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PDF::Class cpan:WARRINGD last updated on 2018-08-07

PDF-Class-0.2.8/

PDF::Class

PDF::Class provides a set of roles and classes that map to the internal structure of PDF documents; the aim being to make it easier to read, write and validate PDF files.

It assists with the construction of valid PDF documents, providing type-checking and the sometimes finicky serialization rules regarding objects.

This is the base class for PDF::API6.

Description

The top level of a PDF document is of type PDF::Class. It contains the PDF::Catalog as its Root entry.

use PDF::Class;
use PDF::Catalog;
use PDF::Page;

my PDF::Class $pdf .= open: "t/helloworld.pdf";
my PDF::Catalog $catalog = $pdf.Root;
given $catalog.ViewerPreferences //= {} {
    .HideToolbar = True;
}
my PDF::Page $new-page = $pdf.add-page;
#...

This module is a work in progress. It currently defines roles and classes for many of the more commonly occurring PDF objects as described in the PDF 32000-1:2008 1.7 specification.

More examples:

Set Marked Info options

use PDF::Class;
use PDF::Catalog;
my PDF::Class $pdf .= new;
my PDF::Catalog $catalog = $pdf.catalog;
with $catalog.MarkInfo //= {} {
    .Marked = True;
    .UserProperties = False;
    .Suspects = False;
}

Set Page Layout & Viewer Preferences

use PDF::Class;
use PDF::Catalog;
my PDF::Class $pdf .= new;

my PDF::Catalog $doc = $pdf.catalog;
$doc.PageLayout = 'TwoColumnLeft';
$doc.PageMode   = 'UseThumbs';

given $doc.ViewerPreferences //= {} {
    .Duplex = 'DuplexFlipShortEdge';
    .NonFullScreenPageMode = 'UseOutlines';
}
# ...etc, see PDF::ViewerPreferences

List AcroForm Fields

use PDF::Class;
use PDF::AcroForm;
use PDF::Field;

my PDF::Class $doc .= open: "t/pdf/samples/OoPdfFormExample.pdf";
with my PDF::AcroForm $acroform = $doc.catalog.AcroForm {
    my PDF::Field @fields = $acroform.fields;
    # display field names and values
    for @fields -> $field {
        say "{$field.key}: {$field.value}";
    }
}

Gradual Types

In general, PDF::Class provides accessors for structured access and safe update of PDF objects.

However is is also possible to bypass these accessors; instead access hashes and arrays directly, giving raw access to the PDF data.

This will also bypass type coercements, so you may need to be more explicit. In the following example we cast the PageMode to a name, so it appears as a name in the out put stream :name<UseToes>, rather than a string 'UseToes'.

use PDF::Class;
use PDF::Catalog;
my PDF::Class $pdf .= new;

my PDF::Catalog $doc = $pdf.catalog;
try {
    $doc.PageMode   = 'UseToes';
    CATCH { default { say "err, that didn't work: $_" } }
}

# same again, bypassing type checking
$doc<PageMode>  = :name<UseToes>;

Scripts in this Distribution

pdf-append.p6 --save-as=output.pdf in1.pdf in2.pdf ...

appends PDF files.

pdf-burst.p6 --save-as=basename-%03d.pdf --password=pass in.pdf

bursts a multi-page PDF into single page PDF files

pdf-checker.p6 --trace --render --strict --exclude=Entry1,Entry2 --repair input-pdf

This is a low-level tool for PDF authors and users. It traverses a PDF, checking it's internal structure against PDF:Class definitions as derived from the PDF 32000-1:2008 1.7 specification.

