1 files changed, 40 insertions, 0 deletions
diff --git a/source/blender/compositor/operations/COM_MapRangeOperation.cc b/source/blender/compositor/operations/COM_MapRangeOperation.cc
index ada3cd6f159..82fb033bf24 100644
--- a/source/blender/compositor/operations/COM_MapRangeOperation.cc
+++ b/source/blender/compositor/operations/COM_MapRangeOperation.cc
@@ -30,6 +30,7 @@ MapRangeOperation::MapRangeOperation()
   this->addOutputSocket(DataType::Value);
   this->m_inputOperation = nullptr;
   this->m_useClamp = false;
+  flags.can_be_constant = true;
 }
 
 void MapRangeOperation::initExecution()
@@ -104,4 +105,43 @@ void MapRangeOperation::deinitExecution()
   this->m_destMaxOperation = nullptr;
 }
 
+void MapRangeOperation::update_memory_buffer_partial(MemoryBuffer *output,
+                                                     const rcti &area,
+                                                     Span<MemoryBuffer *> inputs)
+{
+  for (BuffersIterator<float> it = output->iterate_with(inputs, area); !it.is_end(); ++it) {
+    const float source_min = *it.in(1);
+    const float source_max = *it.in(2);
+    if (fabsf(source_max - source_min) < 1e-6f) {
+      it.out[0] = 0.0f;
+      continue;
+    }
+
+    float value = *it.in(0);
+    const float dest_min = *it.in(3);
+    const float dest_max = *it.in(4);
+    if (value >= -BLENDER_ZMAX && value <= BLENDER_ZMAX) {
+      value = (value - source_min) / (source_max - source_min);
+      value = dest_min + value * (dest_max - dest_min);
+    }
+    else if (value > BLENDER_ZMAX) {
+      value = dest_max;
+    }
+    else {
+      value = dest_min;
+    }
+
+    if (m_useClamp) {
+      if (dest_max > dest_min) {
+        CLAMP(value, dest_min, dest_max);
+      }
+      else {
+        CLAMP(value, dest_max, dest_min);
+      }
+    }
+
+    it.out[0] = value;
+  }
+}
+
 }  // namespace blender::compositor