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Fixing comments to match reality. No bug.
[mozilla-central.git] / jpeg / jdcolor.c
blob30720c420274f152351322014e4ed406cdcc66ed
1 /*
2 * jdcolor.c
3 *
4 * Copyright (C) 1991-1997, Thomas G. Lane.
5 * This file is part of the Independent JPEG Group's software.
6 * For conditions of distribution and use, see the accompanying README file.
7 *
8 * This file contains output colorspace conversion routines.
9 */
10
11 #define JPEG_INTERNALS
12 #include "jinclude.h"
13 #include "jpeglib.h"
14 #include "jconfig.h"
15
16
17 /* Private subobject */
18
19 typedef struct {
20 struct jpeg_color_deconverter pub; /* public fields */
21
22 /* These fields are not needed anymore as these are now static tables */
23
24 #if 0
25 /* Private state for YCC->RGB conversion */
26 int * Cr_r_tab; /* => table for Cr to R conversion */
27 int * Cb_b_tab; /* => table for Cb to B conversion */
28 INT32 * Cr_g_tab; /* => table for Cr to G conversion */
29 INT32 * Cb_g_tab; /* => table for Cb to G conversion */
30 #endif
31 } my_color_deconverter;
32
33 typedef my_color_deconverter * my_cconvert_ptr;
34
35
36 /**************** YCbCr -> RGB conversion: most common case **************/
37
38 /*
39 * YCbCr is defined per CCIR 601-1, except that Cb and Cr are
40 * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5.
41 * The conversion equations to be implemented are therefore
42 * R = Y + 1.40200 * Cr
43 * G = Y - 0.34414 * Cb - 0.71414 * Cr
44 * B = Y + 1.77200 * Cb
45 * where Cb and Cr represent the incoming values less CENTERJSAMPLE.
46 * (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.)
47 *
48 * To avoid floating-point arithmetic, we represent the fractional constants
49 * as integers scaled up by 2^16 (about 4 digits precision); we have to divide
50 * the products by 2^16, with appropriate rounding, to get the correct answer.
51 * Notice that Y, being an integral input, does not contribute any fraction
52 * so it need not participate in the rounding.
53 *
54 * For even more speed, we avoid doing any multiplications in the inner loop
55 * by precalculating the constants times Cb and Cr for all possible values.
56 * For 8-bit JSAMPLEs this is very reasonable (only 256 entries per table);
57 * for 12-bit samples it is still acceptable. It's not very reasonable for
58 * 16-bit samples, but if you want lossless storage you shouldn't be changing
59 * colorspace anyway.
60 * The Cr=>R and Cb=>B values can be rounded to integers in advance; the
61 * values for the G calculation are left scaled up, since we must add them
62 * together before rounding.
63 */
64
65 #define SCALEBITS 16 /* speediest right-shift on some machines */
66 #define ONE_HALF ((INT32) 1 << (SCALEBITS-1))
67 #define FIX(x) ((INT32) ((x) * (1L<<SCALEBITS) + 0.5))
68
69 /* Use static tables for color processing. */
70
71 const int Cr_r_tab[(MAXJSAMPLE+1) * SIZEOF(int)] ={
