splashoutputdev.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

				       (int)ceil(xMax) - (int)floor(xMin) + 3,
				       (int)ceil(yMax) - (int)floor(yMin) + 3,
				       validBBox,
				       colorMode != splashModeMono1);
    }
  }
  t3Font = t3FontCache[0];

  // is the glyph in the cache?
  i = (code & (t3Font->cacheSets - 1)) * t3Font->cacheAssoc;
  for (j = 0; j < t3Font->cacheAssoc; ++j) {
    if ((t3Font->cacheTags[i+j].mru & 0x8000) &&
	t3Font->cacheTags[i+j].code == code) {
      drawType3Glyph(t3Font, &t3Font->cacheTags[i+j],
		     t3Font->cacheData + (i+j) * t3Font->glyphSize);
      return gTrue;
    }
  }

  // push a new Type 3 glyph record
  t3gs = new T3GlyphStack();
  t3gs->next = t3GlyphStack;
  t3GlyphStack = t3gs;
  t3GlyphStack->code = code;
  t3GlyphStack->cache = t3Font;
  t3GlyphStack->cacheTag = NULL;
  t3GlyphStack->cacheData = NULL;

  return gFalse;
}

void SplashOutputDev::endType3Char(GfxState *state) {
  T3GlyphStack *t3gs;
  double *ctm;

  if (t3GlyphStack->cacheTag) {
    memcpy(t3GlyphStack->cacheData, bitmap->getDataPtr(),
	   t3GlyphStack->cache->glyphSize);
    delete bitmap;
    delete splash;
    bitmap = t3GlyphStack->origBitmap;
    splash = t3GlyphStack->origSplash;
    ctm = state->getCTM();
    state->setCTM(ctm[0], ctm[1], ctm[2], ctm[3],
		  t3GlyphStack->origCTM4, t3GlyphStack->origCTM5);
    updateCTM(state, 0, 0, 0, 0, 0, 0);
    drawType3Glyph(t3GlyphStack->cache,
		   t3GlyphStack->cacheTag, t3GlyphStack->cacheData);
  }
  t3gs = t3GlyphStack;
  t3GlyphStack = t3gs->next;
  delete t3gs;
}

void SplashOutputDev::type3D0(GfxState *state, double wx, double wy) {
}

void SplashOutputDev::type3D1(GfxState *state, double wx, double wy,
			      double llx, double lly, double urx, double ury) {
  double *ctm;
  T3FontCache *t3Font;
  SplashColor color;
  double xt, yt, xMin, xMax, yMin, yMax, x1, y1;
  int i, j;

  t3Font = t3GlyphStack->cache;

  // check for a valid bbox
  state->transform(0, 0, &xt, &yt);
  state->transform(llx, lly, &x1, &y1);
  xMin = xMax = x1;
  yMin = yMax = y1;
  state->transform(llx, ury, &x1, &y1);
  if (x1 < xMin) {
    xMin = x1;
  } else if (x1 > xMax) {
    xMax = x1;
  }
  if (y1 < yMin) {
    yMin = y1;
  } else if (y1 > yMax) {
    yMax = y1;
  }
  state->transform(urx, lly, &x1, &y1);
  if (x1 < xMin) {
    xMin = x1;
  } else if (x1 > xMax) {
    xMax = x1;
  }
  if (y1 < yMin) {
    yMin = y1;
  } else if (y1 > yMax) {
    yMax = y1;
  }
  state->transform(urx, ury, &x1, &y1);
  if (x1 < xMin) {
    xMin = x1;
  } else if (x1 > xMax) {
    xMax = x1;
  }
  if (y1 < yMin) {
    yMin = y1;
  } else if (y1 > yMax) {
    yMax = y1;
  }
  if (xMin - xt < t3Font->glyphX ||
      yMin - yt < t3Font->glyphY ||
      xMax - xt > t3Font->glyphX + t3Font->glyphW ||
      yMax - yt > t3Font->glyphY + t3Font->glyphH) {
    if (t3Font->validBBox) {
      error(-1, "Bad bounding box in Type 3 glyph");
    }
    return;
  }

