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

  "/pdfIm1 {",
  "  /pdfImBuf1 4 index string def",
  "  { currentfile pdfImBuf1 readhexstring pop } image",
  "} def",
  "~1s",
  "/pdfIm1Sep {",
  "  /pdfImBuf1 4 index string def",
  "  /pdfImBuf2 4 index string def",
  "  /pdfImBuf3 4 index string def",
  "  /pdfImBuf4 4 index string def",
  "  { currentfile pdfImBuf1 readhexstring pop }",
  "  { currentfile pdfImBuf2 readhexstring pop }",
  "  { currentfile pdfImBuf3 readhexstring pop }",
  "  { currentfile pdfImBuf4 readhexstring pop }",
  "  true 4 colorimage",
  "} def",
  "~1ns",
  "/pdfImM1 {",
  "  fCol /pdfImBuf1 4 index 7 add 8 idiv string def",
  "  { currentfile pdfImBuf1 readhexstring pop } imagemask",
  "} def",
  "/pdfImM1a {",
  "  { 2 copy get exch 1 add exch } imagemask",
  "  pop pop",
  "} def",
  "~23sn",
  "% Level 2 image operators",
  "/pdfImBuf 100 string def",
  "/pdfIm {",
  "  image",
  "  { currentfile pdfImBuf readline",
  "    not { pop exit } if",
  "    (%-EOD-) eq { exit } if } loop",
  "} def",
  "~23s",
  "/pdfImSep {",
  "  findcmykcustomcolor exch",
  "  dup /Width get /pdfImBuf1 exch string def",
  "  dup /Decode get aload pop 1 index sub /pdfImDecodeRange exch def",
  "  /pdfImDecodeLow exch def",
  "  begin Width Height BitsPerComponent ImageMatrix DataSource end",
  "  /pdfImData exch def",
  "  { pdfImData pdfImBuf1 readstring pop",
  "    0 1 2 index length 1 sub {",
  "      1 index exch 2 copy get",
  "      pdfImDecodeRange mul 255 div pdfImDecodeLow add round cvi",
  "      255 exch sub put",
  "    } for }",
  "  6 5 roll customcolorimage",
  "  { currentfile pdfImBuf readline",
  "    not { pop exit } if",
  "    (%-EOD-) eq { exit } if } loop",
  "} def",
  "~23sn",
  "/pdfImM {",
  "  fCol imagemask",
  "  { currentfile pdfImBuf readline",
  "    not { pop exit } if",
  "    (%-EOD-) eq { exit } if } loop",
  "} def",
  "/pr { 2 index 2 index 3 2 roll putinterval 4 add } def",
  "/pdfImClip {",
  "  gsave",
  "  0 2 4 index length 1 sub {",
  "    dup 4 index exch 2 copy",
  "    get 5 index div put",
  "    1 add 3 index exch 2 copy",
  "    get 3 index div put",
  "  } for",
  "  pop pop rectclip",
  "} def",
  "/pdfImClipEnd { grestore } def",
  "~23sn",
  "% shading operators",
  "/colordelta {",
  "  false 0 1 3 index length 1 sub {",
  "    dup 4 index exch get 3 index 3 2 roll get sub abs 0.004 gt {",
  "      pop true",
  "    } if",
  "  } for",
  "  exch pop exch pop",
  "} def",
  "/funcCol { func n array astore } def",
  "/funcSH {",
  "  dup 0 eq {",
  "    true",
  "  } {",
  "    dup 6 eq {",
  "      false",
  "    } {",
  "      4 index 4 index funcCol dup",
  "      6 index 4 index funcCol dup",
  "      3 1 roll colordelta 3 1 roll",
  "      5 index 5 index funcCol dup",
  "      3 1 roll colordelta 3 1 roll",
  "      6 index 8 index funcCol dup",
  "      3 1 roll colordelta 3 1 roll",
  "      colordelta or or or",
  "    } ifelse",
  "  } ifelse",
  "  {",
  "    1 add",
  "    4 index 3 index add 0.5 mul exch 4 index 3 index add 0.5 mul exch",
  "    6 index 6 index 4 index 4 index 4 index funcSH",
