Solved issue with distorted compositor results in some cases

Originally issue was discovered when using stabilization and movie distortion
nodes, but in fact issue was caused by render layer node always doing nearest
interpolation. Now made it so this node will respect sampler passed to it's
executePixel function and do an interpolation.

Added two new functions to do bilinear/bicubic interpolation in float buffer
with variable number of components per element, so it could interpolate 1, 3
and 4 component vectors. This functions currently mostly duplicates the same
functions from imageprocess.c and it should actually be de-duplicated. Think
it's ok to leave a bit of time with such duplication, since functions should
be generalized one more time to support byte buffers, which could backfire on
readability.

Also removed mark as complex from stabilization node, which isn't needed sine
int fact this node is not complex.

1 files changed, 15 insertions, 3 deletions

diff --git a/source/blender/compositor/operations/COM_ScaleOperation.h b/source/blender/compositor/operations/COM_ScaleOperation.h
index 4239ff063fb..f42cdbd78ed 100644
--- a/source/blender/compositor/operations/COM_ScaleOperation.h
+++ b/source/blender/compositor/operations/COM_ScaleOperation.h
@@ -25,7 +25,19 @@
 
 #include "COM_NodeOperation.h"
 
-class ScaleOperation : public NodeOperation {
+class BaseScaleOperation : public NodeOperation {
+public:
+	void setSampler(PixelSampler sampler) { this->m_sampler = (int) sampler; }
+
+protected:
+	BaseScaleOperation();
+
+	PixelSampler getEffectiveSampler(PixelSampler sampler) { return (m_sampler == -1) ? sampler : (PixelSampler) m_sampler;  }
+
+	int m_sampler;
+};
+
+class ScaleOperation : public BaseScaleOperation {
 private:
 	SocketReader *m_inputOperation;
 	SocketReader *m_inputXOperation;
@@ -41,7 +53,7 @@ public:
 	void deinitExecution();
 };
 
-class ScaleAbsoluteOperation : public NodeOperation {
+class ScaleAbsoluteOperation : public BaseScaleOperation {
 	SocketReader *m_inputOperation;
 	SocketReader *m_inputXOperation;
 	SocketReader *m_inputYOperation;
@@ -57,7 +69,7 @@ public:
 	void deinitExecution();
 };
 
-class ScaleFixedSizeOperation : public NodeOperation {
+class ScaleFixedSizeOperation : public BaseScaleOperation {
 	SocketReader *m_inputOperation;
 	int m_newWidth;
 	int m_newHeight;