Merge remote-tracking branch 'remotes/kraxel/tags/pull-vga-20170103-1' into staging
[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
32 static VncPaletteEntry *palette_find(const VncPalette *palette,
33 uint32_t color, unsigned int hash)
34 {
35 VncPaletteEntry *entry;
36
37 QLIST_FOREACH(entry, &palette->table[hash], next) {
38 if (entry->color == color) {
39 return entry;
40 }
41 }
42
43 return NULL;
44 }
45
46 static unsigned int palette_hash(uint32_t rgb, int bpp)
47 {
48 if (bpp == 16) {
49 return ((unsigned int)(((rgb >> 8) + rgb) & 0xFF));
50 } else {
51 return ((unsigned int)(((rgb >> 16) + (rgb >> 8)) & 0xFF));
52 }
53 }
54
55 VncPalette *palette_new(size_t max, int bpp)
56 {
57 VncPalette *palette;
58
59 palette = g_malloc0(sizeof(*palette));
60 palette_init(palette, max, bpp);
61 return palette;
62 }
63
64 void palette_init(VncPalette *palette, size_t max, int bpp)
65 {
66 memset(palette, 0, sizeof (*palette));
67 palette->max = max;
68 palette->bpp = bpp;
69 }
70
71 void palette_destroy(VncPalette *palette)
72 {
73 g_free(palette);
74 }
75
76 int palette_put(VncPalette *palette, uint32_t color)
77 {
78 unsigned int hash;
79 unsigned int idx = palette->size;
80 VncPaletteEntry *entry;
81
82 hash = palette_hash(color, palette->bpp) % VNC_PALETTE_HASH_SIZE;
83 entry = palette_find(palette, color, hash);
84
85 if (!entry && palette->size >= palette->max) {
86 return 0;
87 }
88 if (!entry) {
89 VncPaletteEntry *entry;
90
91 entry = &palette->pool[palette->size];
92 entry->color = color;
93 entry->idx = idx;
94 QLIST_INSERT_HEAD(&palette->table[hash], entry, next);
95 palette->size++;
96 }
97 return palette->size;
98 }
99
100 int palette_idx(const VncPalette *palette, uint32_t color)
101 {
102 VncPaletteEntry *entry;
103 unsigned int hash;
104
105 hash = palette_hash(color, palette->bpp) % VNC_PALETTE_HASH_SIZE;
106 entry = palette_find(palette, color, hash);
107 return (entry == NULL ? -1 : entry->idx);
108 }
109
110 size_t palette_size(const VncPalette *palette)
111 {
112 return palette->size;
113 }
114
115 void palette_iter(const VncPalette *palette,
116 void (*iter)(int idx, uint32_t color, void *opaque),
117 void *opaque)
118 {
119 int i;
120 VncPaletteEntry *entry;
121
122 for (i = 0; i < VNC_PALETTE_HASH_SIZE; i++) {
123 QLIST_FOREACH(entry, &palette->table[i], next) {
124 iter(entry->idx, entry->color, opaque);
125 }
126 }
127 }
128
129 uint32_t palette_color(const VncPalette *palette, int idx, bool *found)
130 {
131 int i;
132 VncPaletteEntry *entry;
133
134 for (i = 0; i < VNC_PALETTE_HASH_SIZE; i++) {
135 QLIST_FOREACH(entry, &palette->table[i], next) {
136 if (entry->idx == idx) {
137 *found = true;
138 return entry->color;
139 }
140 }
141 }
142
143 *found = false;
144 return -1;
145 }
146
147 static void palette_fill_cb(int idx, uint32_t color, void *opaque)
148 {
149 uint32_t *colors = opaque;
150
151 colors[idx] = color;
152 }
153
154 size_t palette_fill(const VncPalette *palette,
155 uint32_t colors[VNC_PALETTE_MAX_SIZE])
156 {
157 palette_iter(palette, palette_fill_cb, colors);
158 return palette_size(palette);
159 }