psoutputdev.cc

这是一个做pdf阅读器的源代码文件,是大家学习阅读器资料的很好参考

//========================================================================
//
// PSOutputDev.cc
//
// Copyright 1996-2003 Glyph & Cog, LLC
//
//========================================================================

#include <aconf.h>

#ifdef USE_GCC_PRAGMAS
#pragma implementation
#endif

#include <stdio.h>
#include <stddef.h>
#include <stdarg.h>
#include <signal.h>
#include <math.h>
#include "GString.h"
#include "GList.h"
#include "config.h"
#include "GlobalParams.h"
#include "Object.h"
#include "Error.h"
#include "Function.h"
#include "Gfx.h"
#include "GfxState.h"
#include "GfxFont.h"
#include "UnicodeMap.h"
#include "FoFiType1C.h"
#include "FoFiTrueType.h"
#include "Catalog.h"
#include "Page.h"
#include "Stream.h"
#include "Annot.h"
#include "XRef.h"
#include "PreScanOutputDev.h"
#if HAVE_SPLASH
#  include "Splash.h"
#  include "SplashBitmap.h"
#  include "SplashOutputDev.h"
#endif
#include "PSOutputDev.h"

#ifdef MACOS
// needed for setting type/creator of MacOS files
#include "ICSupport.h"
#endif

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

//------------------------------------------------------------------------

// Resolution at which pages with transparency will be rasterized.
#define splashDPI 300

//------------------------------------------------------------------------
// PostScript prolog and setup
//------------------------------------------------------------------------

// The '~' escapes mark prolog code that is emitted only in certain
// levels:
//
//   ~[123][sn]
//      ^   ^----- s=psLevel*Sep, n=psLevel*
//      +----- 1=psLevel1*, 2=psLevel2*, 3=psLevel3*