Example 1: Dump a simple PDF

% pdf-checker.p6 --trace t/helloworld.pdf
xref:   << /ID ... /Info 1 0 R /Root 2 0 R >>   % PDF::Class
  /ID:  [ "×C¨\x[86]üÜø\{iÃeH!\x[9E]©A" "×C¨\x[86]üÜø\{iÃeH!\x[9E]©A" ] % PDF::COS::Array[Str]
  /Info:        << /Author "t/helloworld.t" /CreationDate (D:20151225000000Z00'00') /Creator "PDF::Class" /Producer "Perl 6 PDF::Class 0.2.5" >>        % PDF::COS::Dict+{PDF::Info}
  /Root:        << /Type /Catalog /Pages 3 0 R >>       % PDF::Catalog
    /Pages:     << /Type /Pages /Count 1 /Kids ... /Resources ... >>    % PDF::Pages
      /Kids:    [ 4 0 R ]       % PDF::COS::Array[PDF::Content::PageNode]
        [0]:    << /Type /Page /Contents 5 0 R /MediaBox ... /Parent 3 0 R >>   % PDF::Page
          /Contents:    << /Length 1944 >>      % PDF::COS::Stream
          /MediaBox:    [ 0 0 595 842 ] % PDF::COS::Array[Numeric]
      /Resources:       << /ExtGState ... /Font ... /ProcSet ... /XObject ... >>        % PDF::COS::Dict+{PDF::Resources}
        /ExtGState:     << /GS1 6 0 R >>        % PDF::COS::Dict[Hash]
          /GS1: << /Type /ExtGState /ca 0.5 >>  % PDF::COS::Dict+{PDF::ExtGState}
        /Font:  << /F1 7 0 R /F2 8 0 R /F3 9 0 R >>     % PDF::COS::Dict[PDF::Resources::Font]
          /F1:  << /Type /Font /Subtype /Type1 /BaseFont /Helvetica-Bold /Encoding /WinAnsiEncoding >>  % PDF::Font::Type1
          /F2:  << /Type /Font /Subtype /Type1 /BaseFont /Helvetica /Encoding /WinAnsiEncoding >>       % PDF::Font::Type1
          /F3:  << /Type /Font /Subtype /Type1 /BaseFont /ZapfDingbats >>       % PDF::Font::Type1
        /ProcSet:       [ /PDF /Text ]  % PDF::COS::Array[PDF::COS::Name]
        /XObject:       << /Im1 10 0 R /Im2 11 0 R >>   % PDF::COS::Dict[PDF::Resources::XObject]
          /Im1: << /Type /XObject /Subtype /Image /BitsPerComponent 8 /ColorSpace /DeviceRGB /Filter /DCTDecode /Height 254 /Width 200 /Length 8247 >>  % PDF::XObject::Image
          /Im2: << /Type /XObject /Subtype /Image /BitsPerComponent 8 /ColorSpace ... /Height 42 /Width 37 /Length 1554 >>      % PDF::XObject::Image
            /ColorSpace:        [ /Indexed /DeviceRGB 255 12 0 R ]      % PDF::ColorSpace::Indexed
              [3]:      << /Length 768 >>       % PDF::COS::Stream
Checking of t/helloworld.pdf completed with 0 warnings and 0 errors

This example dumps a PDF and shows how PDF::Class has interpreted it.

The PDF contains has one page (PDF::Page) that references various other objects, such as fonts and xobject images.

Example 2: Check a sample PDF

% wget http://www.stillhq.com/pdfdb/000025/data.pdf
% pdf-checker.p6 --strict --render data.pdf
Warning: Error processing indirect object 27 0 R at byte offset 976986:
Ignoring 1 bytes before 'endstream' marker
Rendering warning(s) in 28 0 R (PDF::Page):
-- unexpected operation 'w' (SetLineWidth) used in Path context, following 'm' (MoveTo)
-- unexpected operation 'w' (SetLineWidth) used in Path context, following 'm' (MoveTo)
Rendering warning(s) in 30 0 R  (PDF::XObject::Form):
-- unexpected operation 'w' (SetLineWidth) used in Path context, following 'm' (MoveTo)
Unknown entries 1 0 R (PDF::Catalog) struct: /ViewPreferences
Checking of /home/david/Documents/test-pdf/000025.pdf completed with 5 warnings and 0 errors

In this example:

Notes

pdf-content-dump.p6 --perl in.pdf

Displays the content streams for PDF pages, commented, and in a human-readable format:

% pdf-content-dump.p6 t/example.pdf 
% **** Page 1 ****
BT % BeginText
  1 0 0 1 100 150 Tm % SetTextMatrix
  /F1 16 Tf % SetFont
  17.6 TL % SetTextLeading
  [ (Hello, world!) ] TJ % ShowSpaceText
  T* % TextNextLine
ET % EndText

