D627: Memory usage optimization for the compositor.

The compostor used a fixed size of 4 floats to hold pixel data. this
patch will select size of a pixel based on its type.
It uses 1 float for Value, 3 float for vector and 4 floats for color
data types.

When benchmarking on shots (opening shot of caminandes) we get a
reduction of memory of 30% and a tiny speedup as less data
transformations needs to take place (but these are negligable.

More information of the patch can be found on
https://developer.blender.org/D627 and
http://wiki.blender.org/index.php/Dev:Ref/Proposals/Compositor2014_p1.1_TD

Developers: jbakker & mdewanchand
Thanks for Sergey for his indept review.

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/compositor/intern/COM_OpenCLDevice.h b/source/blender/compositor/intern/COM_OpenCLDevice.h
index 94df2f2b44c..f8a8841ef47 100644
--- a/source/blender/compositor/intern/COM_OpenCLDevice.h
+++ b/source/blender/compositor/intern/COM_OpenCLDevice.h
@@ -94,6 +94,12 @@ public:
 	 */
 	void execute(WorkPackage *work);
 
+	/**
+	* @brief determine an image format
+	* @param memorybuffer
+	*/
+	static const cl_image_format* determineImageFormat(MemoryBuffer *memoryBuffer);
+
 	cl_context getContext() { return this->m_context; }
 
 	cl_command_queue getQueue() { return this->m_queue; }