OpenSystemsDevelopment / qpdf

Commit 4f3b89991be466b77d1be2ab4fe0dc3f9228a17e

Authored by Jay Berkenbilt
1 parent b76b73b2

placeFormXObject: allow control of shrink/expand (fixes #409)

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Showing 11 changed files with 2016 additions and 17 deletions
ChangeLog
  View file @4f3b899
  1 +2020-04-03 Jay Berkenbilt <ejb@ql.org>
  2 +
  3 + * Add two extra optional arguments to
  4 + QPDFPageObjectHelper::placeFormXObject to control whether the
  5 + placed item is allowed to be shrunk or expanded to fit within or
  6 + maximally fill the destination rectangle. Prior to this change,
  7 + placeFormXObject might shrink it but would never expand it.
  8 +
1 9 2020-04-02 Jay Berkenbilt <ejb@ql.org>
2 10  
3 11 * Add method QPDFObjectHandle::unsafeShallowCopy for copying only
... ...
include/qpdf/QPDFPageObjectHelper.hh
  View file @4f3b899
... ... @@ -209,27 +209,33 @@ class QPDFPageObjectHelper: public QPDFObjectHelper
209 209  
210 210 // Return content stream text that will place the given form
211 211 // XObject (fo) using the resource name "name" on this page
212   - // centered within the given rectangle and shrunk to fit if
213   - // necessary. If invert_transformations is true, the effect of any
214   - // rotation (/Rotate) and scaling (/UserUnit) applied to the
215   - // current page will be inverted in the form XObject placement.
216   - // This will cause the form XObject's absolute orientation to be
217   - // preserved. You could overlay one page on another by calling
218   - // getFormXObjectForPage on the original page,
219   - // QPDFObjectHandle::getUniqueResourceName on the destination
220   - // page's Resources dictionary to generate a name for the
221   - // resulting object, and calling placeFormXObject on the
  212 + // centered within the given rectangle. If invert_transformations
  213 + // is true, the effect of any rotation (/Rotate) and scaling
  214 + // (/UserUnit) applied to the current page will be inverted in the
  215 + // form XObject placement. This will cause the form XObject's
  216 + // absolute orientation to be preserved. You could overlay one
  217 + // page on another by calling getFormXObjectForPage on the
  218 + // original page, QPDFObjectHandle::getUniqueResourceName on the
  219 + // destination page's Resources dictionary to generate a name for
  220 + // the resulting object, and calling placeFormXObject on the
222 221 // destination page. Then insert the new fo (or, if it comes from
223 222 // a different file, the result of calling copyForeignObject on
224 223 // it) into the resources dictionary using name, and append or
225 224 // prepend the content to the page's content streams. See the
226 225 // overlay/underlay code in qpdf.cc or
227   - // examples/pdf-overlay-page.cc for an example.
  226 + // examples/pdf-overlay-page.cc for an example. From qpdf 10.0.0,
  227 + // the allow_shrink and allow_expand parameters control whether
  228 + // the form XObject is allowed to be shrunk or expanded to stay
  229 + // within or maximally fill the destination rectangle. The default
  230 + // values are for backward compatibility with the pre-10.0.0
  231 + // behavior.
228 232 QPDF_DLL
229 233 std::string placeFormXObject(
230 234 QPDFObjectHandle fo, std::string const& name,
231 235 QPDFObjectHandle::Rectangle rect,
232   - bool invert_transformations = true);
  236 + bool invert_transformations = true,
  237 + bool allow_shrink = true,
  238 + bool allow_expand = false);
233 239  
234 240 private:
235 241 static void
... ...
libqpdf/QPDFPageObjectHelper.cc
  View file @4f3b899
... ... @@ -724,11 +724,12 @@ std::string
724 724 QPDFPageObjectHelper::placeFormXObject(
725 725 QPDFObjectHandle fo, std::string const& name,
726 726 QPDFObjectHandle::Rectangle rect,
727   - bool invert_transformations)
  727 + bool invert_transformations,
  728 + bool allow_shrink, bool allow_expand)
728 729 {
729 730 // Calculate the transformation matrix that will place the given
730   - // form XObject fully inside the given rectangle, shrinking and
731   - // centering if needed.
  731 + // form XObject fully inside the given rectangle, center and
  732 + // shrinking or expanding as needed if requested.
732 733  
733 734 // When rendering a form XObject, the transformation in the
734 735 // graphics state (cm) is applied first (of course -- when it is
... ... @@ -797,7 +798,17 @@ QPDFPageObjectHelper::placeFormXObject(
797 798 double scale = (xscale < yscale ? xscale : yscale);
798 799 if (scale > 1.0)
799 800 {
800   - scale = 1.0;
  801 + if (! allow_expand)
  802 + {
  803 + scale = 1.0;
  804 + }
  805 + }
  806 + else if (scale < 1.0)
  807 + {
  808 + if (! allow_shrink)
  809 + {
  810 + scale = 1.0;
  811 + }
801 812 }
802 813  
803 814 // Step 2: figure out what translation is required to get the
... ...