  // allocate a cache entry
  i = (t3GlyphStack->code & (t3Font->cacheSets - 1)) * t3Font->cacheAssoc;
  for (j = 0; j < t3Font->cacheAssoc; ++j) {
    if ((t3Font->cacheTags[i+j].mru & 0x7fff) == t3Font->cacheAssoc - 1) {
      t3Font->cacheTags[i+j].mru = 0x8000;
      t3Font->cacheTags[i+j].code = t3GlyphStack->code;
      t3GlyphStack->cacheTag = &t3Font->cacheTags[i+j];
      t3GlyphStack->cacheData = t3Font->cacheData + (i+j) * t3Font->glyphSize;
    } else {
      ++t3Font->cacheTags[i+j].mru;
    }
  }

  // save state
  t3GlyphStack->origBitmap = bitmap;
  t3GlyphStack->origSplash = splash;
  ctm = state->getCTM();
  t3GlyphStack->origCTM4 = ctm[4];
  t3GlyphStack->origCTM5 = ctm[5];

  // create the temporary bitmap
  if (colorMode == splashModeMono1) {
    bitmap = new SplashBitmap(t3Font->glyphW, t3Font->glyphH, 1,
			      splashModeMono1, gFalse);
    splash = new Splash(bitmap, gFalse,
			t3GlyphStack->origSplash->getScreen());
    color[0] = 0;
    splash->clear(color);
    color[0] = 1;
  } else {
    bitmap = new SplashBitmap(t3Font->glyphW, t3Font->glyphH, 1,
			      splashModeMono8, gFalse);
    splash = new Splash(bitmap, vectorAntialias,
			t3GlyphStack->origSplash->getScreen());
    color[0] = 0x00;
    splash->clear(color);
    color[0] = 0xff;
  }
  splash->setFillPattern(new SplashSolidColor(color));
  splash->setStrokePattern(new SplashSolidColor(color));
  //~ this should copy other state from t3GlyphStack->origSplash?
  state->setCTM(ctm[0], ctm[1], ctm[2], ctm[3],
		-t3Font->glyphX, -t3Font->glyphY);
  updateCTM(state, 0, 0, 0, 0, 0, 0);
}

void SplashOutputDev::drawType3Glyph(T3FontCache *t3Font,
				     T3FontCacheTag *tag, Guchar *data) {
  SplashGlyphBitmap glyph;

  glyph.x = -t3Font->glyphX;
  glyph.y = -t3Font->glyphY;
  glyph.w = t3Font->glyphW;
  glyph.h = t3Font->glyphH;
  glyph.aa = colorMode != splashModeMono1;
  glyph.data = data;
  glyph.freeData = gFalse;
  splash->fillGlyph(0, 0, &glyph);
}

void SplashOutputDev::endTextObject(GfxState *state) {
  if (textClipPath) {
    splash->clipToPath(textClipPath, gFalse);
    delete textClipPath;
    textClipPath = NULL;
  }
}

struct SplashOutImageMaskData {
  ImageStream *imgStr;
  GBool invert;
  int width, height, y;
};

GBool SplashOutputDev::imageMaskSrc(void *data, SplashColorPtr line) {
  SplashOutImageMaskData *imgMaskData = (SplashOutImageMaskData *)data;
  Guchar *p;
  SplashColorPtr q;
  int x;

  if (imgMaskData->y == imgMaskData->height) {
    return gFalse;
  }
  for (x = 0, p = imgMaskData->imgStr->getLine(), q = line;
       x < imgMaskData->width;
       ++x) {
    *q++ = *p++ ^ imgMaskData->invert;
  }
  ++imgMaskData->y;
  return gTrue;
}

void SplashOutputDev::drawImageMask(GfxState *state, Object *ref, Stream *str,
				    int width, int height, GBool invert,
				    GBool inlineImg) {
  double *ctm;
  SplashCoord mat[6];
  SplashOutImageMaskData imgMaskData;

  if (state->getFillColorSpace()->isNonMarking()) {
    return;
  }

  ctm = state->getCTM();
  mat[0] = ctm[0];
  mat[1] = ctm[1];
  mat[2] = -ctm[2];
  mat[3] = -ctm[3];
  mat[4] = ctm[2] + ctm[4];
  mat[5] = ctm[3] + ctm[5];

  imgMaskData.imgStr = new ImageStream(str, width, 1, 1);
  imgMaskData.imgStr->reset();
  imgMaskData.invert = invert ? 0 : 1;
  imgMaskData.width = width;
  imgMaskData.height = height;
  imgMaskData.y = 0;

  splash->fillImageMask(&imageMaskSrc, &imgMaskData, width, height, mat,
			t3GlyphStack != NULL);
  if (inlineImg) {
    while (imgMaskData.y < height) {
      imgMaskData.imgStr->getLine();
      ++imgMaskData.y;
    }
  }

  delete imgMaskData.imgStr;
  str->close();
}

struct SplashOutImageData {
  ImageStream *imgStr;
  GfxImageColorMap *colorMap;
  SplashColorPtr lookup;
  int *maskColors;
  SplashColorMode colorMode;
  int width, height, y;
};

