Color Management, Stage 1: Initial OpenColorIO library integration

This commit integrates support of OpenColorIO library into build systems.

It also contains C-API for OpenColorIO library which could be used by Blender.

CMake has got find rules familiar to OpenImageIO's one which makes it easier
for build system to find needed libraries and includes. Scons only could use
explicitly defined paths to libraries and includes.

C-API would be compiled and Blender would be linked against C-API and OpenColorIO
but it wouldn't affect on Blender behavior at all.

OpenColorIO could be disabled by setting up WITH_OCIO to Off in CMake and
setting WITH_BF_OCIO in Scons.

5 files changed, 1114 insertions, 0 deletions

diff --git a/intern/opencolorio/CMakeLists.txt b/intern/opencolorio/CMakeLists.txt
new file mode 100644
index 00000000000..479bbd3ab0a
--- /dev/null
+++ b/intern/opencolorio/CMakeLists.txt
@@ -0,0 +1,62 @@
+# ***** BEGIN GPL LICENSE BLOCK *****
+#
+# 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.
+#
+# The Original Code is Copyright (C) 2012, Blender Foundation
+# All rights reserved.
+#
+# The Original Code is: all of this file.
+#
+# Contributor(s): Sergey Sharybin.
+#
+# ***** END GPL LICENSE BLOCK *****
+
+if(WITH_OPENCOLORIO)
+	set(INC
+		.
+		${OPENCOLORIO_INCLUDE_DIRS}
+	)
+
+	set(SRC
+		ocio_capi.cpp
+		ocio_capi.h
+	)
+
+	if(WIN32 AND NOT MINGW)
+		list(APPEND INC
+			${BOOST_INCLUDE_DIR}
+		)
+	endif()
+else()
+	set(INC
+		.
+		../../source/blender/blenlib
+	)
+
+	set(SRC
+		ocio_capi_stub.cpp
+		ocio_capi.h
+	)
+endif()
+
+set(INC_SYS
+	../guardedalloc
+)
+
+add_definitions(
+)
+
+blender_add_lib(bf_intern_opencolorio "${SRC}" "${INC}" "${INC_SYS}")
+
diff --git a/intern/opencolorio/SConscript b/intern/opencolorio/SConscript
new file mode 100644
index 00000000000..fec07662735
--- /dev/null
+++ b/intern/opencolorio/SConscript
@@ -0,0 +1,19 @@
+#!/usr/bin/python
+
+Import('env')
+
+sources = env.Glob('*.cpp')
+
+incs = '. ../guardedalloc ../../source/blender/blenlib'
+
+if env['WITH_BF_OCIO']:
+    sources.remove('ocio_capi_stub.cpp')
+
+    incs += ' ' + env['BF_OCIO_INC']
+
+    if env['OURPLATFORM'] in ('win32-vc', 'win64-vc'):
+        incs += ' ' + env['BF_BOOST_INC']
+else:
+    sources.remove('ocio_capi.cpp')
+
+env.BlenderLib( 'bf_intern_opencolorio', sources, Split(incs), [], libtype=['extern','player'], priority=[10, 185])
diff --git a/intern/opencolorio/ocio_capi.cpp b/intern/opencolorio/ocio_capi.cpp
new file mode 100644
index 00000000000..ec8012cc30f
--- /dev/null
+++ b/intern/opencolorio/ocio_capi.cpp
@@ -0,0 +1,525 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * 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.
+ *
+ * The Original Code is Copyright (C) 2012 Blender Foundation.
+ * All rights reserved.