static char *prolog[] = {
  "/xpdf 75 dict def xpdf begin",
  "% PDF special state",
  "/pdfDictSize 15 def",
  "~1sn",
  "/pdfStates 64 array def",
  "  0 1 63 {",
  "    pdfStates exch pdfDictSize dict",
  "    dup /pdfStateIdx 3 index put",
  "    put",
  "  } for",
  "~123sn",
  "/pdfSetup {",
  "  3 1 roll 2 array astore",
  "  /setpagedevice where {",
  "    pop 3 dict begin",
  "      /PageSize exch def",
  "      /ImagingBBox null def",
  "      /Policies 1 dict dup begin /PageSize 3 def end def",
  "      { /Duplex true def } if",
  "    currentdict end setpagedevice",
  "  } {",
  "    pop pop",
  "  } ifelse",
  "} def",
  "~1sn",
  "/pdfOpNames [",
  "  /pdfFill /pdfStroke /pdfLastFill /pdfLastStroke",
  "  /pdfTextMat /pdfFontSize /pdfCharSpacing /pdfTextRender",
  "  /pdfTextRise /pdfWordSpacing /pdfHorizScaling /pdfTextClipPath",
  "] def",
  "~123sn",
  "/pdfStartPage {",
  "~1sn",
  "  pdfStates 0 get begin",
  "~23sn",
  "  pdfDictSize dict begin",
  "~23n",
  "  /pdfFillCS [] def",
  "  /pdfFillXform {} def",
  "  /pdfStrokeCS [] def",
  "  /pdfStrokeXform {} def",
  "~1n",
  "  /pdfFill 0 def",
  "  /pdfStroke 0 def",
  "~1s",
  "  /pdfFill [0 0 0 1] def",
  "  /pdfStroke [0 0 0 1] def",
  "~23sn",
  "  /pdfFill [0] def",
  "  /pdfStroke [0] def",
  "  /pdfFillOP false def",
  "  /pdfStrokeOP false def",
  "~123sn",
  "  /pdfLastFill false def",
  "  /pdfLastStroke false def",
  "  /pdfTextMat [1 0 0 1 0 0] def",
  "  /pdfFontSize 0 def",
  "  /pdfCharSpacing 0 def",
  "  /pdfTextRender 0 def",
  "  /pdfTextRise 0 def",
  "  /pdfWordSpacing 0 def",
  "  /pdfHorizScaling 1 def",
  "  /pdfTextClipPath [] def",
  "} def",
  "/pdfEndPage { end } def",
  "~23s",
  "% separation convention operators",
  "/findcmykcustomcolor where {",
  "  pop",
  "}{",
  "  /findcmykcustomcolor { 5 array astore } def",
  "} ifelse",
  "/setcustomcolor where {",
  "  pop",
  "}{",
  "  /setcustomcolor {",
  "    exch",
  "    [ exch /Separation exch dup 4 get exch /DeviceCMYK exch",
  "      0 4 getinterval cvx",
  "      [ exch /dup load exch { mul exch dup } /forall load",
  "        /pop load dup ] cvx",
  "    ] setcolorspace setcolor",
  "  } def",
  "} ifelse",
  "/customcolorimage where {",
  "  pop",
  "}{",
  "  /customcolorimage {",
  "    gsave",
  "    [ exch /Separation exch dup 4 get exch /DeviceCMYK exch",
  "      0 4 getinterval",
  "      [ exch /dup load exch { mul exch dup } /forall load",
  "        /pop load dup ] cvx",
  "    ] setcolorspace",
  "    10 dict begin",
  "      /ImageType 1 def",
  "      /DataSource exch def",
  "      /ImageMatrix exch def",
  "      /BitsPerComponent exch def",
  "      /Height exch def",
  "      /Width exch def",
  "      /Decode [1 0] def",
  "    currentdict end",
  "    image",
  "    grestore",
  "  } def",
  "} ifelse",
  "~123sn",
  "% PDF color state",
  "~1n",
  "/g { dup /pdfFill exch def setgray",
  "     /pdfLastFill true def /pdfLastStroke false def } def",
  "/G { dup /pdfStroke exch def setgray",
  "     /pdfLastStroke true def /pdfLastFill false def } def",
  "/fCol {",
  "  pdfLastFill not {",
  "    pdfFill setgray",
  "    /pdfLastFill true def /pdfLastStroke false def",
  "  } if",
  "} def",
  "/sCol {",
  "  pdfLastStroke not {",
  "    pdfStroke setgray",
  "    /pdfLastStroke true def /pdfLastFill false def",
  "  } if",
  "} def",
  "~1s",
  "/k { 4 copy 4 array astore /pdfFill exch def setcmykcolor",
  "     /pdfLastFill true def /pdfLastStroke false def } def",
  "/K { 4 copy 4 array astore /pdfStroke exch def setcmykcolor",
  "     /pdfLastStroke true def /pdfLastFill false def } def",
  "/fCol {",
  "  pdfLastFill not {",
  "    pdfFill aload pop setcmykcolor",
  "    /pdfLastFill true def /pdfLastStroke false def",
  "  } if",
  "} def",
  "/sCol {",
  "  pdfLastStroke not {",
  "    pdfStroke aload pop setcmykcolor",
  "    /pdfLastStroke true def /pdfLastFill false def",
  "  } if",
  "} def",
  "~23n",
  "/cs { /pdfFillXform exch def dup /pdfFillCS exch def",
  "      setcolorspace } def",
  "/CS { /pdfStrokeXform exch def dup /pdfStrokeCS exch def",
