PHP使用GIFEncoder类生成gif动态滚动字幕_php实例

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：

<br /><?php<br />require_once("GIFEncoder.class.php");<br />$count=0;   //设置默认计数器<br />while(true){<br />    $str = $_REQUEST['str'] ? $_REQUEST['str']:"暂无输入";<br />    $length=strlen($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<br />    $im=imagecreatefromgif("hudongbg.gif");     //根据图片创建图像<br />    $white = ImageColorAllocate($im,255,255,255);       //设置一个白色<br />    $str = iconv("GB2312","UTF-8",$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<br />    $now=220-$count*5;      //当前运行的水平位置<br />    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<br />    imagegif($im);      <br />    imagedestroy($im);<br />    $imagedata[] = ob_get_contents();       //创建这一帧的图像数据<br />    ob_clean();<br />    $count++;<br />    if ($now+$length<0){    //如果最后一个文字移动到头，那么结束<br />        break;<br />    }<br />}<br />$diy[]=0;//开始延迟时间<br />$gif = new GIFEncoder($imagedata,$diy,0,2,0,0,0,"bin");<br />ob_start();<br />Header ('Content-type:image/gif');<br />echo $gif->GetAnimation();<br />?><br />

然后是垂直的：

<br /><?php<br />/*<br />从url获得"str=第一行;第二行;第三行"的数据<br />*/<br />require_once("GIFEncoder.class.php");<br />$array_str=array();<br />$str=$_GET['str'];<br />/*<br />将$str转化成数组<br />*/<br />if ($str!=''){<br />    $array_str=explode(";",$str);<br />}else{<br />    $array_str=array("欢迎您光临本店！");<br />}<br />/*<br />如果数组元素没有值，清除最后一个“;”<br />*/<br />foreach( $array_str as $k=>$v){<br />    if( !$v )<br />    unset( $array_str[$k] );<br />}<br />for ($i=0,$length=count($array_str);$i<$length;$i++){<br />    for ($k=0;$k<20;$k++){<br />        $im=imagecreatefromgif("hudongbg.gif");     //根据图片创建图像<br />        $white = ImageColorAllocate($im,255,255,255);       //设置一个白色<br />        $test = iconv("GB2312","UTF-8",$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<br />        $heigth=40-$k;        //当前文字高度<br />        imagettftext($im,13,0,0,$heigth,$white,"ziti.ttf",$test);        //将文字写入图片<br />        imagegif($im);<br />        $imagedata[] = ob_get_contents();<br />        ob_clean();<br />    }<br />}<br />/*<br />这里是设置每一张图片的延迟时间，到第20帧的时候，延迟2秒。这样才能出现文字走到顶，停顿一会的效果<br />*/<br />$delay=array();<br />for ($i=1,$length=count($array_str)*20;$i<=$length;$i++){<br />    if ($i%20==0){<br />        $delay[$i-1]="200";<br />    }else{<br />        $delay[$i-1]="1";<br />    }<br />}<br />$transparent=array(0);<br />$gif = new GIFEncoder($imagedata,$delay,0,2,0,0,$transparent,"bin");<br />ob_start();<br />Header ('Content-type:image/gif');<br />echo $gif->GetAnimation();<br />?><br />

