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Dvi.c

/* $XConsortium: Dvi.c,v 1.21 94/04/17 20:43:34 keith Exp $ */
/* $XdotOrg: $ */
/*

Copyright (c) 1991  X Consortium

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of the X Consortium shall
not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization
from the X Consortium.

*/
/* $XFree86: xc/programs/xditview/Dvi.c,v 1.3 2001/08/01 00:45:03 tsi Exp $ */


/*
 * Dvi.c - Dvi display widget
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#define XtStrlen(s)     ((s) ? strlen(s) : 0)

  /* The following are defined for the reader's convenience.  Any
     Xt..Field macro in this code just refers to some field in
     one of the substructures of the WidgetRec.  */

#include <X11/IntrinsicP.h>
#include <X11/StringDefs.h>
#include <X11/Xmu/Converters.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
#include "DviP.h"

/****************************************************************
 *
 * Full class record constant
 *
 ****************************************************************/

/* Private Data */
/* Note: default_font_map was too long a token for some machines...
 *       therefor it has been split in to and assigned to resources
 *       in the ClassInitialize routine.
 */
static char default_font_map_1[] =  "\
R     -*-times-medium-r-normal--*-*-*-*-*-*-iso8859-1\n\
I     -*-times-medium-i-normal--*-*-*-*-*-*-iso8859-1\n\
B     -*-times-bold-r-normal--*-*-*-*-*-*-iso8859-1\n\
F     -*-times-bold-i-normal--*-*-*-*-*-*-iso8859-1\n\
TR    -*-times-medium-r-normal--*-*-*-*-*-*-iso8859-1\n\
TI    -*-times-medium-i-normal--*-*-*-*-*-*-iso8859-1\n\
TB    -*-times-bold-r-normal--*-*-*-*-*-*-iso8859-1\n\
TF    -*-times-bold-i-normal--*-*-*-*-*-*-iso8859-1\n\
BI    -*-times-bold-i-normal--*-*-*-*-*-*-iso8859-1\n\
C     -*-courier-medium-r-normal--*-*-*-*-*-*-iso8859-1\n\
CO    -*-courier-medium-o-normal--*-*-*-*-*-*-iso8859-1\n\
CB    -*-courier-bold-r-normal--*-*-*-*-*-*-iso8859-1\n\
CF    -*-courier-bold-o-normal--*-*-*-*-*-*-iso8859-1\n\
H     -*-helvetica-medium-r-normal--*-*-*-*-*-*-iso8859-1\n\
HO    -*-helvetica-medium-o-normal--*-*-*-*-*-*-iso8859-1\n\
HB    -*-helvetica-bold-r-normal--*-*-*-*-*-*-iso8859-1\n\
HF    -*-helvetica-bold-o-normal--*-*-*-*-*-*-iso8859-1\n\
";
static char default_font_map_2[] =  "\
N     -*-new century schoolbook-medium-r-normal--*-*-*-*-*-*-iso8859-1\n\
NI    -*-new century schoolbook-medium-i-normal--*-*-*-*-*-*-iso8859-1\n\
NB    -*-new century schoolbook-bold-r-normal--*-*-*-*-*-*-iso8859-1\n\
NF    -*-new century schoolbook-bold-i-normal--*-*-*-*-*-*-iso8859-1\n\
A     -*-charter-medium-r-normal--*-*-*-*-*-*-iso8859-1\n\
AI    -*-charter-medium-i-normal--*-*-*-*-*-*-iso8859-1\n\
AB    -*-charter-bold-r-normal--*-*-*-*-*-*-iso8859-1\n\
AF    -*-charter-bold-i-normal--*-*-*-*-*-*-iso8859-1\n\
S     -*-symbol-medium-r-normal--*-*-*-*-*-*-adobe-fontspecific\n\
S2    -*-symbol-medium-r-normal--*-*-*-*-*-*-adobe-fontspecific\n\
";

