diff options
| -rw-r--r-- | ChangeLog | 11 | ||||
| -rw-r--r-- | TODO | 4 | ||||
| -rw-r--r-- | include/qpdf/QPDFPageObjectHelper.hh | 10 | ||||
| -rw-r--r-- | libqpdf/QPDFPageObjectHelper.cc | 132 | ||||
| -rw-r--r-- | manual/qpdf-manual.xml | 13 | ||||
| -rw-r--r-- | qpdf/qpdf.cc | 18 | ||||
| -rw-r--r-- | qpdf/qtest/qpdf.test | 11 | ||||
| -rw-r--r-- | qpdf/qtest/qpdf/boxes-flattened.pdf | 907 | ||||
| -rw-r--r-- | qpdf/qtest/qpdf/boxes.pdf | 685 |
9 files changed, 1786 insertions, 5 deletions
@@ -1,3 +1,14 @@ +2020-12-30 Jay Berkenbilt <ejb@ql.org> + + * Add QPDFPageObjectHelper::flattenRotation and --flatten-rotation + option to the qpdf CLI. The flattenRotation method removes any + /Rotate key from a page dictionary and implements the same + rotation by modifying the page's contents such that the various + page boxes are altered and the page renders identically. This can + be used to work around buggy PDF applications that don't properly + handle page rotation. The --flatten-rotation option to the qpdf + CLI calls flattenRotation for every page. + 2020-12-26 Jay Berkenbilt <ejb@ql.org> * Add QPDFObjectHandle::setFilterOnWrite, which can be used to @@ -39,10 +39,6 @@ Candidates for upcoming release * big page even with --remove-unreferenced-resources=yes, even with --empty * optimize image failure because of colorspace -* Take flattenRotation code from pdf-split and do something with it, - maybe adding it to the library. Once there, call it from pdf-split - and bump up the required version of qpdf. - * Externalize inline images doesn't walk into form XObjects. In general: diff --git a/include/qpdf/QPDFPageObjectHelper.hh b/include/qpdf/QPDFPageObjectHelper.hh index a197ece7..42d67088 100644 --- a/include/qpdf/QPDFPageObjectHelper.hh +++ b/include/qpdf/QPDFPageObjectHelper.hh @@ -242,6 +242,16 @@ class QPDFPageObjectHelper: public QPDFObjectHelper bool allow_shrink = true, bool allow_expand = false); + // If a page is rotated using /Rotate in the page's dictionary, + // instead rotate the page by the same amount by altering the + // contents and removing the /Rotate key. This method adjusts the + // various page bounding boxes (/MediaBox, etc.) so that the page + // will have the same semantics. This can be useful to work around + // problems with PDF applications that can't properly handle + // rotated pages. + QPDF_DLL + void flattenRotation(); + private: static void removeUnreferencedResourcesHelper( diff --git a/libqpdf/QPDFPageObjectHelper.cc b/libqpdf/QPDFPageObjectHelper.cc index b7da816e..58747814 100644 --- a/libqpdf/QPDFPageObjectHelper.cc +++ b/libqpdf/QPDFPageObjectHelper.cc @@ -835,3 +835,135 @@ QPDFPageObjectHelper::placeFormXObject( name + " Do\n" + "Q\n"); } + +void +QPDFPageObjectHelper::flattenRotation() +{ + QPDF* qpdf = this->oh.getOwningQPDF(); + if (! qpdf) + { + throw std::runtime_error( + "QPDFPageObjectHelper::flattenRotation" + " called with a direct object"); + } + + auto rotate_oh = this->oh.getKey("/Rotate"); + int rotate = 0; + if (rotate_oh.isInteger()) + { + rotate = rotate_oh.getIntValueAsInt(); + } + if (! ((rotate == 90) || (rotate == 180) || (rotate == 270))) + { + return; + } + auto mediabox = this->oh.getKey("/MediaBox"); + if (! mediabox.isRectangle()) + { + return; + } + auto media_rect = mediabox.getArrayAsRectangle(); + + std::vector<std::string> boxes = { + "/MediaBox", "/CropBox", "/BleedBox", "/TrimBox", "/ArtBox", + }; + for (auto const& boxkey: boxes) + { + auto box = this->oh.getKey(boxkey); + if (! box.isRectangle()) + { + continue; + } + auto rect = box.getArrayAsRectangle(); + decltype(rect) new_rect; + + // How far are the edges of our rectangle from the edges + // of the media box? + auto left_x = rect.llx - media_rect.llx; + auto right_x = media_rect.urx - rect.urx; + auto bottom_y = rect.lly - media_rect.lly; + auto top_y = media_rect.ury - rect.ury; + + // Rotating the page 180 degrees does not change + // /MediaBox. Rotating 90 or 270 degrees reverses llx and + // lly and also reverse urx and ury. For all the other + // boxes, we want the corners to be the correct distance + // away from the corners of the mediabox. + switch (rotate) + { + case 90: + new_rect.llx = media_rect.lly + bottom_y; + new_rect.urx = media_rect.ury - top_y; + new_rect.lly = media_rect.llx + right_x; + new_rect.ury = media_rect.urx - left_x; + break; + + case 180: + new_rect.llx = media_rect.llx + right_x; + new_rect.urx = media_rect.urx - left_x; + new_rect.lly = media_rect.lly + top_y; + new_rect.ury = media_rect.ury - bottom_y; + break; + + case 270: + new_rect.llx = media_rect.lly + top_y; + new_rect.urx = media_rect.ury - bottom_y; + new_rect.lly = media_rect.llx + left_x; + new_rect.ury = media_rect.urx - right_x; + break; + + default: + // ignore + break; + } + + this->oh.replaceKey( + boxkey, QPDFObjectHandle::newFromRectangle(new_rect)); + } + + // When we rotate the page, pivot about the point 0, 0 and then + // translate so the page is visible with the origin point being + // the same offset from the lower left corner of the media box. + // These calculations have been verified emperically with various + // PDF readers. + QPDFObjectHandle::Matrix cm; + cm.e = 0.0; + cm.f = 0.0; + switch (rotate) + { + case 90: + cm.b = -1; + cm.c = 1; + cm.f = media_rect.urx + media_rect.llx; + break; + + case 180: + cm.a = -1; + cm.d = -1; + cm.e = media_rect.urx + media_rect.llx; + cm.f = media_rect.ury + media_rect.lly; + break; + + case 270: + cm.b = 1; + cm.c = -1; + cm.e = media_rect.ury + media_rect.lly; + break; + + default: + break; + } + std::string cm_str = + std::string("q\n") + + QUtil::double_to_string(cm.a, 2) + " " + + QUtil::double_to_string(cm.b, 2) + " " + + QUtil::double_to_string(cm.c, 2) + " " + + QUtil::double_to_string(cm.d, 2) + " " + + QUtil::double_to_string(cm.e, 2) + " " + + QUtil::double_to_string(cm.f, 2) + " cm\n"; + this->oh.addPageContents( + QPDFObjectHandle::newStream(qpdf, cm_str), true); + this->oh.addPageContents( + QPDFObjectHandle::newStream(qpdf, "\nQ\n"), false); + this->oh.removeKey("/Rotate"); +} diff --git a/manual/qpdf-manual.xml b/manual/qpdf-manual.xml index 10a165d3..8caab104 100644 --- a/manual/qpdf-manual.xml +++ b/manual/qpdf-manual.xml @@ -1063,6 +1063,19 @@ make </listitem> </varlistentry> <varlistentry> + <term><option>--flatten-rotation</option></term> + <listitem> + <para> + For each page that is rotated using the + <literal>/Rotate</literal> key in the page's dictionary, + remove the <literal>/Rotate</literal> key and implement the + identical rotation semantics by modifying the page's contents. + This option can be useful to prepare files for buggy PDF + applications that don't