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# Code in the PDF::API2::Basic::PDF namespace was originally copied from the |
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# Text::PDF distribution. |
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# |
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# Copyright Martin Hosken |
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# |
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# Martin Hosken's code may be used under the terms of the MIT license. |
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# Subsequent versions of the code have the same license as PDF::API2. |
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package PDF::API2::Basic::PDF::Pages; |
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use strict; |
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use warnings; |
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use base 'PDF::API2::Basic::PDF::Dict'; |
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our $VERSION = '2.044'; # VERSION |
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use PDF::API2::Basic::PDF::Array; |
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use PDF::API2::Basic::PDF::Dict; |
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use PDF::API2::Basic::PDF::Utils; |
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use Scalar::Util qw(weaken); |
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our %inst = map {$_ => 1} qw(Parent Type); |
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=head1 NAME |
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PDF::API2::Basic::PDF::Pages - Low-level page tree object |
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=head1 DESCRIPTION |
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A Pages object is the parent to other pages objects or to page objects |
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themselves. |
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=head1 METHODS |
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=head2 PDF::API2::Basic::PDF::Pages->new($pdf, $parent) |
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This creates a new Pages object in a PDF. Notice that $parent here is |
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not the file context for the object but the parent pages object for |
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this pages. If we are using this class to create a root node, then |
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$parent should point to the file context, which is identified by not |
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having a Type of Pages. $pdf is the file object (or a reference to an |
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array of file objects) in which to create the new Pages object. |
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=cut |
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sub new { |
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my ($class, $pdf, $parent) = @_; |
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741
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$pdf //= $class->get_top->{' parent'} if ref($class); |
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# Prior to 2.034, $pdf could be an array of PDFs |
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if (ref($pdf) eq 'ARRAY') { |
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die 'Only one PDF is supported as of version 2.034' if scalar(@$pdf) > 1; |
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($pdf) = @$pdf; |
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} |
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$class = ref($class) if ref($class); |
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1003
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my $self = $class->SUPER::new($pdf, $parent); |
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850
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$self->{'Type'} = PDFName('Pages'); |
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$self->{'Parent'} = $parent if defined $parent; |
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$self->{'Count'} = PDFNum(0); |
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1428
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$self->{'Kids'} = PDF::API2::Basic::PDF::Array->new(); |
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66
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1035
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$pdf->new_obj($self); |
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868
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unless (defined $self->{'Parent'}) { |
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$pdf->{'Root'}->{'Pages'} = $self; |
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$pdf->out_obj($pdf->{'Root'}); |
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164
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390
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$self->{' parent'} = $pdf; |
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748
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weaken $self->{' parent'}; |
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} |
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weaken $self->{'Parent'} if defined $parent; |
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907
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return $self; |
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} |
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sub _pdf { |
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my $self = shift(); |
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902
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return $self->get_top->{' parent'}; |
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} |
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=head2 $p->find_page($page_number) |
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87
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Returns the given page, using the page count values in the pages tree. Pages |
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start at 0. |
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=cut |
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sub find_page { |
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1
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my ($self, $page_number) = @_; |
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my $top = $self->get_top(); |
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511
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$top->find_page_recurse(\$page_number); |
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} |
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99
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100
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sub find_page_recurse { |
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142
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142
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0
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322
