> On Tue, Oct 10, 2017 at 8:58 PM, Manuel Leuenberger
> <leuenber...@inf.unibe.ch> wrote:
> > Hi,
> >
> > I want to view a PDF within Pharo. I found that Athens has a PDF
canvas, but I have no idea how to use it. Is there a way to view a PDF
within Pharo, so that I can scroll, zoom, click links etc. in the PDF?
> >
> > Cheers,
> > Manuel
On Wed, Oct 11, 2017 at 3:04 AM, Stephane Ducasse <stepharo.s...@gmail.com>
wrote:
>
> Hi manuel
>
> So far I do not know if we have this is Pharo.
> I imagine that we would have to build a renderer once we will have the
> PDF reader from Christian library.
>
> Stef
A renderer will have great synergy with PDFTalk, but I think a proof of
concept can be done independently.
I've been poking at this topic for a while looking for options.
Coincidentally a couple of days I discovered the PDFium library.
I haven't had time yet to give it a run, but it seems a good candidate
since...
* Its a successful commercial product by Foxit built into Chrome converted
to open source with Google's backing for use in Chromium
https://www.foxitsoftware.com/company/press.php?id=305
* Its license is BSD style
https://github.com/hfiguiere/pdfium/tree/master/public
* Although written in C++ it has a C interface
https://github.com/hfiguiere/pdfium/blob/master/public/fpdfview.h
* Search here on " Function: " to skim through
* Proof of concept seems to only need these key functions...
* void FPDF_RenderPageBitmap( FPDF_BITMAP bitmap,FPDF_PAGE
page, ... )
* FPDF_BITMAP FPDFBitmap_Create( int width, int height, int
alpha);
* FPDF_PAGE FPDF_LoadPage ( FPDF_DOCUMENT document, int
page_index )
* FPDF_DOCUMENT FPDF_LoadMemDocument ( const void* data_buf
... )
* void FPDF_InitLibrary ()
* Has a concise getting started for POC...
https://github.com/hfiguiere/pdfium/blob/master/docs/
getting-started.md
* Maybe useful fork with V8 disabled by default
https://github.com/klokantech/pdfium
* Master repo here
https://pdfium.googlesource.com/pdfium/
So Pharo might load a PDF file into a ByteArray, pass that to
FPDF_LoadMemDocument() & FPDF_LoadPage(),
then get a bitmap back from FPDFBitmap_Create() & FPDF_RenderPageBitmap()
and display the result in a Pharo window.
The rest of this week I'm working 12 hour days on a mine site. I could try
it out once I'm home, but in the meantime is anyone else keen to try it?
cheers -ben