  "    2 index 6 index 6 index 4 index 4 index funcSH",
  "    6 index 2 index 4 index 6 index 4 index funcSH",
  "    5 3 roll 3 2 roll funcSH pop pop",
  "  } {",
  "    pop 3 index 2 index add 0.5 mul 3 index  2 index add 0.5 mul",
  "~23n",
  "    funcCol sc",
  "~23s",
  "    funcCol aload pop k",
  "~23sn",
  "    dup 4 index exch mat transform m",
  "    3 index 3 index mat transform l",
  "    1 index 3 index mat transform l",
  "    mat transform l pop pop h f*",
  "  } ifelse",
  "} def",
  "/axialCol {",
  "  dup 0 lt {",
  "    pop t0",
  "  } {",
  "    dup 1 gt {",
  "      pop t1",
  "    } {",
  "      dt mul t0 add",
  "    } ifelse",
  "  } ifelse",
  "  func n array astore",
  "} def",
  "/axialSH {",
  "  dup 0 eq {",
  "    true",
  "  } {",
  "    dup 8 eq {",
  "      false",
  "    } {",
  "      2 index axialCol 2 index axialCol colordelta",
  "    } ifelse",
  "  } ifelse",
  "  {",
  "    1 add 3 1 roll 2 copy add 0.5 mul",
  "    dup 4 3 roll exch 4 index axialSH",
  "    exch 3 2 roll axialSH",
  "  } {",
  "    pop 2 copy add 0.5 mul",
  "~23n",
  "    axialCol sc",
  "~23s",
  "    axialCol aload pop k",
  "~23sn",
  "    exch dup dx mul x0 add exch dy mul y0 add",
  "    3 2 roll dup dx mul x0 add exch dy mul y0 add",
  "    dx abs dy abs ge {",
  "      2 copy yMin sub dy mul dx div add yMin m",
  "      yMax sub dy mul dx div add yMax l",
  "      2 copy yMax sub dy mul dx div add yMax l",
  "      yMin sub dy mul dx div add yMin l",
  "      h f*",
  "    } {",
  "      exch 2 copy xMin sub dx mul dy div add xMin exch m",
  "      xMax sub dx mul dy div add xMax exch l",
  "      exch 2 copy xMax sub dx mul dy div add xMax exch l",
  "      xMin sub dx mul dy div add xMin exch l",
  "      h f*",
  "    } ifelse",
  "  } ifelse",
  "} def",
  "/radialCol {",
  "  dup t0 lt {",
  "    pop t0",
  "  } {",
  "    dup t1 gt {",
  "      pop t1",
  "    } if",
  "  } ifelse",
  "  func n array astore",
  "} def",
  "/radialSH {",
  "  dup 0 eq {",
  "    true",
  "  } {",
  "    dup 8 eq {",
  "      false",
  "    } {",
  "      2 index dt mul t0 add radialCol",
  "      2 index dt mul t0 add radialCol colordelta",
  "    } ifelse",
  "  } ifelse",
  "  {",
  "    1 add 3 1 roll 2 copy add 0.5 mul",
  "    dup 4 3 roll exch 4 index radialSH",
  "    exch 3 2 roll radialSH",
  "  } {",
  "    pop 2 copy add 0.5 mul dt mul t0 add",
  "~23n",
  "    radialCol sc",
  "~23s",
  "    radialCol aload pop k",
  "~23sn",
  "    encl {",
  "      exch dup dx mul x0 add exch dup dy mul y0 add exch dr mul r0 add",
  "      0 360 arc h",
  "      dup dx mul x0 add exch dup dy mul y0 add exch dr mul r0 add",
  "      360 0 arcn h f",
  "    } {",
  "      2 copy",
  "      dup dx mul x0 add exch dup dy mul y0 add exch dr mul r0 add",
  "      a1 a2 arcn",
  "      dup dx mul x0 add exch dup dy mul y0 add exch dr mul r0 add",
  "      a2 a1 arcn h",
  "      dup dx mul x0 add exch dup dy mul y0 add exch dr mul r0 add",
  "      a1 a2 arc",
  "      dup dx mul x0 add exch dup dy mul y0 add exch dr mul r0 add",
  "      a2 a1 arc h f",
  "    } ifelse",
  "  } ifelse",
  "} def",
  "~123sn",
  "end",
  NULL
};

