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38 lines
1.3 KiB
C++
38 lines
1.3 KiB
C++
/*
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* Copyright (C) 2010 Cameron Zemek ( grom@zeminvaders.net)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This program 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdint.h>
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#include "hqx.h"
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uint32_t RGBtoYUV[16777216];
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uint32_t YUV1, YUV2;
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HQX_API void HQX_CALLCONV hqxInit(void)
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{
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/* Initalize RGB to YUV lookup table */
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uint32_t c, r, g, b, y, u, v;
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for (c = 0; c < 16777215; c++) {
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r = (c & 0xFF0000) >> 16;
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g = (c & 0x00FF00) >> 8;
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b = c & 0x0000FF;
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y = (uint32_t)(0.299*r + 0.587*g + 0.114*b);
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u = (uint32_t)(-0.169*r - 0.331*g + 0.5*b) + 128;
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v = (uint32_t)(0.5*r - 0.419*g - 0.081*b) + 128;
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RGBtoYUV[c] = (y << 16) + (u << 8) + v;
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}
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}
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