+ *
+ * Contributor(s): Xavier Thomas
+ *                 Lukas Toene,
+ *                 Sergey Sharybin
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#include <iostream>
+#include <string.h>
+
+#include <OpenColorIO/OpenColorIO.h>
+
+#include "MEM_guardedalloc.h"
+
+#define OCIO_CAPI_IMPLEMENTATION
+#include "ocio_capi.h"
+
+#ifdef NDEBUG
+#  define OCIO_abort()
+#else
+#  include <stdlib.h>
+#  define OCIO_abort() abort()
+#endif
+
+#if defined(_MSC_VER)
+#  define __func__ __FUNCTION__
+#endif
+
+#define MEM_NEW(type) new(MEM_mallocN(sizeof(type), __func__)) type()
+#define MEM_DELETE(what, type) { what->~type(); MEM_freeN(what); } (void)0
+
+static void OCIO_reportError(const char *err)
+{
+	std::cerr << "OpenColorIO Error: " << err << std::endl;
+
+	OCIO_abort();
+}
+
+static void OCIO_reportException(Exception &exception)
+{
+	OCIO_reportError(exception.what());
+}
+
+ConstConfigRcPtr *OCIO_getCurrentConfig(void)
+{
+	ConstConfigRcPtr *config = MEM_NEW(ConstConfigRcPtr);
+
+	try {
+		*config = GetCurrentConfig();
+
+		if(*config)
+			return config;
+	}
+	catch (Exception &exception) {
+		OCIO_reportException(exception);
+	}
+
+	return NULL;
+}
+
+void OCIO_setCurrentConfig(const ConstConfigRcPtr *config)
+{
+	try {
+		SetCurrentConfig(*config);
+	}
+	catch (Exception &exception) {
+		OCIO_reportException(exception);
+	}
+}
+
+ConstConfigRcPtr *OCIO_configCreateFromEnv(void)
+{
+	ConstConfigRcPtr *config = MEM_NEW(ConstConfigRcPtr);
+
+	try {
+		*config = Config::CreateFromEnv();
+
+		if (*config)
+			return config;
+	}
+	catch (Exception &exception) {
+		OCIO_reportException(exception);
+	}
+
+	return NULL;
+}
+
+
+ConstConfigRcPtr *OCIO_configCreateFromFile(const char *filename)
+{
+	ConstConfigRcPtr *config = MEM_NEW(ConstConfigRcPtr);
+
+	try {
+		*config = Config::CreateFromFile(filename);
+
+		if (*config)
+			return config;
+	}
+	catch (Exception &exception) {
+		OCIO_reportException(exception);
+	}
+
+	return NULL;
+}
+
+void OCIO_configRelease(ConstConfigRcPtr *config)
+{
+	MEM_DELETE(config, ConstConfigRcPtr);
+}
+
+int OCIO_configGetNumColorSpaces(ConstConfigRcPtr *config)
+{
+	try {
+		return (*config)->getNumColorSpaces();
+	}
+	catch (Exception &exception) {
+		OCIO_reportException(exception);
+	}
+
+	return 0;
+}
+
+const char *OCIO_configGetColorSpaceNameByIndex(ConstConfigRcPtr *config, int index)
+{
+	try {
+		return (*config)->getColorSpaceNameByIndex(index);
+	}
+	catch (Exception &exception) {
+		OCIO_reportException(exception);
+	}
+
+	return NULL;
+}
+
+ConstColorSpaceRcPtr *OCIO_configGetColorSpace(ConstConfigRcPtr *config, const char *name)
+{
+	ConstColorSpaceRcPtr *cs = MEM_NEW(ConstColorSpaceRcPtr);
+
+	try {
+		*cs = (*config)->getColorSpace(name);
+
+		if (*cs)
+			return cs;
+	}
+	catch (Exception &exception) {
+		OCIO_reportException(exception);
+		MEM_DELETE(cs, ConstColorSpaceRcPtr);
+	}
+
+	return NULL;
+}
+
+int OCIO_configGetIndexForColorSpace(ConstConfigRcPtr *config, const char *name)
+{
+	try {
+		return (*config)->getIndexForColorSpace(name);
+	}
+	catch (Exception &exception) {
+		OCIO_reportException(exception);
+	}
+
+	return -1;
+}
+
+const char *OCIO_configGetDefaultDisplay(ConstConfigRcPtr *config)
+{
+	try {
+		return (*config)->getDefaultDisplay();
+	}
+	catch (Exception &exception) {
+		OCIO_reportException(exception);
+	}
+
+	return NULL;
+}
+
+int OCIO_configGetNumDisplays(ConstConfigRcPtr* config)
+{
+	try {
+		return (*config)->getNumDisplays();
+	}
+	catch (Exception &exception) {
+		OCIO_reportException(exception);
+	}
+
+	return 0;
+}
+
+const char *OCIO_configGetDisplay(ConstConfigRcPtr *config, int index)
+{
+	try {
+		return (*config)->getDisplay(index);
+	}
