OpenSystemsDevelopment / qpdf

Commit cfa2eb97fb9b38d62fd2cd8d54ab59bac503967f

Authored by Jay Berkenbilt
1 parent d926d780

Add page rotation (fixes #132)

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Showing 9 changed files with 1126 additions and 0 deletions
ChangeLog
  View file @cfa2eb9
1 1 2017-08-12 Jay Berkenbilt <ejb@ql.org>
2 2  
  3 + * Add QPDFObjectHandle::rotatePage to apply rotation to a page
  4 + object. Add --rotate option to qpdf to specify page rotation from
  5 + the command line.
  6 +
3 7 * Provide --verbose option that causes qpdf to print an indication
4 8 of what files it is writing.
5 9  
... ...
include/qpdf/QPDFObjectHandle.hh
  View file @cfa2eb9
... ... @@ -507,6 +507,13 @@ class QPDFObjectHandle
507 507 QPDF_DLL
508 508 void addPageContents(QPDFObjectHandle contents, bool first);
509 509  
  510 + // Rotate a page. If relative is false, set the rotation of the
  511 + // page to angle. Otherwise, add angle to the rotation of the
  512 + // page. Angle must be a multiple of 90. Adding 90 to the rotation
  513 + // rotates clockwise by 90 degrees.
  514 + QPDF_DLL
  515 + void rotatePage(int angle, bool relative);
  516 +
510 517 // Initializers for objects. This Factory class gives the QPDF
511 518 // class specific permission to call factory methods without
512 519 // making it a friend of the whole QPDFObjectHandle class.
... ...
libqpdf/QPDFObjectHandle.cc
  View file @cfa2eb9
... ... @@ -673,6 +673,62 @@ QPDFObjectHandle::addPageContents(QPDFObjectHandle new_contents, bool first)
673 673 this->replaceKey("/Contents", contents);
674 674 }
675 675  
  676 +void
  677 +QPDFObjectHandle::rotatePage(int angle, bool relative)
  678 +{
  679 + assertPageObject();
  680 + if ((angle % 90) != 0)
  681 + {
  682 + throw std::runtime_error(
  683 + "QPDF::rotatePage called with an"
  684 + " angle that is not a multiple of 90");
  685 + }
  686 + int new_angle = angle;
  687 + if (relative)
  688 + {
  689 + int old_angle = 0;
  690 + bool found_rotate = false;
  691 + QPDFObjectHandle cur_obj = *this;
  692 + bool searched_parent = false;
  693 + std::set<QPDFObjGen> visited;
  694 + while (! found_rotate)
  695 + {
  696 + if (visited.count(cur_obj.getObjGen()))
  697 + {
  698 + // Don't get stuck in an infinite loop
  699 + break;
  700 + }
  701 + if (! visited.empty())
  702 + {
  703 + searched_parent = true;
  704 + }
  705 + visited.insert(cur_obj.getObjGen());
  706 + if (cur_obj.getKey("/Rotate").isInteger())
  707 + {
  708 + found_rotate = true;
  709 + old_angle = cur_obj.getKey("/Rotate").getIntValue();
  710 + }
  711 + else if (cur_obj.getKey("/Parent").isDictionary())
  712 + {
  713 + cur_obj = cur_obj.getKey("/Parent");
  714 + }
  715 + else
  716 + {
  717 + break;
  718 + }
  719 + }
  720 + QTC::TC("qpdf", "QPDFObjectHandle found old angle",
  721 + searched_parent ? 0 : 1);
  722 + if ((old_angle % 90) != 0)
  723 + {
  724 + old_angle = 0;
  725 + }
  726 + new_angle += old_angle;
  727 + }
  728 + new_angle = (new_angle + 360) % 360;
  729 + replaceKey("/Rotate", QPDFObjectHandle::newInteger(new_angle));
  730 +}
  731 +
676 732 std::string
677 733 QPDFObjectHandle::unparse()
678 734 {
... ...
manual/qpdf-manual.xml
  View file @cfa2eb9
... ... @@ -349,6 +349,26 @@ make
349 349 </listitem>
350 350 </varlistentry>
351 351 <varlistentry>
  352 + <term><option>--rotate=[+|-]angle:page-range</option></term>
  353 + <listitem>
  354 + <para>
  355 + Apply rotation to specified pages. The
  356 + <option>page-range</option> portion of the option value has
  357 + the same format as page ranges in <xref
  358 + linkend="ref.page-selection"/>. The <option>angle</option>
  359 + portion of the parameter may be either 90, 180, or 270. If
  360 + preceded by <option>+</option> or <option>-</option>, the
  361 + angle is added to or subtracted from the specified pages'
  362 + original rotations. Otherwise the pages' rotations are set to
  363 + the exact value. For example, the command <command>qpdf in.pdf
  364 + out.pdf --rotate=+90:2,4,6 --rotate=180:7-8</command> would
  365 + rotate pages 2, 4, and 6 90 degrees clockwise from their
  366 + original rotation and force the rotation of pages 7 through 9
  367 + to 180 degrees regardless of their original rotation.
