gfxstate.cc

source code: Covert TXT to PDF

      color.c[i] = lookup[x[i] * nComps + i];
    }
    colorSpace->getRGB(&color, rgb);
  }
}

void GfxImageColorMap::getCMYK(Guchar *x, GfxCMYK *cmyk) {
  GfxColor color;
  double *p;
  int i;

  if (colorSpace2) {
    p = &lookup[x[0] * nComps2];
    for (i = 0; i < nComps2; ++i) {
      color.c[i] = *p++;
    }
    colorSpace2->getCMYK(&color, cmyk);
  } else {
    for (i = 0; i < nComps; ++i) {
      color.c[i] = lookup[x[i] * nComps + i];
    }
    colorSpace->getCMYK(&color, cmyk);
  }
}

void GfxImageColorMap::getColor(Guchar *x, GfxColor *color) {
  int maxPixel, i;

  maxPixel = (1 << bits) - 1;
  for (i = 0; i < nComps; ++i) {
    color->c[i] = decodeLow[i] + (x[i] * decodeRange[i]) / maxPixel;
  }
}

//------------------------------------------------------------------------
// GfxSubpath and GfxPath
//------------------------------------------------------------------------

GfxSubpath::GfxSubpath(double x1, double y1) {
  size = 16;
  x = (double *)gmalloc(size * sizeof(double));
  y = (double *)gmalloc(size * sizeof(double));
  curve = (GBool *)gmalloc(size * sizeof(GBool));
  n = 1;
  x[0] = x1;
  y[0] = y1;
  curve[0] = gFalse;
  closed = gFalse;
}

GfxSubpath::~GfxSubpath() {
  gfree(x);
  gfree(y);
  gfree(curve);
}

// Used for copy().
GfxSubpath::GfxSubpath(GfxSubpath *subpath) {
  size = subpath->size;
  n = subpath->n;
  x = (double *)gmalloc(size * sizeof(double));
  y = (double *)gmalloc(size * sizeof(double));
  curve = (GBool *)gmalloc(size * sizeof(GBool));
  memcpy(x, subpath->x, n * sizeof(double));
  memcpy(y, subpath->y, n * sizeof(double));
  memcpy(curve, subpath->curve, n * sizeof(GBool));
  closed = subpath->closed;
}

void GfxSubpath::lineTo(double x1, double y1) {
  if (n >= size) {
    size += 16;
    x = (double *)grealloc(x, size * sizeof(double));
    y = (double *)grealloc(y, size * sizeof(double));
    curve = (GBool *)grealloc(curve, size * sizeof(GBool));
  }
  x[n] = x1;
  y[n] = y1;
  curve[n] = gFalse;
  ++n;
}

void GfxSubpath::curveTo(double x1, double y1, double x2, double y2,
			 double x3, double y3) {
  if (n+3 > size) {
    size += 16;
    x = (double *)grealloc(x, size * sizeof(double));
    y = (double *)grealloc(y, size * sizeof(double));
    curve = (GBool *)grealloc(curve, size * sizeof(GBool));
  }
  x[n] = x1;
  y[n] = y1;
  x[n+1] = x2;
  y[n+1] = y2;
  x[n+2] = x3;
  y[n+2] = y3;
  curve[n] = curve[n+1] = gTrue;
  curve[n+2] = gFalse;
  n += 3;
}

void GfxSubpath::close() {
  if (x[n-1] != x[0] || y[n-1] != y[0]) {
    lineTo(x[0], y[0]);
  }
  closed = gTrue;
}

GfxPath::GfxPath() {
  justMoved = gFalse;
  size = 16;
  n = 0;
  firstX = firstY = 0;
  subpaths = (GfxSubpath **)gmalloc(size * sizeof(GfxSubpath *));
}

GfxPath::~GfxPath() {
  int i;

  for (i = 0; i < n; ++i)
    delete subpaths[i];
  gfree(subpaths);
}

// Used for copy().
GfxPath::GfxPath(GBool justMoved1, double firstX1, double firstY1,
		 GfxSubpath **subpaths1, int n1, int size1) {
  int i;

  justMoved = justMoved1;
  firstX = firstX1;
  firstY = firstY1;
  size = size1;
  n = n1;
  subpaths = (GfxSubpath **)gmalloc(size * sizeof(GfxSubpath *));
  for (i = 0; i < n; ++i)
    subpaths[i] = subpaths1[i]->copy();
}

void GfxPath::moveTo(double x, double y) {
  justMoved = gTrue;
  firstX = x;
  firstY = y;
}

