sp-epsf.c

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/*
 * Copyright (C) 2000, Matias Atria
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

/* postscript specials */

#include <config.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>

#include "mdvi.h"
#include "private.h"

typedef struct {
    double  ox;
    double  oy;
    double  bw;
    double  bh;
    double  angle;
} EpsfBox;

#define LLX 0
#define LLY 1
#define URX 2
#define URY 3
#define RWI 4
#define RHI 5
#define HOFF    6
#define VOFF    7
#define HSIZE   8
#define VSIZE   9
#define HSCALE  10
#define VSCALE  11
#define ANGLE   12
#define CLIP    13

void    epsf_special __PROTO((DviContext *dvi, char *prefix, char *arg));

/* Note: the given strings are modified in place */
static char *parse_epsf_special(EpsfBox *box, char **ret, 
    char *prefix, char *arg)
{
    static struct {
        char *name;
        int  has_arg;
        char *value;
    } keys[] = {
        {"llx", 1, "0"},
        {"lly", 1, "0"},
        {"urx", 1, "0"},
        {"ury", 1, "0"},
        {"rwi", 1, "0"},
        {"rhi", 1, "0"},
        {"hoffset", 1, "0"},
        {"voffset", 1, "0"},
        {"hsize", 1, "612"},
        {"vsize", 1, "792"},
        {"hscale", 1, "100"},
        {"vscale", 1, "100"},
        {"angle", 1, "0"},
        {"clip", 0, "0"}
    };
#define NKEYS   (sizeof(keys) / sizeof(keys[0]))
    char    *ptr;
    char    *filename;
    double  value[NKEYS];
    Uchar   present[NKEYS];
    Buffer  buffer;
    char    *name;
    int i;
    double  originx;
    double  originy;
    double  hsize;
    double  vsize;
    double  hscale;
    double  vscale;
        
    /* this special has the form
     *   ["]file.ps["] [key=valye]*
     */
    
    /* scan the filename */
    while(*arg == ' ' || *arg == '\t')
        arg++;

    /* make a copy of the string */
    ptr = arg;

    if(*ptr == '"')
        for(name = ++ptr; *ptr && *ptr != '"'; ptr++);
    else
        for(name = ptr; *ptr && *ptr != ' ' && *ptr != '\t'; ptr++);
    if(ptr == name)
        return NULL;
    *ptr++ = 0;
    filename = name;

    /* reset values to defaults */
    for(i = 0; i < NKEYS; i++) {
        value[i] = atof(keys[i].value);
        present[i] = 0;
    }
    
    buff_init(&buffer);
    buff_add(&buffer, "@beginspecial ", 0);

    while(*ptr) {
        const char *keyname;
        char    *val;
        char    *p;

        while(*ptr == ' ' || *ptr == '\t')
            ptr++;
        keyname = ptr;
        
        /* get the whole key=value pair */
        for(; *ptr && *ptr != ' ' && *ptr != '\t'; ptr++);
        
        if(*ptr) *ptr++ = 0;
        /* now we shouldn't touch `ptr' anymore */
        
        /* now work on this pair */
        p = strchr(keyname, '=');
        if(p == NULL)
            val = NULL;
        else {
            *p++ = 0;
            if(*p == '"') {
                val = ++p;
                /* skip until closing quote */
                while(*p && *p != '"')
                    p++;
                if(*p != '"')
                    mdvi_warning(
                    _("%s: malformed value for key `%s'\n"),
                        filename, keyname);
            } else
                val = p;
        }

        /* lookup the key */
        for(i = 0; i < NKEYS; i++)
            if(STRCEQ(keys[i].name, keyname))
                break;
        if(i == NKEYS) {
            mdvi_warning(_("%s: unknown key `%s' ignored\n"),
                     filename, keyname);
            continue;
        }
        if(keys[i].has_arg && val == NULL) {
            mdvi_warning(_("%s: no argument for key `%s', using defaults\n"),
                     filename, keyname);
            val = keys[i].value;
        } else if(!keys[i].has_arg && val) {
            mdvi_warning(_("%s: argument `%s' ignored for key `%s'\n"),
                     filename, val, keyname);
            val = NULL;
        }
        if(val)
            value[i] = atof(val);
        
