Thanks for your reply
Yes the simple case was a jpeg image, LoadFromBuffer looks like what I
need, thanks.
I have two more advanced case of Deflate/CCITT compressed images. In
0.9.x, deflate was implemented as follows, where buf holds the raw image
data:
PoDoFo::PdfMemoryInputStream is(buf.data(), buf.size());
pdfImage.SetImageData(width, height, sampleSize, &is,
{PoDoFo::ePdfFilter_FlateDecode});
which I translated to 0.10.x as
PoDoFo::PdfImageInfo info;
info.Width = width;
info.Height = height;
info.ColorSpace = colorSpace; //
PoDoFo::PdfColorSpace::DeviceRGB or PoDoFo::PdfColorSpace::DeviceGray
info.BitsPerComponent = sampleSize; // 8 or 1
info.Filters = {PoDoFo::PdfFilterType::FlateDecode};
pdfImage->SetDataRaw(PoDoFo::bufferview(buf.data(),
buf.size()), info);
which however aborts here in
PdfStreamedObjectStream::GetInputStream(PdfObject& obj) with
PODOFO_RAISE_ERROR_INFO(PdfErrorCode::NotImplemented, "Unsupported
reading from streamed object stream");
The CCITT code, implemented in 0.9.x as
PoDoFo::PdfName
faxFilterName(PoDoFo::PdfFilterFactory::FilterTypeToName(PoDoFo::ePdfFilter_CCITTFaxDecode));
CCITTFax4Encoder encoder;
uint8_t* encoded = /* image data */;
uint32_t encodedLen = /* image data length */;
pdfImage.GetObject()->GetDictionary().AddKey(PoDoFo::PdfName::KeyFilter,
faxFilterName);
PoDoFo::PdfDictionary decodeParams;
decodeParams.AddKey("Columns",
PoDoFo::PdfObject(PoDoFo::pdf_int64(img.width())));
decodeParams.AddKey("Rows",
PoDoFo::PdfObject(PoDoFo::pdf_int64(img.height())));
decodeParams.AddKey("K",
PoDoFo::PdfObject(PoDoFo::pdf_int64(-1))); // K < 0 --- Pure
two-dimensional encoding (Group 4)
pdfImage.GetObject()->GetDictionary().AddKey("DecodeParms",
PoDoFo::PdfObject(decodeParams));
PoDoFo::PdfMemoryInputStream
is(reinterpret_cast<char*>(encoded), encodedLen);
pdfImage.SetImageDataRaw(img.width(), img.height(),
pixelFormat, &is);
which I attempted to port to 0.10.x as
PoDoFo::PdfDictionary decodeParams;
decodeParams.AddKey("Columns",
PoDoFo::PdfObject(int64_t(img.width())));
decodeParams.AddKey("Rows",
PoDoFo::PdfObject(int64_t(img.height())));
decodeParams.AddKey("K", PoDoFo::PdfObject(int64_t(-1))); // K
< 0 --- Pure two-dimensional encoding (Group 4)
pdfImage->GetDictionary().AddKey("DecodeParms",
PoDoFo::PdfObject(decodeParams));
PoDoFo::PdfImageInfo info;
info.Width = width;
info.Height = height;
info.ColorSpace = colorSpace;
info.BitsPerComponent = sampleSize;
info.Filters = {PoDoFo::PdfFilterType::CCITTFaxDecode};
pdfImage->SetDataRaw(PoDoFo::bufferview(reinterpret_cast<const
char*>(encoded), encodedLen), info);
also aborts with "Unsupported reading from streamed object stream".
Could you give me a pointer how to translate these?
Many thanks
Sandro
On 14.07.23 17:15, Francesco Pretto wrote:
Are you trying to load a PdfImage from a jpeg image? If so, you should
use PdfImage::LoadFromBuffer(buffer), which will automatically fill the image
with the jpeg content. PdfImage::SetData(buffer, width, height, format)
is specialized to load an image from raw pixel data, as the PdfPixelFormat
enum parameter should have suggested. It's a new feature in 0.10.x.
Other input definitions are supported through
PdfImage::SetDataRaw(buffer, info), but not recommended for users that
don't know what they are doing.
On Fri, 14 Jul 2023 at 16:46, Sandro Mani <manisan...@gmail.com> wrote:
Hi
I'm migrating some podofo-0.9.x code to 0.10.x. I have code writing
encoded image streams like this:
QByteArray data;
QBuffer buffer(&data);
img.save(&buffer, "jpg", settings.compressionQuality);
PoDoFo::PdfName
dctFilterName(PoDoFo::PdfFilterFactory::FilterTypeToName(PoDoFo::ePdfFilter_DCTDecode));
pdfImage.GetObject()->GetDictionary().AddKey(PoDoFo::PdfName::KeyFilter,
dctFilterName);
PoDoFo::SpanStreamDevice is(data.data(), data.size());
pdfImage->SetData(is, width, height, pixelFormat);
which I'm having difficulties to adapt to 0.10.x as the API changed
substantially here. Can someone provide an example?
Thanks
Sandro
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