void GfxPath::lineTo(double x, double y) {
  if (justMoved) {
    if (n >= size) {
      size += 16;
      subpaths = (GfxSubpath **)
	           grealloc(subpaths, size * sizeof(GfxSubpath *));
    }
    subpaths[n] = new GfxSubpath(firstX, firstY);
    ++n;
    justMoved = gFalse;
  }
  subpaths[n-1]->lineTo(x, y);
}

void GfxPath::curveTo(double x1, double y1, double x2, double y2,
	     double x3, double y3) {
  if (justMoved) {
    if (n >= size) {
      size += 16;
      subpaths = (GfxSubpath **)
	           grealloc(subpaths, size * sizeof(GfxSubpath *));
    }
    subpaths[n] = new GfxSubpath(firstX, firstY);
    ++n;
    justMoved = gFalse;
  }
  subpaths[n-1]->curveTo(x1, y1, x2, y2, x3, y3);
}

void GfxPath::close() {
  // this is necessary to handle the pathological case of
  // moveto/closepath/clip, which defines an empty clipping region
  if (justMoved) {
    if (n >= size) {
      size += 16;
      subpaths = (GfxSubpath **)
	           grealloc(subpaths, size * sizeof(GfxSubpath *));
    }
    subpaths[n] = new GfxSubpath(firstX, firstY);
    ++n;
    justMoved = gFalse;
  }
  subpaths[n-1]->close();
}

//------------------------------------------------------------------------
// GfxState
//------------------------------------------------------------------------

GfxState::GfxState(double dpi, PDFRectangle *pageBox, int rotate,
		   GBool upsideDown) {
  double k;

  px1 = pageBox->x1;
  py1 = pageBox->y1;
  px2 = pageBox->x2;
  py2 = pageBox->y2;
  k = dpi / 72.0;
  if (rotate == 90) {
    ctm[0] = 0;
    ctm[1] = upsideDown ? k : -k;
    ctm[2] = k;
    ctm[3] = 0;
    ctm[4] = -k * py1;
    ctm[5] = k * (upsideDown ? -px1 : px2);
    pageWidth = k * (py2 - py1);
    pageHeight = k * (px2 - px1);
  } else if (rotate == 180) {
    ctm[0] = -k;
    ctm[1] = 0;
    ctm[2] = 0;
    ctm[3] = upsideDown ? k : -k;
    ctm[4] = k * px2;
    ctm[5] = k * (upsideDown ? -py1 : py2);
    pageWidth = k * (px2 - px1);
    pageHeight = k * (py2 - py1);
  } else if (rotate == 270) {
    ctm[0] = 0;
    ctm[1] = upsideDown ? -k : k;
    ctm[2] = -k;
    ctm[3] = 0;
    ctm[4] = k * py2;
    ctm[5] = k * (upsideDown ? px2 : -px1);
    pageWidth = k * (py2 - py1);
    pageHeight = k * (px2 - px1);
  } else {
    ctm[0] = k;
    ctm[1] = 0;
    ctm[2] = 0;
    ctm[3] = upsideDown ? -k : k;
    ctm[4] = -k * px1;
    ctm[5] = k * (upsideDown ? py2 : -py1);
    pageWidth = k * (px2 - px1);
    pageHeight = k * (py2 - py1);
  }

  fillColorSpace = new GfxDeviceGrayColorSpace();
  strokeColorSpace = new GfxDeviceGrayColorSpace();
  fillColor.c[0] = 0;
  strokeColor.c[0] = 0;
  fillPattern = NULL;
  strokePattern = NULL;
  fillOpacity = 1;
  strokeOpacity = 1;

  lineWidth = 1;
  lineDash = NULL;
  lineDashLength = 0;
  lineDashStart = 0;
  flatness = 0;
  lineJoin = 0;
  lineCap = 0;
  miterLimit = 10;

  font = NULL;
  fontSize = 0;
  textMat[0] = 1; textMat[1] = 0;
  textMat[2] = 0; textMat[3] = 1;
  textMat[4] = 0; textMat[5] = 0;
  charSpace = 0;
  wordSpace = 0;
  horizScaling = 1;
  leading = 0;
  rise = 0;
  render = 0;

  path = new GfxPath();
  curX = curY = 0;
  lineX = lineY = 0;

  clipXMin = 0;
  clipYMin = 0;
  clipXMax = pageWidth;
  clipYMax = pageHeight;

  saved = NULL;
}

GfxState::~GfxState() {
  if (fillColorSpace) {
    delete fillColorSpace;
  }
  if (strokeColorSpace) {
    delete strokeColorSpace;
  }
  if (fillPattern) {
    delete fillPattern;
  }
  if (strokePattern) {
    delete strokePattern;
  }
  gfree(lineDash);
  if (path) {
    // this gets set to NULL by restore()
    delete path;
  }
  if (saved) {
    delete saved;
  }
}

