gfx.cc

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void Gfx::opEOFillStroke(Object args[], int numArgs) {
  if (!state->isCurPt()) {
    //error(getPos(), "No path in eofill/stroke");
    return;
  }
  if (state->isPath()) {
    if (state->getFillColorSpace()->getMode() == csPattern) {
      doPatternFill(gTrue);
    } else {
      out->eoFill(state);
    }
    if (state->getStrokeColorSpace()->getMode() == csPattern) {
      doPatternStroke();
    } else {
      out->stroke(state);
    }
  }
  doEndPath();
}

void Gfx::opCloseEOFillStroke(Object args[], int numArgs) {
  if (!state->isCurPt()) {
    //error(getPos(), "No path in closepath/eofill/stroke");
    return;
  }
  if (state->isPath()) {
    state->closePath();
    if (state->getFillColorSpace()->getMode() == csPattern) {
      doPatternFill(gTrue);
    } else {
      out->eoFill(state);
    }
    if (state->getStrokeColorSpace()->getMode() == csPattern) {
      doPatternStroke();
    } else {
      out->stroke(state);
    }
  }
  doEndPath();
}

void Gfx::doPatternFill(GBool eoFill) {
  GfxPattern *pattern;

  // this is a bit of a kludge -- patterns can be really slow, so we
  // skip them if we're only doing text extraction, since they almost
  // certainly don't contain any text
  if (!out->needNonText()) {
    return;
  }

  if (!(pattern = state->getFillPattern())) {
    return;
  }
  switch (pattern->getType()) {
  case 1:
    doTilingPatternFill((GfxTilingPattern *)pattern, gFalse, eoFill);
    break;
  case 2:
    doShadingPatternFill((GfxShadingPattern *)pattern, gFalse, eoFill);
    break;
  default:
    error(getPos(), "Unimplemented pattern type (%d) in fill",
	  pattern->getType());
    break;
  }
}

void Gfx::doPatternStroke() {
  GfxPattern *pattern;

  // this is a bit of a kludge -- patterns can be really slow, so we
  // skip them if we're only doing text extraction, since they almost
  // certainly don't contain any text
  if (!out->needNonText()) {
    return;
  }

  if (!(pattern = state->getStrokePattern())) {
    return;
  }
  switch (pattern->getType()) {
  case 1:
    doTilingPatternFill((GfxTilingPattern *)pattern, gTrue, gFalse);
    break;
  case 2:
    doShadingPatternFill((GfxShadingPattern *)pattern, gTrue, gFalse);
    break;
  default:
    error(getPos(), "Unimplemented pattern type (%d) in stroke",
	  pattern->getType());
    break;
  }
}

void Gfx::doTilingPatternFill(GfxTilingPattern *tPat,
			      GBool stroke, GBool eoFill) {
  GfxPatternColorSpace *patCS;
  GfxColorSpace *cs;
  GfxPath *savedPath;
  double xMin, yMin, xMax, yMax, x, y, x1, y1;
  double cxMin, cyMin, cxMax, cyMax;
  int xi0, yi0, xi1, yi1, xi, yi;
  double *ctm, *btm, *ptm;
  double m[6], ictm[6], m1[6], imb[6];
  double det;
  double xstep, ystep;
  int i;

  // get color space
  patCS = (GfxPatternColorSpace *)(stroke ? state->getStrokeColorSpace()
				          : state->getFillColorSpace());

  // construct a (pattern space) -> (current space) transform matrix
  ctm = state->getCTM();
  btm = baseMatrix;
  ptm = tPat->getMatrix();
  // iCTM = invert 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;
  // m1 = PTM * BTM = PTM * base transform matrix
  m1[0] = ptm[0] * btm[0] + ptm[1] * btm[2];
  m1[1] = ptm[0] * btm[1] + ptm[1] * btm[3];
  m1[2] = ptm[2] * btm[0] + ptm[3] * btm[2];
  m1[3] = ptm[2] * btm[1] + ptm[3] * btm[3];
  m1[4] = ptm[4] * btm[0] + ptm[5] * btm[2] + btm[4];
  m1[5] = ptm[4] * btm[1] + ptm[5] * btm[3] + btm[5];
  // m = m1 * iCTM = (PTM * BTM) * (iCTM)
  m[0] = m1[0] * ictm[0] + m1[1] * ictm[2];
  m[1] = m1[0] * ictm[1] + m1[1] * ictm[3];
  m[2] = m1[2] * ictm[0] + m1[3] * ictm[2];
  m[3] = m1[2] * ictm[1] + m1[3] * ictm[3];
  m[4] = m1[4] * ictm[0] + m1[5] * ictm[2] + ictm[4];
  m[5] = m1[4] * ictm[1] + m1[5] * ictm[3] + ictm[5];

