xpdfcore.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

        gfree(xcolors);
      } else {
        rgbCubeSize = 1;
        colors[0] = BlackPixel(display, screenNum);
        colors[1] = WhitePixel(display, screenNum);
      }

    // allocate colors in shared colormap
    } else {
      if (rgbCubeSize > xMaxRGBCube) {
        rgbCubeSize = xMaxRGBCube;
      }
      ok = gFalse;
      for (rgbCubeSize = rgbCubeSizeA; rgbCubeSize >= 2; --rgbCubeSize) {
        ok = gTrue;
        n = 0;
        for (r = 0; r < rgbCubeSize && ok; ++r) {
          for (g = 0; g < rgbCubeSize && ok; ++g) {
            for (b = 0; b < rgbCubeSize && ok; ++b) {
              if (n == 0) {
                colors[n] = BlackPixel(display, screenNum);
                ++n;
              } else {
                xcolor.red = (r * 65535) / (rgbCubeSize - 1);
                xcolor.green = (g * 65535) / (rgbCubeSize - 1);
                xcolor.blue = (b * 65535) / (rgbCubeSize - 1);
                if (XAllocColor(display, colormap, &xcolor)) {
                  colors[n++] = xcolor.pixel;
                } else {
                  ok = gFalse;
                }
              }
            }
          }
        }
        if (ok) {
          break;
        }
        XFreeColors(display, colormap, &colors[1], n-1, 0);
      }
      if (!ok) {
        rgbCubeSize = 1;
        colors[0] = BlackPixel(display, screenNum);
        colors[1] = WhitePixel(display, screenNum);
      }
    }
  }
}

void XPDFCore::initWindow() {
  Arg args[20];
  int n;

  // create the cursors
  busyCursor = XCreateFontCursor(display, XC_watch);
  linkCursor = XCreateFontCursor(display, XC_hand2);
  selectCursor = XCreateFontCursor(display, XC_cross);
  currentCursor = 0;

  // create the scrolled window and scrollbars
  n = 0;
  XtSetArg(args[n], XmNscrollingPolicy, XmAPPLICATION_DEFINED); ++n;
  XtSetArg(args[n], XmNvisualPolicy, XmVARIABLE); ++n;
  scrolledWin = XmCreateScrolledWindow(parentWidget, "scroll", args, n);
  XtManageChild(scrolledWin);
  n = 0;
  XtSetArg(args[n], XmNorientation, XmHORIZONTAL); ++n;
  XtSetArg(args[n], XmNminimum, 0); ++n;
  XtSetArg(args[n], XmNmaximum, 1); ++n;
  XtSetArg(args[n], XmNsliderSize, 1); ++n;
  XtSetArg(args[n], XmNvalue, 0); ++n;
  XtSetArg(args[n], XmNincrement, 1); ++n;
  XtSetArg(args[n], XmNpageIncrement, 1); ++n;
  hScrollBar = XmCreateScrollBar(scrolledWin, "hScrollBar", args, n);
  if (!fullScreen) {
    XtManageChild(hScrollBar);
  }
  XtAddCallback(hScrollBar, XmNvalueChangedCallback,
		&hScrollChangeCbk, (XtPointer)this);
#ifndef DISABLE_SMOOTH_SCROLL
  XtAddCallback(hScrollBar, XmNdragCallback,
		&hScrollDragCbk, (XtPointer)this);
#endif
  n = 0;
  XtSetArg(args[n], XmNorientation, XmVERTICAL); ++n;
  XtSetArg(args[n], XmNminimum, 0); ++n;
  XtSetArg(args[n], XmNmaximum, 1); ++n;
  XtSetArg(args[n], XmNsliderSize, 1); ++n;
  XtSetArg(args[n], XmNvalue, 0); ++n;
  XtSetArg(args[n], XmNincrement, 1); ++n;
  XtSetArg(args[n], XmNpageIncrement, 1); ++n;
  vScrollBar = XmCreateScrollBar(scrolledWin, "vScrollBar", args, n);
  if (!fullScreen) {
    XtManageChild(vScrollBar);
  }
  XtAddCallback(vScrollBar, XmNvalueChangedCallback,
		&vScrollChangeCbk, (XtPointer)this);
#ifndef DISABLE_SMOOTH_SCROLL
  XtAddCallback(vScrollBar, XmNdragCallback,
		&vScrollDragCbk, (XtPointer)this);
#endif