72 0xffffff4dUL, 0xffffff4eUL, 0xffffff4fUL, 0xffffff51UL, 0xffffff52UL, 0xffffff54UL,
73 0xffffff55UL, 0xffffff56UL, 0xffffff58UL, 0xffffff59UL, 0xffffff5bUL, 0xffffff5cUL,
74 0xffffff5dUL, 0xffffff5fUL, 0xffffff60UL, 0xffffff62UL, 0xffffff63UL, 0xffffff64UL,
75 0xffffff66UL, 0xffffff67UL, 0xffffff69UL, 0xffffff6aUL, 0xffffff6bUL, 0xffffff6dUL,
76 0xffffff6eUL, 0xffffff70UL, 0xffffff71UL, 0xffffff72UL, 0xffffff74UL, 0xffffff75UL,
77 0xffffff77UL, 0xffffff78UL, 0xffffff79UL, 0xffffff7bUL, 0xffffff7cUL, 0xffffff7eUL,
78 0xffffff7fUL, 0xffffff80UL, 0xffffff82UL, 0xffffff83UL, 0xffffff85UL, 0xffffff86UL,
79 0xffffff87UL, 0xffffff89UL, 0xffffff8aUL, 0xffffff8cUL, 0xffffff8dUL, 0xffffff8eUL,
80 0xffffff90UL, 0xffffff91UL, 0xffffff93UL, 0xffffff94UL, 0xffffff95UL, 0xffffff97UL,
81 0xffffff98UL, 0xffffff9aUL, 0xffffff9bUL, 0xffffff9cUL, 0xffffff9eUL, 0xffffff9fUL,
82 0xffffffa1UL, 0xffffffa2UL, 0xffffffa3UL, 0xffffffa5UL, 0xffffffa6UL, 0xffffffa8UL,
83 0xffffffa9UL, 0xffffffaaUL, 0xffffffacUL, 0xffffffadUL, 0xffffffafUL, 0xffffffb0UL,
84 0xffffffb1UL, 0xffffffb3UL, 0xffffffb4UL, 0xffffffb6UL, 0xffffffb7UL, 0xffffffb8UL,
85 0xffffffbaUL, 0xffffffbbUL, 0xffffffbdUL, 0xffffffbeUL, 0xffffffc0UL, 0xffffffc1UL,
86 0xffffffc2UL, 0xffffffc4UL, 0xffffffc5UL, 0xffffffc7UL, 0xffffffc8UL, 0xffffffc9UL,
87 0xffffffcbUL, 0xffffffccUL, 0xffffffceUL, 0xffffffcfUL, 0xffffffd0UL, 0xffffffd2UL,
88 0xffffffd3UL, 0xffffffd5UL, 0xffffffd6UL, 0xffffffd7UL, 0xffffffd9UL, 0xffffffdaUL,
89 0xffffffdcUL, 0xffffffddUL, 0xffffffdeUL, 0xffffffe0UL, 0xffffffe1UL, 0xffffffe3UL,
90 0xffffffe4UL, 0xffffffe5UL, 0xffffffe7UL, 0xffffffe8UL, 0xffffffeaUL, 0xffffffebUL,
91 0xffffffecUL, 0xffffffeeUL, 0xffffffefUL, 0xfffffff1UL, 0xfffffff2UL, 0xfffffff3UL,
92 0xfffffff5UL, 0xfffffff6UL, 0xfffffff8UL, 0xfffffff9UL, 0xfffffffaUL, 0xfffffffcUL,
93 0xfffffffdUL, 0xffffffffUL, 0x00UL, 0x01UL, 0x03UL, 0x04UL,
94 0x06UL, 0x07UL, 0x08UL, 0x0aUL, 0x0bUL, 0x0dUL,
95 0x0eUL, 0x0fUL, 0x11UL, 0x12UL, 0x14UL, 0x15UL,
96 0x16UL, 0x18UL, 0x19UL, 0x1bUL, 0x1cUL, 0x1dUL,
97 0x1fUL, 0x20UL, 0x22UL, 0x23UL, 0x24UL, 0x26UL,
98 0x27UL, 0x29UL, 0x2aUL, 0x2bUL, 0x2dUL, 0x2eUL,
99 0x30UL, 0x31UL, 0x32UL, 0x34UL, 0x35UL, 0x37UL,
100 0x38UL, 0x39UL, 0x3bUL, 0x3cUL, 0x3eUL, 0x3fUL,
101 0x40UL, 0x42UL, 0x43UL, 0x45UL, 0x46UL, 0x48UL,
102 0x49UL, 0x4aUL, 0x4cUL, 0x4dUL, 0x4fUL, 0x50UL,
103 0x51UL, 0x53UL, 0x54UL, 0x56UL, 0x57UL, 0x58UL,
104 0x5aUL, 0x5bUL, 0x5dUL, 0x5eUL, 0x5fUL, 0x61UL,
105 0x62UL, 0x64UL, 0x65UL, 0x66UL, 0x68UL, 0x69UL,
106 0x6bUL, 0x6cUL, 0x6dUL, 0x6fUL, 0x70UL, 0x72UL,
107 0x73UL, 0x74UL, 0x76UL, 0x77UL, 0x79UL, 0x7aUL,
108 0x7bUL, 0x7dUL, 0x7eUL, 0x80UL, 0x81UL, 0x82UL,
109 0x84UL, 0x85UL, 0x87UL, 0x88UL, 0x89UL, 0x8bUL,
110 0x8cUL, 0x8eUL, 0x8fUL, 0x90UL, 0x92UL, 0x93UL,
111 0x95UL, 0x96UL, 0x97UL, 0x99UL, 0x9aUL, 0x9cUL,
112 0x9dUL, 0x9eUL, 0xa0UL, 0xa1UL, 0xa3UL, 0xa4UL,
113 0xa5UL, 0xa7UL, 0xa8UL, 0xaaUL, 0xabUL, 0xacUL,
114 0xaeUL, 0xafUL, 0xb1UL, 0xb2UL
115 };
116
