✏️ Editing: bmp.php

<?php

class bmp {

var $mpdf = null;

function bmp(&$mpdf) {
        $this->mpdf = $mpdf;
    }

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 array('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) >> 7128;
                            $bmpdata .= chr($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 array('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;
    }

function _fourbytes2int_le($s) {
        //Read a 4-byte integer from string
        return (ord($s[3]) << 24) + (ord($s[2]) << 16) + (ord($s[1]) << 8) + ord($s[0]);
    }

function _twobytes2int_le($s) {
        //Read a 2-byte integer from string
        return (ord(substr($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

# Decoder for RLE4 compression in windows bitmaps
# see http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/bitmaps_6x0u.asp

$out = '';
        if (count($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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