Ticket AcademySoftwareFoundation#2111

- Do not use config proxy for absolute paths while computing file hash or loading LUT data.
- Added the unit test provided in the ticket.

Signed-off-by: cuneyt.ozdas <[email protected]>

Author: cozdas

src/OpenColorIO/PathUtils.cpp

@@ -88,20 +88,20 @@ std::string GetFastFileHash(const std::string & filename, const Context & contex
             fileHashResultPtr->ready = true;
 
             std::string h = "";
-            if (!context.getConfigIOProxy())
+            if (!pystring::os::path::isabs(filename) && context.getConfigIOProxy())
             {
-                // Default case.
-                h = g_hashFunction(filename);
+                // Case for when ConfigIOProxy is used (callbacks mechanism).
+                h = context.getConfigIOProxy()->getFastLutFileHash(filename.c_str());
             }
             else
             {
-                // Case for when ConfigIOProxy is used (callbacks mechanism).
-                h = context.getConfigIOProxy()->getFastLutFileHash(filename.c_str());
+                // Default case
+                h = g_hashFunction(filename);
             }
 
             fileHashResultPtr->hash = h;
         }
-    
+
         hash = fileHashResultPtr->hash;
     }
 

src/OpenColorIO/transforms/FileTransform.cpp

@@ -190,7 +190,7 @@ std::unique_ptr<std::istream> getLutData(
     const std::string & filepath, 
     std::ios_base::openmode mode)
 {
-    if (config.getConfigIOProxy())
+    if (!pystring::os::path::isabs(filepath) && config.getConfigIOProxy())
     {
         std::vector<uint8_t> buffer = config.getConfigIOProxy()->getLutData(filepath.c_str());
         std::stringstream ss;

tests/cpu/OCIOZArchive_tests.cpp

@@ -331,6 +331,18 @@ OCIO_ADD_TEST(OCIOZArchive, context_test_for_search_paths_and_filetransform_sour
 
     auto testPaths = [&mat](const OCIO::ConfigRcPtr & cfg, const OCIO::ContextRcPtr ctx) 
     {
+        {
+            const std::string filePath = OCIO::GetTestFilesDir() + "/matrix_example4x4.ctf";
+            OCIO::FileTransformRcPtr transform = OCIO::FileTransform::Create();
+            transform->setSrc(filePath.c_str());
+            OCIO::ConstProcessorRcPtr processor = cfg->getProcessor(transform);
+            OCIO::ConstTransformRcPtr tr = processor->createGroupTransform()->getTransform(0);
+            auto mtx = OCIO::DynamicPtrCast<const OCIO::MatrixTransform>(tr);
+            OCIO_REQUIRE_ASSERT(mtx);
+            mtx->getMatrix(mat);
+            OCIO_CHECK_EQUAL(mat[0], 3.24);
+        }
+
         {
             // This is independent of the context.
             OCIO::ConstProcessorRcPtr processor = cfg->getProcessor(ctx, "shot1_lut1_cs", "reference");