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pdf-parser.h

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 /** \file
 * PDF parsing module using libpoppler's facilities
 *
 * Derived from Gfx.h
 *
 * Copyright 1996-2003 Glyph & Cog, LLC
 *
 */

#ifndef PDF_PARSER_H
#define PDF_PARSER_H

#ifdef HAVE_POPPLER

#ifdef USE_GCC_PRAGMAS
#pragma interface
#endif

namespace Inkscape {
    namespace Extension {
        namespace Internal {
                class SvgBuilder;
        }
    }
}
using Inkscape::Extension::Internal::SvgBuilder;

#include "goo/gtypes.h"
#include "Object.h"

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;

//------------------------------------------------------------------------

#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
};

//------------------------------------------------------------------------
// ClipHistoryEntry
//------------------------------------------------------------------------

class ClipHistoryEntry {
public:

    ClipHistoryEntry(GfxPath *clipPath=NULL, GfxClipType clipType=clipNormal);
    virtual ~ClipHistoryEntry();

    // Manipulate clip path stack
    ClipHistoryEntry *save();
    ClipHistoryEntry *restore();
    GBool hasSaves() { return saved != NULL; }
    void setClip(GfxPath *newClipPath, GfxClipType newClipType=clipNormal);
    GfxPath *getClipPath() { return clipPath; }
    GfxClipType getClipType() { return clipType; }

private:

    ClipHistoryEntry *saved;    // next clip path on stack
        
    GfxPath *clipPath;        // used as the path to be filled for an 'sh' operator
    GfxClipType clipType;

    ClipHistoryEntry(ClipHistoryEntry *other);
};

//------------------------------------------------------------------------
// PdfParser
//------------------------------------------------------------------------

//------------------------------------------------------------------------
// constants
//------------------------------------------------------------------------

#define pdfFunctionShading  1
#define pdfAxialShading     2
#define pdfRadialShading    3
#define pdfGouraudTriangleShading  4
#define pdfPatchMeshShading 5
#define pdfNumShadingTypes 5


class PdfParser {
public:

  // Constructor for regular output.
  PdfParser(XRef *xrefA, SvgBuilder *builderA, int pageNum, int rotate,
            Dict *resDict, PDFRectangle *box, PDFRectangle *cropBox);

  // Constructor for a sub-page object.
  PdfParser(XRef *xrefA, Inkscape::Extension::Internal::SvgBuilder *builderA,
            Dict *resDict, 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

  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(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(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);
  void doShowText(GooString *s);

  // 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 = NULL,
             GBool isolated = gFalse, GBool knockout = gFalse,
             GBool alpha = gFalse, Function *transferFunc = NULL,
             GfxColor *backdropColor = NULL);

  // 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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