GIFEncoder.Class.php和无循环GIF动画

时间:2012-11-02 09:21:09

标签: animation loops encoding gif

我正在使用GIFEncoder类将一系列GIF图像转换为动画Gif。

我要做的是设置循环,使其不重复。

当我将循环设置为1时,在Chrome和IE中它不会播放一次...但循环一次(因此播放两次)。在FireFox中,尽管它按预期工作,但播放一个不循环。

这是GIFEncoder中的错误吗?

我做错了吗?

我该如何解决这个问题?

我的代码

$gif = new GIFEncoder   (
                            $frames, // frames array
                            $time, // elapsed time array
                            1, // loops (0 = infinite)
                            0, // disposal
                            3, 2, 1,
                            0,// rgb of transparency
                            "url" // source type
        );

GIFEncoder类

Class GIFEncoder {
    var $GIF = "GIF89a";            /* GIF header 6 bytes   */
    var $VER = "GIFEncoder V3.00";  /* Encoder version              */

    var $BUF = Array ( );
    var $OFS = Array ( );
    var $SIG =  0;
    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'=>"Does 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_ofs,
                                                    $GIF_mod
                                            ) {
            if ( ! is_array ( $GIF_src ) && ! is_array ( $GIF_dly ) ) {
                    printf  ( "%s: %s", $this->VER, $this->ERR [ 'ERR00' ] );
                    exit    ( 0 );
            }
            if ( is_array ( $GIF_ofs ) && count ( $GIF_ofs ) > 1 ) {
                    $this->SIG = 1;
                    $this->OFS = $GIF_ofs;
            }
            $this->LOP = $GIF_lop === false ? false : (( $GIF_lop > -1 ) ? $GIF_lop : 0);
            $this->DIS = ( $GIF_dis > -1 ) ? ( ( $GIF_dis < 3 ) ? $GIF_dis : 3 ) : 2;
            $this->COL = ( $GIF_red > -1 && $GIF_grn > -1 && $GIF_blu > -1 ) ?
                                            ( $GIF_red | ( $GIF_grn << 8 ) | ( $GIF_blu << 16 ) ) : -1;

            for ( $i = 0; $i < count ( $GIF_src ); $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 << ( ord ( $this->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 < count ( $this->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 << ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x07 ) );

                    $this->GIF .= substr ( $this->BUF [ 0 ], 6, 7           );
                    $this->GIF .= substr ( $this->BUF [ 0 ], 13, $cmap      );

                    if($this->LOP !== false)
                    {

                            $this->GIF .= "!\377\13NETSCAPE2.0\3\1" . GIFEncoder::GIFWord ( $this->LOP ) . "\0";
                    }
            }
    }
    /*
    :::::::::::::::::::::::::::::::::::::::::::::::::::
    ::
    ::      GIFAddFrames...
    ::
    */
    function GIFAddFrames ( $i, $d ) {

            $Locals_str = 13 + 3 * ( 2 << ( ord ( $this->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 << ( ord ( $this->BUF [ 0  ] { 10 } ) & 0x07 );
            $Locals_len = 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 );

            $Global_rgb = substr ( $this->BUF [ 0  ], 13,
                                                    3 * ( 2 << ( ord ( $this->BUF [ 0  ] { 10 } ) & 0x07 ) ) );
            $Locals_rgb = substr ( $this->BUF [ $i ], 13,
                                                    3 * ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) ) );

            $Locals_ext = "!\xF9\x04" . chr ( ( $this->DIS << 2 ) + 0 ) .
                                            chr ( ( $d >> 0 ) & 0xFF ) . chr ( ( $d >> 8 ) & 0xFF ) . "\x0\x0";

            if ( $this->COL > -1 && ord ( $this->BUF [ $i ] { 10 } ) & 0x80 ) {
                    for ( $j = 0; $j < ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) ); $j++ ) {
                            if      (
                                            ord ( $Locals_rgb { 3 * $j + 0 } ) == ( ( $this->COL >> 16 ) & 0xFF ) &&
                                            ord ( $Locals_rgb { 3 * $j + 1 } ) == ( ( $this->COL >>  8 ) & 0xFF ) &&
                                            ord ( $Locals_rgb { 3 * $j + 2 } ) == ( ( $this->COL >>  0 ) & 0xFF )
                                    ) {
                                    $Locals_ext = "!\xF9\x04" . chr ( ( $this->DIS << 2 ) + 1 ) .
                                                                    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 {
                                    /*
                                     *
                                     * XY Padding...
                                     *
                                     */
                                    if ( $this->SIG == 1 ) {
                                            $Locals_img { 1 } = chr ( $this->OFS [ $i ] [ 0 ] & 0xFF );
                                            $Locals_img { 2 } = chr ( ( $$this->OFS [ $i ] [ 0 ] & 0xFF00 ) >> 8 );
                                            $Locals_img { 3 } = chr ( $this->OFS [ $i ] [ 1 ] & 0xFF );
                                            $Locals_img { 4 } = chr ( ( $this->OFS [ $i ] [ 1 ] & 0xFF00 ) >> 8 );
                                    }
                                    $byte  = ord ( $Locals_img { 9 } );
                                    $byte |= 0x80;
                                    $byte &= 0xF8;
                                    $byte |= ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x07 );
                                    $Locals_img { 9 } = chr ( $byte );
                                    $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp );
                            }
                    }
                    else {
                            /*
                             *
                             * XY Padding...
                             *
                             */
                            if ( $this->SIG == 1 ) {
                                    $Locals_img { 1 } = chr ( $this->OFS [ $i ] [ 0 ] & 0xFF );
                                    $Locals_img { 2 } = chr ( ( $$this->OFS [ $i ] [ 0 ] & 0xFF00 ) >> 8 );
                                    $Locals_img { 3 } = chr ( $this->OFS [ $i ] [ 1 ] & 0xFF );
                                    $Locals_img { 4 } = chr ( ( $this->OFS [ $i ] [ 1 ] & 0xFF00 ) >> 8 );
                            }
                            $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 < $Len; $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 );
    }
}

2 个答案:

答案 0 :(得分:1)

找到解决方案......只需将循环设置为False

答案 1 :(得分:0)

这门课有错误。请将所有' $$ this-&gt; OFS '替换为' $ this-&gt; OFS '

$gif = new GIFEncoder (

    // 1. frames
    array('1.gif', '2.gif', '3.gif'), 

    // 2. speed - array for frames or number
    //array(500,500,500),
    20,

    // 3. loops - number or false
    0,

    // 4. disposal ??? - what is it?
    2,

    // 5-7. transparent RGB
    0,0,0,

    // 8. padding array with point(x,y) or 0
    array(
        array(0,50),
        array(0,0)
    ),

    // 9. source 'url' or 'bin'
    "url"
);