xpdf-4.04.tar.gz: xpdf-4.04/xpdf/Gfx.h

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1 //======================================================================== 2 // 3 // Gfx.h 4 // 5 // Copyright 1996-2016 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 #include "gfile.h" 20 #include "GfxState.h" 21 22 class GString; 23 class GList; 24 class PDFDoc; 25 class XRef; 26 class Array; 27 class Stream; 28 class Parser; 29 class Dict; 30 class Function; 31 class OutputDev; 32 class GfxFontDict; 33 class GfxFont; 34 class Gfx; 35 class PDFRectangle; 36 class AnnotBorderStyle; 37 38 //------------------------------------------------------------------------ 39 40 enum GfxClipType { 41 clipNone, 42 clipNormal, 43 clipEO 44 }; 45 46 enum TchkType { 47 tchkBool, // boolean 48 tchkInt, // integer 49 tchkNum, // number (integer or real) 50 tchkString, // string 51 tchkName, // name 52 tchkArray, // array 53 tchkProps, // properties (dictionary or name) 54 tchkSCN, // scn/SCN args (number of name) 55 tchkNone // used to avoid empty initializer lists 56 }; 57 58 #define maxArgs 33 59 60 struct Operator { 61 char name[4]; 62 int numArgs; 63 TchkType tchk[maxArgs]; 64 void (Gfx::*func)(Object args[], int numArgs); 65 }; 66 67 //------------------------------------------------------------------------ 68 69 class GfxResources { 70 public: 71 72 GfxResources(XRef *xref, Dict *resDict, GfxResources *nextA); 73 ~GfxResources(); 74 75 GfxFont *lookupFont(char *name); 76 GfxFont *lookupFontByRef(Ref ref); 77 GBool lookupXObject(const char *name, Object *obj); 78 GBool lookupXObjectNF(const char *name, Object *obj); 79 void lookupColorSpace(const char *name, Object *obj, GBool inherit = gTrue); 80 GfxPattern *lookupPattern(const char *name 81 ); 82 GfxShading *lookupShading(const char *name 83 ); 84 GBool lookupGState(const char *name, Object *obj); 85 GBool lookupPropertiesNF(const char *name, Object *obj); 86 87 GfxResources *getNext() { return next; } 88 89 private: 90 91 GBool valid; 92 GfxFontDict *fonts; 93 Object xObjDict; 94 Object colorSpaceDict; 95 Object patternDict; 96 Object shadingDict; 97 Object gStateDict; 98 Object propsDict; 99 GfxResources *next; 100 }; 101 102 //------------------------------------------------------------------------ 103 // GfxMarkedContent 104 //------------------------------------------------------------------------ 105 106 enum GfxMarkedContentKind { 107 gfxMCOptionalContent, 108 gfxMCActualText, 109 gfxMCOther 110 }; 111 112 class GfxMarkedContent { 113 public: 114 115 GfxMarkedContent(GfxMarkedContentKind kindA, GBool ocStateA) { 116 kind = kindA; 117 ocState = ocStateA; 118 } 119 ~GfxMarkedContent() {} 120 121 GfxMarkedContentKind kind; 122 GBool ocState; // true if drawing is enabled, false if 123 // disabled 124 }; 125 126 //------------------------------------------------------------------------ 127 // Gfx 128 //------------------------------------------------------------------------ 129 130 class Gfx { 131 public: 132 133 // Constructor for regular output. 134 Gfx(PDFDoc *docA, OutputDev *outA, int pageNum, Dict *resDict, 135 double hDPI, double vDPI, PDFRectangle *box, 136 PDFRectangle *cropBox, int rotate, 137 GBool (*abortCheckCbkA)(void *data) = NULL, 138 void *abortCheckCbkDataA = NULL); 139 140 // Constructor for a sub-page object. 141 Gfx(PDFDoc *docA, OutputDev *outA, Dict *resDict, 142 PDFRectangle *box, PDFRectangle *cropBox, 143 GBool (*abortCheckCbkA)(void *data) = NULL, 144 void *abortCheckCbkDataA = NULL); 145 146 ~Gfx(); 147 148 // Interpret a stream or array of streams. <objRef> should be a 149 // reference wherever possible (for loop-checking). 150 void display(Object *objRef, GBool topLevel = gTrue); 151 152 // Display an annotation, given its appearance (a Form XObject), 153 // border style, and bounding box (in default user space). 154 void drawAnnot(Object *strRef, AnnotBorderStyle *borderStyle, 155 double xMin, double yMin, double xMax, double yMax); 156 157 // Save graphics state. 158 void saveState(); 159 160 // Restore graphics state. 161 void restoreState(); 162 163 // Get the current graphics state object. 