splashoutputdev.cc

将pdf文档转换为高质量的html文档

  m11 = m11A;
  m12 = m12A;
  m21 = m21A;
  m22 = m22A;
  glyphX = glyphXA;
  glyphY = glyphYA;
  glyphW = glyphWA;
  glyphH = glyphHA;
  if (aa) {
    glyphSize = glyphW * glyphH;
  } else {
    glyphSize = ((glyphW + 7) >> 3) * glyphH;
  }
  cacheAssoc = 8;
  if (glyphSize <= 256) {
    cacheSets = 8;
  } else if (glyphSize <= 512) {
    cacheSets = 4;
  } else if (glyphSize <= 1024) {
    cacheSets = 2;
  } else {
    cacheSets = 1;
  }
  cacheData = (Guchar *)gmallocn(cacheSets * cacheAssoc, glyphSize);
  cacheTags = (T3FontCacheTag *)gmallocn(cacheSets * cacheAssoc,
					 sizeof(T3FontCacheTag));
  for (i = 0; i < cacheSets * cacheAssoc; ++i) {
    cacheTags[i].mru = i & (cacheAssoc - 1);
  }
}

T3FontCache::~T3FontCache() {
  gfree(cacheData);
  gfree(cacheTags);
}

struct T3GlyphStack {
  Gushort code;			// character code
  double x, y;			// position to draw the glyph

  //----- cache info
  T3FontCache *cache;		// font cache for the current font
  T3FontCacheTag *cacheTag;	// pointer to cache tag for the glyph
  Guchar *cacheData;		// pointer to cache data for the glyph

  //----- saved state
  SplashBitmap *origBitmap;
  Splash *origSplash;
  double origCTM4, origCTM5;

  T3GlyphStack *next;		// next object on stack
};

//------------------------------------------------------------------------
// SplashOutputDev
//------------------------------------------------------------------------

SplashOutputDev::SplashOutputDev(SplashColorMode colorModeA,
				 int bitmapRowPadA,
				 GBool reverseVideoA,
				 SplashColorPtr paperColorA,
				 GBool bitmapTopDownA,
				 GBool allowAntialiasA) {
  colorMode = colorModeA;
  bitmapRowPad = bitmapRowPadA;
  bitmapTopDown = bitmapTopDownA;
  allowAntialias = allowAntialiasA;
  reverseVideo = reverseVideoA;
  splashColorCopy(paperColor, paperColorA);

  xref = NULL;

  bitmap = new SplashBitmap(1, 1, bitmapRowPad, colorMode, bitmapTopDown);
  splash = new Splash(bitmap);
  splash->clear(paperColor);

  fontEngine = NULL;

  nT3Fonts = 0;
  t3GlyphStack = NULL;

  font = NULL;
  needFontUpdate = gFalse;
  textClipPath = NULL;
}

SplashOutputDev::~SplashOutputDev() {
  int i;

  for (i = 0; i < nT3Fonts; ++i) {
    delete t3FontCache[i];
  }
  if (fontEngine) {
    delete fontEngine;
  }
  if (splash) {
    delete splash;
  }
  if (bitmap) {
    delete bitmap;
  }
}

void SplashOutputDev::startDoc(XRef *xrefA) {
  int i;

  xref = xrefA;
  if (fontEngine) {
    delete fontEngine;
  }
  fontEngine = new SplashFontEngine(
#if HAVE_T1LIB_H
				    globalParams->getEnableT1lib(),
#endif
#if HAVE_FREETYPE_FREETYPE_H || HAVE_FREETYPE_H
				    globalParams->getEnableFreeType(),
#endif
				    allowAntialias &&
				      globalParams->getAntialias() &&
				      colorMode != splashModeMono1);
  for (i = 0; i < nT3Fonts; ++i) {
    delete t3FontCache[i];
  }
  nT3Fonts = 0;
}

void SplashOutputDev::startPage(int pageNum, GfxState *state) {
  int w, h;
  SplashColor color;