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my ($self, $page_number_ref) = @_; |
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103
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142
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476
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if ($self->{'Count'}->realise->val() <= $$page_number_ref) { |
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0
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0
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$$page_number_ref -= $self->{'Count'}->val(); |
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0
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0
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return; |
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} |
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108
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142
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300
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my $result; |
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460
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foreach my $kid ($self->{'Kids'}->realise->elements()) { |
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if ($kid->{'Type'}->realise->val() eq 'Page') { |
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0
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111
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return $kid if $$page_number_ref == 0; |
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0
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0
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$$page_number_ref--; |
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} |
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elsif ($result = $kid->realise->find_page_recurse($page_number_ref)) { |
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0
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0
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return $result; |
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} |
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} |
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119
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130
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349
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return; |
120
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} |
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122
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=head2 $p->add_page($page, $page_number) |
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124
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Inserts the page before the given $page_number. $page_number can be negative to |
125
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count from the END of the document. -1 is after the last page. Likewise |
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$page_number can be greater than the number of pages currently in the document, |
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to append. |
128
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129
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=cut |
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131
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sub add_page { |
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142
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142
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1
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342
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my ($self, $page, $page_number) = @_; |
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142
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366
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my $top = $self->get_top(); |
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135
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142
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100
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66
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572
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$page_number = -1 unless defined $page_number and $page_number <= $top->{'Count'}->val(); |
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137
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142
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269
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my $previous_page; |
138
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142
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100
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336
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if ($page_number == -1) { |
139
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140
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538
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$previous_page = $top->find_page($top->{'Count'}->val() - 1); |
140
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} |
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else { |
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2
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15
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$page_number = $top->{'Count'}->val() + $page_number + 1 if $page_number < 0; |
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2
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6
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$previous_page = $top->find_page($page_number); |
144
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} |
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146
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142
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292
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my $parent; |
147
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142
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100
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419
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if (defined $previous_page->{'Parent'}) { |
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53
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$parent = $previous_page->{'Parent'}->realise(); |
149
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} |
150
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else { |
151
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130
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232
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$parent = $self; |
152
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} |
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154
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142
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381
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my $parent_kid_count = scalar $parent->{'Kids'}->realise->elements(); |
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156
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142
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235
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my $page_index; |
157
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100
