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Added device-independent bitmap support #99

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Added device-independent bitmap support #99

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23 changes: 22 additions & 1 deletion src/Html/HtmlFormatter.php
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Original file line number Diff line number Diff line change
Expand Up @@ -174,6 +174,7 @@ protected function ExtractImage($pictGrp)
case "jpegblip": $Image->format = 'jpeg'; break;
case "macpict": $Image->format = 'pict'; break;
// case "wmetafile": $Image->format = 'bmp'; break;
case "dibitmap": $Image->format = 'dibitmap'; break;

// Picture size and scaling
case "picw": $Image->width = $child->parameter; break;
Expand All @@ -189,7 +190,27 @@ protected function ExtractImage($pictGrp)
}

} elseif ($child instanceof \RtfHtmlPhp\Text) { // store Data
$Image->ImageData = $child->text;
if ($Image->format == 'dibitmap') { // convert DIB to bitmap
// Header field, 2 bytes
$fileHeader = "424D"; // 'BM'
// File size, 4 bytes
$fileSize = strlen($child->text)/2 + 14;
$fileHeader .= sprintf("%02X", $fileSize & 0xFF);
$fileHeader .= sprintf("%02X", ($fileSize & 0xFF00) >> 8);
$fileHeader .= sprintf("%02X", ($fileSize & 0xFF0000) >> 16);
$fileHeader .= sprintf("%02X", ($fileSize & 0xFF000000) >> 24);
// Reserved 4 bytes
$fileHeader .= "00000000";
// Offset, 4 bytes, but only one byte is used (max=124+14)
$dibHeaderSize = ord(hex2bin(substr($child->text, 0, 2)));
$fileHeader .= sprintf("%02X", $dibHeaderSize + 14) . "000000";
// Create bitmap file and set correct format
$Image->ImageData = $fileHeader . $child->text;
$Image->format = 'bmp';
}
else {
$Image->ImageData = $child->text;
}
}
}
// output Image
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