Add delayed evaluation for image conversions.

kmhofmann · Mar 7, 2019 · f08a326 · f08a326
1 parent 6377d49
commit f08a326
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Showing 6 changed files with 559 additions and 147 deletions.
diff --git a/selene/CMakeLists.txt b/selene/CMakeLists.txt
@@ -271,6 +271,7 @@ target_sources(selene_img_ops PRIVATE
         ${CMAKE_CURRENT_LIST_DIR}/img_ops/View.hpp
         ${CMAKE_CURRENT_LIST_DIR}/img_ops/_impl/FlipExpr.hpp
         ${CMAKE_CURRENT_LIST_DIR}/img_ops/_impl/IdentityExpr.hpp
+        ${CMAKE_CURRENT_LIST_DIR}/img_ops/_impl/ImageConversionExpr.hpp
         ${CMAKE_CURRENT_LIST_DIR}/img_ops/_impl/TransposeExpr.hpp
         )
 

diff --git a/selene/img/pixel/Pixel.hpp b/selene/img/pixel/Pixel.hpp
@@ -971,6 +971,24 @@ round(const Pixel<T, nr_channels_, pixel_format_>& px)
 
 // -----
 
+/** \brief Converts a pixel value into a character stream representation, e.g. for printing.
+ *
+ * @param os An output stream.
+ * @param px The pixel to be converted.
+ * @return A reference to the provided output stream.
+ */
+template <typename T, std::size_t nr_channels_, PixelFormat pixel_format_>
+std::ostream& operator<<(std::ostream& os, const Pixel<T, nr_channels_, pixel_format_>& px)
+{
+  os << '(';
+  for (auto c = std::size_t{0}; c < nr_channels_ - 1; ++c)
+  {
+    os << static_cast<promote_t<T>>(px[c]) << ", ";
+  }
+  os << static_cast<promote_t<T>>(px[nr_channels_ - 1]) << ')';
+  return os;
+}
+
 /** \brief Converts a pixel value into a character stream representation, e.g. for printing.
  *
  * @param os An output stream.