gfxstate.cc

swf文件查看工具,能够看flash文件的格式

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

#include <aconf.h>

#ifdef USE_GCC_PRAGMAS
#pragma implementation
#endif

#include <stddef.h>
#include <math.h>
#include <string.h>
#include "gmem.h"
#include "Error.h"
#include "Object.h"
#include "Array.h"
#include "Page.h"
#include "GfxState.h"
#include "cmyk.h"

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

static inline GfxColorComp clip01(GfxColorComp x) {
  return (x < 0) ? 0 : (x > gfxColorComp1) ? gfxColorComp1 : x;
}

static inline double clip01(double x) {
  return (x < 0) ? 0 : (x > 1) ? 1 : x;
}

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

struct GfxBlendModeInfo {
  char *name;
  GfxBlendMode mode;
};

static GfxBlendModeInfo gfxBlendModeNames[] = {
  { "Normal",     gfxBlendNormal },
  { "Compatible", gfxBlendNormal },
  { "Multiply",   gfxBlendMultiply },
  { "Screen",     gfxBlendScreen },
  { "Overlay",    gfxBlendOverlay },
  { "Darken",     gfxBlendDarken },
  { "Lighten",    gfxBlendLighten },
  { "ColorDodge", gfxBlendColorDodge },
  { "ColorBurn",  gfxBlendColorBurn },
  { "HardLight",  gfxBlendHardLight },
  { "SoftLight",  gfxBlendSoftLight },
  { "Difference", gfxBlendDifference },
  { "Exclusion",  gfxBlendExclusion },
  { "Hue",        gfxBlendHue },
  { "Saturation", gfxBlendSaturation },
  { "Color",      gfxBlendColor },
  { "Luminosity", gfxBlendLuminosity }
};

#define nGfxBlendModeNames \
          ((int)((sizeof(gfxBlendModeNames) / sizeof(GfxBlendModeInfo))))

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

// NB: This must match the GfxColorSpaceMode enum defined in
// GfxState.h
static char *gfxColorSpaceModeNames[] = {
  "DeviceGray",
  "CalGray",
  "DeviceRGB",
  "CalRGB",
  "DeviceCMYK",
  "Lab",
  "ICCBased",
  "Indexed",
  "Separation",
  "DeviceN",
  "Pattern"
};

#define nGfxColorSpaceModes ((sizeof(gfxColorSpaceModeNames) / sizeof(char *)))

//------------------------------------------------------------------------
// GfxColorSpace
//------------------------------------------------------------------------

GfxColorSpace::GfxColorSpace() {
}

GfxColorSpace::~GfxColorSpace() {
}

GfxColorSpace *GfxColorSpace::parse(Object *csObj) {
  GfxColorSpace *cs;
  Object obj1;

  cs = NULL;
  if (csObj->isName()) {
    if (csObj->isName("DeviceGray") || csObj->isName("G")) {
      cs = new GfxDeviceGrayColorSpace();
    } else if (csObj->isName("DeviceRGB") || csObj->isName("RGB")) {
      cs = new GfxDeviceRGBColorSpace();
    } else if (csObj->isName("DeviceCMYK") || csObj->isName("CMYK")) {
      cs = new GfxDeviceCMYKColorSpace();
    } else if (csObj->isName("Pattern")) {
      cs = new GfxPatternColorSpace(NULL);
    } else {
      error(-1, "Bad color space '%s'", csObj->getName());
    }
  } else if (csObj->isArray()) {
    csObj->arrayGet(0, &obj1);
    if (obj1.isName("DeviceGray") || obj1.isName("G")) {
      cs = new GfxDeviceGrayColorSpace();
    } else if (obj1.isName("DeviceRGB") || obj1.isName("RGB")) {
      cs = new GfxDeviceRGBColorSpace();
    } else if (obj1.isName("DeviceCMYK") || obj1.isName("CMYK")) {
      cs = new GfxDeviceCMYKColorSpace();
    } else if (obj1.isName("CalGray")) {
      cs = GfxCalGrayColorSpace::parse(csObj->getArray());
    } else if (obj1.isName("CalRGB")) {
      cs = GfxCalRGBColorSpace::parse(csObj->getArray());
    } else if (obj1.isName("Lab")) {
      cs = GfxLabColorSpace::parse(csObj->getArray());
    } else if (obj1.isName("ICCBased")) {
      cs = GfxICCBasedColorSpace::parse(csObj->getArray());
    } else if (obj1.isName("Indexed") || obj1.isName("I")) {
      cs = GfxIndexedColorSpace::parse(csObj->getArray());
    } else if (obj1.isName("Separation")) {
      cs = GfxSeparationColorSpace::parse(csObj->getArray());
    } else if (obj1.isName("DeviceN")) {
      cs = GfxDeviceNColorSpace::parse(csObj->getArray());
    } else if (obj1.isName("Pattern")) {
      cs = GfxPatternColorSpace::parse(csObj->getArray());
    } else {
      error(-1, "Bad color space");
    }
    obj1.free();
  } else {
    error(-1, "Bad color space - expected name or array");
  }
  return cs;
}

