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root/radiance/ray/src/common/bmpfile.c
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Comparing ray/src/common/bmpfile.c (file contents):
Revision 2.17 by schorsch, Thu Mar 10 23:18:59 2016 UTC vs.
Revision 2.20 by greg, Wed Jan 23 19:13:55 2019 UTC

# Line 17 | Line 17 | static const char RCSid[] = "$Id$";
17   #define putc    putc_unlocked
18   #endif
19  
20 < /* get corresponding error message */
20 > /* Get corresponding error message */
21   const char *
22   BMPerrorMessage(int ec)
23   {
# Line 38 | Line 38 | BMPerrorMessage(int ec)
38          return "Unknown BMP error";
39   }
40  
41 < /* check than header is sensible */
41 > /* Check that header is sensible */
42   static int
43   BMPheaderOK(const BMPHeader *hdr)
44   {
# Line 89 | Line 89 | BMPheaderOK(const BMPHeader *hdr)
89                                          /* get next byte from reader */
90   #define rdbyte(c,br)    ((br)->fpos += (c=(*(br)->cget)((br)->c_data))!=EOF, c)
91  
92 < /* read n bytes */
92 > /* Read n bytes */
93   static int
94   rdbytes(char *bp, uint32 n, BMPReader *br)
95   {
# Line 103 | Line 103 | rdbytes(char *bp, uint32 n, BMPReader *br)
103          return BIR_OK;
104   }
105  
106 < /* read 32-bit integer in littlendian order */
106 > /* Read 32-bit integer in littlendian order */
107   static int32
108   rdint32(BMPReader *br)
109   {
# Line 117 | Line 117 | rdint32(BMPReader *br)
117          return i;                       /* -1 on EOF */
118   }
119  
120 < /* read 16-bit unsigned integer in littlendian order */
120 > /* Read 16-bit unsigned integer in littlendian order */
121   static int
122   rduint16(BMPReader *br)
123   {
# Line 129 | Line 129 | rduint16(BMPReader *br)
129          return i;                       /* -1 on EOF */
130   }
131  
132 < /* seek on reader or return 0 (BIR_OK) on success */
132 > /* Seek on reader or return 0 (BIR_OK) on success */
133   static int
134   rdseek(uint32 pos, BMPReader *br)
135   {
# Line 141 | Line 141 | rdseek(uint32 pos, BMPReader *br)
141          return BIR_OK;
142   }
143  
144 < /* open BMP stream for reading and get first scanline */
144 > /* Open BMP stream for reading and get first scanline */
145   BMPReader *
146   BMPopenReader(int (*cget)(void *), int (*seek)(uint32, void *), void *c_data)
147   {
# Line 248 | Line 248 | err:
248          return NULL;
249   }
250  
251 < /* determine if image is grayscale */
251 > /* Determine if image is grayscale */
252   int
253   BMPisGrayscale(const BMPHeader *hdr)
254   {
# Line 265 | Line 265 | BMPisGrayscale(const BMPHeader *hdr)
265          return 1;                       /* all colors neutral in map */
266   }
267  
268 < /* read and decode next BMP scanline */
268 > /* Read and decode next BMP scanline */
269   int
270   BMPreadScanline(BMPReader *br)
271   {
# Line 364 | Line 364 | BMPreadScanline(BMPReader *br)
364          return BIR_OK;
365   }
366  
367 < /* read a specific scanline */
367 > /* Read a specific scanline */
368   int
369   BMPseekScanline(int y, BMPReader *br)
370   {
# Line 407 | Line 407 | BMPseekScanline(int y, BMPReader *br)
407          return BIR_OK;
408   }
409  
410 < /* get ith pixel from last scanline */
410 > /* Get ith pixel from last scanline */
411   RGBquad
412   BMPdecodePixel(int i, const BMPReader *br)
413   {
# Line 453 | Line 453 | BMPdecodePixel(int i, const BMPReader *br)
453          case 8:
454                  return br->hdr->palette[br->scanline[i]];
455          case 1:
456 <                return br->hdr->palette[br->scanline[i>>3]>>((7-i)&7) & 1];
456 >                return br->hdr->palette[br->scanline[i>>3]>>(7-(i&7)) & 1];
457          case 4:
458                  return br->hdr->palette[br->scanline[i>>1]>>(i&1?4:0) & 0xf];
459          case 16:
# Line 471 | Line 471 | BMPdecodePixel(int i, const BMPReader *br)
471          return black;                           /* should never happen */
472   }
473  
474 < /* free BMP reader resources */
