poppler/Gfx.cc

//========================================================================
//
// Gfx.cc
//
// Copyright 1996-2013 Glyph & Cog, LLC
//
//========================================================================

//========================================================================
//
// Modified under the Poppler project - http://poppler.freedesktop.org
//
// All changes made under the Poppler project to this file are licensed
// under GPL version 2 or later
//
// Copyright (C) 2005 Jonathan Blandford <jrb@redhat.com>
// Copyright (C) 2005-2013, 2015-2019 Albert Astals Cid <aacid@kde.org>
// Copyright (C) 2006 Thorkild Stray <thorkild@ifi.uio.no>
// Copyright (C) 2006 Kristian Høgsberg <krh@redhat.com>
// Copyright (C) 2006-2011 Carlos Garcia Campos <carlosgc@gnome.org>
// Copyright (C) 2006, 2007 Jeff Muizelaar <jeff@infidigm.net>
// Copyright (C) 2007, 2008 Brad Hards <bradh@kde.org>
// Copyright (C) 2007, 2011, 2017 Adrian Johnson <ajohnson@redneon.com>
// Copyright (C) 2007, 2008 Iñigo Martínez <inigomartinez@gmail.com>
// Copyright (C) 2007 Koji Otani <sho@bbr.jp>
// Copyright (C) 2007 Krzysztof Kowalczyk <kkowalczyk@gmail.com>
// Copyright (C) 2008 Pino Toscano <pino@kde.org>
// Copyright (C) 2008 Michael Vrable <mvrable@cs.ucsd.edu>
// Copyright (C) 2008 Hib Eris <hib@hiberis.nl>
// Copyright (C) 2009 M Joonas Pihlaja <jpihlaja@cc.helsinki.fi>
// Copyright (C) 2009-2016 Thomas Freitag <Thomas.Freitag@alfa.de>
// Copyright (C) 2009 William Bader <williambader@hotmail.com>
// Copyright (C) 2009, 2010 David Benjamin <davidben@mit.edu>
// Copyright (C) 2010 Nils Höglund <nils.hoglund@gmail.com>
// Copyright (C) 2010 Christian Feuersänger <cfeuersaenger@googlemail.com>
// Copyright (C) 2011 Axel Strübing <axel.struebing@freenet.de>
// Copyright (C) 2012 Even Rouault <even.rouault@mines-paris.org>
// Copyright (C) 2012, 2013 Fabio D'Urso <fabiodurso@hotmail.it>
// Copyright (C) 2012 Lu Wang <coolwanglu@gmail.com>
// Copyright (C) 2014 Jason Crain <jason@aquaticape.us>
// Copyright (C) 2017, 2018 Klarälvdalens Datakonsult AB, a KDAB Group company, <info@kdab.com>. Work sponsored by the LiMux project of the city of Munich
// Copyright (C) 2018, 2019 Adam Reichold <adam.reichold@t-online.de>
// Copyright (C) 2018 Denis Onishchenko <denis.onischenko@gmail.com>
// Copyright (C) 2019 LE GARREC Vincent <legarrec.vincent@gmail.com>
// Copyright (C) 2019 Oliver Sander <oliver.sander@tu-dresden.de>
//
// To see a description of the changes please see the Changelog file that
// came with your tarball or type make ChangeLog if you are building from git
//
//========================================================================

#include <config.h>

#include <stdlib.h>
#include <stdio.h>
#include <stddef.h>
#include <string.h>
#include <math.h>
#include <memory>
#include "goo/gmem.h"
#include "goo/GooTimer.h"
#include "GlobalParams.h"
#include "CharTypes.h"
#include "Object.h"
#include "PDFDoc.h"
#include "Array.h"
#include "Annot.h"
#include "Dict.h"
#include "Stream.h"
#include "Lexer.h"
#include "Parser.h"
#include "GfxFont.h"
#include "GfxState.h"
#include "OutputDev.h"
#include "Page.h"
#include "Annot.h"
#include "Error.h"
#include "Gfx.h"
#include "ProfileData.h"
#include "Catalog.h"
#include "OptionalContent.h"

// the MSVC math.h doesn't define this
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif

//------------------------------------------------------------------------
// constants
//------------------------------------------------------------------------

// Max recursive depth for a function shading fill.
#define functionMaxDepth 6

// Max delta allowed in any color component for a function shading fill.
#define functionColorDelta (dblToCol(1 / 256.0))

// Max number of splits along the t axis for an axial shading fill.
#define axialMaxSplits 256

// Max delta allowed in any color component for an axial shading fill.
#define axialColorDelta (dblToCol(1 / 256.0))

// Max number of splits along the t axis for a radial shading fill.
#define radialMaxSplits 256

// Max delta allowed in any color component for a radial shading fill.
#define radialColorDelta (dblToCol(1 / 256.0))

// Max recursive depth for a Gouraud triangle shading fill.
//
// Triangles will be split at most gouraudMaxDepth times (each time into 4
// smaller ones). That makes pow(4,gouraudMaxDepth) many triangles for
// every triangle.
#define gouraudMaxDepth 6

// Max delta allowed in any color component for a Gouraud triangle
// shading fill.
#define gouraudColorDelta (dblToCol(3. / 256.0))

// Gouraud triangle: if the three color parameters differ by at more than this percend of 
// the total color parameter range, the triangle will be refined
#define gouraudParameterizedColorDelta 5e-3

// Max recursive depth for a patch mesh shading fill.
#define patchMaxDepth 6

// Max delta allowed in any color component for a patch mesh shading
// fill.
#define patchColorDelta (dblToCol((3. / 256.0)))

//------------------------------------------------------------------------
// Operator table
//------------------------------------------------------------------------

