From b438c2840cbf533830ecb29b1ef65325d3f77f73 Mon Sep 17 00:00:00 2001
From: "Sv. Lockal" <lockalsash@gmail.com>
Date: Mon, 5 Aug 2013 19:16:52 +0000
Subject: SplitViewer node: - fix thumbnail preview (previously it showed only
 one input) - make SplitViewer node update even if the second input is not
 connected - now it works when the first socket is connected to a zero-sized
 node tree (e. g. Color Input node) - SplitViewer node is now based on 2
 operations: SplitOperation and ViewerOperation. - ViewerBaseOperation was
 removed as a redundant one. Any future viewer style node can use the same
 principle and prepare the output before passing to an actual ViewerOperation.

Thanks Lukas Toenne for reviewing this patch and giving me get few pieces of advice.
---
 .../compositor/operations/COM_SplitOperation.cpp   | 81 ++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 source/blender/compositor/operations/COM_SplitOperation.cpp

(limited to 'source/blender/compositor/operations/COM_SplitOperation.cpp')

diff --git a/source/blender/compositor/operations/COM_SplitOperation.cpp b/source/blender/compositor/operations/COM_SplitOperation.cpp
new file mode 100644
index 00000000000..a7dbccfc2f7
--- /dev/null
+++ b/source/blender/compositor/operations/COM_SplitOperation.cpp
@@ -0,0 +1,81 @@
+/*
+ * 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_SplitOperation.h"
+#include "COM_SocketConnection.h"
+#include "BLI_listbase.h"
+#include "BKE_image.h"
+#include "BLI_utildefines.h"
+#include "BLI_math_color.h"
+#include "BLI_math_vector.h"
+
+extern "C" {
+	#include "MEM_guardedalloc.h"
+	#include "IMB_imbuf.h"
+	#include "IMB_imbuf_types.h"
+}
+
+
+SplitOperation::SplitOperation() : NodeOperation()
+{
+	this->addInputSocket(COM_DT_COLOR);
+	this->addInputSocket(COM_DT_COLOR);
+	this->addOutputSocket(COM_DT_COLOR);
+	this->m_image1Input = NULL;
+	this->m_image2Input = NULL;
+}
+
+void SplitOperation::initExecution()
+{
+	// When initializing the tree during initial load the width and height can be zero.
+	this->m_image1Input = getInputSocketReader(0);
+	this->m_image2Input = getInputSocketReader(1);
+}
+
+void SplitOperation::deinitExecution()
+{
+	this->m_image1Input = NULL;
+	this->m_image2Input = NULL;
+}
+
+void SplitOperation::executePixel(float output[4], float x, float y, PixelSampler sampler)
+{
+	int perc = this->m_xSplit ? this->m_splitPercentage * this->getWidth() / 100.0f : this->m_splitPercentage * this->getHeight() / 100.0f;
+	bool image1 = this->m_xSplit ? x > perc : y > perc;
+	if (image1) {
+		this->m_image1Input->read(output, x, y, COM_PS_NEAREST);
+	}
+	else {
+		this->m_image2Input->read(output, x, y, COM_PS_NEAREST);
+	}
+}
+
+void SplitOperation::determineResolution(unsigned int resolution[2], unsigned int preferredResolution[2])
+{
+	unsigned int tempPreferredResolution[2] = {0, 0};
+	unsigned int tempResolution[2];
+
+	this->getInputSocket(0)->determineResolution(tempResolution, tempPreferredResolution);
+	this->setResolutionInputSocketIndex((tempResolution[0] && tempResolution[1]) ? 0 : 1);
+
+	NodeOperation::determineResolution(resolution, preferredResolution);
+}
-- 
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