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, 2 insertions, 2 deletions

diff --git a/source/blender/compositor/operations/COM_KeyingBlurOperation.cpp b/source/blender/compositor/operations/COM_KeyingBlurOperation.cpp
index ddc09ecb483..72c7512cb23 100644
--- a/source/blender/compositor/operations/COM_KeyingBlurOperation.cpp
+++ b/source/blender/compositor/operations/COM_KeyingBlurOperation.cpp
@@ -58,7 +58,7 @@ void KeyingBlurOperation::executePixel(float output[4], int x, int y, void *data
 		const int start = max(0, x - this->m_size + 1),
 		          end = min(bufferWidth, x + this->m_size);
 		for (int cx = start; cx < end; ++cx) {
-			int bufferIndex = (y * bufferWidth + cx) * 4;
+			int bufferIndex = (y * bufferWidth + cx);
 			average += buffer[bufferIndex];
 			count++;
 		}
@@ -67,7 +67,7 @@ void KeyingBlurOperation::executePixel(float output[4], int x, int y, void *data
 		const int start = max(0, y - this->m_size + 1),
 		          end = min(inputBuffer->getHeight(), y + this->m_size);
 		for (int cy = start; cy < end; ++cy) {
-			int bufferIndex = (cy * bufferWidth + x) * 4;
+			int bufferIndex = (cy * bufferWidth + x);
 			average += buffer[bufferIndex];
 			count++;
 		}