Viewing file:  Bmp.php (7.4 KB) -rw-r--r--
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<?php
namespace Mpdf\Image;
use Mpdf\Mpdf;
class Bmp
{
/**
* @var Mpdf
*/
private $mpdf;
public function __construct(Mpdf $mpdf)
{
$this->mpdf = $mpdf;
}
public function _getBMPimage($data, $file)
{
// Adapted from script by Valentin Schmidt
// http://staff.dasdeck.de/valentin/fpdf/fpdf_bmp/
$bfOffBits = $this->_fourbytes2int_le(substr($data, 10, 4));
$width = $this->_fourbytes2int_le(substr($data, 18, 4));
$height = $this->_fourbytes2int_le(substr($data, 22, 4));
$flip = ($height < 0);
if ($flip) {
$height = -$height;
}
$biBitCount = $this->_twobytes2int_le(substr($data, 28, 2));
$biCompression = $this->_fourbytes2int_le(substr($data, 30, 4));
$info = ['w' => $width, 'h' => $height];
if ($biBitCount < 16) {
$info['cs'] = 'Indexed';
$info['bpc'] = $biBitCount;
$palStr = substr($data, 54, $bfOffBits - 54);
$pal = '';
$cnt = strlen($palStr) / 4;
for ($i = 0; $i < $cnt; $i++) {
$n = 4 * $i;
$pal .= $palStr[$n + 2] . $palStr[$n + 1] . $palStr[$n];
}
$info['pal'] = $pal;
} else {
$info['cs'] = 'DeviceRGB';
$info['bpc'] = 8;
}
if ($this->mpdf->restrictColorSpace == 1 || $this->mpdf->PDFX || $this->mpdf->restrictColorSpace == 3) {
if (($this->mpdf->PDFA && !$this->mpdf->PDFAauto) || ($this->mpdf->PDFX && !$this->mpdf->PDFXauto)) {
$this->mpdf->PDFAXwarnings[] = "Image cannot be converted to suitable colour space for PDFA or PDFX file - $file - (Image replaced by 'no-image'.)";
}
return ['error' => "BMP Image cannot be converted to suitable colour space - $file - (Image replaced by 'no-image'.)"];
}
$biXPelsPerMeter = $this->_fourbytes2int_le(substr($data, 38, 4)); // horizontal pixels per meter, usually set to zero
//$biYPelsPerMeter=$this->_fourbytes2int_le(substr($data,42,4)); // vertical pixels per meter, usually set to zero
$biXPelsPerMeter = round($biXPelsPerMeter / 1000 * 25.4);
//$biYPelsPerMeter=round($biYPelsPerMeter/1000 *25.4);
$info['set-dpi'] = $biXPelsPerMeter;
switch ($biCompression) {
case 0:
$str = substr($data, $bfOffBits);
break;
case 1: # BI_RLE8
$str = $this->rle8_decode(substr($data, $bfOffBits), $width);
break;
case 2: # BI_RLE4
$str = $this->rle4_decode(substr($data, $bfOffBits), $width);
break;
}
$bmpdata = '';
$padCnt = (4 - ceil($width / (8 / $biBitCount)) % 4) % 4;
switch ($biBitCount) {
case 1:
case 4:
case 8:
$w = floor($width / (8 / $biBitCount)) + ($width % (8 / $biBitCount) ? 1 : 0);
$w_row = $w + $padCnt;
if ($flip) {
for ($y = 0; $y < $height; $y++) {
$y0 = $y * $w_row;
for ($x = 0; $x < $w; $x++) {
$bmpdata .= $str[$y0 + $x];
}
}
} else {
for ($y = $height - 1; $y >= 0; $y--) {
$y0 = $y * $w_row;
for ($x = 0; $x < $w; $x++) {
$bmpdata .= $str[$y0 + $x];
}
}
}
break;
case 16:
$w_row = $width * 2 + $padCnt;
if ($flip) {
for ($y = 0; $y < $height; $y++) {
$y0 = $y * $w_row;
for ($x = 0; $x < $width; $x++) {
$n = (ord($str[$y0 + 2 * $x + 1]) * 256 + ord($str[$y0 + 2 * $x]));
$b = ($n & 31) << 3;
$g = ($n & 992) >> 2;
$r = ($n & 31744) >> 7;
$bmpdata .= chr($r) . chr($g) . chr($b);
}
}
} else {
for ($y = $height - 1; $y >= 0; $y--) {
$y0 = $y * $w_row;
for ($x = 0; $x < $width; $x++) {
$n = (ord($str[$y0 + 2 * $x + 1]) * 256 + ord($str[$y0 + 2 * $x]));
$b = ($n & 31) << 3;
$g = ($n & 992) >> 2;
$r = ($n & 31744) >> 7;
$bmpdata .= chr($r) . chr($g) . chr($b);
