1 files changed, 53 insertions, 0 deletions
diff --git a/source/blender/compositor/operations/COM_ColorCurveOperation.cc b/source/blender/compositor/operations/COM_ColorCurveOperation.cc
index cb0565a81a2..1b7ad0ea608 100644
--- a/source/blender/compositor/operations/COM_ColorCurveOperation.cc
+++ b/source/blender/compositor/operations/COM_ColorCurveOperation.cc
@@ -98,6 +98,36 @@ void ColorCurveOperation::deinitExecution()
   this->m_inputWhiteProgram = nullptr;
 }
 
+void ColorCurveOperation::update_memory_buffer_partial(MemoryBuffer *output,
+                                                       const rcti &area,
+                                                       Span<MemoryBuffer *> inputs)
+{
+  CurveMapping *cumap = this->m_curveMapping;
+  float bwmul[3];
+  for (BuffersIterator<float> it = output->iterate_with(inputs, area); !it.is_end(); ++it) {
+    /* Local versions of `cumap->black` and `cumap->white`. */
+    const float *black = it.in(2);
+    const float *white = it.in(3);
+    /* Get a local `bwmul` value, it's not threadsafe using `cumap->bwmul` and others. */
+    BKE_curvemapping_set_black_white_ex(black, white, bwmul);
+
+    const float fac = *it.in(0);
+    const float *image = it.in(1);
+    if (fac >= 1.0f) {
+      BKE_curvemapping_evaluate_premulRGBF_ex(cumap, it.out, image, black, bwmul);
+    }
+    else if (fac <= 0.0f) {
+      copy_v3_v3(it.out, image);
+    }
+    else {
+      float col[4];
+      BKE_curvemapping_evaluate_premulRGBF_ex(cumap, col, image, black, bwmul);
+      interp_v3_v3v3(it.out, image, col, fac);
+    }
+    it.out[3] = image[3];
+  }
+}
+
 // Constant level curve mapping
 
 ConstantLevelColorCurveOperation::ConstantLevelColorCurveOperation()
@@ -154,4 +184,27 @@ void ConstantLevelColorCurveOperation::deinitExecution()
   this->m_inputImageProgram = nullptr;
 }
 
+void ConstantLevelColorCurveOperation::update_memory_buffer_partial(MemoryBuffer *output,
+                                                                    const rcti &area,
+                                                                    Span<MemoryBuffer *> inputs)
+{
+  CurveMapping *cumap = this->m_curveMapping;
+  for (BuffersIterator<float> it = output->iterate_with(inputs, area); !it.is_end(); ++it) {
+    const float fac = *it.in(0);
+    const float *image = it.in(1);
+    if (fac >= 1.0f) {
+      BKE_curvemapping_evaluate_premulRGBF(cumap, it.out, image);
+    }
+    else if (fac <= 0.0f) {
+      copy_v3_v3(it.out, image);
+    }
+    else {
+      float col[4];
+      BKE_curvemapping_evaluate_premulRGBF(cumap, col, image);
+      interp_v3_v3v3(it.out, image, col, fac);
+    }
+    it.out[3] = image[3];
+  }
+}
+
 }  // namespace blender::compositor