The --perl option dumps using a Perl-like notation:

pdf-content-dump.p6 --perl t/example.pdf 
# **** Page 1 ****
.BeginText();
  .SetTextMatrix(1, 0, 0, 1, 100, 150);
  .SetFont("F1", 16);
  .SetTextLeading(17.6);
  .ShowSpaceText($["Hello, world!"]);
  .TextNextLine();
.EndText();

pdf-info.p6 in.pdf

Prints various PDF properties. For example:

% pdf-info.p6 ~/Documents/test-pdfs/stillhq.com/000056.pdf 
File:         /home/david/Documents/test-pdfs/stillhq.com/000056.pdf
File Size:    63175 bytes
Pages:        2
Outlines:     no
Author:       Prince Restaurant
CreationDate: Wed Oct 03 23:41:01 2001
Creator:      FrameMaker+SGML 6.0
Keywords:     Pizza, Pasta, Antipasto, Lasagna, Food
ModDate:      Thu Oct 04 00:03:04 2001
Producer:     Acrobat PDFWriter 4.05  for Power Macintosh
Subject:      Take Out & Catering Menu
Title:        Prince Pizzeria & Bar
Tagged:       no
Page Size:    variable
PDF version:  1.3
Revisions:    2
Encryption:   no

pdf-revert.p6 --password=pass --save-as=out.pdf in.pdf

undoes the last revision of an incrementally saved PDF file.

pdf-toc.p6 --password=pass --/title --/labels in.pdf

prints a table of contents, showing titles and page-numbers, using PDF outlines.

% wget http://www.stillhq.com/pdfdb/000432/data.pdf
% pdf-toc.p6 data.pdf
Linux Kernel Modules Installation HOWTO
  Table of Contents . . . i
  1. Purpose of this Document . . . 1
  2. Pre-requisites . . . 2
  3. Compiler Speed-up . . . 3
  4. Recompiling the Kernel for Modules . . . 4
    5.1. Configuring Debian or RedHat for Modules . . . 5
    5.2. Configuring Slackware for Modules . . . 5
    5.3. Configuring Other Distributions for Modules . . . 6

Note that outlines are an optional PDF feature. pdf-info.p6 can be used to check if a PDF has them:

% pdf-info.p6 my-doc.pdf | grep Outlines:

Development Status

The PDF::Class module is under construction and not yet functionally complete.

