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

    }
  } else {
    // do Floyd-Steinberg dithering on the whole bitmap
    errDownR = (int *)gmallocn(width + 2, sizeof(int));
    errDownG = (int *)gmallocn(width + 2, sizeof(int));
    errDownB = (int *)gmallocn(width + 2, sizeof(int));
    errRightR = errRightG = errRightB = 0;
    errDownRightR = errDownRightG = errDownRightB = 0;
    memset(errDownR, 0, (width + 2) * sizeof(int));
    memset(errDownG, 0, (width + 2) * sizeof(int));
    memset(errDownB, 0, (width + 2) * sizeof(int));
    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);
	}
	r0 = r + errRightR + errDownR[x+1];
	g0 = g + errRightG + errDownG[x+1];
	b0 = b + errRightB + errDownB[x+1];
	if (r0 < 0) {
	  r = 0;
	} else if (r0 >= 255) {
	  r = rgbCubeSize - 1;
	} else {
	  r = div255(r0 * (rgbCubeSize - 1));
	}
	if (g0 < 0) {
	  g = 0;
	} else if (g0 >= 255) {
	  g = rgbCubeSize - 1;
	} else {
	  g = div255(g0 * (rgbCubeSize - 1));
	}
	if (b0 < 0) {
	  b = 0;
	} else if (b0 >= 255) {
	  b = rgbCubeSize - 1;
	} else {
	  b = div255(b0 * (rgbCubeSize - 1));
	}
	re = r0 - ((r << 8) - r) / (rgbCubeSize - 1);
	ge = g0 - ((g << 8) - g) / (rgbCubeSize - 1);
	be = b0 - ((b << 8) - b) / (rgbCubeSize - 1);
	errRightR = (re * 7) >> 4;
	errRightG = (ge * 7) >> 4;
	errRightB = (be * 7) >> 4;
	errDownR[x] += (re * 3) >> 4;
	errDownG[x] += (ge * 3) >> 4;
	errDownB[x] += (be * 3) >> 4;
	errDownR[x+1] = ((re * 5) >> 4) + errDownRightR;
	errDownG[x+1] = ((ge * 5) >> 4) + errDownRightG;
	errDownB[x+1] = ((be * 5) >> 4) + errDownRightB;
	errDownRightR = re >> 4;
	errDownRightG = ge >> 4;
	errDownRightB = be >> 4;
	pixel = colors[(r * rgbCubeSize + g) * rgbCubeSize + b];
	XPutPixel(image, xSrc + x, ySrc + y, pixel);
	p += 3;
      }
    }
    gfree(errDownR);
    gfree(errDownG);
    gfree(errDownB);
  }
}

void XPDFCore::redrawRect(PDFCoreTile *tileA, int xSrc, int ySrc,
			  int xDest, int yDest, int width, int height,
			  GBool composited) {
  XPDFCoreTile *tile = (XPDFCoreTile *)tileA;
  Window drawAreaWin;
  XGCValues gcValues;

  // create a GC for the drawing area
  drawAreaWin = XtWindow(drawArea);
  if (!drawAreaGC) {
    gcValues.foreground = mattePixel;
    drawAreaGC = XCreateGC(display, drawAreaWin, GCForeground, &gcValues);
  }

  // draw the document
  if (tile) {
    XPutImage(display, drawAreaWin, drawAreaGC, tile->image,
	      xSrc, ySrc, xDest, yDest, width, height);

  // draw the background
  } else {
    XFillRectangle(display, drawAreaWin, drawAreaGC,
		   xDest, yDest, width, height);
  }
}

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

  if (pages->getLength() > 0) {
    if (continuousMode) {
      maxPos = maxPageW;
    } else {
      maxPos = ((PDFCorePage *)pages->get(0))->w;
    }
  } else {
    maxPos = 1;
  }
  if (maxPos < drawAreaWidth) {
    maxPos = drawAreaWidth;
  }
  n = 0;
  XtSetArg(args[n], XmNvalue, scrollX); ++n;
  XtSetArg(args[n], XmNmaximum, maxPos); ++n;
  XtSetArg(args[n], XmNsliderSize, drawAreaWidth); ++n;
  XtSetArg(args[n], XmNincrement, 16); ++n;
  XtSetArg(args[n], XmNpageIncrement, drawAreaWidth); ++n;
  XtSetValues(hScrollBar, args, n);

  if (pages->getLength() > 0) {
    if (continuousMode) {
      maxPos = totalDocH;
    } else {
      maxPos = ((PDFCorePage *)pages->get(0))->h;
    }
  } else {
    maxPos = 1;
  }
  if (maxPos < drawAreaHeight) {
    maxPos = drawAreaHeight;
  }
  n = 0;
  XtSetArg(args[n], XmNvalue, scrollY); ++n;
  XtSetArg(args[n], XmNmaximum, maxPos); ++n;
  XtSetArg(args[n], XmNsliderSize, drawAreaHeight); ++n;
  XtSetArg(args[n], XmNincrement, 16); ++n;
  XtSetArg(args[n], XmNpageIncrement, drawAreaHeight); ++n;
  XtSetValues(vScrollBar, args, n);
}

void XPDFCore::setCursor(Cursor cursor) {
  Window topWin;

  if (cursor == currentCursor) {
    return;
  }
  if (!(topWin = XtWindow(shell))) {
    return;
  }
  if (cursor == None) {
    XUndefineCursor(display, topWin);
  } else {
    XDefineCursor(display, topWin, cursor);
  }
  XFlush(display);
  currentCursor = cursor;
}