  // construct a (device space) -> (pattern space) transform matrix
  det = 1 / (m1[0] * m1[3] - m1[1] * m1[2]);
  imb[0] = m1[3] * det;
  imb[1] = -m1[1] * det;
  imb[2] = -m1[2] * det;
  imb[3] = m1[0] * det;
  imb[4] = (m1[2] * m1[5] - m1[3] * m1[4]) * det;
  imb[5] = (m1[1] * m1[4] - m1[0] * m1[5]) * det;

  // save current graphics state
  savedPath = state->getPath()->copy();
  saveState();

  // set underlying color space (for uncolored tiling patterns); set
  // various other parameters (stroke color, line width) to match
  // Adobe's behavior
  if (tPat->getPaintType() == 2 && (cs = patCS->getUnder())) {
    state->setFillColorSpace(cs->copy());
    out->updateFillColorSpace(state);
    state->setStrokeColorSpace(cs->copy());
    out->updateStrokeColorSpace(state);
    state->setStrokeColor(state->getFillColor());
  } else {
    state->setFillColorSpace(new GfxDeviceGrayColorSpace());
    out->updateFillColorSpace(state);
    state->setStrokeColorSpace(new GfxDeviceGrayColorSpace());
    out->updateStrokeColorSpace(state);
  }
  state->setFillPattern(NULL);
  out->updateFillColor(state);
  state->setStrokePattern(NULL);
  out->updateStrokeColor(state);
  if (!stroke) {
    state->setLineWidth(0);
    out->updateLineWidth(state);
  }

  // clip to current path
  if (stroke) {
    state->clipToStrokePath();
    out->clipToStrokePath(state);
  } else {
    state->clip();
    if (eoFill) {
      out->eoClip(state);
    } else {
      out->clip(state);
    }
  }
  state->clearPath();

  // get the clip region, check for empty
  state->getClipBBox(&cxMin, &cyMin, &cxMax, &cyMax);
  if (cxMin > cxMax || cyMin > cyMax) {
    goto err;
  }

  // transform clip region bbox to pattern space
  xMin = xMax = cxMin * imb[0] + cyMin * imb[2] + imb[4];
  yMin = yMax = cxMin * imb[1] + cyMin * imb[3] + imb[5];
  x1 = cxMin * imb[0] + cyMax * imb[2] + imb[4];
  y1 = cxMin * imb[1] + cyMax * imb[3] + imb[5];
  if (x1 < xMin) {
    xMin = x1;
  } else if (x1 > xMax) {
    xMax = x1;
  }
  if (y1 < yMin) {
    yMin = y1;
  } else if (y1 > yMax) {
    yMax = y1;
  }
  x1 = cxMax * imb[0] + cyMin * imb[2] + imb[4];
  y1 = cxMax * imb[1] + cyMin * imb[3] + imb[5];
  if (x1 < xMin) {
    xMin = x1;
  } else if (x1 > xMax) {
    xMax = x1;
  }
  if (y1 < yMin) {
    yMin = y1;
  } else if (y1 > yMax) {
    yMax = y1;
  }
  x1 = cxMax * imb[0] + cyMax * imb[2] + imb[4];
  y1 = cxMax * imb[1] + cyMax * imb[3] + imb[5];
  if (x1 < xMin) {
    xMin = x1;
  } else if (x1 > xMax) {
    xMax = x1;
  }
  if (y1 < yMin) {
    yMin = y1;
  } else if (y1 > yMax) {
    yMax = y1;
  }

