108 lines
3.1 KiB
C++
108 lines
3.1 KiB
C++
/**
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* $Id$
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*
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* ***** BEGIN GPL LICENSE BLOCK *****
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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 General Public License
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* as published by the Free Software Foundation; either version 2
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* 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
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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 program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Contributors: Amorilia (amorilia@gamebox.net)
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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/*
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* This file is based on a similar file from the NVIDIA texture tools
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* (http://nvidia-texture-tools.googlecode.com/)
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*
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* Original license from NVIDIA follows.
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*/
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// Copyright NVIDIA Corporation 2007 -- Ignacio Castano <icastano@nvidia.com>
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without
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// restriction, including without limitation the rights to use,
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// copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following
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// conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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#ifndef _DDS_PIXELFORMAT_H
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#define _DDS_PIXELFORMAT_H
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#include <Common.h>
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namespace PixelFormat
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{
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// Convert component @a c having @a inbits to the returned value having @a outbits.
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inline uint convert(uint c, uint inbits, uint outbits)
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{
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if (inbits == 0)
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{
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return 0;
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}
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else if (inbits >= outbits)
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{
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// truncate
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return c >> (inbits - outbits);
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}
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else
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{
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// bitexpand
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return (c << (outbits - inbits)) | convert(c, inbits, outbits - inbits);
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}
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}
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// Get pixel component shift and size given its mask.
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inline void maskShiftAndSize(uint mask, uint * shift, uint * size)
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{
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if (!mask)
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{
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*shift = 0;
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*size = 0;
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return;
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}
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*shift = 0;
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while((mask & 1) == 0) {
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++(*shift);
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mask >>= 1;
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}
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*size = 0;
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while((mask & 1) == 1) {
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++(*size);
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mask >>= 1;
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}
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}
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} // PixelFormat namespace
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#endif // _DDS_IMAGE_PIXELFORMAT_H
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