Fix #32603: Multi-Layer EXR files can't be color managed

Issue was caused by completely different way how multi-layer EXRs are loading,
they're bypassing general image buffer loading functions.

Solved by running color space transformation on render result construction
from multi-layer EXR image.

Also fixed issue with wrong display buffer computing for buffers with less
than 4 channels. Issues were:

- Display buffer is always expected to be RGBA
- OpenColorIO can not apply color space transformations on non-{RGB, RGBA}
  pixels.

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/render/extern/include/RE_pipeline.h b/source/blender/render/extern/include/RE_pipeline.h
index b43824d6d5e..c7a8bfeec1d 100644
--- a/source/blender/render/extern/include/RE_pipeline.h
+++ b/source/blender/render/extern/include/RE_pipeline.h
@@ -225,7 +225,7 @@ void RE_PreviewRender(struct Render *re, struct Main *bmain, struct Scene *scene
 
 int RE_ReadRenderResult(struct Scene *scene, struct Scene *scenode);
 int RE_WriteRenderResult(struct ReportList *reports, RenderResult *rr, const char *filename, int compress);
-struct RenderResult *RE_MultilayerConvert(void *exrhandle, int rectx, int recty);
+struct RenderResult *RE_MultilayerConvert(void *exrhandle, const char *colorspace, int predivide, int rectx, int recty);
 
 extern const float default_envmap_layout[];
 int RE_WriteEnvmapResult(struct ReportList *reports, struct Scene *scene, struct EnvMap *env, const char *relpath, const char imtype, float layout[12]);