mirror of
https://github.com/yuzu-emu/FasTC.git
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127 lines
4 KiB
C++
127 lines
4 KiB
C++
/* FasTC
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* Copyright (c) 2013 University of North Carolina at Chapel Hill.
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* All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software and its
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* documentation for educational, research, and non-profit purposes, without
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* fee, and without a written agreement is hereby granted, provided that the
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* above copyright notice, this paragraph, and the following four paragraphs
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* appear in all copies.
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*
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* Permission to incorporate this software into commercial products may be
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* obtained by contacting the authors or the Office of Technology Development
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* at the University of North Carolina at Chapel Hill <otd@unc.edu>.
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*
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* This software program and documentation are copyrighted by the University of
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* North Carolina at Chapel Hill. The software program and documentation are
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* supplied "as is," without any accompanying services from the University of
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* North Carolina at Chapel Hill or the authors. The University of North
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* Carolina at Chapel Hill and the authors do not warrant that the operation of
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* the program will be uninterrupted or error-free. The end-user understands
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* that the program was developed for research purposes and is advised not to
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* rely exclusively on the program for any reason.
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*
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* IN NO EVENT SHALL THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL OR THE
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* AUTHORS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL,
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* OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF
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* THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF NORTH CAROLINA
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* AT CHAPEL HILL OR THE AUTHORS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL AND THE AUTHORS SPECIFICALLY
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* DISCLAIM ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ANY
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* STATUTORY WARRANTY OF NON-INFRINGEMENT. THE SOFTWARE PROVIDED HEREUNDER IS ON
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* AN "AS IS" BASIS, AND THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL AND
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* THE AUTHORS HAVE NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
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* ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Please send all BUG REPORTS to <pavel@cs.unc.edu>.
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*
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* The authors may be contacted via:
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*
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* Pavel Krajcevski
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* Dept of Computer Science
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* 201 S Columbia St
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* Frederick P. Brooks, Jr. Computer Science Bldg
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* Chapel Hill, NC 27599-3175
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* USA
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*
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* <http://gamma.cs.unc.edu/FasTC/>
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*/
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#ifndef PVRTCENCODER_SRC_INDEXER_H_
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#define PVRTCENCODER_SRC_INDEXER_H_
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#include "FasTC/PVRTCCompressor.h"
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#include <algorithm>
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#include <cassert>
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namespace PVRTCC {
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class Indexer {
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private:
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const EWrapMode m_WrapMode;
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const uint32 m_Width;
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const uint32 m_Height;
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uint32 Resolve(int32 i, uint32 limit) const {
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int32 l = static_cast<int32>(limit);
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// Assumptions
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assert(i > -l);
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assert(i < 2*l);
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int32 r = -1;
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switch(m_WrapMode) {
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case eWrapMode_Clamp:
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r = static_cast<uint32>(std::max(0, std::min(i, l-1)));
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break;
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case eWrapMode_Wrap:
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{
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r = i;
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if ((l & (l-1)) == 0) {
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r = (r + l) & (l - 1);
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} else {
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if (r >= l) { r -= l; }
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if (r < 0) { r += l; }
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}
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}
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break;
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}
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assert (r >= 0);
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assert (r < static_cast<int32>(limit));
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return r;
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}
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public:
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Indexer(uint32 width, uint32 height, EWrapMode wrapMode = eWrapMode_Wrap)
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: m_WrapMode(wrapMode)
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, m_Width(width)
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, m_Height(height)
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{ }
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uint32 GetWidth() const { return this->m_Width; }
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uint32 GetHeight() const { return this->m_Height; }
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EWrapMode GetWrapMode() const { return this->m_WrapMode; }
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uint32 ResolveX(int32 i) const { return Resolve(i, this->m_Width); }
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uint32 ResolveY(int32 i) const { return Resolve(i, this->m_Height); }
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uint32 operator()(int32 i, int32 j) const {
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uint32 _i = this->ResolveX(i);
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uint32 _j = this->ResolveY(j);
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uint32 index = _j * this->m_Width + _i;
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assert (index < this->m_Width * this->m_Height);
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return index;
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}
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};
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} // namespace PVRTCC
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#endif // PVRTCENCODER_SRC_INDEXER_H_
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