Operator Gfx::opTab[] = {
  {"\"",  3, {tchkNum,    tchkNum,    tchkString},
          &Gfx::opMoveSetShowText},
  {"'",   1, {tchkString},
          &Gfx::opMoveShowText},
  {"B",   0, {tchkNone},
          &Gfx::opFillStroke},
  {"B*",  0, {tchkNone},
          &Gfx::opEOFillStroke},
  {"BDC", 2, {tchkName,   tchkProps},
          &Gfx::opBeginMarkedContent},
  {"BI",  0, {tchkNone},
          &Gfx::opBeginImage},
  {"BMC", 1, {tchkName},
          &Gfx::opBeginMarkedContent},
  {"BT",  0, {tchkNone},
          &Gfx::opBeginText},
  {"BX",  0, {tchkNone},
          &Gfx::opBeginIgnoreUndef},
  {"CS",  1, {tchkName},
          &Gfx::opSetStrokeColorSpace},
  {"DP",  2, {tchkName,   tchkProps},
          &Gfx::opMarkPoint},
  {"Do",  1, {tchkName},
          &Gfx::opXObject},
  {"EI",  0, {tchkNone},
          &Gfx::opEndImage},
  {"EMC", 0, {tchkNone},
          &Gfx::opEndMarkedContent},
  {"ET",  0, {tchkNone},
          &Gfx::opEndText},
  {"EX",  0, {tchkNone},
          &Gfx::opEndIgnoreUndef},
  {"F",   0, {tchkNone},
          &Gfx::opFill},
  {"G",   1, {tchkNum},
          &Gfx::opSetStrokeGray},
  {"ID",  0, {tchkNone},
          &Gfx::opImageData},
  {"J",   1, {tchkInt},
          &Gfx::opSetLineCap},
  {"K",   4, {tchkNum,    tchkNum,    tchkNum,    tchkNum},
          &Gfx::opSetStrokeCMYKColor},
  {"M",   1, {tchkNum},
          &Gfx::opSetMiterLimit},
  {"MP",  1, {tchkName},
          &Gfx::opMarkPoint},
  {"Q",   0, {tchkNone},
          &Gfx::opRestore},
  {"RG",  3, {tchkNum,    tchkNum,    tchkNum},
          &Gfx::opSetStrokeRGBColor},
  {"S",   0, {tchkNone},
          &Gfx::opStroke},
  {"SC",  -4, {tchkNum,   tchkNum,    tchkNum,    tchkNum},
          &Gfx::opSetStrokeColor},
  {"SCN", -33, {tchkSCN,   tchkSCN,    tchkSCN,    tchkSCN,
	        tchkSCN,   tchkSCN,    tchkSCN,    tchkSCN,
	        tchkSCN,   tchkSCN,    tchkSCN,    tchkSCN,
	        tchkSCN,   tchkSCN,    tchkSCN,    tchkSCN,
	        tchkSCN,   tchkSCN,    tchkSCN,    tchkSCN,
	        tchkSCN,   tchkSCN,    tchkSCN,    tchkSCN,
	        tchkSCN,   tchkSCN,    tchkSCN,    tchkSCN,
	        tchkSCN,   tchkSCN,    tchkSCN,    tchkSCN,
	        tchkSCN},
          &Gfx::opSetStrokeColorN},
  {"T*",  0, {tchkNone},
          &Gfx::opTextNextLine},
  {"TD",  2, {tchkNum,    tchkNum},
          &Gfx::opTextMoveSet},
  {"TJ",  1, {tchkArray},
          &Gfx::opShowSpaceText},
  {"TL",  1, {tchkNum},
          &Gfx::opSetTextLeading},
  {"Tc",  1, {tchkNum},
          &Gfx::opSetCharSpacing},
  {"Td",  2, {tchkNum,    tchkNum},
          &Gfx::opTextMove},
  {"Tf",  2, {tchkName,   tchkNum},
          &Gfx::opSetFont},
  {"Tj",  1, {tchkString},
          &Gfx::opShowText},
  {"Tm",  6, {tchkNum,    tchkNum,    tchkNum,    tchkNum,
	      tchkNum,    tchkNum},
          &Gfx::opSetTextMatrix},
  {"Tr",  1, {tchkInt},
          &Gfx::opSetTextRender},
  {"Ts",  1, {tchkNum},
          &Gfx::opSetTextRise},
  {"Tw",  1, {tchkNum},
          &Gfx::opSetWordSpacing},
  {"Tz",  1, {tchkNum},
          &Gfx::opSetHorizScaling},
  {"W",   0, {tchkNone},
          &Gfx::opClip},
  {"W*",  0, {tchkNone},
          &Gfx::opEOClip},
  {"b",   0, {tchkNone},
          &Gfx::opCloseFillStroke},
  {"b*",  0, {tchkNone},
          &Gfx::opCloseEOFillStroke},
  {"c",   6, {tchkNum,    tchkNum,    tchkNum,    tchkNum,
	      tchkNum,    tchkNum},
          &Gfx::opCurveTo},
  {"cm",  6, {tchkNum,    tchkNum,    tchkNum,    tchkNum,
	      tchkNum,    tchkNum},
          &Gfx::opConcat},
  {"cs",  1, {tchkName},
          &Gfx::opSetFillColorSpace},
  {"d",   2, {tchkArray,  tchkNum},
          &Gfx::opSetDash},
  {"d0",  2, {tchkNum,    tchkNum},
          &Gfx::opSetCharWidth},
  {"d1",  6, {tchkNum,    tchkNum,    tchkNum,    tchkNum,
	      tchkNum,    tchkNum},
          &Gfx::opSetCacheDevice},
  {"f",   0, {tchkNone},
          &Gfx::opFill},
  {"f*",  0, {tchkNone},
          &Gfx::opEOFill},
  {"g",   1, {tchkNum},
          &Gfx::opSetFillGray},
  {"gs",  1, {tchkName},
          &Gfx::opSetExtGState},
  {"h",   0, {tchkNone},
          &Gfx::opClosePath},
  {"i",   1, {tchkNum},
          &Gfx::opSetFlat},
  {"j",   1, {tchkInt},
          &Gfx::opSetLineJoin},
  {"k",   4, {tchkNum,    tchkNum,    tchkNum,    tchkNum},
          &Gfx::opSetFillCMYKColor},
  {"l",   2, {tchkNum,    tchkNum},
          &Gfx::opLineTo},
  {"m",   2, {tchkNum,    tchkNum},
          &Gfx::opMoveTo},
  {"n",   0, {tchkNone},
          &Gfx::opEndPath},
  {"q",   0, {tchkNone},
          &Gfx::opSave},
  {"re",  4, {tchkNum,    tchkNum,    tchkNum,    tchkNum},
          &Gfx::opRectangle},
  {"rg",  3, {tchkNum,    tchkNum,    tchkNum},
          &Gfx::opSetFillRGBColor},
  {"ri",  1, {tchkName},
          &Gfx::opSetRenderingIntent},
  {"s",   0, {tchkNone},
          &Gfx::opCloseStroke},
  {"sc",  -4, {tchkNum,   tchkNum,    tchkNum,    tchkNum},
          &Gfx::opSetFillColor},
  {"scn", -33, {tchkSCN,   tchkSCN,    tchkSCN,    tchkSCN,
	        tchkSCN,   tchkSCN,    tchkSCN,    tchkSCN,
	        tchkSCN,   tchkSCN,    tchkSCN,    tchkSCN,
	        tchkSCN,   tchkSCN,    tchkSCN,    tchkSCN,
	        tchkSCN,   tchkSCN,    tchkSCN,    tchkSCN,
	        tchkSCN,   tchkSCN,    tchkSCN,    tchkSCN,
	        tchkSCN,   tchkSCN,    tchkSCN,    tchkSCN,
	        tchkSCN,   tchkSCN,    tchkSCN,    tchkSCN,
	        tchkSCN},
          &Gfx::opSetFillColorN},
  {"sh",  1, {tchkName},
          &Gfx::opShFill},
  {"v",   4, {tchkNum,    tchkNum,    tchkNum,    tchkNum},
          &Gfx::opCurveTo1},
  {"w",   1, {tchkNum},
          &Gfx::opSetLineWidth},
  {"y",   4, {tchkNum,    tchkNum,    tchkNum,    tchkNum},
          &Gfx::opCurveTo2},
};

#define numOps (sizeof(opTab) / sizeof(Operator))

static inline bool isSameGfxColor(const GfxColor &colorA, const GfxColor &colorB, unsigned int nComps, double delta) {
  for (unsigned int k = 0; k < nComps; ++k) {
    if (abs(colorA.c[k] - colorB.c[k]) > delta) {
      return false;
    }
  }
  return true;
}

//------------------------------------------------------------------------
// GfxResources
//------------------------------------------------------------------------

GfxResources::GfxResources(XRef *xrefA, Dict *resDictA, GfxResources *nextA) :
    gStateCache(2), xref(xrefA) {
  Ref r;

  if (resDictA) {

    // build font dictionary
    Dict *resDict = resDictA->copy(xref);
    fonts = nullptr;
    const Object &obj1 = resDict->lookupNF("Font");
    if (obj1.isRef()) {
      Object obj2 = obj1.fetch(xref);
      if (obj2.isDict()) {
	r = obj1.getRef();
	fonts = new GfxFontDict(xref, &r, obj2.getDict());
      }
    } else if (obj1.isDict()) {
      fonts = new GfxFontDict(xref, nullptr, obj1.getDict());
    }

    // get XObject dictionary
    xObjDict = resDict->lookup("XObject");

    // get color space dictionary
    colorSpaceDict = resDict->lookup("ColorSpace");

    // get pattern dictionary
    patternDict = resDict->lookup("Pattern");

    // get shading dictionary
    shadingDict = resDict->lookup("Shading");

    // get graphics state parameter dictionary
    gStateDict = resDict->lookup("ExtGState");

    // get properties dictionary
    propertiesDict = resDict->lookup("Properties");

    delete resDict;
  } else {
    fonts = nullptr;
    xObjDict.setToNull();
    colorSpaceDict.setToNull();
    patternDict.setToNull();
    shadingDict.setToNull();
    gStateDict.setToNull();
    propertiesDict.setToNull();
  }

  next = nextA;
}

GfxResources::~GfxResources() {
  delete fonts;
}

GfxFont *GfxResources::doLookupFont(const char *name) const
{
  GfxFont *font;
  const GfxResources *resPtr;

  for (resPtr = this; resPtr; resPtr = resPtr->next) {
    if (resPtr->fonts) {
      if ((font = resPtr->fonts->lookup(name)))
	return font;
    }
  }
  error(errSyntaxError, -1, "Unknown font tag '{0:s}'", name);
  return nullptr;
}

GfxFont *GfxResources::lookupFont(const char *name) {
  return doLookupFont(name);
}

const GfxFont *GfxResources::lookupFont(const char *name) const {
  return doLookupFont(name);
}

Object GfxResources::lookupXObject(const char *name) {
  GfxResources *resPtr;

  for (resPtr = this; resPtr; resPtr = resPtr->next) {
    if (resPtr->xObjDict.isDict()) {
      Object obj = resPtr->xObjDict.dictLookup(name);
      if (!obj.isNull())
	return obj;
    }
  }
  error(errSyntaxError, -1, "XObject '{0:s}' is unknown", name);
  return Object(objNull);
}