164 GfxState *getState() { return state; } 165 166 void drawForm(Object *strRef, Dict *resDict, double *matrix, double *bbox, 167 GBool transpGroup = gFalse, GBool softMask = gFalse, 168 GBool isolated = gFalse, GBool knockout = gFalse, 169 GBool alpha = gFalse, Function *transferFunc = NULL, 170 Object *backdropColorObj = NULL); 171 172 // Take all of the content stream stack entries from <oldGfx>. This 173 // is useful when creating a new Gfx object to handle a pattern, 174 // etc., where it's useful to check for loops that span both Gfx 175 // objects. This function should be called immediately after the 176 // Gfx constructor, i.e., before processing any content streams with 177 // the new Gfx object. 178 void takeContentStreamStack(Gfx *oldGfx); 179 180 // Clear the state stack and the marked content stack. 181 void endOfPage(); 182 183 private: 184 185 PDFDoc *doc; 186 XRef *xref; // the xref table for this PDF file 187 OutputDev *out; // output device 188 GBool subPage; // is this a sub-page object? 189 GBool printCommands; // print the drawing commands (for debugging) 190 GfxResources *res; // resource stack 191 GfxFont *defaultFont; // font substituted for undefined fonts 192 int opCounter; // operation counter (used to decide when 193 // to check for an abort) 194 195 GfxState *state; // current graphics state 196 GBool fontChanged; // set if font or text matrix has changed 197 GfxClipType clip; // do a clip? 198 int ignoreUndef; // current BX/EX nesting level 199 double baseMatrix[6]; // default matrix for most recent 200 // page/form/pattern 201 int formDepth; 202 GBool ocState; // true if drawing is enabled, false if 203 // disabled 204 GList *markedContentStack; // BMC/BDC/EMC stack [GfxMarkedContent] 205 206 Parser *parser; // parser for page content stream(s) 207 GList *contentStreamStack; // stack of open content streams, used 208 // for loop-checking 209 210 GBool // callback to check for an abort 211 (*abortCheckCbk)(void *data); 212 void *abortCheckCbkData; 213 214 static Operator opTab[]; // table of operators 215 216 GBool checkForContentStreamLoop(Object *ref); 217 void go(GBool topLevel); 218 void getContentObj(Object *obj); 219 GBool execOp(Object *cmd, Object args[], int numArgs); 220 Operator *findOp(char *name); 221 GBool checkArg(Object *arg, TchkType type); 222 GFileOffset getPos(); 223 224 // graphics state operators 225 void opSave(Object args[], int numArgs); 226 void opRestore(Object args[], int numArgs); 227 void opConcat(Object args[], int numArgs); 228 void opSetDash(Object args[], int numArgs); 229 void opSetFlat(Object args[], int numArgs); 230 void opSetLineJoin(Object args[], int numArgs); 231 void opSetLineCap(Object args[], int numArgs); 232 void opSetMiterLimit(Object args[], int numArgs); 233 void opSetLineWidth(Object args[], int numArgs); 234 void opSetExtGState(Object args[], int numArgs); 235 void doSoftMask(Object *str, Object *strRef, GBool alpha, 236 GBool isolated, GBool knockout, 237 Function *transferFunc, Object *backdropColorObj); 238 void opSetRenderingIntent(Object args[], int numArgs); 239 GfxRenderingIntent parseRenderingIntent(const char *name); 240 241 // color operators 242 void opSetFillGray(Object args[], int numArgs); 243 void opSetStrokeGray(Object args[], int numArgs); 244 void opSetFillCMYKColor(Object args[], int numArgs); 245 void opSetStrokeCMYKColor(Object args[], int numArgs); 246 void opSetFillRGBColor(Object args[], int numArgs); 247 void opSetStrokeRGBColor(Object args[], int numArgs); 248 void opSetFillColorSpace(Object args[], int numArgs); 249 void opSetStrokeColorSpace(Object args[], int numArgs); 250 void opSetFillColor(Object args[], int numArgs); 251 void opSetStrokeColor(Object args[], int numArgs); 252 void opSetFillColorN(Object args[], int numArgs); 253 void opSetStrokeColorN(Object args[], int numArgs); 254 255 // path segment operators 256 void opMoveTo(Object args[], int numArgs); 257 void opLineTo(Object args[], int numArgs); 258 void opCurveTo(Object args[], int numArgs); 259 void opCurveTo1(Object args[], int numArgs); 260 void opCurveTo2(Object args[], int numArgs); 261 void opRectangle(Object