xpdfcore.cc

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//========================================================================
//
// XPDFCore.cc
//
// Copyright 2002-2003 Glyph & Cog, LLC
//
//========================================================================

#include <aconf.h>

#ifdef USE_GCC_PRAGMAS
#pragma implementation
#endif

#include <X11/keysym.h>
#include <X11/cursorfont.h>
#include <string.h>
#include "gmem.h"
#include "GString.h"
#include "GList.h"
#include "Error.h"
#include "GlobalParams.h"
#include "PDFDoc.h"
#include "Link.h"
#include "ErrorCodes.h"
#include "GfxState.h"
#include "CoreOutputDev.h"
#include "PSOutputDev.h"
#include "TextOutputDev.h"
#include "SplashBitmap.h"
#include "SplashPattern.h"
#include "XPDFApp.h"
#include "XPDFCore.h"

// these macro defns conflict with xpdf's Object class
#ifdef LESSTIF_VERSION
#undef XtDisplay
#undef XtScreen
#undef XtWindow
#undef XtParent
#undef XtIsRealized
#endif

// hack around old X includes which are missing these symbols
#ifndef XK_Page_Up
#define XK_Page_Up              0xFF55
#endif
#ifndef XK_Page_Down
#define XK_Page_Down            0xFF56
#endif
#ifndef XK_KP_Home
#define XK_KP_Home              0xFF95
#endif
#ifndef XK_KP_Left
#define XK_KP_Left              0xFF96
#endif
#ifndef XK_KP_Up
#define XK_KP_Up                0xFF97
#endif
#ifndef XK_KP_Right
#define XK_KP_Right             0xFF98
#endif
#ifndef XK_KP_Down
#define XK_KP_Down              0xFF99
#endif
#ifndef XK_KP_Prior
#define XK_KP_Prior             0xFF9A
#endif
#ifndef XK_KP_Page_Up
#define XK_KP_Page_Up           0xFF9A
#endif
#ifndef XK_KP_Next
#define XK_KP_Next              0xFF9B
#endif
#ifndef XK_KP_Page_Down
#define XK_KP_Page_Down         0xFF9B
#endif
#ifndef XK_KP_End
#define XK_KP_End               0xFF9C
#endif
#ifndef XK_KP_Begin
#define XK_KP_Begin             0xFF9D
#endif
#ifndef XK_KP_Insert
#define XK_KP_Insert            0xFF9E
#endif
#ifndef XK_KP_Delete
#define XK_KP_Delete            0xFF9F
#endif

//------------------------------------------------------------------------

GString *XPDFCore::currentSelection = NULL;
XPDFCore *XPDFCore::currentSelectionOwner = NULL;
Atom XPDFCore::targetsAtom;

//------------------------------------------------------------------------
// XPDFCoreTile
//------------------------------------------------------------------------

class XPDFCoreTile: public PDFCoreTile {
public:
  XPDFCoreTile(int xDestA, int yDestA);
  virtual ~XPDFCoreTile();
  XImage *image;
};

XPDFCoreTile::XPDFCoreTile(int xDestA, int yDestA):
  PDFCoreTile(xDestA, yDestA)
{
  image = NULL;
}

XPDFCoreTile::~XPDFCoreTile() {
  if (image) {
    gfree(image->data);
    image->data = NULL;
    XDestroyImage(image);
  }
}

//------------------------------------------------------------------------
// XPDFCore
//------------------------------------------------------------------------

XPDFCore::XPDFCore(Widget shellA, Widget parentWidgetA,
		   SplashColorPtr paperColorA, Gulong paperPixelA,
		   Gulong mattePixelA, GBool fullScreenA, GBool reverseVideoA,
		   GBool installCmap, int rgbCubeSizeA):
  PDFCore(splashModeRGB8, 4, reverseVideoA, paperColorA)
{
  GString *initialZoom;

  shell = shellA;
  parentWidget = parentWidgetA;
  display = XtDisplay(parentWidget);
  screenNum = XScreenNumberOfScreen(XtScreen(parentWidget));
  targetsAtom = XInternAtom(display, "TARGETS", False);

  paperPixel = paperPixelA;
  mattePixel = mattePixelA;
  fullScreen = fullScreenA;

  setupX(installCmap, rgbCubeSizeA);

  scrolledWin = NULL;
  hScrollBar = NULL;
  vScrollBar = NULL;
  drawAreaFrame = NULL;
  drawArea = NULL;