+	catch (Exception &exception) {
+		OCIO_reportException(exception);
+	}
+
+	return NULL;
+}
+
+const char *OCIO_configGetDefaultView(ConstConfigRcPtr *config, const char *display)
+{
+	try {
+		return (*config)->getDefaultView(display);
+	}
+	catch (Exception &exception) {
+		OCIO_reportException(exception);
+	}
+
+	return NULL;
+}
+
+int OCIO_configGetNumViews(ConstConfigRcPtr *config, const char *display)
+{
+	try {
+		return (*config)->getNumViews(display);
+	}
+	catch (Exception &exception) {
+		OCIO_reportException(exception);
+	}
+
+	return 0;
+}
+
+const char *OCIO_configGetView(ConstConfigRcPtr *config, const char *display, int index)
+{
+	try {
+		return (*config)->getView(display, index);
+	}
+	catch (Exception &exception) {
+		OCIO_reportException(exception);
+	}
+
+	return NULL;
+}
+
+const char *OCIO_configGetDisplayColorSpaceName(ConstConfigRcPtr *config, const char *display, const char *view)
+{
+	try {
+		return (*config)->getDisplayColorSpaceName(display, view);
+	}
+	catch (Exception &exception) {
+		OCIO_reportException(exception);
+	}
+
+	return NULL;
+}
+
+int OCIO_colorSpaceIsInvertible(ConstColorSpaceRcPtr *cs)
+{
+	const char *family = (*cs)->getFamily();
+
+	if (!strcmp(family, "rrt") || !strcmp(family, "display")) {
+		/* assume display and rrt transformations are not invertible
+		 * in fact some of them could be, but it doesn't make much sense to allow use them as invertible
+		 */
+		return false;
+	}
+
+	if ((*cs)->isData()) {
+		/* data color spaces don't have transformation at all */
+		return true;
+	}
+
+	if ((*cs)->getTransform(COLORSPACE_DIR_TO_REFERENCE)) {
+		/* if there's defined transform to reference space, color space could be converted to scene linear */
+		return true;
+	}
+
+	return true;
+}
+
+void OCIO_colorSpaceRelease(ConstColorSpaceRcPtr *cs)
+{
+	MEM_DELETE(cs, ConstColorSpaceRcPtr);
+}
+
+ConstProcessorRcPtr *OCIO_configGetProcessorWithNames(ConstConfigRcPtr *config, const char *srcName, const char *dstName)
+{
+	ConstProcessorRcPtr *p = MEM_NEW(ConstProcessorRcPtr);
+
+	try {
+		*p = (*config)->getProcessor(srcName, dstName);
+
+		if (*p)
+			return p;
+	}
+	catch (Exception &exception) {
+		OCIO_reportException(exception);
+	}
+
+	return 0;
+}
+
+ConstProcessorRcPtr *OCIO_configGetProcessor(ConstConfigRcPtr *config, ConstTransformRcPtr *transform)
+{
+	ConstProcessorRcPtr *p = MEM_NEW(ConstProcessorRcPtr);
+
+	try {
+		*p = (*config)->getProcessor(*transform);
+
+		if (*p)
+			return p;
+	}
+	catch (Exception &exception) {
+		OCIO_reportException(exception);
+	}
+
+	return NULL;
+}
+
+void OCIO_processorApply(ConstProcessorRcPtr *processor, PackedImageDesc *img)
+{
+	try {
+		(*processor)->apply(*img);
+	}
+	catch (Exception &exception) {
+		OCIO_reportException(exception);
+	}
+}
+
+void OCIO_processorApply_predivide(ConstProcessorRcPtr *processor, PackedImageDesc *img)
+{
+	try {
+		int channels = img->getNumChannels();
+
+		if (channels == 4) {
+			float *pixels = img->getData();
+
+			int width = img->getWidth();
+			int height = img->getHeight();
+
+			for (int y = 0; y < height; y++) {
+				for (int x = 0; x < width; x++) {
+					float *pixel = pixels + 4 * (y * width + x);
+
+					OCIO_processorApplyRGBA_predivide(processor, pixel);
+				}
+			}
+		}
+		else {
+			(*processor)->apply(*img);
+		}
+	}
+	catch (Exception &exception) {
+		OCIO_reportException(exception);
+	}
+}
+
+void OCIO_processorApplyRGB(ConstProcessorRcPtr *processor, float *pixel)
+{
+	(*processor)->applyRGB(pixel);
+}
+
+void OCIO_processorApplyRGBA(ConstProcessorRcPtr *processor, float *pixel)
+{
+	(*processor)->applyRGBA(pixel);
+}
+
+void OCIO_processorApplyRGBA_predivide(ConstProcessorRcPtr *processor, float *pixel)