Classes Quick Reference

Class Types Accessors Methods Description
PDF::Class dict Encrypt, ID, Info, Root(catalog), Size Pages, ast, crypt, encrypt, open, permitted, save-as, update, version PDF entry-point. either a trailer dict or an XRef stream
PDF::Catalog dict AA(additional-actions), AcroForm, Collection, Dests, Lang, Legal, MarkInfo, Metadata, Names, NeedsRendering, OCProperties, OpenAction, Outlines, OutputIntents, PageLabels, PageLayout, PageMode, Pages, Perms, PieceInfo, Requirements, Resources, SpiderInfo, StructTreeRoot, Threads, Type, URI, Version, ViewerPreferences core-font, find-resource, images, resource-entry, resource-key, use-font, use-resource /Type /Catalog - usually the document root in a PDF See [PDF 1.7 Section 3.6.1 Document Catalog]
PDF::AcroForm dict CO(calculation-order), DA(default-appearance), DR(default-resources), Fields, NeedAppearances, Q(quadding), SigFlags, XFA fields, fields-hash
PDF::Action::GoTo dict D(destination), Next, S, Type /Action Subtype - GoTo
PDF::Action::GoToR dict D(destination), F(file), NewWindow, Next, S, Type /Action Subtype - GoToR
PDF::Action::JavaScript dict JS, Next, S, Type /Action Subtype - GoTo
PDF::Action::Launch dict F(file), Mac, NewWindow, Next, S, Type, Unix, Win /Action Subtype - Launch
PDF::Action::Named dict N(action-name), Next, S, Type /Action Subtype - GoTo
PDF::Action::URI dict Base, IsMap, Next, S, Type, URI /Action Subtype - URI
PDF::Annot::Caret dict AP(appearance), AS(appearance-state), BS(border-style), Border, C(color), CA(constant-opacity), Contents, CreationDate, DR(default-resources), ExData(external-data), F(flags), IRT(reply-to-ref), IT(intent), M(mod-time), NM(annotation-name), OC(optional-content), P(page), Popup, RC(rich-text), RD(rectangle-differences), RT(reply-type), Rect, StructParent, Subtype, Sy(symbol), T(text-label), Type
PDF::Annot::Circle dict AP(appearance), AS(appearance-state), BE(border-effect), BS(border-style), Border, C(color), CA(constant-opacity), Contents, CreationDate, DR(default-resources), ExData(external-data), F(flags), IC(interior-color), IRT(reply-to-ref), IT(intent), M(mod-time), NM(annotation-name), OC(optional-content), P(page), Popup, RC(rich-text), RD(rectangle-differences), RT(reply-type), Rect, StructParent, Subtype, T(text-label), Type
PDF::Annot::FileAttachment dict AP(appearance), AS(appearance-state), BS(border-style), Border, C(color), CA(constant-opacity), Contents, CreationDate, DR(default-resources), ExData(external-data), F(flags), FS(file-spec), IRT(reply-to-ref), IT(intent), M(mod-time), NM(annotation-name), Name(icon-name), OC(optional-content), P(page), Popup, RC(rich-text), RT(reply-type), Rect, StructParent, Subtype, T(text-label), Type
PDF::Annot::Link dict A(action), AP(appearance), AS(appearance-state), BS, Border, C(color), CA(constant-opacity), Contents, CreationDate, DR(default-resources), Dest, ExData(external-data), F(flags), H(highlight-mode), IRT(reply-to-ref), IT(intent), M(mod-time), NM(annotation-name), OC(optional-content), P(page), PA(uri-action), Popup, QuadPoints, RC(rich-text), RT(reply-type), Rect, StructParent, Subtype, T(text-label), Type
PDF::Annot::Markup dict AP(appearance), AS(appearance-state), BS(border-style), Border, C(color), CA(constant-opacity), Contents, CreationDate, DR(default-resources), ExData(external-data), F(flags), IRT(reply-to-ref), IT(intent), M(mod-time), NM(annotation-name), OC(optional-content), P(page), Popup, RC(rich-text), RT(reply-type), Rect, StructParent, Subtype, T(text-label), Type
PDF::Annot::Popup dict AP(appearance), AS(appearance-state), BS(border-style), Border, C(color), Contents, DR(default-resources), F(flags), M(mod-time), NM(annotation-name), OC(optional-content), Open, P(page), Parent, Rect, StructParent, Subtype, Type
