diff options
Diffstat (limited to 'nx-X11/lib/lbxutil/image/epackbits.c')
| -rw-r--r-- | nx-X11/lib/lbxutil/image/epackbits.c | 202 |
1 files changed, 0 insertions, 202 deletions
diff --git a/nx-X11/lib/lbxutil/image/epackbits.c b/nx-X11/lib/lbxutil/image/epackbits.c deleted file mode 100644 index 816fee57a..000000000 --- a/nx-X11/lib/lbxutil/image/epackbits.c +++ /dev/null @@ -1,202 +0,0 @@ -/* $Xorg: epackbits.c,v 1.4 2000/08/17 19:46:41 cpqbld Exp $ */ -/* - * 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. - */ - -#include <X11/Xfuncproto.h> -#include <X11/extensions/lbximage.h> - -/* - * ------------------------------------------------------------------------- - * PackBits encoding for 8 bit color images - * ------------------------------------------------------------------------- - */ - -#define PutByte(byte,bufptr,bytesLeft) \ -{ \ - if (*bytesLeft < 1) {\ - *outbuf = outptr; \ - return (0); \ - } \ - *bufptr++ = byte; \ - (*bytesLeft)--; \ -} - - -static int -EncodePackBits (char *inbuf, - int numPixels, - char **outbuf, - int *bytesLeft) - -{ - register int pixelsLeft = numPixels; - register char *outptr = *outbuf; - register char *lastliteral; - register int n, b; - enum { BASE, LITERAL, RUN, LITERAL_RUN } state; - - state = BASE; - lastliteral = 0; - - while (pixelsLeft > 0) - { - /* - * Find the longest string of identical bytes. - */ - - b = *inbuf++, pixelsLeft--, n = 1; - for (; pixelsLeft > 0 && b == *inbuf; pixelsLeft--, inbuf++) - n++; - - again: - - switch (state) - { - case BASE: /* initial state, set run/literal */ - if (n > 1) - { - state = RUN; - - if (n > 128) - { - PutByte (-127, outptr, bytesLeft); - PutByte (b, outptr, bytesLeft); - n -= 128; - goto again; - } - - PutByte (-(n-1), outptr, bytesLeft); - PutByte (b, outptr, bytesLeft); - } - else - { - lastliteral = outptr; - PutByte (0, outptr, bytesLeft); - PutByte (b, outptr, bytesLeft); - state = LITERAL; - } - - break; - - case LITERAL: /* last object was literal string */ - if (n > 1) - { - state = LITERAL_RUN; - - if (n > 128) - { - PutByte (-127, outptr, bytesLeft); - PutByte (b, outptr, bytesLeft); - n -= 128; - goto again; - } - - PutByte (-(n-1), outptr, bytesLeft); /* encode run */ - PutByte (b, outptr, bytesLeft); - } - else - { /* extend literal */ - if (++(*lastliteral) == 127) - state = BASE; - PutByte (b, outptr, bytesLeft); - } - - break; - - case RUN: /* last object was run */ - if (n > 1) - { - if (n > 128) - { - PutByte (-127, outptr, bytesLeft); - PutByte (b, outptr, bytesLeft); - n -= 128; - goto again; - } - PutByte (-(n-1), outptr, bytesLeft); - PutByte (b, outptr, bytesLeft); - } - else - { - lastliteral = outptr; - PutByte (0, outptr, bytesLeft); - PutByte (b, outptr, bytesLeft); - state = LITERAL; - } - - break; - - case LITERAL_RUN: /* literal followed by a run */ - /* - * Check to see if previous run should - * be converted to a literal, in which - * case we convert literal-run-literal - * to a single literal. - */ - - if (n == 1 && outptr[-2] == (char)-1 && *lastliteral < 126) - { - state = (((*lastliteral) += 2) == 127 ? BASE : LITERAL); - outptr[-2] = outptr[-1]; /* replicate */ - } - else - state = RUN; - goto again; - } - } - - *outbuf = outptr; - - return (1); -} - - -int -LbxImageEncodePackBits (char *inbuf, - char *outbuf, - int outbufSize, - int format, - int depth, - int num_scan_lines, - int scan_line_size, - int *bytesCompressed) - -{ - char *outbuf_start = outbuf; - int padded_scan_line_size = (scan_line_size % 4) ? - scan_line_size + (4 - scan_line_size % 4) : scan_line_size; - int bytesLeft = outbufSize; - - while (num_scan_lines > 0) - { - if (!EncodePackBits (inbuf, scan_line_size, &outbuf, &bytesLeft)) - return (LBX_IMAGE_COMPRESS_NOT_WORTH_IT); - - inbuf += padded_scan_line_size; - num_scan_lines--; - } - - *bytesCompressed = outbuf - outbuf_start; - return (LBX_IMAGE_COMPRESS_SUCCESS); -} |