+{
+	if (pixel[3] == 1.0f || pixel[3] == 0.0f) {
+		(*processor)->applyRGBA(pixel);
+	}
+	else {
+		float alpha, inv_alpha;
+
+		alpha = pixel[3];
+		inv_alpha = 1.0f / alpha;
+
+		pixel[0] *= inv_alpha;
+		pixel[1] *= inv_alpha;
+		pixel[2] *= inv_alpha;
+
+		(*processor)->applyRGBA(pixel);
+
+		pixel[0] *= alpha;
+		pixel[1] *= alpha;
+		pixel[2] *= alpha;
+	}
+}
+
+void OCIO_processorRelease(ConstProcessorRcPtr *p)
+{
+	p->~ConstProcessorRcPtr();
+	MEM_freeN(p);
+}
+
+const char *OCIO_colorSpaceGetName(ConstColorSpaceRcPtr *cs)
+{
+	return (*cs)->getName();
+}
+
+const char *OCIO_colorSpaceGetDescription(ConstColorSpaceRcPtr *cs)
+{
+	return (*cs)->getDescription();
+}
+
+const char *OCIO_colorSpaceGetFamily(ConstColorSpaceRcPtr *cs)
+{
+	return (*cs)->getFamily();
+}
+
+DisplayTransformRcPtr *OCIO_createDisplayTransform(void)
+{
+	DisplayTransformRcPtr *dt = MEM_NEW(DisplayTransformRcPtr);
+
+	*dt = DisplayTransform::Create();
+
+	return dt;
+}
+
+void OCIO_displayTransformSetInputColorSpaceName(DisplayTransformRcPtr *dt, const char *name)
+{
+	(*dt)->setInputColorSpaceName(name);
+}
+
+void OCIO_displayTransformSetDisplay(DisplayTransformRcPtr *dt, const char *name)
+{
+	(*dt)->setDisplay(name);
+}
+
+void OCIO_displayTransformSetView(DisplayTransformRcPtr *dt, const char *name)
+{
+	(*dt)->setView(name);
+}
+
+void OCIO_displayTransformSetDisplayCC(DisplayTransformRcPtr *dt, ConstTransformRcPtr *t)
+{
+	(*dt)->setDisplayCC(*t);
+}
+
+void OCIO_displayTransformSetLinearCC(DisplayTransformRcPtr *dt, ConstTransformRcPtr *t)
+{
+	(*dt)->setLinearCC(*t);
+}
+
+void OCIO_displayTransformRelease(DisplayTransformRcPtr *dt)
+{
+	MEM_DELETE(dt, DisplayTransformRcPtr);
+}
+
+PackedImageDesc *OCIO_createPackedImageDesc(float *data, long width, long height, long numChannels,
+                                            long chanStrideBytes, long xStrideBytes, long yStrideBytes)
+{
+	try {
+		void *mem = MEM_mallocN(sizeof(PackedImageDesc), __func__);
+		PackedImageDesc *id = new(mem) PackedImageDesc(data, width, height, numChannels, chanStrideBytes, xStrideBytes, yStrideBytes);
+
+		return id;
+	}
+	catch (Exception &exception) {
+		OCIO_reportException(exception);
+	}
+
+	return NULL;
+}
+
+void OCIO_packedImageDescRelease(PackedImageDesc* id)
+{
+	MEM_DELETE(id, PackedImageDesc);
+}
+
+ExponentTransformRcPtr *OCIO_createExponentTransform(void)
+{
+	ExponentTransformRcPtr *et = MEM_NEW(ExponentTransformRcPtr);
+
+	*et = ExponentTransform::Create();
+
+	return et;
+}
+
+void OCIO_exponentTransformSetValue(ExponentTransformRcPtr *et, const float *exponent)
+{
+	(*et)->setValue(exponent);
+}
+
+void OCIO_exponentTransformRelease(ExponentTransformRcPtr *et)
+{
+	MEM_DELETE(et, ExponentTransformRcPtr);
+}
+
+MatrixTransformRcPtr *OCIO_createMatrixTransform(void)
+{
+	MatrixTransformRcPtr *mt = MEM_NEW(MatrixTransformRcPtr);
+
+	*mt = MatrixTransform::Create();
+
+	return mt;
+}
+
+void OCIO_matrixTransformSetValue(MatrixTransformRcPtr *mt, const float *m44, const float *offset4)
+{
+	(*mt)->setValue(m44, offset4);
+}
+
+void OCIO_matrixTransformRelease(MatrixTransformRcPtr *mt)
+{
+	MEM_DELETE(mt, MatrixTransformRcPtr);
+}
+
+void OCIO_matrixTransformScale(float * m44, float * offset4, const float *scale4f)
+{
+	MatrixTransform::Scale(m44, offset4, scale4f);
+}
diff --git a/intern/opencolorio/ocio_capi.h b/intern/opencolorio/ocio_capi.h
new file mode 100644
index 00000000000..f0edd25ac14
--- /dev/null
+++ b/intern/opencolorio/ocio_capi.h
@@ -0,0 +1,128 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * 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.
+ *
+ * The Original Code is Copyright (C) 2012 Blender Foundation.
+ * All rights reserved.