// Used for copy();
GfxState::GfxState(GfxState *state) {
  memcpy(this, state, sizeof(GfxState));
  if (fillColorSpace) {
    fillColorSpace = state->fillColorSpace->copy();
  }
  if (strokeColorSpace) {
    strokeColorSpace = state->strokeColorSpace->copy();
  }
  if (fillPattern) {
    fillPattern = state->fillPattern->copy();
  }
  if (strokePattern) {
    strokePattern = state->strokePattern->copy();
  }
  if (lineDashLength > 0) {
    lineDash = (double *)gmalloc(lineDashLength * sizeof(double));
    memcpy(lineDash, state->lineDash, lineDashLength * sizeof(double));
  }
  saved = NULL;
}

void GfxState::getUserClipBBox(double *xMin, double *yMin,
			       double *xMax, double *yMax) {
  double ictm[6];
  double xMin1, yMin1, xMax1, yMax1, det, tx, ty;

  // invert the CTM
  det = 1 / (ctm[0] * ctm[3] - ctm[1] * ctm[2]);
  ictm[0] = ctm[3] * det;
  ictm[1] = -ctm[1] * det;
  ictm[2] = -ctm[2] * det;
  ictm[3] = ctm[0] * det;
  ictm[4] = (ctm[2] * ctm[5] - ctm[3] * ctm[4]) * det;
  ictm[5] = (ctm[1] * ctm[4] - ctm[0] * ctm[5]) * det;

  // transform all four corners of the clip bbox; find the min and max
  // x and y values
  xMin1 = xMax1 = clipXMin * ictm[0] + clipYMin * ictm[2] + ictm[4];
  yMin1 = yMax1 = clipXMin * ictm[1] + clipYMin * ictm[3] + ictm[5];
  tx = clipXMin * ictm[0] + clipYMax * ictm[2] + ictm[4];
  ty = clipXMin * ictm[1] + clipYMax * ictm[3] + ictm[5];
  if (tx < xMin1) {
    xMin1 = tx;
  } else if (tx > xMax1) {
    xMax1 = tx;
  }
  if (ty < yMin1) {
    yMin1 = ty;
  } else if (ty > yMax1) {
    yMax1 = ty;
  }
  tx = clipXMax * ictm[0] + clipYMin * ictm[2] + ictm[4];
  ty = clipXMax * ictm[1] + clipYMin * ictm[3] + ictm[5];
  if (tx < xMin1) {
    xMin1 = tx;
  } else if (tx > xMax1) {
    xMax1 = tx;
  }
  if (ty < yMin1) {
    yMin1 = ty;
  } else if (ty > yMax1) {
    yMax1 = ty;
  }
  tx = clipXMax * ictm[0] + clipYMax * ictm[2] + ictm[4];
  ty = clipXMax * ictm[1] + clipYMax * ictm[3] + ictm[5];
  if (tx < xMin1) {
    xMin1 = tx;
  } else if (tx > xMax1) {
    xMax1 = tx;
  }
  if (ty < yMin1) {
    yMin1 = ty;
  } else if (ty > yMax1) {
    yMax1 = ty;
  }

  *xMin = xMin1;
  *yMin = yMin1;
  *xMax = xMax1;
  *yMax = yMax1;
}

double GfxState::transformWidth(double w) {
  double x, y;

  x = ctm[0] + ctm[2];
  y = ctm[1] + ctm[3];
  return w * sqrt(0.5 * (x * x + y * y));
}

double GfxState::getTransformedFontSize() {
  double x1, y1, x2, y2;

  x1 = textMat[2] * fontSize;
  y1 = textMat[3] * fontSize;
  x2 = ctm[0] * x1 + ctm[2] * y1;
  y2 = ctm[1] * x1 + ctm[3] * y1;
  return sqrt(x2 * x2 + y2 * y2);
}

void GfxState::getFontTransMat(double *m11, double *m12,
			       double *m21, double *m22) {
  *m11 = (textMat[0] * ctm[0] + textMat[1] * ctm[2]) * fontSize;
  *m12 = (textMat[0] * ctm[1] + textMat[1] * ctm[3]) * fontSize;
  *m21 = (textMat[2] * ctm[0] + textMat[3] * ctm[2]) * fontSize;
  *m22 = (textMat[2] * ctm[1] + textMat[3] * ctm[3]) * fontSize;
}

void GfxState::setCTM(double a, double b, double c,
		      double d, double e, double f) {
  int i;

  ctm[0] = a;
  ctm[1] = b;
  ctm[2] = c;
  ctm[3] = d;
  ctm[4] = e;
  ctm[5] = f;