static char *cmapProlog[] = {
  "/CIDInit /ProcSet findresource begin",
  "10 dict begin",
  "  begincmap",
  "  /CMapType 1 def",
  "  /CMapName /Identity-H def",
  "  /CIDSystemInfo 3 dict dup begin",
  "    /Registry (Adobe) def",
  "    /Ordering (Identity) def",
  "    /Supplement 0 def",
  "  end def",
  "  1 begincodespacerange",
  "    <0000> <ffff>",
  "  endcodespacerange",
  "  0 usefont",
  "  1 begincidrange",
  "    <0000> <ffff> 0",
  "  endcidrange",
  "  endcmap",
  "  currentdict CMapName exch /CMap defineresource pop",
  "end",
  "10 dict begin",
  "  begincmap",
  "  /CMapType 1 def",
  "  /CMapName /Identity-V def",
  "  /CIDSystemInfo 3 dict dup begin",
  "    /Registry (Adobe) def",
  "    /Ordering (Identity) def",
  "    /Supplement 0 def",
  "  end def",
  "  /WMode 1 def",
  "  1 begincodespacerange",
  "    <0000> <ffff>",
  "  endcodespacerange",
  "  0 usefont",
  "  1 begincidrange",
  "    <0000> <ffff> 0",
  "  endcidrange",
  "  endcmap",
  "  currentdict CMapName exch /CMap defineresource pop",
  "end",
  "end",
  NULL
};

//------------------------------------------------------------------------
// Fonts
//------------------------------------------------------------------------

struct PSSubstFont {
  char *psName;			// PostScript name
  double mWidth;		// width of 'm' character
};

static char *psFonts[] = {
  "Courier",
  "Courier-Bold",
  "Courier-Oblique",
  "Courier-BoldOblique",
  "Helvetica",
  "Helvetica-Bold",
  "Helvetica-Oblique",
  "Helvetica-BoldOblique",
  "Symbol",
  "Times-Roman",
  "Times-Bold",
  "Times-Italic",
  "Times-BoldItalic",
  "ZapfDingbats",
  NULL
};

static PSSubstFont psSubstFonts[] = {
  {"Helvetica",             0.833},
  {"Helvetica-Oblique",     0.833},
  {"Helvetica-Bold",        0.889},
  {"Helvetica-BoldOblique", 0.889},
  {"Times-Roman",           0.788},
  {"Times-Italic",          0.722},
  {"Times-Bold",            0.833},
  {"Times-BoldItalic",      0.778},
  {"Courier",               0.600},
  {"Courier-Oblique",       0.600},
  {"Courier-Bold",          0.600},
  {"Courier-BoldOblique",   0.600}
};

// Info for 8-bit fonts
struct PSFont8Info {
  Ref fontID;
  Gushort *codeToGID;		// code-to-GID mapping for TrueType fonts
};

// Encoding info for substitute 16-bit font
struct PSFont16Enc {
  Ref fontID;
  GString *enc;
};

//------------------------------------------------------------------------
// process colors
//------------------------------------------------------------------------

#define psProcessCyan     1
#define psProcessMagenta  2
#define psProcessYellow   4
#define psProcessBlack    8
#define psProcessCMYK    15

//------------------------------------------------------------------------
// PSOutCustomColor
//------------------------------------------------------------------------

class PSOutCustomColor {
public:

  PSOutCustomColor(double cA, double mA,
		   double yA, double kA, GString *nameA);
  ~PSOutCustomColor();

  double c, m, y, k;
  GString *name;
  PSOutCustomColor *next;
};

