gfx.cc

来自「source code: Covert TXT to PDF」· CC 代码 · 共 2,586 行 · 第 1/5 页

	for (i = 0; i < numArgs; ++i) {
	  printf(" ");
	  args[i].print(stdout);
	}
	printf("\n");
	fflush(stdout);
      }
      execOp(&obj, args, numArgs);
      obj.free();
      for (i = 0; i < numArgs; ++i)
	args[i].free();
      numArgs = 0;

      // periodically update display
      if (++updateLevel >= 20000) {
	out->dump();
	updateLevel = 0;
      }

      // check for an abort
      if (abortCheckCbk) {
	if (updateLevel - lastAbortCheck > 10) {
	  if ((*abortCheckCbk)(abortCheckCbkData)) {
	    break;
	  }
	  lastAbortCheck = updateLevel;
	}
      }

    // got an argument - save it
    } else if (numArgs < maxArgs) {
      args[numArgs++] = obj;

    // too many arguments - something is wrong
    } else {
      error(getPos(), "Too many args in content stream");
      if (printCommands) {
	printf("throwing away arg: ");
	obj.print(stdout);
	printf("\n");
	fflush(stdout);
      }
      obj.free();
    }

    // grab the next object
    parser->getObj(&obj);
  }
  obj.free();

  // args at end with no command
  if (numArgs > 0) {
    error(getPos(), "Leftover args in content stream");
    if (printCommands) {
      printf("%d leftovers:", numArgs);
      for (i = 0; i < numArgs; ++i) {
	printf(" ");
	args[i].print(stdout);
      }
      printf("\n");
      fflush(stdout);
    }
    for (i = 0; i < numArgs; ++i)
      args[i].free();
  }

  // update display
  if (topLevel && updateLevel > 0) {
    out->dump();
  }
}

void Gfx::execOp(Object *cmd, Object args[], int numArgs) {
  Operator *op;
  char *name;
  int i;

  // find operator
  name = cmd->getCmd();
  if (!(op = findOp(name))) {
    if (ignoreUndef == 0)
      error(getPos(), "Unknown operator '%s'", name);
    return;
  }

  // type check args
  if (op->numArgs >= 0) {
    if (numArgs != op->numArgs) {
      error(getPos(), "Wrong number (%d) of args to '%s' operator",
	    numArgs, name);
      return;
    }
  } else {
    if (numArgs > -op->numArgs) {
      error(getPos(), "Too many (%d) args to '%s' operator",
	    numArgs, name);
      return;
    }
  }
  for (i = 0; i < numArgs; ++i) {
    if (!checkArg(&args[i], op->tchk[i])) {
      error(getPos(), "Arg #%d to '%s' operator is wrong type (%s)",
	    i, name, args[i].getTypeName());
      return;
    }
  }

  // do it
  (this->*op->func)(args, numArgs);
}

Operator *Gfx::findOp(char *name) {
  int a, b, m, cmp;

  a = -1;
  b = numOps;
  // invariant: opTab[a] < name < opTab[b]
  while (b - a > 1) {
    m = (a + b) / 2;
    cmp = strcmp(opTab[m].name, name);
    if (cmp < 0)
      a = m;
    else if (cmp > 0)
      b = m;
    else
      a = b = m;
  }
  if (cmp != 0)
    return NULL;
  return &opTab[a];
}

GBool Gfx::checkArg(Object *arg, TchkType type) {
  switch (type) {
  case tchkBool:   return arg->isBool();
  case tchkInt:    return arg->isInt();
  case tchkNum:    return arg->isNum();
  case tchkString: return arg->isString();
  case tchkName:   return arg->isName();
  case tchkArray:  return arg->isArray();
  case tchkProps:  return arg->isDict() || arg->isName();
  case tchkSCN:    return arg->isNum() || arg->isName();
  case tchkNone:   return gFalse;
  }
  return gFalse;
}

int Gfx::getPos() {
  return parser ? parser->getPos() : -1;
}

//------------------------------------------------------------------------
// graphics state operators
//------------------------------------------------------------------------

void Gfx::opSave(Object args[], int numArgs) {
  out->saveState(state);
  state = state->save();
}

void Gfx::opRestore(Object args[], int numArgs) {
  state = state->restore();
  out->restoreState(state);
}

void Gfx::opConcat(Object args[], int numArgs) {
  state->concatCTM(args[0].getNum(), args[1].getNum(),
		   args[2].getNum(), args[3].getNum(),
		   args[4].getNum(), args[5].getNum());
  out->updateCTM(state, args[0].getNum(), args[1].getNum(),
		 args[2].getNum(), args[3].getNum(),
		 args[4].getNum(), args[5].getNum());
  fontChanged = gTrue;
}

void Gfx::opSetDash(Object args[], int numArgs) {
  Array *a;
  int length;
  Object obj;
  double *dash;
  int i;

