FasTC/Core/src/Image.cpp
2013-09-13 16:25:00 -04:00

216 lines
7.0 KiB
C++

/* FasTC
* Copyright (c) 2012 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 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 <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 "Image.h"
#include "ImageLoader.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <math.h>
template <typename T>
static inline T sad( const T &a, const T &b ) {
return (a > b)? a - b : b - a;
}
Image::Image(const Image &other)
: m_Width(other.m_Width)
, m_Height(other.m_Height)
, m_bBlockStreamOrder(other.GetBlockStreamOrder())
, m_PixelData(new uint8[m_Width * m_Height * 4])
{
if(m_PixelData) {
memcpy(m_PixelData, other.m_PixelData, m_Width * m_Height * 4);
}
else {
fprintf(stderr, "Out of memory!\n");
}
}
Image::Image(uint32 width, uint32 height, const uint32 *pixels)
: m_Width(width)
, m_Height(height)
, m_bBlockStreamOrder(false)
, m_PixelData(new uint8[4 * m_Width * m_Height])
{
if(m_PixelData && pixels)
memcpy(m_PixelData, pixels, m_Width * m_Height * sizeof(uint32));
}
Image &Image::operator=(const Image &other) {
m_Width = other.m_Width;
m_Height = other.m_Height;
m_bBlockStreamOrder = other.GetBlockStreamOrder();
if(m_PixelData) {
delete [] m_PixelData;
}
if(other.m_PixelData) {
m_PixelData = new uint8[m_Width * m_Height * 4];
if(m_PixelData)
memcpy(m_PixelData, other.m_PixelData, m_Width * m_Height * 4);
else
fprintf(stderr, "Out of memory!\n");
}
else {
m_PixelData = other.m_PixelData;
}
return *this;
}
Image::Image(const CompressedImage &ci)
: m_Width(ci.GetWidth())
, m_Height(ci.GetHeight())
, m_bBlockStreamOrder(true)
{
unsigned int bufSz = ci.GetWidth() * ci.GetHeight() * 4;
m_PixelData = new uint8[ bufSz ];
if(!m_PixelData) { fprintf(stderr, "%s\n", "Out of memory!"); return; }
if(!ci.DecompressImage(m_PixelData, bufSz)) {
fprintf(stderr, "Error decompressing image!\n");
return;
}
}
Image::Image(const ImageLoader &loader)
: m_Width(loader.GetWidth())
, m_Height(loader.GetHeight())
, m_bBlockStreamOrder(true)
, m_PixelData(0)
{
if(loader.GetImageData()) {
m_PixelData = new uint8[ loader.GetImageDataSz() ];
if(!m_PixelData) { fprintf(stderr, "%s\n", "Out of memory!"); return; }
memcpy(m_PixelData, loader.GetImageData(), loader.GetImageDataSz());
}
else {
fprintf(stderr, "%s\n", "Failed to get data from image loader!");
}
}
Image::~Image() {
if(m_PixelData) {
delete [] m_PixelData;
m_PixelData = 0;
}
}
CompressedImage *Image::Compress(const SCompressionSettings &settings) const {
CompressedImage *outImg = NULL;
const unsigned int dataSz = GetWidth() * GetHeight() * 4;
assert(dataSz > 0);
// Allocate data based on the compression method
int cmpDataSz = 0;
switch(settings.format) {
default: assert(!"Not implemented!"); // Fall Through V
case eCompressionFormat_DXT1: cmpDataSz = dataSz / 8; break;
case eCompressionFormat_DXT5: cmpDataSz = dataSz / 4; break;
case eCompressionFormat_BPTC: cmpDataSz = dataSz / 4; break;
}
unsigned char *cmpData = new unsigned char[cmpDataSz];
CompressImageData(m_PixelData, dataSz, cmpData, cmpDataSz, settings);
outImg = new CompressedImage(GetWidth(), GetHeight(), settings.format, cmpData);
delete [] cmpData;
return outImg;
}
double Image::ComputePSNR(const CompressedImage &ci) const {
unsigned int imageSz = 4 * GetWidth() * GetHeight();
unsigned char *unCompData = new unsigned char[imageSz];
if(!(ci.DecompressImage(unCompData, imageSz))) {
fprintf(stderr, "%s\n", "Failed to decompress image.");
delete [] unCompData;
return -1.0f;
}
const double wr = 1.0;
const double wg = 1.0;
const double wb = 1.0;
double MSE = 0.0;
for(uint32 i = 0; i < imageSz; i+=4) {
const unsigned char *pixelDataRaw = m_PixelData + i;
const unsigned char *pixelDataUncomp = unCompData + i;
double rawAlphaScale = double(pixelDataRaw[3]) / 255.0;
double uncompAlphaScale = double(pixelDataUncomp[3]) / 255.0;
double dr = double(sad(rawAlphaScale * pixelDataRaw[0], uncompAlphaScale * pixelDataUncomp[0])) * wr;
double dg = double(sad(rawAlphaScale * pixelDataRaw[1], uncompAlphaScale * pixelDataUncomp[1])) * wg;
double db = double(sad(rawAlphaScale * pixelDataRaw[2], uncompAlphaScale * pixelDataUncomp[2])) * wb;
const double pixelMSE =
(double(dr) * double(dr)) +
(double(dg) * double(dg)) +
(double(db) * double(db));
//fprintf(stderr, "Pixel MSE: %f\n", pixelMSE);
MSE += pixelMSE;
}
MSE /= (double(GetWidth()) * double(GetHeight()));
double MAXI =
(255.0 * wr) * (255.0 * wr) +
(255.0 * wg) * (255.0 * wg) +
(255.0 * wb) * (255.0 * wb);
double PSNR = 10 * log10(MAXI/MSE);
// Cleanup
delete unCompData;
return PSNR;
}