diff options
author | Jay Berkenbilt <ejb@ql.org> | 2019-01-26 23:33:06 +0100 |
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committer | Jay Berkenbilt <ejb@ql.org> | 2019-01-27 13:50:30 +0100 |
commit | 2d1db060422eabb82aaa1764926a3f9e881116e2 (patch) | |
tree | a3915a98112e2705ad4fe92ab9587534a47bc619 /examples | |
parent | 623f5b664ece02027b550bec085fc9c6486986ff (diff) | |
download | qpdf-2d1db060422eabb82aaa1764926a3f9e881116e2.tar.zst |
Example of form XObject, page overlay
Diffstat (limited to 'examples')
-rw-r--r-- | examples/build.mk | 3 | ||||
-rw-r--r-- | examples/pdf-overlay-page.cc | 110 | ||||
-rw-r--r-- | examples/qtest/overlay-page.test | 28 | ||||
-rw-r--r-- | examples/qtest/overlay-page/in.pdf | bin | 0 -> 1840 bytes | |||
-rw-r--r-- | examples/qtest/overlay-page/out.pdf | bin | 0 -> 3361 bytes | |||
-rw-r--r-- | examples/qtest/overlay-page/stamp.pdf | bin | 0 -> 799 bytes |
6 files changed, 140 insertions, 1 deletions
diff --git a/examples/build.mk b/examples/build.mk index 031601ff..8033d7d2 100644 --- a/examples/build.mk +++ b/examples/build.mk @@ -9,7 +9,8 @@ BINS_examples = \ pdf-split-pages \ pdf-filter-tokens \ pdf-count-strings \ - pdf-set-form-values + pdf-set-form-values \ + pdf-overlay-page CBINS_examples = pdf-linearize TARGETS_examples = $(foreach B,$(BINS_examples) $(CBINS_examples),examples/$(OUTPUT_DIR)/$(call binname,$(B))) diff --git a/examples/pdf-overlay-page.cc b/examples/pdf-overlay-page.cc new file mode 100644 index 00000000..88722352 --- /dev/null +++ b/examples/pdf-overlay-page.cc @@ -0,0 +1,110 @@ +#include <iostream> +#include <string.h> +#include <stdlib.h> +#include <qpdf/QPDF.hh> +#include <qpdf/QPDFPageDocumentHelper.hh> +#include <qpdf/QPDFPageObjectHelper.hh> +#include <qpdf/QPDFWriter.hh> +#include <qpdf/QUtil.hh> + +// This program demonstrates use of form XObjects to overlay a page +// from one file onto all pages of another file. The qpdf program's +// --overlay and --underlay options provide a more general version of +// this capability. + +static char const* whoami = 0; + +void usage() +{ + std::cerr << "Usage: " << whoami << " infile pagefile outfile" + << std::endl + << "Stamp page 1 of pagefile on every page of infile," + << " writing to outfile" + << std::endl; + exit(2); +} + +static void stamp_page(char const* infile, + char const* stampfile, + char const* outfile) +{ + QPDF inpdf; + inpdf.processFile(infile); + QPDF stamppdf; + stamppdf.processFile(stampfile); + + // Get first page from other file + QPDFPageObjectHelper stamp_page_1 = + QPDFPageDocumentHelper(stamppdf).getAllPages().at(0); + // Convert page to a form XObject + QPDFObjectHandle foreign_fo = stamp_page_1.getFormXObjectForPage(); + // Copy form XObject to the input file + QPDFObjectHandle stamp_fo = inpdf.copyForeignObject(foreign_fo); + + // For each page... + std::vector<QPDFPageObjectHelper> pages = + QPDFPageDocumentHelper(inpdf).getAllPages(); + for (std::vector<QPDFPageObjectHelper>::iterator iter = pages.begin(); + iter != pages.end(); ++iter) + { + QPDFPageObjectHelper& ph = *iter; + + // Find a unique resource name for the new form XObject + QPDFObjectHandle resources = ph.getAttribute("/Resources", true); + int min_suffix = 1; + std::string name = resources.getUniqueResourceName("/Fx", min_suffix); + + // Generate content to place the form XObject centered within + // destination page's trim box. + std::string content = + ph.placeFormXObject( + stamp_fo, name, ph.getTrimBox().getArrayAsRectangle()); + if (! content.empty()) + { + // Append the content to the page's content. Surround the + // original content with q...Q to the new content from the + // page's original content. + resources.mergeResources( + QPDFObjectHandle::parse("<< /XObject << >> >>")); + resources.getKey("/XObject").replaceKey(name, stamp_fo); + ph.addPageContents( + QPDFObjectHandle::newStream(&inpdf, "q\n"), true); + ph.addPageContents( + QPDFObjectHandle::newStream(&inpdf, "\nQ\n" + content), false); + } + } + + QPDFWriter w(inpdf, outfile); + w.setStaticID(true); // for testing only + w.write(); +} + +int main(int argc, char* argv[]) +{ + whoami = QUtil::getWhoami(argv[0]); + + // For libtool's sake.... + if (strncmp(whoami, "lt-", 3) == 0) + { + whoami += 3; + } + + if (argc != 4) + { + usage(); + } + char const* infile = argv[1]; + char const* stampfile = argv[2]; + char const* outfile = argv[3]; + + try + { + stamp_page(infile, stampfile, outfile); + } + catch (std::exception &e) + { + std::cerr << whoami << ": " << e.what() << std::endl; + exit(2); + } + return 0; +} diff --git a/examples/qtest/overlay-page.test b/examples/qtest/overlay-page.test new file mode 100644 index 00000000..68e695d3 --- /dev/null +++ b/examples/qtest/overlay-page.test @@ -0,0 +1,28 @@ +#!/usr/bin/env perl +require 5.008; +use warnings; +use strict; + +chdir("overlay-page"); + +require TestDriver; + +my $td = new TestDriver('overlay-page'); + +cleanup(); + +$td->runtest("overlay-page", + {$td->COMMAND => "pdf-overlay-page in.pdf stamp.pdf a.pdf"}, + {$td->STRING => "", $td->EXIT_STATUS => 0}); +$td->runtest("compare files", + {$td->FILE => "a.pdf"}, + {$td->FILE => "out.pdf"}); + +cleanup(); + +$td->report(2); + +sub cleanup +{ + unlink("a.pdf"); +} diff --git a/examples/qtest/overlay-page/in.pdf b/examples/qtest/overlay-page/in.pdf Binary files differnew file mode 100644 index 00000000..f94c739a --- /dev/null +++ b/examples/qtest/overlay-page/in.pdf diff --git a/examples/qtest/overlay-page/out.pdf b/examples/qtest/overlay-page/out.pdf Binary files differnew file mode 100644 index 00000000..b589d2c4 --- /dev/null +++ b/examples/qtest/overlay-page/out.pdf diff --git a/examples/qtest/overlay-page/stamp.pdf b/examples/qtest/overlay-page/stamp.pdf Binary files differnew file mode 100644 index 00000000..a86f4344 --- /dev/null +++ b/examples/qtest/overlay-page/stamp.pdf |