splashoutputdev.cc

swf文件查看工具,能够看flash文件的格式

//========================================================================
//
// SplashOutputDev.cc
//
// Copyright 2003 Glyph & Cog, LLC
//
//========================================================================

#include <aconf.h>

#ifdef USE_GCC_PRAGMAS
#pragma implementation
#endif

#include <string.h>
#include <unistd.h>
#include <math.h>
#include "gfile.h"
#include "GlobalParams.h"
#include "Error.h"
#include "Object.h"
#include "GfxFont.h"
#include "Link.h"
#include "CharCodeToUnicode.h"
#include "FontEncodingTables.h"
#include "FoFiTrueType.h"
#include "SplashBitmap.h"
#include "SplashGlyphBitmap.h"
#include "SplashPattern.h"
#include "SplashScreen.h"
#include "SplashPath.h"
#include "SplashState.h"
#include "SplashErrorCodes.h"
#include "SplashFontEngine.h"
#include "SplashFont.h"
#include "SplashFontFile.h"
#include "SplashFontFileID.h"
#include "Splash.h"
#include "SplashOutputDev.h"

#ifdef VMS
#if (__VMS_VER < 70000000)
extern "C" int unlink(char *filename);
#endif
#endif

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

// Divide a 16-bit value (in [0, 255*255]) by 255, returning an 8-bit result.
static inline Guchar div255(int x) {
  return (Guchar)((x + (x >> 8) + 0x80) >> 8);
}

//------------------------------------------------------------------------
// Blend functions
//------------------------------------------------------------------------

static void splashOutBlendMultiply(SplashColorPtr src, SplashColorPtr dest,
				   SplashColorPtr blend, SplashColorMode cm) {
  int i;

  for (i = 0; i < splashColorModeNComps[cm]; ++i) {
    blend[i] = (dest[i] * src[i]) / 255;
  }
}

static void splashOutBlendScreen(SplashColorPtr src, SplashColorPtr dest,
				 SplashColorPtr blend, SplashColorMode cm) {
  int i;

  for (i = 0; i < splashColorModeNComps[cm]; ++i) {
    blend[i] = dest[i] + src[i] - (dest[i] * src[i]) / 255;
  }
}

static void splashOutBlendOverlay(SplashColorPtr src, SplashColorPtr dest,
				  SplashColorPtr blend, SplashColorMode cm) {
  int i;

  for (i = 0; i < splashColorModeNComps[cm]; ++i) {
    blend[i] = dest[i] < 0x80
                 ? (src[i] * 2 * dest[i]) / 255
                 : 255 - 2 * ((255 - src[i]) * (255 - dest[i])) / 255;
  }
}

static void splashOutBlendDarken(SplashColorPtr src, SplashColorPtr dest,
				 SplashColorPtr blend, SplashColorMode cm) {
  int i;

  for (i = 0; i < splashColorModeNComps[cm]; ++i) {
    blend[i] = dest[i] < src[i] ? dest[i] : src[i];
  }
}

static void splashOutBlendLighten(SplashColorPtr src, SplashColorPtr dest,
				  SplashColorPtr blend, SplashColorMode cm) {
  int i;

  for (i = 0; i < splashColorModeNComps[cm]; ++i) {
    blend[i] = dest[i] > src[i] ? dest[i] : src[i];
  }
}

static void splashOutBlendColorDodge(SplashColorPtr src, SplashColorPtr dest,
				     SplashColorPtr blend,
				     SplashColorMode cm) {
  int i, x;

  for (i = 0; i < splashColorModeNComps[cm]; ++i) {
    if (src[i] == 255) {
      blend[i] = 255;
    } else {
      x = (dest[i] * 255) / (255 - src[i]);
      blend[i] = x <= 255 ? x : 255;
    }
  }
}

static void splashOutBlendColorBurn(SplashColorPtr src, SplashColorPtr dest,
				    SplashColorPtr blend, SplashColorMode cm) {
  int i, x;

  for (i = 0; i < splashColorModeNComps[cm]; ++i) {
    if (src[i] == 0) {
      blend[i] = 0;
    } else {
      x = ((255 - dest[i]) * 255) / src[i];
      blend[i] = x <= 255 ? 255 - x : 0;
    }
  }
}

static void splashOutBlendHardLight(SplashColorPtr src, SplashColorPtr dest,
				    SplashColorPtr blend, SplashColorMode cm) {
  int i;

