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

	strObj.free();
	fclose(tmpFile);
	goto err2;
      }
      strObj.streamReset();
      while ((c = strObj.streamGetChar()) != EOF) {
	fputc(c, tmpFile);
      }
      strObj.streamClose();
      strObj.free();
      fclose(tmpFile);
      fileName = tmpFileName;

    // if there is an external font file, use it
    } else if (!(fileName = gfxFont->getExtFontFile())) {

      // look for a display font mapping or a substitute font
      if (gfxFont->isCIDFont()) {
	if (((GfxCIDFont *)gfxFont)->getCollection()) {
	  dfp = globalParams->
	          getDisplayCIDFont(gfxFont->getName(),
				    ((GfxCIDFont *)gfxFont)->getCollection());
	}
      } else {
	if (gfxFont->getName()) {
	  dfp = globalParams->getDisplayFont(gfxFont->getName());
	}
	if (!dfp) {
	  // 8-bit font substitution
	  if (gfxFont->isFixedWidth()) {
	    substIdx = 8;
	  } else if (gfxFont->isSerif()) {
	    substIdx = 4;
	  } else {
	    substIdx = 0;
	  }
	  if (gfxFont->isBold()) {
	    substIdx += 2;
	  }
	  if (gfxFont->isItalic()) {
	    substIdx += 1;
	  }
	  substName = new GString(splashOutSubstFonts[substIdx].name);
	  dfp = globalParams->getDisplayFont(substName);
	  delete substName;
	  id->setSubstIdx(substIdx);
	}
      }
      if (!dfp) {
	error(-1, "Couldn't find a font for '%s'",
	      gfxFont->getName() ? gfxFont->getName()->getCString()
	                         : "(unnamed)");
	goto err2;
      }
      switch (dfp->kind) {
      case displayFontT1:
	fileName = dfp->t1.fileName;
	fontType = gfxFont->isCIDFont() ? fontCIDType0 : fontType1;
	break;
      case displayFontTT:
	fileName = dfp->tt.fileName;
	fontType = gfxFont->isCIDFont() ? fontCIDType2 : fontTrueType;
	break;
      }
    }

