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标题: PHP之生成GIF动画的实现方法 [打印本页]

作者: 新格网络 时间: 2018-2-14 08:21

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


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