xref: /xsrc/external/mit/xditview/dist/Dvi.c

/*

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.

*/


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

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

  /* 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...
 *       therefore it has been split in two and assigned to resources
 *       in the ClassInitialize routine.
 */
static const 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 const 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       */
     NULL,                      /* 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)
{
    size_t len1 = strlen(default_font_map_1);
    size_t len2 = strlen(default_font_map_2);
    char *dfm = XtMalloc(len1 + len2 + 1);
    char *ptr = dfm;

    memcpy(ptr, default_font_map_1, len1);
    ptr += len1;
    memcpy(ptr, default_font_map_2, len2);
    ptr[len2] = '\0';
    resources[0].default_addr = dfm;

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

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

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

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

static void
Realize(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 = XScreenNumberOfScreen(dw->core.screen);
        Visual *visual = DefaultVisual(XtDisplay(w), scr);
        Colormap cmap = DefaultColormap(XtDisplay(w), scr);
        dw->dvi.draw = XftDrawCreate(XtDisplay(w), XtWindow(w), visual, cmap);

        XRenderColor black = {
            .red = 0,
            .green = 0,
            .blue = 0,
            .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(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(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(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(Widget wcurrent, Widget wrequest, Widget wnew,
          ArgList args, Cardinal *num_args)
{
    DviWidget current = (DviWidget) wcurrent;
    DviWidget request = (DviWidget) wrequest;
    DviWidget new = (DviWidget) wnew;
    Boolean redisplay = FALSE;

    int req = request->dvi.requested_page;
    int 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) {
        size_t  map_len = strlen (request->dvi.font_map_string) + 1;
        char *  new_map = XtMalloc (map_len);

        if (new_map) {
            redisplay = TRUE;
            memcpy(new_map, request->dvi.font_map_string, map_len);
            new->dvi.font_map_string = new_map;
            if (current->dvi.font_map_string)
                XtFree(current->dvi.font_map_string);
            current->dvi.font_map_string = NULL;
            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 widget, ArgList args, Cardinal *num_argsp)
{
    DviWidget dw = (DviWidget) widget;

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

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

static void
OpenFile(DviWidget dw)
{
    dw->dvi.tmpFile = NULL;
    if (!dw->dvi.seek) {
        char tmpName[] = "/tmp/dviXXXXXX";

#ifndef HAS_MKSTEMP
        mktemp(tmpName);
        dw->dvi.tmpFile = fopen(tmpName, "w+");
#else
        int fd = mkstemp(tmpName);

        if (fd != -1) {
            dw->dvi.tmpFile = fdopen(fd, "w+");
            if (dw->dvi.tmpFile == NULL)
                close(fd);
        }
#endif
        remove(tmpName);
    }
    if (dw->dvi.requested_page < 1)
        dw->dvi.requested_page = 1;
    dw->dvi.last_page = 0;
}

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

    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(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(DviWidget dw)
{
    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 {
        int i;

        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 beginning 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;
}