int PDFWriter::saveJpegImage(const QString &jpegFileName, const QSize &sizePixels, Types::ColorTypes colorType)
{
int err = 0;
err = addImageResourcesAndXObject();
QFile jpegFile(jpegFileName);
if (!jpegFile.open(QIODevice::ReadOnly))
return 2;
const int jpegFileSize = jpegFile.size();
if (jpegFileSize == 0)
return 3;
const QString colorSpace =
colorType == Types::ColorTypeCMYK ? QLatin1String("/DeviceCMYK")
: colorType == Types::ColorTypeRGB ? QLatin1String("/DeviceRGB")
: QLatin1String("/DeviceGray");
// Yes. Cmyk jpegs in PDFs need reverse decoding, somehow
const QString decodeArray =
colorType == Types::ColorTypeCMYK ? QLatin1String("/Decode [1.0 0.0 1.0 0.0 1.0 0.0 1.0 0.0]" LINEFEED)
: QString();
addOffsetToXref();
m_outStream << QString::fromLatin1(
LINEFEED "%1 0 obj" LINEFEED
"<</ColorSpace %2" LINEFEED
"/Subtype /Image" LINEFEED
"/Length %3" LINEFEED
"/Width %4" LINEFEED
"/Type /XObject" LINEFEED
"/Height %5" LINEFEED
"/BitsPerComponent 8" LINEFEED
"/Filter /DCTDecode" LINEFEED
"%6"
">>" LINEFEED
"stream" LINEFEED)
.arg(m_pdfObjectCount)
.arg(colorSpace)
.arg(jpegFileSize)
.arg(sizePixels.width())
.arg(sizePixels.height())
.arg(decodeArray);
m_outStream.flush();
while (!jpegFile.atEnd())
m_outStream.device()->write(jpegFile.read(200000));
m_outStream <<
LINEFEED "endstream" LINEFEED
"endobj";
return err;
}
void JPEGFileWriter::handleJPEG(const char *theJPEG, size_t theSize)
{
++myCount;
std::ostringstream fileName;
fileName << myDirectory << "/" << myFileBase << std::setw(9)
<< std::setfill('0') << myCount << ".jpg";
std::ofstream jpegFile(fileName.str(), std::ios::binary);
auto thisErrno = errno;
if (! jpegFile.is_open())
{
throw std::logic_error("Failed to open " + fileName.str() + ": " +
std::strerror(thisErrno));
}
jpegFile.write(theJPEG, theSize);
jpegFile.close();
}