117 const int Cb_b_tab[(MAXJSAMPLE+1) * SIZEOF(int)] ={
118 0xffffff1dUL, 0xffffff1fUL, 0xffffff21UL, 0xffffff22UL, 0xffffff24UL, 0xffffff26UL,
119 0xffffff28UL, 0xffffff2aUL, 0xffffff2bUL, 0xffffff2dUL, 0xffffff2fUL, 0xffffff31UL,
120 0xffffff32UL, 0xffffff34UL, 0xffffff36UL, 0xffffff38UL, 0xffffff3aUL, 0xffffff3bUL,
121 0xffffff3dUL, 0xffffff3fUL, 0xffffff41UL, 0xffffff42UL, 0xffffff44UL, 0xffffff46UL,
122 0xffffff48UL, 0xffffff49UL, 0xffffff4bUL, 0xffffff4dUL, 0xffffff4fUL, 0xffffff51UL,
123 0xffffff52UL, 0xffffff54UL, 0xffffff56UL, 0xffffff58UL, 0xffffff59UL, 0xffffff5bUL,
124 0xffffff5dUL, 0xffffff5fUL, 0xffffff61UL, 0xffffff62UL, 0xffffff64UL, 0xffffff66UL,
125 0xffffff68UL, 0xffffff69UL, 0xffffff6bUL, 0xffffff6dUL, 0xffffff6fUL, 0xffffff70UL,
126 0xffffff72UL, 0xffffff74UL, 0xffffff76UL, 0xffffff78UL, 0xffffff79UL, 0xffffff7bUL,
127 0xffffff7dUL, 0xffffff7fUL, 0xffffff80UL, 0xffffff82UL, 0xffffff84UL, 0xffffff86UL,
128 0xffffff88UL, 0xffffff89UL, 0xffffff8bUL, 0xffffff8dUL, 0xffffff8fUL, 0xffffff90UL,
129 0xffffff92UL, 0xffffff94UL, 0xffffff96UL, 0xffffff97UL, 0xffffff99UL, 0xffffff9bUL,
130 0xffffff9dUL, 0xffffff9fUL, 0xffffffa0UL, 0xffffffa2UL, 0xffffffa4UL, 0xffffffa6UL,
131 0xffffffa7UL, 0xffffffa9UL, 0xffffffabUL, 0xffffffadUL, 0xffffffaeUL, 0xffffffb0UL,
132 0xffffffb2UL, 0xffffffb4UL, 0xffffffb6UL, 0xffffffb7UL, 0xffffffb9UL, 0xffffffbbUL,
133 0xffffffbdUL, 0xffffffbeUL, 0xffffffc0UL, 0xffffffc2UL, 0xffffffc4UL, 0xffffffc6UL,
134 0xffffffc7UL, 0xffffffc9UL, 0xffffffcbUL, 0xffffffcdUL, 0xffffffceUL, 0xffffffd0UL,
135 0xffffffd2UL, 0xffffffd4UL, 0xffffffd5UL, 0xffffffd7UL, 0xffffffd9UL, 0xffffffdbUL,
136 0xffffffddUL, 0xffffffdeUL, 0xffffffe0UL, 0xffffffe2UL, 0xffffffe4UL, 0xffffffe5UL,
137 0xffffffe7UL, 0xffffffe9UL, 0xffffffebUL, 0xffffffedUL, 0xffffffeeUL, 0xfffffff0UL,
138 0xfffffff2UL, 0xfffffff4UL, 0xfffffff5UL, 0xfffffff7UL, 0xfffffff9UL, 0xfffffffbUL,
139 0xfffffffcUL, 0xfffffffeUL, 0x00UL, 0x02UL, 0x04UL, 0x05UL,
140 0x07UL, 0x09UL, 0x0bUL, 0x0cUL, 0x0eUL, 0x10UL,
141 0x12UL, 0x13UL, 0x15UL, 0x17UL, 0x19UL, 0x1bUL,
142 0x1cUL, 0x1eUL, 0x20UL, 0x22UL, 0x23UL, 0x25UL,
143 0x27UL, 0x29UL, 0x2bUL, 0x2cUL, 0x2eUL, 0x30UL,
144 0x32UL, 0x33UL, 0x35UL, 0x37UL, 0x39UL, 0x3aUL,
145 0x3cUL, 0x3eUL, 0x40UL, 0x42UL, 0x43UL, 0x45UL,
146 0x47UL, 0x49UL, 0x4aUL, 0x4cUL, 0x4eUL, 0x50UL,
147 0x52UL, 0x53UL, 0x55UL, 0x57UL, 0x59UL, 0x5aUL,
148 0x5cUL, 0x5eUL, 0x60UL, 0x61UL, 0x63UL, 0x65UL,
149 0x67UL, 0x69UL, 0x6aUL, 0x6cUL, 0x6eUL, 0x70UL,
150 0x71UL, 0x73UL, 0x75UL, 0x77UL, 0x78UL, 0x7aUL,
151 0x7cUL, 0x7eUL, 0x80UL, 0x81UL, 0x83UL, 0x85UL,
152 0x87UL, 0x88UL, 0x8aUL, 0x8cUL, 0x8eUL, 0x90UL,
153 0x91UL, 0x93UL, 0x95UL, 0x97UL, 0x98UL, 0x9aUL,
154 0x9cUL, 0x9eUL, 0x9fUL, 0xa1UL, 0xa3UL, 0xa5UL,
155 0xa7UL, 0xa8UL, 0xaaUL, 0xacUL, 0xaeUL, 0xafUL,
156 0xb1UL, 0xb3UL, 0xb5UL, 0xb7UL, 0xb8UL, 0xbaUL,
157 0xbcUL, 0xbeUL, 0xbfUL, 0xc1UL, 0xc3UL, 0xc5UL,
158 0xc6UL, 0xc8UL, 0xcaUL, 0xccUL, 0xceUL, 0xcfUL,