  for (i = 0; i < splashColorModeNComps[cm]; ++i) {
    blend[i] = src[i] < 0x80
                 ? (dest[i] * 2 * src[i]) / 255
                 : 255 - 2 * ((255 - dest[i]) * (255 - src[i])) / 255;
  }
}

static void splashOutBlendSoftLight(SplashColorPtr src, SplashColorPtr dest,
				    SplashColorPtr blend, SplashColorMode cm) {
  int i, x;

  for (i = 0; i < splashColorModeNComps[cm]; ++i) {
    if (src[i] < 0x80) {
      blend[i] = dest[i] - (255 - 2 * src[i]) * dest[i] * (255 - dest[i]) /
	         (255 * 255);
    } else {
      if (dest[i] < 0x40) {
	x = (((((16 * dest[i] - 12 * 255) * dest[i]) / 255)
	      + 4 * 255) * dest[i]) / 255;
      } else {
	x = (int)sqrt(255.0 * dest[i]);
      }
      blend[i] = dest[i] + (2 * src[i] - 255) * (x - dest[i]) / 255;
    }
  }
}

static void splashOutBlendDifference(SplashColorPtr src, SplashColorPtr dest,
				     SplashColorPtr blend,
				     SplashColorMode cm) {
  int i;

  for (i = 0; i < splashColorModeNComps[cm]; ++i) {
    blend[i] = dest[i] < src[i] ? src[i] - dest[i] : dest[i] - src[i];
  }
}

static void splashOutBlendExclusion(SplashColorPtr src, SplashColorPtr dest,
				    SplashColorPtr blend, SplashColorMode cm) {
  int i;

  for (i = 0; i < splashColorModeNComps[cm]; ++i) {
    blend[i] = dest[i] + src[i] - (2 * dest[i] * src[i]) / 255;
  }
}

static void cvtRGBToHSV(Guchar r, Guchar g, Guchar b, int *h, int *s, int *v) {
  int cmax, cmid, cmin, x;

  if (r >= g) {
    if (g >= b)      { x = 0; cmax = r; cmid = g; cmin = b; }
    else if (b >= r) { x = 4; cmax = b; cmid = r; cmin = g; }
    else             { x = 5; cmax = r; cmid = b; cmin = g; }
  } else {
    if (r >= b)      { x = 1; cmax = g; cmid = r; cmin = b; }
    else if (g >= b) { x = 2; cmax = g; cmid = b; cmin = r; }
    else             { x = 3; cmax = b; cmid = g; cmin = r; }
  }
  if (cmax == cmin) {
    *h = *s = 0;
  } else {
    *h = x * 60;
    if (x & 1) {
      *h += ((cmax - cmid) * 60) / (cmax - cmin);
    } else {
      *h += ((cmid - cmin) * 60) / (cmax - cmin);
    }
    *s = (255 * (cmax - cmin)) / cmax;
  }
  *v = cmax;
}

static void cvtHSVToRGB(int h, int s, int v, Guchar *r, Guchar *g, Guchar *b) {
  int x, f, cmax, cmid, cmin;

  if (s == 0) {
    *r = *g = *b = v;
  } else {
    x = h / 60;
    f = h % 60;
    cmax = v;
    if (x & 1) {
      cmid = div255(v * 255 - ((s * f) / 60));
    } else {
      cmid = div255(v * (255 - ((s * (60 - f)) / 60)));
    }
    cmin = div255(v * (255 - s));
    switch (x) {
    case 0: *r = cmax; *g = cmid; *b = cmin; break;
    case 1: *g = cmax; *r = cmid; *b = cmin; break;
    case 2: *g = cmax; *b = cmid; *r = cmin; break;
    case 3: *b = cmax; *g = cmid; *r = cmin; break;
    case 4: *b = cmax; *r = cmid; *g = cmin; break;
    case 5: *r = cmax; *b = cmid; *g = cmin; break;
    }
  }
}

static void splashOutBlendHue(SplashColorPtr src, SplashColorPtr dest,
			      SplashColorPtr blend, SplashColorMode cm) {
  int hs, ss, vs, hd, sd, vd;
#if SPLASH_CMYK
  Guchar r, g, b;
#endif

