Adding upstream version 3.50~pre5.
[syslinux-debian/hramrach.git] / com32 / lib / jpeg / grey.c
blob0034ce2ba163e7b6e09e35b1783af6d451d2c295
1 /*
2 * Small jpeg decoder library
4 * Copyright (c) 2006, Luc Saillard <luc@saillard.org>
5 * All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
9 * - Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
12 * - Redistributions in binary form must reproduce the above copyright notice,
13 * this list of conditions and the following disclaimer in the documentation
14 * and/or other materials provided with the distribution.
16 * - Neither the name of the author nor the names of its contributors may be
17 * used to endorse or promote products derived from this software without
18 * specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <stdint.h>
39 #include "tinyjpeg.h"
40 #include "tinyjpeg-internal.h"
42 /**
43 * YCrCb -> Grey (1x1)
44 * .---.
45 * | 1 |
46 * `---'
48 static void YCrCB_to_Grey_1x1(struct jdec_private *priv)
50 const unsigned char *y;
51 unsigned char *p;
52 unsigned int i;
53 int offset_to_next_row;
55 p = priv->plane[0];
56 y = priv->Y;
57 offset_to_next_row = priv->bytes_per_row[0];
59 for (i=0; i<8; i++) {
60 memcpy(p, y, 8);
61 y+=8;
62 p += offset_to_next_row;
66 /**
67 * YCrCb -> Grey (2x1)
68 * .-------.
69 * | 1 | 2 |
70 * `-------'
72 static void YCrCB_to_Grey_2x1(struct jdec_private *priv)
74 const unsigned char *y;
75 unsigned char *p;
76 unsigned int i;
77 int offset_to_next_row;
79 p = priv->plane[0];
80 y = priv->Y;
81 offset_to_next_row = priv->bytes_per_row[0];
83 for (i=0; i<8; i++) {
84 memcpy(p, y, 16);
85 y += 16;
86 p += offset_to_next_row;
91 /**
92 * YCrCb -> Grey (1x2)
93 * .---.
94 * | 1 |
95 * |---|
96 * | 2 |
97 * `---'
99 static void YCrCB_to_Grey_1x2(struct jdec_private *priv)
101 const unsigned char *y;
102 unsigned char *p;
103 unsigned int i;
104 int offset_to_next_row;
106 p = priv->plane[0];
107 y = priv->Y;
108 offset_to_next_row = priv->bytes_per_row[0];
110 for (i=0; i<16; i++) {
111 memcpy(p, y, 8);
112 y += 8;
113 p += offset_to_next_row;
118 * YCrCb -> Grey (2x2)
119 * .-------.
120 * | 1 | 2 |
121 * |---+---|
122 * | 3 | 4 |
123 * `-------'
125 static void YCrCB_to_Grey_2x2(struct jdec_private *priv)
127 const unsigned char *y;
128 unsigned char *p;
129 unsigned int i;
130 int offset_to_next_row;
132 p = priv->plane[0];
133 y = priv->Y;
134 offset_to_next_row = priv->bytes_per_row[0];
136 for (i=0; i<16; i++) {
137 memcpy(p, y, 16);
138 y += 16;
139 p += offset_to_next_row;
143 static int initialize_grey(struct jdec_private *priv,
144 unsigned int *bytes_per_blocklines,
145 unsigned int *bytes_per_mcu)
147 if (priv->components[0] == NULL)
148 priv->components[0] = (uint8_t *)malloc(priv->width * priv->height * 3);
149 if (!priv->bytes_per_row[0])
150 priv->bytes_per_row[0] = priv->width * 3;
152 bytes_per_blocklines[0] = priv->bytes_per_row[0];
153 bytes_per_mcu[0] = 3*8;
155 return !priv->components[0];
158 static const struct tinyjpeg_colorspace format_grey =
161 YCrCB_to_Grey_1x1,
162 YCrCB_to_Grey_1x2,
163 YCrCB_to_Grey_2x1,
164 YCrCB_to_Grey_2x2,
166 tinyjpeg_decode_mcu_1comp_table,
167 initialize_grey
170 const tinyjpeg_colorspace_t TINYJPEG_FMT_GREY = &format_grey;