PDF::Annot::Square dict AP(appearance), AS(appearance-state), BE(border-effect), BS(border-style), Border, C(color), CA(constant-opacity), Contents, CreationDate, DR(default-resources), ExData(external-data), F(flags), IC(interior-color), IRT(reply-to-ref), IT(intent), M(mod-time), NM(annotation-name), OC(optional-content), P(page), Popup, RC(rich-text), RD(rectangle-differences), RT(reply-type), Rect, StructParent, Subtype, T(text-label), Type
PDF::Annot::Text dict AP(appearance), AS(appearance-state), BS(border-style), Border, C(color), CA(constant-opacity), Contents, CreationDate, DR(default-resources), ExData(external-data), F(flags), IRT(reply-to-ref), IT(intent), M(mod-time), NM(annotation-name), Name(icon-name), OC(optional-content), Open, P(page), Popup, RC(rich-text), RT(reply-type), Rect, State, StateModel, StructParent, Subtype, T(text-label), Type /Type Annot - Annonation subtypes See [PDF 1.7 Section 8.4 Annotations]
PDF::Annot::ThreeD dict 3DA(activation), 3DB(view-box), 3DD(artwork), 3DI(interactive), 3DV(default-view), AP(appearance), AS(appearance-state), BS(border-style), Border, C(color), Contents, DR(default-resources), F(flags), M(mod-time), NM(annotation-name), OC(optional-content), P(page), Rect, StructParent, Subtype, Type
PDF::Annot::Widget dict A(action), AA(additional-actions), AP(appearance), AS(appearance-state), BS(border-style), Border, C(color), Contents, DR(default-resources), F(flags), H(highlight-mode), M(mod-time), MK, NM(annotation-name), OC(optional-content), P(page), Rect, StructParent, Subtype, Type
PDF::Appearance dict D(down), N(normal), R(rollover)
PDF::Border dict D(dash-pattern), S(style), Type, W(width)
PDF::CIDSystemInfo dict Ordering, Registry, Supplement
PDF::CMap stream CIDSystemInfo, CMapName, Type, UseCMap, WMode /Type /CMap
PDF::Class::ThreeD dict 3DA(activation), 3DB(view-box), 3DD(artwork), 3DI(interactive), 3DV(default-view)
PDF::ColorSpace::CalGray array Subtype, dict BlackPoint, Gamma, WhitePoint
PDF::ColorSpace::CalRGB array Subtype, dict BlackPoint, Gamma, Matrix, WhitePoint
PDF::ColorSpace::DeviceN array AlternateSpace, Attributes, Names, Subtype, TintTransform
PDF::ColorSpace::ICCBased array Subtype, dict Alternate, Metadata, N, Range
PDF::ColorSpace::Indexed array Base, Hival, Lookup, Subtype
PDF::ColorSpace::Lab array Subtype, dict BlackPoint, Range, WhitePoint
PDF::ColorSpace::Pattern array Colorspace, Subtype
PDF::ColorSpace::Separation array AlternateSpace, Name, Subtype, TintTransform
PDF::Destination array fit, page delegate-destination, is-page-ref
PDF::Encoding dict BaseEncoding, Differences, Type
PDF::ExtGState dict AIS(alpha-source-flag), BG(black-generation-old), BG2(black-generation), BM(blend-mode), CA(stroke-alpha), D(dash-pattern), FL(flatness-tolerance), Font, HT(halftone), LC(line-cap), LJ(line-join), LW(line-width), ML(miter-limit), OP(overprint-paint), OPM(overprint-mode), RI(rendering-intent), SA(stroke-adjustment), SM(smoothness-tolerance), SMask(soft-mask), TK(text-knockout), TR(transfer-function-old), TR2(transfer-function), Type, UCR(under-color-removal-old), UCR2(under-color-removal), ca(fill-alpha), op(overprint-stroke) transparency
PDF::Field::Button dict DV(default-value), Opt, V(value)
PDF::Field::Choice dict DV(default-value), I(indices), Opt, TI(top-index), V(value)
PDF::Field::Signature dict Lock, SV(seed-value), V(value)
PDF::Field::Text dict DV(default-value), MaxLen, V(value)
PDF::Font::CIDFont dict BaseFont, CIDSystemInfo, CIDToGIDMap, DW(default-width), DW2(default-width-and-height), FontDescriptor, W(widths), W2(heights)
PDF::Font::CIDFontType0 dict BaseFont, CIDSystemInfo, CIDToGIDMap, DW(default-width), DW2(default-width-and-height), FontDescriptor, Subtype, Type, W(widths), W2(heights) font-obj, make-font, set-font-obj
