[cairo] painting bitmaps onto a PDF surface

[Arjen Nienhuis]

On Jun 21, 2013 6:42 PM, "Ratner, Logan" <logan.ratner at bluware.com> wrote:
>
> I started to create the images to show the problem, and discovered that
the problem isn't where I thought it was.  What I describe below works.
 So, next question:  Is this mailing list the right place for Poppler
issues?

Might be, if its poppler with cairo.

>
> Logan
>
> ________________________________________
> From: Arjen Nienhuis
> Sent: Thursday, June 20, 2013 2:12 PM
> To: Ratner, Logan
> Cc: cairo at cairographics.org
> Subject: Re: [cairo] painting bitmaps onto a PDF surface
>
> On Thu, Jun 20, 2013 at 7:37 PM, Ratner, Logan <logan.ratner at bluware.com>
wrote:
> > Hello,
> >
> > I am using Cairomm to create some images.  I am trying to paint an
> > ImageSurface onto a device surface, having written data into the
surface.
> > I'm doing this two ways, either by setting the ImageSurface as the
source
> > directly, or by creating a SurfacePattern from the ImageSurface.  The
image
> > has two colors, one of which has an alpha of 0.
> >
> > Either way works fine if I use a PNG device surface, but if I try the
exact
> > same thing with a PDF device surface, the "invisible" color isn't
invisible.
>
> Can you show us the "I expected this" and the "I got this instead" images?
>
> >
> > As I research this I go back and forth between "this should just work"
and
> > "this is impossible" but surely there is a way to do what I need.
> >
> > Here's what I'm trying:
> >
> > RefPtr<ImageSurface> csurf = ImageSurface::create(FORMAT_ARGB32,
s.height,
> > s.width);
> > /* code to write the image surface */
> > RefPtr<SurfacePattern> fillpat = SurfacePattern::create(csurf)
> > fillpat->set_extend(EXTEND_REPEAT);
> > ctx.set_source(fillpat);
> > ctx.paint();
> >
> > Or:
> >
> > RefPtr<ImageSurface> csurf = ImageSurface::create(FORMAT_ARGB32,
s.height,
> > s.width);
> > /* code to write the image surface */
> > ctx.set_source(meshimage, 0, 0);
> > ctx.paint();
> >
> > Any help would be much appreciated.
> > Thanks in advance,
> >
> > Logan
> >
> > --
> > Logan Ratner | Senior Consultant | Bluware Inc.
> > 16285 Park 10 Place Suite 300, Houston, TX 77084
> > logan.ratner at bluware.com | P: 713.335.1524
> > www.bluware.com | We bring your vision to code.
> >
> >
> >
> > --
> > cairo mailing list
> > cairo at cairographics.org
> > http://lists.cairographics.org/mailman/listinfo/cairo
>
>
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