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mirror of https://github.com/qpdf/qpdf.git synced 2024-12-22 10:58:58 +00:00

Add QPDFPageObjectHelper::flattenRotation and --flatten-rotation

This commit is contained in:
Jay Berkenbilt 2020-12-30 12:51:04 -05:00
parent 78c49824eb
commit c9271335fa
9 changed files with 1786 additions and 5 deletions

View File

@ -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

4
TODO
View File

@ -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:

View File

@ -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(

View File

@ -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");
}

View File

@ -1062,6 +1062,19 @@ make
</para>
</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>

View File

@ -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"
@ -1879,6 +1884,12 @@ ArgParser::argRotate(char* parameter)
parseRotationParameter(parameter);
}
void
ArgParser::argFlattenRotation()
{
o.flatten_rotation = true;
}
void
ArgParser::argStreamData(char* parameter)
{
@ -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");

View File

@ -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 ---");

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685
qpdf/qtest/qpdf/boxes.pdf Normal file
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