Commit: 06ac6ded66fbbbce6d316ff44880897661b8e276
Author: Olly Funkster
Date:   Tue May 16 09:44:20 2017 +0200
Branches: master
https://developer.blender.org/rB06ac6ded66fbbbce6d316ff44880897661b8e276

Fix byte-to-float conversion when using scene strips in sequencer with 
identical color spaces

Fix T50882: VSE: Blend Modes on Scenes do not layer properly
Fix T51002: Scene strip with Alpha over not working as expected

The byte-to-float conversion was being skipped if the color spaces of the 
sequence and the scene
are the same, which is the default, resulting in any non-float strips becoming 
invisible.

Reviewers: sergey

Differential Revision: https://developer.blender.org/D2635

===================================================================

M       source/blender/imbuf/intern/colormanagement.c

===================================================================

diff --git a/source/blender/imbuf/intern/colormanagement.c 
b/source/blender/imbuf/intern/colormanagement.c
index fc382f02b2c..cdb8f2c6fa2 100644
--- a/source/blender/imbuf/intern/colormanagement.c
+++ b/source/blender/imbuf/intern/colormanagement.c
@@ -1759,9 +1759,14 @@ void 
IMB_colormanagement_transform_from_byte_threaded(float *float_buffer, unsig
                return;
        }
        if (STREQ(from_colorspace, to_colorspace)) {
-               /* If source and destination color spaces are identical, skip
-                * threading overhead and simply do nothing
+               /* Because this function always takes a byte buffer and returns 
a float buffer, it must
+                * always do byte-to-float conversion of some kind. To avoid 
threading overhead
+                * IMB_buffer_float_from_byte is used when color spaces are 
identical. See T51002.
                 */
+               IMB_buffer_float_from_byte(float_buffer, byte_buffer,
+                                          IB_PROFILE_SRGB, IB_PROFILE_SRGB,
+                                          true,
+                                          width, height, width, width);
                return;
        }
        cm_processor = 
IMB_colormanagement_colorspace_processor_new(from_colorspace, to_colorspace);

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