Changes to compositor output node

Make it so compositor output node wouldn't be calculated
when Render Result image is not visible on the screen.
This makes compositor tree editing more friendly and
faster.

Also, if there's no viewer image visible on the screen
viewer nodes wouldn't be handled.

Final rendering keeps unchanged for now.

This solves issues when for performance artists are
disconnecting compo output node before tweaking values
in compositor and forgets to attach compo output
node before sending file to the farm.

1 files changed, 11 insertions, 2 deletions

diff --git a/source/blender/compositor/operations/COM_CompositorOperation.h b/source/blender/compositor/operations/COM_CompositorOperation.h
index 27d29664610..d33e89ed742 100644
--- a/source/blender/compositor/operations/COM_CompositorOperation.h
+++ b/source/blender/compositor/operations/COM_CompositorOperation.h
@@ -66,19 +66,28 @@ private:
 	 */
 	SocketReader *m_depthInput;
 
-	/* Ignore any alpha input */
+	/**
+	 * @brief Ignore any alpha input
+	 */
 	bool m_ignoreAlpha;
 
+	/**
+	 * @brief operation is active for calculating final compo result
+	 */
+	bool m_active;
 public:
 	CompositorOperation();
+	const bool isActiveCompositorOutput() const { return this->m_active; }
 	void executeRegion(rcti *rect, unsigned int tileNumber);
 	void setSceneName(const char *sceneName) { BLI_strncpy(this->m_sceneName, sceneName, sizeof(this->m_sceneName)); }
 	void setRenderData(const RenderData *rd) { this->m_rd = rd; }
-	bool isOutputOperation(bool rendering) const { return true; }
+	bool isOutputOperation(bool rendering) const { return this->isActiveCompositorOutput(); }
 	void initExecution();
 	void deinitExecution();
 	const CompositorPriority getRenderPriority() const { return COM_PRIORITY_MEDIUM; }
 	void determineResolution(unsigned int resolution[2], unsigned int preferredResolution[2]);
 	void setIgnoreAlpha(bool value) { this->m_ignoreAlpha = value; }
+	void setActive(bool active) { this->m_active = active; }
 };
 #endif
+