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 "vnc-palette.h"
  30#include <glib.h>
  31#include <string.h>
  32
  33static VncPaletteEntry *palette_find(const VncPalette *palette,
  34                                     uint32_t color, unsigned int hash)
  35{
  36    VncPaletteEntry *entry;
  37
  38    QLIST_FOREACH(entry, &palette->table[hash], next) {
  39        if (entry->color == color) {
  40            return entry;
  41        }
  42    }
  43
  44    return NULL;
  45}
  46
  47static unsigned int palette_hash(uint32_t rgb, int bpp)
  48{
  49    if (bpp == 16) {
  50        return ((unsigned int)(((rgb >> 8) + rgb) & 0xFF));
  51    } else {
  52        return ((unsigned int)(((rgb >> 16) + (rgb >> 8)) & 0xFF));
  53    }
  54}
  55
  56VncPalette *palette_new(size_t max, int bpp)
  57{
  58    VncPalette *palette;
  59
  60    palette = g_malloc0(sizeof(*palette));
  61    palette_init(palette, max, bpp);
  62    return palette;
  63}
  64
  65void palette_init(VncPalette *palette, size_t max, int bpp)
  66{
  67    memset(palette, 0, sizeof (*palette));
  68    palette->max = max;
  69    palette->bpp = bpp;
  70}
  71
  72void palette_destroy(VncPalette *palette)
  73{
  74    g_free(palette);
  75}
  76
  77int palette_put(VncPalette *palette, uint32_t color)
  78{
  79    unsigned int hash;
  80    unsigned int idx = palette->size;
  81    VncPaletteEntry *entry;
  82
  83    hash = palette_hash(color, palette->bpp) % VNC_PALETTE_HASH_SIZE;
  84    entry = palette_find(palette, color, hash);
  85
  86    if (!entry && palette->size >= palette->max) {
  87        return 0;
  88    }
  89    if (!entry) {
  90        VncPaletteEntry *entry;
  91
  92        entry = &palette->pool[palette->size];
  93        entry->color = color;
  94        entry->idx = idx;
  95        QLIST_INSERT_HEAD(&palette->table[hash], entry, next);
  96        palette->size++;
  97    }
  98    return palette->size;
  99}
 100
 101int palette_idx(const VncPalette *palette, uint32_t color)
 102{
 103    VncPaletteEntry *entry;
 104    unsigned int hash;
 105
 106    hash = palette_hash(color, palette->bpp) % VNC_PALETTE_HASH_SIZE;
 107    entry = palette_find(palette, color, hash);
 108    return (entry == NULL ? -1 : entry->idx);
 109}
 110
 111size_t palette_size(const VncPalette *palette)
 112{
 113    return palette->size;
 114}
 115
 116void palette_iter(const VncPalette *palette,
 117                  void (*iter)(int idx, uint32_t color, void *opaque),
 118                  void *opaque)
 119{
 120    int i;
 121    VncPaletteEntry *entry;
 122
 123    for (i = 0; i < VNC_PALETTE_HASH_SIZE; i++) {
 124        QLIST_FOREACH(entry, &palette->table[i], next) {
 125            iter(entry->idx, entry->color, opaque);
 126        }
 127    }
 128}
 129
 130uint32_t palette_color(const VncPalette *palette, int idx, bool *found)
 131{
 132    int i;
 133    VncPaletteEntry *entry;
 134
 135    for (i = 0; i < VNC_PALETTE_HASH_SIZE; i++) {
 136        QLIST_FOREACH(entry, &palette->table[i], next) {
 137            if (entry->idx == idx) {
 138                *found = true;
 139                return entry->color;
 140            }
 141        }
 142    }
 143
 144    *found = false;
 145    return -1;
 146}
 147
 148static void palette_fill_cb(int idx, uint32_t color, void *opaque)
 149{
 150    uint32_t *colors = opaque;
 151
 152    colors[idx] = color;
 153}
 154
 155size_t palette_fill(const VncPalette *palette,
 156                    uint32_t colors[VNC_PALETTE_MAX_SIZE])
 157{
 158    palette_iter(palette, palette_fill_cb, colors);
 159    return palette_size(palette);
 160}
 161