  "      setcolorspace } def",
  "/sc { pdfLastFill not { pdfFillCS setcolorspace } if",
  "      dup /pdfFill exch def aload pop pdfFillXform setcolor",
  "     /pdfLastFill true def /pdfLastStroke false def } def",
  "/SC { pdfLastStroke not { pdfStrokeCS setcolorspace } if",
  "      dup /pdfStroke exch def aload pop pdfStrokeXform setcolor",
  "     /pdfLastStroke true def /pdfLastFill false def } def",
  "/op { /pdfFillOP exch def",
  "      pdfLastFill { pdfFillOP setoverprint } if } def",
  "/OP { /pdfStrokeOP exch def",
  "      pdfLastStroke { pdfStrokeOP setoverprint } if } def",
  "/fCol {",
  "  pdfLastFill not {",
  "    pdfFillCS setcolorspace",
  "    pdfFill aload pop pdfFillXform setcolor",
  "    pdfFillOP setoverprint",
  "    /pdfLastFill true def /pdfLastStroke false def",
  "  } if",
  "} def",
  "/sCol {",
  "  pdfLastStroke not {",
  "    pdfStrokeCS setcolorspace",
  "    pdfStroke aload pop pdfStrokeXform setcolor",
  "    pdfStrokeOP setoverprint",
  "    /pdfLastStroke true def /pdfLastFill false def",
  "  } if",
  "} def",
  "~23s",
  "/k { 4 copy 4 array astore /pdfFill exch def setcmykcolor",
  "     /pdfLastFill true def /pdfLastStroke false def } def",
  "/K { 4 copy 4 array astore /pdfStroke exch def setcmykcolor",
  "     /pdfLastStroke true def /pdfLastFill false def } def",
  "/ck { 6 copy 6 array astore /pdfFill exch def",
  "      findcmykcustomcolor exch setcustomcolor",
  "      /pdfLastFill true def /pdfLastStroke false def } def",
  "/CK { 6 copy 6 array astore /pdfStroke exch def",
  "      findcmykcustomcolor exch setcustomcolor",
  "      /pdfLastStroke true def /pdfLastFill false def } def",
  "/op { /pdfFillOP exch def",
  "      pdfLastFill { pdfFillOP setoverprint } if } def",
  "/OP { /pdfStrokeOP exch def",
  "      pdfLastStroke { pdfStrokeOP setoverprint } if } def",
  "/fCol {",
  "  pdfLastFill not {",
  "    pdfFill aload length 4 eq {",
  "      setcmykcolor",
  "    }{",
  "      findcmykcustomcolor exch setcustomcolor",
  "    } ifelse",
  "    pdfFillOP setoverprint",
  "    /pdfLastFill true def /pdfLastStroke false def",
  "  } if",
  "} def",
  "/sCol {",
  "  pdfLastStroke not {",
  "    pdfStroke aload length 4 eq {",
  "      setcmykcolor",
  "    }{",
  "      findcmykcustomcolor exch setcustomcolor",
  "    } ifelse",
  "    pdfStrokeOP setoverprint",
  "    /pdfLastStroke true def /pdfLastFill false def",
  "  } if",
  "} def",
  "~123sn",
  "% build a font",
  "/pdfMakeFont {",
  "  4 3 roll findfont",
  "  4 2 roll matrix scale makefont",
  "  dup length dict begin",
  "    { 1 index /FID ne { def } { pop pop } ifelse } forall",
  "    /Encoding exch def",
  "    currentdict",
  "  end",
  "  definefont pop",
  "} def",
  "/pdfMakeFont16 {",
  "  exch findfont",
  "  dup length dict begin",
  "    { 1 index /FID ne { def } { pop pop } ifelse } forall",
  "    /WMode exch def",
  "    currentdict",
  "  end",
  "  definefont pop",
  "} def",
  "~3sn",
  "/pdfMakeFont16L3 {",
  "  1 index /CIDFont resourcestatus {",
  "    pop pop 1 index /CIDFont findresource /CIDFontType known",
  "  } {",
  "    false",
  "  } ifelse",
  "  {",
  "    0 eq { /Identity-H } { /Identity-V } ifelse",
  "    exch 1 array astore composefont pop",
  "  } {",
  "    pdfMakeFont16",
  "  } ifelse",
  "} def",
  "~123sn",
  "% graphics state operators",
  "~1sn",
  "/q {",
  "  gsave",
  "  pdfOpNames length 1 sub -1 0 { pdfOpNames exch get load } for",
  "  pdfStates pdfStateIdx 1 add get begin",
  "  pdfOpNames { exch def } forall",
  "} def",
  "/Q { end grestore } def",
  "~23sn",
  "/q { gsave pdfDictSize dict begin } def",
  "/Q {",
  "  end grestore",
  "  /pdfLastFill where {",
  "    pop",
  "    pdfLastFill {",
  "      pdfFillOP setoverprint",
  "    } {",
  "      pdfStrokeOP setoverprint",
  "    } ifelse",
  "  } if",
  "} def",
  "~123sn",
  "/cm { concat } def",
  "/d { setdash } def",
  "/i { setflat } def",
  "/j { setlinejoin } def",
  "/J { setlinecap } def",
  "/M { setmiterlimit } def",
  "/w { setlinewidth } def",
