There are two functions to render a PopplerPage on a cairo surface: poppler_page_render and poppler_page_render_for_printing. The documentation states that the latter should be used "to render a page that will be printed".
My question is: which one of these should I use if my cairo surface will be later saved as a (pdf) file? Does saving as a file constitute a poppler "printing"? I would appreciate a reference to documentation.
Does it matter that the PopplerPage was created from a pdf file by poppler_document_get_page?
Looking at poppler's source code, the difference is, for example, that annotations are displayed, but not printed:
http://sources.debian.net/src/poppler/0.44.0-3/glib/poppler-page.cc/?hl=362#L362
http://sources.debian.net/src/poppler/0.44.0-3/glib/poppler-page.cc/?hl=309#L309
Related
I try to add a thumbnail to a JPEG picture using libexif.
For now I'm borrowing the code from exif (the command line tool that is shipped by the libexif team).
However I noticed the XMP tags get deleted from the metadata. There is an old bugreport here.
I tried to see how to achieve this anyway with libexif but I don't really understand how to get the XMP from input file and put it in the output file. I just want to copy all XMP data, I don't need to extract anything of it.
I saw there is a TAG EXIF_TAG_XML_PACKET in exif_tag.h but couldn't figure out how to read/write this tag.
A related solution is in this SO answer but it looks complicated. I'm not familiar coding in C.
Is it actually possible to keep all XMP when using only libexif API? Have things changed in recent years on that? How would you write this in code?
Thanks
I believe it should be somewhat straightforward. XMP fields are described in the ISO/Adobe standard. Regular Kotlin/Java/Android file I/O and some string manipulation should be all that is required.
I would start out by becoming intimately familiar with ISO 16684-1:2019. Then, write a method for your jpeg file class that grabs all the XMP fields. Store those fields in a temp file (to prevent difficult to recover data loss in the event of your code or libexif crashing). Hand the file off to libexif. Generate the thumbnail. Finally, when that's done you can restore the XMP fields. If the thumbnail is stored in an XMP field as well (and it sounds like it is), it may be easier to concatenate that field with the other ones which were already grabbed, updating the temp file so that it contains EVERY XMP field, before adding all of the XMP fields back to the jpeg.
Unfortunately, I do not currently have the time to read a 50 page ISO standard, synthesize the information, and then write the code to implement the solution. Here's a link to the standard at least, to get you started.
https://www.iso.org/obp/ui/#iso:std:iso:16684:-1:ed-2:v1:en
I want to make a network graph which shows the distribution of our documents in our folder structure.
I have the nodefile, edgefile and gephi graph file in this location:
https://1drv.ms/f/s!AuVfRBdVHkO7hgs5K9r9f7jBBAUH
What I do is:
Run the algorithm ForceAtlas2 with scaling 10-20, dissuade hub marked and prevent overlap marked, all other standard setting.
What I get is a graph with groups radial/spherical distributed. However, what I want is a tree directed network graph.
Anyone know how I can adjust Gephi to make this?
Thanks!
I just found a solution.
I tested the file format as shown on the Yed site "import excel file" page
http://yed.yworks.com/support/manual/import_excel.html
This gave me the Yed import dialog (took a life time to figure out that it's a pop up menu and not selectable through the standard menu)
Anyway, it worked and I've adjusted the test files with the data prepared for the Gehpi. This was pretty easy, I could used the source target ID's etc. Just copy paste.
I load it into Yed and used some directed and radial clustering algorithms on it. Works fine!
Below you can find the excel node/edge file used to import in Yed and the graph file you can open with Yed to see the final radial result.
https://1drv.ms/f/s!AuVfRBdVHkO7hg6DExK_eVkm5_mR
Only thing to figure out is how to combine the weight (which represents the number of documents) with the node size.
Unfortunately, as of version 0.9.0, Gephi no longer supports hierarchical graphs. Maybe try using a previous version?