+ *
+ * Contributor(s): Xavier Thomas
+ *                 Lukas Toene
+ *                 Sergey Sharybin
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#ifndef __OCIO_CAPI_H__
+#define __OCIO_CAPI_H__
+
+
+
+#ifdef __cplusplus
+using namespace OCIO_NAMESPACE;
+extern "C" {
+#endif
+
+#define OCIO_DECLARE_HANDLE(name) typedef struct name##__ { int unused; } *name
+
+
+#ifndef OCIO_CAPI_IMPLEMENTATION
+	#define OCIO_ROLE_SCENE_LINEAR       "scene_linear"
+	#define OCIO_ROLE_COLOR_PICKING      "color_picking"
+	#define OCIO_ROLE_TEXTURE_PAINT      "texture_paint"
+	#define OCIO_ROLE_DEFAULT_BYTE       "default_byte"
+	#define OCIO_ROLE_DEFAULT_FLOAT      "default_float"
+	#define OCIO_ROLE_DEFAULT_SEQUENCER  "default_sequencer"
+
+	OCIO_DECLARE_HANDLE(ConstConfigRcPtr);
+	OCIO_DECLARE_HANDLE(ConstColorSpaceRcPtr);
+	OCIO_DECLARE_HANDLE(ConstProcessorRcPtr);
+	OCIO_DECLARE_HANDLE(ConstContextRcPtr);
+	OCIO_DECLARE_HANDLE(PackedImageDesc);
+	OCIO_DECLARE_HANDLE(DisplayTransformRcPtr);
+	OCIO_DECLARE_HANDLE(ConstTransformRcPtr);
+	OCIO_DECLARE_HANDLE(ExponentTransformRcPtr);
+	OCIO_DECLARE_HANDLE(MatrixTransformRcPtr);
+#endif
+
+
+ConstConfigRcPtr *OCIO_getCurrentConfig(void);
+void OCIO_setCurrentConfig(const ConstConfigRcPtr *config);
+
+ConstConfigRcPtr *OCIO_configCreateFromEnv(void);
+ConstConfigRcPtr *OCIO_configCreateFromFile(const char* filename);
+
+void OCIO_configRelease(ConstConfigRcPtr *config);
+
+int OCIO_configGetNumColorSpaces(ConstConfigRcPtr *config);
+const char *OCIO_configGetColorSpaceNameByIndex(ConstConfigRcPtr *config, int index);
+ConstColorSpaceRcPtr *OCIO_configGetColorSpace(ConstConfigRcPtr *config, const char *name);
+int OCIO_configGetIndexForColorSpace(ConstConfigRcPtr *config, const char *name);
+
+int OCIO_colorSpaceIsInvertible(ConstColorSpaceRcPtr *cs);
+
+void OCIO_colorSpaceRelease(ConstColorSpaceRcPtr *cs);
+
+const char *OCIO_configGetDefaultDisplay(ConstConfigRcPtr *config);
+int         OCIO_configGetNumDisplays(ConstConfigRcPtr *config);
+const char *OCIO_configGetDisplay(ConstConfigRcPtr *config, int index);
+const char *OCIO_configGetDefaultView(ConstConfigRcPtr *config, const char *display);
+int         OCIO_configGetNumViews(ConstConfigRcPtr *config, const char *display);
+const char *OCIO_configGetView(ConstConfigRcPtr *config, const char *display, int index);
+const char *OCIO_configGetDisplayColorSpaceName(ConstConfigRcPtr *config, const char *display, const char *view);
+
+ConstProcessorRcPtr *OCIO_configGetProcessorWithNames(ConstConfigRcPtr *config, const char *srcName, const char *dstName);
+ConstProcessorRcPtr *OCIO_configGetProcessor(ConstConfigRcPtr *config, ConstTransformRcPtr *transform);
+
+void OCIO_processorApply(ConstProcessorRcPtr *processor, PackedImageDesc *img);
+void OCIO_processorApply_predivide(ConstProcessorRcPtr *processor, PackedImageDesc *img);
+void OCIO_processorApplyRGB(ConstProcessorRcPtr *processor, float *pixel);
+void OCIO_processorApplyRGBA(ConstProcessorRcPtr *processor, float *pixel);
+void OCIO_processorApplyRGBA_predivide(ConstProcessorRcPtr *processor, float *pixel);
+
+void OCIO_processorRelease(ConstProcessorRcPtr *p);
+
+const char *OCIO_colorSpaceGetName(ConstColorSpaceRcPtr *cs);
+const char *OCIO_colorSpaceGetDescription(ConstColorSpaceRcPtr *cs);
+const char *OCIO_colorSpaceGetFamily(ConstColorSpaceRcPtr *cs);
+
+DisplayTransformRcPtr *OCIO_createDisplayTransform(void);