  // create the drawing area
  n = 0;
  XtSetArg(args[n], XmNshadowType, XmSHADOW_IN); ++n;
  XtSetArg(args[n], XmNmarginWidth, 0); ++n;
  XtSetArg(args[n], XmNmarginHeight, 0); ++n;
  if (fullScreen) {
    XtSetArg(args[n], XmNshadowThickness, 0); ++n;
  }
  drawAreaFrame = XmCreateFrame(scrolledWin, "drawAreaFrame", args, n);
  XtManageChild(drawAreaFrame);
  n = 0;
  XtSetArg(args[n], XmNresizePolicy, XmRESIZE_ANY); ++n;
  XtSetArg(args[n], XmNwidth, 700); ++n;
  XtSetArg(args[n], XmNheight, 500); ++n;
  drawArea = XmCreateDrawingArea(drawAreaFrame, "drawArea", args, n);
  XtManageChild(drawArea);
  XtAddCallback(drawArea, XmNresizeCallback, &resizeCbk, (XtPointer)this);
  XtAddCallback(drawArea, XmNexposeCallback, &redrawCbk, (XtPointer)this);
  XtAddCallback(drawArea, XmNinputCallback, &inputCbk, (XtPointer)this);
  resizeCbk(drawArea, this, NULL);

  // set up mouse motion translations
  XtOverrideTranslations(drawArea, XtParseTranslationTable(
      "<Btn1Down>:DrawingAreaInput()\n"
      "<Btn1Up>:DrawingAreaInput()\n"
      "<Btn1Motion>:DrawingAreaInput()\n"
      "<Motion>:DrawingAreaInput()"));

  // can't create a GC until the window gets mapped
  drawAreaGC = NULL;
}

void XPDFCore::hScrollChangeCbk(Widget widget, XtPointer ptr,
			     XtPointer callData) {
  XPDFCore *core = (XPDFCore *)ptr;
  XmScrollBarCallbackStruct *data = (XmScrollBarCallbackStruct *)callData;

  core->scrollTo(data->value, core->scrollY);
}

void XPDFCore::hScrollDragCbk(Widget widget, XtPointer ptr,
			      XtPointer callData) {
  XPDFCore *core = (XPDFCore *)ptr;
  XmScrollBarCallbackStruct *data = (XmScrollBarCallbackStruct *)callData;

  core->scrollTo(data->value, core->scrollY);
}

void XPDFCore::vScrollChangeCbk(Widget widget, XtPointer ptr,
			     XtPointer callData) {
  XPDFCore *core = (XPDFCore *)ptr;
  XmScrollBarCallbackStruct *data = (XmScrollBarCallbackStruct *)callData;

  core->scrollTo(core->scrollX, data->value);
}

void XPDFCore::vScrollDragCbk(Widget widget, XtPointer ptr,
			      XtPointer callData) {
  XPDFCore *core = (XPDFCore *)ptr;
  XmScrollBarCallbackStruct *data = (XmScrollBarCallbackStruct *)callData;

  core->scrollTo(core->scrollX, data->value);
}

void XPDFCore::resizeCbk(Widget widget, XtPointer ptr, XtPointer callData) {
  XPDFCore *core = (XPDFCore *)ptr;
  XEvent event;
  Widget top;
  Window rootWin;
  int x1, y1;
  Guint w1, h1, bw1, depth1;
  Arg args[2];
  int n;
  Dimension w, h;
  int sx, sy;

