From 835e373b3eeaabcd0621ed6798ab500f37982fae Mon Sep 17 00:00:00 2001
From: Calvin Morrison <calvin@pobox.com>
Date: Wed, 5 Apr 2023 14:13:39 -0400
Subject: xpdf-no-select-disable

---
 xpdf/OptionalContent.h | 139 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 xpdf/OptionalContent.h

(limited to 'xpdf/OptionalContent.h')

diff --git a/xpdf/OptionalContent.h b/xpdf/OptionalContent.h
new file mode 100644
index 0000000..f00ef29
--- /dev/null
+++ b/xpdf/OptionalContent.h
@@ -0,0 +1,139 @@
+//========================================================================
+//
+// OptionalContent.h
+//
+// Copyright 2008-2013 Glyph & Cog, LLC
+//
+//========================================================================
+
+#ifndef OPTIONALCONTENT_H
+#define OPTIONALCONTENT_H
+
+#include <aconf.h>
+
+#ifdef USE_GCC_PRAGMAS
+#pragma interface
+#endif
+
+#include "gtypes.h"
+#include "Object.h"
+#include "CharTypes.h"
+
+class GString;
+class GList;
+class PDFDoc;
+class TextString;
+class XRef;
+class OptionalContentGroup;
+class OCDisplayNode;
+
+//------------------------------------------------------------------------
+
+class OptionalContent {
+public:
+
+  OptionalContent(PDFDoc *doc);
+  ~OptionalContent();
+
+  // Walk the list of optional content groups.
+  int getNumOCGs();
+  OptionalContentGroup *getOCG(int idx);
+
+  // Find an OCG by indirect reference.
+  OptionalContentGroup *findOCG(Ref *ref);
+
+  // Get the root node of the optional content group display tree
+  // (which does not necessarily include all of the OCGs).
+  OCDisplayNode *getDisplayRoot() { return display; }
+
+  // Evaluate an optional content object -- either an OCG or an OCMD.
+  // If <obj> is a valid OCG or OCMD, sets *<visible> and returns
+  // true; otherwise returns false.
+  GBool evalOCObject(Object *obj, GBool *visible);
+
+private:
+
+  GBool evalOCVisibilityExpr(Object *expr, int recursion);
+
+  XRef *xref;
+  GList *ocgs;			// all OCGs [OptionalContentGroup]
+  OCDisplayNode *display;	// root node of display tree 
+};
+
+//------------------------------------------------------------------------
+
+// Values from the optional content usage dictionary.
+enum OCUsageState {
+  ocUsageOn,
+  ocUsageOff,
+  ocUsageUnset
+};
+
+//------------------------------------------------------------------------
+
+class OptionalContentGroup {
+public:
+
+  static OptionalContentGroup *parse(Ref *refA, Object *obj);
+  ~OptionalContentGroup();
+
+  GBool matches(Ref *refA);
+
+  Unicode *getName();
+  int getNameLength();
+  OCUsageState getViewState() { return viewState; }
+  OCUsageState getPrintState() { return printState; }
+  GBool getState() { return state; }
+  void setState(GBool stateA) { state = stateA; }
+  GBool getInViewUsageAppDict() { return inViewUsageAppDict; }
+  void setInViewUsageAppDict() { inViewUsageAppDict = gTrue; }
+
+private:
+
+  OptionalContentGroup(Ref *refA, TextString *nameA,
+		       OCUsageState viewStateA, OCUsageState printStateA);
+
+  Ref ref;
+  TextString *name;
+  OCUsageState viewState,	// suggested state when viewing
+               printState;	// suggested state when printing
+  GBool state;			// current state (on/off)
+  GBool inViewUsageAppDict;	// true if this OCG is listed in a
+				//   usage app dict with Event=View
+
+  friend class OCDisplayNode;
+};
+
+//------------------------------------------------------------------------
+
+class OCDisplayNode {
+public:
+
+  static OCDisplayNode *parse(Object *obj, OptionalContent *oc, XRef *xref,
+			      int recursion = 0);
+  OCDisplayNode();
+  ~OCDisplayNode();
+
+  Unicode *getName();
+  int getNameLength();
+  OptionalContentGroup *getOCG() { return ocg; }
+  int getNumChildren();
+  OCDisplayNode *getChild(int idx);
+  OCDisplayNode *getParent() { return parent; }
+
+private:
+
+  OCDisplayNode(GString *nameA);
+  OCDisplayNode(OptionalContentGroup *ocgA);
+  void addChild(OCDisplayNode *child);
+  void addChildren(GList *childrenA);
+  GList *takeChildren();
+
+  TextString *name;		// display name
+  OptionalContentGroup *ocg;	// NULL for display labels
+  OCDisplayNode *parent;	// parent node; NULL at root
+  GList *children;		// NULL if there are no children
+				//   [OCDisplayNode]
+};
+
+#endif
-- 
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