void GfxColorSpace::getDefaultRanges(double *decodeLow, double *decodeRange,
				     int maxImgPixel) {
  int i;

  for (i = 0; i < getNComps(); ++i) {
    decodeLow[i] = 0;
    decodeRange[i] = 1;
  }
}

int GfxColorSpace::getNumColorSpaceModes() {
  return nGfxColorSpaceModes;
}

char *GfxColorSpace::getColorSpaceModeName(int idx) {
  return gfxColorSpaceModeNames[idx];
}

//------------------------------------------------------------------------
// GfxDeviceGrayColorSpace
//------------------------------------------------------------------------

GfxDeviceGrayColorSpace::GfxDeviceGrayColorSpace() {
}

GfxDeviceGrayColorSpace::~GfxDeviceGrayColorSpace() {
}

GfxColorSpace *GfxDeviceGrayColorSpace::copy() {
  return new GfxDeviceGrayColorSpace();
}

void GfxDeviceGrayColorSpace::getGray(GfxColor *color, GfxGray *gray) {
  *gray = clip01(color->c[0]);
}

void GfxDeviceGrayColorSpace::getRGB(GfxColor *color, GfxRGB *rgb) {
  rgb->r = rgb->g = rgb->b = clip01(color->c[0]);
}

void GfxDeviceGrayColorSpace::getCMYK(GfxColor *color, GfxCMYK *cmyk) {
  cmyk->c = cmyk->m = cmyk->y = 0;
  cmyk->k = clip01(gfxColorComp1 - color->c[0]);
}

void GfxDeviceGrayColorSpace::getDefaultColor(GfxColor *color) {
  color->c[0] = 0;
}

//------------------------------------------------------------------------
// GfxCalGrayColorSpace
//------------------------------------------------------------------------

GfxCalGrayColorSpace::GfxCalGrayColorSpace() {
  whiteX = whiteY = whiteZ = 1;
  blackX = blackY = blackZ = 0;
  gamma = 1;
}

GfxCalGrayColorSpace::~GfxCalGrayColorSpace() {
}

GfxColorSpace *GfxCalGrayColorSpace::copy() {
  GfxCalGrayColorSpace *cs;

  cs = new GfxCalGrayColorSpace();
  cs->whiteX = whiteX;
  cs->whiteY = whiteY;
  cs->whiteZ = whiteZ;
  cs->blackX = blackX;
  cs->blackY = blackY;
  cs->blackZ = blackZ;
  cs->gamma = gamma;
  return cs;
}

GfxColorSpace *GfxCalGrayColorSpace::parse(Array *arr) {
  GfxCalGrayColorSpace *cs;
  Object obj1, obj2, obj3;

  arr->get(1, &obj1);
  if (!obj1.isDict()) {
    error(-1, "Bad CalGray color space");
    obj1.free();
    return NULL;
  }
  cs = new GfxCalGrayColorSpace();
  if (obj1.dictLookup("WhitePoint", &obj2)->isArray() &&
      obj2.arrayGetLength() == 3) {
    obj2.arrayGet(0, &obj3);
    cs->whiteX = obj3.getNum();
    obj3.free();
    obj2.arrayGet(1, &obj3);
    cs->whiteY = obj3.getNum();
    obj3.free();
    obj2.arrayGet(2, &obj3);
    cs->whiteZ = obj3.getNum();
    obj3.free();
  }
  obj2.free();
  if (obj1.dictLookup("BlackPoint", &obj2)->isArray() &&
      obj2.arrayGetLength() == 3) {
    obj2.arrayGet(0, &obj3);
    cs->blackX = obj3.getNum();
    obj3.free();
    obj2.arrayGet(1, &obj3);
    cs->blackY = obj3.getNum();
    obj3.free();
    obj2.arrayGet(2, &obj3);
    cs->blackZ = obj3.getNum();
    obj3.free();
  }
  obj2.free();
  if (obj1.dictLookup("Gamma", &obj2)->isNum()) {
    cs->gamma = obj2.getNum();
  }
  obj2.free();
  obj1.free();
  return cs;
}

void GfxCalGrayColorSpace::getGray(GfxColor *color, GfxGray *gray) {
  *gray = clip01(color->c[0]);
}

void GfxCalGrayColorSpace::getRGB(GfxColor *color, GfxRGB *rgb) {
  rgb->r = rgb->g = rgb->b = clip01(color->c[0]);
}

void GfxCalGrayColorSpace::getCMYK(GfxColor *color, GfxCMYK *cmyk) {
  cmyk->c = cmyk->m = cmyk->y = 0;
  cmyk->k = clip01(gfxColorComp1 - color->c[0]);
}

void GfxCalGrayColorSpace::getDefaultColor(GfxColor *color) {
  color->c[0] = 0;
}

