10:14 p.m.
Hi,
I've just checked in a few more "fixes" to Cairo PDF, PS, and, PNG
output. Clipping and masking now work at least at a basic level. Let me
know if you find any problems. Note, evince may not display an object
using an image as a mask but acroread will.
I know of a few more problems with Cairo output:
1. First and last points of closed paths aren't joined properly. At
least in the PS output, the last point is doubled and there is no
closepath.
2. Clipping path output twice in PS (maybe PDF too). The second time it
is unused.
3. Patterns don't always display correctly in PNG output.
Any other problems people know about?
Tav
11:23 p.m.
On Sun, Sep 14, 2008 at 9:14 AM, Tavmjong Bah <tavmjong@...8...> wrote:
1. First and last points of closed paths aren't joined properly.
At
least in the PS output, the last point is doubled and there is no
closepath.
known problem, see the comment in inkscape-cairo.cpp, we're waiting
for cairo to provide a new function to fix this
--
bulia byak
Inkscape. Draw Freely.
http://www.inkscape.org
1:58 a.m.
-----Original Message-----
From: inkscape-devel-bounces(a)lists.sourceforge.net
[mailto:inkscape-devel-bounces@lists.sourceforge.net] On
Behalf Of Tavmjong Bah
Sent: zondag 14 september 2008 15:14
I know of a few more problems with Cairo output:
1. First and last points of closed paths aren't joined
properly. At least in the PS output, the last point is
doubled and there is no closepath.
2. Clipping path output twice in PS (maybe PDF too). The
second time it is unused.
3. Patterns don't always display correctly in PNG output.
Any other problems people know about?
When exporting the attached svg to pdf, the pattern is shifted.
-johan
5:51 a.m.
Exports correctly from mine now as well Johan. Looks like Tavmjong fixed it
:)
2008/9/14 Tavmjong Bah <tavmjong@...8...>
On Sun, 2008-09-14 at 18:58 +0200, J.B.C.Engelen@...1578... wrote:
>
> When exporting the attached svg to pdf, the pattern is shifted.
>
> -johan
Looks correct to me when I do the export... see attached PDF.
Tav
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9:56 p.m.
Hi,
sorry for the late reply. It works indeed, thanks a bunch!
Johan
________________________________
From: john cliff [mailto:john.cliff@...400...]
Sent: zondag 14 september 2008 22:52
To: Tavmjong Bah
Cc: Engelen, J.B.C. (Johan); inkscape-devel(a)lists.sourceforge.net
Subject: Re: [Inkscape-devel] Cairo PDF, PS, and PNG output.
Exports correctly from mine now as well Johan. Looks like Tavmjong fixed it :)
2008/9/14 Tavmjong Bah <tavmjong@...8...>
On Sun, 2008-09-14 at 18:58 +0200, J.B.C.Engelen@...1578... wrote:
When exporting the attached svg to pdf, the pattern is shifted.
-johan
Looks correct to me when I do the export... see attached PDF.
Tav
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8:56 a.m.
Hi, I tried to export the attached svg to pdf and some elements are
missing (the circled numbers). I tried with both 0.46 and trunk (rev
19967). i don't think they use any filter effect, they just are
semi-transparent.
g
On Tue, Sep 30, 2008 at 8:56 AM, <J.B.C.Engelen@...1578...> wrote:
Hi,
sorry for the late reply. It works indeed, thanks a bunch!
Johan
________________________________
From: john cliff [mailto:john.cliff@...400...]
Sent: zondag 14 september 2008 22:52
To: Tavmjong Bah
Cc: Engelen, J.B.C. (Johan); inkscape-devel(a)lists.sourceforge.net
Subject: Re: [Inkscape-devel] Cairo PDF, PS, and PNG output.
Exports correctly from mine now as well Johan. Looks like Tavmjong fixed it
:)
2008/9/14 Tavmjong Bah <tavmjong@...8...>
>
> On Sun, 2008-09-14 at 18:58 +0200, J.B.C.Engelen@...1578... wrote:
>
> >
> > When exporting the attached svg to pdf, the pattern is shifted.
> >
> > -johan
>
> Looks correct to me when I do the export... see attached PDF.
>
> Tav
>
>
>
> -------------------------------------------------------------------------
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> challenge
> Build the coolest Linux based applications with Moblin SDK & win great
> prizes
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> world
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>
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5:26 p.m.
On Sun, 2008-10-05 at 19:56 -0400, Guillaume Pothier wrote:
Hi, I tried to export the attached svg to pdf and some elements are
missing (the circled numbers). I tried with both 0.46 and trunk (rev
19967). i don't think they use any filter effect, they just are
semi-transparent.
g
I don't see the problem. A PDF file made with latest trunk on Linux is
attached.
Tav
1:27 a.m.
Hmm funny, part the problem seems to be with kpdf/okular then, as I
can indeed see the circled numbers in acroread. However, the generated
pdf is very slow to open, both with kpdf and acroread. In the former
the whole page takes about 7 seconds to get (incorrectly) rendered. In
the latter I can see the circled numbers appearing one after another,
like two elements per second; it takes about 5s to render the whole
page.
