As I understand it all SMPTE subtitles are MXF-wrapped.

[libdcp.git] / test / colour_conversion_test.cc

diff --git a/test/colour_conversion_test.cc b/test/colour_conversion_test.cc
index 7193a5efb46db5e4b13a66260d15a90d56f4f0a2..7ff93468b5c6b72ee9536250b8165d3fa767cae9 100644 (file)
--- a/test/colour_conversion_test.cc
+++ b/test/colour_conversion_test.cc
@@ -28,9 +28,9 @@ using boost::shared_ptr;
 using namespace dcp;
 
 static void
-check_gamma (shared_ptr<const TransferFunction> tf, int bit_depth, float gamma)
+check_gamma (shared_ptr<const TransferFunction> tf, int bit_depth, bool inverse, float gamma)
 {
-       double const * lut = tf->lut (bit_depth);
+       double const * lut = tf->lut (bit_depth, inverse);
        int const count = rint (pow (2.0, bit_depth));
 
        for (int i = 0; i < count; ++i) {
@@ -39,9 +39,9 @@ check_gamma (shared_ptr<const TransferFunction> tf, int bit_depth, float gamma)
 }
 
 static void
-check_modified_gamma (shared_ptr<const TransferFunction> tf, int bit_depth, double power, double threshold, double A, double B)
+check_modified_gamma (shared_ptr<const TransferFunction> tf, int bit_depth, bool inverse, double power, double threshold, double A, double B)
 {
-       double const * lut = tf->lut (bit_depth);
+       double const * lut = tf->lut (bit_depth, inverse);
        int const count = rint (pow (2.0, bit_depth));
 
        for (int i = 0; i < count; ++i) {
@@ -54,29 +54,31 @@ check_modified_gamma (shared_ptr<const TransferFunction> tf, int bit_depth, doub
        }
 }
 
+/** Check that the gamma correction LUTs are right for sRGB */
 BOOST_AUTO_TEST_CASE (colour_conversion_test1)
 {
        ColourConversion cc = ColourConversion::srgb_to_xyz ();
 
-       check_modified_gamma (cc.in(), 8, 2.4, 0.04045, 0.055, 12.92);
-       check_modified_gamma (cc.in(), 12, 2.4, 0.04045, 0.055, 12.92);
-       check_modified_gamma (cc.in(), 16, 2.4, 0.04045, 0.055, 12.92);
+       check_modified_gamma (cc.in(), 8, false, 2.4, 0.04045, 0.055, 12.92);
+       check_modified_gamma (cc.in(), 12, false, 2.4, 0.04045, 0.055, 12.92);
+       check_modified_gamma (cc.in(), 16, false, 2.4, 0.04045, 0.055, 12.92);
 
-       check_gamma (cc.out(), 8, 1 / 2.6);
-       check_gamma (cc.out(), 12, 1 / 2.6);
-       check_gamma (cc.out(), 16, 1 / 2.6);
+       check_gamma (cc.out(), 8, true, 1 / 2.6);
+       check_gamma (cc.out(), 12, true, 1 / 2.6);
+       check_gamma (cc.out(), 16, true, 1 / 2.6);
 }
 
+/** Check that the gamma correction LUTs are right for REC709 */
 BOOST_AUTO_TEST_CASE (colour_conversion_test2)
 {
        ColourConversion cc = ColourConversion::rec709_to_xyz ();
 
-       check_modified_gamma (cc.in(), 8, 2.4, 0.081, 0.099, 4.5);
-       check_modified_gamma (cc.in(), 12, 2.4, 0.081, 0.099, 4.5);
-       check_modified_gamma (cc.in(), 16, 2.4, 0.081, 0.099, 4.5);
+       check_modified_gamma (cc.in(), 8, false, 1 / 0.45, 0.081, 0.099, 4.5);
+       check_modified_gamma (cc.in(), 12, false, 1 / 0.45, 0.081, 0.099, 4.5);
+       check_modified_gamma (cc.in(), 16, false, 1 / 0.45, 0.081, 0.099, 4.5);
 
-       check_gamma (cc.out(), 8, 1 / 2.6);
-       check_gamma (cc.out(), 12, 1 / 2.6);
-       check_gamma (cc.out(), 16, 1 / 2.6);
+       check_gamma (cc.out(), 8, true, 1 / 2.6);
+       check_gamma (cc.out(), 12, true, 1 / 2.6);
+       check_gamma (cc.out(), 16, true, 1 / 2.6);
 }