  // draw the pattern
  //~ this should treat negative steps differently -- start at right/top
  //~ edge instead of left/bottom (?)
  xstep = fabs(tPat->getXStep());
  ystep = fabs(tPat->getYStep());
  xi0 = (int)ceil((xMin - tPat->getBBox()[2]) / xstep);
  xi1 = (int)floor((xMax - tPat->getBBox()[0]) / xstep) + 1;
  yi0 = (int)ceil((yMin - tPat->getBBox()[3]) / ystep);
  yi1 = (int)floor((yMax - tPat->getBBox()[1]) / ystep) + 1;
  for (i = 0; i < 4; ++i) {
    m1[i] = m[i];
  }
  if (out->useTilingPatternFill()) {
    m1[4] = m[4];
    m1[5] = m[5];
    out->tilingPatternFill(state, tPat->getContentStream(),
			   tPat->getPaintType(), tPat->getResDict(),
			   m1, tPat->getBBox(),
			   xi0, yi0, xi1, yi1, xstep, ystep);
  } else {
    for (yi = yi0; yi < yi1; ++yi) {
      for (xi = xi0; xi < xi1; ++xi) {
	x = xi * xstep;
	y = yi * ystep;
	m1[4] = x * m[0] + y * m[2] + m[4];
	m1[5] = x * m[1] + y * m[3] + m[5];
	doForm1(tPat->getContentStream(), tPat->getResDict(),
		m1, tPat->getBBox());
      }
    }
  }

  // restore graphics state
 err:
  restoreState();
  state->setPath(savedPath);
}

void Gfx::doShadingPatternFill(GfxShadingPattern *sPat,
			       GBool stroke, GBool eoFill) {
  GfxShading *shading;
  GfxPath *savedPath;
  double *ctm, *btm, *ptm;
  double m[6], ictm[6], m1[6];
  double xMin, yMin, xMax, yMax;
  double det;

  shading = sPat->getShading();

  // save current graphics state
  savedPath = state->getPath()->copy();
  saveState();

  // clip to bbox
  if (shading->getHasBBox()) {
    shading->getBBox(&xMin, &yMin, &xMax, &yMax);
    state->moveTo(xMin, yMin);
    state->lineTo(xMax, yMin);
    state->lineTo(xMax, yMax);
    state->lineTo(xMin, yMax);
    state->closePath();
    state->clip();
    out->clip(state);
    state->setPath(savedPath->copy());
  }

  // clip to current path
  if (stroke) {
    state->clipToStrokePath();
    out->clipToStrokePath(state);
  } else {
    state->clip();
    if (eoFill) {
      out->eoClip(state);
    } else {
      out->clip(state);
    }
  }

  // set the color space
  state->setFillColorSpace(shading->getColorSpace()->copy());
  out->updateFillColorSpace(state);

  // background color fill
  if (shading->getHasBackground()) {
    state->setFillColor(shading->getBackground());
    out->updateFillColor(state);
    out->fill(state);
  }
  state->clearPath();

  // construct a (pattern space) -> (current space) transform matrix
  ctm = state->getCTM();
  btm = baseMatrix;
  ptm = sPat->getMatrix();
  // iCTM = invert 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;
  // m1 = PTM * BTM = PTM * base transform matrix
  m1[0] = ptm[0] * btm[0] + ptm[1] * btm[2];
  m1[1] = ptm[0] * btm[1] + ptm[1] * btm[3];
  m1[2] = ptm[2] * btm[0] + ptm[3] * btm[2];
  m1[3] = ptm[2] * btm[1] + ptm[3] * btm[3];
  m1[4] = ptm[4] * btm[0] + ptm[5] * btm[2] + btm[4];
  m1[5] = ptm[4] * btm[1] + ptm[5] * btm[3] + btm[5];
  // m = m1 * iCTM = (PTM * BTM) * (iCTM)
  m[0] = m1[0] * ictm[0] + m1[1] * ictm[2];
  m[1] = m1[0] * ictm[1] + m1[1] * ictm[3];
  m[2] = m1[2] * ictm[0] + m1[3] * ictm[2];
  m[3] = m1[2] * ictm[1] + m1[3] * ictm[3];
  m[4] = m1[4] * ictm[0] + m1[5] * ictm[2] + ictm[4];
  m[5] = m1[4] * ictm[1] + m1[5] * ictm[3] + ictm[5];