  w = state ? (int)(state->getPageWidth() + 0.5) : 1;
  h = state ? (int)(state->getPageHeight() + 0.5) : 1;
  if (splash) {
    delete splash;
  }
  if (!bitmap || w != bitmap->getWidth() || h != bitmap->getHeight()) {
    if (bitmap) {
      delete bitmap;
    }
    bitmap = new SplashBitmap(w, h, bitmapRowPad, colorMode, bitmapTopDown);
  }
  splash = new Splash(bitmap);
  switch (colorMode) {
  case splashModeMono1:
  case splashModeMono8:
    color[0] = 0;
    break;
  case splashModeRGB8:
  case splashModeBGR8:
    color[0] = color[1] = color[2] = 0;
    break;
  case splashModeAMono8:
    color[0] = 0xff;
    color[1] = 0;
    break;
  case splashModeARGB8:
    color[0] = 255;
    color[1] = color[2] = color[3] = 0;
    break;
  case splashModeBGRA8:
    color[0] = color[1] = color[2] = 0;
    color[3] = 255;
    break;
#if SPLASH_CMYK
  case splashModeCMYK8:
    color[0] = color[1] = color[2] = color[3] = 0;
    break;
  case splashModeACMYK8:
    color[0] = 255;
    color[1] = color[2] = color[3] = color[4] = 0;
    break;
#endif
  }
  splash->setStrokePattern(new SplashSolidColor(color));
  splash->setFillPattern(new SplashSolidColor(color));
  splash->setLineCap(splashLineCapButt);
  splash->setLineJoin(splashLineJoinMiter);
  splash->setLineDash(NULL, 0, 0);
  splash->setMiterLimit(10);
  splash->setFlatness(1);
  splash->clear(paperColor);
}

void SplashOutputDev::endPage() {
}

void SplashOutputDev::drawLink(Link *link, Catalog *catalog) {
  double x1, y1, x2, y2;
  LinkBorderStyle *borderStyle;
  double r, g, b;
  GfxRGB rgb;
  GfxGray gray;
#if SPLASH_CMYK
  GfxCMYK cmyk;
#endif
  double *dash;
  int dashLength;
  SplashCoord dashList[20];
  SplashPath *path;
  int x, y, i;

  link->getRect(&x1, &y1, &x2, &y2);
  borderStyle = link->getBorderStyle();
  if (borderStyle->getWidth() > 0) {
    borderStyle->getColor(&r, &g, &b);
    rgb.r = dblToCol(r);
    rgb.g = dblToCol(g);
    rgb.b = dblToCol(b);
    gray = dblToCol(0.299 * r + 0.587 * g + 0.114 * b);
    if (gray > gfxColorComp1) {
      gray = gfxColorComp1;
    }
#if SPLASH_CMYK
    cmyk.c = gfxColorComp1 - rgb.r;
    cmyk.m = gfxColorComp1 - rgb.g;
    cmyk.y = gfxColorComp1 - rgb.b;
    cmyk.k = 0;
    splash->setStrokePattern(getColor(gray, &rgb, &cmyk));
#else
    splash->setStrokePattern(getColor(gray, &rgb));
#endif
    splash->setLineWidth((SplashCoord)borderStyle->getWidth());
    borderStyle->getDash(&dash, &dashLength);
    if (borderStyle->getType() == linkBorderDashed && dashLength > 0) {
      if (dashLength > 20) {
	dashLength = 20;
      }
      for (i = 0; i < dashLength; ++i) {
	dashList[i] = (SplashCoord)dash[i];
      }
      splash->setLineDash(dashList, dashLength, 0);
    }
    path = new SplashPath();
    if (borderStyle->getType() == linkBorderUnderlined) {
      cvtUserToDev(x1, y1, &x, &y);
      path->moveTo((SplashCoord)x, (SplashCoord)y);
      cvtUserToDev(x2, y1, &x, &y);
      path->lineTo((SplashCoord)x, (SplashCoord)y);
    } else {
      cvtUserToDev(x1, y1, &x, &y);
      path->moveTo((SplashCoord)x, (SplashCoord)y);
      cvtUserToDev(x2, y1, &x, &y);
      path->lineTo((SplashCoord)x, (SplashCoord)y);
      cvtUserToDev(x2, y2, &x, &y);
      path->lineTo((SplashCoord)x, (SplashCoord)y);
      cvtUserToDev(x1, y2, &x, &y);
      path->lineTo((SplashCoord)x, (SplashCoord)y);
      path->close();
    }
    splash->stroke(path);
    delete path;
  }
}