Object GfxResources::lookupXObjectNF(const char *name) {
  GfxResources *resPtr;

  for (resPtr = this; resPtr; resPtr = resPtr->next) {
    if (resPtr->xObjDict.isDict()) {
      Object obj = resPtr->xObjDict.dictLookupNF(name).copy();
      if (!obj.isNull())
	return obj;
    }
  }
  error(errSyntaxError, -1, "XObject '{0:s}' is unknown", name);
  return Object(objNull);
}

Object GfxResources::lookupMarkedContentNF(const char *name) {
  GfxResources *resPtr;

  for (resPtr = this; resPtr; resPtr = resPtr->next) {
    if (resPtr->propertiesDict.isDict()) {
      Object obj = resPtr->propertiesDict.dictLookupNF(name).copy();
      if (!obj.isNull())
	return obj;
    }
  }
  error(errSyntaxError, -1, "Marked Content '{0:s}' is unknown", name);
  return Object(objNull);
}

Object GfxResources::lookupColorSpace(const char *name) {
  GfxResources *resPtr;

  for (resPtr = this; resPtr; resPtr = resPtr->next) {
    if (resPtr->colorSpaceDict.isDict()) {
      Object obj = resPtr->colorSpaceDict.dictLookup(name);
      if (!obj.isNull()) {
	return obj;
      }
    }
  }
  return Object(objNull);
}

GfxPattern *GfxResources::lookupPattern(const char *name, OutputDev *out, GfxState *state) {
  GfxResources *resPtr;

  for (resPtr = this; resPtr; resPtr = resPtr->next) {
    if (resPtr->patternDict.isDict()) {
      Ref patternRef = Ref::INVALID();
      Object obj = resPtr->patternDict.getDict()->lookup(name, &patternRef);
      if (!obj.isNull()) {
	return GfxPattern::parse(resPtr, &obj, out, state, patternRef.num);
      }
    }
  }
  error(errSyntaxError, -1, "Unknown pattern '{0:s}'", name);
  return nullptr;
}

GfxShading *GfxResources::lookupShading(const char *name, OutputDev *out, GfxState *state) {
  GfxResources *resPtr;
  GfxShading *shading;

  for (resPtr = this; resPtr; resPtr = resPtr->next) {
    if (resPtr->shadingDict.isDict()) {
      Object obj = resPtr->shadingDict.dictLookup(name);
      if (!obj.isNull()) {
	shading = GfxShading::parse(resPtr, &obj, out, state);
	return shading;
      }
    }
  }
  error(errSyntaxError, -1, "ExtGState '{0:s}' is unknown", name);
  return nullptr;
}

Object GfxResources::lookupGState(const char *name) {
  Object obj = lookupGStateNF(name);
  if (obj.isNull())
    return Object(objNull);

  if (!obj.isRef())
    return obj;
  
  const Ref ref = obj.getRef();

  if (auto *item = gStateCache.lookup(ref)) {
    return item->copy();
  }

  auto *item = new Object{xref->fetch(ref)};
  gStateCache.put(ref, item);
  return item->copy();
}

Object GfxResources::lookupGStateNF(const char *name) {
  GfxResources *resPtr;

  for (resPtr = this; resPtr; resPtr = resPtr->next) {
    if (resPtr->gStateDict.isDict()) {
      Object obj = resPtr->gStateDict.dictLookupNF(name).copy();
      if (!obj.isNull()) {
	return obj;
      }
    }
  }
  error(errSyntaxError, -1, "ExtGState '{0:s}' is unknown", name);
  return Object(objNull);
}

//------------------------------------------------------------------------
// Gfx
//------------------------------------------------------------------------

Gfx::Gfx(PDFDoc *docA, OutputDev *outA, int pageNum, Dict *resDict,
	 double hDPI, double vDPI, const PDFRectangle *box,
	 const PDFRectangle *cropBox, int rotate,
	 bool (*abortCheckCbkA)(void *data),
	 void *abortCheckCbkDataA, XRef *xrefA)
{
  int i;

  doc = docA;
  xref = (xrefA == nullptr) ? doc->getXRef() : xrefA;
  catalog = doc->getCatalog();
  subPage = false;
  printCommands = globalParams->getPrintCommands();
  profileCommands = globalParams->getProfileCommands();
  mcStack = nullptr;
  parser = nullptr;

  // start the resource stack
  res = new GfxResources(xref, resDict, nullptr);

  // initialize
  out = outA;
  state = new GfxState(hDPI, vDPI, box, rotate, out->upsideDown());
  stackHeight = 1;
  pushStateGuard();
  fontChanged = false;
  clip = clipNone;
  ignoreUndef = 0;
  out->startPage(pageNum, state, xref);
  out->setDefaultCTM(state->getCTM());
  out->updateAll(state);
  for (i = 0; i < 6; ++i) {
    baseMatrix[i] = state->getCTM()[i];
  }
  formDepth = 0;
  ocState = true;
  parser = nullptr;
  abortCheckCbk = abortCheckCbkA;
  abortCheckCbkData = abortCheckCbkDataA;

  // set crop box
  if (cropBox) {
    state->moveTo(cropBox->x1, cropBox->y1);
    state->lineTo(cropBox->x2, cropBox->y1);
    state->lineTo(cropBox->x2, cropBox->y2);
    state->lineTo(cropBox->x1, cropBox->y2);
    state->closePath();
    state->clip();
    out->clip(state);
    state->clearPath();
  }
#ifdef USE_CMS
  initDisplayProfile();
#endif
}

Gfx::Gfx(PDFDoc *docA, OutputDev *outA, Dict *resDict,
	 const PDFRectangle *box, const PDFRectangle *cropBox,
	 bool (*abortCheckCbkA)(void *data),
	 void *abortCheckCbkDataA, Gfx *gfxA)
{
  int i;

  doc = docA;
  if (gfxA) {
    xref = gfxA->getXRef();
    formsDrawing = gfxA->formsDrawing;
    charProcDrawing = gfxA->charProcDrawing;
  } else {
    xref = doc->getXRef();
  }
  catalog = doc->getCatalog();
  subPage = true;
  printCommands = globalParams->getPrintCommands();
  profileCommands = globalParams->getProfileCommands();
  mcStack = nullptr;
  parser = nullptr;

  // start the resource stack
  res = new GfxResources(xref, resDict, nullptr);

  // initialize
  out = outA;
  state = new GfxState(72, 72, box, 0, false);
  stackHeight = 1;
  pushStateGuard();
  fontChanged = false;
  clip = clipNone;
  ignoreUndef = 0;
  for (i = 0; i < 6; ++i) {
    baseMatrix[i] = state->getCTM()[i];
  }
  formDepth = 0;
  ocState = true;
  parser = nullptr;
  abortCheckCbk = abortCheckCbkA;
  abortCheckCbkData = abortCheckCbkDataA;

  // set crop box
  if (cropBox) {
    state->moveTo(cropBox->x1, cropBox->y1);
    state->lineTo(cropBox->x2, cropBox->y1);
    state->lineTo(cropBox->x2, cropBox->y2);
    state->lineTo(cropBox->x1, cropBox->y2);
    state->closePath();
    state->clip();
    out->clip(state);
    state->clearPath();
  }
#ifdef USE_CMS
  initDisplayProfile();
#endif
}

#ifdef USE_CMS

#include <lcms2.h>

void Gfx::initDisplayProfile() {
   Object catDict = xref->getCatalog();
   if (catDict.isDict()) {
     Object outputIntents = catDict.dictLookup("OutputIntents");
     if (outputIntents.isArray() && outputIntents.arrayGetLength() == 1) {
          Object firstElement = outputIntents.arrayGet(0);
          if (firstElement.isDict()) {
              Object profile = firstElement.dictLookup("DestOutputProfile");
              if (profile.isStream()) {
                Stream *iccStream = profile.getStream();
                int length = 0;
                unsigned char *profBuf = iccStream->toUnsignedChars(&length, 65536, 65536);
                cmsHPROFILE hp = cmsOpenProfileFromMem(profBuf,length);
                if (hp == nullptr) {
                  error(errSyntaxWarning, -1, "read ICCBased color space profile error");
                } else {
                  state->setDisplayProfile(hp);
                }
                gfree(profBuf);
              }
          }
     }
   }
}