}
}
}
break;
case 24:
case 32:
$byteCnt = $biBitCount / 8;
$w_row = $width * $byteCnt + $padCnt;
if ($flip) {
for ($y = 0; $y < $height; $y++) {
$y0 = $y * $w_row;
for ($x = 0; $x < $width; $x++) {
$i = $y0 + $x * $byteCnt; # + 1
$bmpdata .= $str[$i + 2] . $str[$i + 1] . $str[$i];
}
}
} else {
for ($y = $height - 1; $y >= 0; $y--) {
$y0 = $y * $w_row;
for ($x = 0; $x < $width; $x++) {
$i = $y0 + $x * $byteCnt; # + 1
$bmpdata .= $str[$i + 2] . $str[$i + 1] . $str[$i];
}
}
}
break;
default:
return ['error' => 'Error parsing BMP image - Unsupported image biBitCount'];
}
if ($this->mpdf->compress) {
$bmpdata = gzcompress($bmpdata);
$info['f'] = 'FlateDecode';
}
$info['data'] = $bmpdata;
$info['type'] = 'bmp';
return $info;
}
/**
* Read a 4-byte integer from string
*
* @param $s
* @return int
*/
private function _fourbytes2int_le($s)
{
return (ord($s[3]) << 24) + (ord($s[2]) << 16) + (ord($s[1]) << 8) + ord($s[0]);
}
/**
* Read a 2-byte integer from string
*
* @param $s
* @return int
*/
private function _twobytes2int_le($s)
{
return (ord(substr($s, 1, 1)) << 8) + ord(substr($s, 0, 1));
}
/**
* Decoder for RLE8 compression in windows bitmaps
*
* @see http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/bitmaps_6x0u.asp
* @param $str
* @param $width
* @return string
*/
private function rle8_decode($str, $width)
{
$lineWidth = $width + (3 - ($width - 1) % 4);
$out = '';
$cnt = strlen($str);
for ($i = 0; $i < $cnt; $i++) {
$o = ord($str[$i]);
if ($o === 0) { # ESCAPE
$i++;
switch (ord($str[$i])) {
case 0: # NEW LINE
$padCnt = $lineWidth - strlen($out) % $lineWidth;
if ($padCnt < $lineWidth) {
$out .= str_repeat(chr(0), $padCnt);# pad line
}
break;
case 1: # END OF FILE
$padCnt = $lineWidth - strlen($out) % $lineWidth;
if ($padCnt < $lineWidth) {
$out .= str_repeat(chr(0), $padCnt);# pad line
}
break 2;
case 2: # DELTA
$i += 2;
break;
default: # ABSOLUTE MODE
$num = ord($str[$i]);
for ($j = 0; $j < $num; $j++) {
$out .= $str[++$i];
}
if ($num % 2) {
$i++;
}
}
} else {
$out .= str_repeat($str[++$i], $o);
}
}
return $out;
}
/**
* Decoder for RLE4 compression in windows bitmaps
*
* @see http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/bitmaps_6x0u.asp
* @param $str
* @param $width
* @return string
*/
private function rle4_decode($str, $width)
{
$w = floor($width / 2) + ($width % 2);
$lineWidth = $w + (3 - ( ($width - 1) / 2) % 4);
$pixels = [];
$cnt = strlen($str);
for ($i = 0; $i < $cnt; $i++) {
$o = ord($str[$i]);
if ($o === 0) { # ESCAPE
$i++;
switch (ord($str[$i])) {
case 0: # NEW LINE
while (count($pixels) % $lineWidth !== 0) {
$pixels[] = 0;
}
break;
case 1: # END OF FILE
while (count($pixels) % $lineWidth !== 0) {
$pixels[] = 0;
}
break 2;
case 2: # DELTA
$i += 2;
break;
default: # ABSOLUTE MODE
$num = ord($str[$i]);
for ($j = 0; $j < $num; $j++) {
if ($j % 2 === 0) {
$c = ord($str[++$i]);
$pixels[] = ($c & 240) >> 4;
} else {
$pixels[] = $c & 15; //FIXME: undefined var
}
}
if ($num % 2) {
$i++;
}
}
} else {
$c = ord($str[++$i]);
for ($j = 0; $j < $o; $j++) {
$pixels[] = ($j % 2 === 0 ? ($c & 240) >> 4 : $c & 15);
}
}
}
$out = '';
if (count($pixels) % 2) {
$pixels[] = 0;
}
$cnt = count($pixels) / 2;
for ($i = 0; $i < $cnt; $i++) {
$out .= chr(16 * $pixels[2 * $i] + $pixels[2 * $i + 1]);
}
return $out;
}
}
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