  "% path segment operators",
  "/m { moveto } def",
  "/l { lineto } def",
  "/c { curveto } def",
  "/re { 4 2 roll moveto 1 index 0 rlineto 0 exch rlineto",
  "      neg 0 rlineto closepath } def",
  "/h { closepath } def",
  "% path painting operators",
  "/S { sCol stroke } def",
  "/Sf { fCol stroke } def",
  "/f { fCol fill } def",
  "/f* { fCol eofill } def",
  "% clipping operators",
  "/W { clip newpath } def",
  "/W* { eoclip newpath } def",
  "/Ws { strokepath clip newpath } def",
  "% text state operators",
  "/Tc { /pdfCharSpacing exch def } def",
  "/Tf { dup /pdfFontSize exch def",
  "      dup pdfHorizScaling mul exch matrix scale",
  "      pdfTextMat matrix concatmatrix dup 4 0 put dup 5 0 put",
  "      exch findfont exch makefont setfont } def",
  "/Tr { /pdfTextRender exch def } def",
  "/Ts { /pdfTextRise exch def } def",
  "/Tw { /pdfWordSpacing exch def } def",
  "/Tz { /pdfHorizScaling exch def } def",
  "% text positioning operators",
  "/Td { pdfTextMat transform moveto } def",
  "/Tm { /pdfTextMat exch def } def",
  "% text string operators",
  "/cshow where {",
  "  pop",
  "  /cshow2 {",
  "    dup {",
  "      pop pop",
  "      1 string dup 0 3 index put 3 index exec",
  "    } exch cshow",
  "    pop pop",
  "  } def",
  "}{",
  "  /cshow2 {",
  "    currentfont /FontType get 0 eq {",
  "      0 2 2 index length 1 sub {",
  "        2 copy get exch 1 add 2 index exch get",
  "        2 copy exch 256 mul add",
  "        2 string dup 0 6 5 roll put dup 1 5 4 roll put",
  "        3 index exec",
  "      } for",
  "    } {",
  "      dup {",
  "        1 string dup 0 3 index put 3 index exec",
  "      } forall",
  "    } ifelse",
  "    pop pop",
  "  } def",
  "} ifelse",
  "/awcp {", // awidthcharpath
  "  exch {",
  "    false charpath",
  "    5 index 5 index rmoveto",
  "    6 index eq { 7 index 7 index rmoveto } if",
  "  } exch cshow2",
  "  6 {pop} repeat",
  "} def",
  "/Tj {",
  "  fCol",  // because stringwidth has to draw Type 3 chars
  "  1 index stringwidth pdfTextMat idtransform pop",
  "  sub 1 index length dup 0 ne { div } { pop pop 0 } ifelse",
  "  pdfWordSpacing pdfHorizScaling mul 0 pdfTextMat dtransform 32",
  "  4 3 roll pdfCharSpacing pdfHorizScaling mul add 0",
  "  pdfTextMat dtransform",
  "  6 5 roll Tj1",
  "} def",
  "/Tj16 {",
  "  fCol",  // because stringwidth has to draw Type 3 chars
  "  2 index stringwidth pdfTextMat idtransform pop",
  "  sub exch div",
  "  pdfWordSpacing pdfHorizScaling mul 0 pdfTextMat dtransform 32",
  "  4 3 roll pdfCharSpacing pdfHorizScaling mul add 0",
  "  pdfTextMat dtransform",
  "  6 5 roll Tj1",
  "} def",
  "/Tj16V {",
  "  fCol",  // because stringwidth has to draw Type 3 chars
  "  2 index stringwidth pdfTextMat idtransform exch pop",
  "  sub exch div",
  "  0 pdfWordSpacing pdfTextMat dtransform 32",
  "  4 3 roll pdfCharSpacing add 0 exch",
  "  pdfTextMat dtransform",
  "  6 5 roll Tj1",
  "} def",
  "/Tj1 {",
  "  0 pdfTextRise pdfTextMat dtransform rmoveto",
  "  currentpoint 8 2 roll",
  "  pdfTextRender 1 and 0 eq {",
  "    6 copy awidthshow",
  "  } if",
  "  pdfTextRender 3 and dup 1 eq exch 2 eq or {",
  "    7 index 7 index moveto",
  "    6 copy",
  "    currentfont /FontType get 3 eq { fCol } { sCol } ifelse",
  "    false awcp currentpoint stroke moveto",
  "  } if",
  "  pdfTextRender 4 and 0 ne {",
  "    8 6 roll moveto",
  "    false awcp",
  "    /pdfTextClipPath [ pdfTextClipPath aload pop",
  "      {/moveto cvx}",
  "      {/lineto cvx}",
  "      {/curveto cvx}",
  "      {/closepath cvx}",
  "    pathforall ] def",
  "    currentpoint newpath moveto",
  "  } {",
  "    8 {pop} repeat",
  "  } ifelse",
  "  0 pdfTextRise neg pdfTextMat dtransform rmoveto",
  "} def",
  "/TJm { pdfFontSize 0.001 mul mul neg 0",
  "       pdfTextMat dtransform rmoveto } def",
  "/TJmV { pdfFontSize 0.001 mul mul neg 0 exch",
  "        pdfTextMat dtransform rmoveto } def",
  "/Tclip { pdfTextClipPath cvx exec clip newpath",
  "         /pdfTextClipPath [] def } def",
  "~1ns",
  "% Level 1 image operators",
  "~1n",