#define offset(field) XtOffsetOf(DviRec, field)

static XtResource resources[] = { 
      {XtNfontMap, XtCFontMap, XtRString, sizeof (char *),
       offset(dvi.font_map_string), XtRString, NULL /* set in code */},
      {XtNforeground, XtCForeground, XtRPixel, sizeof (unsigned long),
       offset(dvi.foreground), XtRString, XtDefaultForeground},
      {XtNpageNumber, XtCPageNumber, XtRInt, sizeof (int),
       offset(dvi.requested_page), XtRImmediate, (XtPointer) 1},
      {XtNlastPageNumber, XtCLastPageNumber, XtRInt, sizeof (int),
       offset (dvi.last_page), XtRImmediate, (XtPointer) 0},
      {XtNfile, XtCFile, XtRFile, sizeof (FILE *),
       offset (dvi.file), XtRFile, (char *) 0},
      {XtNseek, XtCSeek, XtRBoolean, sizeof (Boolean),
       offset(dvi.seek), XtRImmediate, (XtPointer) False},
      {XtNfont, XtCFont, XtRFontStruct, sizeof (XFontStruct *),
       offset(dvi.default_font), XtRString, XtDefaultFont},
      {XtNbackingStore, XtCBackingStore, XtRBackingStore, sizeof (int),
       offset(dvi.backing_store), XtRString, "default"},
      {XtNnoPolyText, XtCNoPolyText, XtRBoolean, sizeof (Boolean),
       offset(dvi.noPolyText), XtRImmediate, (XtPointer) False},
      {XtNscreenResolution, XtCScreenResolution, XtRInt, sizeof (int),
       offset(dvi.screen_resolution), XtRImmediate, (XtPointer) 75},
      {XtNpageWidth, XtCPageWidth, XtRFloat, sizeof (float),
       offset(dvi.page_width), XtRString, "8.5"},
      {XtNpageHeight, XtCPageHeight, XtRFloat, sizeof (float),
       offset(dvi.page_height), XtRString, "11"},
      {XtNsizeScale, XtCSizeScale, XtRInt, sizeof (int),
       offset(dvi.size_scale_set), XtRImmediate, (XtPointer) 0},
};

#undef offset

static void       ClassInitialize(void);
static void       Initialize(Widget, Widget, ArgList, Cardinal *);
static void       Realize(Widget, XtValueMask *, XSetWindowAttributes *);
static void       Destroy(Widget);
static void       Redisplay(Widget, XEvent *, Region);
static Boolean          SetValues(Widget, Widget, Widget, ArgList , Cardinal *);
static Boolean          SetValuesHook(Widget, ArgList, Cardinal   *);
static XtGeometryResult QueryGeometry(Widget,
                              XtWidgetGeometry *, XtWidgetGeometry *);
static void       RequestDesiredSize(DviWidget);
static void       ShowDvi(DviWidget);
static void       CloseFile(DviWidget);
static void       OpenFile(DviWidget);

#define SuperClass ((SimpleWidgetClass)&simpleClassRec)

DviClassRec dviClassRec = {
{
      (WidgetClass) SuperClass,     /* superclass             */  
      "Dvi",                        /* class_name             */
      sizeof(DviRec),               /* size                   */
      ClassInitialize,        /* class_initialize       */
      NULL,                   /* class_part_initialize  */
      FALSE,                        /* class_inited           */
      Initialize,             /* initialize             */
      NULL,                   /* initialize_hook        */
      Realize,                /* realize          */
      NULL,                   /* actions          */
      0,                      /* num_actions            */
      resources,              /* resources              */
      XtNumber(resources),          /* resource_count   */
      NULLQUARK,              /* xrm_class              */
      FALSE,                        /* compress_motion        */
      XtExposeCompressMaximal,      /* compress_exposure      */
      TRUE,                   /* compress_enterleave    */
      FALSE,                        /* visible_interest       */
      Destroy,                /* destroy          */
      NULL,                   /* resize           */
      Redisplay,              /* expose           */
      SetValues,              /* set_values             */
      SetValuesHook,                /* set_values_hook        */
      XtInheritSetValuesAlmost,     /* set_values_almost      */
      NULL,                   /* get_values_hook        */
      NULL,                   /* accept_focus           */
      XtVersion,              /* version          */
      NULL,                   /* callback_private       */
      0,                      /* tm_table         */
      QueryGeometry,                /* query_geometry   */
      XtInheritDisplayAccelerator,  /* display_accelerator    */
      NULL,                   /* extension              */
},  /* CoreClass fields initialization */
{
    XtInheritChangeSensitive        /* change_sensitive     */
},  /* SimpleClass fields initialization */
{
    0,                                     /* field not used    */
},  /* DviClass fields initialization */
};

