下面贴处理的源代码：
复制代码 代码如下:
require_once(gifencoder.php); //载入编码 文件
$gif = new gifencoder(); //实例化gif解码对象
$gif->load(test.gif); //载入要解码的gif图像
for($i=0;$iimgs[frames]);$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->imgs[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：
复制代码 代码如下:
class gifencoder {
var $gif = gif89a; /* gif header 6 bytes */
var $ver = gifencoder v2.06; /* encoder version */
var $buf = array ( );
var $lop = 0;
var $dis = 2;
var $col = -1;
var $img = -1;
var $err = array (
'err00' =>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 $this->col = ( $gif_red > -1 && $gif_grn > -1 && $gif_blu > -1 ) ?
( $gif_red | ( $gif_grn for ( $i = 0; $i if ( strtolower ( $gif_mod ) == url ) {
$this->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 chr ( ( $d >> 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 chr ( ( $d >> 0 ) & 0xff ) . chr ( ( $d >> 8 ) & 0xff ) . chr ( $j ) . /x0;
break;
}
}
}
switch ( $locals_tmp { 0 } ) {
case !:
$locals_img = substr ( $locals_tmp, 8, 10 );
$locals_tmp = substr ( $locals_tmp, 18, strlen ( $locals_tmp ) - 18 );
break;
case ,:
$locals_img = substr ( $locals_tmp, 0, 10 );
$locals_tmp = substr ( $locals_tmp, 10, strlen ( $locals_tmp ) - 10 );
break;
}
if ( ord ( $this->buf [ $i ] { 10 } ) & 0x80 && $this->img > -1 ) {
if ( $global_len == $locals_len ) {
if ( gifencoder::gifblockcompare ( $global_rgb, $locals_rgb, $global_len ) ) {
$this->gif .= ( $locals_ext . $locals_img . $locals_tmp );
}
else {
$byte = ord ( $locals_img { 9 } );
$byte |= 0x80;
$byte &= 0xf8;
$byte |= ( ord ( $this->buf [ 0 ] { 10 } ) & 0x07 );
$locals_img { 9 } = chr ( $byte );
$this->gif .= ( $locals_ext . $locals_img . $locals_rgb . $locals_tmp );
}
}
else {
$byte = ord ( $locals_img { 9 } );
$byte |= 0x80;
$byte &= 0xf8;
$byte |= ( ord ( $this->buf [ $i ] { 10 } ) & 0x07 );
$locals_img { 9 } = chr ( $byte );
$this->gif .= ( $locals_ext . $locals_img . $locals_rgb . $locals_tmp );
}
}
else {
$this->gif .= ( $locals_ext . $locals_img . $locals_tmp );
}
$this->img = 1;
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: gifaddfooter...
::
*/
function gifaddfooter ( ) {
$this->gif .= ;;
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: gifblockcompare...
::
*/
function gifblockcompare ( $globalblock, $localblock, $len ) {
for ( $i = 0; $i if (
$globalblock { 3 * $i + 0 } != $localblock { 3 * $i + 0 } ||
$globalblock { 3 * $i + 1 } != $localblock { 3 * $i + 1 } ||
$globalblock { 3 * $i + 2 } != $localblock { 3 * $i + 2 }
) {
return ( 0 );
}
}
return ( 1 );
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: gifword...
::
*/
function gifword ( $int ) {
return ( chr ( $int & 0xff ) . chr ( ( $int >> 8 ) & 0xff ) );
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: getanimation...
::
*/
function getanimation ( ) {
return ( $this->gif );
}
}
?>
http://www.bkjia.com/phpjc/824708.htmlwww.bkjia.comtruehttp://www.bkjia.com/phpjc/824708.htmltecharticle下面贴处理的源代码： 复制代码 代码如下: php require_once(gifencoder.php); //载入编码 文件 $gif = new gifencoder(); //实例化gif解码对象 $gif-load(t...