pdf2swf/xpdf/Gfx.h

   1 //========================================================================
   2 //
   3 // Gfx.h
   4 //
   5 // Copyright 1996-2003 Glyph & Cog, LLC
   6 //
   7 //========================================================================
   8
   9 #ifndef GFX_H
  10 #define GFX_H
  11
  12 #include <aconf.h>
  13
  14 #ifdef USE_GCC_PRAGMAS
  15 #pragma interface
  16 #endif
  17
  18 #include "gtypes.h"
  19
  20 class GString;
  21 class XRef;
  22 class Array;
  23 class Stream;
  24 class Parser;
  25 class Dict;
  26 class OutputDev;
  27 class GfxFontDict;
  28 class GfxFont;
  29 class GfxPattern;
  30 class GfxTilingPattern;
  31 class GfxShadingPattern;
  32 class GfxShading;
  33 class GfxFunctionShading;
  34 class GfxAxialShading;
  35 class GfxRadialShading;
  36 class GfxState;
  37 struct GfxColor;
  38 class Gfx;
  39 class PDFRectangle;
  40
  41 //------------------------------------------------------------------------
  42 // Gfx
  43 //------------------------------------------------------------------------
  44
  45 enum GfxClipType {
  46   clipNone,
  47   clipNormal,
  48   clipEO
  49 };
  50
  51 enum TchkType {
  52   tchkBool,                     // boolean
  53   tchkInt,                      // integer
  54   tchkNum,                      // number (integer or real)
  55   tchkString,                   // string
  56   tchkName,                     // name
  57   tchkArray,                    // array
  58   tchkProps,                    // properties (dictionary or name)
  59   tchkSCN,                      // scn/SCN args (number of name)
  60   tchkNone                      // used to avoid empty initializer lists
  61 };
  62
  63 #define maxArgs 8
  64
  65 struct Operator {
  66   char name[4];
  67   int numArgs;
  68   TchkType tchk[maxArgs];
  69   void (Gfx::*func)(Object args[], int numArgs);
  70 };
  71
  72 class GfxResources {
  73 public:
  74
  75   GfxResources(XRef *xref, Dict *resDict, GfxResources *nextA);
  76   ~GfxResources();
  77
  78   GfxFont *lookupFont(char *name);
  79   GBool lookupXObject(char *name, Object *obj);
  80   GBool lookupXObjectNF(char *name, Object *obj);
  81   void lookupColorSpace(char *name, Object *obj);
  82   GfxPattern *lookupPattern(char *name);
  83   GfxShading *lookupShading(char *name);
  84   GBool lookupGState(char *name, Object *obj);
  85
  86   GfxResources *getNext() { return next; }
  87
  88 private:
  89
  90   GfxFontDict *fonts;
  91   Object xObjDict;
  92   Object colorSpaceDict;
  93   Object patternDict;
  94   Object shadingDict;
  95   Object gStateDict;
  96   GfxResources *next;
  97 };
  98
  99 class Gfx {
 100 public:
 101
 102   // Constructor for regular output.
 103   Gfx(XRef *xrefA, OutputDev *outA, int pageNum, Dict *resDict,
 104       double hDPI, double vDPI, PDFRectangle *box, GBool crop,
 105       PDFRectangle *cropBox, int rotate,
 106       GBool (*abortCheckCbkA)(void *data) = NULL,
 107       void *abortCheckCbkDataA = NULL);
 108
 109   // Constructor for a sub-page object.
 110   Gfx(XRef *xrefA, OutputDev *outA, Dict *resDict,
 111       PDFRectangle *box, GBool crop, PDFRectangle *cropBox,
 112       GBool (*abortCheckCbkA)(void *data) = NULL,
 113       void *abortCheckCbkDataA = NULL);
 114
 115   ~Gfx();
 116
 117   // Interpret a stream or array of streams.
 118   void display(Object *obj, GBool topLevel = gTrue);
 119
 120   // Display an annotation, given its appearance (a Form XObject) and
 121   // bounding box (in default user space).
 122   void doAnnot(Object *str, double xMin, double yMin,
 123                double xMax, double yMax);
 124
 125   // Save graphics state.
 126   void saveState();
 127
 128   // Restore graphics state.
 129   void restoreState();
 130
 131 private:
 132
 133   XRef *xref;                   // the xref table for this PDF file
 134   OutputDev *out;               // output device
 135   GBool subPage;                // is this a sub-page object?
 136   GBool printCommands;          // print the drawing commands (for debugging)
 137   GfxResources *res;            // resource stack
 138   int updateLevel;
