diff --git a/PVRTCEncoder/CMakeLists.txt b/PVRTCEncoder/CMakeLists.txt index 31bcfc7..54cad9b 100644 --- a/PVRTCEncoder/CMakeLists.txt +++ b/PVRTCEncoder/CMakeLists.txt @@ -56,10 +56,12 @@ INCLUDE_DIRECTORIES(${FasTC_BINARY_DIR}/PVRTCEncoder/include) SET( HEADERS include/PVRTCCompressor.h + src/Pixel.h ) SET( SOURCES src/Decompressor.cpp + src/Pixel.cpp ) ADD_LIBRARY( PVRTCEncoder diff --git a/PVRTCEncoder/src/Pixel.cpp b/PVRTCEncoder/src/Pixel.cpp new file mode 100644 index 0000000..1f35575 --- /dev/null +++ b/PVRTCEncoder/src/Pixel.cpp @@ -0,0 +1,138 @@ +/* FasTC + * Copyright (c) 2013 University of North Carolina at Chapel Hill. + * All rights reserved. + * + * Permission to use, copy, modify, and distribute this software and its + * documentation for educational, research, and non-profit purposes, without + * fee, and without a written agreement is hereby granted, provided that the + * above copyright notice, this paragraph, and the following four paragraphs + * appear in all copies. + * + * Permission to incorporate this software into commercial products may be + * obtained by contacting the authors or the Office of Technology Development + * at the University of North Carolina at Chapel Hill . + * + * This software program and documentation are copyrighted by the University of + * North Carolina at Chapel Hill. The software program and documentation are + * supplied "as is," without any accompanying services from the University of + * North Carolina at Chapel Hill or the authors. The University of North + * Carolina at Chapel Hill and the authors do not warrant that the operation of + * the program will be uninterrupted or error-free. The end-user understands + * that the program was developed for research purposes and is advised not to + * rely exclusively on the program for any reason. + * + * IN NO EVENT SHALL THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL OR THE + * AUTHORS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, + * OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF + * THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF NORTH CAROLINA + * AT CHAPEL HILL OR THE AUTHORS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH + * DAMAGE. + * + * THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL AND THE AUTHORS SPECIFICALLY + * DISCLAIM ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ANY + * STATUTORY WARRANTY OF NON-INFRINGEMENT. THE SOFTWARE PROVIDED HEREUNDER IS ON + * AN "AS IS" BASIS, AND THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL AND + * THE AUTHORS HAVE NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, + * ENHANCEMENTS, OR MODIFICATIONS. + * + * Please send all BUG REPORTS to . + * + * The authors may be contacted via: + * + * Pavel Krajcevski + * Dept of Computer Science + * 201 S Columbia St + * Frederick P. Brooks, Jr. Computer Science Bldg + * Chapel Hill, NC 27599-3175 + * USA + * + * + */ + +#include "Pixel.h" + +#include +#include + +namespace PVRTCC { + + void Pixel::FromBits(uint8 *bits, uint8 channelDepth[4], uint8 bitOffset) { + memcpy(m_BitDepth, channelDepth, sizeof(m_BitDepth)); + + uint32 nBits = bitOffset; + for(uint32 i = 0; i < 4; i++) { + nBits += channelDepth[i]; + } + + const uint32 nBytes = (nBits >> 3) + ((nBits & 0x7) > 0); + assert(nBytes > 0); + + int32 byteIdx = nBytes - 1; + uint32 bitIdx = bitOffset; + while(bitIdx >= 8) { + bitIdx -= 8; + byteIdx--; + assert(byteIdx >= 0); + } + + for(int32 i = 3; i >= 0; i--) { + uint8 &channel = m_Component[i]; + uint32 depth = channelDepth[i]; + + assert(depth <= 8); + + channel = 0; + if(depth + bitIdx < 8) { + channel = bits[byteIdx] & ((1 << depth) - 1); + bitIdx += depth; + } else { + const uint32 numLowBits = 8 - bitIdx; + uint32 bitsLeft = depth - numLowBits; + channel |= (bits[byteIdx] >> bitIdx) & ((1 << numLowBits) - 1); + byteIdx--; + assert(byteIdx >= 0 || (i == 0 && bitsLeft == 0)); + + uint8 highBits = bits[byteIdx] & ((1 << bitsLeft) - 1); + channel |= highBits << numLowBits; + bitIdx = bitsLeft; + } + } + } + + uint8 Pixel::ChangeBitDepth(uint8 val, uint8 oldDepth, uint8 newDepth) { + assert(newDepth <= 8); + assert(oldDepth <= 8); + + if(oldDepth == newDepth) { + // Do nothing + return val; + } else if(newDepth > oldDepth) { + uint8 bitsLeft = newDepth; + uint8 ret = 0; + while(bitsLeft > oldDepth) { + ret |= val; + ret <<= oldDepth; + bitsLeft -= oldDepth; + } + + return