Performance: Use parallel range for ImBuf scanline processor.

Scanline processor did its own heurestic what didn't scale well when
having a multiple cores. In stead of using our own code this patch will
leave it to TBB to determine how to split the scanlines over the
available threads.

Performance of the IMB_transform before this change was 0.002123s, with
this change 0.001601s. This change increases performance in other areas
as well including color management conversions.

Reviewed By: zeddb

Differential Revision: https://developer.blender.org/D11578

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/imbuf/IMB_imbuf.h b/source/blender/imbuf/IMB_imbuf.h
index 651c69726ff..69a80d6e0d3 100644
--- a/source/blender/imbuf/IMB_imbuf.h
+++ b/source/blender/imbuf/IMB_imbuf.h
@@ -733,7 +733,7 @@ void IMB_processor_apply_threaded(
     void(init_handle)(void *handle, int start_line, int tot_line, void *customdata),
     void *(do_thread)(void *));
 
-typedef void (*ScanlineThreadFunc)(void *custom_data, int start_scanline, int num_scanlines);
+typedef void (*ScanlineThreadFunc)(void *custom_data, int scanline);
 void IMB_processor_apply_threaded_scanlines(int total_scanlines,
                                             ScanlineThreadFunc do_thread,
                                             void *custom_data);