#endif

Gfx::~Gfx() {
  while (stateGuards.size()) {
    popStateGuard();
  }
  if (!subPage) {
    out->endPage();
  }
  // There shouldn't be more saves, but pop them if there were any
  while (state->hasSaves()) {
    error(errSyntaxError, -1, "Found state under last state guard. Popping.");
    restoreState();
  }
  delete state;
  while (res) {
    popResources();
  }
  while (mcStack) {
    popMarkedContent();
  }
}

void Gfx::display(Object *obj, bool topLevel) {
  int i;

  if (obj->isArray()) {
    for (i = 0; i < obj->arrayGetLength(); ++i) {
      Object obj2 = obj->arrayGet(i);
      if (!obj2.isStream()) {
	error(errSyntaxError, -1, "Weird page contents");
	return;
      }
    }
  } else if (!obj->isStream()) {
    error(errSyntaxError, -1, "Weird page contents");
    return;
  }
  parser = new Parser(xref, obj, false);
  go(topLevel);
  delete parser;
  parser = nullptr;
}

void Gfx::go(bool topLevel) {
  Object obj;
  Object args[maxArgs];
  int numArgs, i;
  int lastAbortCheck;

  // scan a sequence of objects
  pushStateGuard();
  updateLevel = 1; // make sure even empty pages trigger a call to dump()
  lastAbortCheck = 0;
  numArgs = 0;
  obj = parser->getObj();
  while (!obj.isEOF()) {
    commandAborted = false;

    // got a command - execute it
    if (obj.isCmd()) {
      if (printCommands) {
	obj.print(stdout);
	for (i = 0; i < numArgs; ++i) {
	  printf(" ");
	  args[i].print(stdout);
	}
	printf("\n");
	fflush(stdout);
      }
      GooTimer *timer = nullptr;

      if (unlikely(profileCommands)) {
          timer = new GooTimer();
      }

      // Run the operation
      execOp(&obj, args, numArgs);

      // Update the profile information
      if (unlikely(profileCommands)) {
	if (auto* const hash = out->getProfileHash()) {
	  auto& data = (*hash)[obj.getCmd()];
	  data.addElement(timer->getElapsed());
	}
	delete timer;
      }
      for (i = 0; i < numArgs; ++i)
	args[i].setToNull(); // Free memory early
      numArgs = 0;

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

      // did the command throw an exception
      if (commandAborted) {
	// don't propogate; recursive drawing comes from Form XObjects which
	// should probably be drawn in a separate context anyway for caching
	commandAborted = false;
	break;
      }

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

    // grab the next object
    obj = parser->getObj();
  }

  // args at end with no command
  if (numArgs > 0) {
    error(errSyntaxError, 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);
    }
  }

  popStateGuard();

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

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

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

  // type check args
  argPtr = args;
  if (op->numArgs >= 0) {
    if (numArgs < op->numArgs) {
      error(errSyntaxError, getPos(), "Too few ({0:d}) args to '{1:s}' operator", numArgs, name);
      commandAborted = true;
      return;
    }
    if (numArgs > op->numArgs) {
#if 0
      error(errSyntaxWarning, getPos(),
	    "Too many ({0:d}) args to '{1:s}' operator", numArgs, name);
#endif
      argPtr += numArgs - op->numArgs;
      numArgs = op->numArgs;
    }
  } else {
    if (numArgs > -op->numArgs) {
      error(errSyntaxError, getPos(), "Too many ({0:d}) args to '{1:s}' operator",
	    numArgs, name);
      return;
    }
  }
  for (i = 0; i < numArgs; ++i) {
    if (!checkArg(&argPtr[i], op->tchk[i])) {
      error(errSyntaxError, getPos(), "Arg #{0:d} to '{1:s}' operator is wrong type ({2:s})",
	    i, name, argPtr[i].getTypeName());
      return;
    }
  }

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

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

  a = -1;
  b = numOps;
  cmp = 0; // make gcc happy
  // 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 nullptr;
  return &opTab[a];
}

bool 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 false;
  }
  return false;
}

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

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

void Gfx::opSave(Object args[], int numArgs) {
  saveState();
}

void Gfx::opRestore(Object args[], int numArgs) {
  restoreState();
}

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 = true;
}

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

  a = args[0].getArray();
  length = a->getLength();
  if (length == 0) {
    dash = nullptr;
  } else {
    dash = (double *)gmallocn(length, sizeof(double));
    bool dummyOk;
    for (i = 0; i < length; ++i) {
      const Object obj = a->get(i);
      dash[i] = obj.getNum(&dummyOk);
    }
  }
  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;
  GfxBlendMode mode;
  bool haveFillOP;
  Function *funcs[4];
  GfxColor backdropColor;
  bool haveBackdropColor;
  bool alpha, isolated, knockout;
  double opac;
  int i;

  obj1 = res->lookupGState(args[0].getName());
  if (obj1.isNull()) {
    return;
  }
  if (!obj1.isDict()) {
    error(errSyntaxError, getPos(), "ExtGState '{0:s}' is wrong type", args[0].getName());
    return;
  }
  if (printCommands) {
    printf("  gfx state dict: ");
    obj1.print();
    printf("\n");
  }

  // parameters that are also set by individual PDF operators
  obj2 = obj1.dictLookup("LW");
  if (obj2.isNum()) {
    opSetLineWidth(&obj2, 1);
  }
  obj2 = obj1.dictLookup("LC");
  if (obj2.isInt()) {
    opSetLineCap(&obj2, 1);
  }
  obj2 = obj1.dictLookup("LJ");
  if (obj2.isInt()) {
    opSetLineJoin(&obj2, 1);
  }
  obj2 = obj1.dictLookup("ML");
  if (obj2.isNum()) {
    opSetMiterLimit(&obj2, 1);
  }
  obj2 = obj1.dictLookup("D");
  if (obj2.isArray() && obj2.arrayGetLength() == 2) {
    Object args2[2];
    args2[0] = obj2.arrayGet(0);
    args2[1] = obj2.arrayGet(1);
    if (args2[0].isArray() && args2[1].isNum()) {
      opSetDash(args2, 2);
    }
  }
#if 0 //~ need to add a new version of GfxResources::lookupFont() that
      //~ takes an indirect ref instead of a name
  if (obj1.dictLookup("Font", &obj2)->isArray() &&
      obj2.arrayGetLength() == 2) {
    obj2.arrayGet(0, &args2[0]);
    obj2.arrayGet(1, &args2[1]);
    if (args2[0].isDict() && args2[1].isNum()) {
      opSetFont(args2, 2);
    }
    args2[0].free();
    args2[1].free();
  }
  obj2.free();
#endif
  obj2 = obj1.dictLookup("FL");
  if (obj2.isNum()) {
    opSetFlat(&obj2, 1);
  }

  // transparency support: blend mode, fill/stroke opacity
  obj2 = obj1.dictLookup("BM");
  if (!obj2.isNull()) {
    if (state->parseBlendMode(&obj2, &mode)) {
      state->setBlendMode(mode);
      out->updateBlendMode(state);
    } else {
      error(errSyntaxError, getPos(), "Invalid blend mode in ExtGState");
    }
  }
  obj2 = obj1.dictLookup("ca");
  if (obj2.isNum()) {
    opac = obj2.getNum();
    state->setFillOpacity(opac < 0 ? 0 : opac > 1 ? 1 : opac);
    out->updateFillOpacity(state);
  }
  obj2 = obj1.dictLookup("CA");
  if (obj2.isNum()) {
    opac = obj2.getNum();
    state->setStrokeOpacity(opac < 0 ? 0 : opac > 1 ? 1 : opac);
    out->updateStrokeOpacity(state);
  }

  // fill/stroke overprint, overprint mode
  obj2 = obj1.dictLookup("op");
  if ((haveFillOP = obj2.isBool())) {
    state->setFillOverprint(obj2.getBool());
    out->updateFillOverprint(state);
  }
  obj2 = obj1.dictLookup("OP");
  if (obj2.isBool()) {
    state->setStrokeOverprint(obj2.getBool());
    out->updateStrokeOverprint(state);
    if (!haveFillOP) {
      state->setFillOverprint(obj2.getBool());
      out->updateFillOverprint(state);
    }
  }
  obj2 = obj1.dictLookup("OPM");
  if (obj2.isInt()) {
    state->setOverprintMode(obj2.getInt());
    out->updateOverprintMode(state);
  }

  // stroke adjust
  obj2 = obj1.dictLookup("SA");
  if (obj2.isBool()) {
    state->setStrokeAdjust(obj2.getBool());
    out->updateStrokeAdjust(state);
  }