I imported the generated pdf back into inkscape, and it seems the
structure just isn't right. There is an awful lot of nested groups
that contain only one leaf element. Many of those are paths filled
with a pattern, it seems those patterns are the circled numbers. It
seems the main image is also a pattern-filled path with some clipping.
There are also a lot of clip paths and masks being used. If the
structure of the imported svg reflects the structure of the pdf, then
I'm not surprised rendering is so slow and the pdf is so big. Any idea
why is this rather simple svg transformed into such a complex pdf?
Cheers,
g
On Mon, Oct 6, 2008 at 4:26 AM, Tavmjong Bah <tavmjong@...8...> wrote:
On Sun, 2008-10-05 at 19:56 -0400, Guillaume Pothier wrote:
> Hi, I tried to export the attached svg to pdf and some elements are
> missing (the circled numbers). I tried with both 0.46 and trunk (rev
> 19967). i don't think they use any filter effect, they just are
> semi-transparent.
> g
I don't see the problem. A PDF file made with latest trunk on Linux is
attached.
Tav
1:49 a.m.
On Mon, Oct 6, 2008 at 12:27 PM, Guillaume Pothier <gpothier@...400...> wrote:
Hmm funny, part the problem seems to be with kpdf/okular then, as I
can indeed see the circled numbers in acroread. However, the generated
pdf is very slow to open, both with kpdf and acroread. In the former
the whole page takes about 7 seconds to get (incorrectly) rendered. In
the latter I can see the circled numbers appearing one after another,
like two elements per second; it takes about 5s to render the whole
page.
Most likely because cairo had to rasterize some parts of image that
cannot be in PDF.
I imported the generated pdf back into inkscape, and it seems the
structure just isn't right. There is an awful lot of nested groups
that contain only one leaf element. Many of those are paths filled
with a pattern, it seems those patterns are the circled numbers. It
seems the main image is also a pattern-filled path with some clipping.
There are also a lot of clip paths and masks being used. If the
structure of the imported svg reflects the structure of the pdf, then
I'm not surprised rendering is so slow and the pdf is so big. Any idea
why is this rather simple svg transformed into such a complex pdf?
The structure of the output PDF is the responsibility of cairo.
Inkscape feeds it the document without changing its structure in any
way, just converting SVG objects to cairo calls. Everything else (such
turning things to patterns) is cairo business; I don't know the reason
but there should be some reason I guess. You may want to ask on the
cairo list.
--
bulia byak
Inkscape. Draw Freely.
http://www.inkscape.org
4:02 a.m.
Most likely because cairo had to rasterize some parts of image that
cannot be in PDF.
It doesn't seem that anything beyond the original bitmap image was
rasterized, just placed into patterns.
The structure of the output PDF is the responsibility of cairo.
Ok, I'll rebuild inkscape with a more recent version of cairo, and if
the problem persists I'll see with the cairo guys.
Thanks for the explanations!
g
7:02 p.m.
Guillaume Pothier wrote:
Hmm funny, part the problem seems to be with kpdf/okular then, as I
can indeed see the circled numbers in acroread.
Generally when you are having issues with a PDF file is is best to check
it with acroread. Many PDF viewers do not have complete support for
everything in the PDF Reference.
However, the generated
pdf is very slow to open, both with kpdf and acroread. In the former
the whole page takes about 7 seconds to get (incorrectly) rendered. In
the latter I can see the circled numbers appearing one after another,
like two elements per second; it takes about 5s to render the whole
page.
What is happening here is you are drawing circles with a fill and stroke
and an opacity of 86%. To achieve this effect in cairo requires drawing
the fill and stroke in a group then painting the group through a mask
with alpha = 86%. In the PDF file there is a group for the fill and
stroke of the circle that is painted through a soft mask containing a
solid fill with alpha = 86%.
The reason for the slow rendering is that currently cairo creates this
group and smask with the size of the page. The problem for PDF viewers
is that they need to render the fill and stroke to an image the size of
the page then composite the image though an smask the size of the page.
Obviously this is not ideal. Cairo should create groups with the exact
size of the group. This is something I intend to fix.
I imported the generated pdf back into inkscape, and it seems the
structure just isn't right. There is an awful lot of nested groups
that contain only one leaf element. Many of those are paths filled
with a pattern, it seems those patterns are the circled numbers. It
seems the main image is also a pattern-filled path with some clipping.
The PDF structure that cairo writes is not optimized for importing. This
is something that I intend to fix. I have previously focussed on
eliminating unnecessary rasterization in the cairo PDF output. Now that
work is complete I can do more to optimize the PDF output.
10:02 p.m.
On Tue, Oct 7, 2008 at 6:02 AM, Adrian Johnson <ajohnson@...1679...> wrote:
The PDF structure that cairo writes is not optimized for importing.
This is
something that I intend to fix. I have previously focussed on eliminating
unnecessary rasterization in the cairo PDF output. Now that work is complete
I can do more to optimize the PDF output.
Thanks Adrian now I understand the issue much better! Please keep us
posted when you have some progress on this front!
Cheers,
g
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6 participants
participants (6)
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Adrian Johnson -
bulia byak -
Guillaume Pothier -
john cliff -
Tavmjong Bah