FasTC/PVRTCEncoder/test/DecompressorTest.cpp

/* 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 <otd@unc.edu>.
 *
 * 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
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 * DISCLAIM ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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 * Please send all BUG REPORTS to <pavel@cs.unc.edu>.
 *
 * 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
 * 
 * <http://gamma.cs.unc.edu/FasTC/>
 */

#include "gtest/gtest.h"

#include "TestUtils.h"

#include "PVRTCCompressor.h"

static const FasTC::ECompressionFormat kFmt = FasTC::eCompressionFormat_PVRTC4;

TEST(Decompressor, DecompressWhite) {
  const uint32 kWidth = 32;
  const uint32 kHeight = 32;

  uint8 pvrData[512];

  for(int i = 0; i < 512; i += 8) {
    uint8 whiteBlock[8] = { 0xAA, 0xAA, 0xAA, 0xAA, 0xFE, 0xFF, 0xFF, 0xFF };
    memcpy(pvrData + i, whiteBlock, 8);
  }

  uint8 outData[4 * kWidth * kHeight];

  FasTC::DecompressionJob dcj (kFmt, pvrData, outData, kWidth, kHeight);
  PVRTCC::Decompress(dcj);

  for(uint32 i = 0; i < kWidth; i++) {
    for(uint32 j = 0; j < kHeight; j++) {
      const uint32 *pixelData = reinterpret_cast<const uint32 *>(outData);
      const uint32 p = pixelData[j*kWidth + i];
      EXPECT_EQ(PixelPrinter(p), PixelPrinter(0xFFFFFFFF));
    }
  }
}

TEST(Decompressor, DecompressGray) {
  const uint32 kWidth = 32;
  const uint32 kHeight = 32;

  uint8 pvrData[512];

  for(uint32 i = 0; i < 512; i += 8) {
    uint8 grayBlock[8] = { 0xAA, 0xAA, 0xAA, 0xAA, 0xF0, 0xBD, 0x0F, 0xC2 };
    memcpy(pvrData + i, grayBlock, 8);
  }

  uint8 outData[4 * kWidth * kHeight];

  FasTC::DecompressionJob dcj (kFmt, pvrData, outData, kWidth, kHeight);
  PVRTCC::Decompress(dcj);

  for(uint32 i = 0; i < kWidth; i++) {
    for(uint32 j = 0; j < kHeight; j++) {
      const uint32 *pixelData = reinterpret_cast<const uint32 *>(outData);
      const uint32 p = pixelData[j*kWidth + i];
      EXPECT_EQ(PixelPrinter(p), PixelPrinter(0xFF818080));
    }
  }
}