    // load the font file
    switch (fontType) {
    case fontType1:
      if (!(fontFile = fontEngine->loadType1Font(
			   id,
			   fileName->getCString(),
			   fileName == tmpFileName,
			   ((Gfx8BitFont *)gfxFont)->getEncoding()))) {
	error(-1, "Couldn't create a font for '%s'",
	      gfxFont->getName() ? gfxFont->getName()->getCString()
	                         : "(unnamed)");
	goto err2;
      }
      break;
    case fontType1C:
      if (!(fontFile = fontEngine->loadType1CFont(
			   id,
			   fileName->getCString(),
			   fileName == tmpFileName,
			   ((Gfx8BitFont *)gfxFont)->getEncoding()))) {
	error(-1, "Couldn't create a font for '%s'",
	      gfxFont->getName() ? gfxFont->getName()->getCString()
	                         : "(unnamed)");
	goto err2;
      }
      break;
    case fontType1COT:
      if (!(fontFile = fontEngine->loadOpenTypeT1CFont(
			   id,
			   fileName->getCString(),
			   fileName == tmpFileName,
			   ((Gfx8BitFont *)gfxFont)->getEncoding()))) {
	error(-1, "Couldn't create a font for '%s'",
	      gfxFont->getName() ? gfxFont->getName()->getCString()
	                         : "(unnamed)");
	goto err2;
      }
      break;
    case fontTrueType:
    case fontTrueTypeOT:
      if ((ff = FoFiTrueType::load(fileName->getCString()))) {
	codeToGID = ((Gfx8BitFont *)gfxFont)->getCodeToGIDMap(ff);
	n = 256;
	delete ff;
      } else {
	codeToGID = NULL;
	n = 0;
      }
      if (!(fontFile = fontEngine->loadTrueTypeFont(
			   id,
			   fileName->getCString(),
			   fileName == tmpFileName,
			   codeToGID, n))) {
	error(-1, "Couldn't create a font for '%s'",
	      gfxFont->getName() ? gfxFont->getName()->getCString()
	                         : "(unnamed)");
	goto err2;
      }
      break;
    case fontCIDType0:
    case fontCIDType0C:
      if (!(fontFile = fontEngine->loadCIDFont(
			   id,
			   fileName->getCString(),
			   fileName == tmpFileName))) {
	error(-1, "Couldn't create a font for '%s'",
	      gfxFont->getName() ? gfxFont->getName()->getCString()
	                         : "(unnamed)");
	goto err2;
      }
      break;
    case fontCIDType0COT:
      if (!(fontFile = fontEngine->loadOpenTypeCFFFont(
			   id,
			   fileName->getCString(),
			   fileName == tmpFileName))) {
	error(-1, "Couldn't create a font for '%s'",
	      gfxFont->getName() ? gfxFont->getName()->getCString()
	                         : "(unnamed)");
	goto err2;
      }
      break;
    case fontCIDType2:
    case fontCIDType2OT:
      codeToGID = NULL;
      n = 0;
      if (dfp) {
	// create a CID-to-GID mapping, via Unicode
	if ((ctu = ((GfxCIDFont *)gfxFont)->getToUnicode())) {
	  if ((ff = FoFiTrueType::load(fileName->getCString()))) {
	    // look for a Unicode cmap
	    for (cmap = 0; cmap < ff->getNumCmaps(); ++cmap) {
	      if ((ff->getCmapPlatform(cmap) == 3 &&
		   ff->getCmapEncoding(cmap) == 1) ||
		  ff->getCmapPlatform(cmap) == 0) {
		break;
	      }
	    }
	    if (cmap < ff->getNumCmaps()) {
	      // map CID -> Unicode -> GID
	      n = ctu->getLength();
	      codeToGID = (Gushort *)gmallocn(n, sizeof(Gushort));
	      for (code = 0; code < n; ++code) {
		if (ctu->mapToUnicode(code, uBuf, 8) > 0) {
		  codeToGID[code] = ff->mapCodeToGID(cmap, uBuf[0]);
		} else {
		  codeToGID[code] = 0;
		}
	      }
	    }
	    delete ff;
	  }
	  ctu->decRefCnt();
	} else {
	  error(-1, "Couldn't find a mapping to Unicode for font '%s'",
		gfxFont->getName() ? gfxFont->getName()->getCString()
		                   : "(unnamed)");
	}
      } else {
	if (((GfxCIDFont *)gfxFont)->getCIDToGID()) {
	  n = ((GfxCIDFont *)gfxFont)->getCIDToGIDLen();
	  codeToGID = (Gushort *)gmallocn(n, sizeof(Gushort));
	  memcpy(codeToGID, ((GfxCIDFont *)gfxFont)->getCIDToGID(),
		 n * sizeof(Gushort));
	}
      }
      if (!(fontFile = fontEngine->loadTrueTypeFont(
			   id,
			   fileName->getCString(),
			   fileName == tmpFileName,
			   codeToGID, n))) {
	error(-1, "Couldn't create a font for '%s'",
	      gfxFont->getName() ? gfxFont->getName()->getCString()
	                         : "(unnamed)");
	goto err2;
      }
      break;
    default:
      // this shouldn't happen
      goto err2;
    }
  }

  // get the font matrix
  textMat = state->getTextMat();
  fontSize = state->getFontSize();
  m11 = textMat[0] * fontSize * state->getHorizScaling();
  m12 = textMat[1] * fontSize * state->getHorizScaling();
  m21 = textMat[2] * fontSize;
  m22 = textMat[3] * fontSize;