+void OCIO_displayTransformSetInputColorSpaceName(DisplayTransformRcPtr *dt, const char *name);
+void OCIO_displayTransformSetDisplay(DisplayTransformRcPtr *dt, const char *name);
+void OCIO_displayTransformSetView(DisplayTransformRcPtr *dt, const char *name);
+void OCIO_displayTransformSetDisplayCC(DisplayTransformRcPtr *dt, ConstTransformRcPtr *et);
+void OCIO_displayTransformSetLinearCC(DisplayTransformRcPtr *dt, ConstTransformRcPtr *et);
+void OCIO_displayTransformRelease(DisplayTransformRcPtr *dt);
+
+PackedImageDesc *OCIO_createPackedImageDesc(float *data, long width, long height, long numChannels,
+                                            long chanStrideBytes, long xStrideBytes, long yStrideBytes);
+
+void OCIO_packedImageDescRelease(PackedImageDesc *p);
+
+ExponentTransformRcPtr *OCIO_createExponentTransform(void);
+void OCIO_exponentTransformSetValue(ExponentTransformRcPtr *et, const float *exponent);
+void OCIO_exponentTransformRelease(ExponentTransformRcPtr *et);
+
+MatrixTransformRcPtr *OCIO_createMatrixTransform(void);
+void OCIO_matrixTransformSetValue(MatrixTransformRcPtr *et, const float *m44, const float *offset4);
+void OCIO_matrixTransformRelease(MatrixTransformRcPtr *mt);
+
+void OCIO_matrixTransformScale(float * m44, float * offset4, const float * scale4);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif //OCIO_CAPI_H
diff --git a/intern/opencolorio/ocio_capi_stub.cpp b/intern/opencolorio/ocio_capi_stub.cpp
new file mode 100644
index 00000000000..a601cd3be91
--- /dev/null
+++ b/intern/opencolorio/ocio_capi_stub.cpp
@@ -0,0 +1,380 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * 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.
+ *
+ * The Original Code is Copyright (C) 2012 Blender Foundation.
+ * All rights reserved.
+ *
+ * Contributor(s): Brecht van Lommel
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#include <string.h>
+
+#include "MEM_guardedalloc.h"
+#include "BLI_math_color.h"
+
+namespace OCIO_NAMESPACE {};
+
+#include "ocio_capi.h"
+
+#define CONFIG_DEFAULT           ((ConstConfigRcPtr*)1)
+
+#define PROCESSOR_LINEAR_TO_SRGB ((ConstProcessorRcPtr*)1)
+#define PROCESSOR_SRGB_TO_LINEAR ((ConstProcessorRcPtr*)2)
+#define PROCESSOR_UNKNOWN        ((ConstProcessorRcPtr*)3)
+
+#define COLORSPACE_LINEAR        ((ConstColorSpaceRcPtr*)1)
+#define COLORSPACE_SRGB          ((ConstColorSpaceRcPtr*)2)
+
+typedef struct PackedImageDescription {
+	float *data;
+	long width;
+	long height;
+	long numChannels;
+	long chanStrideBytes;
+	long xStrideBytes;
+	long yStrideBytes;
+} PackedImageDescription;
+
+ConstConfigRcPtr *OCIO_getCurrentConfig(void)
+{
+	return CONFIG_DEFAULT;
+}
+
+void OCIO_setCurrentConfig(const ConstConfigRcPtr *)
+{
+}
+
+ConstConfigRcPtr *OCIO_configCreateFromEnv(void)
+{
+	return CONFIG_DEFAULT;
+}
+
+ConstConfigRcPtr *OCIO_configCreateFromFile(const char *)
+{
+	return CONFIG_DEFAULT;
+}
+
+void OCIO_configRelease(ConstConfigRcPtr *)
+{
+}
+
+int OCIO_configGetNumColorSpaces(ConstConfigRcPtr *)
+{
+	return 2;
+}
+
+const char *OCIO_configGetColorSpaceNameByIndex(ConstConfigRcPtr *, int index)
+{
+	if (index == 0)
+		return "Linear";
+	else if (index == 1)
+		return "sRGB";
+	
+	return NULL;
+}
+
+ConstColorSpaceRcPtr *OCIO_configGetColorSpace(ConstConfigRcPtr *, const char *name)
+{
+	if (strcmp(name, "scene_linear") == 0)
+		return COLORSPACE_LINEAR;
+	else if (strcmp(name, "color_picking") == 0)
+		return COLORSPACE_SRGB;