  // transfer function
  obj2 = obj1.dictLookup("TR2");
  if (obj2.isNull()) {
    obj2 = obj1.dictLookup("TR");
  }
  if (obj2.isName("Default") ||
      obj2.isName("Identity")) {
    funcs[0] = funcs[1] = funcs[2] = funcs[3] = nullptr;
    state->setTransfer(funcs);
    out->updateTransfer(state);
  } else if (obj2.isArray() && obj2.arrayGetLength() == 4) {
    for (i = 0; i < 4; ++i) {
      Object obj3 = obj2.arrayGet(i);
      funcs[i] = Function::parse(&obj3);
      if (!funcs[i]) {
	break;
      }
    }
    if (i == 4) {
      state->setTransfer(funcs);
      out->updateTransfer(state);
    }
  } else if (obj2.isName() || obj2.isDict() || obj2.isStream()) {
    if ((funcs[0] = Function::parse(&obj2))) {
      funcs[1] = funcs[2] = funcs[3] = nullptr;
      state->setTransfer(funcs);
      out->updateTransfer(state);
    }
  } else if (!obj2.isNull()) {
    error(errSyntaxError, getPos(), "Invalid transfer function in ExtGState");
  }

  // alpha is shape
  obj2 = obj1.dictLookup("AIS");
  if (obj2.isBool()) {
    state->setAlphaIsShape(obj2.getBool());
    out->updateAlphaIsShape(state);
  }

  // text knockout
  obj2 = obj1.dictLookup("TK");
  if (obj2.isBool()) {
    state->setTextKnockout(obj2.getBool());
    out->updateTextKnockout(state);
  }

  // soft mask
  obj2 = obj1.dictLookup("SMask");
  if (!obj2.isNull()) {
    if (obj2.isName("None")) {
      out->clearSoftMask(state);
    } else if (obj2.isDict()) {
      Object obj3 = obj2.dictLookup("S");
      if (obj3.isName("Alpha")) {
	alpha = true;
      } else { // "Luminosity"
	alpha = false;
      }
      funcs[0] = nullptr;
      obj3 = obj2.dictLookup("TR");
      if (!obj3.isNull()) {
	if (obj3.isName("Default") ||
	    obj3.isName("Identity")) {
	  funcs[0] = nullptr;
	} else {
	  funcs[0] = Function::parse(&obj3);
	  if (funcs[0] == nullptr ||
	    funcs[0]->getInputSize() != 1 ||
	    funcs[0]->getOutputSize() != 1) {
	      error(errSyntaxError, getPos(),
		  "Invalid transfer function in soft mask in ExtGState");
	      delete funcs[0];
	      funcs[0] = nullptr;
	  }
	}
      }
      obj3 = obj2.dictLookup("BC");
      if ((haveBackdropColor = obj3.isArray())) {
	for (i = 0; i < gfxColorMaxComps; ++i) {
	  backdropColor.c[i] = 0;
	}
	for (i = 0; i < obj3.arrayGetLength() && i < gfxColorMaxComps; ++i) {
	  Object obj4 = obj3.arrayGet(i);
	  if (obj4.isNum()) {
	    backdropColor.c[i] = dblToCol(obj4.getNum());
	  }
	}
      }
      obj3 = obj2.dictLookup("G");
      if (obj3.isStream()) {
	Object obj4 = obj3.streamGetDict()->lookup("Group");
	if (obj4.isDict()) {
	  GfxColorSpace *blendingColorSpace = nullptr;
	  isolated = knockout = false;
	  Object obj5 = obj4.dictLookup("CS");
	  if (!obj5.isNull()) {
	    blendingColorSpace = GfxColorSpace::parse(res, &obj5, out, state);
	  }
	  obj5 = obj4.dictLookup("I");
	  if (obj5.isBool()) {
	    isolated = obj5.getBool();
	  }
	  obj5 = obj4.dictLookup("K");
	  if (obj5.isBool()) {
	    knockout = obj5.getBool();
	  }
	  if (!haveBackdropColor) {
	    if (blendingColorSpace) {
	      blendingColorSpace->getDefaultColor(&backdropColor);
	    } else {
	      //~ need to get the parent or default color space (?)
	      for (i = 0; i < gfxColorMaxComps; ++i) {
		backdropColor.c[i] = 0;
	      }
	    }
	  }
	  doSoftMask(&obj3, alpha, blendingColorSpace,
		     isolated, knockout, funcs[0], &backdropColor);
	  delete blendingColorSpace;
	} else {
	  error(errSyntaxError, getPos(), "Invalid soft mask in ExtGState - missing group");
	}
      } else {
	error(errSyntaxError, getPos(), "Invalid soft mask in ExtGState - missing group");
      }
      delete funcs[0];
    } else if (!obj2.isNull()) {
      error(errSyntaxError, getPos(), "Invalid soft mask in ExtGState");
    }
  }
  obj2 = obj1.dictLookup("Font");
  if (obj2.isArray()) {
    GfxFont *font;
    if (obj2.arrayGetLength() == 2) {
      const Object &fargs0 = obj2.arrayGetNF(0);
      Object fargs1 = obj2.arrayGet(1);
      if (fargs0.isRef() && fargs1.isNum()) {
	Object fobj = fargs0.fetch(xref);
	if (fobj.isDict()) {
	  Ref r = fargs0.getRef();
	  font = GfxFont::makeFont(xref,args[0].getName(),r,fobj.getDict());
	  state->setFont(font,fargs1.getNum());
	  fontChanged = true;
	}
      }
    } else {
      error(errSyntaxError, getPos(), "Number of args mismatch for /Font in ExtGState");
    }
  }
  obj2 = obj1.dictLookup("LW");
  if (obj2.isNum()) {
    opSetLineWidth(&obj2,1);
  }
  obj2 = obj1.dictLookup("LC");
  if (obj2.isInt()) {
    opSetLineCap(&obj2,1);
  }
  obj2 = obj1.dictLookup("LJ");
  if (obj2.isInt()) {
    opSetLineJoin(&obj2,1);
  }
  obj2 = obj1.dictLookup("ML");
  if (obj2.isNum()) {
    opSetMiterLimit(&obj2,1);
  }
  obj2 = obj1.dictLookup("D");
  if (obj2.isArray()) {
    if (obj2.arrayGetLength() == 2) {
      Object dargs[2];

      dargs[0] = obj2.arrayGetNF(0).copy();
      dargs[1] = obj2.arrayGet(1);
      if (dargs[0].isArray() && dargs[1].isInt()) {
	opSetDash(dargs,2);
      }
    } else {
      error(errSyntaxError, getPos(), "Number of args mismatch for /D in ExtGState");
    }
  }
  obj2 = obj1.dictLookup("RI");
  if (obj2.isName()) {
    opSetRenderingIntent(&obj2,1);
  }
  obj2 = obj1.dictLookup("FL");
  if (obj2.isNum()) {
    opSetFlat(&obj2,1);
  }
}

void Gfx::doSoftMask(Object *str, bool alpha,
		     GfxColorSpace *blendingColorSpace,
		     bool isolated, bool knockout,
		     Function *transferFunc, GfxColor *backdropColor) {
  Dict *dict, *resDict;
  double m[6], bbox[4];
  Object obj1;
  int i;

  // check for excessive recursion
  if (formDepth > 20) {
    return;
  }

  // get stream dict
  dict = str->streamGetDict();

  // check form type
  obj1 = dict->lookup("FormType");
  if (!(obj1.isNull() || (obj1.isInt() && obj1.getInt() == 1))) {
    error(errSyntaxError, getPos(), "Unknown form type");
  }

  // get bounding box
  obj1 = dict->lookup("BBox");
  if (!obj1.isArray()) {
    error(errSyntaxError, getPos(), "Bad form bounding box");
    return;
  }
  for (i = 0; i < 4; ++i) {
    Object obj2 = obj1.arrayGet(i);
    if (likely(obj2.isNum())) bbox[i] = obj2.getNum();
    else {
      error(errSyntaxError, getPos(), "Bad form bounding box (non number)");
      return;
    }
  }

  // get matrix
  obj1 = dict->lookup("Matrix");
  if (obj1.isArray()) {
    for (i = 0; i < 6; ++i) {
      Object obj2 = obj1.arrayGet(i);
      if (likely(obj2.isNum())) m[i] = obj2.getNum();
      else m[i] = 0;
    }
  } else {
    m[0] = 1; m[1] = 0;
    m[2] = 0; m[3] = 1;
    m[4] = 0; m[5] = 0;
  }

