg($i."frame.jpg"); //从jpg格式重新创建图像
imagegif($im);                                              //转为gif格式
imagedestroy($im);                                     //销毁图像
$imagedata[] = ob_get_contents();    //创建这一帧的图像数据
ob_clean();
}
$diy[]=0;//开始延迟时间
$gif = new GIFEncoder($imagedata,$diy,0,2,0,0,0,"bin"); //实例化gif编码对象
ob_start();
Header ('Content-type:image/gif');
echo $gif->GetAnimation();
?>
以上代码基本就是一个完整的读取一个gif图片，对其进行解码，然后再编码成gif图片的完整过程了..
有了这个就可以在网上随意抓取gif图片然后进行修改。甚至直接用php就可以自己制作一些gif图片.
GIFEncoder类源码：
[U]复制代码[/U] 代码如下:
"Does not supported function for only one image!",
'ERR01' =>"Source is not a GIF image!",
'ERR02' =>"Unintelligible flag ",
'ERR03' =>"Could not make animation from animated GIF source",
);
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
::       GIFEncoder...
::
*/
function GIFEncoder       (
$GIF_src, $GIF_dly, $GIF_lop, $GIF_dis,
$GIF_red, $GIF_grn, $GIF_blu, $GIF_mod
) {
      if ( ! is_array ( $GIF_src ) && ! is_array ( $GIF_tim ) ) {
         printf       ( "%s: %s", $this->VER, $this->ERR [ 'ERR00' ] );
         exit       ( 0 );
      }
      $this->LOP = ( $GIF_lop > -1 ) ? $GIF_lop : 0;
      $this->DIS = ( $GIF_dis > -1 ) ? ( ( $GIF_dis COL = ( $GIF_red > -1 && $GIF_grn > -1 && $GIF_blu > -1 ) ?
      ( $GIF_red | ( $GIF_grn BUF [ ] = fread ( fopen ( $GIF_src [ $i ], "rb" ), filesize ( $GIF_src [ $i ] ) );
         }
         else if ( strToLower ( $GIF_mod ) == "bin" ) {
            $this->BUF [ ] = $GIF_src [ $i ];
         }
         else {
            printf       ( "%s: %s ( %s )!", $this->VER, $this->ERR [ 'ERR02' ], $GIF_mod );
            exit       ( 0 );
         }
         if ( substr ( $this->BUF [ $i ], 0, 6 ) != "GIF87a" && substr ( $this->BUF [ $i ], 0, 6 ) != "GIF89a" ) {
            printf       ( "%s: %d %s", $this->VER, $i, $this->ERR [ 'ERR01' ] );
            exit       ( 0 );
         }
         for ( $j = ( 13 + 3 * ( 2 BUF [ $i ] { 10 } ) & 0x07 ) ) ), $k = TRUE; $k; $j++ ) {
            switch ( $this->BUF [ $i ] { $j } ) {
                  case "!":
                     if ( ( substr ( $this->BUF [ $i ], ( $j + 3 ), 8 ) ) == "NETSCAPE" ) {
                        printf       ( "%s: %s ( %s source )!", $this->VER, $this->ERR [ 'ERR03' ], ( $i + 1 ) );
                        exit       ( 0 );
                     }
                     break;
                  case ";":
                     $k = FALSE;
                     break;
            }
         }
      }
      GIFEncoder::GIFAddHeader ( );
      for ( $i = 0; $i BUF ); $i++ ) {
         GIFEncoder::GIFAddFrames ( $i, $GIF_dly [ $i ] );
      }
      GIFEncoder::GIFAddFooter ( );
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
::       GIFAddHeader...
::
*/
function GIFAddHeader ( ) {
      $cmap = 0;
      if ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x80 ) {
         $cmap = 3 * ( 2 BUF [ 0 ] { 10 } ) & 0x07 ) );
         $this->GIF .= substr ( $this->BUF [ 0 ], 6, 7             );
         $this->GIF .= substr ( $this->BUF [ 0 ], 13, $cmap       );
         $this->GIF .= "!/377/13NETSCAPE2.0/3/1" . GIFEncoder::GIFWord ( $this->LOP ) . "/0";
      }
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
::       GIFAddFrames...