properly handle rotated pages. + </para> + </listitem> + </varlistentry> + <varlistentry> <term><option>--split-pages=[n]</option></term> <listitem> <para> diff --git a/qpdf/qpdf.cc b/qpdf/qpdf.cc index 83670596..19d7b0c4 100644 --- a/qpdf/qpdf.cc +++ b/qpdf/qpdf.cc @@ -174,6 +174,7 @@ struct Options show_pages(false), show_page_images(false), collate(false), + flatten_rotation(false), json(false), check(false), optimize_images(false), @@ -276,6 +277,7 @@ struct Options bool show_pages; bool show_page_images; bool collate; + bool flatten_rotation; bool json; std::set<std::string> json_keys; std::set<std::string> json_objects; @@ -747,6 +749,7 @@ class ArgParser void argOverlay(); void argRotate(char* parameter); void argCollate(); + void argFlattenRotation(); void argStreamData(char* parameter); void argCompressStreams(char* parameter); void argRecompressFlate(); @@ -968,6 +971,7 @@ ArgParser::initOptionTable() char const* stream_data_choices[] = {"compress", "preserve", "uncompress", 0}; (*t)["collate"] = oe_bare(&ArgParser::argCollate); + (*t)["flatten-rotation"] = oe_bare(&ArgParser::argFlattenRotation); (*t)["stream-data"] = oe_requiredChoices( &ArgParser::argStreamData, stream_data_choices); (*t)["compress-streams"] = oe_requiredChoices( @@ -1250,6 +1254,7 @@ ArgParser::argHelp() << "--pages options -- select specific pages from one or more files\n" << "--collate causes files specified in --pages to be collated\n" << " rather than concatenated\n" + << "--flatten-rotation move page rotation from /Rotate key to content\n" << "--rotate=[+|-]angle[:page-range]\n" << " rotate each specified page 90, 180, or 270 degrees;\n" << " rotate all pages if no page range is given\n" @@ -1880,6 +1885,12 @@ ArgParser::argRotate(char* parameter) } void +ArgParser::argFlattenRotation() +{ + o.flatten_rotation = true; +} + +void ArgParser::argStreamData(char* parameter) { o.stream_data_set = true; @@ -4818,6 +4829,13 @@ static void handle_transformations(QPDF& pdf, Options& o) (*iter).coalesceContentStreams(); } } + if (o.flatten_rotation) + { + for (auto& page: dh.getAllPages()) + { + page.flattenRotation(); + } + } if (o.remove_page_labels) { pdf.getRoot().removeKey("/PageLabels"); diff --git a/qpdf/qtest/qpdf.test b/qpdf/qtest/qpdf.test index b166db84..1fdc5f09 100644 --- a/qpdf/qtest/qpdf.test +++ b/qpdf/qtest/qpdf.test @@ -671,7 +671,7 @@ foreach my $d (@json_files) show_ntests(); # ---------- $td->notify("--- Page API Tests ---"); -$n_tests += 9; +$n_tests += 11; $td->runtest("basic page API", {$td->COMMAND => "test_driver 15 page_api_1.pdf"}, @@ -706,6 +706,15 @@ $td->runtest("remove page we don't have", {$td->COMMAND => "test_driver 22 page_api_1.pdf"}, {$td->FILE => "page_api_1.out2", $td->EXIT_STATUS => 2}, $td->NORMALIZE_NEWLINES); +$td->runtest("flatten rotation", + {$td->COMMAND => "qpdf --static-id --qdf". + " --no-original-object-ids" . + " --flatten-rotation boxes.pdf a.pdf"}, + {$td->STRING => "", $td->EXIT_STATUS => 0}, + $td->NORMALIZE_NEWLINES); +$td->runtest("check output", + {$td->FILE => "a.pdf"}, + {$td->FILE => "boxes-flattened.pdf"}); show_ntests(); # ---------- $td->notify("--- Files for specific bugs ---"); diff --git a/qpdf/qtest/qpdf/boxes-flattened.pdf b/qpdf/qtest/qpdf/boxes-flattened.pdf new file mode 100644 index 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