  // for substituted fonts: adjust the font matrix -- compare the
  // width of 'm' in the original font and the substituted font
  substIdx = ((SplashOutFontFileID *)fontFile->getID())->getSubstIdx();
  if (substIdx >= 0) {
    for (code = 0; code < 256; ++code) {
      if ((name = ((Gfx8BitFont *)gfxFont)->getCharName(code)) &&
	  name[0] == 'm' && name[1] == '\0') {
	break;
      }
    }
    if (code < 256) {
      w1 = ((Gfx8BitFont *)gfxFont)->getWidth(code);
      w2 = splashOutSubstFonts[substIdx].mWidth;
      if (!gfxFont->isSymbolic()) {
	// if real font is substantially narrower than substituted
	// font, reduce the font size accordingly
	if (w1 > 0.01 && w1 < 0.9 * w2) {
	  w1 /= w2;
	  m11 *= w1;
	  m21 *= w1;
	}
      }
    }
  }

  // create the scaled font
  mat[0] = m11;  mat[1] = m12;
  mat[2] = m21;  mat[3] = m22;
  font = fontEngine->getFont(fontFile, mat, splash->getMatrix());

  if (tmpFileName) {
    delete tmpFileName;
  }
  return;

 err2:
  delete id;
 err1:
  if (tmpFileName) {
    unlink(tmpFileName->getCString());
    delete tmpFileName;
  }
  return;
}

void SplashOutputDev::stroke(GfxState *state) {
  SplashPath *path;

  if (state->getStrokeColorSpace()->isNonMarking()) {
    return;
  }
  path = convertPath(state, state->getPath());
  splash->stroke(path);
  delete path;
}

void SplashOutputDev::fill(GfxState *state) {
  SplashPath *path;

  if (state->getFillColorSpace()->isNonMarking()) {
    return;
  }
  path = convertPath(state, state->getPath());
  splash->fill(path, gFalse);
  delete path;
}

void SplashOutputDev::eoFill(GfxState *state) {
  SplashPath *path;

  if (state->getFillColorSpace()->isNonMarking()) {
    return;
  }
  path = convertPath(state, state->getPath());
  splash->fill(path, gTrue);
  delete path;
}

void SplashOutputDev::clip(GfxState *state) {
  SplashPath *path;

  path = convertPath(state, state->getPath());
  splash->clipToPath(path, gFalse);
  delete path;
}

void SplashOutputDev::eoClip(GfxState *state) {
  SplashPath *path;

  path = convertPath(state, state->getPath());
  splash->clipToPath(path, gTrue);
  delete path;
}

void SplashOutputDev::clipToStrokePath(GfxState *state) {
  SplashPath *path, *path2;

  path = convertPath(state, state->getPath());
  path2 = splash->makeStrokePath(path);
  delete path;
  splash->clipToPath(path2, gFalse);
  delete path2;
}

SplashPath *SplashOutputDev::convertPath(GfxState *state, GfxPath *path) {
  SplashPath *sPath;
  GfxSubpath *subpath;
  int i, j;

  sPath = new SplashPath();
  for (i = 0; i < path->getNumSubpaths(); ++i) {
    subpath = path->getSubpath(i);
    if (subpath->getNumPoints() > 0) {
      sPath->moveTo((SplashCoord)subpath->getX(0),
		    (SplashCoord)subpath->getY(0));
      j = 1;
      while (j < subpath->getNumPoints()) {
	if (subpath->getCurve(j)) {
	  sPath->curveTo((SplashCoord)subpath->getX(j),
			 (SplashCoord)subpath->getY(j),
			 (SplashCoord)subpath->getX(j+1),
			 (SplashCoord)subpath->getY(j+1),
			 (SplashCoord)subpath->getX(j+2),
			 (SplashCoord)subpath->getY(j+2));
	  j += 3;
	} else {
	  sPath->lineTo((SplashCoord)subpath->getX(j),
			(SplashCoord)subpath->getY(j));
	  ++j;
	}
      }
      if (subpath->isClosed()) {
	sPath->close();
      }
    }
  }
  return sPath;
}

void SplashOutputDev::drawChar(GfxState *state, double x, double y,
			       double dx, double dy,
			       double originX, double originY,
			       CharCode code, int nBytes,
			       Unicode *u, int uLen) {
  SplashPath *path;
  int render;

