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 } 160