//------------------------------------------------------------------------
// GfxDeviceRGBColorSpace
//------------------------------------------------------------------------

GfxDeviceRGBColorSpace::GfxDeviceRGBColorSpace() {
}

GfxDeviceRGBColorSpace::~GfxDeviceRGBColorSpace() {
}

GfxColorSpace *GfxDeviceRGBColorSpace::copy() {
  return new GfxDeviceRGBColorSpace();
}

void GfxDeviceRGBColorSpace::getGray(GfxColor *color, GfxGray *gray) {
  *gray = clip01((GfxColorComp)(0.3  * color->c[0] +
				0.59 * color->c[1] +
				0.11 * color->c[2] + 0.5));
}

void GfxDeviceRGBColorSpace::getRGB(GfxColor *color, GfxRGB *rgb) {
  rgb->r = clip01(color->c[0]);
  rgb->g = clip01(color->c[1]);
  rgb->b = clip01(color->c[2]);
}

void GfxDeviceRGBColorSpace::getCMYK(GfxColor *color, GfxCMYK *cmyk) {
  GfxColorComp c, m, y, k;

  c = clip01(gfxColorComp1 - color->c[0]);
  m = clip01(gfxColorComp1 - color->c[1]);
  y = clip01(gfxColorComp1 - color->c[2]);
  k = c;
  if (m < k) {
    k = m;
  }
  if (y < k) {
    k = y;
  }
  cmyk->c = c - k;
  cmyk->m = m - k;
  cmyk->y = y - k;
  cmyk->k = k;
}

void GfxDeviceRGBColorSpace::getDefaultColor(GfxColor *color) {
  color->c[0] = 0;
  color->c[1] = 0;
  color->c[2] = 0;
}

//------------------------------------------------------------------------
// GfxCalRGBColorSpace
//------------------------------------------------------------------------

GfxCalRGBColorSpace::GfxCalRGBColorSpace() {
  whiteX = whiteY = whiteZ = 1;
  blackX = blackY = blackZ = 0;
  gammaR = gammaG = gammaB = 1;
  mat[0] = 1; mat[1] = 0; mat[2] = 0;
  mat[3] = 0; mat[4] = 1; mat[5] = 0;
  mat[6] = 0; mat[7] = 0; mat[8] = 1;
}

GfxCalRGBColorSpace::~GfxCalRGBColorSpace() {
}

GfxColorSpace *GfxCalRGBColorSpace::copy() {
  GfxCalRGBColorSpace *cs;
  int i;

  cs = new GfxCalRGBColorSpace();
  cs->whiteX = whiteX;
  cs->whiteY = whiteY;
  cs->whiteZ = whiteZ;
  cs->blackX = blackX;
  cs->blackY = blackY;
  cs->blackZ = blackZ;
  cs->gammaR = gammaR;
  cs->gammaG = gammaG;
  cs->gammaB = gammaB;
  for (i = 0; i < 9; ++i) {
    cs->mat[i] = mat[i];
  }
  return cs;
}

GfxColorSpace *GfxCalRGBColorSpace::parse(Array *arr) {
  GfxCalRGBColorSpace *cs;
  Object obj1, obj2, obj3;
  int i;

  arr->get(1, &obj1);
  if (!obj1.isDict()) {
    error(-1, "Bad CalRGB color space");
    obj1.free();
    return NULL;
  }
  cs = new GfxCalRGBColorSpace();
  if (obj1.dictLookup("WhitePoint", &obj2)->isArray() &&
      obj2.arrayGetLength() == 3) {
    obj2.arrayGet(0, &obj3);
    cs->whiteX = obj3.getNum();
    obj3.free();
    obj2.arrayGet(1, &obj3);
    cs->whiteY = obj3.getNum();
    obj3.free();
    obj2.arrayGet(2, &obj3);
    cs->whiteZ = obj3.getNum();
    obj3.free();
  }
  obj2.free();
  if (obj1.dictLookup("BlackPoint", &obj2)->isArray() &&
      obj2.arrayGetLength() == 3) {
    obj2.arrayGet(0, &obj3);
    cs->blackX = obj3.getNum();
    obj3.free();
    obj2.arrayGet(1, &obj3);
    cs->blackY = obj3.getNum();
    obj3.free();
    obj2.arrayGet(2, &obj3);
    cs->blackZ = obj3.getNum();
    obj3.free();
  }
  obj2.free();
  if (obj1.dictLookup("Gamma", &obj2)->isArray() &&
      obj2.arrayGetLength() == 3) {
    obj2.arrayGet(0, &obj3);
    cs->gammaR = obj3.getNum();
    obj3.free();
    obj2.arrayGet(1, &obj3);
    cs->gammaG = obj3.getNum();
    obj3.free();
    obj2.arrayGet(2, &obj3);
    cs->gammaB = obj3.getNum();
    obj3.free();
  }
  obj2.free();
  if (obj1.dictLookup("Matrix", &obj2)->isArray() &&
      obj2.arrayGetLength() == 9) {
    for (i = 0; i < 9; ++i) {
      obj2.arrayGet(i, &obj3);
      cs->mat[i] = obj3.getNum();
      obj3.free();
    }
  }
  obj2.free();
  obj1.free();
  return cs;
}