PDF::Font::CIDFontType2 dict BaseFont, CIDSystemInfo, CIDToGIDMap, DW(default-width), DW2(default-width-and-height), FontDescriptor, Subtype, Type, W(widths), W2(heights) font-obj, make-font, set-font-obj
PDF::Font::MMType1 dict BaseFont, Encoding, FirstChar, FontDescriptor, LastChar, Name, Subtype, ToUnicode, Type, Widths font-obj, make-font, set-font-obj
PDF::Font::TrueType dict BaseFont, Encoding, FirstChar, FontDescriptor, LastChar, Name, Subtype, ToUnicode, Type, Widths font-obj, make-font, set-font-obj TrueType fonts - /Type /Font /Subtype TrueType see [PDF 1.7 Section 5.5.2 TrueType Fonts]
PDF::FontDescriptor dict Ascent, AvgWidth, CapHeight, CharSet, Descent, Flags, FontBBox, FontFamily, FontFile, FontFile2, FontFile3, FontName, FontStretch, FontWeight, ItalicAngle, Leading, MaxWidth, MissingWidth, StemH, StemV, Type, XHeight
PDF::FontFile stream Length1, Length2, Length3, Metadata, Subtype
PDF::FontStream dict Length1, Length2, Length3, Metadata
PDF::Function::Exponential stream C0, C1, Domain, FunctionType, N, Range calc, calculator /FunctionType 2 - Exponential see [PDF 1.7 Section 3.9.2 Type 2 (Exponential Interpolation) Functions]
PDF::Function::PostScript stream Domain, FunctionType, Range calc, calculator, parse /FunctionType 4 - PostScript see [PDF 1.7 Section 3.9.4 Type 4 (PostScript Transform) Functions]
PDF::Function::Sampled stream BitsPerSample, Decode, Domain, Encode, FunctionType, Order, Range, Size calc, calculator /FunctionType 0 - Sampled see [PDF 1.7 Section 3.9.1 Type 0 (Sampled) Functions]
PDF::Function::Stitching stream Bounds, Domain, Encode, FunctionType, Functions, Range calc, calculator /FunctionType 3 - Stitching see [PDF 1.7 Section 3.9.3 Type 3 (Stitching) Functions]
PDF::Group::Transparency dict CS(color-space), I(isolated), K(knockout), S, Type
PDF::Image stream Alternatives, BitsPerComponent, ColorSpace, Decode, Height, ID, ImageMask, Intent, Interpolate, Mask, Metadata, Name, OC, OPI, SMask, SMaskInData, StructParent, Width to-png
PDF::MCR dict MCID, Pg(page), Stm, StmOwn, Type
PDF::Mask::Alpha dict BC(backdrop-color), G(transparency-group), S(subtype), TR(transfer-function), Type
PDF::Mask::Luminosity dict BC(backdrop-color), G(transparency-group), S(subtype), TR(transfer-function), Type
PDF::Metadata::XML stream Metadata, Subtype, Type
PDF::NameTree dict Kids, Limits, Names
PDF::NumberTree dict Kids, Limits, Nums
PDF::OBJR dict Obj, Pg(page), Type /Type /OBJR - Object Reference dictionary
PDF::OCG dict Intent, Name, Type, Usage
PDF::OCMD dict OCGs, P(visibility-policy), Type, VE(visibility-expression)
PDF::Outline dict A(action), C(color), Count, Dest, F(flags), First, Last, Next, Parent, Prev, SE(structure-element), Title
PDF::Outlines dict Count, First, Last, Type
PDF::OutputIntent::GTS_PDFX dict DestOutputProfile, Info, OutputCondition, OutputConditionIdentifier, RegistryName, S, Type
PDF::Page dict AA(additional-actions), Annots, ArtBox, B(beads), BleedBox, BoxColorInfo, Contents, CropBox, Dur(display-duration), Group, ID, LastModified, MediaBox, Metadata, PZ(preferred-zoom), Parent, PieceInfo, PressSteps, Resources, Rotate, SeparationInfo, StructParents, Tabs, TemplateInstantiated, Thumb(thumbnail-image), Trans(transition-effect), TrimBox, Type, UserUnit, VP(view-ports) art-box, bbox, bleed-box, canvas, contents, contents-parse, core-font, crop-box, fields, fields-hash, find-resource, finish, gfx, graphics, has-pre-gfx, height, images, media-box, new-gfx, pre-gfx, pre-graphics, render, resource-entry, resource-key, save-as-image, text, tiling-pattern, to-landscape, to-xobject, trim-box, use-font, use-resource, width, xobject-form /Type /Page - describes a single PDF page