args[], int numArgs); 262 void opClosePath(Object args[], int numArgs); 263 264 // path painting operators 265 void opEndPath(Object args[], int numArgs); 266 void opStroke(Object args[], int numArgs); 267 void opCloseStroke(Object args[], int numArgs); 268 void opFill(Object args[], int numArgs); 269 void opEOFill(Object args[], int numArgs); 270 void opFillStroke(Object args[], int numArgs); 271 void opCloseFillStroke(Object args[], int numArgs); 272 void opEOFillStroke(Object args[], int numArgs); 273 void opCloseEOFillStroke(Object args[], int numArgs); 274 void doPatternFill(GBool eoFill); 275 void doPatternStroke(); 276 void doPatternText(); 277 void doPatternImageMask(Object *ref, Stream *str, int width, int height, 278 GBool invert, GBool inlineImg, GBool interpolate); 279 void doTilingPatternFill(GfxTilingPattern *tPat, 280 GBool stroke, GBool eoFill, GBool text); 281 void doShadingPatternFill(GfxShadingPattern *sPat, 282 GBool stroke, GBool eoFill, GBool text); 283 void opShFill(Object args[], int numArgs); 284 void doShFill(GfxShading *shading); 285 void doFunctionShFill(GfxFunctionShading *shading); 286 void doFunctionShFill1(GfxFunctionShading *shading, 287 double x0, double y0, 288 double x1, double y1, 289 GfxColor *colors, int depth); 290 void doAxialShFill(GfxAxialShading *shading); 291 void doRadialShFill(GfxRadialShading *shading); 292 void doGouraudTriangleShFill(GfxGouraudTriangleShading *shading); 293 void gouraudFillTriangle(double x0, double y0, double *color0, 294 double x1, double y1, double *color1, 295 double x2, double y2, double *color2, 296 GfxGouraudTriangleShading *shading, int depth); 297 void doPatchMeshShFill(GfxPatchMeshShading *shading); 298 void fillPatch(GfxPatch *patch, GfxPatchMeshShading *shading, int depth); 299 void doEndPath(); 300 301 // path clipping operators 302 void opClip(Object args[], int numArgs); 303 void opEOClip(Object args[], int numArgs); 304 305 // text object operators 306 void opBeginText(Object args[], int numArgs); 307 void opEndText(Object args[], int numArgs); 308 309 // text state operators 310 void opSetCharSpacing(Object args[], int numArgs); 311 void opSetFont(Object args[], int numArgs); 312 void doSetFont(GfxFont *font, double size); 313 void opSetTextLeading(Object args[], int numArgs); 314 void opSetTextRender(Object args[], int numArgs); 315 void opSetTextRise(Object args[], int numArgs); 316 void opSetWordSpacing(Object args[], int numArgs); 317 void opSetHorizScaling(Object args[], int numArgs); 318 319 // text positioning operators 320 void opTextMove(Object args[], int numArgs); 321 void opTextMoveSet(Object args[], int numArgs); 322 void opSetTextMatrix(Object args[], int numArgs); 323 void opTextNextLine(Object args[], int numArgs); 324 325 // text string operators 326 void opShowText(Object args[], int numArgs); 327 void opMoveShowText(Object args[], int numArgs); 328 void opMoveSetShowText(Object args[], int numArgs); 329 void opShowSpaceText(Object args[], int numArgs); 330 void doShowText(GString *s); 331 void doIncCharCount(GString *s); 332 333 // XObject operators 334 void opXObject(Object args[], int numArgs); 335 GBool doImage(Object *ref, Stream *str, GBool inlineImg); 336 void doForm(Object *strRef, Object *str); 337 338 // in-line image operators 339 void opBeginImage(Object args[], int numArgs); 340 Stream *buildImageStream(GBool *haveLength); 341 void opImageData(Object args[], int numArgs); 342 void opEndImage(Object args[], int numArgs); 343 344 // type 3 font operators 345 void opSetCharWidth(Object args[], int numArgs); 346 void opSetCacheDevice(Object args[], int numArgs); 347 348 // compatibility operators 349 void opBeginIgnoreUndef(Object args[], int numArgs); 350 void opEndIgnoreUndef(Object args[], int numArgs); 351 352 // marked content operators 353 void opBeginMarkedContent(Object args[], int numArgs); 354 void opEndMarkedContent(Object args[], int numArgs); 355 void opMarkPoint(Object args[], int numArgs); 356 357 GfxState *saveStateStack(); 358 void restoreStateStack(GfxState *oldState); 359 void pushResources(Dict *resDict); 360 void popResources(); 361 }; 362 363 #endif