        /* put the argument */
        buff_add(&buffer, val, 0);
        buff_add(&buffer, " @", 2);
        buff_add(&buffer, keyname, 0);
        buff_add(&buffer, " ", 1);
        
        /* remember that this option was given */
        present[i] = 0xff;
    }
    buff_add(&buffer, " @setspecial", 0);
    
    /* now compute the bounding box (code comes from dvips) */
    originx = 0;
    originy = 0;
    hscale = 1;
    vscale = 1;
    hsize = 0;
    vsize = 0;
    
    if(present[HSIZE])
        hsize = value[HSIZE];
    if(present[VSIZE])
        vsize = value[VSIZE];
    if(present[HOFF])
        originx = value[HOFF];
    if(present[VOFF])
        originy = value[VOFF];
    if(present[HSCALE])
        hscale = value[HSCALE] / 100.0;
    if(present[VSCALE])
        vscale = value[VSCALE] / 100.0;
    if(present[URX] && present[LLX])
        hsize = value[URX] - value[LLX];
    if(present[URY] && present[LLY])
        vsize = value[URY] - value[LLY];
    if(present[RWI] || present[RHI]) {
        if(present[RWI] && !present[RHI])
            hscale = vscale = value[RWI] / (10.0 * hsize);
        else if(present[RHI] && !present[RWI])
            hscale = vscale = value[RHI] / (10.0 * vsize);
        else {
            hscale = value[RWI] / (10.0 * hsize);
            vscale = value[RHI] / (10.0 * vsize);
        }
    }
    
    box->ox = originx;
    box->oy = originy;
    box->bw = hsize * hscale;
    box->bh = vsize * vscale;
    box->angle = value[ANGLE];

    *ret = buffer.data;
    
    return filename;
}

void    epsf_special(DviContext *dvi, char *prefix, char *arg)
{
    char    *file;
    char    *special;
    char    *psfile;
    char    *tmp;
    EpsfBox box = {0, 0, 0, 0};
    int x, y;
    int w, h;
    double  xf, vf;
    struct stat buf;
    
    file = parse_epsf_special(&box, &special, prefix, arg);
    if (file != NULL)
        mdvi_free (special);

    xf = dvi->params.dpi * dvi->params.mag / (72.0 * dvi->params.hshrink);
    vf = dvi->params.vdpi * dvi->params.mag / (72.0 * dvi->params.vshrink);
    w = FROUND(box.bw * xf);
    h = FROUND(box.bh * vf);
    x = FROUND(box.ox * xf) + dvi->pos.hh;
    y = FROUND(box.oy * vf) + dvi->pos.vv - h + 1;

    if (!file || !dvi->device.draw_ps) {
        dvi->device.draw_rule (dvi, x, y, w, h, 0);
        return;
    }

    if (file[0] == '/') { /* Absolute path */
        if (stat (file, &buf) == 0)
            dvi->device.draw_ps (dvi, file, x, y, w, h);
        else
            dvi->device.draw_rule (dvi, x, y, w, h, 0);
        return;
    }

    tmp = mdvi_strrstr (dvi->filename, "/");
    if (tmp) { /* Document directory */
        int path_len = strlen (dvi->filename) - strlen (tmp + 1);
        int file_len = strlen (file);
        
        psfile = mdvi_malloc (path_len + file_len + 1);
        psfile[0] = '\0';
        strncat (psfile, dvi->filename, path_len);
        strncat (psfile, file, file_len);

        if (stat (psfile, &buf) == 0) {
            dvi->device.draw_ps (dvi, psfile, x, y, w, h);
            mdvi_free (psfile);

            return;
        }

        mdvi_free (psfile);
    }
            
    psfile = mdvi_build_path_from_cwd (file);
    if (stat (psfile, &buf) == 0) { /* Current working dir */
        dvi->device.draw_ps (dvi, psfile, x, y, w, h);
        mdvi_free (psfile);

        return;
    }

    mdvi_free (psfile);
    
    psfile = kpse_find_pict (file);
    if (psfile) { /* kpse */
        dvi->device.draw_ps (dvi, psfile, x, y, w, h);
    } else {
        dvi->device.draw_rule(dvi, x, y, w, h, 0);
    }

    free (psfile);
}