  // get the initial zoom value
  initialZoom = globalParams->getInitialZoom();
  if (!initialZoom->cmp("page")) {
    zoom = zoomPage;
  } else if (!initialZoom->cmp("width")) {
    zoom = zoomWidth;
  } else {
    zoom = atoi(initialZoom->getCString());
    if (zoom <= 0) {
      zoom = defZoom;
    }
  }
  delete initialZoom;

  linkAction = NULL;

  panning = gFalse;

  updateCbk = NULL;
  actionCbk = NULL;
  keyPressCbk = NULL;
  mouseCbk = NULL;

  // optional features default to on
  hyperlinksEnabled = gTrue;
  selectEnabled = gTrue;

  // do X-specific initialization and create the widgets
  initWindow();
  initPasswordDialog();
}

XPDFCore::~XPDFCore() {
  if (currentSelectionOwner == this && currentSelection) {
    delete currentSelection;
    currentSelection = NULL;
    currentSelectionOwner = NULL;
  }
  if (drawAreaGC) {
    XFreeGC(display, drawAreaGC);
  }
  if (scrolledWin) {
    XtDestroyWidget(scrolledWin);
  }
  if (busyCursor) {
    XFreeCursor(display, busyCursor);
  }
  if (linkCursor) {
    XFreeCursor(display, linkCursor);
  }
  if (selectCursor) {
    XFreeCursor(display, selectCursor);
  }
}

//------------------------------------------------------------------------
// loadFile / displayPage / displayDest
//------------------------------------------------------------------------

int XPDFCore::loadFile(GString *fileName, GString *ownerPassword,
		       GString *userPassword) {
  int err;

  err = PDFCore::loadFile(fileName, ownerPassword, userPassword);
  if (err == errNone) {
    // save the modification time
    modTime = getModTime(doc->getFileName()->getCString());

    // update the parent window
    if (updateCbk) {
      (*updateCbk)(updateCbkData, doc->getFileName(), -1,
		   doc->getNumPages(), NULL);
    }
  }
  return err;
}

int XPDFCore::loadFile(BaseStream *stream, GString *ownerPassword,
		       GString *userPassword) {
  int err;

  err = PDFCore::loadFile(stream, ownerPassword, userPassword);
  if (err == errNone) {
    // no file
    modTime = 0;

    // update the parent window
    if (updateCbk) {
      (*updateCbk)(updateCbkData, doc->getFileName(), -1,
		   doc->getNumPages(), NULL);
    }
  }
  return err;
}

void XPDFCore::resizeToPage(int pg) {
  Dimension width, height;
  double width1, height1;
  Dimension topW, topH, topBorder, daW, daH;
  Dimension displayW, displayH;

  displayW = DisplayWidth(display, screenNum);
  displayH = DisplayHeight(display, screenNum);
  if (fullScreen) {
    width = displayW;
    height = displayH;
  } else {
    if (pg < 0 || pg > doc->getNumPages()) {
      width1 = 612;
      height1 = 792;
    } else if (doc->getPageRotate(pg) == 90 ||
	       doc->getPageRotate(pg) == 270) {
      width1 = doc->getPageCropHeight(pg);
      height1 = doc->getPageCropWidth(pg);
    } else {
      width1 = doc->getPageCropWidth(pg);
      height1 = doc->getPageCropHeight(pg);
    }
    if (zoom == zoomPage || zoom == zoomWidth) {
      width = (Dimension)(width1 * 0.01 * defZoom + 0.5);
      height = (Dimension)(height1 * 0.01 * defZoom + 0.5);
    } else {
      width = (Dimension)(width1 * 0.01 * zoom + 0.5);
      height = (Dimension)(height1 * 0.01 * zoom + 0.5);
    }
    if (continuousMode) {
      height += continuousModePageSpacing;
    }
    if (width > displayW - 100) {
      width = displayW - 100;
    }
    if (height > displayH - 100) {
      height = displayH - 100;
    }
  }

