PHP使用GIFEncoder类生成gif动态滚动字幕


Posted in PHP onJuly 01, 2014

今天在公司,经理让做一个滚动字幕。但是,不许生成gif图片。所以上网找了GIFEncoder这个类库。确实很好用,但是,应用过程中也出现了一些问题,现在写在这里,以供后来人参考,少走弯路。

文字滚动分为两种情况。第一种为水平滚动:

<?php

require_once("GIFEncoder.class.php");

$count=0;   //设置默认计数器

while(true){

    $str = $_REQUEST['str'] ? $_REQUEST['str']:"暂无输入";

    $length=strlen($str)*9;     //计算行长度,这个计算的比较简单,就是每个字数*9个像素

    $im=imagecreatefromgif("hudongbg.gif");     //根据图片创建图像

    $white = ImageColorAllocate($im,255,255,255);       //设置一个白色

    $str = iconv("GB2312","UTF-8",$str);        //特别注意的是转换编码,因为之后用到的imagettftext只能用utf-8编码

    $now=220-$count*5;      //当前运行的水平位置

    imagettftext($im,13,0,$now,20,$white,"ziti.ttf",$str);      //根据字体在图片上写文字,参数意思(图像源,文字大小,倾斜角度,水平位置,垂直位置,颜色,使用的字体文件,要写的内容

    imagegif($im);      

    imagedestroy($im);

    $imagedata[] = ob_get_contents();       //创建这一帧的图像数据

    ob_clean();

    $count++;

    if ($now+$length<0){    //如果最后一个文字移动到头,那么结束

        break;

    }

}

$diy[]=0;//开始延迟时间

$gif = new GIFEncoder($imagedata,$diy,0,2,0,0,0,"bin");

ob_start();

Header ('Content-type:image/gif');

echo $gif->GetAnimation();

?>

然后是垂直的:
<?php

/*

从url获得"str=第一行;第二行;第三行"的数据

*/

require_once("GIFEncoder.class.php");

$array_str=array();

$str=$_GET['str'];

/*

将$str转化成数组

*/

if ($str!=''){

    $array_str=explode(";",$str);

}else{

    $array_str=array("欢迎您光临本店!");

}

/*

如果数组元素没有值,清除最后一个“;”

*/

foreach( $array_str as $k=>$v){

    if( !$v )

    unset( $array_str[$k] );

}

for ($i=0,$length=count($array_str);$i<$length;$i++){

    for ($k=0;$k<20;$k++){

        $im=imagecreatefromgif("hudongbg.gif");     //根据图片创建图像

        $white = ImageColorAllocate($im,255,255,255);       //设置一个白色

        $test = iconv("GB2312","UTF-8",$array_str[$i]);     //特别注意的是转换编码,因为之后用到的imagettftext只能用utf-8编码,注意,一定要用字符串接收,不能用数组,否则会乱码

        $heigth=40-$k;        //当前文字高度

        imagettftext($im,13,0,0,$heigth,$white,"ziti.ttf",$test);        //将文字写入图片

        imagegif($im);

        $imagedata[] = ob_get_contents();

        ob_clean();

    }

}

/*

这里是设置每一张图片的延迟时间,到第20帧的时候,延迟2秒。这样才能出现文字走到顶,停顿一会的效果

*/

$delay=array();

for ($i=1,$length=count($array_str)*20;$i<=$length;$i++){

    if ($i%20==0){

        $delay[$i-1]="200";

    }else{

        $delay[$i-1]="1";

    }

}

$transparent=array(0);

$gif = new GIFEncoder($imagedata,$delay,0,2,0,0,$transparent,"bin");

ob_start();

Header ('Content-type:image/gif');

echo $gif->GetAnimation();

?>

 GIFEncoder类源码:
 

 <?php

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 < 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        );

            $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 >>  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 << 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 {

                    $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 < $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 );

    }

}

?>

 
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