  a = args[0].getArray();
  length = a->getLength();
  if (length == 0) {
    dash = NULL;
  } else {
    dash = (double *)gmalloc(length * sizeof(double));
    for (i = 0; i < length; ++i) {
      dash[i] = a->get(i, &obj)->getNum();
      obj.free();
    }
  }
  state->setLineDash(dash, length, args[1].getNum());
  out->updateLineDash(state);
}

void Gfx::opSetFlat(Object args[], int numArgs) {
  state->setFlatness((int)args[0].getNum());
  out->updateFlatness(state);
}

void Gfx::opSetLineJoin(Object args[], int numArgs) {
  state->setLineJoin(args[0].getInt());
  out->updateLineJoin(state);
}

void Gfx::opSetLineCap(Object args[], int numArgs) {
  state->setLineCap(args[0].getInt());
  out->updateLineCap(state);
}

void Gfx::opSetMiterLimit(Object args[], int numArgs) {
  state->setMiterLimit(args[0].getNum());
  out->updateMiterLimit(state);
}

void Gfx::opSetLineWidth(Object args[], int numArgs) {
  state->setLineWidth(args[0].getNum());
  out->updateLineWidth(state);
}

void Gfx::opSetExtGState(Object args[], int numArgs) {
  Object obj1, obj2;

  if (!res->lookupGState(args[0].getName(), &obj1)) {
    return;
  }
  if (!obj1.isDict()) {
    error(getPos(), "ExtGState '%s' is wrong type", args[0].getName());
    obj1.free();
    return;
  }
  if (obj1.dictLookup("ca", &obj2)->isNum()) {
    state->setFillOpacity(obj2.getNum());
    out->updateFillOpacity(state);
  }
  obj2.free();
  if (obj1.dictLookup("CA", &obj2)->isNum()) {
    state->setStrokeOpacity(obj2.getNum());
    out->updateStrokeOpacity(state);
  }
  obj2.free();
  obj1.free();
}

void Gfx::opSetRenderingIntent(Object args[], int numArgs) {
}

//------------------------------------------------------------------------
// color operators
//------------------------------------------------------------------------

void Gfx::opSetFillGray(Object args[], int numArgs) {
  GfxColor color;

  state->setFillPattern(NULL);
  state->setFillColorSpace(new GfxDeviceGrayColorSpace());
  color.c[0] = args[0].getNum();
  state->setFillColor(&color);
  out->updateFillColor(state);
}

void Gfx::opSetStrokeGray(Object args[], int numArgs) {
  GfxColor color;

  state->setStrokePattern(NULL);
  state->setStrokeColorSpace(new GfxDeviceGrayColorSpace());
  color.c[0] = args[0].getNum();
  state->setStrokeColor(&color);
  out->updateStrokeColor(state);
}

void Gfx::opSetFillCMYKColor(Object args[], int numArgs) {
  GfxColor color;
  int i;

  state->setFillPattern(NULL);
  state->setFillColorSpace(new GfxDeviceCMYKColorSpace());
  for (i = 0; i < 4; ++i) {
    color.c[i] = args[i].getNum();
  }
  state->setFillColor(&color);
  out->updateFillColor(state);
}

void Gfx::opSetStrokeCMYKColor(Object args[], int numArgs) {
  GfxColor color;
  int i;

  state->setStrokePattern(NULL);
  state->setStrokeColorSpace(new GfxDeviceCMYKColorSpace());
  for (i = 0; i < 4; ++i) {
    color.c[i] = args[i].getNum();
  }
  state->setStrokeColor(&color);
  out->updateStrokeColor(state);
}

void Gfx::opSetFillRGBColor(Object args[], int numArgs) {
  GfxColor color;
  int i;

  state->setFillPattern(NULL);
  state->setFillColorSpace(new GfxDeviceRGBColorSpace());
  for (i = 0; i < 3; ++i) {
    color.c[i] = args[i].getNum();
  }
  state->setFillColor(&color);
  out->updateFillColor(state);
}

void Gfx::opSetStrokeRGBColor(Object args[], int numArgs) {
  GfxColor color;
  int i;

  state->setStrokePattern(NULL);
  state->setStrokeColorSpace(new GfxDeviceRGBColorSpace());
  for (i = 0; i < 3; ++i) {
    color.c[i] = args[i].getNum();
  }
  state->setStrokeColor(&color);
  out->updateStrokeColor(state);
}

void Gfx::opSetFillColorSpace(Object args[], int numArgs) {
  Object obj;
  GfxColorSpace *colorSpace;
  GfxColor color;
  int i;

  state->setFillPattern(NULL);
  res->lookupColorSpace(args[0].getName(), &obj);
  if (obj.isNull()) {
    colorSpace = GfxColorSpace::parse(&args[0]);
  } else {
    colorSpace = GfxColorSpace::parse(&obj);
  }
  obj.free();
  if (colorSpace) {
    state->setFillColorSpace(colorSpace);
  } else {
    error(getPos(), "Bad color space (fill)");
  }
  for (i = 0; i < gfxColorMaxComps; ++i) {
    color.c[i] = 0;
  }
  state->setFillColor(&color);
  out->updateFillColor(state);
}

