PHP之生成GIF动画的实现方法_php技巧

代码如下所示：

<?<BR>class GifMerge { <BR>    var $ver            = '1.1'; <BR>    var $dly            = 50; <BR>    var $mod            = 'C_FILE'; <BR>    var $first            = true; <BR>    var $use_loop            = false; <BR>    var $transparent        = false; <BR>    var $use_global_in        = false; <BR>    var $x                = 0; <BR>    var $y                = 0; <BR>    var $ch                = 0; <BR>    var $fin            = 0; <BR>    var $fout            = ''; <BR>    var $loop            = 0; <BR>    var $delay            = 0; <BR>    var $width            = 0; <BR>    var $height            = 0; <BR>    var $trans1             = 255; <BR>    var $trans2             = 255; <BR>    var $trans3             = 255; <BR>    var $disposal            = 2; <BR>    var $out_color_table_size    = 0; <BR>    var $local_color_table_flag    = 0; <BR>    var $global_color_table_size    = 0; <BR>    var $out_color_table_sizecode    = 0; <BR>    var $global_color_table_sizecode= 0; <BR>    var $gif            = array(0x47, 0x49, 0x46); <BR>    var $buffer            = array(); <BR>    var $local_in            = array(); <BR>    var $global_in            = array(); <BR>    var $global_out            = array(); <BR>    var $logical_screen_descriptor    = array(); <BR>    function GifMerge($images, $t1, $t2, $t3, $loop, $dl, $xpos, $ypos, $model) { <BR>        if($model) { <BR>            $this->mod = $model; <BR>        } <BR>        if($loop > -1) { <BR>            $this->loop = floor($loop - 1); <BR>            $this->use_loop = true; <BR>        } <BR>        if($t1 > -1 && $t2 > -1 && $t3 > -1) { <BR>            $this->trans1 = $t1; <BR>            $this->trans2 = $t2; <BR>            $this->trans3 = $t3; <BR>            $this->transparent = true; <BR>        } <BR>        for($i = 0; $i < count($images); $i++) { <BR>            $dl[$i]    ? $this->delay = $dl[$i] : $this->delay = $this->dly; <BR>            $xpos[$i] ? $this->x = $xpos[$i] : $this->x = 0; <BR>            $ypos[$i] ? $this->y = $ypos[$i] : $this->y = 0; <BR>            $this->start_gifmerge_process($images[$i]); <BR>        } <BR>        $this->fout .= "/x3b"; <BR>    } <BR>    function start_gifmerge_process($fp) { <BR>        if($this->mod == 'C_FILE') { <BR>            if(!$this->fin = fopen($fp, 'rb')) { <BR>                return; <BR>            } <BR>        } elseif($this->mod == 'C_MEMORY') { <BR>            $this->ch = 0; <BR>            $this->fin = $fp; <BR>        } <BR>        $this->getbytes(6); <BR>        if(!$this->arrcmp($this->buffer, $this->gif, 3)) { <BR>            return; <BR>        } <BR>        $this->getbytes(7); <BR>        if($this->first) $this->logical_screen_descriptor = $this->buffer; <BR>        $this->global_color_table_sizecode = $this->buffer[4] & 0x07; <BR>        $this->global_color_table_size = 2 <global_color_table_sizecode; <BR>        if($this->buffer[4] & 0x80) { <BR>            $this->getbytes((3 * $this->global_color_table_size)); <BR>            for($i = 0; $i global_color_table_size)); $i++) { <BR>                $this->global_in[$i] = $this->buffer[$i]; <BR>            } <BR>            if($this->out_color_table_size == 0) { <BR>                $this->out_color_table_size = $this->global_color_table_size; <BR>                $out_color_table_sizecode = $this->global_color_table_sizecode; <BR>                $this->global_out = $this->global_in; <BR>            } <BR>            if($this->global_color_table_size != $this->out_color_table_size || $this->arrcmp($this->global_out, $this->global_in, (3 * $this->global_color_table_size))) { <BR>                $this->use_global_in = true; <BR>            } <BR>        } <BR>        for($loop = true; $loop;) { <BR>            $this->getbytes(1); <BR>            switch($this->buffer[0]) { <BR>                case 0x21: <BR>                    $this->read_extension(); <BR>                    break; <BR>                case 0x2c: <BR>                    $this->read_image_descriptor(); <BR>                    break; <BR>                case 0x3b: <BR>                    $loop = false; <BR>                break; <BR>                default: <BR>                    $loop = false; <BR>            } <BR>        } <BR>        if($this->mod == 'C_FILE') { <BR>            fclose($this->fin); <BR>        } <BR>    } <BR>    function read_image_descriptor() { <BR>        $this->getbytes(9); <BR>        $head = $this->buffer; <BR>            $this->local_color_table_flag = ($this->buffer[8] & 0x80) ? true : false; <BR>            if($this->local_color_table_flag) { <BR>            $sizecode = $this->buffer[8] & 0x07; <BR>            $size = 2 << $sizecode; <BR>            $this->getbytes(3 * $size); <BR>            for($i = 0; $i < (3 * $size); $i++) { <BR>                    $this->local_in[$i] = $this->buffer[$i]; <BR>                } <BR>                if($this->out_color_table_size == 0) { <BR>                    $this->out_color_table_size = $size; <BR>                    $out_color_table_sizecode = $sizecode; <BR>              <div style="color:transparent">！本文来源gaodai.ma#com搞##代!^码网(</div><sup>搞gaodaima代码</sup>  for($i = 0; $i < (3 * $size); $i++) <BR>                { <BR>                    $this->global_out[$i] = $this->local_in[$i]; <BR>                } <BR>                } <BR>            } <BR>            if($this->first) { <BR>            $this->first = false; <BR>            $this->fout .= "/x47/x49/x46/x38/x39/x61"; <BR>            if($this->width && $this->height) { <BR>                $this->logical_screen_descriptor[0] = $this->width & 0xFF; <BR>                $this->logical_screen_descriptor[1] = ($this->width & 0xFF00) >> 8; <BR>                $this->logical_screen_descriptor[2] = $this->height & 0xFF; <BR>                $this->logical_screen_descriptor[3] = ($this->height & 0xFF00) >> 8; <BR>            } <BR>            $this->logical_screen_descriptor[4] |= 0x80; <BR>            $this->logical_screen_descriptor[5] &= 0xF0; <BR>            $this->logical_screen_descriptor[6] |= $this->out_color_table_sizecode; <BR>            $this->putbytes($this->logical_screen_descriptor, 7); <BR>                $this->putbytes($this->global_out, ($this->out_color_table_size * 3)); <BR>            if($this->use_loop) { <BR>                $ns[0] = 0x21; <BR>                $ns[1] = 0xFF; <BR>                $ns[2] = 0x0B; <BR>                $ns[3] = 0x4e; <BR>                $ns[4] = 0x45; <BR>                $ns[5] = 0x54; <BR>                $ns[6] = 0x53; <BR>                $ns[7] = 0x43; <BR>                $ns[8] = 0x41; <BR>                $ns[9] = 0x50; <BR>                $ns[10] = 0x45; <BR>                $ns[11] = 0x32; <BR>                $ns[12] = 0x2e; <BR>                $ns[13] = 0x30; <BR>                $ns[14] = 0x03; <BR>                $ns[15] = 0x01; <BR>                $ns[16] = $this->loop & 255; <BR>                    $ns[17] = $this->loop >> 8; <BR>                $ns[18] = 0x00; <BR>                $this->putbytes($ns, 19); <BR>            } <BR>            } <BR>          if($this->use_global_in) { <BR>            $outtable = $this->global_in; <BR>            $outsize = $this->global_color_table_size; <BR>            $outsizecode = $this->global_color_table_sizecode; <BR>        } else { <BR>            $outtable = $this->global_out; <BR>            $outsize = $this->out_color_table_size; <BR>        } <BR>        if($this->local_color_table_flag) { <BR>            if($size == $this->out_color_table_size && !$this->arrcmp($this->local_in, $this->global_out, $size)) { <BR>                $outtable = $global_out; <BR>                $outsize = $this->out_color_table_size; <BR>            } else { <BR>                $outtable = $this->local_in; <BR>                $outsize = $size; <BR>                $outsizecode = $sizecode; <BR>            } <BR>        } <BR>        $use_trans = false; <BR>        if($this->transparent) { <BR>            for($i = 0; $i < $outsize; $i++) { <BR>                if($outtable[3 * $i] == $this->trans1 && $outtable [3 * $i + 1] == $this->trans2 && $outtable [3 * $i + 2] == $this->trans3) { <BR>                    break; <BR>                } <BR>            } <BR>            if($i < $outsize) { <BR>                $transindex = $i; <BR>                $use_trans = true; <BR>            } <BR>        } <BR>        if($this->delay || $use_trans) { <BR>            $this->buffer[0] = 0x21; <BR>            $this->buffer[1] = 0xf9; <BR>            $this->buffer[2] = 0x04; <BR>            $this->buffer[3] = ($this->disposal << 2) + ($use_trans ? 