1 files changed, 46 insertions, 0 deletions
diff --git a/source/blender/compositor/operations/COM_RenderLayersAlphaProg.cpp b/source/blender/compositor/operations/COM_RenderLayersAlphaProg.cpp
new file mode 100644
index 00000000000..d85d54489ac
--- /dev/null
+++ b/source/blender/compositor/operations/COM_RenderLayersAlphaProg.cpp
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2011, 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
+ */
+
+#include "COM_RenderLayersAlphaProg.h"
+
+RenderLayersAlphaProg::RenderLayersAlphaProg() :RenderLayersBaseProg(SCE_PASS_COMBINED, 4) {
+	this->addOutputSocket(COM_DT_VALUE);
+}
+
+void RenderLayersAlphaProg::executePixel(float* output, float x, float y, PixelSampler sampler, MemoryBuffer *inputBuffers[]) {
+	int ix = x;
+	int iy = y;
+	float * inputBuffer = this->getInputBuffer();
+
+	if (inputBuffer == NULL || ix < 0 || iy < 0 || ix >= (int)this->getWidth() || iy >= (int)this->getHeight() ) {
+		output[0] = 0.0f;
+		output[1] = 0.0f;
+		output[2] = 0.0f;
+		output[3] = 0.0f;
+	} else {
+		unsigned int offset = (iy*this->getWidth()+ix) * 4;
+		output[0] = inputBuffer[offset+3];
+		output[1] = 0.0f;
+		output[2] = 0.0f;
+		output[3] = 0.0f;
+	}
+}