Built-In Transform support for Apple Log

src/OpenColorIO/CMakeLists.txt

@@ -150,6 +150,7 @@ set(SOURCES
     transforms/builtins/BuiltinTransformRegistry.cpp
     transforms/builtins/ColorMatrixHelpers.cpp
     transforms/builtins/OpHelpers.cpp
+    transforms/builtins/AppleCameras.cpp
     transforms/builtins/ArriCameras.cpp
     transforms/builtins/CanonCameras.cpp
     transforms/builtins/Displays.cpp

src/OpenColorIO/Config.cpp

@@ -247,7 +247,7 @@ static constexpr unsigned LastSupportedMajorVersion = OCIO_VERSION_MAJOR;
 
 // For each major version keep the most recent minor.
 static const unsigned int LastSupportedMinorVersion[] = {0, // Version 1
-                                                         3  // Version 2
+                                                         4  // Version 2
                                                          };
 
 } // namespace
@@ -5231,6 +5231,16 @@ void Config::Impl::checkVersionConsistency(ConstTransformRcPtr & transform) cons
                 throw Exception("Only config version 2.3 (or higher) can have "
                                 "BuiltinTransform style 'DISPLAY - CIE-XYZ-D65_to_DisplayP3'.");
             }
+            if (m_majorVersion == 2 && m_minorVersion < 4 
+                    && (   0 == Platform::Strcasecmp(blt->getStyle(), "APPLE_LOG_to_ACES2065-1")
+                        || 0 == Platform::Strcasecmp(blt->getStyle(), "CURVE - APPLE_LOG_to_LINEAR") )
+                )
+            {
+                std::ostringstream os;
+                os << "Only config version 2.4 (or higher) can have BuiltinTransform style '"
+                   << blt->getStyle() << "'.";
+                throw Exception(os.str().c_str());
+            }
         }
         else if (ConstCDLTransformRcPtr cdl = DynamicPtrCast<const CDLTransform>(transform))
         {

src/OpenColorIO/transforms/builtins/AppleCameras.cpp

@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright Contributors to the OpenColorIO Project.
+
+
+#include <cmath>
+
+#include <OpenColorIO/OpenColorIO.h>
+
+#include "ops/matrix/MatrixOp.h"
+#include "transforms/builtins/AppleCameras.h"
+#include "transforms/builtins/BuiltinTransformRegistry.h"
+#include "transforms/builtins/ColorMatrixHelpers.h"
+#include "transforms/builtins/OpHelpers.h"
+
+
+namespace OCIO_NAMESPACE
+{
+
+namespace APPLE_LOG
+{
+
+void GenerateAppleLogToLinearOps(OpRcPtrVec & ops)
+{
+    auto GenerateLutValues = [](double in) -> float
+    {
+        constexpr double R_0   = -0.05641088;
+        constexpr double R_t   = 0.01;
+        constexpr double c     = 47.28711236;
+        constexpr double beta  = 0.00964052;
+        constexpr double gamma = 0.08550479;
+        constexpr double delta = 0.69336945;
+        const double P_t       = c * std::pow((R_t - R_0), 2.0);
+
+        if (in >= P_t)
+        {
+            return float(std::pow(2.0, (in - delta) / gamma) - beta);
+        }
+        else if (in < P_t && in >= 0.0)
+        {
+            return float(std::sqrt(in / c) + R_0);
+        }
+        else
+        {
+            return float(R_0);
+        }
+    };
+
+    CreateHalfLut(ops, GenerateLutValues);
+
+}
+
+} // namespace APPLE_LOG
+
+namespace CAMERA
+{
+
+namespace APPLE
+{
+
+void RegisterAll(BuiltinTransformRegistryImpl & registry) noexcept
+{
+    {
+        auto APPLE_LOG_to_ACES2065_1_Functor = [](OpRcPtrVec & ops)
+        {
+            APPLE_LOG::GenerateAppleLogToLinearOps(ops);
+
+            MatrixOpData::MatrixArrayPtr matrix
+            = build_conversion_matrix(REC2020::primaries, ACES_AP0::primaries, ADAPTATION_BRADFORD);
+            CreateMatrixOp(ops, matrix, TRANSFORM_DIR_FORWARD);
+        };
+
+        registry.addBuiltin("APPLE_LOG_to_ACES2065-1",
+                            "Convert Apple Log to ACES2065-1",
+                            APPLE_LOG_to_ACES2065_1_Functor);
+    }
+    {
+        auto APPLE_LOG_to_Linear_Functor = [](OpRcPtrVec & ops)
+        {
+            APPLE_LOG::GenerateAppleLogToLinearOps(ops);
+        };
+
+        registry.addBuiltin("CURVE - APPLE_LOG_to_LINEAR",
+                            "Convert Apple Log to linear",
+                            APPLE_LOG_to_Linear_Functor);
+    }
+}
+
+} // namespace APPLE
+
+} // namespace CAMERA
+
+} // namespace OCIO_NAMESPACE