GIFEncoder类源码：

<br /> <?php<br />Class GIFEncoder {<br />    var $GIF = "GIF89a";                /* GIF header 6 bytes        */<br />    var $VER = "GIFEncoder V2.06";        /* Encoder version                */<br />    var $BUF = Array ( );<br />    var $LOP =  0;<br />    var $DIS =  2;<br />    var $COL = -1;<br />    var $IMG = -1;<br />    var $ERR = Array (<br />    'ERR00' =>"Does not supported function for only one image!",<br />    'ERR01' =>"Source is not a GIF image!",<br />    'ERR02' =>"Unintelligible flag ",<br />    'ERR03' =>"Could not make animation from animated GIF source",<br />    );<br />    /*<br />    :::::::::::::::::::::::::::::::::::::::::::::::::::<br />    ::<br />    ::        GIFEncoder...<br />    ::<br />    */<br />    function GIFEncoder        (<br />    $GIF_src, $GIF_dly, $GIF_lop, $GIF_dis,<br />    $GIF_red, $GIF_grn, $GIF_blu, $GIF_mod<br />    ) {<br />        if ( ! <a>本2文来*源gao($daima.com搞@代@#码(网</a><strong>搞gaodaima代码</strong>is_array ( $GIF_src ) && ! is_array ( $GIF_tim ) ) {<br />            printf        ( "%s: %s", $this->VER, $this->ERR [ 'ERR00' ] );<br />            exit        ( 0 );<br />        }<br />        $this->LOP = ( $GIF_lop > -1 ) ? $GIF_lop : 0;<br />        $this->DIS = ( $GIF_dis > -1 ) ? ( ( $GIF_dis < 3 ) ? $GIF_dis : 3 ) : 2;<br />        $this->COL = ( $GIF_red > -1 && $GIF_grn > -1 && $GIF_blu > -1 ) ?<br />        ( $GIF_red | ( $GIF_grn << 8 ) | ( $GIF_blu << 16 ) ) : -1;<br />        for ( $i = 0; $i < count ( $GIF_src ); $i++ ) {<br />            if ( strToLower ( $GIF_mod ) == "url" ) {<br />                $this->BUF [ ] = fread ( fopen ( $GIF_src [ $i ], "rb" ), filesize ( $GIF_src [ $i ] ) );<br />            }<br />            else if ( strToLower ( $GIF_mod ) == "bin" ) {<br />                $this->BUF [ ] = $GIF_src [ $i ];<br />            }<br />            else {<br />                printf        ( "%s: %s ( %s )!", $this->VER, $this->ERR [ 'ERR02' ], $GIF_mod );<br />                exit        ( 0 );<br />            }<br />            if ( substr ( $this->BUF [ $i ], 0, 6 ) != "GIF87a" && substr ( $this->BUF [ $i ], 0, 6 ) != "GIF89a" ) {<br />                printf        ( "%s: %d %s", $this->VER, $i, $this->ERR [ 'ERR01' ] );<br />                exit        ( 0 );<br />            }<br />            for ( $j = ( 13 + 3 * ( 2 <BUF [ $i ] { 10 } ) & 0x07 ) ) ), $k = TRUE; $k; $j++ ) {<br />                switch ( $this->BUF [ $i ] { $j } ) {<br />                    case "!":<br />                        if ( ( substr ( $this->BUF [ $i ], ( $j + 3 ), 8 ) ) == "NETSCAPE" ) {<br />                            printf        ( "%s: %s ( %s source )!", $this->VER, $this->ERR [ 'ERR03' ], ( $i + 1 ) );<br />                            exit        ( 0 );<br />                        }<br />                        break;<br />                    case ";":<br />                        $k = FALSE;<br />                        break;<br />                }<br />            }<br />        }<br />        GIFEncoder::GIFAddHeader ( );<br />        for ( $i = 0; $i BUF ); $i++ ) {<br />            GIFEncoder::GIFAddFrames ( $i, $GIF_dly [ $i ] );<br />        }<br />        GIFEncoder::GIFAddFooter ( );<br />    }<br />    /*<br />    :::::::::::::::::::::::::::::::::::::::::::::::::::<br />    ::<br />    ::        GIFAddHeader...<br />    ::<br />    */<br />    function GIFAddHeader ( ) {<br />        $cmap = 0;<br />        if ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x80 ) {<br />            $cmap = 3 * ( 2 <BUF [ 0 ] { 10 } ) & 0x07 ) );<br />            $this->GIF .= substr ( $this->BUF [ 0 ], 6, 7                );<br />            $this->GIF .= substr ( $this->BUF [ 0 ], 13, $cmap        );<br />            $this->GIF .= "!/377/13NETSCAPE2.0/3/1" . GIFEncoder::GIFWord ( $this->LOP ) . "/0";<br />        }<br />    }<br />    /*<br />    :::::::::::::::::::::::::::::::::::::::::::::::::::<br />    ::<br />    ::        GIFAddFrames...<br />    ::<br />    */<br />    function GIFAddFrames ( $i, $d ) {<br />        $Locals_str = 13 + 3 * ( 2 <BUF [ $i ] { 10 } ) & 0x07 ) );<br />        $Locals_end = strlen ( $this->BUF [ $i ] ) - $Locals_str - 1;<br />        $Locals_tmp = substr ( $this->BUF [ $i ], $Locals_str, $Locals_end );<br />        $Global_len = 2 <BUF [ 0  ] { 10 } ) & 0x07 );<br />        $Locals_len = 2 <BUF [ $i ] { 10 } ) & 0x07 );<br />        $Global_rgb = substr ( $this->BUF [ 0  ], 13,<br />        3 * ( 2 <BUF [ 0  ] { 10 } ) & 0x07 ) ) );<br />        $Locals_rgb = substr ( $this->BUF [ $i ], 13,<br />        3 * ( 2 <BUF [ $i ] { 10 } ) & 0x07 ) ) );<br />        $Locals_ext = "!