159 0xd1UL, 0xd3UL, 0xd5UL, 0xd6UL, 0xd8UL, 0xdaUL,
160 0xdcUL, 0xdeUL, 0xdfUL, 0xe1UL
161 };
162
163 const int Cr_g_tab[(MAXJSAMPLE+1) * SIZEOF(int)] ={
164 0x5b6900UL, 0x5ab22eUL, 0x59fb5cUL, 0x59448aUL, 0x588db8UL, 0x57d6e6UL,
165 0x572014UL, 0x566942UL, 0x55b270UL, 0x54fb9eUL, 0x5444ccUL, 0x538dfaUL,
166 0x52d728UL, 0x522056UL, 0x516984UL, 0x50b2b2UL, 0x4ffbe0UL, 0x4f450eUL,
167 0x4e8e3cUL, 0x4dd76aUL, 0x4d2098UL, 0x4c69c6UL, 0x4bb2f4UL, 0x4afc22UL,
168 0x4a4550UL, 0x498e7eUL, 0x48d7acUL, 0x4820daUL, 0x476a08UL, 0x46b336UL,
169 0x45fc64UL, 0x454592UL, 0x448ec0UL, 0x43d7eeUL, 0x43211cUL, 0x426a4aUL,
170 0x41b378UL, 0x40fca6UL, 0x4045d4UL, 0x3f8f02UL, 0x3ed830UL, 0x3e215eUL,
171 0x3d6a8cUL, 0x3cb3baUL, 0x3bfce8UL, 0x3b4616UL, 0x3a8f44UL, 0x39d872UL,
172 0x3921a0UL, 0x386aceUL, 0x37b3fcUL, 0x36fd2aUL, 0x364658UL, 0x358f86UL,
173 0x34d8b4UL, 0x3421e2UL, 0x336b10UL, 0x32b43eUL, 0x31fd6cUL, 0x31469aUL,
174 0x308fc8UL, 0x2fd8f6UL, 0x2f2224UL, 0x2e6b52UL, 0x2db480UL, 0x2cfdaeUL,
175 0x2c46dcUL, 0x2b900aUL, 0x2ad938UL, 0x2a2266UL, 0x296b94UL, 0x28b4c2UL,
176 0x27fdf0UL, 0x27471eUL, 0x26904cUL, 0x25d97aUL, 0x2522a8UL, 0x246bd6UL,
177 0x23b504UL, 0x22fe32UL, 0x224760UL, 0x21908eUL, 0x20d9bcUL, 0x2022eaUL,
178 0x1f6c18UL, 0x1eb546UL, 0x1dfe74UL, 0x1d47a2UL, 0x1c90d0UL, 0x1bd9feUL,
179 0x1b232cUL, 0x1a6c5aUL, 0x19b588UL, 0x18feb6UL, 0x1847e4UL, 0x179112UL,
180 0x16da40UL, 0x16236eUL, 0x156c9cUL, 0x14b5caUL, 0x13fef8UL, 0x134826UL,
181 0x129154UL, 0x11da82UL, 0x1123b0UL, 0x106cdeUL, 0xfb60cUL, 0xeff3aUL,
182 0xe4868UL, 0xd9196UL, 0xcdac4UL, 0xc23f2UL, 0xb6d20UL, 0xab64eUL,
183 0x9ff7cUL, 0x948aaUL, 0x891d8UL, 0x7db06UL, 0x72434UL, 0x66d62UL,
184 0x5b690UL, 0x4ffbeUL, 0x448ecUL, 0x3921aUL, 0x2db48UL, 0x22476UL,
185 0x16da4UL, 0xb6d2UL, 0x0UL, 0xffff492eUL, 0xfffe925cUL, 0xfffddb8aUL,
186 0xfffd24b8UL, 0xfffc6de6UL, 0xfffbb714UL, 0xfffb0042UL, 0xfffa4970UL, 0xfff9929eUL,
187 0xfff8dbccUL, 0xfff824faUL, 0xfff76e28UL, 0xfff6b756UL, 0xfff60084UL, 0xfff549b2UL,
188 0xfff492e0UL, 0xfff3dc0eUL, 0xfff3253cUL, 0xfff26e6aUL, 0xfff1b798UL, 0xfff100c6UL,
189 0xfff049f4UL, 0xffef9322UL, 0xffeedc50UL, 0xffee257eUL, 0xffed6eacUL, 0xffecb7daUL,
190 0xffec0108UL, 0xffeb4a36UL, 0xffea9364UL, 0xffe9dc92UL, 0xffe925c0UL, 0xffe86eeeUL,
191 0xffe7b81cUL, 0xffe7014aUL, 0xffe64a78UL, 0xffe593a6UL, 0xffe4dcd4UL, 0xffe42602UL,
192 0xffe36f30UL, 0xffe2b85eUL, 0xffe2018cUL, 0xffe14abaUL, 0xffe093e8UL, 0xffdfdd16UL,
193 0xffdf2644UL, 0xffde6f72UL, 0xffddb8a0UL, 0xffdd01ceUL, 0xffdc4afcUL, 0xffdb942aUL,
194 0xffdadd58UL, 0xffda2686UL, 0xffd96fb4UL, 0xffd8b8e2UL, 0xffd80210UL, 0xffd74b3eUL,
195 0xffd6946cUL, 0xffd5dd9aUL, 0xffd526c8UL, 0xffd46ff6UL, 0xffd3b924UL, 0xffd30252UL,
196 0xffd24b80UL, 0xffd194aeUL, 0xffd0dddcUL, 0xffd0270aUL, 0xffcf7038UL, 0xffceb966UL,
197 0xffce0294UL, 0xffcd4bc2UL, 0xffcc94f0UL, 0xffcbde1eUL, 0xffcb274cUL, 0xffca707aUL,
198 0xffc9b9a8UL, 0xffc902d6UL, 0xffc84c04UL, 0xffc79532UL, 0xffc6de60UL, 0xffc6278eUL,
