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// Copyright 2009-2021 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
#include "image.h"
#include "../../../common/sys/estring.h"
#include <map>
#include <iostream>
namespace embree
{
double compareImages(Ref<Image> image0, Ref<Image> image1)
{
/* compare image size */
const size_t width = image0->width;
const size_t height = image0->height;
if (image1->width != width) return inf;
if (image1->height != height) return inf;
/* compare both images */
double diff = 0.0;
for (size_t y=0; y<height; y++)
{
for (size_t x=0; x<width; x++)
{
const Color c0 = image0->get(x,y);
const Color c1 = image1->get(x,y);
diff += sqr(fabs(c0.r - c1.r))/3.0f;
diff += sqr(fabs(c0.g - c1.g))/3.0f;
diff += sqr(fabs(c0.b - c1.b))/3.0f;
}
}
return diff;
}
/*! loads an image from a file with auto-detection of format */
Ref<Image> loadImageFromDisk(const FileName& fileName)
{
std::string ext = toLowerCase(fileName.ext());
if (ext == "bmp" ) return loadSTB(fileName);
if (ext == "png" ) return loadSTB(fileName);
if (ext == "jpg" ) return loadSTB(fileName);
if (ext == "exr" ) return loadEXR(fileName);
if (ext == "pfm" ) return loadPFM(fileName);
if (ext == "ppm" ) return loadPPM(fileName);
if (ext == "tga" ) return loadTGA(fileName);
THROW_RUNTIME_ERROR("image format " + ext + " not supported");
}
static std::map<std::string,Ref<Image> > image_cache;
/*! loads an image from a file with auto-detection of format */
Ref<Image> loadImage(const FileName& fileName, bool cache)
{
if (!cache)
return loadImageFromDisk(fileName);
if (image_cache.find(fileName) == image_cache.end())
image_cache[fileName] = loadImageFromDisk(fileName);
return image_cache[fileName];
}
/*! stores an image to file with auto-detection of format */
void storeImage(const Ref<Image>& img, const FileName& fileName)
{
std::string ext = toLowerCase(fileName.ext());
if (ext == "bmp" ) { storeSTB(img, fileName); return; }
if (ext == "png" ) { storeSTB(img, fileName); return; }
if (ext == "jpg" ) { storeSTB(img, fileName); return; }
if (ext == "exr" ) { storeEXR(img, fileName); return; }
if (ext == "pfm" ) { storePFM(img, fileName); return; }
if (ext == "ppm" ) { storePPM(img, fileName); return; }
if (ext == "tga" ) { storeTga(img, fileName); return; }
THROW_RUNTIME_ERROR("image format " + ext + " not supported");
}
/*! template instantiations */
template class ImageT<Col3uc>;
template class ImageT<Col3f>;
}
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