From c94877ae3d38f2bd0a772caa09ad84647641b7f3 Mon Sep 17 00:00:00 2001
From: Manuel Castilla <manzanillawork@gmail.com>
Date: Mon, 5 Jul 2021 19:53:39 +0200
Subject: Compositor: Full frame Gamma node

Adds full frame implementation to this node operation.
No functional changes.
1.5x faster than tiled fallback.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D11767
---
 source/blender/compositor/operations/COM_GammaOperation.cc | 14 ++++++++++++++
 source/blender/compositor/operations/COM_GammaOperation.h  |  6 ++++--
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/source/blender/compositor/operations/COM_GammaOperation.cc b/source/blender/compositor/operations/COM_GammaOperation.cc
index 343e335070a..7083c677f03 100644
--- a/source/blender/compositor/operations/COM_GammaOperation.cc
+++ b/source/blender/compositor/operations/COM_GammaOperation.cc
@@ -51,6 +51,20 @@ void GammaOperation::executePixelSampled(float output[4], float x, float y, Pixe
   output[3] = inputValue[3];
 }
 
+void GammaOperation::update_memory_buffer_row(PixelCursor &p)
+{
+  for (; p.out < p.row_end; p.next()) {
+    const float *in_value = p.ins[0];
+    const float *in_gamma = p.ins[1];
+    const float gamma = in_gamma[0];
+    /* Check for negative to avoid nan's. */
+    p.out[0] = in_value[0] > 0.0f ? powf(in_value[0], gamma) : in_value[0];
+    p.out[1] = in_value[1] > 0.0f ? powf(in_value[1], gamma) : in_value[1];
+    p.out[2] = in_value[2] > 0.0f ? powf(in_value[2], gamma) : in_value[2];
+    p.out[3] = in_value[3];
+  }
+}
+
 void GammaOperation::deinitExecution()
 {
   this->m_inputProgram = nullptr;
diff --git a/source/blender/compositor/operations/COM_GammaOperation.h b/source/blender/compositor/operations/COM_GammaOperation.h
index 034046106d6..713d3d8484f 100644
--- a/source/blender/compositor/operations/COM_GammaOperation.h
+++ b/source/blender/compositor/operations/COM_GammaOperation.h
@@ -18,11 +18,11 @@
 
 #pragma once
 
-#include "COM_NodeOperation.h"
+#include "COM_MultiThreadedRowOperation.h"
 
 namespace blender::compositor {
 
-class GammaOperation : public NodeOperation {
+class GammaOperation : public MultiThreadedRowOperation {
  private:
   /**
    * Cached reference to the inputProgram
@@ -47,6 +47,8 @@ class GammaOperation : public NodeOperation {
    * Deinitialize the execution
    */
   void deinitExecution() override;
+
+  void update_memory_buffer_row(PixelCursor &p) override;
 };
 
 }  // namespace blender::compositor
-- 
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