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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * PDF parsing using libpoppler.
+ *//*
+ * Authors:
+ * see git history
+ *
+ * Derived from Gfx.h from poppler (?) which derives from Xpdf, Copyright 1996-2003 Glyph & Cog, LLC, which is under GPL2+.
+ *
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef PDF_PARSER_H
+#define PDF_PARSER_H
+
+#ifdef HAVE_CONFIG_H
+# include "config.h" // only include where actually required!
+#endif
+
+#ifdef HAVE_POPPLER
+#include "poppler-transition-api.h"
+
+#ifdef USE_GCC_PRAGMAS
+#pragma interface
+#endif
+
+namespace Inkscape {
+ namespace Extension {
+ namespace Internal {
+ class SvgBuilder;
+ }
+ }
+}
+
+// TODO clean up and remove using:
+using Inkscape::Extension::Internal::SvgBuilder;
+
+#include "glib/poppler-features.h"
+#include "Object.h"
+
+#include <map>
+#include <memory>
+#include <string>
+
+class GooString;
+class XRef;
+class Array;
+class Stream;
+class Parser;
+class Dict;
+class Function;
+class OutputDev;
+class GfxFontDict;
+class GfxFont;
+class GfxPattern;
+class GfxTilingPattern;
+class GfxShadingPattern;
+class GfxShading;
+class GfxFunctionShading;
+class GfxAxialShading;
+class GfxRadialShading;
+class GfxGouraudTriangleShading;
+class GfxPatchMeshShading;
+struct GfxPatch;
+class GfxState;
+struct GfxColor;
+class GfxColorSpace;
+class Gfx;
+class GfxResources;
+class PDFRectangle;
+class AnnotBorderStyle;
+
+class PdfParser;
+
+class ClipHistoryEntry;
+
+//------------------------------------------------------------------------
+
+#ifndef GFX_H
+enum GfxClipType {
+ clipNone,
+ clipNormal,
+ clipEO
+};
+
+enum TchkType {
+ tchkBool, // boolean
+ tchkInt, // integer
+ tchkNum, // number (integer or real)
+ tchkString, // string
+ tchkName, // name
+ tchkArray, // array
+ tchkProps, // properties (dictionary or name)
+ tchkSCN, // scn/SCN args (number of name)
+ tchkNone // used to avoid empty initializer lists
+};
+#endif /* GFX_H */
+
+#define maxOperatorArgs 33
+
+struct PdfOperator {
+ char name[4];
+ int numArgs;
+ TchkType tchk[maxOperatorArgs];
+ void (PdfParser::*func)(Object args[], int numArgs);
+};
+
+#undef maxOperatorArgs
+
+struct OpHistoryEntry {
+ const char *name; // operator's name
+ GfxState *state; // saved state, NULL if none
+ GBool executed; // whether the operator has been executed
+
+ OpHistoryEntry *next; // next entry on stack
+ unsigned depth; // total number of entries descending from this
+};
+
+//------------------------------------------------------------------------
+// PdfParser
+//------------------------------------------------------------------------
+
+//------------------------------------------------------------------------
+// constants
+//------------------------------------------------------------------------
+
+#define pdfFunctionShading 1
+#define pdfAxialShading 2
+#define pdfRadialShading 3
+#define pdfGouraudTriangleShading 4
+#define pdfPatchMeshShading 5
+#define pdfNumShadingTypes 5
+
+
+
+/**
+ * PDF parsing module using libpoppler's facilities.
+ */
+class PdfParser {
+public:
+
+ // Constructor for regular output.
+ PdfParser(XRef *xrefA, SvgBuilder *builderA, int pageNum, int rotate,
+ Dict *resDict,
+ _POPPLER_CONST PDFRectangle *box,
+ _POPPLER_CONST PDFRectangle *cropBox);
+
+ // Constructor for a sub-page object.
+ PdfParser(XRef *xrefA, Inkscape::Extension::Internal::SvgBuilder *builderA,
+ Dict *resDict,
+ _POPPLER_CONST PDFRectangle *box);
+
+ virtual ~PdfParser();
+
+ // Interpret a stream or array of streams.
+ void parse(Object *obj, GBool topLevel = gTrue);
+
+ // Save graphics state.
+ void saveState();
+
+ // Restore graphics state.
