I'm looking into calling PDFium from Pharo via FFI. Currently I'm stalled a bit since it doesn't have a shared-library target. If you consider access to such a library would be useful to the community, please take a few moments to star this issue... https://bugs.chromium.org/p/pdfium/issues/detail?id=826 cheers -ben P.S. Can anyone comment on calling into a static library via FFI? On Wed, Oct 11, 2017 at 2:05 PM, Ben Coman <btc@openinworld.com> wrote:
On Wed, Oct 11, 2017 at 2:03 PM, Ben Coman <btc@openinworld.com> wrote:
On Tue, Oct 10, 2017 at 8:58 PM, Manuel Leuenberger <leuenberger@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.self@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
[Edit: Update license link]
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/blob/master/LICENSE <https://github.com/hfiguiere/pdfium/blob/master/LICENSE>* * 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