23. juni 2004 - 09:27
Der er
5 kommentarer og 1 løsning
Konvertering af bmp til jpg med php
Hej Jeg mangler en funktion til php der kan konvertere bmp filer til jpg. Jeg kan se at der i GDlib2 findes kommandoer der kan konvertere fra jpg til bmp. Men kan det lade sig gøre den anden vej??? Jesper
Annonceindlæg fra Computerworld it-jobbank
Jeg fandt dette script på eksperten.... :) Der er ikke bmp support i GD. <?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; $gd_header = ""; // true-color vs. palette $gd_header .= ($palette_size == 0) ? "\xFF\xFE" : "\xFF\xFF"; $gd_header .= pack("n2", $width, $height); $gd_header .= ($palette_size == 0) ? "\x01" : "\x00"; if($palette_size) { $gd_header .= pack("n", $ncolor); } // no transparency $gd_header .= "\xFF\xFF\xFF\xFF"; fwrite($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("\x00\x00\x00\x00", 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) { $tmp_name = tempnam("/tmp", "GD"); if(ConvertBMP2GD($filename, $tmp_name)) { $img = imagecreatefromgd($tmp_name); unlink($tmp_name); return $img; } return false; } $img = imagecreatefrombmp("test24bit.bmp"); imagejpeg($img, "test.jpg"); ?> VIRKER!!!!!!!!!