/xF9/x04" . chr ( ( $this->DIS << 2 ) + 0 ) .<br />        chr ( ( $d >> 0 ) & 0xFF ) . chr ( ( $d >> 8 ) & 0xFF ) . "/x0/x0";<br />        if ( $this->COL > -1 && ord ( $this->BUF [ $i ] { 10 } ) & 0x80 ) {<br />            for ( $j = 0; $j < ( 2 <BUF [ $i ] { 10 } ) & 0x07 ) ); $j++ ) {<br />                if        (<br />                ord ( $Locals_rgb { 3 * $j + 0 } ) == ( $this->COL >>  0 ) & 0xFF &<br />                ord ( $Locals_rgb { 3 * $j + 1 } ) == ( $this->COL >>  8 ) & 0xFF &<br />                ord ( $Locals_rgb { 3 * $j + 2 } ) == ( $this->COL >> 16 ) & 0xFF<br />                ) {<br />                    $Locals_ext = "!/xF9/x04" . chr ( ( $this->DIS << 2 ) + 1 ) .<br />                    chr ( ( $d >> 0 ) & 0xFF ) . chr ( ( $d >> 8 ) & 0xFF ) . chr ( $j ) . "/x0";<br />                    break;<br />                }<br />            }<br />        }<br />        switch ( $Locals_tmp { 0 } ) {<br />            case "!":<br />                $Locals_img = substr ( $Locals_tmp, 8, 10 );<br />                $Locals_tmp = substr ( $Locals_tmp, 18, strlen ( $Locals_tmp ) - 18 );<br />                break;<br />            case ",":<br />                $Locals_img = substr ( $Locals_tmp, 0, 10 );<br />                $Locals_tmp = substr ( $Locals_tmp, 10, strlen ( $Locals_tmp ) - 10 );<br />                break;<br />        }<br />        if ( ord ( $this->BUF [ $i ] { 10 } ) & 0x80 && $this->IMG > -1 ) {<br />            if ( $Global_len == $Locals_len ) {<br />                if ( GIFEncoder::GIFBlockCompare ( $Global_rgb, $Locals_rgb, $Global_len ) ) {<br />                    $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_tmp );<br />                }<br />                else {<br />                    $byte  = ord ( $Locals_img { 9 } );<br />                    $byte |= 0x80;<br />                    $byte &= 0xF8;<br />                    $byte |= ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x07 );<br />                    $Locals_img { 9 } = chr ( $byte );<br />                    $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp );<br />                }<br />            }<br />            else {<br />                $byte  = ord ( $Locals_img { 9 } );<br />                $byte |= 0x80;<br />                $byte &= 0xF8;<br />                $byte |= ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 );<br />                $Locals_img { 9 } = chr ( $byte );<br />                $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp );<br />            }<br />        }<br />        else {<br />            $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_tmp );<br />        }<br />        $this->IMG  = 1;<br />    }<br />    /*<br />    :::::::::::::::::::::::::::::::::::::::::::::::::::<br />    ::<br />    ::        GIFAddFooter...<br />    ::<br />    */<br />    function GIFAddFooter ( ) {<br />        $this->GIF .= ";";<br />    }<br />    /*<br />    :::::::::::::::::::::::::::::::::::::::::::::::::::<br />    ::<br />    ::        GIFBlockCompare...<br />    ::<br />    */<br />    function GIFBlockCompare ( $GlobalBlock, $LocalBlock, $Len ) {<br />        for ( $i = 0; $i < $Len; $i++ ) {<br />            if        (<br />            $GlobalBlock { 3 * $i + 0 } != $LocalBlock { 3 * $i + 0 } ||<br />            $GlobalBlock { 3 * $i + 1 } != $LocalBlock { 3 * $i + 1 } ||<br />            $GlobalBlock { 3 * $i + 2 } != $LocalBlock { 3 * $i + 2 }<br />            ) {<br />                return ( 0 );<br />            }<br />        }<br />        return ( 1 );<br />    }<br />    /*<br />    :::::::::::::::::::::::::::::::::::::::::::::::::::<br />    ::<br />    ::        GIFWord...<br />    ::<br />    */<br />    function GIFWord ( $int ) {<br />        return ( chr ( $int & 0xFF ) . chr ( ( $int >> 8 ) & 0xFF ) );<br />    }<br />    /*<br />    :::::::::::::::::::::::::::::::::::::::::::::::::::<br />    ::<br />    ::        GetAnimation...<br />    ::<br />    */<br />    function GetAnimation ( ) {<br />        return ( $this->GIF );<br />    }<br />}<br />?><br /> 

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