src/OpenColorIO/transforms/builtins/AppleCameras.h

@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright Contributors to the OpenColorIO Project.
+
+
+#ifndef INCLUDED_OCIO_APPLE_CAMERAS_H
+#define INCLUDED_OCIO_APPLE_CAMERAS_H
+
+
+#include <OpenColorIO/OpenColorIO.h>
+
+
+namespace OCIO_NAMESPACE
+{
+
+class BuiltinTransformRegistryImpl;
+
+namespace CAMERA
+{
+
+namespace APPLE
+{
+
+void RegisterAll(BuiltinTransformRegistryImpl & registry) noexcept;
+
+} // namespace APPLE
+
+} // namespace CAMERA
+
+} // namespace OCIO_NAMESPACE
+
+#endif // INCLUDED_OCIO_APPLE_CAMERAS_H

src/OpenColorIO/transforms/builtins/BuiltinTransformRegistry.cpp

@@ -11,6 +11,7 @@
 #include "OpBuilders.h"
 #include "Platform.h"
 #include "transforms/builtins/ACES.h"
+#include "transforms/builtins/AppleCameras.h"
 #include "transforms/builtins/ArriCameras.h"
 #include "transforms/builtins/BuiltinTransformRegistry.h"
 #include "transforms/builtins/CanonCameras.h"
@@ -109,6 +110,7 @@ void BuiltinTransformRegistryImpl::registerAll() noexcept
     ACES::RegisterAll(*this);
 
     // Camera support.
+    CAMERA::APPLE::RegisterAll(*this);
     CAMERA::ARRI::RegisterAll(*this);
     CAMERA::CANON::RegisterAll(*this);
     CAMERA::PANASONIC::RegisterAll(*this);

tests/cpu/CMakeLists.txt

@@ -161,6 +161,7 @@ set(SOURCES
     ScanlineHelper.cpp
     Transform.cpp
     transforms/builtins/ACES.cpp
+    transforms/builtins/AppleCameras.cpp
     transforms/builtins/ArriCameras.cpp
     transforms/builtins/CanonCameras.cpp
     transforms/builtins/ColorMatrixHelpers.cpp

tests/cpu/Config_tests.cpp

@@ -2103,12 +2103,12 @@ OCIO_ADD_TEST(Config, version)
     {
         OCIO_CHECK_THROW_WHAT(config->setVersion(2, 9), OCIO::Exception,
                               "The minor version 9 is not supported for major version 2. "
-                              "Maximum minor version is 3");
+                              "Maximum minor version is 4");
 
         OCIO_CHECK_NO_THROW(config->setMajorVersion(2));
         OCIO_CHECK_THROW_WHAT(config->setMinorVersion(9), OCIO::Exception,
                               "The minor version 9 is not supported for major version 2. "
-                              "Maximum minor version is 3");
+                              "Maximum minor version is 4");
     }
 
     {
@@ -9471,4 +9471,4 @@ OCIO_ADD_TEST(Config, create_from_config_io_proxy)
         OCIO_REQUIRE_ASSERT(proc);
         OCIO_CHECK_NO_THROW(proc->getDefaultCPUProcessor());
     }
-}
+}

tests/cpu/transforms/BuiltinTransform_tests.cpp

@@ -429,6 +429,10 @@ AllValues UnitTestValues
     { "ACES-OUTPUT - ACES2065-1_to_CIE-XYZ-D65 - HDR-CINEMA-108nit-7.2nit-P3lim_1.1",
         { { 0.5f, 0.4f, 0.3f }, { 0.22214814f,     0.21179835f,     0.15639816f } } },
 
+    { "APPLE_LOG_to_ACES2065-1",
+        { { 0.5f, 0.4f, 0.3f }, { 0.153334766f,    0.083515430f,     0.032948254f } } },
+    { "CURVE - APPLE_LOG_to_LINEAR",
+        { { 0.5f, 0.4f, 0.3f }, { 0.198913991f,    0.083076466024f,  0.0315782763f } } },
     { "ARRI_ALEXA-LOGC-EI800-AWG_to_ACES2065-1",
         { { 0.5f, 0.4f, 0.3f }, { 0.401621427766f, 0.236455447604f,  0.064830001192f } } },
     { "ARRI_LOGC4_to_ACES2065-1",

tests/cpu/transforms/builtins/BuiltinTransformRegistry_tests.cpp

@@ -96,7 +96,7 @@ OCIO_ADD_TEST(Builtins, read_write)
     // builtin transforms.
 
     static constexpr char CONFIG_BUILTIN_TRANSFORMS[] {
-R"(ocio_profile_version: 2.3
+R"(ocio_profile_version: 2.4
 
 environment:
   {}