/* * 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 = g_malloc0(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) { g_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); } } } uint32_t palette_color(const VncPalette *palette, int idx, bool *found) { int i; VncPaletteEntry *entry; for (i = 0; i < VNC_PALETTE_HASH_SIZE; i++) { QLIST_FOREACH(entry, &palette->table[i], next) { if (entry->idx == idx) { *found = true; return entry->color; } } } *found = false; return -1; } static void palette_fill_cb(int idx, uint32_t color, void *opaque) { uint32_t *colors = opaque; colors[idx] = color; } size_t palette_fill(const VncPalette *palette, uint32_t colors[VNC_PALETTE_MAX_SIZE]) { palette_iter(palette, palette_fill_cb, colors); return palette_size(palette); }