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Annotation of qemu/ui/vnc-palette.c, revision 1.1.1.1

1.1       root        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 <[email protected]>
                      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: 
                     31: static VncPaletteEntry *palette_find(const VncPalette *palette,
                     32:                                      uint32_t color, unsigned int hash)
                     33: {
                     34:     VncPaletteEntry *entry;
                     35: 
                     36:     QLIST_FOREACH(entry, &palette->table[hash], next) {
                     37:         if (entry->color == color) {
                     38:             return entry;
                     39:         }
                     40:     }
                     41: 
                     42:     return NULL;
                     43: }
                     44: 
                     45: static unsigned int palette_hash(uint32_t rgb, int bpp)
                     46: {
                     47:     if (bpp == 16) {
                     48:         return ((unsigned int)(((rgb >> 8) + rgb) & 0xFF));
                     49:     } else {
                     50:         return ((unsigned int)(((rgb >> 16) + (rgb >> 8)) & 0xFF));
                     51:     }
                     52: }
                     53: 
                     54: VncPalette *palette_new(size_t max, int bpp)
                     55: {
                     56:     VncPalette *palette;
                     57: 
                     58:     palette = qemu_mallocz(sizeof(*palette));
                     59:     palette->max = max;
                     60:     palette->bpp = bpp;
                     61:     return palette;
                     62: }
                     63: 
                     64: void palette_destroy(VncPalette *palette)
                     65: {
                     66:     int i;
                     67: 
                     68:     if (palette == NULL) {
                     69:         return ;
                     70:     }
                     71: 
                     72:     for (i = 0; i < VNC_PALETTE_HASH_SIZE; i++) {
                     73:         VncPaletteEntry *entry = QLIST_FIRST(&palette->table[i]);
                     74:         while (entry) {
                     75:             VncPaletteEntry *tmp = QLIST_NEXT(entry, next);
                     76:             QLIST_REMOVE(entry, next);
                     77:             qemu_free(entry);
                     78:             entry = tmp;
                     79:         }
                     80:     }
                     81: 
                     82:     qemu_free(palette);
                     83: }
                     84: 
                     85: int palette_put(VncPalette *palette, uint32_t color)
                     86: {
                     87:     unsigned int hash;
                     88:     unsigned int idx = palette->size;
                     89:     VncPaletteEntry *entry;
                     90: 
                     91:     hash = palette_hash(color, palette->bpp) % VNC_PALETTE_HASH_SIZE;
                     92:     entry = palette_find(palette, color, hash);
                     93: 
                     94:     if (!entry && palette->size >= palette->max) {
                     95:         return 0;
                     96:     }
                     97:     if (!entry) {
                     98:         VncPaletteEntry *entry;
                     99: 
                    100:         entry = qemu_mallocz(sizeof(*entry));
                    101:         entry->color = color;
                    102:         entry->idx = idx;
                    103:         QLIST_INSERT_HEAD(&palette->table[hash], entry, next);
                    104:         palette->size++;
                    105:     }
                    106:     return palette->size;
                    107: }
                    108: 
                    109: int palette_idx(const VncPalette *palette, uint32_t color)
                    110: {
                    111:     VncPaletteEntry *entry;
                    112:     unsigned int hash;
                    113: 
                    114:     hash = palette_hash(color, palette->bpp) % VNC_PALETTE_HASH_SIZE;
                    115:     entry = palette_find(palette, color, hash);
                    116:     return (entry == NULL ? -1 : entry->idx);
                    117: }
                    118: 
                    119: size_t palette_size(const VncPalette *palette)
                    120: {
                    121:     return palette->size;
                    122: }
                    123: 
                    124: void palette_iter(const VncPalette *palette,
                    125:                   void (*iter)(int idx, uint32_t color, void *opaque),
                    126:                   void *opaque)
                    127: {
                    128:     int i;
                    129:     VncPaletteEntry *entry;
                    130: 
                    131:     for (i = 0; i < VNC_PALETTE_HASH_SIZE; i++) {
                    132:         QLIST_FOREACH(entry, &palette->table[i], next) {
                    133:             iter(entry->idx, entry->color, opaque);
                    134:         }
                    135:     }
                    136: }

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