GBool SplashOutputDev::imageSrc(void *data, SplashColorPtr colorLine,
				Guchar *alphaLine) {
  SplashOutImageData *imgData = (SplashOutImageData *)data;
  Guchar *p;
  SplashColorPtr q, col;
  GfxRGB rgb;
  GfxGray gray;
#if SPLASH_CMYK
  GfxCMYK cmyk;
#endif
  int nComps, x;

  if (imgData->y == imgData->height) {
    return gFalse;
  }

  nComps = imgData->colorMap->getNumPixelComps();

  if (imgData->lookup) {
    switch (imgData->colorMode) {
    case splashModeMono1:
    case splashModeMono8:
      for (x = 0, p = imgData->imgStr->getLine(), q = colorLine;
	   x < imgData->width;
	   ++x, ++p) {
	*q++ = imgData->lookup[*p];
      }
      break;
    case splashModeRGB8:
    case splashModeBGR8:
      for (x = 0, p = imgData->imgStr->getLine(), q = colorLine;
	   x < imgData->width;
	   ++x, ++p) {
	col = &imgData->lookup[3 * *p];
	*q++ = col[0];
	*q++ = col[1];
	*q++ = col[2];
      }
      break;
#if SPLASH_CMYK
    case splashModeCMYK8:
      for (x = 0, p = imgData->imgStr->getLine(), q = colorLine;
	   x < imgData->width;
	   ++x, ++p) {
	col = &imgData->lookup[4 * *p];
	*q++ = col[0];
	*q++ = col[1];
	*q++ = col[2];
	*q++ = col[3];
      }
      break;
#endif
    }
  } else {
    switch (imgData->colorMode) {
    case splashModeMono1:
    case splashModeMono8:
      for (x = 0, p = imgData->imgStr->getLine(), q = colorLine;
	   x < imgData->width;
	   ++x, p += nComps) {
	imgData->colorMap->getGray(p, &gray);
	*q++ = colToByte(gray);
      }
      break;
    case splashModeRGB8:
    case splashModeBGR8:
      for (x = 0, p = imgData->imgStr->getLine(), q = colorLine;
	   x < imgData->width;
	   ++x, p += nComps) {
	imgData->colorMap->getRGB(p, &rgb);
	*q++ = colToByte(rgb.r);
	*q++ = colToByte(rgb.g);
	*q++ = colToByte(rgb.b);
      }
      break;
#if SPLASH_CMYK
    case splashModeCMYK8:
      for (x = 0, p = imgData->imgStr->getLine(), q = colorLine;
	   x < imgData->width;
	   ++x, p += nComps) {
	imgData->colorMap->getCMYK(p, &cmyk);
	*q++ = colToByte(cmyk.c);
	*q++ = colToByte(cmyk.m);
	*q++ = colToByte(cmyk.y);
	*q++ = colToByte(cmyk.k);
      }
      break;
#endif
    }
  }

  ++imgData->y;
  return gTrue;
}

GBool SplashOutputDev::alphaImageSrc(void *data, SplashColorPtr colorLine,
				     Guchar *alphaLine) {
  SplashOutImageData *imgData = (SplashOutImageData *)data;
  Guchar *p, *aq;
  SplashColorPtr q, col;
  GfxRGB rgb;
  GfxGray gray;
#if SPLASH_CMYK
  GfxCMYK cmyk;
#endif
  Guchar alpha;
  int nComps, x, i;

  if (imgData->y == imgData->height) {
    return gFalse;
  }

  nComps = imgData->colorMap->getNumPixelComps();

