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