+	else if (strcmp(name, "texture_paint") == 0)
+		return COLORSPACE_LINEAR;
+	else if (strcmp(name, "default_byte") == 0)
+		return COLORSPACE_SRGB;
+	else if (strcmp(name, "default_float") == 0)
+		return COLORSPACE_LINEAR;
+	else if (strcmp(name, "default_sequencer") == 0)
+		return COLORSPACE_SRGB;
+	else if (strcmp(name, "Linear") == 0)
+		return COLORSPACE_LINEAR;
+	else if (strcmp(name, "sRGB") == 0)
+		return COLORSPACE_SRGB;
+
+	return NULL;
+}
+
+int OCIO_configGetIndexForColorSpace(ConstConfigRcPtr *config, const char *name)
+{
+	ConstColorSpaceRcPtr *cs = OCIO_configGetColorSpace(config, name);
+
+	if (cs == COLORSPACE_LINEAR)
+		return 0;
+	else if (cs == COLORSPACE_SRGB)
+		return 1;
+
+	return -1;
+}
+
+const char *OCIO_configGetDefaultDisplay(ConstConfigRcPtr *)
+{
+	return "sRGB";
+}
+
+int OCIO_configGetNumDisplays(ConstConfigRcPtr* config)
+{
+	return 1;
+}
+
+const char *OCIO_configGetDisplay(ConstConfigRcPtr *, int index)
+{
+	if (index == 0)
+		return "sRGB";
+	
+	return NULL;
+}
+
+const char *OCIO_configGetDefaultView(ConstConfigRcPtr *, const char *)
+{
+	return "Default";
+}
+
+int OCIO_configGetNumViews(ConstConfigRcPtr *, const char *)
+{
+	return 1;
+}
+
+const char *OCIO_configGetView(ConstConfigRcPtr *, const char *, int index)
+{
+	if (index == 0)
+		return "Default";
+
+	return NULL;
+}
+
+const char *OCIO_configGetDisplayColorSpaceName(ConstConfigRcPtr *, const char *, const char *)
+{
+	return "sRGB";
+}
+
+int OCIO_colorSpaceIsInvertible(ConstColorSpaceRcPtr *cs)
+{
+	return 1;
+}
+
+void OCIO_colorSpaceRelease(ConstColorSpaceRcPtr *cs)
+{
+}
+
+ConstProcessorRcPtr *OCIO_configGetProcessorWithNames(ConstConfigRcPtr *config, const char *srcName, const char *dstName)
+{
+	ConstColorSpaceRcPtr *cs_src = OCIO_configGetColorSpace(config, srcName);
+	ConstColorSpaceRcPtr *cs_dst = OCIO_configGetColorSpace(config, dstName);
+
+	if (cs_src == COLORSPACE_LINEAR && cs_dst == COLORSPACE_SRGB)
+		return PROCESSOR_LINEAR_TO_SRGB;
+	else if (cs_src == COLORSPACE_SRGB && cs_dst == COLORSPACE_LINEAR)
+		return PROCESSOR_SRGB_TO_LINEAR;
+
+	return 0;
+}
+
+ConstProcessorRcPtr *OCIO_configGetProcessor(ConstConfigRcPtr *, ConstTransformRcPtr *tfm)
+{
+	return (ConstProcessorRcPtr*)tfm;
+}
+
+void OCIO_processorApply(ConstProcessorRcPtr *processor, PackedImageDesc *img)
+{
+	/* OCIO_TODO stride not respected, channels must be 3 or 4 */
+	PackedImageDescription *desc = (PackedImageDescription*)img;
+	int channels = desc->numChannels;
+	float *pixels = desc->data;
+	int width = desc->width;
+	int height = desc->height;
+	int x, y;
+
+	for (y = 0; y < height; y++) {
+		for (x = 0; x < width; x++) {
+			float *pixel = pixels + channels * (y * width + x);
+
+			if (channels == 4)
+				OCIO_processorApplyRGBA(processor, pixel);
+			else if (channels == 3)
+				OCIO_processorApplyRGB(processor, pixel);
+		}
+	}
+}
+
+void OCIO_processorApply_predivide(ConstProcessorRcPtr *processor, PackedImageDesc *img)
+{
+	/* OCIO_TODO stride not respected, channels must be 3 or 4 */
+	PackedImageDescription *desc = (PackedImageDescription*)img;
+	int channels = desc->numChannels;
+	float *pixels = desc->data;
+	int width = desc->width;
+	int height = desc->height;
+	int x, y;
+
+	for (y = 0; y < height; y++) {
+		for (x = 0; x < width; x++) {
+			float *pixel = pixels + channels * (y * width + x);
+
+			if (channels == 4)
+				OCIO_processorApplyRGBA_predivide(processor, pixel);
+			else if (channels == 3)