  // get resources
  obj1 = dict->lookup("Resources");
  resDict = obj1.isDict() ? obj1.getDict() : nullptr;

  // draw it
  ++formDepth;
  drawForm(str, resDict, m, bbox, true, true,
	  blendingColorSpace, isolated, knockout,
	  alpha, transferFunc, backdropColor);
  --formDepth;
}

void Gfx::opSetRenderingIntent(Object args[], int numArgs) {
  state->setRenderingIntent(args[0].getName());
}

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

void Gfx::opSetFillGray(Object args[], int numArgs) {
  GfxColor color;
  GfxColorSpace *colorSpace = nullptr;

  state->setFillPattern(nullptr);
  Object obj = res->lookupColorSpace("DefaultGray");
  if (!obj.isNull()) {
    colorSpace = GfxColorSpace::parse(res, &obj, out, state);
  }
  if (colorSpace == nullptr) {
    colorSpace = new GfxDeviceGrayColorSpace();
  }
  state->setFillColorSpace(colorSpace);
  out->updateFillColorSpace(state);
  color.c[0] = dblToCol(args[0].getNum());
  state->setFillColor(&color);
  out->updateFillColor(state);
}

void Gfx::opSetStrokeGray(Object args[], int numArgs) {
  GfxColor color;
  GfxColorSpace *colorSpace = nullptr;

  state->setStrokePattern(nullptr);
  Object obj = res->lookupColorSpace("DefaultGray");
  if (!obj.isNull()) {
    colorSpace = GfxColorSpace::parse(res, &obj, out, state);
  }
  if (colorSpace == nullptr) {
    colorSpace = new GfxDeviceGrayColorSpace();
  }
  state->setStrokeColorSpace(colorSpace);
  out->updateStrokeColorSpace(state);
  color.c[0] = dblToCol(args[0].getNum());
  state->setStrokeColor(&color);
  out->updateStrokeColor(state);
}

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

  Object obj = res->lookupColorSpace("DefaultCMYK");
  if (!obj.isNull()) {
    colorSpace = GfxColorSpace::parse(res, &obj, out, state);
  }
  if (colorSpace == nullptr) {
    colorSpace = new GfxDeviceCMYKColorSpace();
  }
  state->setFillPattern(nullptr);
  state->setFillColorSpace(colorSpace);
  out->updateFillColorSpace(state);
  for (i = 0; i < 4; ++i) {
    color.c[i] = dblToCol(args[i].getNum());
  }
  state->setFillColor(&color);
  out->updateFillColor(state);
}

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

  state->setStrokePattern(nullptr);
  Object obj = res->lookupColorSpace("DefaultCMYK");
  if (!obj.isNull()) {
    colorSpace = GfxColorSpace::parse(res, &obj, out, state);
  }
  if (colorSpace == nullptr) {
    colorSpace = new GfxDeviceCMYKColorSpace();
  }
  state->setStrokeColorSpace(colorSpace);
  out->updateStrokeColorSpace(state);
  for (i = 0; i < 4; ++i) {
    color.c[i] = dblToCol(args[i].getNum());
  }
  state->setStrokeColor(&color);
  out->updateStrokeColor(state);
}

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

  state->setFillPattern(nullptr);
  Object obj = res->lookupColorSpace("DefaultRGB");
  if (!obj.isNull()) {
    colorSpace = GfxColorSpace::parse(res, &obj, out, state);
  }
  if (colorSpace == nullptr) {
    colorSpace = new GfxDeviceRGBColorSpace();
  }
  state->setFillColorSpace(colorSpace);
  out->updateFillColorSpace(state);
  for (i = 0; i < 3; ++i) {
    color.c[i] = dblToCol(args[i].getNum());
  }
  state->setFillColor(&color);
  out->updateFillColor(state);
}

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

  state->setStrokePattern(nullptr);
  Object obj = res->lookupColorSpace("DefaultRGB");
  if (!obj.isNull()) {
    colorSpace = GfxColorSpace::parse(res, &obj, out, state);
  }
  if (colorSpace == nullptr) {
    colorSpace = new GfxDeviceRGBColorSpace();
  }
  state->setStrokeColorSpace(colorSpace);
  out->updateStrokeColorSpace(state);
  for (i = 0; i < 3; ++i) {
    color.c[i] = dblToCol(args[i].getNum());
  }
  state->setStrokeColor(&color);
  out->updateStrokeColor(state);
}

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

  Object obj = res->lookupColorSpace(args[0].getName());
  if (obj.isNull()) {
    colorSpace = GfxColorSpace::parse(res, &args[0], out, state);
  } else {
    colorSpace = GfxColorSpace::parse(res, &obj, out, state);
  }
  if (colorSpace) {
    state->setFillPattern(nullptr);
    state->setFillColorSpace(colorSpace);
    out->updateFillColorSpace(state);
    colorSpace->getDefaultColor(&color);
    state->setFillColor(&color);
    out->updateFillColor(state);
  } else {
    error(errSyntaxError, getPos(), "Bad color space (fill)");
  }
}

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

  state->setStrokePattern(nullptr);
  Object obj = res->lookupColorSpace(args[0].getName());
  if (obj.isNull()) {
    colorSpace = GfxColorSpace::parse(res, &args[0], out, state);
  } else {
    colorSpace = GfxColorSpace::parse(res, &obj, out, state);
  }
  if (colorSpace) {
    state->setStrokeColorSpace(colorSpace);
    out->updateStrokeColorSpace(state);
    colorSpace->getDefaultColor(&color);
    state->setStrokeColor(&color);
    out->updateStrokeColor(state);
  } else {
    error(errSyntaxError, getPos(), "Bad color space (stroke)");
  }
}

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

  if (numArgs != state->getFillColorSpace()->getNComps()) {
    error(errSyntaxError, getPos(), "Incorrect number of arguments in 'sc' command");
    return;
  }
  state->setFillPattern(nullptr);
  for (i = 0; i < numArgs; ++i) {
    color.c[i] = dblToCol(args[i].getNum());
  }
  state->setFillColor(&color);
  out->updateFillColor(state);
}

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

  if (numArgs != state->getStrokeColorSpace()->getNComps()) {
    error(errSyntaxError, getPos(), "Incorrect number of arguments in 'SC' command");
    return;
  }
  state->setStrokePattern(nullptr);
  for (i = 0; i < numArgs; ++i) {
    color.c[i] = dblToCol(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) {
      if (!((GfxPatternColorSpace *)state->getFillColorSpace())->getUnder() ||
	  numArgs - 1 != ((GfxPatternColorSpace *)state->getFillColorSpace())
	                     ->getUnder()->getNComps()) {
	error(errSyntaxError, getPos(), "Incorrect number of arguments in 'scn' command");
	return;
      }
      for (i = 0; i < numArgs - 1 && i < gfxColorMaxComps; ++i) {
	if (args[i].isNum()) {
	  color.c[i] = dblToCol(args[i].getNum());
	} else {
	  color.c[i] = 0; // TODO Investigate if this is what Adobe does
	}
      }
      state->setFillColor(&color);
      out->updateFillColor(state);
    }
    if (numArgs > 0) {
      if (args[numArgs-1].isName() &&
	  (pattern = res->lookupPattern(args[numArgs-1].getName(), out, state))) {
        state->setFillPattern(pattern);
      }
    }

  } else {
    if (numArgs != state->getFillColorSpace()->getNComps()) {
      error(errSyntaxError, getPos(), "Incorrect number of arguments in 'scn' command");
      return;
    }
    state->setFillPattern(nullptr);
    for (i = 0; i < numArgs && i < gfxColorMaxComps; ++i) {
      if (args[i].isNum()) {
	color.c[i] = dblToCol(args[i].getNum());
      } else {
        color.c[i] = 0; // TODO Investigate if this is what Adobe does
      }
    }
    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) {
      if (!((GfxPatternColorSpace *)state->getStrokeColorSpace())
	       ->getUnder() ||
	  numArgs - 1 != ((GfxPatternColorSpace *)state->getStrokeColorSpace())
	                     ->getUnder()->getNComps()) {
	error(errSyntaxError, getPos(), "Incorrect number of arguments in 'SCN' command");
	return;
      }
      for (i = 0; i < numArgs - 1 && i < gfxColorMaxComps; ++i) {
	if (args[i].isNum()) {
	  color.c[i] = dblToCol(args[i].getNum());
	} else {
	  color.c[i] = 0; // TODO Investigate if this is what Adobe does
	}
      }
      state->setStrokeColor(&color);
      out->updateStrokeColor(state);
    }
    if (unlikely(numArgs <= 0)) {
      error(errSyntaxError, getPos(), "Incorrect number of arguments in 'SCN' command");
      return;
    }
    if (args[numArgs-1].isName() &&
	(pattern = res->lookupPattern(args[numArgs-1].getName(), out, state))) {
      state->setStrokePattern(pattern);
    }

