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This comment expands all tabs using an 8-character tab-width. You should ignore this commit when using git blame or use git blame -w. In the early days, I used to use tabs where possible for indentation, since emacs did this automatically. In recent years, I have switched to only using spaces, which means qpdf source code has been a mixture of spaces and tabs. I have avoided cleaning this up because of not wanting gratuitous whitespaces change to cloud the output of git blame, but I changed my mind after discussing with users who view qpdf source code in editors/IDEs that have other tab widths by default and in light of the fact that I am planning to start applying automatic code formatting soon.
116 lines
3.6 KiB
C++
116 lines
3.6 KiB
C++
#include <iostream>
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#include <string.h>
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#include <stdlib.h>
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#include <qpdf/QPDF.hh>
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#include <qpdf/QPDFPageDocumentHelper.hh>
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#include <qpdf/QPDFPageObjectHelper.hh>
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#include <qpdf/QPDFWriter.hh>
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#include <qpdf/QUtil.hh>
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// This program demonstrates use of form XObjects to overlay a page
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// from one file onto all pages of another file. The qpdf program's
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// --overlay and --underlay options provide a more general version of
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// this capability.
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static char const* whoami = 0;
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void usage()
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{
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std::cerr << "Usage: " << whoami << " infile pagefile outfile"
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<< std::endl
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<< "Stamp page 1 of pagefile on every page of infile,"
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<< " writing to outfile"
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<< std::endl;
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exit(2);
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}
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static void stamp_page(char const* infile,
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char const* stampfile,
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char const* outfile)
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{
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QPDF inpdf;
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inpdf.processFile(infile);
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QPDF stamppdf;
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stamppdf.processFile(stampfile);
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// Get first page from other file
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QPDFPageObjectHelper stamp_page_1 =
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QPDFPageDocumentHelper(stamppdf).getAllPages().at(0);
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// Convert page to a form XObject
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QPDFObjectHandle foreign_fo = stamp_page_1.getFormXObjectForPage();
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// Copy form XObject to the input file
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QPDFObjectHandle stamp_fo = inpdf.copyForeignObject(foreign_fo);
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// For each page...
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std::vector<QPDFPageObjectHelper> pages =
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QPDFPageDocumentHelper(inpdf).getAllPages();
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for (std::vector<QPDFPageObjectHelper>::iterator iter = pages.begin();
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iter != pages.end(); ++iter)
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{
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QPDFPageObjectHelper& ph = *iter;
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// Find a unique resource name for the new form XObject
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QPDFObjectHandle resources = ph.getAttribute("/Resources", true);
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int min_suffix = 1;
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std::string name = resources.getUniqueResourceName("/Fx", min_suffix);
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// Generate content to place the form XObject centered within
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// destination page's trim box.
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QPDFMatrix m;
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std::string content =
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ph.placeFormXObject(
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stamp_fo, name, ph.getTrimBox().getArrayAsRectangle(), m);
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if (! content.empty())
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{
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// Append the content to the page's content. Surround the
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// original content with q...Q to the new content from the
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// page's original content.
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resources.mergeResources("<< /XObject << >> >>"_qpdf);
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resources.getKey("/XObject").replaceKey(name, stamp_fo);
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ph.addPageContents(
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QPDFObjectHandle::newStream(&inpdf, "q\n"), true);
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ph.addPageContents(
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QPDFObjectHandle::newStream(&inpdf, "\nQ\n" + content), false);
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}
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// Copy the annotations and form fields from the original page
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// to the new page. For more efficiency when copying multiple
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// pages, we can create a QPDFAcroFormDocumentHelper and pass
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// it in. See comments in QPDFPageObjectHelper.hh for details.
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ph.copyAnnotations(stamp_page_1, m);
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}
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QPDFWriter w(inpdf, outfile);
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w.setStaticID(true); // for testing only
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w.write();
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}
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int main(int argc, char* argv[])
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{
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whoami = QUtil::getWhoami(argv[0]);
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// For libtool's sake....
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if (strncmp(whoami, "lt-", 3) == 0)
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{
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whoami += 3;
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}
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if (argc != 4)
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{
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usage();
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}
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char const* infile = argv[1];
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char const* stampfile = argv[2];
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char const* outfile = argv[3];
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try
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{
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stamp_page(infile, stampfile, outfile);
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}
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catch (std::exception &e)
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{
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std::cerr << whoami << ": " << e.what() << std::endl;
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exit(2);
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}
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return 0;
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}
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