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Annotation flattening including form fields

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Flatten annotations by integrating their appearance streams into the
content stream of the containing page. In the case of form fields,
only flatten if /NeedAppearance is false (or equivalently absent). If
flattening form fields, also remove /AcroForm from the document
catalog.
This commit is contained in:
Jay Berkenbilt 2018-12-31 23:08:57 -05:00
parent 95d6b17a89
commit 3b8ce4f12a
20 changed files with 19540 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
ChangeLog
View File

@ -1,5 +1,22 @@
2018-12-31 Jay Berkenbilt <ejb@ql.org>
* Add several methods for flattening form fields and annotations:
- QPDFPageDocumentHelper::flattenAnnotations - integrate
annotation appearance streams into page contents with special
handling for form fields: if appearance streams are up to date
(/NeedAppearances is false in /AcroForm), the /AcroForm key of
the document catalog is removed. Otherwise, a warning is
issued, and form fields are ignored. Non-form-field
annotations are always flattened if an appearance stream can
be found.
- QPDFAnnotationObjectHelper::getPageContentForAppearance -
generate the content stream fragment to render an appearance
stream in a page's content stream. Called by flattenAnnotations.
- QPDFAnnotationObjectHelper::getAnnotationAppearanceMatrix -
calculate the matrix that will transform from the appearance
stream coordinates to the page coordinates. Called by
getPageContentForAppearance.
* Add method QPDFObjectHandle::mergeDictionary(), which
recursively merges dictionaries with semantics designed for
merging resource dictionaries. See detailed description in

16
include/qpdf/QPDFPageDocumentHelper.hh
View File

@ -31,6 +31,8 @@
#include <qpdf/QPDF.hh>
class QPDFAcroFormDocumentHelper;
class QPDFPageDocumentHelper: public QPDFDocumentHelper
{
public:
@ -84,7 +86,21 @@ class QPDFPageDocumentHelper: public QPDFDocumentHelper
QPDF_DLL
void removePage(QPDFPageObjectHelper page);
// For every annotation, integrate the annotation's appearance
// stream into the containing page's content streams, merge the
// annotation's resources with the page's resources, and remove
// the annotation from the page. Handles widget annotations
// associated with interactive form fields as a special case,
// including removing the /AcroForm key from the document catalog.
QPDF_DLL
void flattenAnnotations();
private:
void flattenAnnotationsForPage(
QPDFPageObjectHelper& page,
QPDFObjectHandle& resources,
QPDFAcroFormDocumentHelper& afdh);
class Members
{
friend class QPDFPageDocumentHelper;

10
libqpdf/QPDFAnnotationObjectHelper.cc
View File

@ -149,12 +149,12 @@ QPDFAnnotationObjectHelper::getAnnotationAppearanceMatrix(int rotate)
QPDFMatrix matrix;
if (matrix_obj.isMatrix())
{
/// QTC::TC("qpdf", "QPDFAnnotationObjectHelper explicit matrix");
QTC::TC("qpdf", "QPDFAnnotationObjectHelper explicit matrix");
matrix = QPDFMatrix(matrix_obj.getArrayAsMatrix());
}
else
{
/// QTC::TC("qpdf", "QPDFAnnotationObjectHelper default matrix");
QTC::TC("qpdf", "QPDFAnnotationObjectHelper default matrix");
}
QPDFObjectHandle::Rectangle rect = rect_obj.getArrayAsRectangle();
if (rotate && flags.isInteger() && (flags.getIntValue() & 16))
@ -176,7 +176,7 @@ QPDFAnnotationObjectHelper::getAnnotationAppearanceMatrix(int rotate)
switch (rotate)
{
case 90:
/// QTC::TC("qpdf", "QPDFAnnotationObjectHelper rotate 90");
QTC::TC("qpdf", "QPDFAnnotationObjectHelper rotate 90");
rect = QPDFObjectHandle::Rectangle(
rect.llx,
rect.ury,
@ -184,7 +184,7 @@ QPDFAnnotationObjectHelper::getAnnotationAppearanceMatrix(int rotate)
rect.ury + rect_w);
break;
case 180:
/// QTC::TC("qpdf", "QPDFAnnotationObjectHelper rotate 180");
QTC::TC("qpdf", "QPDFAnnotationObjectHelper rotate 180");
rect = QPDFObjectHandle::Rectangle(
rect.llx - rect_w,
rect.ury,
@ -192,7 +192,7 @@ QPDFAnnotationObjectHelper::getAnnotationAppearanceMatrix(int rotate)
rect.ury + rect_h);
break;
case 270:
/// QTC::TC("qpdf", "QPDFAnnotationObjectHelper rotate 270");
QTC::TC("qpdf", "QPDFAnnotationObjectHelper rotate 270");
rect = QPDFObjectHandle::Rectangle(
rect.llx - rect_h,
rect.ury - rect_w,

