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/*
* QEMU VNC display driver: palette hash table
*
* From libvncserver/libvncserver/tight.c
* Copyright (C) 2000, 2001 Const Kaplinsky. All Rights Reserved.
* Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved.
*
* Copyright (C) 2010 Corentin Chary <corentin.chary@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "vnc-palette.h"
static VncPaletteEntry *palette_find(const VncPalette *palette,
uint32_t color, unsigned int hash)
{
VncPaletteEntry *entry;
QLIST_FOREACH(entry, &palette->table[hash], next) {
if (entry->color == color) {
return entry;
}
}
return NULL;
}
static unsigned int palette_hash(uint32_t rgb, int bpp)
{
if (bpp == 16) {
return ((unsigned int)(((rgb >> 8) + rgb) & 0xFF));
} else {
return ((unsigned int)(((rgb >> 16) + (rgb >> 8)) & 0xFF));
}
}
VncPalette *palette_new(size_t max, int bpp)
{
VncPalette *palette;
palette = qemu_mallocz(sizeof(*palette));
palette_init(palette, max, bpp);
return palette;
}
void palette_init(VncPalette *palette, size_t max, int bpp)
{
memset(palette, 0, sizeof (*palette));
palette->max = max;
palette->bpp = bpp;
}
void palette_destroy(VncPalette *palette)
{
if (palette == NULL) {
qemu_free(palette);
}
}
int palette_put(VncPalette *palette, uint32_t color)
{
unsigned int hash;
unsigned int idx = palette->size;
VncPaletteEntry *entry;
hash = palette_hash(color, palette->bpp) % VNC_PALETTE_HASH_SIZE;
entry = palette_find(palette, color, hash);
if (!entry && palette->size >= palette->max) {
return 0;
}
if (!entry) {
VncPaletteEntry *entry;
entry = &palette->pool[palette->size];
entry->color = color;
entry->idx = idx;
QLIST_INSERT_HEAD(&palette->table[hash], entry, next);
palette->size++;
}
return palette->size;
}
int palette_idx(const VncPalette *palette, uint32_t color)
{
VncPaletteEntry *entry;
unsigned int hash;
hash = palette_hash(color, palette->bpp) % VNC_PALETTE_HASH_SIZE;
entry = palette_find(palette, color, hash);
return (entry == NULL ? -1 : entry->idx);
}
size_t palette_size(const VncPalette *palette)
{
return palette->size;
}
void palette_iter(const VncPalette *palette,
void (*iter)(int idx, uint32_t color, void *opaque),
void *opaque)
{
int i;
VncPaletteEntry *entry;
for (i = 0; i < VNC_PALETTE_HASH_SIZE; i++) {
QLIST_FOREACH(entry, &palette->table[i], next) {
iter(entry->idx, entry->color, opaque);
}
}
}
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