  switch (cm) {
  case splashModeMono1:
  case splashModeMono8:
    blend[0] = dest[0];
    break;
  case splashModeRGB8:
  case splashModeBGR8:
    cvtRGBToHSV(src[0], src[1], src[2], &hs, &ss, &vs);
    cvtRGBToHSV(dest[0], dest[1], dest[2], &hd, &sd, &vd);
    cvtHSVToRGB(hs, sd, vd, &blend[0], &blend[1], &blend[2]);
    break;
#if SPLASH_CMYK
  case splashModeCMYK8:
    //~ (0xff - ...) should be clipped
    cvtRGBToHSV(0xff - (src[0] + src[3]),
		0xff - (src[1] + src[3]),
		0xff - (src[2] + src[3]), &hs, &ss, &vs);
    cvtRGBToHSV(0xff - (dest[0] + dest[3]),
		0xff - (dest[1] + dest[3]),
		0xff - (dest[2] + dest[3]), &hd, &sd, &vd);
    cvtHSVToRGB(hs, sd, vd, &r, &g, &b);
    //~ should do black generation
    blend[0] = 0xff - r;
    blend[1] = 0xff - g;
    blend[2] = 0xff - b;
    blend[3] = 0;
    break;
#endif
  }
}

static void splashOutBlendSaturation(SplashColorPtr src, SplashColorPtr dest,
				     SplashColorPtr blend,
				     SplashColorMode cm) {
  int hs, ss, vs, hd, sd, vd;
#if SPLASH_CMYK
  Guchar r, g, b;
#endif

  switch (cm) {
  case splashModeMono1:
  case splashModeMono8:
    blend[0] = dest[0];
    break;
  case splashModeRGB8:
  case splashModeBGR8:
    cvtRGBToHSV(src[0], src[1], src[2], &hs, &ss, &vs);
    cvtRGBToHSV(dest[0], dest[1], dest[2], &hd, &sd, &vd);
    cvtHSVToRGB(hd, ss, vd, &blend[0], &blend[1], &blend[2]);
    break;
#if SPLASH_CMYK
  case splashModeCMYK8:
    //~ (0xff - ...) should be clipped
    cvtRGBToHSV(0xff - (src[0] + src[3]),
		0xff - (src[1] + src[3]),
		0xff - (src[2] + src[3]), &hs, &ss, &vs);
    cvtRGBToHSV(0xff - (dest[0] + dest[3]),
		0xff - (dest[1] + dest[3]),
		0xff - (dest[2] + dest[3]), &hd, &sd, &vd);
    cvtHSVToRGB(hd, ss, vd, &r, &g, &b);
    //~ should do black generation
    blend[0] = 0xff - r;
    blend[1] = 0xff - g;
    blend[2] = 0xff - b;
    blend[3] = 0;
    break;
#endif
  }
}

static void splashOutBlendColor(SplashColorPtr src, SplashColorPtr dest,
				SplashColorPtr blend, SplashColorMode cm) {
  int hs, ss, vs, hd, sd, vd;
#if SPLASH_CMYK
  Guchar r, g, b;
#endif

  switch (cm) {
  case splashModeMono1:
  case splashModeMono8:
    blend[0] = dest[0];
    break;
  case splashModeRGB8:
  case splashModeBGR8:
    cvtRGBToHSV(src[0], src[1], src[2], &hs, &ss, &vs);
    cvtRGBToHSV(dest[0], dest[1], dest[2], &hd, &sd, &vd);
    cvtHSVToRGB(hs, ss, vd, &blend[0], &blend[1], &blend[2]);
    break;
#if SPLASH_CMYK
  case splashModeCMYK8:
    //~ (0xff - ...) should be clipped
    cvtRGBToHSV(0xff - (src[0] + src[3]),
		0xff - (src[1] + src[3]),
		0xff - (src[2] + src[3]), &hs, &ss, &vs);
    cvtRGBToHSV(0xff - (dest[0] + dest[3]),
		0xff - (dest[1] + dest[3]),
		0xff - (dest[2] + dest[3]), &hd, &sd, &vd);
    cvtHSVToRGB(hs, ss, vd, &r, &g, &b);
    //~ should do black generation
    blend[0] = 0xff - r;
    blend[1] = 0xff - g;
    blend[2] = 0xff - b;
    blend[3] = 0;
    break;
#endif
  }
}

static void splashOutBlendLuminosity(SplashColorPtr src, SplashColorPtr dest,
				     SplashColorPtr blend,
				     SplashColorMode cm) {
  int hs, ss, vs, hd, sd, vd;
#if SPLASH_CMYK
  Guchar r, g, b;
#endif