Other alternatives involve more complex software, such as Graphviz, but you need a .dot file instead of your .csv. I looked all over, but could not find an easy-to-use csv to dot converter.
You could try looking at d3-hierarchy, a node.js program, but then again you need to use the not-so-user-friendly npm. If you look at the link, it looks like it can produce the kind of diagram you're looking for.
I need help trying to find a utility or method to search for annotations (filled rectangles) in tiff files and determine their coordinates. I'm not a programmer, but I'm profficient with vbscript and powershell....any suggestions would be greatly appreciated.
I'm not very familiar with the TIFF specification as you can probably tell....i've downloaded the specs from adobe, but can't make heads or tails of what i need.
i have looked at the following related post:
Tiff annotations
it suggested looking at:
http://web.archive.org/web/20030124024322/http://www5.eistream.com/support_pro/faqs/annospec.htm
which says that annotations are referenced in tag 32932....however, i've used libtiff.org's tiffinfo.exe to view the tags associated with a test file (that has an annotation).....it does not show tag 32932.
so that's where I'm at. again thanks in advance.
Say I've written a class in a package, called mypackage.myclass. I've written my own HTML documentation for the package and the class, and have included this within the MATLAB help browser as described in the MATLAB documentation.
I can display this HTML documentation by using the help browser to navigate directly to it, but typing doc mypackage.myclass does not display it; instead it displays some HTML documentation that is auto-generated by helpwin (which is a nice feature, but not what I want - the auto-generated documentation is too techy for my users).
How can I force doc to display my documentation, rather than the auto-generated documentation?
Equivalently:
When you run doc docTopic, inside the doc command the Java class com.mathworks.mlservices.MLHelpServices.showReferencePage(docTopic) gets called. If a reference page for docTopic exists, it displays it and returns a success value. If a reference page doesn't exist, it returns a failure value, which then causes helpwin(docTopic) to get called. Somewhere there must be some catalog that connects values of docTopic with individual reference HTML files. How can I fiddle with that catalog - or can I create one for my package?
MathWorkers and #Yair, please give me enough undocumented rope to hang myself with :)
As far as I know this is not possible and not intended by MathWorks. I don't know of an undocumented way of doing this either. As far as I remember the keywords for doc are hard-coded somewhere.
Depending on your setup you can try the following: Prepare your own doc command that uses web(..., '-helpbrowser') to display HTML pages in MATLAB's help browser:
function doc(topic)
my_topics = {
'foo', 'foo.html'
'bar', 'bar/help/intro.html'
};
for i = 1 : size(my_topics, 1)
if strcmpi(topic, my_topics{i, 1})
web(my_topics{i, 2}, '-helpbrowser');
return;
end
end
% Fall back to MATLAB's doc. Note that our doc shadows MATLAB's doc.
docs = which('doc', '-all');
old_dir = cd();
c = onCleanup(#() cd(old_dir));
cd(fileparts(docs{2}));
doc(topic);
end
If you put that function in a file doc.m and put the corresponding directory at the beginning of the MATLAB path (see help addpath) then it will be called instead of the built-in doc.
Of course you could use some other place to store your custom doc mapping (a file, for instance) or use some kind of dynamic lookup scheme.
UPDATE: As of MATLAB R2012b, the '-helpbrowser' option of web is undocumented. This is probably related to the GUI changes in that MATLAB version, which also include the help browser. web(..., '-helpbrowser') still works as intended, but that may change in future versions of MATLAB. As far as I know, there is no documented way of opening any HTML page in the help browser in R2012b.
I want to create a rotating object with 3d effect , I am using the sample project iPhoneGLEssentials provided by developer.apple.com. In the sample project demon.model file is used , I need to create my own .model file. Can any one help me how to create the required .model file?
You can see from the source for that demo that's not a common format. It just has the arrays for positions, normals, texcoords and element indices. You can see how it is read from the .model file in the moduleUtil.h. You can search online for libraries that can load specific formats for models. Engines like irrlicht has support for many formats such as .3ds, and .x. You can start from checking there.