199 0xffc570bcUL, 0xffc4b9eaUL, 0xffc40318UL, 0xffc34c46UL, 0xffc29574UL, 0xffc1dea2UL,
200 0xffc127d0UL, 0xffc070feUL, 0xffbfba2cUL, 0xffbf035aUL, 0xffbe4c88UL, 0xffbd95b6UL,
201 0xffbcdee4UL, 0xffbc2812UL, 0xffbb7140UL, 0xffbaba6eUL, 0xffba039cUL, 0xffb94ccaUL,
202 0xffb895f8UL, 0xffb7df26UL, 0xffb72854UL, 0xffb67182UL, 0xffb5bab0UL, 0xffb503deUL,
203 0xffb44d0cUL, 0xffb3963aUL, 0xffb2df68UL, 0xffb22896UL, 0xffb171c4UL, 0xffb0baf2UL,
204 0xffb00420UL, 0xffaf4d4eUL, 0xffae967cUL, 0xffaddfaaUL, 0xffad28d8UL, 0xffac7206UL,
205 0xffabbb34UL, 0xffab0462UL, 0xffaa4d90UL, 0xffa996beUL, 0xffa8dfecUL, 0xffa8291aUL,
206 0xffa77248UL, 0xffa6bb76UL, 0xffa604a4UL, 0xffa54dd2UL
207 };
208
209 const int Cb_g_tab[(MAXJSAMPLE+1) * SIZEOF(int)] ={
210 0x2c8d00UL, 0x2c34e6UL, 0x2bdcccUL, 0x2b84b2UL, 0x2b2c98UL, 0x2ad47eUL,
211 0x2a7c64UL, 0x2a244aUL, 0x29cc30UL, 0x297416UL, 0x291bfcUL, 0x28c3e2UL,
212 0x286bc8UL, 0x2813aeUL, 0x27bb94UL, 0x27637aUL, 0x270b60UL, 0x26b346UL,
213 0x265b2cUL, 0x260312UL, 0x25aaf8UL, 0x2552deUL, 0x24fac4UL, 0x24a2aaUL,
214 0x244a90UL, 0x23f276UL, 0x239a5cUL, 0x234242UL, 0x22ea28UL, 0x22920eUL,
215 0x2239f4UL, 0x21e1daUL, 0x2189c0UL, 0x2131a6UL, 0x20d98cUL, 0x208172UL,
216 0x202958UL, 0x1fd13eUL, 0x1f7924UL, 0x1f210aUL, 0x1ec8f0UL, 0x1e70d6UL,
217 0x1e18bcUL, 0x1dc0a2UL, 0x1d6888UL, 0x1d106eUL, 0x1cb854UL, 0x1c603aUL,
218 0x1c0820UL, 0x1bb006UL, 0x1b57ecUL, 0x1affd2UL, 0x1aa7b8UL, 0x1a4f9eUL,
219 0x19f784UL, 0x199f6aUL, 0x194750UL, 0x18ef36UL, 0x18971cUL, 0x183f02UL,
220 0x17e6e8UL, 0x178eceUL, 0x1736b4UL, 0x16de9aUL, 0x168680UL, 0x162e66UL,
221 0x15d64cUL, 0x157e32UL, 0x152618UL, 0x14cdfeUL, 0x1475e4UL, 0x141dcaUL,
222 0x13c5b0UL, 0x136d96UL, 0x13157cUL, 0x12bd62UL, 0x126548UL, 0x120d2eUL,
223 0x11b514UL, 0x115cfaUL, 0x1104e0UL, 0x10acc6UL, 0x1054acUL, 0xffc92UL,
224 0xfa478UL, 0xf4c5eUL, 0xef444UL, 0xe9c2aUL, 0xe4410UL, 0xdebf6UL,
225 0xd93dcUL, 0xd3bc2UL, 0xce3a8UL, 0xc8b8eUL, 0xc3374UL, 0xbdb5aUL,
226 0xb8340UL, 0xb2b26UL, 0xad30cUL, 0xa7af2UL, 0xa22d8UL, 0x9cabeUL,
227 0x972a4UL, 0x91a8aUL, 0x8c270UL, 0x86a56UL, 0x8123cUL, 0x7ba22UL,
228 0x76208UL, 0x709eeUL, 0x6b1d4UL, 0x659baUL, 0x601a0UL, 0x5a986UL,
229 0x5516cUL, 0x4f952UL, 0x4a138UL, 0x4491eUL, 0x3f104UL, 0x398eaUL,
230 0x340d0UL, 0x2e8b6UL, 0x2909cUL, 0x23882UL, 0x1e068UL, 0x1884eUL,
231 0x13034UL, 0xd81aUL, 0x8000UL, 0x27e6UL, 0xffffcfccUL, 0xffff77b2UL,
232 0xffff1f98UL, 0xfffec77eUL, 0xfffe6f64UL, 0xfffe174aUL, 0xfffdbf30UL, 0xfffd6716UL,
233 0xfffd0efcUL, 0xfffcb6e2UL, 0xfffc5ec8UL, 0xfffc06aeUL, 0xfffbae94UL, 0xfffb567aUL,
234 0xfffafe60UL, 0xfffaa646UL, 0xfffa4e2cUL, 0xfff9f612UL, 0xfff99df8UL, 0xfff945deUL,
235 0xfff8edc4UL, 0xfff895aaUL, 0xfff83d90UL, 0xfff7e576UL, 0xfff78d5cUL, 0xfff73542UL,
236 0xfff6dd28UL, 0xfff6850eUL, 0xfff62cf4UL, 0xfff5d4daUL, 0xfff57cc0UL, 0xfff524a6UL,
237 0xfff4cc8cUL, 0xfff47472UL, 0xfff41c58UL, 0xfff3c43eUL, 0xfff36c24UL, 0xfff3140aUL,
238 0xfff2bbf0UL, 0xfff263d6UL, 0xfff20bbcUL, 0xfff1b3a2UL, 0xfff15b88UL, 0xfff1036eUL,