 139
 140   GfxState *state;              // current graphics state
 141   GBool fontChanged;            // set if font or text matrix has changed
 142   GfxClipType clip;             // do a clip?
 143   int ignoreUndef;              // current BX/EX nesting level
 144   double baseMatrix[6];         // default matrix for most recent
 145                                 //   page/form/pattern
 146   int formDepth;
 147
 148   Parser *parser;               // parser for page content stream(s)
 149
 150   GBool                         // callback to check for an abort
 151     (*abortCheckCbk)(void *data);
 152   void *abortCheckCbkData;
 153
 154   static Operator opTab[];      // table of operators
 155
 156   void go(GBool topLevel);
 157   void execOp(Object *cmd, Object args[], int numArgs);
 158   Operator *findOp(char *name);
 159   GBool checkArg(Object *arg, TchkType type);
 160   int getPos();
 161
 162   // graphics state operators
 163   void opSave(Object args[], int numArgs);
 164   void opRestore(Object args[], int numArgs);
 165   void opConcat(Object args[], int numArgs);
 166   void opSetDash(Object args[], int numArgs);
 167   void opSetFlat(Object args[], int numArgs);
 168   void opSetLineJoin(Object args[], int numArgs);
 169   void opSetLineCap(Object args[], int numArgs);
 170   void opSetMiterLimit(Object args[], int numArgs);
 171   void opSetLineWidth(Object args[], int numArgs);
 172   void opSetExtGState(Object args[], int numArgs);
 173   void opSetRenderingIntent(Object args[], int numArgs);
 174
 175   // color operators
 176   void opSetFillGray(Object args[], int numArgs);
 177   void opSetStrokeGray(Object args[], int numArgs);
 178   void opSetFillCMYKColor(Object args[], int numArgs);
 179   void opSetStrokeCMYKColor(Object args[], int numArgs);
 180   void opSetFillRGBColor(Object args[], int numArgs);
 181   void opSetStrokeRGBColor(Object args[], int numArgs);
 182   void opSetFillColorSpace(Object args[], int numArgs);
 183   void opSetStrokeColorSpace(Object args[], int numArgs);
 184   void opSetFillColor(Object args[], int numArgs);
 185   void opSetStrokeColor(Object args[], int numArgs);
 186   void opSetFillColorN(Object args[], int numArgs);
 187   void opSetStrokeColorN(Object args[], int numArgs);
 188
 189   // path segment operators
 190   void opMoveTo(Object args[], int numArgs);
 191   void opLineTo(Object args[], int numArgs);
 192   void opCurveTo(Object args[], int numArgs);
 193   void opCurveTo1(Object args[], int numArgs);
 194   void opCurveTo2(Object args[], int numArgs);
 195   void opRectangle(Object args[], int numArgs);
 196   void opClosePath(Object args[], int numArgs);
 197
 198   // path painting operators
 199   void opEndPath(Object args[], int numArgs);
 200   void opStroke(Object args[], int numArgs);
 201   void opCloseStroke(Object args[], int numArgs);
 202   void opFill(Object args[], int numArgs);
 203   void opEOFill(Object args[], int numArgs);
 204   void opFillStroke(Object args[], int numArgs);
 205   void opCloseFillStroke(Object args[], int numArgs);
 206   void opEOFillStroke(Object args[], int numArgs);
 207   void opCloseEOFillStroke(Object args[], int numArgs);
 208   void doPatternFill(GBool eoFill);
 209   void doTilingPatternFill(GfxTilingPattern *tPat, GBool eoFill);
 210   void doShadingPatternFill(GfxShadingPattern *sPat, GBool eoFill);
 211   void opShFill(Object args[], int numArgs);
 212   void doFunctionShFill(GfxFunctionShading *shading);
 213   void doFunctionShFill1(GfxFunctionShading *shading,
 214                          double x0, double y0,
 215                          double x1, double y1,
 216                          GfxColor *colors, int depth);
 217   void doAxialShFill(GfxAxialShading *shading);
 218   void doRadialShFill(GfxRadialShading *shading);
 219   void doEndPath();
 220
 221   // path clipping operators
 222   void opClip(Object args[], int numArgs);
 223   void opEOClip(Object args[], int numArgs);
 224
 225   // text object operators
 226   void opBeginText(Object args[], int numArgs);
 227   void opEndText(Object args[], int numArgs);
 228
 229   // text state operators
 230   void opSetCharSpacing(Object args[], int numArgs);
 231   void opSetFont(Object args[], int numArgs);
 232   void opSetTextLeading(Object args[], int numArgs);
 233   void opSetTextRender(Object args[], int numArgs);
 234   void opSetTextRise(Object args[], int numArgs);
 235   void opSetWordSpacing(Object args[], int numArgs);
 236   void opSetHorizScaling(Object args[], int numArgs);
 237
 238   // text positioning operators
 239   void opTextMove(Object args[], int numArgs);
 240   void opTextMoveSet(Object args[], int numArgs);
 241   void opSetTextMatrix(Object args[], int numArgs);
 242   void opTextNextLine(Object args[], int numArgs);
 243
 244   // text string operators
 245   void opShowText(Object args[], int numArgs);
 246   void opMoveShowText(Object args[], int numArgs);
 247   void opMoveSetShowText(Object args[], int numArgs);
 248   void opShowSpaceText(Object args[], int numArgs);
 249   void doShowText(GString *s);
 250
 251   // XObject operators
 252   void opXObject(Object args[], int numArgs);
 253   void doImage(Object *ref, Stream *str, GBool inlineImg);
 254   void doForm(Object *str);
 255   void doForm1(Object *str, Dict *resDict, double *matrix, double *bbox);
 256
 257   // in-line image operators
 258   void opBeginImage(Object args[], int numArgs);
 259   Stream *buildImageStream();
 260   void opImageData(Object args[], int numArgs);
 261   void opEndImage(Object args[], int numArgs);
 262
 263   // type 3 font operators
 264   void opSetCharWidth(Object args[], int numArgs);
 265   void opSetCacheDevice(Object args[], int numArgs);
 266
 267   // compatibility operators
 268   void opBeginIgnoreUndef(Object args[], int numArgs);
 269   void opEndIgnoreUndef(Object args[], int numArgs);
 270
 271   // marked content operators
 272   void opBeginMarkedContent(Object args[], int numArgs);
 273   void opEndMarkedContent(Object args[], int numArgs);
 274   void opMarkPoint(Object args[], int numArgs);
 275
 276   void pushResources(Dict *resDict);
 277   void popResources();
 278 };
 279
 280 #endif