migration: rename unix.c to socket.c
[qemu.git] / ui / vnc-palette.c
1 /*
2 * QEMU VNC display driver: palette hash table
3 *
4 * From libvncserver/libvncserver/tight.c
5 * Copyright (C) 2000, 2001 Const Kaplinsky. All Rights Reserved.
6 * Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved.
7 *
8 * Copyright (C) 2010 Corentin Chary <corentin.chary@gmail.com>
9 *
10 * Permission is hereby granted, free of charge, to any person obtaining a copy
11 * of this software and associated documentation files (the "Software"), to deal
12 * in the Software without restriction, including without limitation the rights
13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
14 * copies of the Software, and to permit persons to whom the Software is
15 * furnished to do so, subject to the following conditions:
16 *
17 * The above copyright notice and this permission notice shall be included in
18 * all copies or substantial portions of the Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
26 * THE SOFTWARE.
27 */
28
29 #include "qemu/osdep.h"
30 #include "vnc-palette.h"
31 #include <glib.h>
32
33 static VncPaletteEntry *palette_find(const VncPalette *palette,
34 uint32_t color, unsigned int hash)
35 {
36 VncPaletteEntry *entry;
37
38 QLIST_FOREACH(entry, &palette->table[hash], next) {
39 if (entry->color == color) {
40 return entry;
41 }
42 }
43
44 return NULL;
45 }
46
47 static unsigned int palette_hash(uint32_t rgb, int bpp)
48 {
49 if (bpp == 16) {
50 return ((unsigned int)(((rgb >> 8) + rgb) & 0xFF));
51 } else {
52 return ((unsigned int)(((rgb >> 16) + (rgb >> 8)) & 0xFF));
53 }
54 }
55
56 VncPalette *palette_new(size_t max, int bpp)
57 {
58 VncPalette *palette;
59
60 palette = g_malloc0(sizeof(*palette));
61 palette_init(palette, max, bpp);
62 return palette;
63 }
64
65 void palette_init(VncPalette *palette, size_t max, int bpp)
66 {
67 memset(palette, 0, sizeof (*palette));
68 palette->max = max;
69 palette->bpp = bpp;
70 }
71
72 void palette_destroy(VncPalette *palette)
73 {
74 g_free(palette);
75 }
76
77 int palette_put(VncPalette *palette, uint32_t color)
78 {
79 unsigned int hash;
80 unsigned int idx = palette->size;
81 VncPaletteEntry *entry;
82
83 hash = palette_hash(color, palette->bpp) % VNC_PALETTE_HASH_SIZE;
84 entry = palette_find(palette, color, hash);
85
86 if (!entry && palette->size >= palette->max) {
87 return 0;
88 }
89 if (!entry) {
90 VncPaletteEntry *entry;
91
92 entry = &palette->pool[palette->size];
93 entry->color = color;
94 entry->idx = idx;
95 QLIST_INSERT_HEAD(&palette->table[hash], entry, next);
96 palette->size++;
97 }
98 return palette->size;
99 }
100
101 int palette_idx(const VncPalette *palette, uint32_t color)
102 {
103 VncPaletteEntry *entry;
104 unsigned int hash;
105
106 hash = palette_hash(color, palette->bpp) % VNC_PALETTE_HASH_SIZE;
107 entry = palette_find(palette, color, hash);
108 return (entry == NULL ? -1 : entry->idx);
109 }
110
111 size_t palette_size(const VncPalette *palette)
112 {
113 return palette->size;
114 }
115
116 void palette_iter(const VncPalette *palette,
117 void (*iter)(int idx, uint32_t color, void *opaque),
118 void *opaque)
119 {
120 int i;
121 VncPaletteEntry *entry;
122
123 for (i = 0; i < VNC_PALETTE_HASH_SIZE; i++) {
124 QLIST_FOREACH(entry, &palette->table[i], next) {
125 iter(entry->idx, entry->color, opaque);
126 }
127 }
128 }
129
130 uint32_t palette_color(const VncPalette *palette, int idx, bool *found)
131 {
132 int i;
133 VncPaletteEntry *entry;
134
135 for (i = 0; i < VNC_PALETTE_HASH_SIZE; i++) {
136 QLIST_FOREACH(entry, &palette->table[i], next) {
137 if (entry->idx == idx) {
138 *found = true;
139 return entry->color;
140 }
141 }
142 }
143
144 *found = false;
145 return -1;
146 }
147
148 static void palette_fill_cb(int idx, uint32_t color, void *opaque)
149 {
150 uint32_t *colors = opaque;
151
152 colors[idx] = color;
153 }
154
155 size_t palette_fill(const VncPalette *palette,
156 uint32_t colors[VNC_PALETTE_MAX_SIZE])
157 {
158 palette_iter(palette, palette_fill_cb, colors);
159 return palette_size(palette);
160 }