239 0xfff0ab54UL, 0xfff0533aUL, 0xffeffb20UL, 0xffefa306UL, 0xffef4aecUL, 0xffeef2d2UL,
240 0xffee9ab8UL, 0xffee429eUL, 0xffedea84UL, 0xffed926aUL, 0xffed3a50UL, 0xffece236UL,
241 0xffec8a1cUL, 0xffec3202UL, 0xffebd9e8UL, 0xffeb81ceUL, 0xffeb29b4UL, 0xffead19aUL,
242 0xffea7980UL, 0xffea2166UL, 0xffe9c94cUL, 0xffe97132UL, 0xffe91918UL, 0xffe8c0feUL,
243 0xffe868e4UL, 0xffe810caUL, 0xffe7b8b0UL, 0xffe76096UL, 0xffe7087cUL, 0xffe6b062UL,
244 0xffe65848UL, 0xffe6002eUL, 0xffe5a814UL, 0xffe54ffaUL, 0xffe4f7e0UL, 0xffe49fc6UL,
245 0xffe447acUL, 0xffe3ef92UL, 0xffe39778UL, 0xffe33f5eUL, 0xffe2e744UL, 0xffe28f2aUL,
246 0xffe23710UL, 0xffe1def6UL, 0xffe186dcUL, 0xffe12ec2UL, 0xffe0d6a8UL, 0xffe07e8eUL,
247 0xffe02674UL, 0xffdfce5aUL, 0xffdf7640UL, 0xffdf1e26UL, 0xffdec60cUL, 0xffde6df2UL,
248 0xffde15d8UL, 0xffddbdbeUL, 0xffdd65a4UL, 0xffdd0d8aUL, 0xffdcb570UL, 0xffdc5d56UL,
249 0xffdc053cUL, 0xffdbad22UL, 0xffdb5508UL, 0xffdafceeUL, 0xffdaa4d4UL, 0xffda4cbaUL,
250 0xffd9f4a0UL, 0xffd99c86UL, 0xffd9446cUL, 0xffd8ec52UL, 0xffd89438UL, 0xffd83c1eUL,
251 0xffd7e404UL, 0xffd78beaUL, 0xffd733d0UL, 0xffd6dbb6UL, 0xffd6839cUL, 0xffd62b82UL,
252 0xffd5d368UL, 0xffd57b4eUL, 0xffd52334UL, 0xffd4cb1aUL
253 };
254
255 /*
256 * Initialize tables for YCC->RGB colorspace conversion.
257 */
258
259 LOCAL(void)
260 build_ycc_rgb_table (j_decompress_ptr cinfo)
261 {
262
263 /* The code below was used to generate the static tables above */
264
265 #if 0
266 my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
267 int i;
268 INT32 x;
269 SHIFT_TEMPS
270
271 cconvert->Cr_r_tab = (int *)
272 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
273 (MAXJSAMPLE+1) * SIZEOF(int));
274 cconvert->Cb_b_tab = (int *)
275 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
276 (MAXJSAMPLE+1) * SIZEOF(int));
277 cconvert->Cr_g_tab = (INT32 *)
278 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
279 (MAXJSAMPLE+1) * SIZEOF(INT32));
280 cconvert->Cb_g_tab = (INT32 *)
281 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
282 (MAXJSAMPLE+1) * SIZEOF(INT32));
283
284 for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) {
285 /* i is the actual input pixel value, in the range 0..MAXJSAMPLE */
286 /* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */
287 /* Cr=>R value is nearest int to 1.40200 * x */
288 cconvert->Cr_r_tab[i] = (int)
289 RIGHT_SHIFT(FIX(1.40200) * x + ONE_HALF, SCALEBITS);
290 /* Cb=>B value is nearest int to 1.77200 * x */
291 cconvert->Cb_b_tab[i] = (int)
292 RIGHT_SHIFT(FIX(1.77200) * x + ONE_HALF, SCALEBITS);
293 /* Cr=>G value is scaled-up -0.71414 * x */
294 cconvert->Cr_g_tab[i] = (- FIX(0.71414)) * x;
295 /* Cb=>G value is scaled-up -0.34414 * x */
296 /* We also add in ONE_HALF so that need not do it in inner loop */
297 cconvert->Cb_g_tab[i] = (- FIX(0.34414)) * x + ONE_HALF;
298 }
299 #endif /* 0 */
300 }
301
302
303 /*
304 * Convert some rows of samples to the output colorspace.