127
libqpdf/QPDFPageDocumentHelper.cc
View File

@ -1,4 +1,6 @@
#include <qpdf/QPDFPageDocumentHelper.hh>
#include <qpdf/QPDFAcroFormDocumentHelper.hh>
#include <qpdf/QTC.hh>
QPDFPageDocumentHelper::Members::~Members()
{
@ -62,3 +64,128 @@ QPDFPageDocumentHelper::removePage(QPDFPageObjectHelper page)
{
this->qpdf.removePage(page.getObjectHandle());
}
void
QPDFPageDocumentHelper::flattenAnnotations()
{
QPDFAcroFormDocumentHelper afdh(this->qpdf);
if (afdh.getNeedAppearances())
{
this->qpdf.getRoot().getKey("/AcroForm").warnIfPossible(
"document does not have updated appearance streams,"
" so form fields will not be flattened");
}
pushInheritedAttributesToPage();
std::vector<QPDFPageObjectHelper> pages = getAllPages();
for (std::vector<QPDFPageObjectHelper>::iterator iter = pages.begin();
iter != pages.end(); ++iter)
{
QPDFPageObjectHelper ph(*iter);
QPDFObjectHandle page_oh = ph.getObjectHandle();
if (page_oh.getKey("/Resources").isIndirect())
{
QTC::TC("qpdf", "QPDFPageDocumentHelper indirect resources");
page_oh.replaceKey("/Resources",
page_oh.getKey("/Resources").shallowCopy());
}
QPDFObjectHandle resources = ph.getObjectHandle().getKey("/Resources");
if (! resources.isDictionary())
{
// This should never happen and is not exercised in the
// test suite
resources = QPDFObjectHandle::newDictionary();
}
flattenAnnotationsForPage(ph, resources, afdh);
}
if (! afdh.getNeedAppearances())
{
this->qpdf.getRoot().removeKey("/AcroForm");
}
}
void
QPDFPageDocumentHelper::flattenAnnotationsForPage(
QPDFPageObjectHelper& page,
QPDFObjectHandle& resources,
QPDFAcroFormDocumentHelper& afdh)
{
bool need_appearances = afdh.getNeedAppearances();
std::vector<QPDFAnnotationObjectHelper> annots = page.getAnnotations();
std::vector<QPDFObjectHandle> new_annots;
std::string new_content;
int rotate = 0;
QPDFObjectHandle rotate_obj =
page.getObjectHandle().getKey("/Rotate");
if (rotate_obj.isInteger() && rotate_obj.getIntValue())
{
rotate = rotate_obj.getIntValue();
}
for (std::vector<QPDFAnnotationObjectHelper>::iterator iter =
annots.begin();
iter != annots.end(); ++iter)
{
QPDFAnnotationObjectHelper& aoh(*iter);
QPDFObjectHandle as = aoh.getAppearanceStream("/N");
bool is_widget = (aoh.getSubtype() == "/Widget");
bool process = true;
if (need_appearances && is_widget)
{
QTC::TC("qpdf", "QPDFPageDocumentHelper skip widget need appearances");
process = false;
}
if (process && (! as.isStream()))
{
process = false;
}
if (process)
{
resources.mergeDictionary(as.getDict().getKey("/Resources"));
if (is_widget)
{
QTC::TC("qpdf", "QPDFPageDocumentHelper merge DR");
QPDFFormFieldObjectHelper ff = afdh.getFieldForAnnotation(aoh);
resources.mergeDictionary(ff.getInheritableFieldValue("/DR"));
}
else
{
QTC::TC("qpdf", "QPDFPageDocumentHelper non-widget annotation");
}
new_content += aoh.getPageContentForAppearance(rotate);
}
else
{
new_annots.push_back(aoh.getObjectHandle());
}
}
if (new_annots.size() != annots.size())
{
QPDFObjectHandle page_oh = page.getObjectHandle();
if (new_annots.empty())
{
QTC::TC("qpdf", "QPDFPageDocumentHelper remove annots");
page_oh.removeKey("/Annots");
}
else
{
QPDFObjectHandle old_annots = page_oh.getKey("/Annots");
QPDFObjectHandle new_annots_oh =
QPDFObjectHandle::newArray(new_annots);
if (old_annots.isIndirect())
{
QTC::TC("qpdf", "QPDFPageDocumentHelper replace indirect annots");
this->qpdf.replaceObject(
old_annots.getObjGen(), new_annots_oh);
}
else
{
QTC::TC("qpdf", "QPDFPageDocumentHelper replace direct annots");
page_oh.replaceKey("/Annots", new_annots_oh);
}
}
page.addPageContents(
QPDFObjectHandle::newStream(&qpdf, "q\n"), true);
page.addPageContents(
QPDFObjectHandle::newStream(&qpdf, "\nQ\n" + new_content), false);
}
}