  for (x = 0, p = imgData->imgStr->getLine(), q = colorLine, aq = alphaLine;
       x < imgData->width;
       ++x, p += nComps) {
    alpha = 0;
    for (i = 0; i < nComps; ++i) {
      if (p[i] < imgData->maskColors[2*i] ||
	  p[i] > imgData->maskColors[2*i+1]) {
	alpha = 0xff;
	break;
      }
    }
    if (imgData->lookup) {
      switch (imgData->colorMode) {
      case splashModeMono1:
      case splashModeMono8:
	*q++ = imgData->lookup[*p];
	*aq++ = alpha;
	break;
      case splashModeRGB8:
      case splashModeBGR8:
	col = &imgData->lookup[3 * *p];
	*q++ = col[0];
	*q++ = col[1];
	*q++ = col[2];
	*aq++ = alpha;
	break;
#if SPLASH_CMYK
      case splashModeCMYK8:
	col = &imgData->lookup[4 * *p];
	*q++ = col[0];
	*q++ = col[1];
	*q++ = col[2];
	*q++ = col[3];
	*aq++ = alpha;
	break;
#endif
      }
    } else {
      switch (imgData->colorMode) {
      case splashModeMono1:
      case splashModeMono8:
	imgData->colorMap->getGray(p, &gray);
	*q++ = colToByte(gray);
	*aq++ = alpha;
	break;
      case splashModeRGB8:
      case splashModeBGR8:
	imgData->colorMap->getRGB(p, &rgb);
	*q++ = colToByte(rgb.r);
	*q++ = colToByte(rgb.g);
	*q++ = colToByte(rgb.b);
	*aq++ = alpha;
	break;
#if SPLASH_CMYK
      case splashModeCMYK8:
	imgData->colorMap->getCMYK(p, &cmyk);
	*q++ = colToByte(cmyk.c);
	*q++ = colToByte(cmyk.m);
	*q++ = colToByte(cmyk.y);
	*q++ = colToByte(cmyk.k);
	*aq++ = alpha;
	break;
#endif
      }
    }
  }

  ++imgData->y;
  return gTrue;
}

void SplashOutputDev::drawImage(GfxState *state, Object *ref, Stream *str,
				int width, int height,
				GfxImageColorMap *colorMap,
				int *maskColors, GBool inlineImg) {
  double *ctm;
  SplashCoord mat[6];
  SplashOutImageData imgData;
  SplashColorMode srcMode;
  SplashImageSource src;
  GfxGray gray;
  GfxRGB rgb;
#if SPLASH_CMYK
  GfxCMYK cmyk;
#endif
  Guchar pix;
  int n, i;

  ctm = state->getCTM();
  mat[0] = ctm[0];
  mat[1] = ctm[1];
  mat[2] = -ctm[2];
  mat[3] = -ctm[3];
  mat[4] = ctm[2] + ctm[4];
  mat[5] = ctm[3] + ctm[5];

  imgData.imgStr = new ImageStream(str, width,
				   colorMap->getNumPixelComps(),
				   colorMap->getBits());
  imgData.imgStr->reset();
  imgData.colorMap = colorMap;
  imgData.maskColors = maskColors;
  imgData.colorMode = colorMode;
  imgData.width = width;
  imgData.height = height;
  imgData.y = 0;

  // special case for one-channel (monochrome/gray/separation) images:
  // build a lookup table here
  imgData.lookup = NULL;
  if (colorMap->getNumPixelComps() == 1) {
    n = 1 << colorMap->getBits();
    switch (colorMode) {
    case splashModeMono1:
    case splashModeMono8:
      imgData.lookup = (SplashColorPtr)gmalloc(n);
      for (i = 0; i < n; ++i) {
	pix = (Guchar)i;
	colorMap->getGray(&pix, &gray);
	imgData.lookup[i] = colToByte(gray);
      }
      break;
    case splashModeRGB8:
    case splashModeBGR8:
      imgData.lookup = (SplashColorPtr)gmalloc(3 * n);
      for (i = 0; i < n; ++i) {
	pix = (Guchar)i;
	colorMap->getRGB(&pix, &rgb);
	imgData.lookup[3*i] = colToByte(rgb.r);
	imgData.lookup[3*i+1] = colToByte(rgb.g);
	imgData.lookup[3*i+2] = colToByte(rgb.b);
      }
      break;
#if SPLASH_CMYK
    case splashModeCMYK8:
      imgData.lookup = (SplashColorPtr)gmalloc(4 * n);
      for (i = 0; i < n; ++i) {
	pix = (Guchar)i;