WidgetClass dviWidgetClass = (WidgetClass) &dviClassRec;

static void
ClassInitialize (void)
{
  int len1 = strlen(default_font_map_1);
  int len2 = strlen(default_font_map_2);
  char *dfm = XtMalloc(len1 + len2 + 1);
  char *ptr = dfm;
  strcpy(ptr, default_font_map_1); ptr += len1;
  strcpy(ptr, default_font_map_2); 
  resources[0].default_addr = dfm;

  XtAddConverter( XtRString, XtRBackingStore, XmuCvtStringToBackingStore,
             NULL, 0 );
}

/****************************************************************
 *
 * Private Procedures
 *
 ****************************************************************/

/* ARGSUSED */
static void
Initialize(request, new, args, num_args)
      Widget request, new;
      ArgList args;
      Cardinal *num_args;
{
    DviWidget     dw = (DviWidget) new;

    dw->dvi.tmpFile = 0;
    dw->dvi.readingTmp = 0;
    dw->dvi.ungot = 0;
    dw->dvi.normal_GC = 0;
    dw->dvi.file_map = 0;
    dw->dvi.fonts = 0;
    dw->dvi.font_map = 0;
    dw->dvi.current_page = 0;
    dw->dvi.font_size = 0;
    dw->dvi.font_number = 0;
    dw->dvi.device_resolution = 0;
    dw->dvi.line_width = 0;
    dw->dvi.line_style = 0;
    dw->dvi.font = 0;
    dw->dvi.display_enable = 0;
    dw->dvi.scale = 0.0;
    dw->dvi.state = 0;
    dw->dvi.cache.index = 0;
    dw->dvi.cache.font = 0; 
    dw->dvi.size_scale = 0;
    dw->dvi.size_scale_set = 0;
    RequestDesiredSize (dw);
}

static void
Realize(w, valueMask, attrs)
      Widget                  w;
      XtValueMask       *valueMask;
      XSetWindowAttributes    *attrs;
{
    DviWidget     dw = (DviWidget) w;
    XGCValues     values;

    if (dw->dvi.backing_store != Always + WhenMapped + NotUseful) {
      attrs->backing_store = dw->dvi.backing_store;
      *valueMask |= CWBackingStore;
    }
    XtCreateWindow (w, (unsigned)InputOutput, (Visual *) CopyFromParent,
                *valueMask, attrs);
    values.foreground = dw->dvi.foreground;
    dw->dvi.normal_GC = XCreateGC (XtDisplay (w), XtWindow (w),
                            GCForeground, &values);
#ifdef USE_XFT
    {
      int         scr;
      Visual            *visual;
      Colormap    cmap;
      XRenderColor      black;

      scr = XScreenNumberOfScreen (dw->core.screen);
      visual = DefaultVisual (XtDisplay (w), scr);
      cmap = DefaultColormap (XtDisplay (w), scr);
      dw->dvi.draw = XftDrawCreate (XtDisplay (w), XtWindow (w), 
                              visual, cmap);

      black.red = black.green = black.blue = 0;
      black.alpha = 0xffff;
      XftColorAllocValue (XtDisplay (w), visual, cmap,
                      &black, &dw->dvi.black);
      dw->dvi.default_font = XftFontOpenName (XtDisplay (w),
                                    scr,
                                    "serif-12");
    }
#endif
    if (dw->dvi.file)
      OpenFile (dw);
    ParseFontMap (dw);
}

static void
Destroy(w)
      Widget w;
{
      DviWidget   dw = (DviWidget) w;