PDF::Pages dict Count, CropBox, Kids, MediaBox, Parent, Resources, Rotate, Type add-page, add-pages, art-box, bbox, bleed-box, core-font, crop-box, find-resource, height, images, media-box, page-count, page-index, resource-entry, resource-key, to-landscape, trim-box, use-font, use-resource, width /Type /Pages - a node in the page tree
PDF::Pattern::Shading dict ExtGState, Matrix, PatternType, Shading, Type /ShadingType 2 - Axial
PDF::Pattern::Tiling stream BBox, Matrix, PaintType, PatternType, Resources, TilingType, Type, XStep, YStep canvas, contents, contents-parse, core-font, find-resource, finish, gfx, graphics, has-pre-gfx, height, images, new-gfx, open, pre-gfx, pre-graphics, render, resource-entry, resource-key, save-as-image, text, tiling-pattern, use-font, use-resource, width, xobject-form /PatternType 1 - Tiling
PDF::Resources dict ColorSpace, ExtGState, Font, Pattern, ProcSet, Properties, Shading, XObject
PDF::Shading::Axial dict AntiAlias, BBox, Background, ColorSpace, Coords, Domain, Extend, Function, ShadingType /ShadingType 2 - Axial
PDF::Shading::Coons stream AntiAlias, BBox, Background, BitsPerComponent, BitsPerCoordinate, BitsPerFlag, ColorSpace, Decode, Function, ShadingType /ShadingType 6 - Coons
PDF::Shading::FreeForm stream AntiAlias, BBox, Background, BitsPerComponent, BitsPerCoordinate, BitsPerFlag, ColorSpace, Decode, Function, ShadingType /ShadingType 4 - FreeForm
PDF::Shading::Function dict AntiAlias, BBox, Background, ColorSpace, Domain, Function, Matrix, ShadingType /ShadingType 1 - Functional
PDF::Shading::Lattice stream AntiAlias, BBox, Background, BitsPerComponent, BitsPerCoordinate, ColorSpace, Decode, Function, ShadingType, VerticesPerRow /ShadingType 5 - Lattice
PDF::Shading::Radial dict AntiAlias, BBox, Background, ColorSpace, Coords, Domain, Extend, Function, ShadingType /ShadingType 3 - Radial
PDF::Shading::Tensor stream AntiAlias, BBox, Background, BitsPerComponent, BitsPerCoordinate, BitsPerFlag, ColorSpace, Decode, Function, ShadingType /ShadingType 7 - Tensor
PDF::Signature dict ByteRange, Cert, Changes, ContactInfo, Contents, Location, M(date-signed), Name, Prop_AuthTime, Prop_AuthType, Prop_Build, Reason, Reference, SubFilter, Type, V
PDF::StructElem dict A(attributes), ActualText, Alt(alternative-description), C, E(expanded-form), ID, K(kids), Lang, P(parent), Pg(page), R(revision), S(structure-type), T(title), Type
PDF::StructTreeRoot dict ClassMap, IDTree, K(kids), ParentTree, ParentTreeNextKey, RoleMap, Type
PDF::ViewerPreferences dict CenterWindow, Direction, DisplayDocTitle, Duplex, FitWindow, HideMenubar, HideToolbar, HideWindowUI, NonFullScreenPageMode, NumCopies, PickTrayByPDFSize, PrintArea, PrintPageRange, PrintScaling, ViewArea, ViewClip
PDF::XObject::Form stream BBox, FormType, Group, LastModified, Matrix, Metadata, Name, OC(optional-content-group), OPI, PieceInfo, Ref, Resources, StructParent, StructParents, Subtype, Type canvas, contents, contents-parse, core-font, find-resource, finish, gfx, graphics, has-pre-gfx, height, images, new-gfx, open, pre-gfx, pre-graphics, render, resource-entry, resource-key, save-as-image, text, tiling-pattern, use-font, use-resource, width, xobject-form XObject Forms - /Type /XObject /Subtype Form See [PDF Spec 1.7 4.9 Form XObjects]
PDF::XObject::Image stream Alternatives, BitsPerComponent, ColorSpace, Decode, Height, ID, ImageMask, Intent, Interpolate, Mask, Metadata, Name, OC, OPI, SMask, SMaskInData, StructParent, Subtype, Type, Width height, image-obj, inline-content, inline-to-xobject, open, to-png, width XObjects /Type XObject /Subtype /Image See [PDF 1.7 Section 4.8 - Images ]
PDF::XObject::PS stream Level1, Subtype, Type Postscript XObjects /Type XObject /Subtype PS See [PDF 1.7 Section 4.7.1 PostScript XObjects]

(generated by etc/make-quick-ref.pl)