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imagebmp.function.php
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imagebmp.function.php
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<?php
// Save 24bit BMP files
// Author: de77
// Licence: MIT
// Webpage: de77.com
// Version: 07.02.2010
function imagebmp(&$img, $filename = false) {
$wid = imagesx($img);
$hei = imagesy($img);
$wid_pad = str_pad('', $wid % 4, "\0");
$size = 54 + ($wid + $wid_pad) * $hei;
//prepare & save header
$header['identifier'] = 'BM';
$header['file_size'] = dword($size);
$header['reserved'] = dword(0);
$header['bitmap_data'] = dword(54);
$header['header_size'] = dword(40);
$header['width'] = dword($wid);
$header['height'] = dword($hei);
$header['planes'] = word(1);
$header['bits_per_pixel']= word(24);
$header['compression']= dword(0);
$header['data_size'] = dword(0);
$header['h_resolution'] = dword(0);
$header['v_resolution'] = dword(0);
$header['colors'] = dword(0);
$header['important_colors'] = dword(0);
if ($filename) {
$f = fopen($filename, "wb");
foreach ($header AS $h) {
fwrite($f, $h);
}
//save pixels
for ($y=$hei-1; $y>=0; $y--) {
for ($x=0; $x<$wid; $x++) {
$rgb = imagecolorat($img, $x, $y);
fwrite($f, byte3($rgb));
}
fwrite($f, $wid_pad);
}
return fclose($f);
}
else {
foreach ($header AS $h) {
echo $h;
}
//save pixels
for ($y = $hei - 1; $y >= 0; $y--) {
for ($x=0; $x<$wid; $x++) {
$rgb = imagecolorat($img, $x, $y);
echo byte3($rgb);
}
echo $wid_pad;
}
return true;
}
}
function byte3($n) {
return chr($n & 255) . chr(($n >> 8) & 255) . chr(($n >> 16) & 255);
}
function dword($n) {
return pack("V", $n);
}
function word($n) {
return pack("v", $n);
}