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377
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if ($page_number == -1) { |
158
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258
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$page_index = -1; |
159
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} |
160
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else { |
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2
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6
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for ($page_index = 0; $page_index < $parent_kid_count; $page_index++) { |
162
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2
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50
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11
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last if $parent->{'Kids'}{' val'}[$page_index] eq $previous_page; |
163
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} |
164
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2
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50
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6
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$page_index = -1 if $page_index == $parent_kid_count; |
165
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} |
166
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167
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142
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535
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$parent->add_page_recurse($page->realise(), $page_index); |
168
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142
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569
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for ($parent = $page->{'Parent'}; defined $parent->{'Parent'}; $parent = $parent->{'Parent'}->realise()) { |
169
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0
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0
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$parent->set_modified(); |
170
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0
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0
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$parent->{'Count'}->realise->{'val'}++; |
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} |
172
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142
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399
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$parent->set_modified(); |
173
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142
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438
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$parent->{'Count'}->realise->{'val'}++; |
174
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175
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142
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404
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return $page; |
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} |
177
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178
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sub add_page_recurse { |
179
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142
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142
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0
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359
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my ($self, $page, $page_index) = @_; |
180
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181
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142
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221
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my $parent = $self; |
182
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142
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252
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my $max_kids_per_parent = 8; # Why? |
183
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142
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50
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33
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373
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if (scalar $parent->{'Kids'}->elements() >= $max_kids_per_parent and $parent->{'Parent'} and $page_index < 1) { |
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0
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184
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0
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0
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my $grandparent = $parent->{'Parent'}->realise(); |
185
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0
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0
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$parent = $parent->new($parent->_pdf(), $grandparent); |
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187
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0
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0
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my $grandparent_kid_count = scalar $grandparent->{'Kids'}->realise->elements(); |
188
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0
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0
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my $new_parent_index; |
189
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0
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0
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for ($new_parent_index = 0; $new_parent_index < $grandparent_kid_count; $new_parent_index++) { |
190
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0
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0
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0
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last if $grandparent->{'Kids'}{' val'}[$new_parent_index] eq $self; |
191
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} |
192
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0
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0
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$new_parent_index++; |
193
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0
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0
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0
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$new_parent_index = -1 if $new_parent_index > $grandparent_kid_count; |
194
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0
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0
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$grandparent->add_page_recurse($parent, $new_parent_index); |
195
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} |
196
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else { |
197
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142
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395
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$parent->set_modified(); |
198
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} |
199
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200
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142
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100
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507
