| #ifndef lint |
| static char rcsid[] = "$Header: /cvs/bao-parsec/ext/splash2x/apps/volrend/src/libtiff/tif_next.c,v 1.1.1.1 2012/03/29 17:22:43 uid42307 Exp $"; |
| #endif |
| |
| /* |
| * Copyright (c) 1988, 1989, 1990, 1991, 1992 Sam Leffler |
| * Copyright (c) 1991, 1992 Silicon Graphics, Inc. |
| * |
| * Permission to use, copy, modify, distribute, and sell this software and |
| * its documentation for any purpose is hereby granted without fee, provided |
| * that (i) the above copyright notices and this permission notice appear in |
| * all copies of the software and related documentation, and (ii) the names of |
| * Sam Leffler and Silicon Graphics may not be used in any advertising or |
| * publicity relating to the software without the specific, prior written |
| * permission of Sam Leffler and Silicon Graphics. |
| * |
| * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY |
| * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. |
| * |
| * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR |
| * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, |
| * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, |
| * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF |
| * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
| * OF THIS SOFTWARE. |
| */ |
| |
| /* |
| * TIFF Library. |
| * |
| * NeXT 2-bit Grey Scale Compression Algorithm Support |
| */ |
| #include "tiffioP.h" |
| |
| #if USE_PROTOTYPES |
| static int NeXTDecode(TIFF *, u_char *, int, u_int); |
| #else |
| static int NeXTDecode(); |
| #endif |
| |
| TIFFInitNeXT(tif) |
| TIFF *tif; |
| { |
| tif->tif_decoderow = NeXTDecode; |
| tif->tif_decodestrip = NeXTDecode; |
| tif->tif_decodetile = NeXTDecode; |
| return (1); |
| } |
| |
| #define SETPIXEL(op, v) { \ |
| switch (npixels++ & 3) { \ |
| case 0: op[0] = (v) << 6; break; \ |
| case 1: op[0] |= (v) << 4; break; \ |
| case 2: op[0] |= (v) << 2; break; \ |
| case 3: *op++ |= (v); break; \ |
| } \ |
| } |
| |
| #define LITERALROW 0x00 |
| #define LITERALSPAN 0x40 |
| #define WHITE ((1<<2)-1) |
| |
| static int |
| NeXTDecode(tif, buf, occ, s) |
| TIFF *tif; |
| u_char *buf; |
| int occ; |
| u_int s; |
| { |
| register u_char *bp, *op; |
| register int cc, n; |
| u_char *row; |
| int scanline; |
| |
| /* |
| * Each scanline is assumed to start off as all |
| * white (we assume a PhotometricInterpretation |
| * of ``min-is-black''). |
| */ |
| for (op = buf, cc = occ; cc-- > 0;) |
| *op++ = 0xff; |
| |
| bp = (u_char *)tif->tif_rawcp; |
| cc = tif->tif_rawcc; |
| scanline = tif->tif_scanlinesize; |
| for (row = buf; occ > 0; occ -= scanline, row += scanline) { |
| n = *bp++, cc--; |
| switch (n) { |
| case LITERALROW: |
| /* |
| * The entire scanline is given as literal values. |
| */ |
| if (cc < scanline) |
| goto bad; |
| bcopy(bp, row, scanline); |
| bp += scanline; |
| cc -= scanline; |
| break; |
| case LITERALSPAN: { |
| int off; |
| /* |
| * The scanline has a literal span |
| * that begins at some offset. |
| */ |
| off = (bp[0] * 256) + bp[1]; |
| n = (bp[2] * 256) + bp[3]; |
| if (cc < 4+n) |
| goto bad; |
| bcopy(bp+4, row+off, n); |
| bp += 4+n; |
| cc -= 4+n; |
| break; |
| } |
| default: { |
| register int npixels = 0, grey; |
| int imagewidth = tif->tif_dir.td_imagewidth; |
| |
| /* |
| * The scanline is composed of a sequence |
| * of constant color ``runs''. We shift |
| * into ``run mode'' and interpret bytes |
| * as codes of the form <color><npixels> |
| * until we've filled the scanline. |
| */ |
| op = row; |
| for (;;) { |
| grey = (n>>6) & 0x3; |
| n &= 0x3f; |
| while (n-- > 0) |
| SETPIXEL(op, grey); |
| if (npixels >= imagewidth) |
| break; |
| if (cc == 0) |
| goto bad; |
| n = *bp++, cc--; |
| } |
| break; |
| } |
| } |
| } |
| tif->tif_rawcp = (char *)bp; |
| tif->tif_rawcc = cc; |
| return (1); |
| bad: |
| TIFFError(tif->tif_name, "NeXTDecode: Not enough data for scanline %d", |
| tif->tif_row); |
| return (0); |
| } |