305 *
306 * Note that we change from noninterleaved, one-plane-per-component format
307 * to interleaved-pixel format. The output buffer is therefore three times
308 * as wide as the input buffer.
309 * A starting row offset is provided only for the input buffer. The caller
310 * can easily adjust the passed output_buf value to accommodate any row
311 * offset required on that side.
312 */
313
314 METHODDEF(void)
315 ycc_rgb_convert (j_decompress_ptr cinfo,
316 JSAMPIMAGE input_buf, JDIMENSION input_row,
317 JSAMPARRAY output_buf, int num_rows)
318 {
319 my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
320 register int y, cb, cr;
321 JSAMPLE * range_limit_y;
322 JSAMPROW outptr;
323 JSAMPROW inptr0, inptr1, inptr2;
324 JDIMENSION col;
325 JDIMENSION num_cols = cinfo->output_width;
326 JSAMPLE * range_limit = cinfo->sample_range_limit;
327 SHIFT_TEMPS
328
329 while (--num_rows >= 0) {
330 inptr0 = input_buf[0][input_row];
331 inptr1 = input_buf[1][input_row];
332 inptr2 = input_buf[2][input_row];
333 input_row++;
334 outptr = *output_buf++;
335 for (col = 0; col < num_cols; col++) {
336 y = GETJSAMPLE(inptr0[col]);
337 cb = GETJSAMPLE(inptr1[col]);
338 cr = GETJSAMPLE(inptr2[col]);
339 range_limit_y = range_limit + y;
340 /* Range-limiting is essential due to noise introduced by DCT losses. */
341 outptr[RGB_RED] = range_limit_y[Cr_r_tab[cr]];
342 outptr[RGB_GREEN] = range_limit_y[
343 ((int) RIGHT_SHIFT(Cb_g_tab[cb] + Cr_g_tab[cr],
344 SCALEBITS))];
345 outptr[RGB_BLUE] = range_limit_y[Cb_b_tab[cb]];
346 outptr += RGB_PIXELSIZE;
347 }
348 }
349 }
350
351
352 /**************** Cases other than YCbCr -> RGB **************/
353
354
355 /*
356 * Color conversion for no colorspace change: just copy the data,
357 * converting from separate-planes to interleaved representation.
358 */
359
360 METHODDEF(void)
361 null_convert (j_decompress_ptr cinfo,
362 JSAMPIMAGE input_buf, JDIMENSION input_row,
363 JSAMPARRAY output_buf, int num_rows)
364 {
365 register JSAMPROW inptr, outptr;
366 register JDIMENSION count;
367 register int num_components = cinfo->num_components;
368 JDIMENSION num_cols = cinfo->output_width;
369 int ci;
370
371 while (--num_rows >= 0) {
372 for (ci = 0; ci < num_components; ci++) {
373 inptr = input_buf[ci][input_row];
374 outptr = output_buf[0] + ci;
375 for (count = num_cols; count > 0; count--) {
376 *outptr = *inptr++; /* needn't bother with GETJSAMPLE() here */
377 outptr += num_components;
378 }
379 }
380 input_row++;
381 output_buf++;
382 }
383 }
384
385
386 /*
387 * Color conversion for grayscale: just copy the data.
388 * This also works for YCbCr -> grayscale conversion, in which
389 * we just copy the Y (luminance) component and ignore chrominance.
390 */
391
392 METHODDEF(void)
393 grayscale_convert (j_decompress_ptr cinfo,
394 JSAMPIMAGE input_buf, JDIMENSION input_row,
395 JSAMPARRAY output_buf, int num_rows)
396 {
397 jcopy_sample_rows(input_buf[0], (int) input_row, output_buf, 0,
398 num_rows, cinfo->output_width);
399 }
400
401
402 /*
403 * Convert grayscale to RGB: just duplicate the graylevel three times.
404 * This is provided to support applications that don't want to cope
405 * with grayscale as a separate case.
406 */
407
408 METHODDEF(void)
409 gray_rgb_convert (j_decompress_ptr cinfo,
410 JSAMPIMAGE input_buf, JDIMENSION input_row,
411 JSAMPARRAY output_buf, int num_rows)
412 {
413 register JSAMPROW inptr, outptr;
414 register JDIMENSION col;
415 JDIMENSION num_cols = cinfo->output_width;
416
417 while (--num_rows >= 0) {
418 inptr = input_buf[0][input_row++];
419 outptr = *output_buf++;
420 for (col = 0; col < num_cols; col++) {
421 /* We can dispense with GETJSAMPLE() here */
422 outptr[RGB_RED] = outptr[RGB_GREEN] = outptr[RGB_BLUE] = inptr[col];
423 outptr += RGB_PIXELSIZE;
424 }
425 }
426 }
427
428
429 /*
430 * Adobe-style YCCK->CMYK conversion.
431 * We convert YCbCr to R=1-C, G=1-M, and B=1-Y using the same
432 * conversion as above, while passing K (black) unchanged.