  // set the new matrix
  state->concatCTM(m[0], m[1], m[2], m[3], m[4], m[5]);
  out->updateCTM(state, m[0], m[1], m[2], m[3], m[4], m[5]);

#if 1 //~tmp: turn off anti-aliasing temporarily
  GBool vaa = out->getVectorAntialias();
  if (vaa) {
    out->setVectorAntialias(gFalse);
  }
#endif

  // do shading type-specific operations
  switch (shading->getType()) {
  case 1:
    doFunctionShFill((GfxFunctionShading *)shading);
    break;
  case 2:
    doAxialShFill((GfxAxialShading *)shading);
    break;
  case 3:
    doRadialShFill((GfxRadialShading *)shading);
    break;
  case 4:
  case 5:
    doGouraudTriangleShFill((GfxGouraudTriangleShading *)shading);
    break;
  case 6:
  case 7:
    doPatchMeshShFill((GfxPatchMeshShading *)shading);
    break;
  }

#if 1 //~tmp: turn off anti-aliasing temporarily
  if (vaa) {
    out->setVectorAntialias(gTrue);
  }
#endif

  // restore graphics state
  restoreState();
  state->setPath(savedPath);
}

void Gfx::opShFill(Object args[], int numArgs) {
  GfxShading *shading;
  GfxPath *savedPath;
  double xMin, yMin, xMax, yMax;

  if (!(shading = res->lookupShading(args[0].getName()))) {
    return;
  }

  // save current graphics state
  savedPath = state->getPath()->copy();
  saveState();

  // clip to bbox
  if (shading->getHasBBox()) {
    shading->getBBox(&xMin, &yMin, &xMax, &yMax);
    state->moveTo(xMin, yMin);
    state->lineTo(xMax, yMin);
    state->lineTo(xMax, yMax);
    state->lineTo(xMin, yMax);
    state->closePath();
    state->clip();
    out->clip(state);
    state->clearPath();
  }

  // set the color space
  state->setFillColorSpace(shading->getColorSpace()->copy());
  out->updateFillColorSpace(state);

#if 1 //~tmp: turn off anti-aliasing temporarily
  GBool vaa = out->getVectorAntialias();
  if (vaa) {
    out->setVectorAntialias(gFalse);
  }
#endif

  // do shading type-specific operations
  switch (shading->getType()) {
  case 1:
    doFunctionShFill((GfxFunctionShading *)shading);
    break;
  case 2:
    doAxialShFill((GfxAxialShading *)shading);
    break;
  case 3:
    doRadialShFill((GfxRadialShading *)shading);
    break;
  case 4:
  case 5:
    doGouraudTriangleShFill((GfxGouraudTriangleShading *)shading);
    break;
  case 6:
  case 7:
    doPatchMeshShFill((GfxPatchMeshShading *)shading);
    break;
  }

#if 1 //~tmp: turn off anti-aliasing temporarily
  if (vaa) {
    out->setVectorAntialias(gTrue);
  }
#endif

  // restore graphics state
  restoreState();
  state->setPath(savedPath);

  delete shading;
}

void Gfx::doFunctionShFill(GfxFunctionShading *shading) {
  double x0, y0, x1, y1;
  GfxColor colors[4];

  if (out->useShadedFills() &&
      out->functionShadedFill(state, shading)) {
    return;
  }

  shading->getDomain(&x0, &y0, &x1, &y1);
  shading->getColor(x0, y0, &colors[0]);
  shading->getColor(x0, y1, &colors[1]);
  shading->getColor(x1, y0, &colors[2]);
  shading->getColor(x1, y1, &colors[3]);
  doFunctionShFill1(shading, x0, y0, x1, y1, colors, 0);
}

void Gfx::doFunctionShFill1(GfxFunctionShading *shading,
			    double x0, double y0,
			    double x1, double y1,
			    GfxColor *colors, int depth) {
  GfxColor fillColor;
  GfxColor color0M, color1M, colorM0, colorM1, colorMM;
  GfxColor colors2[4];
  double *matrix;
  double xM, yM;
  int nComps, i, j;

  nComps = shading->getColorSpace()->getNComps();
  matrix = shading->getMatrix();

  // compare the four corner colors
  for (i = 0; i < 4; ++i) {