Kaying node from tomato branch

Merge keying node from tomato branch into trunk.

It was considered stable and helpful by Mango team and it'll help
studio pipeline, because nodes would stop disappearing when opening
files in current trunk.

Full information about keying nodes could be found there:
http://wiki.blender.org/index.php/User:Nazg-gul/Keying

1 files changed, 123 insertions, 0 deletions

diff --git a/source/blender/compositor/operations/COM_KeyingClipOperation.cpp b/source/blender/compositor/operations/COM_KeyingClipOperation.cpp
new file mode 100644
index 00000000000..09b5b7a523c
--- /dev/null
+++ b/source/blender/compositor/operations/COM_KeyingClipOperation.cpp
@@ -0,0 +1,123 @@
+/*
+ * Copyright 2012, Blender Foundation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contributor:
+ *		Jeroen Bakker
+ *		Monique Dewanchand
+ *		Sergey Sharybin
+ */
+
+#include "COM_KeyingClipOperation.h"
+
+#include "MEM_guardedalloc.h"
+
+#include "BLI_listbase.h"
+#include "BLI_math.h"
+
+KeyingClipOperation::KeyingClipOperation(): NodeOperation()
+{
+	this->addInputSocket(COM_DT_VALUE);
+	this->addOutputSocket(COM_DT_VALUE);
+
+	this->kernelRadius = 3;
+	this->kernelTolerance = 0.1f;
+
+	this->clipBlack = 0.0f;
+	this->clipWhite = 1.0f;
+
+	this->isEdgeMatte = false;
+
+	this->setComplex(true);
+}
+
+void *KeyingClipOperation::initializeTileData(rcti *rect, MemoryBuffer **memoryBuffers)
+{
+	void *buffer = getInputOperation(0)->initializeTileData(rect, memoryBuffers);
+
+	return buffer;
+}
+
+void KeyingClipOperation::executePixel(float *color, int x, int y, MemoryBuffer *inputBuffers[], void *data)
+{
+	const int delta = this->kernelRadius;
+	const float tolerance = this->kernelTolerance;
+
+	MemoryBuffer *inputBuffer = (MemoryBuffer*)data;
+	float *buffer = inputBuffer->getBuffer();
+
+	int bufferWidth = inputBuffer->getWidth();
+	int bufferHeight = inputBuffer->getHeight();
+
+	int i, j, count = 0, totalCount = 0;
+
+	float value = buffer[(y * bufferWidth + x) * 4];
+
+	bool ok = false;
+
+	for (i = -delta + 1; i < delta; i++) {
+		for (j = -delta + 1; j < delta; j++) {
+			int cx = x + j, cy = y + i;
+
+			if (i == 0 && j == 0)
+				continue;
+
+			if (cx >= 0 && cx < bufferWidth && cy >= 0 && cy < bufferHeight) {
+				int bufferIndex = (cy * bufferWidth + cx) * 4;
+				float currentValue = buffer[bufferIndex];
+
+				if (fabsf(currentValue - value) < tolerance) {
+					count++;
+				}
+
+				totalCount++;
+			}
+		}
+	}
+
+	ok = count >= (float) totalCount * 0.9f;
+
+	if (this->isEdgeMatte) {
+		if (ok)
+			color[0] = 0.0f;
+		else
+			color[0] = 1.0f;
+	}
+	else {
+		color[0] = value;
+
+		if (ok) {
+			if (color[0] < this->clipBlack)
+				color[0] = 0.0f;
+			else if (color[0] >= this->clipWhite)
+				color[0] = 1.0f;
+			else
+				color[0] = (color[0] - this->clipBlack) / (this->clipWhite - this->clipBlack);
+		}
+	}
+}
+
+bool KeyingClipOperation::determineDependingAreaOfInterest(rcti *input, ReadBufferOperation *readOperation, rcti *output)
+{
+	rcti newInput;
+
+	newInput.xmin = 0;
+	newInput.ymin = 0;
+	newInput.xmax = this->getWidth();
+	newInput.ymax = this->getHeight();
+
+	return NodeOperation::determineDependingAreaOfInterest(&newInput, readOperation, output);
+}