  // check for invisible text -- this is used by Acrobat Capture
  render = state->getRender();
  if (render == 3) {
    return;
  }

  if (needFontUpdate) {
    doUpdateFont(state);
  }
  if (!font) {
    return;
  }

  x -= originX;
  y -= originY;

  // fill
  if (!(render & 1)) {
    if (!state->getFillColorSpace()->isNonMarking()) {
      splash->fillChar((SplashCoord)x, (SplashCoord)y, code, font);
    }
  }

  // stroke
  if ((render & 3) == 1 || (render & 3) == 2) {
    if (!state->getStrokeColorSpace()->isNonMarking()) {
      if ((path = font->getGlyphPath(code))) {
	path->offset((SplashCoord)x, (SplashCoord)y);
	splash->stroke(path);
	delete path;
      }
    }
  }

  // clip
  if (render & 4) {
    if ((path = font->getGlyphPath(code))) {
      path->offset((SplashCoord)x, (SplashCoord)y);
      if (textClipPath) {
	textClipPath->append(path);
	delete path;
      } else {
	textClipPath = path;
      }
    }
  }
}

GBool SplashOutputDev::beginType3Char(GfxState *state, double x, double y,
				      double dx, double dy,
				      CharCode code, Unicode *u, int uLen) {
  GfxFont *gfxFont;
  Ref *fontID;
  double *ctm, *bbox;
  T3FontCache *t3Font;
  T3GlyphStack *t3gs;
  GBool validBBox;
  double x1, y1, xMin, yMin, xMax, yMax, xt, yt;
  int i, j;

  if (!(gfxFont = state->getFont())) {
    return gFalse;
  }
  fontID = gfxFont->getID();
  ctm = state->getCTM();
  state->transform(0, 0, &xt, &yt);

  // is it the first (MRU) font in the cache?
  if (!(nT3Fonts > 0 &&
	t3FontCache[0]->matches(fontID, ctm[0], ctm[1], ctm[2], ctm[3]))) {

    // is the font elsewhere in the cache?
    for (i = 1; i < nT3Fonts; ++i) {
      if (t3FontCache[i]->matches(fontID, ctm[0], ctm[1], ctm[2], ctm[3])) {
	t3Font = t3FontCache[i];
	for (j = i; j > 0; --j) {
	  t3FontCache[j] = t3FontCache[j - 1];
	}
	t3FontCache[0] = t3Font;
	break;
      }
    }
    if (i >= nT3Fonts) {

      // create new entry in the font cache
      if (nT3Fonts == splashOutT3FontCacheSize) {
	delete t3FontCache[nT3Fonts - 1];
	--nT3Fonts;
      }
      for (j = nT3Fonts; j > 0; --j) {
	t3FontCache[j] = t3FontCache[j - 1];
      }
      ++nT3Fonts;
      bbox = gfxFont->getFontBBox();
      if (bbox[0] == 0 && bbox[1] == 0 && bbox[2] == 0 && bbox[3] == 0) {
	// unspecified bounding box -- just take a guess
	xMin = xt - 5;
	xMax = xMin + 30;
	yMax = yt + 15;
	yMin = yMax - 45;
	validBBox = gFalse;
      } else {
	state->transform(bbox[0], bbox[1], &x1, &y1);
	xMin = xMax = x1;
	yMin = yMax = y1;
	state->transform(bbox[0], bbox[3], &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(bbox[2], bbox[1], &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(bbox[2], bbox[3], &x1, &y1);
	if (x1 < xMin) {
	  xMin = x1;
	} else if (x1 > xMax) {
	  xMax = x1;
	}
	if (y1 < yMin) {
	  yMin = y1;
	} else if (y1 > yMax) {
	  yMax = y1;
	}
	validBBox = gTrue;
      }
      t3FontCache[0] = new T3FontCache(fontID, ctm[0], ctm[1], ctm[2], ctm[3],
	                               (int)floor(xMin - xt),
				       (int)floor(yMin - yt),