  368 + </para>
  369 + </listitem>
  370 + </varlistentry>
  371 + <varlistentry>
352 372 <term><option>--pages options --</option></term>
353 373 <listitem>
354 374 <para>
... ...
qpdf/qpdf.cc
  View file @cfa2eb9
... ... @@ -37,6 +37,18 @@ struct PageSpec
37 37 char const* range;
38 38 };
39 39  
  40 +struct RotationSpec
  41 +{
  42 + RotationSpec(int angle = 0, bool relative = false) :
  43 + angle(angle),
  44 + relative(relative)
  45 + {
  46 + }
  47 +
  48 + int angle;
  49 + bool relative;
  50 +};
  51 +
40 52 struct Options
41 53 {
42 54 Options() :
... ... @@ -151,6 +163,7 @@ struct Options
151 163 bool show_page_images;
152 164 bool check;
153 165 std::vector<PageSpec> page_specs;
  166 + std::map<std::string, RotationSpec> rotations;
154 167 bool require_outfile;
155 168 char const* infilename;
156 169 char const* outfilename;
... ... @@ -209,6 +222,8 @@ Basic Options\n\
209 222 --encrypt options -- generate an encrypted file\n\
210 223 --decrypt remove any encryption on the file\n\
211 224 --pages options -- select specific pages from one or more files\n\
  225 +--rotate=[+|-]angle:page-range\n\
  226 + rotate each specified page 90, 180, or 270 degrees\n\
212 227 --split-pages=[n] write each output page to a separate file\n\
213 228 \n\
214 229 If none of --copy-encryption, --encrypt or --decrypt are given, qpdf will\n\
... ... @@ -219,6 +234,13 @@ parameters will be copied, including both user and owner passwords, even\n\
219 234 if the user password is used to open the other file. This works even if\n\
220 235 the owner password is not known.\n\
221 236 \n\
  237 +The --rotate flag can be used to specify pages to rotate pages either\n\
  238 +90, 180, or 270 degrees. The page range is specified in the same\n\
  239 +format as with the --pages option, described below. Repeat the option\n\
  240 +to rotate multiple groups of pages. If the angle is preceded by + or -,\n\
  241 +it is added to or subtracted from the original rotation. Otherwise, the\n\
  242 +rotation angle is set explicitly to the given value.\n\
  243 +\n\
222 244 If --split-pages is specified, each page is written to a separate output\n\
223 245 file. File names are generated as follows:\n\
224 246 * If the string %d appears in the output file name, it is replaced with a\n\
... ... @@ -1148,6 +1170,62 @@ static void handle_help_verison(int argc, char* argv[])
1148 1170 }
1149 1171 }
1150 1172  
  1173 +static void parse_rotation_parameter(Options& o, std::string const& parameter)
  1174 +{
  1175 + std::string angle_str;
  1176 + std::string range;
  1177 + size_t colon = parameter.find(':');
  1178 + int relative = 0;
  1179 + if (colon != std::string::npos)
  1180 + {
  1181 + if (colon > 0)
  1182 + {
  1183 + angle_str = parameter.substr(0, colon);
  1184 + if (angle_str.length() > 0)
  1185 + {
  1186 + char first = angle_str.at(0);
  1187 + if ((first == '+') || (first == '-'))
  1188 + {
  1189 + relative = ((first == '+') ? 1 : -1);
  1190 + angle_str = angle_str.substr(1);
  1191 + }
  1192 + else if (! QUtil::is_digit(angle_str.at(0)))
  1193 + {
  1194 + angle_str = "";
  1195 + }
  1196 + }
  1197 + }
  1198 + if (colon + 1 < parameter.length())
  1199 + {
  1200 + range = parameter.substr(colon + 1);
  1201 + }
  1202 + }
  1203 + bool range_valid = false;
  1204 + try
  1205 + {
  1206 + parse_numrange(range.c_str(), 0, true);
  1207 + range_valid = true;
  1208 + }
  1209 + catch (std::runtime_error)
  1210 + {
  1211 + // ignore
  1212 + }
  1213 + if (range_valid &&
  1214 + ((angle_str == "90") || (angle_str == "180") || (angle_str == "270")))
  1215 + {
  1216 + int angle = atoi(angle_str.c_str());