474 > /* Free BMP reader resources */
475   void
476   BMPfreeReader(BMPReader *br)
477   {
# Line 508 | Line 508 | stdio_fseek(uint32 pos, void *p)
508          return fseek((FILE *)p, (long)pos, 0);
509   }
510  
511 < /* allocate uncompressed (24-bit) RGB header */
511 > /* Allocate uncompressed (24-bit) RGB header */
512   BMPHeader *
513   BMPtruecolorHeader(int xr, int yr, int infolen)
514   {
# Line 531 | Line 531 | BMPtruecolorHeader(int xr, int yr, int infolen)
531          return hdr;
532   }
533  
534 < /* allocate color-mapped header (defaults to minimal grayscale) */
534 > /* Allocate color-mapped header (defaults to minimal grayscale) */
535   BMPHeader *
536   BMPmappedHeader(int xr, int yr, int infolen, int ncolors)
537   {
# Line 576 | Line 576 | BMPmappedHeader(int xr, int yr, int infolen, int ncolo
576                                          ((bw)->flen = (bw)->fpos) : \
577                                          (bw)->fpos )
578  
579 < /* write out a string of bytes */
579 > /* Write out a string of bytes */
580   static void
581   wrbytes(char *bp, uint32 n, BMPWriter *bw)
582   {
# Line 584 | Line 584 | wrbytes(char *bp, uint32 n, BMPWriter *bw)
584                  wrbyte(*bp++, bw);
585   }
586  
587 < /* write 32-bit integer in littlendian order */
587 > /* Write 32-bit integer in littlendian order */
588   static void
589   wrint32(int32 i, BMPWriter *bw)
590   {
# Line 594 | Line 594 | wrint32(int32 i, BMPWriter *bw)
594          wrbyte(i>>24 & 0xff, bw);
595   }
596  
597 < /* write 16-bit unsigned integer in littlendian order */
597 > /* Write 16-bit unsigned integer in littlendian order */
598   static void
599   wruint16(uint16 ui, BMPWriter *bw)
600   {
# Line 602 | Line 602 | wruint16(uint16 ui, BMPWriter *bw)
602          wrbyte(ui>>8 & 0xff, bw);
603   }
604  
605 < /* seek to the specified file position, returning 0 (BIR_OK) on success */
605 > /* Seek to the specified file position, returning 0 (BIR_OK) on success */
606   static int
607   wrseek(uint32 pos, BMPWriter *bw)
608   {
# Line 618 | Line 618 | wrseek(uint32 pos, BMPWriter *bw)
618          return BIR_OK;
619   }
620  
621 < /* open BMP stream for writing */
621 > /* Open BMP stream for writing */
622   BMPWriter *
623   BMPopenWriter(void (*cput)(int, void *), int (*seek)(uint32, void *),
624                          void *c_data, BMPHeader *hdr)
# Line 691 | Line 691 | BMPopenWriter(void (*cput)(int, void *), int (*seek)(u
691          return bw;
692   }
693  
694 < /* find position of next run of 5 or more identical bytes, or 255 if none */
694 > /* Find position of next run of 5 or more identical bytes, or 255 if none */
695   static int
696   findNextRun(const int8 *bp, int len)
697   {
# Line 708 | Line 708 | findNextRun(const int8 *bp, int len)
708          return pos;                             /* didn't find any */
709   }
710                                  
711 < /* write the current scanline */
711 > /* Write the current scanline */
712   int
713   BMPwriteScanline(BMPWriter *bw)
714   {
# Line 753 | Line 753 | BMPwriteScanline(BMPWriter *bw)
753                  }
754                  if (n <= 0)                     /* was that it? */
755                          break;
756 <                val = *sp;                      /* output run */
757 <                for (cnt = 1; --n && cnt < 255; cnt++)
758 <                        if (*++sp != val)
756 >                val = *sp++;                    /* output run */
757 >                for (cnt = 1; --n && cnt < 255; cnt++, sp++)
758 >                        if (*sp != val)
759                                  break;
760                  wrbyte(cnt, bw);
761                  wrbyte(val, bw);
# Line 775 | Line 775 | BMPwriteScanline(BMPWriter *bw)
775          return BIR_OK;
776   }
777  
778 < /* free BMP writer resources */
778 > /* Free BMP writer resources */
779   void
780   BMPfreeWriter(BMPWriter *bw)
781   {

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