void SplashOutputDev::saveState(GfxState *state) {
  splash->saveState();
}

void SplashOutputDev::restoreState(GfxState *state) {
  splash->restoreState();
  needFontUpdate = gTrue;
}

void SplashOutputDev::updateAll(GfxState *state) {
  updateLineDash(state);
  updateLineJoin(state);
  updateLineCap(state);
  updateLineWidth(state);
  updateFlatness(state);
  updateMiterLimit(state);
  updateFillColor(state);
  updateStrokeColor(state);
  needFontUpdate = gTrue;
}

void SplashOutputDev::updateCTM(GfxState *state, double m11, double m12,
				double m21, double m22,
				double m31, double m32) {
  updateLineDash(state);
  updateLineJoin(state);
  updateLineCap(state);
  updateLineWidth(state);
}

void SplashOutputDev::updateLineDash(GfxState *state) {
  double *dashPattern;
  int dashLength;
  double dashStart;
  SplashCoord dash[20];
  SplashCoord phase;
  int i;

  state->getLineDash(&dashPattern, &dashLength, &dashStart);
  if (dashLength > 20) {
    dashLength = 20;
  }
  for (i = 0; i < dashLength; ++i) {
    dash[i] =  (SplashCoord)state->transformWidth(dashPattern[i]);
    if (dash[i] < 1) {
      dash[i] = 1;
    }
  }
  phase = (SplashCoord)state->transformWidth(dashStart);
  splash->setLineDash(dash, dashLength, phase);
}

void SplashOutputDev::updateFlatness(GfxState *state) {
  splash->setFlatness(state->getFlatness());
}

void SplashOutputDev::updateLineJoin(GfxState *state) {
  splash->setLineJoin(state->getLineJoin());
}

void SplashOutputDev::updateLineCap(GfxState *state) {
  splash->setLineCap(state->getLineCap());
}

void SplashOutputDev::updateMiterLimit(GfxState *state) {
  splash->setMiterLimit(state->getMiterLimit());
}

void SplashOutputDev::updateLineWidth(GfxState *state) {
  splash->setLineWidth(state->getTransformedLineWidth());
}

void SplashOutputDev::updateFillColor(GfxState *state) {
  GfxGray gray;
  GfxRGB rgb;
#if SPLASH_CMYK
  GfxCMYK cmyk;
#endif

  state->getFillGray(&gray);
  state->getFillRGB(&rgb);
#if SPLASH_CMYK
  state->getFillCMYK(&cmyk);
  splash->setFillPattern(getColor(gray, &rgb, &cmyk));
#else
  splash->setFillPattern(getColor(gray, &rgb));
#endif
}

void SplashOutputDev::updateStrokeColor(GfxState *state) 
{
  GfxGray gray;
  GfxRGB rgb;
#if SPLASH_CMYK
  GfxCMYK cmyk;
#endif

  state->getStrokeGray(&gray);
  state->getStrokeRGB(&rgb);
#if SPLASH_CMYK
  state->getStrokeCMYK(&cmyk);
  splash->setStrokePattern(getColor(gray, &rgb, &cmyk));
#else
  splash->setStrokePattern(getColor(gray, &rgb));
#endif
}

#if SPLASH_CMYK
SplashPattern *SplashOutputDev::getColor(GfxGray gray, GfxRGB *rgb,
					 GfxCMYK *cmyk) {
#else
SplashPattern *SplashOutputDev::getColor(GfxGray gray, GfxRGB *rgb) {
#endif
  SplashPattern *pattern;
  SplashColor color0, color1;
  GfxColorComp r, g, b;

  if (reverseVideo) {
    gray = gfxColorComp1 - gray;
    r = gfxColorComp1 - rgb->r;
    g = gfxColorComp1 - rgb->g;
    b = gfxColorComp1 - rgb->b;
  } else {
    r = rgb->r;
    g = rgb->g;
    b = rgb->b;
  }