  1217 + if (relative == -1)
  1218 + {
  1219 + angle = -angle;
  1220 + }
  1221 + o.rotations[range] = RotationSpec(angle, (relative != 0));
  1222 + }
  1223 + else
  1224 + {
  1225 + usage("invalid parameter to rotate: " + parameter);
  1226 + }
  1227 +}
  1228 +
1151 1229 static void parse_options(int argc, char* argv[], Options& o)
1152 1230 {
1153 1231 for (int i = 1; i < argc; ++i)
... ... @@ -1237,6 +1315,10 @@ static void parse_options(int argc, char* argv[], Options&amp; o)
1237 1315 usage("--pages: no page specifications given");
1238 1316 }
1239 1317 }
  1318 + else if (strcmp(arg, "rotate") == 0)
  1319 + {
  1320 + parse_rotation_parameter(o, parameter);
  1321 + }
1240 1322 else if (strcmp(arg, "stream-data") == 0)
1241 1323 {
1242 1324 if (parameter == 0)
... ... @@ -1829,6 +1911,29 @@ static void handle_page_specs(QPDF&amp; pdf, Options&amp; o,
1829 1911 }
1830 1912 }
1831 1913  
  1914 +static void handle_rotations(QPDF& pdf, Options& o)
  1915 +{
  1916 + std::vector<QPDFObjectHandle> pages = pdf.getAllPages();
  1917 + int npages = static_cast<int>(pages.size());
  1918 + for (std::map<std::string, RotationSpec>::iterator iter =
  1919 + o.rotations.begin();
  1920 + iter != o.rotations.end(); ++iter)
  1921 + {
  1922 + std::string const& range = (*iter).first;
  1923 + RotationSpec const& rspec = (*iter).second;
  1924 + std::vector<int> to_rotate = parse_numrange(range.c_str(), npages);
  1925 + for (std::vector<int>::iterator i2 = to_rotate.begin();
  1926 + i2 != to_rotate.end(); ++i2)
  1927 + {
  1928 + int pageno = *i2 - 1;
  1929 + if ((pageno >= 0) && (pageno < npages))
  1930 + {
  1931 + pages.at(pageno).rotatePage(rspec.angle, rspec.relative);
  1932 + }
  1933 + }
  1934 + }
  1935 +}
  1936 +
1832 1937 static void set_encryption_options(QPDF& pdf, Options& o, QPDFWriter& w)
1833 1938 {
1834 1939 int R = 0;
... ... @@ -2124,6 +2229,10 @@ int main(int argc, char* argv[])
2124 2229 {
2125 2230 handle_page_specs(pdf, o, page_heap);
2126 2231 }
  2232 + if (! o.rotations.empty())
  2233 + {
  2234 + handle_rotations(pdf, o);
  2235 + }
2127 2236  
2128 2237 if (o.outfilename == 0)
2129 2238 {
... ...
qpdf/qpdf.testcov
  View file @cfa2eb9
... ... @@ -295,3 +295,4 @@ QPDF ignore second extra space in xref entry 0
295 295 QPDF ignore length error xref entry 0
296 296 QPDF_encryption pad short parameter 0
297 297 QPDFWriter ignore self-referential object stream 0
  298 +QPDFObjectHandle found old angle 1
... ...
qpdf/qtest/qpdf.test
  View file @cfa2eb9
... ... @@ -780,6 +780,26 @@ foreach my $d (@sp_cases)
780 780  
781 781 show_ntests();
782 782 # ----------
  783 +$td->notify("--- Rotate Pages ---");
  784 +$n_tests += 2;
  785 +# XXX do absolute, positive, and negative on ranges that include
  786 +# inherited and non-inherited.
  787 +# Pages 11-15 inherit /Rotate 90
  788 +# Pages 1 and 2 have explicit /Rotate 270
  789 +# Pages 16 and 17 have explicit /Rotate 180
  790 +
  791 +$td->runtest("page rotation",
  792 + {$td->COMMAND => "qpdf --static-id to-rotate.pdf a.pdf" .
  793 + " --rotate=+90:1,4,11,16" .
  794 + " --rotate=180:2,5,12-13" .
  795 + " --rotate=-90:3,15,17,18"},
  796 + {$td->STRING => "", $td->EXIT_STATUS => 0});
  797 +$td->runtest("check output",
  798 + {$td->FILE => "a.pdf"},
  799 + {$td->FILE => "rotated.pdf"});
  800 +
  801 +show_ntests();
  802 +# ----------
783 803 $td->notify("--- Numeric range parsing tests ---");
784 804 my @nrange_tests = (
785 805 [",5",
... ...
qpdf/qtest/qpdf/rotated.pdf 0 → 100644
View file @cfa2eb9
No preview for this file type
qpdf/qtest/qpdf/to-rotate.pdf 0 → 100644
  View file @cfa2eb9
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