      XFreeGC (XtDisplay (w), dw->dvi.normal_GC);
      DestroyFontMap (dw->dvi.font_map);
      DestroyFileMap (dw->dvi.file_map);
}

/*
 * Repaint the widget window
 */

/* ARGSUSED */
static void
Redisplay(w, event, region)
      Widget w;
      XEvent *event;
      Region region;
{
      DviWidget   dw = (DviWidget) w;
#ifndef USE_XFT
      XRectangle  extents;
#endif
      
#ifdef USE_XFT
      XClearArea (XtDisplay (dw),
                XtWindow (dw),
                0, 0, 0, 0, False);
      dw->dvi.extents.x1 = 0;
      dw->dvi.extents.y1 = 0;
      dw->dvi.extents.x2 = dw->core.width;
      dw->dvi.extents.y2 = dw->core.height;
#else
      XClipBox (region, &extents);
      dw->dvi.extents.x1 = extents.x;
      dw->dvi.extents.y1 = extents.y;
      dw->dvi.extents.x2 = extents.x + extents.width;
      dw->dvi.extents.y2 = extents.y + extents.height;
#endif
      ShowDvi (dw);
}

static void
RequestDesiredSize (dw)
    DviWidget     dw;
{
    XtWidgetGeometry    req, rep;

    dw->dvi.desired_width = dw->dvi.page_width *
                         dw->dvi.screen_resolution;
    dw->dvi.desired_height = dw->dvi.page_height *
                          dw->dvi.screen_resolution;
    req.request_mode = CWWidth|CWHeight;
    req.width = dw->dvi.desired_width;
    req.height = dw->dvi.desired_height;
    XtMakeGeometryRequest ((Widget) dw, &req, &rep);
}

/*
 * Set specified arguments into widget
 */
/* ARGSUSED */
static Boolean
SetValues (wcurrent, wrequest, wnew, args, num_args)
      Widget wcurrent, wrequest, wnew;
      ArgList args;
      Cardinal *num_args;
{
    DviWidget     current = (DviWidget) wcurrent;
    DviWidget     request = (DviWidget) wrequest;
    DviWidget     new     = (DviWidget) wnew;
    Boolean redisplay = FALSE;
    char    *new_map;
    int           cur, req;

    req = request->dvi.requested_page;
    cur = current->dvi.requested_page;
    if (cur != req) {
          if (req < 1)
            req = 1;
          if (request->dvi.file)
          {
            if (current->dvi.last_page != 0 &&
                req > current->dvi.last_page)
                  req = current->dvi.last_page;
          }
          if (cur != req)
            redisplay = TRUE;
          new->dvi.requested_page = req;
    }
    
    if (current->dvi.font_map_string != request->dvi.font_map_string) {
          new_map = XtMalloc (strlen (request->dvi.font_map_string) + 1);
          if (new_map) {
                redisplay = TRUE;
                strcpy (new_map, request->dvi.font_map_string);
                new->dvi.font_map_string = new_map;
                if (current->dvi.font_map_string)
                      XtFree (current->dvi.font_map_string);
                current->dvi.font_map_string = 0;
                ParseFontMap (new);
          }
    }
    if (current->dvi.screen_resolution != request->dvi.screen_resolution)
    {
      ResetFonts (new);
      new->dvi.line_width = -1;
    }
    if (request->dvi.device_resolution)
      new->dvi.scale = ((double) request->dvi.screen_resolution) /
                       ((double) request->dvi.device_resolution);
    if (current->dvi.page_width !=  request->dvi.page_width ||
      current->dvi.page_height != request->dvi.page_height ||
      current->dvi.screen_resolution != request->dvi.screen_resolution)
    {
      RequestDesiredSize (new);
      redisplay = TRUE;
    }
    return redisplay;
}

