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标题: 不用GD库生成当前时间的PNG格式图象的程序 [打印本页]

作者: bewin83 时间: 2018-2-14 09:46

         该程序是不用GD库可以生成当前时间的PNG格式图象，给人大开眼界，很有参考价值. teaman整理
$ofs = 3 * ($sx * $y + $x);
$pixels[$ofs] = chr($r);
$pixels[$ofs + 1] = chr($g);
$pixels[$ofs + 2] = chr($b);
$pixels[$ofs + 3] = chr($r);
$pixels[$ofs + 4] = chr($g);
$pixels[$ofs + 5] = chr($b);
$ofs += 3 * $sx;
$pixels[$ofs] = chr($r);
$pixels[$ofs + 1] = chr($g);
$pixels[$ofs + 2] = chr($b);
$pixels[$ofs + 3] = chr($r);
$pixels[$ofs + 4] = chr($g);
$pixels[$ofs + 5] = chr($b);
}
//生成数字图象的函数
function draw2digits($x, $y, $number)
{
draw_digit($x, $y, (int) ($number / 10));
draw_digit($x + 11, $y, $number % 10);
}
function draw_digit($x, $y, $digit)
{
global $sx, $sy, $pixels, $digits, $lines;
$digit = $digits[$digit];
$m = 8;
for ($b = 1, $i = 0; $i
// chunk :为层
// length: 4 字节: 用来计算 chunk
// chunk type: 4 字节
// chunk data: length bytes
// CRC: 4 字节:  循环冗余码校验
// copy data and create CRC checksum
$len = strlen($data);
$chunk = pack("c*", ($len >> 24) & 255,
      ($len >> 16) & 255,
      ($len >> 8) & 255,
      $len & 255);
$chunk .= $type;
$chunk .= $data;
// calculate a CRC checksum with the bytes chunk[4..len-1]
$z = 16777215;
$z |= 255 > 8) & 0xffffff;
      $c = $crc_table[($c ^ ord($chunk][$n])) & 0xff] ^ $c8;
}
$crc = $c ^ $z;
$chunk .= chr(($crc >> 24) & 255);
$chunk .= chr(($crc >> 16) & 255);
$chunk .= chr(($crc >> 8) & 255);
$chunk .= chr($crc & 255);
// 将结果加到$result中
$result .= $chunk;
}
//主程序
$sx = 80;
$sy = 21;
$pixels = "";
// 填充
for ($h = 0; $h
// 创建循环冗余码校验表
$z = -306674912;  // = 0xedb88320
for ($n = 0; $n > 1) & 0x7fffffff;
         if ($c & 1) $c = $z ^ ($c2); else $c = $c2;
      }
      $crc_table[$n] = $c;
}
// PNG file signature
$result = pack("c*", 137,80,78,71,13,10,26,10);
// IHDR chunk data:
// width:             4 bytes
// height:          4 bytes
// bit depth:       1 byte (8 bits per RGB value)
// color type:       1 byte (2 = RGB)
// compression method: 1 byte (0 = deflate/inflate)
// filter method:    1 byte (0 = adaptive filtering)
// interlace method: 1 byte (0 = no interlace)
$data = pack("c*", ($sx >> 24) & 255,
($sx >> 16) & 255,
($sx >> 8) & 255,
$sx & 255,
($sy >> 24) & 255,
($sy >> 16) & 255,
($sy >> 8) & 255,
$sy & 255,
8,
2,
0,
0,
0);
add_chunk("IHDR");
// 以下不敢乱翻译，请自行参考
// scanline:
//       filter byte: 0 = none
//       RGB bytes for the line
// the scanline is compressed with "zlib", method 8 (RFC-1950):
//       compression method/flags code: 1 byte ($78 = method 8, 32k window)
//       additional flags/check bits: 1 byte ($01: FCHECK = 1, FDICT = 0, FLEVEL = 0)
//       compressed data blocks:       n bytes
//          one block (RFC-1951):
//             bit 0: BFINAL: 1 for the last block
//             bit 1 and 2: BTYPE: 0 for no compression
//             next 2 bytes: LEN (LSB first)
//             next 2 bytes: one's complement of LEN
//             LEN bytes uncompressed data
//       check value:  4 bytes (Adler-32 checksum of the uncompressed data)
//
$len = ($sx * 3 + 1) * $sy;
$data = pack("c*", 0x78, 0x01,
      1,
$len & 255,
($len >> 8) & 255,
255 - ($len & 255),
255 - (($len >> 8) & 255));
$start = strlen($data);
$i2 = 0;
for ($h = 0; $h
// calculate a Adler32 checksum with the bytes data[start..len-1]
$s1 = 1;
$s2 = 0;
for ($n = $start; $n
$data .= chr(($adler >> 24) & 255);
$data .= chr(($adler >> 16) & 255);
$data .= chr(($adler >> 8) & 255);
$data .= chr($adler & 255);
add_chunk("IDAT");
// IEND: marks the end of the PNG-file
$data = "";
add_chunk("IEND");
// 列印图象
echo($result);
?>
//如何调用，其实很简单，将上面存为Time
//然后新建一个页面如下：


test



  //以图象连接方式调用PHP文件





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