qemu

FORK: QEMU emulator
git clone https://git.neptards.moe/neptards/qemu.git
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vnc-palette.c (4446B)

      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 }