keep the PID file locked for the lifetime of the process
[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 "vnc-palette.h"
30
31 static VncPaletteEntry *palette_find(const VncPalette *palette,
32 uint32_t color, unsigned int hash)
33 {
34 VncPaletteEntry *entry;
35
36 QLIST_FOREACH(entry, &palette->table[hash], next) {
37 if (entry->color == color) {
38 return entry;
39 }
40 }
41
42 return NULL;
43 }
44
45 static unsigned int palette_hash(uint32_t rgb, int bpp)
46 {
47 if (bpp == 16) {
48 return ((unsigned int)(((rgb >> 8) + rgb) & 0xFF));
49 } else {
50 return ((unsigned int)(((rgb >> 16) + (rgb >> 8)) & 0xFF));
51 }
52 }
53
54 VncPalette *palette_new(size_t max, int bpp)
55 {
56 VncPalette *palette;
57
58 palette = g_malloc0(sizeof(*palette));
59 palette_init(palette, max, bpp);
60 return palette;
61 }
62
63 void palette_init(VncPalette *palette, size_t max, int bpp)
64 {
65 memset(palette, 0, sizeof (*palette));
66 palette->max = max;
67 palette->bpp = bpp;
68 }
69
70 void palette_destroy(VncPalette *palette)
71 {
72 g_free(palette);
73 }
74
75 int palette_put(VncPalette *palette, uint32_t color)
76 {
77 unsigned int hash;
78 unsigned int idx = palette->size;
79 VncPaletteEntry *entry;
80
81 hash = palette_hash(color, palette->bpp) % VNC_PALETTE_HASH_SIZE;
82 entry = palette_find(palette, color, hash);
83
84 if (!entry && palette->size >= palette->max) {
85 return 0;
86 }
87 if (!entry) {
88 VncPaletteEntry *entry;
89
90 entry = &palette->pool[palette->size];
91 entry->color = color;
92 entry->idx = idx;
93 QLIST_INSERT_HEAD(&palette->table[hash], entry, next);
94 palette->size++;
95 }
96 return palette->size;
97 }
98
99 int palette_idx(const VncPalette *palette, uint32_t color)
100 {
101 VncPaletteEntry *entry;
102 unsigned int hash;
103
104 hash = palette_hash(color, palette->bpp) % VNC_PALETTE_HASH_SIZE;
105 entry = palette_find(palette, color, hash);
106 return (entry == NULL ? -1 : entry->idx);
107 }
108
109 size_t palette_size(const VncPalette *palette)
110 {
111 return palette->size;
112 }
113
114 void palette_iter(const VncPalette *palette,
115 void (*iter)(int idx, uint32_t color, void *opaque),
116 void *opaque)
117 {
118 int i;
119 VncPaletteEntry *entry;
120
121 for (i = 0; i < VNC_PALETTE_HASH_SIZE; i++) {
122 QLIST_FOREACH(entry, &palette->table[i], next) {
123 iter(entry->idx, entry->color, opaque);
124 }
125 }
126 }
127
128 uint32_t palette_color(const VncPalette *palette, int idx, bool *found)
129 {
130 int i;
131 VncPaletteEntry *entry;
132
133 for (i = 0; i < VNC_PALETTE_HASH_SIZE; i++) {
134 QLIST_FOREACH(entry, &palette->table[i], next) {
135 if (entry->idx == idx) {
136 *found = true;
137 return entry->color;
138 }
139 }
140 }
141
142 *found = false;
143 return -1;
144 }
145
146 static void palette_fill_cb(int idx, uint32_t color, void *opaque)
147 {
148 uint32_t *colors = opaque;
149
150 colors[idx] = color;
151 }
152
153 size_t palette_fill(const VncPalette *palette,
154 uint32_t colors[VNC_PALETTE_MAX_SIZE])
155 {
156 palette_iter(palette, palette_fill_cb, colors);
157 return palette_size(palette);
158 }