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if ($page_index < 0) { |
201
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140
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238
|
push @{$parent->{'Kids'}->realise->{' val'}}, $page; |
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140
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416
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202
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} |
203
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else { |
204
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2
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4
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splice @{$parent->{'Kids'}{' val'}}, $page_index, 0, $page; |
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2
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7
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205
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} |
206
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142
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369
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$page->{'Parent'} = $parent; |
207
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142
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484
|
weaken $page->{'Parent'}; |
208
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} |
209
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210
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sub set_modified { |
211
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284
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284
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0
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444
|
my $self = shift(); |
212
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284
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544
|
$self->_pdf->out_obj($self); |
213
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} |
214
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215
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# Previously documented but not implemented |
216
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0
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0
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0
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0
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sub rebuild_tree { return; } |
217
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218
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=head2 @objects = $p->get_pages() |
219
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220
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Returns a list of page objects in the document in page order |
221
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222
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=cut |
223
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224
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sub get_pages { |
225
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0
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0
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1
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0
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my $self = shift(); |
226
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0
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0
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return $self->get_top->get_pages_recurse(); |
227
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} |
228
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229
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# Renamed for clarity |
230
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0
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0
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0
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0
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sub get_kids { return get_pages_recurse(@_) } |
231
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232
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sub get_pages_recurse { |
233
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0
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0
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0
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0
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my $self = shift(); |
234
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0
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0
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my @pages; |
235
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236
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0
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0
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foreach my $kid ($self->{'Kids'}->elements()) { |
237
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0
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0
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$kid->realise(); |
238
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0
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0
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0
|
if ($kid->{'Type'}->val() eq 'Pages') { |
239
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0
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0
|
push @pages, $kid->get_pages_recurse(); |
240
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} |
241
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else { |
242
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0
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0
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push @pages, $kid; |
243
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} |
244
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} |
245
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246
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0
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0
|
return @pages; |
247
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|
} |
248
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249
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=head2 $p->find_prop($key) |
250
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251
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Searches up through the inheritance tree to find a property. |
252
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253
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|
=cut |
254
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255
|
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|
|
sub find_prop { |
256
|
576
|
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|
576
|
1
|
1099
|
my ($self, $prop) = @_; |
257
|
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258
|
576
|
100
|
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|
|
1720
|
if (defined $self->{$prop}) { |
|
|
100
|
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|
259
|
225
|
50
|
33
|
|
|
1549
|
if (ref($self->{$prop}) and $self->{$prop}->isa('PDF::API2::Basic::PDF::Objind')) { |
260
|
225
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|
