-
Notifications
You must be signed in to change notification settings - Fork 4
/
tif_next.cs
executable file
·137 lines (123 loc) · 4.08 KB
/
tif_next.cs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
#if NEXT_SUPPORT
// tif_next.cs
//
// Based on LIBTIFF, Version 3.9.4 - 15-Jun-2010
// Copyright (c) 2006-2010 by the Authors
// Copyright (c) 1988-1997 Sam Leffler
// Copyright (c) 1991-1997 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
using System;
using System.Collections.Generic;
using System.Text;
namespace Free.Ports.LibTiff
{
public static partial class libtiff
{
const int NeXT_LITERALROW=0x00;
const int NeXT_LITERALSPAN=0x40;
static bool NeXTDecode(TIFF tif, byte[] buf, int occ, ushort s)
{
// Each scanline is assumed to start off as all
// white (we assume a PhotometricInterpretation
// of "min-is-black").
int cc_=occ;
for(uint op=0; (cc_--)>0; op++) buf[op]=0xff;
uint bp=tif.tif_rawcp;
uint cc=tif.tif_rawcc;
uint scanline=tif.tif_scanlinesize;
for(uint row=0; occ>0; occ-=(int)scanline, row+=scanline)
{
int n=tif.tif_rawdata[bp++];
cc--;
switch(n)
{
case NeXT_LITERALROW:
// The entire scanline is given as literal values.
if(cc<scanline) goto bad;
Array.Copy(tif.tif_rawdata, bp, buf, row, scanline);
bp+=scanline;
cc-=scanline;
break;
case NeXT_LITERALSPAN:
{
// The scanline has a literal span
// that begins at some offset.
int off=(tif.tif_rawdata[bp]*256)+tif.tif_rawdata[bp+1];
n=(tif.tif_rawdata[bp+2]*256)+tif.tif_rawdata[bp+3];
if(cc<4+n||off+n>scanline) goto bad;
Array.Copy(tif.tif_rawdata, bp+4, buf, row+off, n);
bp+=(uint)(4+n);
cc-=(uint)(4+n);
break;
}
default:
{
int npixels=0, grey;
uint 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.
uint op=row;
for(; ; )
{
grey=(n>>6)&0x3;
n&=0x3f;
while((n--)>0&&npixels<imagewidth)
{
switch(npixels++&3)
{
case 0: buf[op]=(byte)(grey<<6); break;
case 1: buf[op]|=(byte)(grey<<4); break;
case 2: buf[op]|=(byte)(grey<<2); break;
case 3: buf[op++]|=(byte)grey; break;
}
}
if(npixels>=imagewidth) break;
if(cc==0) goto bad;
n=tif.tif_rawdata[bp++];
cc--;
}
break;
}
}
}
tif.tif_rawcp=bp;
tif.tif_rawcc=cc;
return true;
bad:
TIFFErrorExt(tif.tif_clientdata, tif.tif_name, "NeXTDecode: Not enough data for scanline {0}", tif.tif_row);
return false;
}
static bool TIFFInitNeXT(TIFF tif, COMPRESSION scheme)
{
tif.tif_decoderow=NeXTDecode;
tif.tif_decodestrip=NeXTDecode;
tif.tif_decodetile=NeXTDecode;
return true;
}
}
}
#endif // NEXT_SUPPORT