Compositor: Full frame Image node

Adds full frame implementation to Image node operations.
Mostly refactored into buffer utility methods for reuse in other
operations.
No functional changes.
1.8x faster than tiled fallback.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D11559

1 files changed, 18 insertions, 0 deletions

diff --git a/source/blender/compositor/COM_defines.h b/source/blender/compositor/COM_defines.h
index 5a52d216117..857cbf0beee 100644
--- a/source/blender/compositor/COM_defines.h
+++ b/source/blender/compositor/COM_defines.h
@@ -62,6 +62,24 @@ constexpr int COM_data_type_num_channels(const DataType datatype)
 constexpr int COM_DATA_TYPE_VALUE_CHANNELS = COM_data_type_num_channels(DataType::Value);
 constexpr int COM_DATA_TYPE_COLOR_CHANNELS = COM_data_type_num_channels(DataType::Color);
 
+constexpr float COM_VALUE_ZERO[1] = {0.0f};
+
+/**
+ * Utility to get data type for given number of channels.
+ */
+constexpr DataType COM_num_channels_data_type(const int num_channels)
+{
+  switch (num_channels) {
+    case 1:
+      return DataType::Value;
+    case 3:
+      return DataType::Vector;
+    case 4:
+    default:
+      return DataType::Color;
+  }
+}
+
 // configurable items
 
 // chunk size determination