  // find the top-most widget which has an associated window, and look
  // for a pending ConfigureNotify in the event queue -- if there is
  // one, and it specifies a different width or height, that means
  // we're still resizing, and we want to skip the current event
  for (top = core->parentWidget;
       XtParent(top) && XtWindow(XtParent(top));
       top = XtParent(top)) ;
  if (XCheckTypedWindowEvent(core->display, XtWindow(top),
			     ConfigureNotify, &event)) {
    XPutBackEvent(core->display, &event);
    XGetGeometry(core->display, event.xconfigure.window,
		 &rootWin, &x1, &y1, &w1, &h1, &bw1, &depth1);
    if ((Guint)event.xconfigure.width != w1 ||
	(Guint)event.xconfigure.height != h1) {
      return;
    }
  }

  n = 0;
  XtSetArg(args[n], XmNwidth, &w); ++n;
  XtSetArg(args[n], XmNheight, &h); ++n;
  XtGetValues(core->drawArea, args, n);
  core->drawAreaWidth = (int)w;
  core->drawAreaHeight = (int)h;
  if (core->zoom == zoomPage || core->zoom == zoomWidth) {
    sx = sy = -1;
  } else {
    sx = core->scrollX;
    sy = core->scrollY;
  }
  core->update(core->topPage, sx, sy, core->zoom, core->rotate, gTrue, gFalse);
}

void XPDFCore::redrawCbk(Widget widget, XtPointer ptr, XtPointer callData) {
  XPDFCore *core = (XPDFCore *)ptr;
  XmDrawingAreaCallbackStruct *data = (XmDrawingAreaCallbackStruct *)callData;
  int x, y, w, h;

  if (data->reason == XmCR_EXPOSE) {
    x = data->event->xexpose.x;
    y = data->event->xexpose.y;
    w = data->event->xexpose.width;
    h = data->event->xexpose.height;
  } else {
    x = 0;
    y = 0;
    w = core->drawAreaWidth;
    h = core->drawAreaHeight;
  }
  core->redrawWindow(x, y, w, h, gFalse);
}

void XPDFCore::inputCbk(Widget widget, XtPointer ptr, XtPointer callData) {
  XPDFCore *core = (XPDFCore *)ptr;
  XmDrawingAreaCallbackStruct *data = (XmDrawingAreaCallbackStruct *)callData;
  LinkAction *action;
  int pg, x, y;
  double xu, yu;
  char *s;
  KeySym key;
  GBool ok;

  switch (data->event->type) {
  case ButtonPress:
    if (*core->mouseCbk) {
      (*core->mouseCbk)(core->mouseCbkData, data->event);
    }
    break;
  case ButtonRelease:
    if (*core->mouseCbk) {
      (*core->mouseCbk)(core->mouseCbkData, data->event);
    }
    break;
  case MotionNotify:
    if (core->doc && core->doc->getNumPages() > 0) {
      ok = core->cvtWindowToDev(data->event->xmotion.x, data->event->xmotion.y,
				&pg, &x, &y);
      if (core->dragging) {
	if (ok) {
	  core->moveSelection(pg, x, y);
	}
      } else if (core->hyperlinksEnabled) {
	core->cvtDevToUser(pg, x, y, &xu, &yu);
	if (ok && (action = core->findLink(pg, xu, yu))) {
	  core->setCursor(core->linkCursor);
	  if (action != core->linkAction) {
	    core->linkAction = action;
	    if (core->updateCbk) {
	      s = "";
	      switch (action->getKind()) {
	      case actionGoTo:
		s = "[internal link]";
		break;
	      case actionGoToR:
		s = ((LinkGoToR *)action)->getFileName()->getCString();
		break;
	      case actionLaunch:
		s = ((LinkLaunch *)action)->getFileName()->getCString();
		break;
	      case actionURI:
		s = ((LinkURI *)action)->getURI()->getCString();
		break;
	      case actionNamed:
		s = ((LinkNamed *)action)->getName()->getCString();
		break;
	      case actionMovie:
		s = "[movie]";
		break;
	      case actionUnknown:
		s = "[unknown link]";
		break;
	      }
	      (*core->updateCbk)(core->updateCbkData, NULL, -1, -1, s);
	    }
	  }
	} else {
	  core->setCursor(None);
	  if (core->linkAction) {
	    core->linkAction = NULL;
	    if (core->updateCbk) {
	      (*core->updateCbk)(core->updateCbkData, NULL, -1, -1, "");
	    }
	  }
	}
      }
    }
    if (core->panning) {
      core->scrollTo(core->scrollX - (data->event->xmotion.x - core->panMX),
		     core->scrollY - (data->event->xmotion.y - core->panMY));
      core->panMX = data->event->xmotion.x;
      core->panMY = data->event->xmotion.y;
    }
    break;
  case KeyPress:
    if (core->keyPressCbk) {
      key = XLookupKeysym(&data->event->xkey,
			  (data->event->xkey.state & ShiftMask) ? 1 : 0);
      (*core->keyPressCbk)(core->keyPressCbkData,
			   key, data->event->xkey.state, data->event);
    }
    break;
  }
}