  if (XtIsRealized(shell)) {
    XtVaGetValues(shell, XmNwidth, &topW, XmNheight, &topH,
		  XmNborderWidth, &topBorder, NULL);
    XtVaGetValues(drawArea, XmNwidth, &daW, XmNheight, &daH, NULL);
    XtVaSetValues(shell, XmNwidth, width + (topW - daW),
		  XmNheight, height + (topH - daH), NULL);
  } else {
    XtVaSetValues(drawArea, XmNwidth, width, XmNheight, height, NULL);
  }
}

void XPDFCore::update(int topPageA, int scrollXA, int scrollYA,
		      double zoomA, int rotateA,
		      GBool force, GBool addToHist) {
  int oldPage;

  oldPage = topPage;
  PDFCore::update(topPageA, scrollXA, scrollYA, zoomA, rotateA,
		  force, addToHist);
  linkAction = NULL;
  if (doc && topPage != oldPage) {
    if (updateCbk) {
      (*updateCbk)(updateCbkData, NULL, topPage, -1, "");
    }
  }
}

GBool XPDFCore::checkForNewFile() {
  time_t newModTime;

  if (doc->getFileName()) {
    newModTime = getModTime(doc->getFileName()->getCString());
    if (newModTime != modTime) {
      modTime = newModTime;
      return gTrue;
    }
  }
  return gFalse;
}

//------------------------------------------------------------------------
// page/position changes
//------------------------------------------------------------------------

GBool XPDFCore::gotoNextPage(int inc, GBool top) {
  if (!PDFCore::gotoNextPage(inc, top)) {
    XBell(display, 0);
    return gFalse;
  }
  return gTrue;
}

GBool XPDFCore::gotoPrevPage(int dec, GBool top, GBool bottom) {
  if (!PDFCore::gotoPrevPage(dec, top, !fullScreen && bottom)) {
    XBell(display, 0);
    return gFalse;
  }
  return gTrue;
}

GBool XPDFCore::goForward() {
  if (!PDFCore::goForward()) {
    XBell(display, 0);
    return gFalse;
  }
  return gTrue;
}

GBool XPDFCore::goBackward() {
  if (!PDFCore::goBackward()) {
    XBell(display, 0);
    return gFalse;
  }
  return gTrue;
}

//------------------------------------------------------------------------
// selection
//------------------------------------------------------------------------

// X's copy-and-paste mechanism is brain damaged.  Xt doesn't help
// any, but doesn't make it too much worse, either.  Motif, on the
// other hand, adds significant complexity to the mess.  So here we
// blow off the Motif junk and stick to plain old Xt.  The next two
// functions (copySelection and convertSelectionCbk) implement the
// magic needed to deal with Xt's mechanism.  Note that this requires
// global variables (currentSelection and currentSelectionOwner).

void XPDFCore::copySelection() {
  int pg;
  double ulx, uly, lrx, lry;

  if (!doc->okToCopy()) {
    return;
  }
  if (getSelection(&pg, &ulx, &uly, &lrx, &lry)) {
    //~ for multithreading: need a mutex here
    if (currentSelection) {
      delete currentSelection;
    }
    currentSelection = extractText(pg, ulx, uly, lrx, lry);
    currentSelectionOwner = this;
    XtOwnSelection(drawArea, XA_PRIMARY, XtLastTimestampProcessed(display),
		   &convertSelectionCbk, NULL, NULL);
  }
}

Boolean XPDFCore::convertSelectionCbk(Widget widget, Atom *selection,
				      Atom *target, Atom *type,
				      XtPointer *value, unsigned long *length,
				      int *format) {
  Atom *array;

  // send back a list of supported conversion targets
  if (*target == targetsAtom) {
    if (!(array = (Atom *)XtMalloc(sizeof(Atom)))) {
      return False;
    }
    array[0] = XA_STRING;
    *value = (XtPointer)array;
    *type = XA_ATOM;
    *format = 32;
    *length = 1;
    return True;

  // send the selected text
  } else if (*target == XA_STRING) {
    //~ for multithreading: need a mutex here
    *value = XtNewString(currentSelection->getCString());
    *length = currentSelection->getLength();
    *type = XA_STRING;
    *format = 8; // 8-bit elements
    return True;
  }

  return False;
}

//------------------------------------------------------------------------
// hyperlinks
//------------------------------------------------------------------------

GBool XPDFCore::doLink(int pg, int x, int y) {
  LinkAction *action;
  double xu, yu;