orthanc: OrthancFramework/Sources/Images/ImageProcessing.cpp comparison

optimization in ImageProcessing::ShiftScale()

author	Sebastien Jodogne <s.jodogne@gmail.com>
date	Mon, 30 Aug 2021 12:13:05 +0200
parents	f9eda86f9045
children	7053502fbf97

comparison

equal deleted inserted replaced

-:4f368230f32b
+:ebb801d44e06
 throw OrthancException(ErrorCode_NotImplemented);
 }
 }
+static bool IsIdentityRescaling(float offset,
+float scaling)
+{
+return (std::abs(offset) <= 10.0f * std::numeric_limits<float>::epsilon() &&
+std::abs(scaling - 1.0f) <= 10.0f * std::numeric_limits<float>::epsilon());
+}
 void ImageProcessing::ShiftScale2(ImageAccessor& image,
 float offset,
 float scaling,
 bool useRound)
 {
 // We compute "a * x + b"
 const float a = scaling;
 const float b = offset;
+if (IsIdentityRescaling(offset, scaling))
+{
+return;
+}
 switch (image.GetFormat())
 {
 case PixelFormat_Grayscale8:
 if (useRound)
 bool useRound)
 {
 // We compute "a * x + b"
 const float a = scaling;
 const float b = offset;
+if (target.GetFormat() == source.GetFormat() &&
+IsIdentityRescaling(offset, scaling))
+{
+Copy(target, source);
+return;
+}
 switch (target.GetFormat())
 {
 case PixelFormat_Grayscale8:

Mercurial > hg > orthanc