View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0011500 | Scribus | Import / Export | public | 2013-04-19 04:53 | 2016-02-20 08:12 |
| Reporter | christoph_s | Assigned To | fschmid | ||
| Priority | normal | Severity | feature | Reproducibility | have not tried |
| Status | assigned | Resolution | open | ||
| Product Version | 1.5.0svn | ||||
| Summary | 0011500: Enable import of PDF layers | ||||
| Description | Scribus does an excellent job at exporting PDF layers, but reconstruction of PDF layers upon opening a PDF file (in contrast to importing it as a vector or image file) isn't available yet (perhaps due to limitations of PoDoFo?). | ||||
| Tags | upstream | ||||
| Patch | |||||
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PDF does not have layers as defined in Scribus, Indesign or Photoshop. PDF has what is called in specs "Optional content group". They are available since PDF 1.5. So basically layers are translated to a specific type of groups whose view can be enabled or disabled by users when exporting to PDF 1.5 and enabling specific option. In other cases, the output has lost all notions of layers. The trick also is that PDF can have "Optional content group" embedded in other "Optional content group" and this is where they are different from layers. That means we can translate our layers to PDF "Optional content groups" but "Optional content groups" can not be necessarily converted back to layers, except the top one... In specific case, even the top one may not be converted to layer. Fyi PoDoFo is not used when importing PDF, most of the work is done using poppler when available. When not available, the PDF goes the EPS/PS way through Ghostscript in which case any notion of layers is of course lost. |
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To a certain extend this works already, but these "Optional content" stuff can be quite tricky. Poppler library has only limited support for this. I had send a patch to improve this, but it was only included in a crippled form with the remark "Do not use the poppler lib directly". Unless these guys do not rethink their usage policy for their library i won't send any more patches to them. |
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Franz, I can't find the patch on their bugtracker. Can you direct me to it ? |
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poppler_marked_content.diff (2,310 bytes)
diff -U 3 -H -d -r -N -x '.*' -- Entwicklung/poppler-0.19.4/poppler/Gfx.cc Downloads/poppler-0.19.4/poppler/Gfx.cc
--- Entwicklung/poppler-0.19.4/poppler/Gfx.cc 2012-04-24 19:10:58.000000000 +0200
+++ Downloads/poppler-0.19.4/poppler/Gfx.cc 2012-04-27 21:21:38.000000000 +0200
@@ -4969,6 +4969,7 @@
if ( res->lookupMarkedContentNF( name1, &markedContent ) ) {
bool visible = contentConfig->optContentIsVisible(&markedContent);
mc->ocSuppressed = !(visible);
+ out->beginMarkedContent(args[0].getName(), &markedContent);
} else {
error(errSyntaxError, getPos(), "DID NOT find {0:s}", name1);
}
@@ -4993,6 +4994,10 @@
printf("\n");
fflush(stdout);
}
+
+ if(numArgs == 2 && args[1].isDict()) {
+ out->beginMarkedContent(args[0].getName(),args[1].getDict());
+ }
ocState = !contentIsHidden();
}
@@ -5010,6 +5015,7 @@
if (mcKind == gfxMCActualText)
out->endActualText(state);
+ out->endMarkedContent(state);
ocState = !contentIsHidden();
}
diff -U 3 -H -d -r -N -x '.*' -- Entwicklung/poppler-0.19.4/poppler/OutputDev.cc Downloads/poppler-0.19.4/poppler/OutputDev.cc
--- Entwicklung/poppler-0.19.4/poppler/OutputDev.cc 2012-04-25 18:48:12.000000000 +0200
+++ Downloads/poppler-0.19.4/poppler/OutputDev.cc 2012-04-27 21:20:09.000000000 +0200
@@ -157,6 +157,15 @@
drawImage(state, ref, str, width, height, colorMap, interpolate, NULL, gFalse);
}
+void OutputDev::endMarkedContent(GfxState *state) {
+}
+
+void OutputDev::beginMarkedContent(char *name, Dict *properties) {
+}
+
+void OutputDev::beginMarkedContent(char *name, Object *dictRef ) {
+}
+
void OutputDev::markPoint(char *name) {
}
diff -U 3 -H -d -r -N -x '.*' -- Entwicklung/poppler-0.19.4/poppler/OutputDev.h Downloads/poppler-0.19.4/poppler/OutputDev.h
--- Entwicklung/poppler-0.19.4/poppler/OutputDev.h 2012-04-25 18:47:59.000000000 +0200
+++ Downloads/poppler-0.19.4/poppler/OutputDev.h 2012-04-27 21:20:21.000000000 +0200
@@ -272,6 +272,9 @@
//----- grouping operators
+ virtual void endMarkedContent(GfxState *state);
+ virtual void beginMarkedContent(char *name, Dict *properties);
+ virtual void beginMarkedContent(char *name, Object *dictRef );
virtual void markPoint(char *name);
virtual void markPoint(char *name, Dict *properties);
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Uploaded the original patch to poppler 0.19.4, no idea if it still can be applied. |
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Looks like some of the patch was implemented: http://cgit.freedesktop.org/poppler/poppler/tree/poppler/Gfx.cc#n5167 |
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william, if you get a moment, could you provide any feedback here? Perhaps if needed help with implementing the rest of the functionality that Franz wrote into an updated patch ? |
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JFYI: https://helpx.adobe.com/indesign/using/placing-graphics.html#control_layer_visibility_in_imported_images |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2013-04-19 04:53 | christoph_s | New Issue | |
| 2013-04-19 04:53 | christoph_s | Status | new => assigned |
| 2013-04-19 04:53 | christoph_s | Assigned To | => fschmid |
| 2013-04-19 09:03 | jghali | Note Added: 0030091 | |
| 2013-04-19 19:25 | fschmid | Note Added: 0030094 | |
| 2013-04-20 10:44 | jghali | Severity | minor => feature |
| 2015-12-07 18:43 | Kunda | Note Added: 0037855 | |
| 2015-12-07 18:43 | Kunda | Tag Attached: upstream | |
| 2015-12-07 21:32 | fschmid | File Added: poppler_marked_content.diff | |
| 2015-12-07 21:33 | fschmid | Note Added: 0037867 | |
| 2015-12-08 06:43 | Kunda | Note Added: 0037872 | |
| 2016-01-28 22:24 | Kunda | Note Added: 0038482 | |
| 2016-02-20 08:12 | christoph_s | Note Added: 0038849 |
