Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Newer
Older
100644 137 lines (116 sloc) 3.935 kb
68396ea @rmustacc Initial commit of d32e8d0b8d9e0ef7cf7ab2e74548982972789dfc from qemu-kvm
rmustacc authored
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 = qemu_mallocz(sizeof(*palette));
59 palette->max = max;
60 palette->bpp = bpp;
61 return palette;
62 }
63
64 void palette_destroy(VncPalette *palette)
65 {
66 int i;
67
68 if (palette == NULL) {
69 return ;
70 }
71
72 for (i = 0; i < VNC_PALETTE_HASH_SIZE; i++) {
73 VncPaletteEntry *entry = QLIST_FIRST(&palette->table[i]);
74 while (entry) {
75 VncPaletteEntry *tmp = QLIST_NEXT(entry, next);
76 QLIST_REMOVE(entry, next);
77 qemu_free(entry);
78 entry = tmp;
79 }
80 }
81
82 qemu_free(palette);
83 }
84
85 int palette_put(VncPalette *palette, uint32_t color)
86 {
87 unsigned int hash;
88 unsigned int idx = palette->size;
89 VncPaletteEntry *entry;
90
91 hash = palette_hash(color, palette->bpp) % VNC_PALETTE_HASH_SIZE;
92 entry = palette_find(palette, color, hash);
93
94 if (!entry && palette->size >= palette->max) {
95 return 0;
96 }
97 if (!entry) {
98 VncPaletteEntry *entry;
99
100 entry = qemu_mallocz(sizeof(*entry));
101 entry->color = color;
102 entry->idx = idx;
103 QLIST_INSERT_HEAD(&palette->table[hash], entry, next);
104 palette->size++;
105 }
106 return palette->size;
107 }
108
109 int palette_idx(const VncPalette *palette, uint32_t color)
110 {
111 VncPaletteEntry *entry;
112 unsigned int hash;
113
114 hash = palette_hash(color, palette->bpp) % VNC_PALETTE_HASH_SIZE;
115 entry = palette_find(palette, color, hash);
116 return (entry == NULL ? -1 : entry->idx);
117 }
118
119 size_t palette_size(const VncPalette *palette)
120 {
121 return palette->size;
122 }
123
124 void palette_iter(const VncPalette *palette,
125 void (*iter)(int idx, uint32_t color, void *opaque),
126 void *opaque)
127 {
128 int i;
129 VncPaletteEntry *entry;
130
131 for (i = 0; i < VNC_PALETTE_HASH_SIZE; i++) {
132 QLIST_FOREACH(entry, &palette->table[i], next) {
133 iter(entry->idx, entry->color, opaque);
134 }
135 }
136 }
Something went wrong with that request. Please try again.