void Gfx::opSetStrokeColorSpace(Object args[], int numArgs) {
  Object obj;
  GfxColorSpace *colorSpace;
  GfxColor color;
  int i;

  state->setStrokePattern(NULL);
  res->lookupColorSpace(args[0].getName(), &obj);
  if (obj.isNull()) {
    colorSpace = GfxColorSpace::parse(&args[0]);
  } else {
    colorSpace = GfxColorSpace::parse(&obj);
  }
  obj.free();
  if (colorSpace) {
    state->setStrokeColorSpace(colorSpace);
  } else {
    error(getPos(), "Bad color space (stroke)");
  }
  for (i = 0; i < gfxColorMaxComps; ++i) {
    color.c[i] = 0;
  }
  state->setStrokeColor(&color);
  out->updateStrokeColor(state);
}

void Gfx::opSetFillColor(Object args[], int numArgs) {
  GfxColor color;
  int i;

  state->setFillPattern(NULL);
  for (i = 0; i < numArgs; ++i) {
    color.c[i] = args[i].getNum();
  }
  state->setFillColor(&color);
  out->updateFillColor(state);
}

void Gfx::opSetStrokeColor(Object args[], int numArgs) {
  GfxColor color;
  int i;

  state->setStrokePattern(NULL);
  for (i = 0; i < numArgs; ++i) {
    color.c[i] = args[i].getNum();
  }
  state->setStrokeColor(&color);
  out->updateStrokeColor(state);
}

void Gfx::opSetFillColorN(Object args[], int numArgs) {
  GfxColor color;
  GfxPattern *pattern;
  int i;

  if (state->getFillColorSpace()->getMode() == csPattern) {
    if (numArgs > 1) {
      for (i = 0; i < numArgs && i < 4; ++i) {
	if (args[i].isNum()) {
	  color.c[i] = args[i].getNum();
	}
      }
      state->setFillColor(&color);
      out->updateFillColor(state);
    }
    if (args[numArgs-1].isName() &&
	(pattern = res->lookupPattern(args[numArgs-1].getName()))) {
      state->setFillPattern(pattern);
    }

  } else {
    state->setFillPattern(NULL);
    for (i = 0; i < numArgs && i < 4; ++i) {
      if (args[i].isNum()) {
	color.c[i] = args[i].getNum();
      }
    }
    state->setFillColor(&color);
    out->updateFillColor(state);
  }
}

void Gfx::opSetStrokeColorN(Object args[], int numArgs) {
  GfxColor color;
  GfxPattern *pattern;
  int i;

  if (state->getStrokeColorSpace()->getMode() == csPattern) {
    if (numArgs > 1) {
      for (i = 0; i < numArgs && i < 4; ++i) {
	if (args[i].isNum()) {
	  color.c[i] = args[i].getNum();
	}
      }
      state->setStrokeColor(&color);
      out->updateStrokeColor(state);
    }
    if (args[numArgs-1].isName() &&
	(pattern = res->lookupPattern(args[numArgs-1].getName()))) {
      state->setStrokePattern(pattern);
    }

  } else {
    state->setStrokePattern(NULL);
    for (i = 0; i < numArgs && i < 4; ++i) {
      if (args[i].isNum()) {
	color.c[i] = args[i].getNum();
      }
    }
    state->setStrokeColor(&color);
    out->updateStrokeColor(state);
  }
}

//------------------------------------------------------------------------
// path segment operators
//------------------------------------------------------------------------

void Gfx::opMoveTo(Object args[], int numArgs) {
  state->moveTo(args[0].getNum(), args[1].getNum());
}

void Gfx::opLineTo(Object args[], int numArgs) {
  if (!state->isCurPt()) {
    error(getPos(), "No current point in lineto");
    return;
  }
  state->lineTo(args[0].getNum(), args[1].getNum());
}

void Gfx::opCurveTo(Object args[], int numArgs) {
  double x1, y1, x2, y2, x3, y3;

  if (!state->isCurPt()) {
    error(getPos(), "No current point in curveto");
    return;
  }
  x1 = args[0].getNum();
  y1 = args[1].getNum();
  x2 = args[2].getNum();
  y2 = args[3].getNum();
  x3 = args[4].getNum();
  y3 = args[5].getNum();
  state->curveTo(x1, y1, x2, y2, x3, y3);
}

void Gfx::opCurveTo1(Object args[], int numArgs) {
  double x1, y1, x2, y2, x3, y3;

  if (!state->isCurPt()) {
    error(getPos(), "No current point in curveto1");
    return;
  }
  x1 = state->getCurX();
  y1 = state->getCurY();
  x2 = args[0].getNum();
  y2 = args[1].getNum();
  x3 = args[2].getNum();
  y3 = args[3].getNum();
  state->curveTo(x1, y1, x2, y2, x3, y3);
}

void Gfx::opCurveTo2(Object args[], int numArgs) {
  double x1, y1, x2, y2, x3, y3;

  if (!state->isCurPt()) {
    error(getPos(), "No current point in curveto2");