+ void restoreState();
+
+ // Get the current graphics state object.
+ GfxState *getState() { return state; }
+
+ // Set the precision of approximation for specific shading fills.
+ void setApproximationPrecision(int shadingType, double colorDelta, int maxDepth);
+
+private:
+
+ XRef *xref; // the xref table for this PDF file
+ SvgBuilder *builder; // SVG generator
+ GBool subPage; // is this a sub-page object?
+ GBool printCommands; // print the drawing commands (for debugging)
+ GfxResources *res; // resource stack
+
+ GfxState *state; // current graphics state
+ GBool fontChanged; // set if font or text matrix has changed
+ GfxClipType clip; // do a clip?
+ int ignoreUndef; // current BX/EX nesting level
+ double baseMatrix[6]; // default matrix for most recent
+ // page/form/pattern
+ int formDepth;
+
+ Parser *parser; // parser for page content stream(s)
+
+ static PdfOperator opTab[]; // table of operators
+
+ int colorDeltas[pdfNumShadingTypes];
+ // max deltas allowed in any color component
+ // for the approximation of shading fills
+ int maxDepths[pdfNumShadingTypes]; // max recursive depths
+
+ ClipHistoryEntry *clipHistory; // clip path stack
+ OpHistoryEntry *operatorHistory; // list containing the last N operators
+
+ //! Caches color spaces by name
+ std::map<std::string, std::unique_ptr<GfxColorSpace>> colorSpacesCache;
+
+ GfxColorSpace *lookupColorSpaceCopy(Object &);
+
+ void setDefaultApproximationPrecision(); // init color deltas
+ void pushOperator(const char *name);
+ OpHistoryEntry *popOperator();
+ const char *getPreviousOperator(unsigned int look_back=1); // returns the nth previous operator's name
+
+ void go(GBool topLevel);
+ void execOp(Object *cmd, Object args[], int numArgs);
+ PdfOperator *findOp(const char *name);
+ GBool checkArg(Object *arg, TchkType type);
+ int getPos();
+
+ // graphics state operators
+ void opSave(Object args[], int numArgs);
+ void opRestore(Object args[], int numArgs);
+ void opConcat(Object args[], int numArgs);
+ void opSetDash(Object args[], int numArgs);
+ void opSetFlat(Object args[], int numArgs);
+ void opSetLineJoin(Object args[], int numArgs);
+ void opSetLineCap(Object args[], int numArgs);
+ void opSetMiterLimit(Object args[], int numArgs);
+ void opSetLineWidth(Object args[], int numArgs);
+ void opSetExtGState(Object args[], int numArgs);
+ void doSoftMask(Object *str, GBool alpha,
+ GfxColorSpace *blendingColorSpace,
+ GBool isolated, GBool knockout,
+ Function *transferFunc, GfxColor *backdropColor);
+ void opSetRenderingIntent(Object args[], int numArgs);
+
+ // color operators
+ void opSetFillGray(Object args[], int numArgs);
+ void opSetStrokeGray(Object args[], int numArgs);
+ void opSetFillCMYKColor(Object args[], int numArgs);
+ void opSetStrokeCMYKColor(Object args[], int numArgs);
+ void opSetFillRGBColor(Object args[], int numArgs);
+ void opSetStrokeRGBColor(Object args[], int numArgs);
+ void opSetFillColorSpace(Object args[], int numArgs);
+ void opSetStrokeColorSpace(Object args[], int numArgs);
+ void opSetFillColor(Object args[], int numArgs);
+ void opSetStrokeColor(Object args[], int numArgs);
+ void opSetFillColorN(Object args[], int numArgs);
+ void opSetStrokeColorN(Object args[], int numArgs);
+
+ // path segment operators
+ void opMoveTo(Object args[], int numArgs);
+ void opLineTo(Object args[], int numArgs);
+ void opCurveTo(Object args[], int numArgs);
+ void opCurveTo1(Object args[], int numArgs);
+ void opCurveTo2(Object args[], int numArgs);
+ void opRectangle(Object args[], int numArgs);
+ void opClosePath(Object args[], int numArgs);
+
+ // path painting operators
+ void opEndPath(Object args[], int numArgs);
+ void opStroke(Object args[], int numArgs);