17
qpdf/qpdf.cc
View File

@ -102,6 +102,7 @@ struct Options
keep_files_open_set(false),
newline_before_endstream(false),
coalesce_contents(false),
flatten_annotations(false),
show_npages(false),
deterministic_id(false),
static_id(false),
@ -174,6 +175,7 @@ struct Options
bool newline_before_endstream;
std::string linearize_pass1;
bool coalesce_contents;
bool flatten_annotations;
std::string min_version;
std::string force_version;
bool show_npages;
@ -473,6 +475,7 @@ class ArgParser
void argNewlineBeforeEndstream();
void argLinearizePass1(char* parameter);
void argCoalesceContents();
void argFlattenAnnotations();
void argMinVersion(char* parameter);
void argForceVersion(char* parameter);
void argSplitPages(char* parameter);
@ -670,6 +673,7 @@ ArgParser::initOptionTable()
(*t)["linearize-pass1"] = oe_requiredParameter(
&ArgParser::argLinearizePass1, "filename");
(*t)["coalesce-contents"] = oe_bare(&ArgParser::argCoalesceContents);
(*t)["flatten-annotations"] = oe_bare(&ArgParser::argFlattenAnnotations);
(*t)["min-version"] = oe_requiredParameter(
&ArgParser::argMinVersion, "version");
(*t)["force-version"] = oe_requiredParameter(
@ -1118,6 +1122,12 @@ ArgParser::argCoalesceContents()
o.coalesce_contents = true;
}
void
ArgParser::argFlattenAnnotations()
{
o.flatten_annotations = true;
}
void
ArgParser::argMinVersion(char* parameter)
{
@ -1759,6 +1769,9 @@ familiar with the PDF file format or who are PDF developers.\n\
preserve unreferenced page resources\n\
--newline-before-endstream always put a newline before endstream\n\
--coalesce-contents force all pages' content to be a single stream\n\
--flatten-annotations incorporate rendering of annotations into page\n\
contents including those for interactive form\n\
fields\n\
--qdf turns on \"QDF mode\" (below)\n\
--linearize-pass1=file write intermediate pass of linearized file\n\
for debugging\n\
@ -3124,6 +3137,10 @@ static void do_inspection(QPDF& pdf, Options& o)
static void handle_transformations(QPDF& pdf, Options& o)
{
QPDFPageDocumentHelper dh(pdf);
if (o.flatten_annotations)
{
dh.flattenAnnotations();
}
if (o.coalesce_contents)
{
std::vector<QPDFPageObjectHelper> pages = dh.getAllPages();