433 */
434
435 METHODDEF(void)
436 ycck_cmyk_convert (j_decompress_ptr cinfo,
437 JSAMPIMAGE input_buf, JDIMENSION input_row,
438 JSAMPARRAY output_buf, int num_rows)
439 {
440 my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
441 register int y, cb, cr;
442 register JSAMPROW outptr;
443 register JSAMPROW inptr0, inptr1, inptr2, inptr3;
444 register JDIMENSION col;
445 JDIMENSION num_cols = cinfo->output_width;
446 /* copy these pointers into registers if possible */
447 register JSAMPLE * range_limit = cinfo->sample_range_limit;
448 SHIFT_TEMPS
449
450 while (--num_rows >= 0) {
451 inptr0 = input_buf[0][input_row];
452 inptr1 = input_buf[1][input_row];
453 inptr2 = input_buf[2][input_row];
454 inptr3 = input_buf[3][input_row];
455 input_row++;
456 outptr = *output_buf++;
457 for (col = 0; col < num_cols; col++) {
458 y = GETJSAMPLE(inptr0[col]);
459 cb = GETJSAMPLE(inptr1[col]);
460 cr = GETJSAMPLE(inptr2[col]);
461 /* Range-limiting is essential due to noise introduced by DCT losses. */
462 outptr[0] = range_limit[MAXJSAMPLE - (y + Cr_r_tab[cr])]; /* red */
463 outptr[1] = range_limit[MAXJSAMPLE - (y + /* green */
464 ((int) RIGHT_SHIFT(Cb_g_tab[cb] + Cr_g_tab[cr],
465 SCALEBITS)))];
466 outptr[2] = range_limit[MAXJSAMPLE - (y + Cb_b_tab[cb])]; /* blue */
467 /* K passes through unchanged */
468 outptr[3] = inptr3[col]; /* don't need GETJSAMPLE here */
469 outptr += 4;
470 }
471 }
472 }
473
474
475 /*
476 * Empty method for start_pass.
477 */
478
479 METHODDEF(void)
480 start_pass_dcolor (j_decompress_ptr cinfo)
481 {
482 /* no work needed */
483 }
484
485
486 /*
487 * Module initialization routine for output colorspace conversion.
488 */
489
490 GLOBAL(void)
491 jinit_color_deconverter (j_decompress_ptr cinfo)
492 {
493 my_cconvert_ptr cconvert;
494 int ci;
495
496 cconvert = (my_cconvert_ptr)
497 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
498 SIZEOF(my_color_deconverter));
499 cinfo->cconvert = (struct jpeg_color_deconverter *) cconvert;
500 cconvert->pub.start_pass = start_pass_dcolor;
501
502 /* Make sure num_components agrees with jpeg_color_space */
503 switch (cinfo->jpeg_color_space) {
504 case JCS_GRAYSCALE:
505 if (cinfo->num_components != 1)
506 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
507 break;
508
509 case JCS_RGB:
510 case JCS_YCbCr:
511 if (cinfo->num_components != 3)
512 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
513 break;
514
515 case JCS_CMYK:
516 case JCS_YCCK:
517 if (cinfo->num_components != 4)
518 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
519 break;
520
521 default: /* JCS_UNKNOWN can be anything */
522 if (cinfo->num_components < 1)
523 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
524 break;
525 }
526
527 /* Set out_color_components and conversion method based on requested space.
528 * Also clear the component_needed flags for any unused components,
529 * so that earlier pipeline stages can avoid useless computation.
530 */
531
532 switch (cinfo->out_color_space) {
533 case JCS_GRAYSCALE:
534 cinfo->out_color_components = 1;
535 if (cinfo->jpeg_color_space == JCS_GRAYSCALE ||
536 cinfo->jpeg_color_space == JCS_YCbCr) {
537 cconvert->pub.color_convert = grayscale_convert;
538 /* For color->grayscale conversion, only the Y (0) component is needed */
539 for (ci = 1; ci < cinfo->num_components; ci++)
540 cinfo->comp_info[ci].component_needed = FALSE;
541 } else
542 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
543 break;
544
545 case JCS_RGB:
546 cinfo->out_color_components = RGB_PIXELSIZE;
547 if (cinfo->jpeg_color_space == JCS_YCbCr) {
548 cconvert->pub.color_convert = ycc_rgb_convert;
549 build_ycc_rgb_table(cinfo);
550 } else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) {
551 cconvert->pub.color_convert = gray_rgb_convert;
552 } else if (cinfo->jpeg_color_space == JCS_RGB && RGB_PIXELSIZE == 3) {
553 cconvert->pub.color_convert = null_convert;
554 } else
555 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
556 break;
557
558 case JCS_CMYK:
559 cinfo->out_color_components = 4;
560 if (cinfo->jpeg_color_space == JCS_YCCK) {
561 cconvert->pub.color_convert = ycck_cmyk_convert;
562 build_ycc_rgb_table(cinfo);
563 } else if (cinfo->jpeg_color_space == JCS_CMYK) {
564 cconvert->pub.color_convert = null_convert;
565 } else
566 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
567 break;
568
569 default:
570 /* Permit null conversion to same output space */
571 if (cinfo->out_color_space == cinfo->jpeg_color_space) {
572 cinfo->out_color_components = cinfo->num_components;
573 cconvert->pub.color_convert = null_convert;
574 } else /* unsupported non-null conversion */
575 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
576 break;
577 }
578
579 if (cinfo->quantize_colors)
580 cinfo->output_components = 1; /* single colormapped output component */
581 else
582 cinfo->output_components = cinfo->out_color_components;
583 }
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