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63 lines
1.8 KiB
63 lines
1.8 KiB
/*
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* Copyright (C) 2002 RealVNC Ltd. All Rights Reserved.
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* Copyright (C) 2003 Sun Microsystems, Inc.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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#include "zrlepalettehelper.h"
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#include <assert.h>
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#include <string.h>
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#define ZRLE_HASH(pix) (((pix) ^ ((pix) >> 17)) & 4095)
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void zrlePaletteHelperInit(zrlePaletteHelper *helper)
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{
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memset(helper->palette, 0, sizeof(helper->palette));
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memset(helper->index, 255, sizeof(helper->index));
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memset(helper->key, 0, sizeof(helper->key));
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helper->size = 0;
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}
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void zrlePaletteHelperInsert(zrlePaletteHelper *helper, zrle_U32 pix)
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{
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if (helper->size < ZRLE_PALETTE_MAX_SIZE) {
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int i = ZRLE_HASH(pix);
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while (helper->index[i] != 255 && helper->key[i] != pix)
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i++;
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if (helper->index[i] != 255) return;
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helper->index[i] = helper->size;
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helper->key[i] = pix;
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helper->palette[helper->size] = pix;
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}
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helper->size++;
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}
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int zrlePaletteHelperLookup(zrlePaletteHelper *helper, zrle_U32 pix)
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{
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int i = ZRLE_HASH(pix);
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assert(helper->size <= ZRLE_PALETTE_MAX_SIZE);
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while (helper->index[i] != 255 && helper->key[i] != pix)
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i++;
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if (helper->index[i] != 255) return helper->index[i];
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return -1;
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}
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