ret | (val >> (oldDepth - bitsLeft)); + + } else { + // oldDepth > newDepth + uint8 bitsWasted = oldDepth - newDepth; + return val >> bitsWasted; + } + + assert(!"We shouldn't get here."); + return 0; + } + + void Pixel::ChangeBitDepth(uint8 (&depth)[4]) { + for(uint32 i = 0; i < 4; i++) { + m_Component[i] = ChangeBitDepth(m_Component[i], m_BitDepth[i], depth[i]); + m_BitDepth[i] = depth[i]; + } + } + +} // namespace PVRTCC diff --git a/PVRTCEncoder/src/Pixel.h b/PVRTCEncoder/src/Pixel.h new file mode 100644 index 0000000..6e6f06c --- /dev/null +++ b/PVRTCEncoder/src/Pixel.h @@ -0,0 +1,106 @@ +/* FasTC + * Copyright (c) 2013 University of North Carolina at Chapel Hill. + * All rights reserved. + * + * Permission to use, copy, modify, and distribute this software and its + * documentation for educational, research, and non-profit purposes, without + * fee, and without a written agreement is hereby granted, provided that the + * above copyright notice, this paragraph, and the following four paragraphs + * appear in all copies. + * + * Permission to incorporate this software into commercial products may be + * obtained by contacting the authors or the Office of Technology Development + * at the University of North Carolina at Chapel Hill . + * + * This software program and documentation are copyrighted by the University of + * North Carolina at Chapel Hill. The software program and documentation are + * supplied "as is," without any accompanying services from the University of + * North Carolina at Chapel Hill or the authors. The University of North + * Carolina at Chapel Hill and the authors do not warrant that the operation of + * the program will be uninterrupted or error-free. The end-user understands + * that the program was developed for research purposes and is advised not to + * rely exclusively on the program for any reason. + * + * IN NO EVENT SHALL THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL OR THE + * AUTHORS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, + * OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF + * THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF NORTH CAROLINA + * AT CHAPEL HILL OR THE AUTHORS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH + * DAMAGE. + * + * THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL AND THE AUTHORS SPECIFICALLY + * DISCLAIM ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ANY + * STATUTORY WARRANTY OF NON-INFRINGEMENT. THE SOFTWARE PROVIDED HEREUNDER IS ON + * AN "AS IS" BASIS, AND THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL AND + * THE AUTHORS HAVE NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, + * ENHANCEMENTS, OR MODIFICATIONS. + * + * Please send all BUG REPORTS to . + * + * The authors may be contacted via: + * + * Pavel Krajcevski + * Dept of Computer Science + * 201 S Columbia St + * Frederick P. Brooks, Jr. Computer Science Bldg + * Chapel Hill, NC 27599-3175 + * USA + * + * + */ + +#ifndef PVRTCENCODER_SRC_PIXEL_H_ +#define PVRTCENCODER_SRC_PIXEL_H_ + +#include "TexCompTypes.h" + +namespace PVRTCC { + +class Pixel { + public: + Pixel(): m_R(0), m_G(0), m_B(0), m_A(0) { } + + explicit Pixel(uint8 *bits, + uint8 channelDepth[4] = static_cast(0), + uint8 bitOffset = 0) { + FromBits(bits, channelDepth); + } + + // Reads a pixel from memory given the bit depth. If NULL then + // it is assumed to be 8 bit RGBA. The bit offset is the offset + // from the least significant bit from which we start reading + // the pixel values. + void FromBits(uint8 *bits, + uint8 channelDepth[4] = static_cast(0), + uint8 bitOffset = 0); + + // Changes the depth of each pixel. This scales the values to + // the appropriate bit depth by either truncating the least + // significant bits when going from larger to smaller bit depth + // or by repeating the most significant bits when going from + // smaller to larger bit depths. + void ChangeBitDepth(uint8 (&newDepth)[4]); + + // Changes the bit depth of a single component. See the comment + // above for how we do this. + static uint8 ChangeBitDepth(uint8 val, uint8 oldDepth, uint8 newDepth); + + private: + union { + struct { + uint8 m_R; + uint8 m_G; + uint8 m_B; + uint8 m_A; + }; + uint8 m_Component[4]; + }; + + // This contains the number of bits that each pixel has. + uint8 m_BitDepth[4]; +}; + +} // namespace PVRTCC + +#endif // PVRTCENCODER_SRC_PIXEL_H_