169 lines
3.6 KiB
C
169 lines
3.6 KiB
C
/**
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* libpsd - Photoshop file formats (*.psd) decode library
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* Copyright (C) 2004-2007 Graphest Software.
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*
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* libpsd is the legal property of its developers, whose names are too numerous
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* to list here. Please refer to the COPYRIGHT file distributed with this
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* source distribution.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library 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 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
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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 Library General Public License
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* 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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* $Id: fixed.c, created by Patrick in 2006.06.22, libpsd@graphest.com Exp $
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*/
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#include "libpsd.h"
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#include "psd_fixed.h"
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psd_fixed_26_6 psd_fixed_26_6_float(psd_float s)
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{
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return (psd_fixed_26_6)(s * 64 + 0.5);
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}
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psd_fixed_26_6 psd_fixed_26_6_int(psd_int i)
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{
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return (psd_fixed_26_6)(i << 6);
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}
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psd_int psd_fixed_26_6_floor(psd_fixed_26_6 f)
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{
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return (f >> 6);
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}
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psd_int psd_fixed_26_6_ceil(psd_fixed_26_6 f)
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{
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return ((f + 63) >> 6);
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}
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psd_int psd_fixed_26_6_round(psd_fixed_26_6 f)
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{
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return ((f + 31) >> 6);
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}
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psd_fixed_16_16 psd_fixed_16_16_float(psd_float s)
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{
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return (psd_fixed_16_16)(s * 65536 + 0.5);
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}
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psd_fixed_16_16 psd_fixed_16_16_int(psd_int i)
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{
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return (psd_fixed_16_16)(i << 16);
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}
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psd_int psd_fixed_16_16_floor(psd_fixed_16_16 f)
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{
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return (f >> 16);
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}
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psd_int psd_fixed_16_16_ceil(psd_fixed_16_16 f)
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{
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return ((f + 65535) >> 16);
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}
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psd_int psd_fixed_16_16_round(psd_fixed_16_16 f)
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{
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return ((f + 32767) >> 16);
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}
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psd_float psd_fixed_16_16_tofloat(psd_fixed_16_16 f)
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{
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return (psd_float)f / 65536.0f;
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}
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psd_fixed_16_16 psd_fixed_16_16_mul(psd_fixed_16_16 first, psd_fixed_16_16 second)
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{
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psd_int sign = 1, ai, bi, af, bf, item, tem;
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if (first < 0)
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{
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first = -first;
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sign = -sign;
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}
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if(second < 0)
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{
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second = -second;
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sign = -sign;
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}
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if(first <= 46340L && second <= 46340L)
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{
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item = first * second >> 16;
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return (sign < 0 ? -item : item);
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}
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af = first & 0xFFFF;
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bf = second & 0xFFFF;
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ai = first >> 16;
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bi = second >> 16;
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item = ai * bi;
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if(item > 32767)
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return (sign < 0 ? -item : item); /* Number is too big */
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tem = af * bf;
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item = (item << 16) + (af * bi) + (ai * bf) + (tem >> 16);
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if(item >= 0x80000000)
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return (sign < 0 ? -item : item); /* Number is too big */
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return (sign < 0 ? -item : item);
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}
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psd_fixed_16_16 psd_fixed_16_16_div(psd_fixed_16_16 first, psd_fixed_16_16 second)
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{
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psd_double first_f, second_f, result;
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if(first == 0 || second == 0)
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return 0;
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if(second == PSD_FIXED_16_16_ONE)
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return first;
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first_f = first / 65536.0;
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second_f = second / 65536.0;
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result = first_f / second_f;
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return (psd_fixed_16_16)(result * 65536.0);
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}
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psd_fixed_8_24 psd_fixed_8_24_float(psd_float s)
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{
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return (psd_fixed_8_24)(s * 0x1000000 + 0.5);
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}
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psd_fixed_8_24 psd_fixed_8_24_int(psd_int i)
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{
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return (psd_fixed_8_24)(i << 24);
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}
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psd_int psd_fixed_8_24_floor(psd_fixed_8_24 f)
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{
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return (f >> 24);
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}
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psd_int psd_fixed_8_24_ceil(psd_fixed_8_24 f)
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{
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return ((f + 255) >> 24);
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}
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psd_int psd_fixed_8_24_round(psd_fixed_8_24 f)
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{
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return ((f + 127) >> 24);
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}
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psd_float psd_fixed_8_24_tofloat(psd_fixed_8_24 f)
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{
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return (psd_float)f / 0x1000000;
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}
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