imagecreatefrombmp.function.php

<?php
// Read 24bit BMP files

// Author: de77
// Licence: MIT
// Webpage: de77.com
// Version: 07.02.2010

function imagecreatefrombmp($filename) {
	$f = fopen($filename, "rb");
	
    //read header    
    $header = fread($f, 54);
    $header = unpack('c2identifier/Vfile_size/Vreserved/Vbitmap_data/Vheader_size/'.
    'Vwidth/Vheight/vplanes/vbits_per_pixel/Vcompression/Vdata_size/'.
    'Vh_resolution/Vv_resolution/Vcolors/Vimportant_colors', $header);

	if ($header['identifier1'] != 66 or $header['identifier2'] != 77)
		return false;
		
	if ($header['bits_per_pixel'] != 24)
		return false;
	
	$wid2 = ceil((3 * $header['width']) / 4) * 4;
	
	$wid = $header['width'];
	$hei = $header['height'];

	$img = imagecreatetruecolor($header['width'], $header['height']);
	
	//read pixels
	for ($y = $hei - 1; $y >= 0; $y--) {
		$row = fread($f, $wid2);
		$pixels = str_split($row, 3);
		
		for ($x = 0; $x < $wid; $x++) {
			imagesetpixel($img, $x, $y, dwordize($pixels[$x]));
		}
	}
	fclose($f);
	return $img;
}

function dwordize($str) {
	$a = ord($str[0]);
	$b = ord($str[1]);
	$c = ord($str[2]);
	return $c * 256 * 256 + $b * 256 + $a;
}