qpdf/qtest/qpdf.test
  View file @4f3b899
... ... @@ -412,7 +412,7 @@ foreach my $i (@choice_values)
412 412 show_ntests();
413 413 # ----------
414 414 $td->notify("--- Form XObject, underlay, overlay ---");
415   -$n_tests += 10;
  415 +$n_tests += 18;
416 416  
417 417 $td->runtest("form xobject creation",
418 418 {$td->COMMAND => "test_driver 55 fxo-red.pdf"},
... ... @@ -433,6 +433,19 @@ foreach (my $i = 56; $i &lt;= 59; ++$i)
433 433 {$td->FILE => "a.pdf"},
434 434 {$td->FILE => "fx-overlay-$i.pdf"});
435 435 }
  436 +foreach (my $i = 64; $i <= 67; ++$i)
  437 +{
  438 + # See comments in test_driver.cc for a verbal description of what
  439 + # the resulting files should look like.
  440 + $td->runtest("overlay shrink/expand",
  441 + {$td->COMMAND =>
  442 + "test_driver $i fxo-bigsmall.pdf fxo-smallbig.pdf"},
  443 + {$td->STRING => "test $i done\n", $td->EXIT_STATUS => 0},
  444 + $td->NORMALIZE_NEWLINES);
  445 + $td->runtest("compare files",
  446 + {$td->FILE => "a.pdf"},
  447 + {$td->FILE => "fx-overlay-$i.pdf"});
  448 +}
436 449  
437 450 my @uo_cases = (
438 451 '--underlay fxo-green.pdf --repeat=z --to=1-14 --' .
... ...
qpdf/qtest/qpdf/fx-overlay-64.pdf 0 → 100644
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  161 +0000000481 00000 n
  162 +0000000725 00000 n
  163 +0000000881 00000 n
  164 +0000000928 00000 n
  165 +0000001073 00000 n
  166 +0000001158 00000 n
  167 +0000001317 00000 n
  168 +0000001366 00000 n
  169 +0000001513 00000 n
  170 +trailer <<
  171 + /Root 1 0 R
  172 + /Size 13
  173 + /ID [<4866f3ccc81fb28dc4a27f0f976ce937><5b260ad1f0f4ccd7895374e61eff0d55>]
  174 +>>
  175 +startxref
  176 +1549
  177 +%%EOF
... ...
qpdf/qtest/qpdf/fxo-smallbig.pdf 0 → 100644
  View file @4f3b899
  1 +%PDF-1.3
  2 +%¿÷¢þ
  3 +%QDF-1.0
  4 +
  5 +%% Original object ID: 1 0
  6 +1 0 obj
  7 +<<
  8 + /Pages 2 0 R
  9 + /Type /Catalog
  10 +>>
  11 +endobj
  12 +
  13 +%% Original object ID: 2 0
  14 +2 0 obj
  15 +<<
  16 + /Count 2
  17 + /Kids [
  18 + 3 0 R
  19 + 4 0 R
  20 + ]
  21 + /Type /Pages
  22 +>>
  23 +endobj
  24 +
  25 +%% Page 1
  26 +%% Original object ID: 3 0
  27 +3 0 obj
  28 +<<
  29 + /Contents 5 0 R
  30 + /MediaBox [
  31 + 0
  32 + 0
  33 + 306
  34 + 396
  35 + ]
  36 + /Parent 2 0 R
  37 + /Resources <<
  38 + /Font <<
  39 + /F1 7 0 R
  40 + >>
  41 + /ProcSet 8 0 R
  42 + >>
  43 + /Type /Page
  44 +>>
  45 +endobj
  46 +
  47 +%% Page 2
  48 +%% Original object ID: 8 0
  49 +4 0 obj
  50 +<<
  51 + /Contents 9 0 R
  52 + /MediaBox [
  53 + 0
  54 + 0
  55 + 612
  56 + 792
  57 + ]
  58 + /Parent 2 0 R
  59 + /Resources <<
  60 + /Font <<
  61 + /F1 11 0 R
  62 + >>
  63 + /ProcSet 12 0 R
  64 + >>
  65 + /Type /Page
  66 +>>
  67 +endobj
  68 +
  69 +%% Contents for page 1
  70 +%% Original object ID: 4 0
  71 +5 0 obj
  72 +<<
  73 + /Length 6 0 R
  74 +>>
  75 +stream
  76 +.5 0 .5 RG
  77 +.5 0 .5 rg
  78 +BT
  79 + /F1 24 Tf
  80 + 36 345 Td
  81 + (small) Tj
  82 +ET
  83 +5 w
  84 +0 0 306 396 re s
  85 +153 198 30 30 re f
  86 +endstream
  87 +endobj
  88 +
  89 +6 0 obj
  90 +105
  91 +endobj
  92 +
  93 +%% Original object ID: 6 0
  94 +7 0 obj
  95 +<<
  96 + /BaseFont /Helvetica
  97 + /Encoding /WinAnsiEncoding
  98 + /Name /F1
  99 + /Subtype /Type1
  100 + /Type /Font
  101 +>>
  102 +endobj
  103 +
  104 +%% Original object ID: 7 0
  105 +8 0 obj
  106 +[
  107 + /PDF
  108 + /Text
  109 +]
  110 +endobj
  111 +
  112 +%% Contents for page 2
  113 +%% Original object ID: 9 0
