LXR qemu/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
  32static 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
  46static 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
  55VncPalette *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
  64void 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
  71void palette_destroy(VncPalette *palette)
  72{
  73    g_free(palette);
  74}
  75
  76int 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
 100int 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
 110size_t palette_size(const VncPalette *palette)
 111{
 112    return palette->size;
 113}
 114
 115void 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
 129uint32_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
 147static void palette_fill_cb(int idx, uint32_t color, void *opaque)
 148{
 149    uint32_t *colors = opaque;
 150
 151    colors[idx] = color;
 152}
 153
 154size_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