Файл: moduls/bmp.php
Строк: 112
<?php
function ConvertBMP2GD($src, $dest = false)
{
if (!($src_f = fopen($src, 'rb'))) {
return false;
}
if (!($dest_f = fopen($dest, 'wb'))) {
return false;
}
$header = unpack('vtype/Vsize/v2reserved/Voffset', fread($src_f, 14));
$info = unpack('Vsize/Vwidth/Vheight/vplanes/vbits/Vcompression/Vimagesize/Vxres/Vyres/Vncolor/Vimportant', fread($src_f, 40));
extract($info);
extract($header);
if ($type != 0x4D42) { // signature "BM"
return false;
}
$palette_size = $offset - 54;
$ncolor = $palette_size / 4;
// true-color vs. palette
$gd_header = ($palette_size == 0) ? "xFFxFE" : "xFFxFF";
$gd_header .= pack('n2', $width, $height);
$gd_header .= ($palette_size == 0) ? "x01" : "x00";
if ($palette_size) {
$gd_header .= pack('n', $ncolor);
}
// no transparency
$gd_header .= "xFFxFFxFFxFF";
fwrite($dest_f, $gd_header);
if ($palette_size) {
$palette = fread($src_f, $palette_size);
$gd_palette = '';
$j = 0;
while ($j < $palette_size) {
$b = $palette{$j++};
$g = $palette{$j++};
$r = $palette{$j++};
$a = $palette{$j++};
$gd_palette .= "$r$g$b$a";
}
$gd_palette .= str_repeat("x00x00x00x00", 256 - $ncolor);
fwrite($dest_f, $gd_palette);
}
$scan_line_size = (($bits * $width) + 7) >> 3;
$scan_line_align = ($scan_line_size & 0x03) ? 4 - ($scan_line_size & 0x03) : 0;
for ($i = 0, $l = $height - 1; $i < $height; $i++, $l--) {
// BMP stores scan lines starting from bottom
fseek($src_f, $offset + (($scan_line_size + $scan_line_align) * $l));
$scan_line = fread($src_f, $scan_line_size);
if ($bits == 24) {
$gd_scan_line = '';
$j = 0;
while ($j < $scan_line_size) {
$b = $scan_line{$j++};
$g = $scan_line{$j++};
$r = $scan_line{$j++};
$gd_scan_line .= "x00$r$g$b";
}
} else
if ($bits == 8) {
$gd_scan_line = $scan_line;
} else
if ($bits == 4) {
$gd_scan_line = '';
$j = 0;
while ($j < $scan_line_size) {
$byte = ord($scan_line{$j++});
$p1 = chr($byte >> 4);
$p2 = chr($byte & 0x0F);
$gd_scan_line .= "$p1$p2";
}
$gd_scan_line = substr($gd_scan_line, 0, $width);
} else
if ($bits == 1) {
$gd_scan_line = "";
$j = 0;
while ($j < $scan_line_size) {
$byte = ord($scan_line{$j++});
$p1 = chr((int)(($byte & 0x80) != 0));
$p2 = chr((int)(($byte & 0x40) != 0));
$p3 = chr((int)(($byte & 0x20) != 0));
$p4 = chr((int)(($byte & 0x10) != 0));
$p5 = chr((int)(($byte & 0x08) != 0));
$p6 = chr((int)(($byte & 0x04) != 0));
$p7 = chr((int)(($byte & 0x02) != 0));
$p8 = chr((int)(($byte & 0x01) != 0));
$gd_scan_line .= "$p1$p2$p3$p4$p5$p6$p7$p8";
}
$gd_scan_line = substr($gd_scan_line, 0, $width);
}
fwrite($dest_f, $gd_scan_line);
}
fclose($src_f);
fclose($dest_f);
return true;
}
function imagecreatefrombmp($filename, $tmp = '/tmp')
{
$tmp_name = tempnam($tmp, 'GD');
if (ConvertBMP2GD($filename, $tmp_name)) {
$img = imagecreatefromgd($tmp_name);
unlink($tmp_name);
return $img;
}
return false;
}
?>