PSOutCustomColor::PSOutCustomColor(double cA, double mA,
				   double yA, double kA, GString *nameA) {
  c = cA;
  m = mA;
  y = yA;
  k = kA;
  name = nameA;
  next = NULL;
}

PSOutCustomColor::~PSOutCustomColor() {
  delete name;
}

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

struct PSOutImgClipRect {
  int x0, x1, y0, y1;
};

//------------------------------------------------------------------------
// DeviceNRecoder
//------------------------------------------------------------------------

class DeviceNRecoder: public FilterStream {
public:

  DeviceNRecoder(Stream *strA, int widthA, int heightA,
		 GfxImageColorMap *colorMapA);
  virtual ~DeviceNRecoder();
  virtual StreamKind getKind() { return strWeird; }
  virtual void reset();
  virtual int getChar()
    { return (bufIdx >= bufSize && !fillBuf()) ? EOF : buf[bufIdx++]; }
  virtual int lookChar()
    { return (bufIdx >= bufSize && !fillBuf()) ? EOF : buf[bufIdx]; }
  virtual GString *getPSFilter(int psLevel, char *indent) { return NULL; }
  virtual GBool isBinary(GBool last = gTrue) { return gTrue; }
  virtual GBool isEncoder() { return gTrue; }

private:

  GBool fillBuf();

  int width, height;
  GfxImageColorMap *colorMap;
  Function *func;
  ImageStream *imgStr;
  int buf[gfxColorMaxComps];
  int pixelIdx;
  int bufIdx;
  int bufSize;
};

DeviceNRecoder::DeviceNRecoder(Stream *strA, int widthA, int heightA,
			       GfxImageColorMap *colorMapA):
    FilterStream(strA) {
  width = widthA;
  height = heightA;
  colorMap = colorMapA;
  imgStr = NULL;
  pixelIdx = 0;
  bufIdx = gfxColorMaxComps;
  bufSize = ((GfxDeviceNColorSpace *)colorMap->getColorSpace())->
              getAlt()->getNComps();
  func = ((GfxDeviceNColorSpace *)colorMap->getColorSpace())->
           getTintTransformFunc();
}

DeviceNRecoder::~DeviceNRecoder() {
  if (imgStr) {
    delete imgStr;
  }
}

void DeviceNRecoder::reset() {
  imgStr = new ImageStream(str, width, colorMap->getNumPixelComps(),
			   colorMap->getBits());
  imgStr->reset();
}

GBool DeviceNRecoder::fillBuf() {
  Guchar pixBuf[gfxColorMaxComps];
  GfxColor color;
  double x[gfxColorMaxComps], y[gfxColorMaxComps];
  int i;

  if (pixelIdx >= width * height) {
    return gFalse;
  }
  imgStr->getPixel(pixBuf);
  colorMap->getColor(pixBuf, &color);
  for (i = 0;
       i < ((GfxDeviceNColorSpace *)colorMap->getColorSpace())->getNComps();
       ++i) {
    x[i] = colToDbl(color.c[i]);
  }
  func->transform(x, y);
  for (i = 0; i < bufSize; ++i) {
    buf[i] = (int)(y[i] * 255 + 0.5);
  }
  bufIdx = 0;
  ++pixelIdx;
  return gTrue;
}

//------------------------------------------------------------------------
// PSOutputDev
//------------------------------------------------------------------------

extern "C" {
typedef void (*SignalFunc)(int);
}

static void outputToFile(void *stream, char *data, int len) {
  fwrite(data, 1, len, (FILE *)stream);
}

PSOutputDev::PSOutputDev(char *fileName, XRef *xrefA, Catalog *catalog,
			 int firstPage, int lastPage, PSOutMode modeA,
			 int imgLLXA, int imgLLYA, int imgURXA, int imgURYA,
			 GBool manualCtrlA) {
  FILE *f;
  PSFileType fileTypeA;

  underlayCbk = NULL;