  // avoid FP exceptions on badly messed up PDF files
  for (i = 0; i < 6; ++i) {
    if (ctm[i] > 1e10) {
      ctm[i] = 1e10;
    } else if (ctm[i] < -1e10) {
      ctm[i] = -1e10;
    }
  }
}

void GfxState::concatCTM(double a, double b, double c,
			 double d, double e, double f) {
  double a1 = ctm[0];
  double b1 = ctm[1];
  double c1 = ctm[2];
  double d1 = ctm[3];
  int i;

  ctm[0] = a * a1 + b * c1;
  ctm[1] = a * b1 + b * d1;
  ctm[2] = c * a1 + d * c1;
  ctm[3] = c * b1 + d * d1;
  ctm[4] = e * a1 + f * c1 + ctm[4];
  ctm[5] = e * b1 + f * d1 + ctm[5];

  // avoid FP exceptions on badly messed up PDF files
  for (i = 0; i < 6; ++i) {
    if (ctm[i] > 1e10) {
      ctm[i] = 1e10;
    } else if (ctm[i] < -1e10) {
      ctm[i] = -1e10;
    }
  }
}

void GfxState::setFillColorSpace(GfxColorSpace *colorSpace) {
  if (fillColorSpace) {
    delete fillColorSpace;
  }
  fillColorSpace = colorSpace;
}

void GfxState::setStrokeColorSpace(GfxColorSpace *colorSpace) {
  if (strokeColorSpace) {
    delete strokeColorSpace;
  }
  strokeColorSpace = colorSpace;
}

void GfxState::setFillPattern(GfxPattern *pattern) {
  if (fillPattern) {
    delete fillPattern;
  }
  fillPattern = pattern;
}

void GfxState::setStrokePattern(GfxPattern *pattern) {
  if (strokePattern) {
    delete strokePattern;
  }
  strokePattern = pattern;
}

void GfxState::setLineDash(double *dash, int length, double start) {
  if (lineDash)
    gfree(lineDash);
  lineDash = dash;
  lineDashLength = length;
  lineDashStart = start;
}

void GfxState::clearPath() {
  delete path;
  path = new GfxPath();
}

void GfxState::clip() {
  double xMin, yMin, xMax, yMax, x, y;
  GfxSubpath *subpath;
  int i, j;

  xMin = xMax = yMin = yMax = 0; // make gcc happy
  for (i = 0; i < path->getNumSubpaths(); ++i) {
    subpath = path->getSubpath(i);
    for (j = 0; j < subpath->getNumPoints(); ++j) {
      transform(subpath->getX(j), subpath->getY(j), &x, &y);
      if (i == 0 && j == 0) {
	xMin = xMax = x;
	yMin = yMax = y;
      } else {
	if (x < xMin) {
	  xMin = x;
	} else if (x > xMax) {
	  xMax = x;
	}
	if (y < yMin) {
	  yMin = y;
	} else if (y > yMax) {
	  yMax = y;
	}
      }
    }
  }
  if (xMin > clipXMin) {
    clipXMin = xMin;
  }
  if (yMin > clipYMin) {
    clipYMin = yMin;
  }
  if (xMax < clipXMax) {
    clipXMax = xMax;
  }
  if (yMax < clipYMax) {
    clipYMax = yMax;
  }
}

void GfxState::textShift(double tx, double ty) {
  double dx, dy;

  textTransformDelta(tx, ty, &dx, &dy);
  curX += dx;
  curY += dy;
}

void GfxState::shift(double dx, double dy) {
  curX += dx;
  curY += dy;
}

GfxState *GfxState::save() {
  GfxState *newState;

  newState = copy();
  newState->saved = this;
  return newState;
}

GfxState *GfxState::restore() {
  GfxState *oldState;

  if (saved) {
    oldState = saved;

    // these attributes aren't saved/restored by the q/Q operators
    oldState->path = path;
    oldState->curX = curX;
    oldState->curY = curY;
    oldState->lineX = lineX;
    oldState->lineY = lineY;

    path = NULL;
    saved = NULL;
    delete this;

  } else {
    oldState = this;
  }

  return oldState;
}