Mercurial > hg > orthanc-stone
diff Framework/Scene2D/Internals/CairoFloatTextureRenderer.cpp @ 1179:177e7d431cd1 broker
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 |
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--- a/Framework/Scene2D/Internals/CairoFloatTextureRenderer.cpp Wed Nov 20 14:12:11 2019 +0100 +++ b/Framework/Scene2D/Internals/CairoFloatTextureRenderer.cpp Wed Nov 20 15:24:20 2019 +0100 @@ -53,6 +53,8 @@ target.GetFormat() == Orthanc::PixelFormat_BGRA32 && sizeof(float) == 4); + static const float LOG_NORMALIZATION = 255.0f / log(1.0f + 255.0f); + for (unsigned int y = 0; y < height; y++) { const float* p = reinterpret_cast<const float*>(source.GetConstRow(y)); @@ -70,6 +72,14 @@ v = 255; } + if (l.IsApplyLog()) + { + // https://theailearner.com/2019/01/01/log-transformation/ + v = LOG_NORMALIZATION * log(1.0f + static_cast<float>(v)); + } + + assert(v >= 0.0f && v <= 255.0f); + uint8_t vv = static_cast<uint8_t>(v); if (l.IsInverted())