PDFCoreTile *XPDFCore::newTile(int xDestA, int yDestA) {
  return new XPDFCoreTile(xDestA, yDestA);
}

void XPDFCore::updateTileData(PDFCoreTile *tileA, int xSrc, int ySrc,
			      int width, int height, GBool composited) {
  XPDFCoreTile *tile = (XPDFCoreTile *)tileA;
  XImage *image;
  SplashColorPtr dataPtr, p;
  Gulong pixel;
  Guchar *ap;
  Guchar alpha, alpha1;
  int w, h, bw, x, y, r, g, b, gray;
  int *errDownR, *errDownG, *errDownB;
  int errRightR, errRightG, errRightB;
  int errDownRightR, errDownRightG, errDownRightB;
  int r0, g0, b0, re, ge, be;

  if (!tile->image) {
    w = tile->xMax - tile->xMin;
    h = tile->yMax - tile->yMin;
    image = XCreateImage(display, visual, depth, ZPixmap, 0, NULL, w, h, 8, 0);
    image->data = (char *)gmalloc(h * image->bytes_per_line);
    tile->image = image;
  } else {
    image = (XImage *)tile->image;
  }

  //~ optimize for known XImage formats
  bw = tile->bitmap->getRowSize();
  dataPtr = tile->bitmap->getDataPtr();

  if (trueColor) {
    for (y = 0; y < height; ++y) {
      p = dataPtr + (ySrc + y) * bw + xSrc * 3;
      if (!composited && tile->bitmap->getAlphaPtr()) {
	ap = tile->bitmap->getAlphaPtr() +
	       (ySrc + y) * tile->bitmap->getWidth() + xSrc;
      } else {
	ap = NULL;
      }
      for (x = 0; x < width; ++x) {
	r = splashRGB8R(p);
	g = splashRGB8G(p);
	b = splashRGB8B(p);
	if (ap) {
	  alpha = *ap++;
	  alpha1 = 255 - alpha;
	  r = div255(alpha1 * paperColor[0] + alpha * r);
	  g = div255(alpha1 * paperColor[1] + alpha * g);
	  b = div255(alpha1 * paperColor[2] + alpha * b);
	}
	r >>= rDiv;
	g >>= gDiv;
	b >>= bDiv;
	pixel = ((Gulong)r << rShift) +
	        ((Gulong)g << gShift) +
	        ((Gulong)b << bShift);
	XPutPixel(image, xSrc + x, ySrc + y, pixel);
	p += 3;
      }
    }
  } else if (rgbCubeSize == 1) {
    //~ this should really use splashModeMono, with non-clustered dithering
    for (y = 0; y < height; ++y) {
      p = dataPtr + (ySrc + y) * bw + xSrc * 3;
      if (!composited && tile->bitmap->getAlphaPtr()) {
	ap = tile->bitmap->getAlphaPtr() +
	       (ySrc + y) * tile->bitmap->getWidth() + xSrc;
      } else {
	ap = NULL;
      }
      for (x = 0; x < width; ++x) {
	r = splashRGB8R(p);
	g = splashRGB8G(p);
	b = splashRGB8B(p);
	if (ap) {
	  alpha = *ap++;
	  alpha1 = 255 - alpha;
	  r = div255(alpha1 * paperColor[0] + alpha * r);
	  g = div255(alpha1 * paperColor[1] + alpha * g);
	  b = div255(alpha1 * paperColor[2] + alpha * b);
	}
	gray = (int)(0.299 * r + 0.587 * g + 0.114 * b + 0.5);
	if (gray < 128) {
	  pixel = colors[0];
	} else {
	  pixel = colors[1];
	}
	XPutPixel(image, xSrc + x, ySrc + y, pixel);
	p += 3;
      }