803
|
return $self->{$prop}->realise(); |
261
|
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|
} |
262
|
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|
else { |
263
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0
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0
|
return $self->{$prop}; |
264
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|
} |
265
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|
} |
266
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|
|
|
elsif (defined $self->{'Parent'}) { |
267
|
167
|
|
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|
|
525
|
return $self->{'Parent'}->find_prop($prop); |
268
|
|
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|
|
} |
269
|
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|
270
|
184
|
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|
428
|
return; |
271
|
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|
|
|
} |
272
|
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|
273
|
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|
274
|
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|
|
=head2 $p->add_font($pdf, $font) |
275
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|
276
|
|
|
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|
|
Creates or edits the resource dictionary at this level in the hierarchy. If |
277
|
|
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|
|
the font is already supported even through the hierarchy, then it is not added. |
278
|
|
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|
|
279
|
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|
|
=cut |
280
|
|
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|
|
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|
|
281
|
|
|
|
|
|
|
sub add_font { |
282
|
|
|
|
|
|
|
# Maintainer's note: arguments are in a different order than what is shown in the POD |
283
|
0
|
|
|
0
|
1
|
0
|
my ($self, $font, $pdf) = @_; |
284
|
0
|
|
|
|
|
0
|
my $name = $font->{'Name'}->val(); |
285
|
0
|
|
|
|
|
0
|
my $dict = $self->find_prop('Resources'); |
286
|
|
|
|
|
|
|
|
287
|
0
|
0
|
0
|
|
|
0
|
return $self if $dict and defined $dict->{'Font'} and defined $dict->{'Font'}{$name}; |
|
|
|
0
|
|
|
|
|
288
|
|
|
|
|
|
|
|
289
|
0
|
0
|
|
|
|
0
|
unless (defined $self->{'Resources'}) { |
290
|
0
|
0
|
|
|
|
0
|
$dict = $dict ? $dict->copy($pdf) : PDFDict(); |
291
|
0
|
|
|
|
|
0
|
$self->{'Resources'} = $dict; |
292
|
|
|
|
|
|
|
} |
293
|
|
|
|
|
|
|
else { |
294
|
0
|
|
|
|
|
0
|
$dict = $self->{'Resources'}; |
295
|
|
|
|
|
|
|
} |
296
|
0
|
|
0
|
|
|
0
|
$dict->{'Font'} //= PDFDict(); |
297
|
|
|
|
|
|
|
|
298
|
0
|
|
|
|
|
0
|
my $resource = $dict->{'Font'}->val(); |
299
|
0
|
|
0
|
|
|
0
|
$resource->{$name} //= $font; |
300
|
0
|
0
|
0
|
|
|
0
|
if (ref($dict) ne 'HASH' and $dict->is_obj($pdf)) { |
301
|
0
|
|
|
|
|
0
|
$pdf->out_obj($dict); |
302
|
|
|
|
|
|
|
} |
303
|
0
|
0
|
0
|
|
|
0
|
if (ref($resource) ne 'HASH' and $resource->is_obj($pdf)) { |
304
|
0
|
|
|
|
|
0
|
$pdf->out_obj($resource); |
305
|
|
|
|
|
|
|
} |
306
|
|
|
|
|
|
|
|
307
|
0
|
|
|
|
|
0
|
return $self; |
308
|
|
|
|
|
|
|
} |
309
|
|
|
|
|
|
|
|
310
|
|
|
|
|
|
|
|
311
|
|
|
|
|
|
|
=head2 $p->bbox($xmin, $ymin, $xmax, $ymax, [$param]) |
312
|
|
|
|
|
|
|
|
313
|
|
|
|
|
|
|
Specifies the bounding box for this and all child pages. If the values are |
314
|
|
|
|
|
|
|
identical to those inherited then no change is made. $param specifies the attribute |
315
|
|
|
|
|
|
|
name so that other 'bounding box'es can be set with this method. |
316
|
|
|
|
|
|
|
|
317
|
|
|
|
|
|
|
=cut |
318
|
|
|
|
|
|
|
|
319
|
|
|
|
|
|
|
sub bbox { |
320
|
0
|
|
|
0
|
1
|
0
|
my ($self, @bbox) = @_; |
321
|
0
|
|
0
|
|
|
0
|
my $key = $bbox[4] || 'MediaBox'; |
322
|
0
|
|
|
|
|
0
|
my $inherited = $self->find_prop($key); |
323
|
|
|
|
|
|
|
|
324
|
0
|
0
|
|
|
|
0
|
if ($inherited) { |
325
|
0
|
|
|
|
|
0
|
my $is_changed; |
326
|
0
|
|
|
|
|
0
|
my $i = 0; |
327
|
0
|
|
|
|
|
0
|
foreach my $element ($inherited->elements()) { |
328
|
0
|
0
|
|
|
|
0
|
$is_changed = 1 unless $element->val() == $bbox[$i++]; |
329
|
|
|
|
|
|
|
} |
330
|
0
|
0
|
0
|
|
|
0
|
return $self if $i == 4 and not $is_changed; |
331
|
|
|
|
|
|
|
} |
332
|
|
|
|
|
|
|
|
333
|
0
|
|
|
|
|
0
|
my $array = PDF::API2::Basic::PDF::Array->new(); |
334
|
0
|
|
|
|
|
0
|
foreach my $element (@bbox[0..3]) { |
335
|
0
|
|
|
|
|
0
|
$array->add_elements(PDFNum($element)); |
336
|
|
|
|
|
|
|
} |
337
|
0
|
|
|
|
|
0
|
$self->{$key} = $array; |
338
|
|
|
|
|
|
|
|
339
|
0
|
|
|
|
|
0
|
return $self; |
340
|
|
|
|
|
|
|
} |
341
|
|
|
|
|
|
|
|
342
|
|
|
|
|
|
|
=head2 $p->proc_set(@entries) |
343
|
|
|
|
|
|
|
|
344
|
|
|
|
|
|
|
Ensures that the current resource contains all the entries in the proc_sets |
345
|
|
|
|
|
|
|
listed. If necessary it creates a local resource dictionary to achieve this. |
346
|
|
|
|
|
|
|
|
347
|
|
|
|
|
|
|
=cut |
348
|
|
|
|
|
|
|
|
349
|
|
|
|
|
|
|
sub proc_set { |
350
|
306
|
|
|
306
|
1
|
934
|
my ($self, @entries) = @_; |
351
|
|
|
|
|
|
|
|
352
|
306
|
|
|
|
|
864
|
my $dict = $self->find_prop('Resources'); |
353
|
306
|
100
|
66
|
|
|
1164
|
if ($dict and defined $dict->{'ProcSet'}) { |
354
|
142
|
|
|
|
|
396
|
my @missing = @entries; |
355
|
142
|
|
|
|
|
492
|
foreach my $element ($dict->{'ProcSet'}->elements()) { |
356
|
710
|
|
|
|
|
1166
|
@missing = grep { $_ ne $element } @missing; |
|
3550
|
|
|
|
|
7519
|
|
357
|
|
|
|
|
|
|
} |
358
|
142
|
50
|
|
|
|
461
|
return $self if scalar @missing == 0; |
359
|
142
|
50
|
|
|
|
444
|
@entries = @missing if defined $self->{'Resources'}; |
360
|
|
|
|
|
|
|
} |
361
|
|
|
|
|
|
|
|
362
|
306
|
50
|
|
|
|
801
|
unless (defined $self->{'Resources'}) { |
363
|
306
|
100
|
|
|
|
1193
|
$self->{'Resources'} = $dict ? $dict->copy($self->_pdf()) : PDFDict(); |
364
|
|
|
|
|
|
|
} |
365
|
|
|
|
|
|
|
|
366
|
306
|
50
|
|
|
|
1289
|
$self->{'Resources'}{'ProcSet'} = PDFArray() unless defined $self->{'ProcSet'}; |
367
|
|
|
|
|
|
|
|
368
|
306
|
|
|
|
|
785
|
foreach my $e (@entries) { |
369
|
1530
|
|
|
|
|
3208
|
$self->{'Resources'}{'ProcSet'}->add_elements(PDFName($e)); |
370
|
|
|
|
|
|
|
} |
371
|
|
|
|
|
|
|
|
372
|
306
|
|
|
|
|
805
|
return $self; |
373
|
|
|
|
|
|
|
} |
374
|
|
|
|
|
|
|
|
375
|
|
|
|
|
|
|
sub empty { |
376
|
0
|
|
|
0
|
1
|
0
|
my $self = shift(); |
377
|
0
|
|
|
|
|
0
|
my $parent = $self->{'Parent'}; |
378
|
|
|
|
|
|
|
|
379
|
0
|
|
|
|
|
0
|
$self->SUPER::empty(); |
380
|
0
|
0
|
|
|
|
0
|
if (defined $parent) { |
381
|
0
|
|
|
|
|
0
|
$self->{'Parent'} = $parent; |
382
|
0
|
|
|
|
|
0
|
weaken $self->{'Parent'}; |
383
|
|
|
|
|
|
|
} |
384
|
|
|
|
|
|
|
|
385
|
0
|
|
|
|
|
0
|
return $self; |
386
|
|
|
|
|
|
|
} |
387
|
|
|
|
|
|
|
|
388
|
|
|
|
|
|
|
=head2 $p->get_top |
389
|
|
|
|
|
|
|
|
390
|
|
|
|
|
|
|
Returns the top of the pages tree |
391
|
|
|
|
|
|
|
|
392
|
|
|
|
|
|
|
=cut |
393
|
|
|
|
|
|
|
|
394
|
|
|
|
|
|
|
sub get_top { |
395
|
710
|
|
|
710
|
1
|
1055
|
my $self = shift(); |
396
|
|
|
|
|
|
|
|
397
|
710
|
|
|
|
|
1023
|
my $top = $self; |
398
|
710
|
|
|
|
|
1658
|
$top = $top->{'Parent'} while defined $top->{'Parent'}; |
399
|
|
|
|
|
|
|
|
400
|
710
|
|
|
|
|
1556
|
return $top->realise(); |
401
|
|
|
|
|
|
|
} |
402
|
|
|
|
|
|
|
|
403
|
|
|
|
|
|
|
1; |