Line data    Source code

       1             : /* Copyright (C) 2000-2012 by George Williams */
       2             : /* 2013feb15, fileread and mem error checks, plus test for short, Jose Da Silva */
       3             : /*
       4             :  * Redistribution and use in source and binary forms, with or without
       5             :  * modification, are permitted provided that the following conditions are met:
       6             : 
       7             :  * Redistributions of source code must retain the above copyright notice, this
       8             :  * list of conditions and the following disclaimer.
       9             : 
      10             :  * Redistributions in binary form must reproduce the above copyright notice,
      11             :  * this list of conditions and the following disclaimer in the documentation
      12             :  * and/or other materials provided with the distribution.
      13             : 
      14             :  * The name of the author may not be used to endorse or promote products
      15             :  * derived from this software without specific prior written permission.
      16             : 
      17             :  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
      18             :  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
      19             :  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
      20             :  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      21             :  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
      22             :  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
      23             :  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
      24             :  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
      25             :  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
      26             :  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      27             :  */
      28             : #include "gimage.h"
      29             : 
      30           0 : static int ConvertXbmByte(int pixels) {
      31           0 :     int i,val=0;
      32             : 
      33           0 :     for ( i=0; i<8; ++i )
      34           0 :         if ( pixels&(1<<i) )
      35           0 :             val |= (0x80>>i);
      36           0 :     return( val^0xff ); /* I default black the other way */
      37             : }
      38             : 
      39           0 : GImage *GImageReadXbm(char * filename) {
      40             : /* Import an *.xbm image, else return NULL if error */
      41             :     FILE *file;
      42             :     int width, height;
      43           0 :     GImage *gi=NULL;
      44             :     struct _GImage *base;
      45           0 :     int ch,i,j,l = 0;
      46             :     long pixels;
      47             :     uint8 *scanline;
      48             : 
      49           0 :     if ( (file=fopen(filename,"r"))==NULL ) {
      50           0 :         fprintf(stderr,"Can't open \"%s\"\n", filename);
      51           0 :         return( NULL );
      52             :     }
      53             : 
      54             :     /* Get width and height */
      55           0 :     if ( fscanf(file,"#define %*s %d\n",&width)!=1 || \
      56           0 :          fscanf(file,"#define %*s %d\n",&height)!=1 )
      57             :         goto errorGImageReadXbm;
      58             : 
      59             :     /* Check for, and skip past hotspot */
      60           0 :     if ( (ch=getc(file))<0 )
      61           0 :         goto errorGImageReadXbm;
      62           0 :     if ( ch=='#' ) {
      63           0 :         if ( fscanf(file,"define %*s %*d\n")<0 ||  /* x hotspot */ \
      64           0 :              fscanf(file,"#define %*s %*d\n")<0 )  /* y hotspot */
      65             :             goto errorGImageReadXbm;
      66             :     } else
      67           0 :         if ( ungetc(ch,file)<0 )
      68           0 :             goto errorGImageReadXbm;
      69             : 
      70             :     /* Data starts after finding "static unsigned " or "static " */
      71           0 :     if ( fscanf(file,"static ")<0 || (ch=getc(file))<0 )
      72             :         goto errorGImageReadXbm;
      73           0 :     if ( ch=='u' ) {
      74           0 :         if ( fscanf(file,"nsigned ")<0 || (ch=getc(file))<0 )
      75             :             goto errorGImageReadXbm;
      76             :         /* TODO: Do we want to track signed/unsigned data? */
      77             :     }
      78             : 
      79             :     /* Data may be in char,short or long formats */
      80           0 :     if ( ch=='c' ) {
      81           0 :         if ( fscanf(file,"har %*s = {")<0 )
      82           0 :             goto errorGImageReadXbm;
      83           0 :         l=8;
      84           0 :     } else if ( ch=='s' ) {
      85           0 :         if ( fscanf(file,"hort %*s = {")<0 )
      86           0 :             goto errorGImageReadXbm;
      87           0 :         l=16;
      88           0 :     } else if ( ch=='l' ) {
      89           0 :         if ( fscanf(file,"ong %*s = {")<0 )
      90           0 :             goto errorGImageReadXbm;
      91           0 :         l=32;
      92             :     }
      93             : 
      94             :     /* Create memory to hold image, exit with NULL if not enough memory */
      95           0 :     if ( (gi=GImageCreate(it_mono,width,height))==NULL )
      96           0 :         goto errorGImageReadXbmMem;
      97             : 
      98             :     /* Convert *.xbm graphic into one that FF can use */
      99           0 :     base = gi->u.image;
     100           0 :     for ( i=0; i<height; ++i ) {
     101           0 :         scanline = base->data + i*base->bytes_per_line;
     102           0 :         for ( j=0; j<base->bytes_per_line; ++j ) {
     103           0 :             if ( fscanf(file," 0x%x",(unsigned *) &pixels)!=1 )
     104           0 :                 goto errorGImageReadXbm;
     105           0 :             *scanline++ = ConvertXbmByte(pixels);
     106           0 :             if ( l>8 && j+1<base->bytes_per_line ) {
     107           0 :                 *scanline++ = ConvertXbmByte(pixels>>8);
     108           0 :                 ++j;
     109             :             }
     110           0 :             if ( l>16 && j+1<base->bytes_per_line ) {
     111           0 :                 *scanline++ = ConvertXbmByte(pixels>>16);
     112           0 :                 ++j;
     113           0 :                 if ( j+1<base->bytes_per_line ) {
     114           0 :                     *scanline++ = ConvertXbmByte(pixels>>24);
     115           0 :                     ++j;
     116             :                 }
     117             :             }
     118           0 :             fscanf(file,",");
     119             :         }
     120             :     }
     121           0 :     fclose(file);
     122           0 :     return( gi );
     123             : 
     124             : errorGImageReadXbm:
     125           0 :     fprintf(stderr,"Bad input file \"%s\"\n",filename );
     126             : errorGImageReadXbmMem:
     127           0 :     GImageDestroy(gi);
     128           0 :     fclose(file);
     129           0 :     return( NULL );
     130             : }