1 files changed, 133 insertions, 0 deletions
diff --git a/source/blender/blenlib/tests/BLI_color_test.cc b/source/blender/blenlib/tests/BLI_color_test.cc
new file mode 100644
index 00000000000..14796e6bf71
--- /dev/null
+++ b/source/blender/blenlib/tests/BLI_color_test.cc
@@ -0,0 +1,133 @@
+/* Apache License, Version 2.0 */
+
+#include "testing/testing.h"
+
+#include "BLI_color.hh"
+
+namespace blender::tests {
+
+/**
+ * \name Conversions
+ * \{ */
+
+TEST(color, ThemeByteToFloat)
+{
+  ColorTheme4b theme_byte(192, 128, 64, 128);
+  ColorTheme4f theme_float = theme_byte.to_4f();
+  EXPECT_NEAR(0.75f, theme_float.r, 0.01f);
+  EXPECT_NEAR(0.5f, theme_float.g, 0.01f);
+  EXPECT_NEAR(0.25f, theme_float.b, 0.01f);
+  EXPECT_NEAR(0.5f, theme_float.a, 0.01f);
+}
+
+TEST(color, SrgbStraightFloatToByte)
+{
+  ColorTheme4f theme_float(0.75f, 0.5f, 0.25f, 0.5f);
+  ColorTheme4b theme_byte = theme_float.to_4b();
+  EXPECT_EQ(191, theme_byte.r);
+  EXPECT_EQ(128, theme_byte.g);
+  EXPECT_EQ(64, theme_byte.b);
+  EXPECT_EQ(128, theme_byte.a);
+}
+
+TEST(color, SrgbStraightToSceneLinearPremultiplied)
+{
+  BLI_init_srgb_conversion();
+
+  ColorTheme4b theme(192, 128, 64, 128);
+  ColorSceneLinear4f<eAlpha::Premultiplied> linear =
+      BLI_color_convert_to_scene_linear(theme).premultiply_alpha();
+  EXPECT_NEAR(0.26f, linear.r, 0.01f);
+  EXPECT_NEAR(0.11f, linear.g, 0.01f);
+  EXPECT_NEAR(0.02f, linear.b, 0.01f);
+  EXPECT_NEAR(0.5f, linear.a, 0.01f);
+}
+
+TEST(color, SceneLinearStraightToPremultiplied)
+{
+  ColorSceneLinear4f<eAlpha::Straight> straight(0.75f, 0.5f, 0.25f, 0.5f);
+  ColorSceneLinear4f<eAlpha::Premultiplied> premultiplied = straight.premultiply_alpha();
+  EXPECT_NEAR(0.37f, premultiplied.r, 0.01f);
+  EXPECT_NEAR(0.25f, premultiplied.g, 0.01f);
+  EXPECT_NEAR(0.12f, premultiplied.b, 0.01f);
+  EXPECT_NEAR(0.5f, premultiplied.a, 0.01f);
+}
+
+TEST(color, SceneLinearPremultipliedToStraight)
+{
+  ColorSceneLinear4f<eAlpha::Premultiplied> premultiplied(0.75f, 0.5f, 0.25f, 0.5f);
+  ColorSceneLinear4f<eAlpha::Straight> straight = premultiplied.unpremultiply_alpha();
+  EXPECT_NEAR(1.5f, straight.r, 0.01f);
+  EXPECT_NEAR(1.0f, straight.g, 0.01f);
+  EXPECT_NEAR(0.5f, straight.b, 0.01f);
+  EXPECT_NEAR(0.5f, straight.a, 0.01f);
+}
+
+TEST(color, SceneLinearStraightSrgbFloat)
+{
+  BLI_init_srgb_conversion();
+  ColorSceneLinear4f<eAlpha::Straight> linear(0.75f, 0.5f, 0.25f, 0.5f);
+  ColorTheme4f theme = BLI_color_convert_to_theme4f(linear);
+  EXPECT_NEAR(0.88f, theme.r, 0.01);
+  EXPECT_NEAR(0.73f, theme.g, 0.01);
+  EXPECT_NEAR(0.53f, theme.b, 0.01);
+  EXPECT_NEAR(0.5f, theme.a, 0.01);
+}
+
+TEST(color, SceneLinearPremultipliedToSrgbFloat)
+{
+  BLI_init_srgb_conversion();
+  ColorSceneLinear4f<eAlpha::Premultiplied> linear(0.75f, 0.5f, 0.25f, 0.5f);
+  ColorTheme4f theme = BLI_color_convert_to_theme4f(linear.unpremultiply_alpha());
+
+  EXPECT_NEAR(1.19f, theme.r, 0.01);
+  EXPECT_NEAR(1.0f, theme.g, 0.01);
+  EXPECT_NEAR(0.74f, theme.b, 0.01);
+  EXPECT_NEAR(0.5f, theme.a, 0.01);
+}
+
+TEST(color, SceneLinearStraightSrgbByte)
+{
+  BLI_init_srgb_conversion();
+  ColorSceneLinear4f<eAlpha::Straight> linear(0.75f, 0.5f, 0.25f, 0.5f);
+  ColorTheme4b theme = BLI_color_convert_to_theme4b(linear);
+  EXPECT_EQ(225, theme.r);
+  EXPECT_EQ(188, theme.g);
+  EXPECT_EQ(137, theme.b);
+  EXPECT_EQ(128, theme.a);
+}
+
+TEST(color, SceneLinearPremultipliedToSrgbByte)
+{
+  BLI_init_srgb_conversion();
+  ColorSceneLinear4f<eAlpha::Premultiplied> linear(0.75f, 0.5f, 0.25f, 0.5f);
+  ColorTheme4b theme = BLI_color_convert_to_theme4b(linear.unpremultiply_alpha());
+  EXPECT_EQ(255, theme.r);
+  EXPECT_EQ(255, theme.g);
+  EXPECT_EQ(188, theme.b);
+  EXPECT_EQ(128, theme.a);
+}
+
+TEST(color, SceneLinearByteEncoding)
+{
+  ColorSceneLinear4f<eAlpha::Premultiplied> linear(0.75f, 0.5f, 0.25f, 0.5f);
+  ColorSceneLinearByteEncoded4b<eAlpha::Premultiplied> encoded = linear.encode();
+  EXPECT_EQ(225, encoded.r);
+  EXPECT_EQ(188, encoded.g);
+  EXPECT_EQ(137, encoded.b);
+  EXPECT_EQ(128, encoded.a);
+}
+
+TEST(color, SceneLinearByteDecoding)
+{
+  ColorSceneLinearByteEncoded4b<eAlpha::Premultiplied> encoded(225, 188, 137, 128);
+  ColorSceneLinear4f<eAlpha::Premultiplied> decoded = encoded.decode();
+  EXPECT_NEAR(0.75f, decoded.r, 0.01f);
+  EXPECT_NEAR(0.5f, decoded.g, 0.01f);
+  EXPECT_NEAR(0.25f, decoded.b, 0.01f);
+  EXPECT_NEAR(0.5f, decoded.a, 0.01f);
+}
+
+/* \} */
+
+}  // namespace blender::tests