12
qpdf/qpdf.testcov
View File

@ -377,3 +377,15 @@ QPDFObjectHandle merge array dup 0
QPDFObjectHandle merge copy from other 0
QPDFObjectHandle merge loop 0
QPDFObjectHandle merge equal indirect 0
QPDFAnnotationObjectHelper explicit matrix 0
QPDFAnnotationObjectHelper default matrix 0
QPDFAnnotationObjectHelper rotate 90 0
QPDFAnnotationObjectHelper rotate 180 0
QPDFAnnotationObjectHelper rotate 270 0
QPDFPageDocumentHelper indirect resources 0
QPDFPageDocumentHelper skip widget need appearances 0
QPDFPageDocumentHelper merge DR 0
QPDFPageDocumentHelper non-widget annotation 0
QPDFPageDocumentHelper remove annots 0
QPDFPageDocumentHelper replace indirect annots 0
QPDFPageDocumentHelper replace direct annots 0

56
qpdf/qtest/qpdf.test
View File

@ -1445,6 +1445,62 @@ $td->runtest("check output",
{$td->FILE => "a.pdf"},
{$td->FILE => "minimal-rotated.pdf"});
show_ntests();
# ----------
$td->notify("--- Flatten Form/Annotations ---");
# manual-appearances was created by hand-coding appearance streams
# with graphics that make it easy to test matrix calculations. The
# result of flattening the annotations was compared visually with
# okular. Some PDF viewers don't actually display the original version
# correctly. The pages are as follows:
# - page 1: normal
# - page 2: rotate 90 with /F 20 (NoRotate)
# - page 3: non-trivial matrix
# - page 4: non-trivial matrix, rotate
# - page 5: rotate 180 with /F 20
# - page 6: rotate 90, /F 20, non-trivial matrix
# - page 7: normal -- available for additional testing
# - page 8: rotate 270 with /F 20
# - page 9: normal -- available for additional testing
#
# form-filled-by-acrobat was filled in using the Acrobat Reader
# android app. One of its appearance streams is actually an image.
#
# need-appearances is based on form-field-types with manual edits to
# turn on NeedAppearances, change /V for a field, and add the comment
# annotation from comment-annotation.pdf. The test output includes a
# flattened version of the comment annotation but not of the form
# fields.
my @annotation_files = (
'manual-appearances',
'form-filled-by-acrobat',
'comment-annotation',
'comment-annotation-direct',
'form-field-types',
'need-appearances',
);
$n_tests += 2 * scalar(@annotation_files);
foreach my $f (@annotation_files)
{
my $exp_out = {$td->STRING => "", $td->EXIT_STATUS => 0};
if (-f "$f-warn.out")
{
$exp_out = {$td->FILE => "$f-warn.out", $td->EXIT_STATUS => 3};
}
$td->runtest("flatten $f",
{$td->COMMAND =>
"qpdf --qdf --static-id --no-original-object-ids" .
" --flatten-annotations $f.pdf a.pdf"},
$exp_out,
$td->NORMALIZE_NEWLINES);
copy("a.pdf", "$f-out.pdf");
$td->runtest("check output",
{$td->FILE => "a.pdf"},
{$td->FILE => "$f-out.pdf"});
}
show_ntests();
# ----------
$td->notify("--- Merging and Splitting ---");

232
qpdf/qtest/qpdf/comment-annotation-direct-out.pdf Normal file
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@ -0,0 +1,232 @@
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182
qpdf/qtest/qpdf/comment-annotation-direct.pdf Normal file
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237
qpdf/qtest/qpdf/comment-annotation-out.pdf Normal file
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