/*
 * use the set_values_hook entry to check when
 * the file is set
 */

static Boolean
SetValuesHook (widget, args, num_argsp)
      Widget            widget;
      ArgList           args;
      Cardinal    *num_argsp;
{
      DviWidget   dw = (DviWidget) widget;
      Cardinal    i;

      for (i = 0; i < *num_argsp; i++) {
            if (!strcmp (args[i].name, XtNfile)) {
                  CloseFile (dw);
                  OpenFile (dw);
                  return TRUE;
            }
      }
      return FALSE;
}

static void
CloseFile (dw)
      DviWidget   dw;
{
    if (dw->dvi.tmpFile)
      fclose (dw->dvi.tmpFile);
    ForgetPagePositions (dw);
}

static void
OpenFile (dw)
      DviWidget   dw;
{
    char    tmpName[sizeof ("/tmp/dviXXXXXX")];
#ifdef HAS_MKSTEMP
    int fd;
#endif

    dw->dvi.tmpFile = 0;
    if (!dw->dvi.seek) {
      strcpy (tmpName, "/tmp/dviXXXXXX");
#ifndef HAS_MKSTEMP
      mktemp (tmpName);
      dw->dvi.tmpFile = fopen (tmpName, "w+");
#else
      fd = mkstemp(tmpName);
      dw->dvi.tmpFile = fdopen(fd, "w+");
#endif
      unlink (tmpName);
    }
    if (dw->dvi.requested_page < 1)
      dw->dvi.requested_page = 1;
    dw->dvi.last_page = 0;
}

static XtGeometryResult
QueryGeometry (w, request, geometry_return)
      Widget                  w;
      XtWidgetGeometry  *request, *geometry_return;
{
      XtGeometryResult  ret;
      DviWidget         dw = (DviWidget) w;

      ret = XtGeometryYes;
      if ((int)request->width < dw->dvi.desired_width
          || (int)request->height < dw->dvi.desired_height)
            ret = XtGeometryAlmost;
      geometry_return->width = dw->dvi.desired_width;
      geometry_return->height = dw->dvi.desired_height;
      geometry_return->request_mode = CWWidth|CWHeight;
      return ret;
}

void
SetDeviceResolution (dw, resolution)
      DviWidget   dw;
      int       resolution;
{
    if (resolution != dw->dvi.device_resolution) {
      dw->dvi.device_resolution = resolution;
      dw->dvi.scale = ((double)  dw->dvi.screen_resolution) /
                  ((double) resolution);
    }
}

static void
ShowDvi (dw)
      DviWidget   dw;
{
      int   i;
      long  file_position;

      if (!dw->dvi.file) 
        return;

      if (dw->dvi.requested_page < 1)
            dw->dvi.requested_page = 1;

      if (dw->dvi.last_page != 0 && dw->dvi.requested_page > dw->dvi.last_page)
            dw->dvi.requested_page = dw->dvi.last_page;

      file_position = SearchPagePosition (dw, dw->dvi.requested_page);
      if (file_position != -1) {
            FileSeek(dw, file_position);
            dw->dvi.current_page = dw->dvi.requested_page;
      } else {
            for (i=dw->dvi.requested_page; i > 0; i--) {
                  file_position = SearchPagePosition (dw, i);
                  if (file_position != -1)
                        break;
            }
            if (file_position == -1)
                  file_position = 0;
            FileSeek (dw, file_position);

            dw->dvi.current_page = i;
            
            dw->dvi.display_enable = 0;
            while (dw->dvi.current_page != dw->dvi.requested_page) {
                  dw->dvi.current_page = ParseInput (dw);
                  /*
                   * at EOF, seek back to the begining of this page.
                   */
                  if (feof (dw->dvi.file)) {
                        file_position = SearchPagePosition (dw,
                                    dw->dvi.current_page);
                        if (file_position != -1)
                              FileSeek (dw, file_position);
                        break;
                  }
            }
      }
      
      dw->dvi.display_enable = 1;
      ParseInput (dw);
      if (dw->dvi.last_page && dw->dvi.requested_page > dw->dvi.last_page)
            dw->dvi.requested_page = dw->dvi.last_page;
}

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