::
*/
function GIFAddFrames ( $i, $d ) {
      $Locals_str = 13 + 3 * ( 2 BUF [ $i ] { 10 } ) & 0x07 ) );
      $Locals_end = strlen ( $this->BUF [ $i ] ) - $Locals_str - 1;
      $Locals_tmp = substr ( $this->BUF [ $i ], $Locals_str, $Locals_end );
      $Global_len = 2 BUF [ 0  ] { 10 } ) & 0x07 );
      $Locals_len = 2 BUF [ $i ] { 10 } ) & 0x07 );
      $Global_rgb = substr ( $this->BUF [ 0  ], 13,
      3 * ( 2 BUF [ 0  ] { 10 } ) & 0x07 ) ) );
      $Locals_rgb = substr ( $this->BUF [ $i ], 13,
      3 * ( 2 BUF [ $i ] { 10 } ) & 0x07 ) ) );
      $Locals_ext = "!/xF9/x04" . chr ( ( $this->DIS > 0 ) & 0xFF ) . chr ( ( $d >> 8 ) & 0xFF ) . "/x0/x0";
      if ( $this->COL > -1 && ord ( $this->BUF [ $i ] { 10 } ) & 0x80 ) {
         for ( $j = 0; $j BUF [ $i ] { 10 } ) & 0x07 ) ); $j++ ) {
            if       (
            ord ( $Locals_rgb { 3 * $j + 0 } ) == ( $this->COL >>  0 ) & 0xFF &
            ord ( $Locals_rgb { 3 * $j + 1 } ) == ( $this->COL >>  8 ) & 0xFF &
            ord ( $Locals_rgb { 3 * $j + 2 } ) == ( $this->COL >> 16 ) & 0xFF
            ) {
                  $Locals_ext = "!/xF9/x04" . chr ( ( $this->DIS > 0 ) & 0xFF ) . chr ( ( $d >> 8 ) & 0xFF ) . chr ( $j ) . "/x0";
                  break;
            }
         }
      }
      switch ( $Locals_tmp { 0 } ) {
         case "!":
            $Locals_( $Locals_tmp, 8, 10 );
            $Locals_tmp = substr ( $Locals_tmp, 18, strlen ( $Locals_tmp ) - 18 );
            break;
         case ",":
            $Locals_( $Locals_tmp, 0, 10 );
            $Locals_tmp = substr ( $Locals_tmp, 10, strlen ( $Locals_tmp ) - 10 );
            break;
      }
      if ( ord ( $this->BUF [ $i ] { 10 } ) & 0x80 && $this->> -1 ) {
         if ( $Global_len == $Locals_len ) {
            if ( GIFEncoder::GIFBlockCompare ( $Global_rgb, $Locals_rgb, $Global_len ) ) {
                  $this->GIF .= ( $Locals_ext . $Locals_$Locals_tmp );
            }
            else {
                  $byte  = ord ( $Locals_{ 9 } );
                  $byte |= 0x80;
                  $byte &= 0xF8;
                  $byte |= ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x07 );
                  $Locals_{ 9 } = chr ( $byte );
                  $this->GIF .= ( $Locals_ext . $Locals_$Locals_rgb . $Locals_tmp );
            }
         }
         else {
            $byte  = ord ( $Locals_{ 9 } );
            $byte |= 0x80;
            $byte &= 0xF8;
            $byte |= ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 );
            $Locals_{ 9 } = chr ( $byte );
            $this->GIF .= ( $Locals_ext . $Locals_$Locals_rgb . $Locals_tmp );
         }
      }
      else {
         $this->GIF .= ( $Locals_ext . $Locals_$Locals_tmp );
      }
      $this->;
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
::       GIFAddFooter...
::
*/
function GIFAddFooter ( ) {
      $this->GIF .= ";";
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
::       GIFBlockCompare...
::
*/
function GIFBlockCompare ( $GlobalBlock, $LocalBlock, $Len ) {
      for ( $i = 0; $i > 8 ) & 0xFF ) );
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
::       GetAnimation...
::
*/
function GetAnimation ( ) {
      return ( $this->GIF );
}
}
?>



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