+				OCIO_processorApplyRGB(processor, pixel);
+		}
+	}
+}
+
+void OCIO_processorApplyRGB(ConstProcessorRcPtr *processor, float *pixel)
+{
+	if (processor == PROCESSOR_LINEAR_TO_SRGB)
+		linearrgb_to_srgb_v3_v3(pixel, pixel);
+	else if (processor == PROCESSOR_SRGB_TO_LINEAR)
+		srgb_to_linearrgb_v3_v3(pixel, pixel);
+}
+
+void OCIO_processorApplyRGBA(ConstProcessorRcPtr *processor, float *pixel)
+{
+	if (processor == PROCESSOR_LINEAR_TO_SRGB)
+		linearrgb_to_srgb_v4(pixel, pixel);
+	else if (processor == PROCESSOR_SRGB_TO_LINEAR)
+		srgb_to_linearrgb_v4(pixel, pixel);
+}
+
+void OCIO_processorApplyRGBA_predivide(ConstProcessorRcPtr *processor, float *pixel)
+{
+	if (pixel[3] == 1.0f || pixel[3] == 0.0f) {
+		OCIO_processorApplyRGBA(processor, pixel);
+	}
+	else {
+		float alpha, inv_alpha;
+
+		alpha = pixel[3];
+		inv_alpha = 1.0f / alpha;
+
+		pixel[0] *= inv_alpha;
+		pixel[1] *= inv_alpha;
+		pixel[2] *= inv_alpha;
+
+		OCIO_processorApplyRGBA(processor, pixel);
+
+		pixel[0] *= alpha;
+		pixel[1] *= alpha;
+		pixel[2] *= alpha;
+	}
+}
+
+void OCIO_processorRelease(ConstProcessorRcPtr *)
+{
+}
+
+const char *OCIO_colorSpaceGetName(ConstColorSpaceRcPtr *cs)
+{
+	if (cs == COLORSPACE_LINEAR)
+		return "Linear";
+	else if (cs == COLORSPACE_SRGB)
+		return "sRGB";
+	
+	return NULL;
+}
+
+const char *OCIO_colorSpaceGetDescription(ConstColorSpaceRcPtr *)
+{
+	return "";
+}
+
+const char *OCIO_colorSpaceGetFamily(ConstColorSpaceRcPtr *)
+{
+	return "";
+}
+
+DisplayTransformRcPtr *OCIO_createDisplayTransform(void)
+{
+	return (DisplayTransformRcPtr*)PROCESSOR_LINEAR_TO_SRGB;
+}
+
+void OCIO_displayTransformSetInputColorSpaceName(DisplayTransformRcPtr *, const char *)
+{
+}
+
+void OCIO_displayTransformSetDisplay(DisplayTransformRcPtr *, const char *)
+{
+}
+
+void OCIO_displayTransformSetView(DisplayTransformRcPtr *, const char *)
+{
+}
+
+void OCIO_displayTransformSetDisplayCC(DisplayTransformRcPtr *, ConstTransformRcPtr *)
+{
+}
+
+void OCIO_displayTransformSetLinearCC(DisplayTransformRcPtr *, ConstTransformRcPtr *)
+{
+}
+
+void OCIO_displayTransformRelease(DisplayTransformRcPtr *)
+{
+}
+
+PackedImageDesc *OCIO_createPackedImageDesc(float *data, long width, long height, long numChannels,
+                                            long chanStrideBytes, long xStrideBytes, long yStrideBytes)
+{
+	PackedImageDescription *desc = (PackedImageDescription*)MEM_callocN(sizeof(PackedImageDescription), "PackedImageDescription");
+
+	desc->data = data;
+	desc->width = width;
+	desc->height = height;
+	desc->numChannels = numChannels;
+	desc->chanStrideBytes = chanStrideBytes;
+	desc->xStrideBytes = xStrideBytes;
+	desc->yStrideBytes = yStrideBytes;
+
+	return (PackedImageDesc*)desc;
+}
+
+void OCIO_packedImageDescRelease(PackedImageDesc* id)
+{
+	MEM_freeN(id);
+}
+
+ExponentTransformRcPtr *OCIO_createExponentTransform(void)
+{
+	return (ExponentTransformRcPtr*)PROCESSOR_UNKNOWN;
+}
+
+void OCIO_exponentTransformSetValue(ExponentTransformRcPtr *, const float *)
+{
+}
+
+void OCIO_exponentTransformRelease(ExponentTransformRcPtr *)
+{
+}
+
+MatrixTransformRcPtr *OCIO_createMatrixTransform(void)
+{
+	return (MatrixTransformRcPtr*)PROCESSOR_UNKNOWN;
+}
+
+void OCIO_matrixTransformSetValue(MatrixTransformRcPtr *, const float *, const float *)
+{
+}
+
+void OCIO_matrixTransformRelease(MatrixTransformRcPtr *)
+{
+}
+
+void OCIO_matrixTransformScale(float * , float * , const float *)
+{
+}
+