Mercurial > hg > orthanc-stone

comparison Framework/Scene2D/Internals/CairoFloatTextureRenderer.cpp @ 1179:177e7d431cd1 broker

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log scale in textures, remove redundant code for LUTs
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 20 Nov 2019 15:24:20 +0100
parents 6e79e8c9021c
children 0ca50d275b9a
comparison
equal deleted inserted replaced
1178:3c7cdbf32e2a 1179:177e7d431cd1
51 51
52 assert(source.GetFormat() == Orthanc::PixelFormat_Float32 && 52 assert(source.GetFormat() == Orthanc::PixelFormat_Float32 &&
53 target.GetFormat() == Orthanc::PixelFormat_BGRA32 && 53 target.GetFormat() == Orthanc::PixelFormat_BGRA32 &&
54 sizeof(float) == 4); 54 sizeof(float) == 4);
55 55
56 static const float LOG_NORMALIZATION = 255.0f / log(1.0f + 255.0f);
57
56 for (unsigned int y = 0; y < height; y++) 58 for (unsigned int y = 0; y < height; y++)
57 { 59 {
58 const float* p = reinterpret_cast<const float*>(source.GetConstRow(y)); 60 const float* p = reinterpret_cast<const float*>(source.GetConstRow(y));
59 uint8_t* q = reinterpret_cast<uint8_t*>(target.GetRow(y)); 61 uint8_t* q = reinterpret_cast<uint8_t*>(target.GetRow(y));
60 62
67 } 69 }
68 else if (v >= 255) 70 else if (v >= 255)
69 { 71 {
70 v = 255; 72 v = 255;
71 } 73 }
74
75 if (l.IsApplyLog())
76 {
77 // https://theailearner.com/2019/01/01/log-transformation/
78 v = LOG_NORMALIZATION * log(1.0f + static_cast<float>(v));
79 }
80
81 assert(v >= 0.0f && v <= 255.0f);
72 82
73 uint8_t vv = static_cast<uint8_t>(v); 83 uint8_t vv = static_cast<uint8_t>(v);
74 84
75 if (l.IsInverted()) 85 if (l.IsInverted())
76 { 86 {