  } else {
    if (numArgs != state->getStrokeColorSpace()->getNComps()) {
      error(errSyntaxError, getPos(), "Incorrect number of arguments in 'SCN' command");
      return;
    }
    state->setStrokePattern(nullptr);
    for (i = 0; i < numArgs && i < gfxColorMaxComps; ++i) {
      if (args[i].isNum()) {
	color.c[i] = dblToCol(args[i].getNum());
      } else {
        color.c[i] = 0; // TODO Investigate if this is what Adobe does
      }
    }
    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(errSyntaxError, 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(errSyntaxError, 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(errSyntaxError, 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(errSyntaxError, getPos(), "No current point in curveto2");
    return;
  }
  x1 = args[0].getNum();
  y1 = args[1].getNum();
  x2 = args[2].getNum();
  y2 = args[3].getNum();
  x3 = x2;
  y3 = y2;
  state->curveTo(x1, y1, x2, y2, x3, y3);
}

void Gfx::opRectangle(Object args[], int numArgs) {
  double x, y, w, h;

  x = args[0].getNum();
  y = args[1].getNum();
  w = args[2].getNum();
  h = args[3].getNum();
  state->moveTo(x, y);
  state->lineTo(x + w, y);
  state->lineTo(x + w, y + h);
  state->lineTo(x, y + h);
  state->closePath();
}

void Gfx::opClosePath(Object args[], int numArgs) {
  if (!state->isCurPt()) {
    error(errSyntaxError, getPos(), "No current point in closepath");
    return;
  }
  state->closePath();
}

//------------------------------------------------------------------------
// path painting operators
//------------------------------------------------------------------------

void Gfx::opEndPath(Object args[], int numArgs) {
  doEndPath();
}

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

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

void Gfx::opFill(Object args[], int numArgs) {
  if (!state->isCurPt()) {
    //error(errSyntaxError, getPos(), "No path in fill");
    return;
  }
  if (state->isPath()) {
    if (ocState) {
      if (state->getFillColorSpace()->getMode() == csPattern) {
	doPatternFill(false);
      } else {
	out->fill(state);
      }
    }
  }
  doEndPath();
}

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

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

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

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

void Gfx::doPatternFill(bool 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, false, eoFill, false);
    break;
  case 2:
    doShadingPatternFill((GfxShadingPattern *)pattern, false, eoFill, false);
    break;
  default:
    error(errSyntaxError, getPos(), "Unknown pattern type ({0: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, true, false, false);
    break;
  case 2:
    doShadingPatternFill((GfxShadingPattern *)pattern, true, false, false);
    break;
  default:
    error(errSyntaxError, getPos(), "Unknown pattern type ({0:d}) in stroke",
	  pattern->getType());
    break;
  }
}

void Gfx::doPatternText() {
  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, false, false, true);
    break;
  case 2:
    doShadingPatternFill((GfxShadingPattern *)pattern, false, false, true);
    break;
  default:
    error(errSyntaxError, getPos(), "Unknown pattern type ({0:d}) in fill",
	  pattern->getType());
    break;
  }
}

void Gfx::doPatternImageMask(Object *ref, Stream *str, int width, int height,
			     bool invert, bool inlineImg) {
  saveState();

  out->setSoftMaskFromImageMask(state, ref, str,
				width, height, invert, inlineImg, baseMatrix);

  state->clearPath();
  state->moveTo(0, 0);
  state->lineTo(1, 0);
  state->lineTo(1, 1);
  state->lineTo(0, 1);
  state->closePath();
  doPatternText();

  out->unsetSoftMaskFromImageMask(state, baseMatrix);
  restoreState();
}

void Gfx::doTilingPatternFill(GfxTilingPattern *tPat,
			      bool stroke, bool eoFill, bool text) {
  GfxPatternColorSpace *patCS;
  GfxColorSpace *cs;
  GfxColor color;
  GfxState *savedState;
  double xMin, yMin, xMax, yMax, x, y, x1, y1;
  double cxMin, cyMin, cxMax, cyMax;
  int xi0, yi0, xi1, yi1, xi, yi;
  const 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 = ctm[0] * ctm[3] - ctm[1] * ctm[2];
  if (fabs(det) < 0.000001) {
    error(errSyntaxError, getPos(), "Singular matrix in tiling pattern fill");
    return;
  }
  det = 1 / det;
  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 = m1[0] * m1[3] - m1[1] * m1[2];
  if (fabs(det) < 0.000001) {
    error(errSyntaxError, getPos(), "Singular matrix in tiling pattern fill");
    return;
  }
  det = 1 / det;
  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
  savedState = saveStateStack();

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

  // clip to current path
  if (stroke) {
    state->clipToStrokePath();
    out->clipToStrokePath(state);
  } else if (!text) {
    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 restore;
  }

  // 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());
  if (unlikely(xstep == 0 || ystep == 0)) {
      goto restore;
  }
  if (tPat->getBBox()[0] < tPat->getBBox()[2]) {
    xi0 = (int)ceil((xMin - tPat->getBBox()[2]) / xstep);
    xi1 = (int)floor((xMax - tPat->getBBox()[0]) / xstep) + 1;
  } else {
    xi0 = (int)ceil((xMin - tPat->getBBox()[0]) / xstep);
    xi1 = (int)floor((xMax - tPat->getBBox()[2]) / xstep) + 1;
  }
  if (tPat->getBBox()[1] < tPat->getBBox()[3]) {
    yi0 = (int)ceil((yMin - tPat->getBBox()[3]) / ystep);
    yi1 = (int)floor((yMax - tPat->getBBox()[1]) / ystep) + 1;
  } else {
    yi0 = (int)ceil((yMin - tPat->getBBox()[1]) / ystep);
    yi1 = (int)floor((yMax - tPat->getBBox()[3]) / ystep) + 1;
  }
  for (i = 0; i < 4; ++i) {
    m1[i] = m[i];
  }
  m1[4] = m[4];
  m1[5] = m[5];
  {
    bool shouldDrawPattern = true;
    std::set<int>::iterator patternRefIt;
    const int patternRefNum = tPat->getPatternRefNum();
    if (patternRefNum != -1) {
      if (formsDrawing.find(patternRefNum) == formsDrawing.end()) {
	patternRefIt = formsDrawing.insert(patternRefNum).first;
      } else {
	shouldDrawPattern = false;
      }
    }
    if (shouldDrawPattern) {
      if (out->useTilingPatternFill() &&
	  out->tilingPatternFill(state, this, catalog, tPat->getContentStream(),
			tPat->getMatrix(), tPat->getPaintType(), tPat->getTilingType(),
			tPat->getResDict(), m1, tPat->getBBox(),
			xi0, yi0, xi1, yi1, xstep, ystep)) {
	// do nothing
      } else {
	out->updatePatternOpacity(state);
	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];
	    drawForm(tPat->getContentStream(), tPat->getResDict(),
		    m1, tPat->getBBox());
	  }
	}
	out->clearPatternOpacity(state);
      }
      if (patternRefNum != -1) {
	formsDrawing.erase(patternRefIt);
      }
    }
  }

  // restore graphics state
 restore:
  restoreStateStack(savedState);
}

void Gfx::doShadingPatternFill(GfxShadingPattern *sPat,
			       bool stroke, bool eoFill, bool text) {
  GfxShading *shading;
  GfxState *savedState;
  const 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
  savedState = saveStateStack();

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

  // construct a (pattern space) -> (current space) transform matrix
  ctm = state->getCTM();
  btm = baseMatrix;
  ptm = sPat->getMatrix();
  // iCTM = invert CTM
  det = ctm[0] * ctm[3] - ctm[1] * ctm[2];
  if (fabs(det) < 0.000001) {
    error(errSyntaxError, getPos(), "Singular matrix in shading pattern fill");
    restoreStateStack(savedState);
    return;
  }
  det = 1 / det;
  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]);

  // 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);

  // background color fill
  if (shading->getHasBackground()) {
    state->setFillColor(shading->getBackground());
    out->updateFillColor(state);
    state->getUserClipBBox(&xMin, &yMin, &xMax, &yMax);
    state->moveTo(xMin, yMin);
    state->lineTo(xMax, yMin);
    state->lineTo(xMax, yMax);
    state->lineTo(xMin, yMax);
    state->closePath();
    out->fill(state);
    state->clearPath();
  }