GBool XPDFCore::doQuestionDialog(char *title, GString *msg) {
  return doDialog(XmDIALOG_QUESTION, gTrue, title, msg);
}

void XPDFCore::doInfoDialog(char *title, GString *msg) {
  doDialog(XmDIALOG_INFORMATION, gFalse, title, msg);
}

void XPDFCore::doErrorDialog(char *title, GString *msg) {
  doDialog(XmDIALOG_ERROR, gFalse, title, msg);
}

GBool XPDFCore::doDialog(int type, GBool hasCancel,
			 char *title, GString *msg) {
  Widget dialog, scroll, text;
  XtAppContext appContext;
  Arg args[20];
  int n;
  XmString s1, s2;
  XEvent event;

  n = 0;
  XtSetArg(args[n], XmNdialogType, type); ++n;
  XtSetArg(args[n], XmNdialogStyle, XmDIALOG_PRIMARY_APPLICATION_MODAL); ++n;
  s1 = XmStringCreateLocalized(title);
  XtSetArg(args[n], XmNdialogTitle, s1); ++n;
  s2 = NULL; // make gcc happy
  if (msg->getLength() <= 80) {
    s2 = XmStringCreateLocalized(msg->getCString());
    XtSetArg(args[n], XmNmessageString, s2); ++n;
  }
  dialog = XmCreateMessageDialog(drawArea, "questionDialog", args, n);
  XmStringFree(s1);
  if (msg->getLength() <= 80) {
    XmStringFree(s2);
  } else {
    n = 0;
    XtSetArg(args[n], XmNscrollingPolicy, XmAUTOMATIC); ++n;
    if (drawAreaWidth > 300) {
      XtSetArg(args[n], XmNwidth, drawAreaWidth - 100); ++n;
    }
    scroll = XmCreateScrolledWindow(dialog, "scroll", args, n);
    XtManageChild(scroll);
    n = 0;
    XtSetArg(args[n], XmNeditable, False); ++n;
    XtSetArg(args[n], XmNeditMode, XmMULTI_LINE_EDIT); ++n;
    XtSetArg(args[n], XmNvalue, msg->getCString()); ++n;
    XtSetArg(args[n], XmNshadowThickness, 0); ++n;
    text = XmCreateText(scroll, "text", args, n);
    XtManageChild(text);
  }
  XtUnmanageChild(XmMessageBoxGetChild(dialog, XmDIALOG_HELP_BUTTON));
  XtAddCallback(dialog, XmNokCallback,
		&dialogOkCbk, (XtPointer)this);
  if (hasCancel) {
    XtAddCallback(dialog, XmNcancelCallback,
		  &dialogCancelCbk, (XtPointer)this);
  } else {
    XtUnmanageChild(XmMessageBoxGetChild(dialog, XmDIALOG_CANCEL_BUTTON));
  }

  XtManageChild(dialog);

  appContext = XtWidgetToApplicationContext(dialog);
  dialogDone = 0;
  do {
    XtAppNextEvent(appContext, &event);
    XtDispatchEvent(&event);
  } while (!dialogDone);

  XtUnmanageChild(dialog);
  XtDestroyWidget(dialog);

  return dialogDone > 0;
}

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

  core->dialogDone = 1;
}

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

  core->dialogDone = -1;
}

//------------------------------------------------------------------------
// password dialog
//------------------------------------------------------------------------

void XPDFCore::initPasswordDialog() {
  Widget row, label, okBtn, cancelBtn;
  Arg args[20];
  int n;
  XmString s;

  //----- dialog
  n = 0;
  s = XmStringCreateLocalized(xpdfAppName ": Password");
  XtSetArg(args[n], XmNdialogTitle, s); ++n;
  XtSetArg(args[n], XmNdialogStyle, XmDIALOG_PRIMARY_APPLICATION_MODAL); ++n;
  passwordDialog = XmCreateFormDialog(drawArea, "passwordDialog", args, n);
  XmStringFree(s);

  //----- message
  n = 0;
  XtSetArg(args[n], XmNtopAttachment, XmATTACH_FORM); ++n;
  XtSetArg(args[n], XmNtopOffset, 4); ++n;
  XtSetArg(args[n], XmNleftAttachment, XmATTACH_FORM); ++n;
  XtSetArg(args[n], XmNleftOffset, 4); ++n;
  s = XmStringCreateLocalized("This document requires a password.");
  XtSetArg(args[n], XmNlabelString, s); ++n;
  label = XmCreateLabel(passwordDialog, "msg", args, n);
  XmStringFree(s);
  XtManageChild(label);