  switch (cm) {
  case splashModeMono1:
  case splashModeMono8:
    blend[0] = dest[0];
    break;
  case splashModeRGB8:
  case splashModeBGR8:
    cvtRGBToHSV(src[0], src[1], src[2], &hs, &ss, &vs);
    cvtRGBToHSV(dest[0], dest[1], dest[2], &hd, &sd, &vd);
    cvtHSVToRGB(hd, sd, vs, &blend[0], &blend[1], &blend[2]);
    break;
#if SPLASH_CMYK
  case splashModeCMYK8:
    //~ (0xff - ...) should be clipped
    cvtRGBToHSV(0xff - (src[0] + src[3]),
		0xff - (src[1] + src[3]),
		0xff - (src[2] + src[3]), &hs, &ss, &vs);
    cvtRGBToHSV(0xff - (dest[0] + dest[3]),
		0xff - (dest[1] + dest[3]),
		0xff - (dest[2] + dest[3]), &hd, &sd, &vd);
    cvtHSVToRGB(hd, sd, vs, &r, &g, &b);
    //~ should do black generation
    blend[0] = 0xff - r;
    blend[1] = 0xff - g;
    blend[2] = 0xff - b;
    blend[3] = 0;
    break;
#endif
  }
}

// NB: This must match the GfxBlendMode enum defined in GfxState.h.
SplashBlendFunc splashOutBlendFuncs[] = {
  NULL,
  &splashOutBlendMultiply,
  &splashOutBlendScreen,
  &splashOutBlendOverlay,
  &splashOutBlendDarken,
  &splashOutBlendLighten,
  &splashOutBlendColorDodge,
  &splashOutBlendColorBurn,
  &splashOutBlendHardLight,
  &splashOutBlendSoftLight,
  &splashOutBlendDifference,
  &splashOutBlendExclusion,
  &splashOutBlendHue,
  &splashOutBlendSaturation,
  &splashOutBlendColor,
  &splashOutBlendLuminosity
};

//------------------------------------------------------------------------
// Font substitutions
//------------------------------------------------------------------------

struct SplashOutFontSubst {
  char *name;
  double mWidth;
};

// index: {symbolic:12, fixed:8, serif:4, sans-serif:0} + bold*2 + italic
static SplashOutFontSubst splashOutSubstFonts[16] = {
  {"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},
  {"Symbol",                0.576},
  {"Symbol",                0.576},
  {"Symbol",                0.576},
  {"Symbol",                0.576}
};

//------------------------------------------------------------------------
// SplashOutFontFileID
//------------------------------------------------------------------------

class SplashOutFontFileID: public SplashFontFileID {
public:

  SplashOutFontFileID(Ref *rA) { r = *rA; substIdx = -1; }

  ~SplashOutFontFileID() {}

  GBool matches(SplashFontFileID *id) {
    return ((SplashOutFontFileID *)id)->r.num == r.num &&
           ((SplashOutFontFileID *)id)->r.gen == r.gen;
  }

  void setSubstIdx(int substIdxA) { substIdx = substIdxA; }
  int getSubstIdx() { return substIdx; }

private:

  Ref r;
  int substIdx;
};

//------------------------------------------------------------------------
// T3FontCache
//------------------------------------------------------------------------

struct T3FontCacheTag {
  Gushort code;
  Gushort mru;			// valid bit (0x8000) and MRU index
};

class T3FontCache {
public:

  T3FontCache(Ref *fontID, double m11A, double m12A,
	      double m21A, double m22A,
	      int glyphXA, int glyphYA, int glyphWA, int glyphHA,
	      GBool aa, GBool validBBoxA);
  ~T3FontCache();
  GBool matches(Ref *idA, double m11A, double m12A,
		double m21A, double m22A)
    { return fontID.num == idA->num && fontID.gen == idA->gen &&
	     m11 == m11A && m12 == m12A && m21 == m21A && m22 == m22A; }

  Ref fontID;			// PDF font ID
  double m11, m12, m21, m22;	// transform matrix
  int glyphX, glyphY;		// pixel offset of glyph bitmaps
  int glyphW, glyphH;		// size of glyph bitmaps, in pixels
  GBool validBBox;		// false if the bbox was [0 0 0 0]
  int glyphSize;		// size of glyph bitmaps, in bytes
  int cacheSets;		// number of sets in cache
  int cacheAssoc;		// cache associativity (glyphs per set)
  Guchar *cacheData;		// glyph pixmap cache
  T3FontCacheTag *cacheTags;	// cache tags, i.e., char codes
};

T3FontCache::T3FontCache(Ref *fontIDA, double m11A, double m12A,
			 double m21A, double m22A,
			 int glyphXA, int glyphYA, int glyphWA, int glyphHA,
			 GBool validBBoxA, GBool aa) {
  int i;

  fontID = *fontIDA;
  m11 = m11A;
  m12 = m12A;
  m21 = m21A;