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

  // restore graphics state
  restoreStateStack(savedState);
}

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

  if (!ocState) {
    return;
  }

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

  // save current graphics state
  savedState = saveStateStack();

  // 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
  bool vaa = out->getVectorAntialias();
  if (vaa) {
    out->setVectorAntialias(false);
  }
#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(true);
  }
#endif

  // restore graphics state
  restoreStateStack(savedState);

  delete shading;
}

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

  if (out->useShadedFills( shading->getType() ) &&
      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 xM, yM;
  int nComps, i, j;

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

  // compare the four corner colors
  for (i = 0; i < 4; ++i) {
    for (j = 0; j < nComps; ++j) {
      if (abs(colors[i].c[j] - colors[(i+1)&3].c[j]) > functionColorDelta) {
	break;
      }
    }
    if (j < nComps) {
      break;
    }
  }

  // center of the rectangle
  xM = 0.5 * (x0 + x1);
  yM = 0.5 * (y0 + y1);

  // the four corner colors are close (or we hit the recursive limit)
  // -- fill the rectangle; but require at least one subdivision
  // (depth==0) to avoid problems when the four outer corners of the
  // shaded region are the same color
  if ((i == 4 && depth > 0) || depth == functionMaxDepth) {

    // use the center color
    shading->getColor(xM, yM, &fillColor);
    state->setFillColor(&fillColor);
    out->updateFillColor(state);

    // fill the rectangle
    state->moveTo(x0 * matrix[0] + y0 * matrix[2] + matrix[4],
		  x0 * matrix[1] + y0 * matrix[3] + matrix[5]);
    state->lineTo(x1 * matrix[0] + y0 * matrix[2] + matrix[4],
		  x1 * matrix[1] + y0 * matrix[3] + matrix[5]);
    state->lineTo(x1 * matrix[0] + y1 * matrix[2] + matrix[4],
		  x1 * matrix[1] + y1 * matrix[3] + matrix[5]);
    state->lineTo(x0 * matrix[0] + y1 * matrix[2] + matrix[4],
		  x0 * matrix[1] + y1 * matrix[3] + matrix[5]);
    state->closePath();
    out->fill(state);
    state->clearPath();

  // the four corner colors are not close enough -- subdivide the
  // rectangle
  } else {

    // colors[0]       colorM0       colors[2]
    //   (x0,y0)       (xM,y0)       (x1,y0)
    //         +----------+----------+
    //         |          |          |
    //         |    UL    |    UR    |
    // color0M |       colorMM       | color1M
    // (x0,yM) +----------+----------+ (x1,yM)
    //         |       (xM,yM)       |
    //         |    LL    |    LR    |
    //         |          |          |
    //         +----------+----------+
    // colors[1]       colorM1       colors[3]
    //   (x0,y1)       (xM,y1)       (x1,y1)

    shading->getColor(x0, yM, &color0M);
    shading->getColor(x1, yM, &color1M);
    shading->getColor(xM, y0, &colorM0);
    shading->getColor(xM, y1, &colorM1);
    shading->getColor(xM, yM, &colorMM);

    // upper-left sub-rectangle
    colors2[0] = colors[0];
    colors2[1] = color0M;
    colors2[2] = colorM0;
    colors2[3] = colorMM;
    doFunctionShFill1(shading, x0, y0, xM, yM, colors2, depth + 1);
    
    // lower-left sub-rectangle
    colors2[0] = color0M;
    colors2[1] = colors[1];
    colors2[2] = colorMM;
    colors2[3] = colorM1;
    doFunctionShFill1(shading, x0, yM, xM, y1, colors2, depth + 1);
    
    // upper-right sub-rectangle
    colors2[0] = colorM0;
    colors2[1] = colorMM;
    colors2[2] = colors[2];
    colors2[3] = color1M;
    doFunctionShFill1(shading, xM, y0, x1, yM, colors2, depth + 1);

    // lower-right sub-rectangle
    colors2[0] = colorMM;
    colors2[1] = colorM1;
    colors2[2] = color1M;
    colors2[3] = colors[3];
    doFunctionShFill1(shading, xM, yM, x1, y1, colors2, depth + 1);
  }
}

static void bubbleSort(double array[])
{
  for (int j = 0; j < 3; ++j) {
    int kk = j;
    for (int k = j + 1; k < 4; ++k) {
      if (array[k] < array[kk]) {
        kk = k;
      }
    }
    double tmp = array[j];
    array[j] = array[kk];
    array[kk] = tmp;
  }
}

void Gfx::doAxialShFill(GfxAxialShading *shading) {
  double xMin, yMin, xMax, yMax;
  double x0, y0, x1, y1;
  double dx, dy, mul;
  bool dxZero, dyZero;
  double bboxIntersections[4];
  double tMin, tMax, tx, ty;
  double s[4], sMin, sMax, tmp;
  double ux0, uy0, ux1, uy1, vx0, vy0, vx1, vy1;
  double t0, t1, tt;
  double ta[axialMaxSplits + 1];
  int next[axialMaxSplits + 1];
  GfxColor color0 = {}, color1 = {};
  int nComps;
  int i, j, k;
  bool needExtend = true;

  // get the clip region bbox
  state->getUserClipBBox(&xMin, &yMin, &xMax, &yMax);

  // compute min and max t values, based on the four corners of the
  // clip region bbox
  shading->getCoords(&x0, &y0, &x1, &y1);
  dx = x1 - x0;
  dy = y1 - y0;
  dxZero = fabs(dx) < 0.01;
  dyZero = fabs(dy) < 0.01;
  if (dxZero && dyZero) {
    tMin = tMax = 0;
  } else {
    mul = 1 / (dx * dx + dy * dy);
    bboxIntersections[0] = ((xMin - x0) * dx + (yMin - y0) * dy) * mul;
    bboxIntersections[1] = ((xMin - x0) * dx + (yMax - y0) * dy) * mul;
    bboxIntersections[2] = ((xMax - x0) * dx + (yMin - y0) * dy) * mul;
    bboxIntersections[3] = ((xMax - x0) * dx + (yMax - y0) * dy) * mul;
    bubbleSort(bboxIntersections);
    tMin = bboxIntersections[0];
    tMax = bboxIntersections[3];
    if (tMin < 0 && !shading->getExtend0()) {
      tMin = 0;
    }
    if (tMax > 1 && !shading->getExtend1()) {
      tMax = 1;
    }
  }

  if (out->useShadedFills( shading->getType() ) &&
      out->axialShadedFill(state, shading, tMin, tMax)) {
	  return;
  }

  // get the function domain
  t0 = shading->getDomain0();
  t1 = shading->getDomain1();

  // Traverse the t axis and do the shading.
  //
  // For each point (tx, ty) on the t axis, consider a line through
  // that point perpendicular to the t axis:
  //
  //     x(s) = tx + s * -dy   -->   s = (x - tx) / -dy
  //     y(s) = ty + s * dx    -->   s = (y - ty) / dx
  //
  // Then look at the intersection of this line with the bounding box
  // (xMin, yMin, xMax, yMax).  In the general case, there are four
  // intersection points:
  //
  //     s0 = (xMin - tx) / -dy
  //     s1 = (xMax - tx) / -dy
  //     s2 = (yMin - ty) / dx
  //     s3 = (yMax - ty) / dx
  //
  // and we want the middle two s values.
  //
  // In the case where dx = 0, take s0 and s1; in the case where dy =
  // 0, take s2 and s3.
  //
  // Each filled polygon is bounded by two of these line segments
  // perpdendicular to the t axis.
  //
  // The t axis is bisected into smaller regions until the color
  // difference across a region is small enough, and then the region
  // is painted with a single color.

  // set up: require at least one split to avoid problems when the two
  // ends of the t axis have the same color
  nComps = shading->getColorSpace()->getNComps();
  ta[0] = tMin;
  next[0] = axialMaxSplits / 2;
  ta[axialMaxSplits / 2] = 0.5 * (tMin + tMax);
  next[axialMaxSplits / 2] = axialMaxSplits;
  ta[axialMaxSplits] = tMax;

  // compute the color at t = tMin
  if (tMin < 0) {
    tt = t0;
  } else if (tMin > 1) {
    tt = t1;
  } else {
    tt = t0 + (t1 - t0) * tMin;
  }
  shading->getColor(tt, &color0);