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How to insert a picture in the PDF file only once
https://forum.pdfsharp.net/viewtopic.php?f=2&t=3397		 Page 1 of 1
Author:  riccardo [ Wed Jul 27, 2016 11:07 am ]
Post subject:  How to insert a picture in the PDF file only once
How to insert a picture in the PDF file only once and show it on all pages

I saved a invoice of 10 pages without logo.
After that i add to the invoice a jpg of 10Kb as logo.

The result file size grows of 100Kb.

But when I print my document (without use PDFSharp)
on a pdf printer virtual driver such as BullZip, PrimoPDF, PdfFactory,
the file size growns only by 10Kb regardless of the number of pages.

Thanks
Author:  Thomas Hoevel [ Wed Jul 27, 2016 11:16 am ]
Post subject:  Re: How to insert a picture in the PDF file only once and sh
Hi!

You do not show any code and no PDF file.
viewtopic.php?f=2&t=832

When using PDFsharp as intended, the image will be included only once, even if it is referenced on many pages.

If you create a single XImage and use that on all pages then there will be no problems.
Author:  riccardo [ Wed Jul 27, 2016 12:42 pm ]
Post subject:  Re: How to insert a picture in the PDF file only once and sh
Thomas Hoevel wrote:
If you create a single XImage and use that on all pages then there will be no problems.


This is probably my problem: I create view objects for each page

I will try to reuse XImage objects

Thank you very much again
Author:  Thomas Hoevel [ Wed Jul 27, 2016 12:59 pm ]
Post subject:  Re: How to insert a picture in the PDF file only once
There shouldn't be duplicates either when the same filename is used for all XImage objects.

BTW: do you get an increase of 50 kB for a document with 5 invoices?
If not then maybe there is a different issue.
Author:  riccardo [ Wed Jul 27, 2016 2:44 pm ]
Post subject:  Re: How to insert a picture in the PDF file only once
Thomas Hoevel wrote:
There shouldn't be duplicates either when the same filename is used for all XImage objects.


Unfortunately I create the image from a BITMAPINFO* (C++/CLI)

//PDFSharp does not support 16bit
Bitmap^ AdjustBitDepth(Bitmap^ image)
{
Bitmap^ newImage = nullptr;
switch (image->PixelFormat)
{
case PixelFormat::Format16bppRgb555:
newImage = image->Clone(System::Drawing::Rectangle(0, 0, image->Width, image->Height), PixelFormat::Format32bppRgb);
break;
case PixelFormat::Format16bppRgb565:
newImage = image->Clone(System::Drawing::Rectangle(0, 0, image->Width, image->Height), PixelFormat::Format32bppRgb);
break;
case PixelFormat::Format16bppArgb1555:
newImage = image->Clone(System::Drawing::Rectangle(0, 0, image->Width, image->Height), PixelFormat::Format32bppArgb);
break;
}

if (newImage == nullptr)
return image;

delete image;
return newImage;
}

////////////////////////////////////////////////////////////////////////////

XImage^ FromMetaRecord(BITMAPINFO* pInfo, BYTE* bitmapBytes)
{
Gdiplus::GpBitmap *bitmap = NULL;

Gdiplus::DllExports::GdipCreateBitmapFromGdiDib(pInfo, bitmapBytes, &bitmap);

System::Reflection::MethodInfo^ mi = Bitmap::typeid->GetMethod("FromGDIplus", System::Reflection::BindingFlags::Static | System::Reflection::BindingFlags::NonPublic);

Bitmap ^image = (Bitmap^)mi->Invoke(nullptr, gcnew cli::array<Object^> { IntPtr(bitmap) });

image = AdjustBitDepth(image);

XImage^ xImage = XImage::FromGdiPlusImage(image);

return xImage;
}

I am studying a methods to compare BITMAP objects to reuse the same XImage

Thomas Hoevel wrote:
BTW: do you get an increase of 50 kB for a document with 5 invoices?

Yes, its size grows proportional with page number and image size
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