  114 +9 0 obj
  115 +<<
  116 + /Length 10 0 R
  117 +>>
  118 +stream
  119 +.5 0 .5 RG
  120 +.5 0 .5 rg
  121 +BT
  122 + /F1 24 Tf
  123 + 72 690 Td
  124 + (big) Tj
  125 +ET
  126 +5 w
  127 +0 0 612 792 re s
  128 +246 396 60 60 re f
  129 +endstream
  130 +endobj
  131 +
  132 +10 0 obj
  133 +103
  134 +endobj
  135 +
  136 +%% Original object ID: 11 0
  137 +11 0 obj
  138 +<<
  139 + /BaseFont /Helvetica
  140 + /Encoding /WinAnsiEncoding
  141 + /Name /F1
  142 + /Subtype /Type1
  143 + /Type /Font
  144 +>>
  145 +endobj
  146 +
  147 +%% Original object ID: 12 0
  148 +12 0 obj
  149 +[
  150 + /PDF
  151 + /Text
  152 +]
  153 +endobj
  154 +
  155 +xref
  156 +0 13
  157 +0000000000 65535 f
  158 +0000000052 00000 n
  159 +0000000133 00000 n
  160 +0000000252 00000 n
  161 +0000000481 00000 n
  162 +0000000725 00000 n
  163 +0000000885 00000 n
  164 +0000000932 00000 n
  165 +0000001077 00000 n
  166 +0000001162 00000 n
  167 +0000001321 00000 n
  168 +0000001370 00000 n
  169 +0000001517 00000 n
  170 +trailer <<
  171 + /Root 1 0 R
  172 + /Size 13
  173 + /ID [<4866f3ccc81fb28dc4a27f0f976ce937><7ac42e786a05e6c1a5adfc1c1f33e15c>]
  174 +>>
  175 +startxref
  176 +1553
  177 +%%EOF
... ...
qpdf/test_driver.cc
  View file @4f3b899
... ... @@ -2116,6 +2116,57 @@ void runtest(int n, char const* filename1, char const* arg2)
2116 2116 w.setOutputFilename("a.pdf");
2117 2117 w.write();
2118 2118 }
  2119 + else if ((n >= 64) && (n <= 67))
  2120 + {
  2121 + // Placing form XObjects: expand, shrink
  2122 + assert(arg2);
  2123 + QPDF pdf2;
  2124 + pdf2.processFile(arg2);
  2125 +
  2126 + // Overlay file2 on file1.
  2127 + // 64: allow neither shrink nor shrink
  2128 + // 65: allow shrink but not expand
  2129 + // 66: allow expand but not shrink
  2130 + // 67: allow both shrink and expand
  2131 + bool allow_shrink = ((n == 65) || (n == 67));
  2132 + bool allow_expand = ((n == 66) || (n == 67));
  2133 + std::vector<QPDFPageObjectHelper> pages1 =
  2134 + QPDFPageDocumentHelper(pdf).getAllPages();
  2135 + std::vector<QPDFPageObjectHelper> pages2 =
  2136 + QPDFPageDocumentHelper(pdf2).getAllPages();
  2137 + size_t npages = (pages1.size() < pages2.size()
  2138 + ? pages1.size() : pages2.size());
  2139 + for (size_t i = 0; i < npages; ++i)
  2140 + {
  2141 + QPDFPageObjectHelper& ph1 = pages1.at(i);
  2142 + QPDFPageObjectHelper& ph2 = pages2.at(i);
  2143 + QPDFObjectHandle fo = pdf.copyForeignObject(
  2144 + ph2.getFormXObjectForPage());
  2145 + int min_suffix = 1;
  2146 + QPDFObjectHandle resources = ph1.getAttribute("/Resources", true);
  2147 + std::string name = resources.getUniqueResourceName(
  2148 + "/Fx", min_suffix);
  2149 + std::string content =
  2150 + ph1.placeFormXObject(
  2151 + fo, name, ph1.getTrimBox().getArrayAsRectangle(),
  2152 + false, allow_shrink, allow_expand);
  2153 + if (! content.empty())
  2154 + {
  2155 + resources.mergeResources(
  2156 + QPDFObjectHandle::parse("<< /XObject << >> >>"));
  2157 + resources.getKey("/XObject").replaceKey(name, fo);
  2158 + ph1.addPageContents(
  2159 + QPDFObjectHandle::newStream(&pdf, "q\n"), true);
  2160 + ph1.addPageContents(
  2161 + QPDFObjectHandle::newStream(&pdf, "\nQ\n" + content),
  2162 + false);
  2163 + }
  2164 + }
  2165 + QPDFWriter w(pdf, "a.pdf");
  2166 + w.setQDFMode(true);
  2167 + w.setStaticID(true);
  2168 + w.write();
  2169 + }
2119 2170 else
2120 2171 {
2121 2172 throw std::runtime_error(std::string("invalid test ") +
... ...