void GfxCalRGBColorSpace::getGray(GfxColor *color, GfxGray *gray) {
  *gray = clip01((GfxColorComp)(0.299 * color->c[0] +
				0.587 * color->c[1] +
				0.114 * color->c[2] + 0.5));
}

void GfxCalRGBColorSpace::getRGB(GfxColor *color, GfxRGB *rgb) {
  rgb->r = clip01(color->c[0]);
  rgb->g = clip01(color->c[1]);
  rgb->b = clip01(color->c[2]);
}

void GfxCalRGBColorSpace::getCMYK(GfxColor *color, GfxCMYK *cmyk) {
  GfxColorComp c, m, y, k;

  c = clip01(gfxColorComp1 - color->c[0]);
  m = clip01(gfxColorComp1 - color->c[1]);
  y = clip01(gfxColorComp1 - color->c[2]);
  k = c;
  if (m < k) {
    k = m;
  }
  if (y < k) {
    k = y;
  }
  cmyk->c = c - k;
  cmyk->m = m - k;
  cmyk->y = y - k;
  cmyk->k = k;
}

void GfxCalRGBColorSpace::getDefaultColor(GfxColor *color) {
  color->c[0] = 0;
  color->c[1] = 0;
  color->c[2] = 0;
}

//------------------------------------------------------------------------
// GfxDeviceCMYKColorSpace
//------------------------------------------------------------------------

GfxDeviceCMYKColorSpace::GfxDeviceCMYKColorSpace() {
}

GfxDeviceCMYKColorSpace::~GfxDeviceCMYKColorSpace() {
}

GfxColorSpace *GfxDeviceCMYKColorSpace::copy() {
  return new GfxDeviceCMYKColorSpace();
}

void GfxDeviceCMYKColorSpace::getGray(GfxColor *color, GfxGray *gray) {
  *gray = clip01((GfxColorComp)(gfxColorComp1 - color->c[3]
				- 0.3  * color->c[0]
				- 0.59 * color->c[1]
				- 0.11 * color->c[2] + 0.5));
}

/*void GfxDeviceCMYKColorSpace::getRGB(GfxColor *color, GfxRGB *rgb) {
    unsigned char r,g,b;
    float c = color->c[0];
    float m = color->c[1];
    float y = color->c[2];
    float k = color->c[3];
    convert_cmyk2rgb(c,m,y,k, &r,&g,&b);
    rgb->r = r/255.0;
    rgb->g = g/255.0;
    rgb->b = b/255.0;
}*/

void GfxDeviceCMYKColorSpace::getRGB(GfxColor *color, GfxRGB *rgb) {
  double c, m, y, k, c1, m1, y1, k1, r, g, b, x;

  c = colToDbl(color->c[0]);
  m = colToDbl(color->c[1]);
  y = colToDbl(color->c[2]);
  k = colToDbl(color->c[3]);
  c1 = 1 - c;
  m1 = 1 - m;
  y1 = 1 - y;
  k1 = 1 - k;
  // this is a matrix multiplication, unrolled for performance
  //                        C M Y K
  x = c1 * m1 * y1 * k1; // 0 0 0 0
  r = g = b = x;
  x = c1 * m1 * y1 * k;  // 0 0 0 1
  r += 0.1373 * x;
  g += 0.1216 * x;
  b += 0.1255 * x;
  x = c1 * m1 * y  * k1; // 0 0 1 0
  r += x;
  g += 0.9490 * x;
  x = c1 * m1 * y  * k;  // 0 0 1 1
  r += 0.1098 * x;
  g += 0.1020 * x;
  x = c1 * m  * y1 * k1; // 0 1 0 0
  r += 0.9255 * x;
  b += 0.5490 * x;