+ void opCloseStroke(Object args[], int numArgs);
+ void opFill(Object args[], int numArgs);
+ void opEOFill(Object args[], int numArgs);
+ void opFillStroke(Object args[], int numArgs);
+ void opCloseFillStroke(Object args[], int numArgs);
+ void opEOFillStroke(Object args[], int numArgs);
+ void opCloseEOFillStroke(Object args[], int numArgs);
+ void doFillAndStroke(GBool eoFill);
+ void doPatternFillFallback(GBool eoFill);
+ void doPatternStrokeFallback();
+ void doShadingPatternFillFallback(GfxShadingPattern *sPat,
+ GBool stroke, GBool eoFill);
+ void opShFill(Object args[], int numArgs);
+ void doFunctionShFill(GfxFunctionShading *shading);
+ void doFunctionShFill1(GfxFunctionShading *shading,
+ double x0, double y0,
+ double x1, double y1,
+ GfxColor *colors, int depth);
+ void doGouraudTriangleShFill(GfxGouraudTriangleShading *shading);
+ void gouraudFillTriangle(double x0, double y0, GfxColor *color0,
+ double x1, double y1, GfxColor *color1,
+ double x2, double y2, GfxColor *color2,
+ int nComps, int depth);
+ void doPatchMeshShFill(GfxPatchMeshShading *shading);
+ void fillPatch(_POPPLER_CONST GfxPatch *patch, int nComps, int depth);
+ void doEndPath();
+
+ // path clipping operators
+ void opClip(Object args[], int numArgs);
+ void opEOClip(Object args[], int numArgs);
+
+ // text object operators
+ void opBeginText(Object args[], int numArgs);
+ void opEndText(Object args[], int numArgs);
+
+ // text state operators
+ void opSetCharSpacing(Object args[], int numArgs);
+ void opSetFont(Object args[], int numArgs);
+ void opSetTextLeading(Object args[], int numArgs);
+ void opSetTextRender(Object args[], int numArgs);
+ void opSetTextRise(Object args[], int numArgs);
+ void opSetWordSpacing(Object args[], int numArgs);
+ void opSetHorizScaling(Object args[], int numArgs);
+
+ // text positioning operators
+ void opTextMove(Object args[], int numArgs);
+ void opTextMoveSet(Object args[], int numArgs);
+ void opSetTextMatrix(Object args[], int numArgs);
+ void opTextNextLine(Object args[], int numArgs);
+
+ // text string operators
+ void opShowText(Object args[], int numArgs);
+ void opMoveShowText(Object args[], int numArgs);
+ void opMoveSetShowText(Object args[], int numArgs);
+ void opShowSpaceText(Object args[], int numArgs);
+#if POPPLER_CHECK_VERSION(0,64,0)
+ void doShowText(const GooString *s);
+#else
+ void doShowText(GooString *s);
+#endif
+
+
+ // XObject operators
+ void opXObject(Object args[], int numArgs);
+ void doImage(Object *ref, Stream *str, GBool inlineImg);
+ void doForm(Object *str);
+ void doForm1(Object *str, Dict *resDict, double *matrix, double *bbox,
+ GBool transpGroup = gFalse, GBool softMask = gFalse,
+ GfxColorSpace *blendingColorSpace = nullptr,
+ GBool isolated = gFalse, GBool knockout = gFalse,
+ GBool alpha = gFalse, Function *transferFunc = nullptr,
+ GfxColor *backdropColor = nullptr);
+
+ // in-line image operators
+ void opBeginImage(Object args[], int numArgs);
+ Stream *buildImageStream();
+ void opImageData(Object args[], int numArgs);
+ void opEndImage(Object args[], int numArgs);
+
+ // type 3 font operators
+ void opSetCharWidth(Object args[], int numArgs);
+ void opSetCacheDevice(Object args[], int numArgs);
+
+ // compatibility operators
+ void opBeginIgnoreUndef(Object args[], int numArgs);
+ void opEndIgnoreUndef(Object args[], int numArgs);
+
+ // marked content operators
+ void opBeginMarkedContent(Object args[], int numArgs);
+ void opEndMarkedContent(Object args[], int numArgs);
+ void opMarkPoint(Object args[], int numArgs);
+
+ void pushResources(Dict *resDict);
+ void popResources();
+};
+
+#endif /* HAVE_POPPLER */
+
+#endif /* PDF_PARSER_H */
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