  pattern = NULL; // make gcc happy
  switch (colorMode) {
  case splashModeMono1:
    color0[0] = 0;
    color1[0] = 1;
    pattern = new SplashHalftone(color0, color1,
				 splash->getScreen()->copy(),
				 (SplashCoord)colToDbl(gray));
    break;
  case splashModeMono8:
    color1[0] = colToByte(gray);
    pattern = new SplashSolidColor(color1);
    break;
  case splashModeAMono8:
    color1[0] = 255;
    color1[1] = colToByte(gray);
    pattern = new SplashSolidColor(color1);
    break;
  case splashModeRGB8:
    color1[0] = colToByte(r);
    color1[1] = colToByte(g);
    color1[2] = colToByte(b);
    pattern = new SplashSolidColor(color1);
    break;
  case splashModeBGR8:
    color1[2] = colToByte(r);
    color1[1] = colToByte(g);
    color1[0] = colToByte(b);
    pattern = new SplashSolidColor(color1);
    break;
  case splashModeARGB8:
    color1[0] = 255;
    color1[1] = colToByte(r);
    color1[2] = colToByte(g);
    color1[3] = colToByte(b);
    pattern = new SplashSolidColor(color1);
    break;
  case splashModeBGRA8:
    color1[3] = 255;
    color1[2] = colToByte(r);
    color1[1] = colToByte(g);
    color1[0] = colToByte(b);
    pattern = new SplashSolidColor(color1);
    break;
#if SPLASH_CMYK
  case splashModeCMYK8:
    color1[0] = colToByte(cmyk->c);
    color1[1] = colToByte(cmyk->m);
    color1[2] = colToByte(cmyk->y);
    color1[3] = colToByte(cmyk->k);
    pattern = new SplashSolidColor(color1);
    break;
  case splashModeACMYK8:
    color1[0] = 255;
    color1[1] = colToByte(cmyk->c);
    color1[2] = colToByte(cmyk->m);
    color1[3] = colToByte(cmyk->y);
    color1[4] = colToByte(cmyk->k);
    pattern = new SplashSolidColor(color1);
    break;
#endif
  }

  return pattern;
}

void SplashOutputDev::updateBlendMode(GfxState *state) {
  splash->setBlendFunc(splashOutBlendFuncs[state->getBlendMode()]);
}

void SplashOutputDev::updateFillOpacity(GfxState *state) {
  splash->setFillAlpha((SplashCoord)state->getFillOpacity());
}

void SplashOutputDev::updateStrokeOpacity(GfxState *state) {
  splash->setStrokeAlpha((SplashCoord)state->getStrokeOpacity());
}

void SplashOutputDev::updateFont(GfxState *state) {
  GfxFont *gfxFont;
  GfxFontType fontType;
  SplashOutFontFileID *id;
  SplashFontFile *fontFile;
  FoFiTrueType *ff;
  Ref embRef;
  Object refObj, strObj;
  GString *tmpFileName, *fileName, *substName;
  FILE *tmpFile;
  Gushort *codeToGID;
  DisplayFontParam *dfp;
  CharCodeToUnicode *ctu;
  double m11, m12, m21, m22, w1, w2;
  SplashCoord mat[4];
  char *name;
  Unicode uBuf[8];
  int c, substIdx, n, code, cmap;

  needFontUpdate = gFalse;
  font = NULL;
  tmpFileName = NULL;
  substIdx = -1;
  dfp = NULL;

  if (!(gfxFont = state->getFont())) {
    goto err1;
  }
  fontType = gfxFont->getType();
  if (fontType == fontType3) {
    goto err1;
  }

  // check the font file cache
  id = new SplashOutFontFileID(gfxFont->getID());
  if ((fontFile = fontEngine->getFontFile(id))) {
    delete id;

  } else {

    // if there is an embedded font, write it to disk
    if (gfxFont->getEmbeddedFontID(&embRef)) {
      if (!openTempFile(&tmpFileName, &tmpFile, "wb", NULL)) {
	error(-1, "Couldn't create temporary font file");
	goto err2;
      }
      refObj.initRef(embRef.num, embRef.gen);
      refObj.fetch(xref, &strObj);
      refObj.free();
      strObj.streamReset();
      while ((c = strObj.streamGetChar()) != EOF) {
	fputc(c, tmpFile);