  //----- label and password entry
  n = 0;
  XtSetArg(args[n], XmNtopAttachment, XmATTACH_WIDGET); ++n;
  XtSetArg(args[n], XmNtopWidget, label); ++n;
  XtSetArg(args[n], XmNtopOffset, 4); ++n;
  XtSetArg(args[n], XmNleftAttachment, XmATTACH_FORM); ++n;
  XtSetArg(args[n], XmNleftOffset, 4); ++n;
  XtSetArg(args[n], XmNrightAttachment, XmATTACH_FORM); ++n;
  XtSetArg(args[n], XmNleftOffset, 4); ++n;
  XtSetArg(args[n], XmNorientation, XmHORIZONTAL); ++n;
  XtSetArg(args[n], XmNpacking, XmPACK_TIGHT); ++n;
  row = XmCreateRowColumn(passwordDialog, "row", args, n);
  XtManageChild(row);
  n = 0;
  s = XmStringCreateLocalized("Password: ");
  XtSetArg(args[n], XmNlabelString, s); ++n;
  label = XmCreateLabel(row, "label", args, n);
  XmStringFree(s);
  XtManageChild(label);
  n = 0;
  XtSetArg(args[n], XmNcolumns, 16); ++n;
  passwordText = XmCreateTextField(row, "text", args, n);
  XtManageChild(passwordText);
  XtAddCallback(passwordText, XmNmodifyVerifyCallback,
		&passwordTextVerifyCbk, this);

  //----- "Ok" and "Cancel" buttons
  n = 0;
  XtSetArg(args[n], XmNtopAttachment, XmATTACH_WIDGET); ++n;
  XtSetArg(args[n], XmNtopWidget, row); ++n;
  XtSetArg(args[n], XmNleftAttachment, XmATTACH_FORM); ++n;
  XtSetArg(args[n], XmNleftOffset, 4); ++n;
  XtSetArg(args[n], XmNbottomAttachment, XmATTACH_FORM); ++n;
  XtSetArg(args[n], XmNbottomOffset, 4); ++n;
  XtSetArg(args[n], XmNnavigationType, XmEXCLUSIVE_TAB_GROUP); ++n;
  okBtn = XmCreatePushButton(passwordDialog, "Ok", args, n);
  XtManageChild(okBtn);
  XtAddCallback(okBtn, XmNactivateCallback,
		&passwordOkCbk, (XtPointer)this);
  n = 0;
  XtSetArg(args[n], XmNtopAttachment, XmATTACH_WIDGET); ++n;
  XtSetArg(args[n], XmNtopWidget, row); ++n;
  XtSetArg(args[n], XmNrightAttachment, XmATTACH_FORM); ++n;
  XtSetArg(args[n], XmNrightOffset, 4); ++n;
  XtSetArg(args[n], XmNbottomAttachment, XmATTACH_FORM); ++n;
  XtSetArg(args[n], XmNbottomOffset, 4); ++n;
  XtSetArg(args[n], XmNnavigationType, XmEXCLUSIVE_TAB_GROUP); ++n;
  cancelBtn = XmCreatePushButton(passwordDialog, "Cancel", args, n);
  XtManageChild(cancelBtn);
  XtAddCallback(cancelBtn, XmNactivateCallback,
		&passwordCancelCbk, (XtPointer)this);
  n = 0;
  XtSetArg(args[n], XmNdefaultButton, okBtn); ++n;
  XtSetArg(args[n], XmNcancelButton, cancelBtn); ++n;
#if XmVersion > 1001
  XtSetArg(args[n], XmNinitialFocus, passwordText); ++n;
#endif
  XtSetValues(passwordDialog, args, n);
}

void XPDFCore::passwordTextVerifyCbk(Widget widget, XtPointer ptr,
				     XtPointer callData) {
  XPDFCore *core = (XPDFCore *)ptr;
  XmTextVerifyCallbackStruct *data =
      (XmTextVerifyCallbackStruct *)callData;
  int i, n;

  i = (int)data->startPos;
  n = (int)data->endPos - i;
  if (i > core->password->getLength()) {
    i = core->password->getLength();
  }
  if (i + n > core->password->getLength()) {
    n = core->password->getLength() - i;
  }
  core->password->del(i, n);
  core->password->insert(i, data->text->ptr, data->text->length);

  for (i = 0; i < data->text->length; ++i) {
    data->text->ptr[i] = '*';
  }
  data->doit = True;
}

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

  core->dialogDone = 1;
}

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

  core->dialogDone = -1;
}

GString *XPDFCore::getPassword() {
  XtAppContext appContext;
  XEvent event;

  // NB: set <password> before calling XmTextFieldSetString, because
  // SetString will trigger a call to passwordTextVerifyCbk, which
  // expects <password> to be valid
  password = new GString();
  XmTextFieldSetString(passwordText, "");
  XtManageChild(passwordDialog);

  appContext = XtWidgetToApplicationContext(passwordDialog);
  dialogDone = 0;
  do {
    XtAppNextEvent(appContext, &event);
    XtDispatchEvent(&event);
  } while (!dialogDone);
  XtUnmanageChild(passwordDialog);

  if (dialogDone < 0) {
    delete password;
    return NULL;
  }
  return password;
}