1 : 0); <BR>            $this->buffer[4] = $this->delay & 0xff; <BR>            $this->buffer[5] = ($this->delay & 0xff00) >> 8; <BR>            $this->buffer[6] = $use_trans ? $transindex : 0; <BR>            $this->buffer[7] = 0x00; <BR>            $this->putbytes($this->buffer,8); <BR>        } <BR>        $this->buffer[0] = 0x2c; <BR>        $this->putbytes($this->buffer,1); <BR>        $head[0] = $this->x & 0xff; <BR>        $head[1] = ($this->x & 0xff00) >> 8; <BR>        $head[2] = $this->y & 0xff; <BR>        $head[3] = ($this->y & 0xff00) >> 8; <BR>        $head[8] &= 0x40; <BR>        if($outtable != $this->global_out) { <BR>            $head[8] |= 0x80; <BR>            $head[8] |= $outsizecode; <BR>        } <BR>        $this->putbytes($head,9); <BR>        if($outtable != $this->global_out) { <BR>            $this->putbytes($outtable, (3 * $outsize)); <BR>        } <BR>        $this->getbytes(1); <BR>        $this->putbytes($this->buffer,1); <BR>        for(;;) { <BR>            $this->getbytes(1); <BR>            $this->putbytes($this->buffer,1); <BR>            if(($u = $this->buffer[0]) == 0) { <BR>                break; <BR>            } <BR>            $this->getbytes($u); <BR>            $this->putbytes($this->buffer, $u); <BR>            } <BR>    } <BR>    function read_extension() { <BR>        $this->getbytes(1); <BR>        switch($this->buffer[0]) { <BR>            case 0xf9: <BR>                    $this->getbytes(6); <BR>                   break; <BR>            case 0xfe: <BR>                    for(;;) { <BR>                    $this->getbytes(1); <BR>                            if(($u = $this->buffer[0]) == 0) { <BR>                            break; <BR>                        } <BR>                    $this->getbytes($u); <BR>                    } <BR>                break; <BR>            case 0x01: <BR>                    $this->getbytes(13); <BR>                    for(;;) { <BR>                    $this->getbytes(0); <BR>                            if(($u = $this->buffer[0]) == 0) { <BR>                            break; <BR>                        } <BR>                    $this->getbytes($u); <BR>                    } <BR>                break; <BR>                   case 0xff: <BR>                    $this->getbytes(9); <BR>                    $this->getbytes(3); <BR>                    for(;;) { <BR>                    $this->getbytes(1); <BR>                            if(!$this->buffer[0]) { <BR>                                break; <BR>                            } <BR>                            $this->getbytes($this->buffer[0]); <BR>                        } <BR>                break; <BR>            default: <BR>                    for(;;) { <BR>                    $this->getbytes(1); <BR>                        if(!$this->buffer[0]) { <BR>                            break; <BR>                        } <BR>                    $this->getbytes($this->buffer[0]); <BR>                } <BR>            } <BR>    } <BR>    function arrcmp($b, $s, $l) { <BR>        for($i = 0; $i < $l; $i++) { <BR>            if($s{$i} != $b{$i}) { <BR>                return false; <BR>            } <BR>        } <BR>        return true; <BR>    } <BR>    function getbytes($l) { <BR>        for($i = 0; $i < $l; $i++) { <BR>            if($this->mod == 'C_FILE') { <BR>                    $bin = unpack('C*', fread($this->fin, 1)); <BR>                    $this->buffer[$i] = $bin[1]; <BR>                } elseif($this->mod == 'C_MEMORY') { <BR>                        $bin = unpack('C*', substr($this->fin, $this->ch, 1)); <BR>                        $this->buffer[$i] = $bin[1]; <BR>                        $this->ch++; <BR>                } <BR>        } <BR>        return $this->buffer; <BR>    } <BR>    function putbytes($s, $l) { <BR>        for($i = 0; $i < $l; $i++) { <BR>            $this->fout .= pack('C*', $s[$i]); <BR>        } <BR>    } <BR>    function getAnimation() { <BR>        return $this->fout; <BR>    } <BR>} <BR>?><BR>

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