Color Management, Stage 2: Switch color pipeline to use OpenColorIO

Replace old color pipeline which was supporting linear/sRGB color spaces
only with OpenColorIO-based pipeline.

This introduces two configurable color spaces:

- Input color space for images and movie clips. This space is used to convert
  images/movies from color space in which file is saved to Blender's linear
  space (for float images, byte images are not internally converted, only input
  space is stored for such images and used later).

  This setting could be found in image/clip data block settings.

- Display color space which defines space in which particular display is working.

  This settings could be found in scene's Color Management panel.

When render result is being displayed on the screen, apart from converting image
to display space, some additional conversions could happen.

This conversions are:

- View, which defines tone curve applying before display transformation.
  These are different ways to view the image on the same display device.
  For example it could be used to emulate film view on sRGB display.

- Exposure affects on image exposure before tone map is applied.

- Gamma is post-display gamma correction, could be used to match particular
  display gamma.

- RGB curves are user-defined curves which are applying before display
  transformation, could be used for different purposes.

All this settings by default are only applying on render result and does not
affect on other images. If some particular image needs to be affected by this
transformation, "View as Render" setting of image data block should be set to
truth. Movie clips are always affected by all display transformations.

This commit also introduces configurable color space in which sequencer is
working. This setting could be found in scene's Color Management panel and
it should be used if such stuff as grading needs to be done in color space
different from sRGB (i.e. when Film view on sRGB display is use, using VD16
space as sequencer's internal space would make grading working in space
which is close to the space using for display).

Some technical notes:

- Image buffer's float buffer is now always in linear space, even if it was
  created from 16bit byte images.

- Space of byte buffer is stored in image buffer's rect_colorspace property.

- Profile of image buffer was removed since it's not longer meaningful.

- OpenGL and GLSL is supposed to always work in sRGB space. It is possible
  to support other spaces, but it's quite large project which isn't so
  much important.

- Legacy Color Management option disabled is emulated by using None display.
  It could have some regressions, but there's no clear way to avoid them.

- If OpenColorIO is disabled on build time, it should make blender behaving
  in the same way as previous release with color management enabled.

More details could be found at this page (more details would be added soon):
http://wiki.blender.org/index.php/Dev:Ref/Release_Notes/2.64/Color_Management

--
Thanks to Xavier Thomas, Lukas Toene for initial work on OpenColorIO
integration and to Brecht van Lommel for some further development and code/
usecase review!

1 files changed, 239 insertions, 3 deletions

diff --git a/source/blender/makesrna/intern/rna_color.c b/source/blender/makesrna/intern/rna_color.c
index 0bd42c2f5a0..0edcad59577 100644
--- a/source/blender/makesrna/intern/rna_color.c
+++ b/source/blender/makesrna/intern/rna_color.c
@@ -34,25 +34,31 @@
 #include "DNA_color_types.h"
 #include "DNA_texture_types.h"
 
+#include "WM_api.h"
+#include "WM_types.h"
+
 #ifdef RNA_RUNTIME
 
 #include "RNA_access.h"
 
+#include "DNA_image_types.h"
 #include "DNA_material_types.h"
+#include "DNA_movieclip_types.h"
 #include "DNA_node_types.h"
 
 #include "MEM_guardedalloc.h"
 
 #include "BKE_colortools.h"
 #include "BKE_depsgraph.h"
+#include "BKE_image.h"
+#include "BKE_movieclip.h"
 #include "BKE_node.h"
 #include "BKE_texture.h"
 
-#include "WM_api.h"
-#include "WM_types.h"
-
 #include "ED_node.h"
 
+#include "IMB_colormanagement.h"
+
 static int rna_CurveMapping_curves_length(PointerRNA *ptr)
 {
 	CurveMapping *cumap = (CurveMapping *)ptr->data;
@@ -337,6 +343,154 @@ static void rna_Scopes_update(Main *UNUSED(bmain), Scene *UNUSED(scene), Pointer
 	s->ok = 0;
 }
 
+static int rna_ColorManagedDisplaySettings_display_device_get(struct PointerRNA *ptr)
+{
+	ColorManagedDisplaySettings *display = (ColorManagedDisplaySettings *) ptr->data;
+
+	return IMB_colormanagement_display_get_named_index(display->display_device);
+}
+
+static void rna_ColorManagedDisplaySettings_display_device_set(struct PointerRNA *ptr, int value)
+{
+	ColorManagedDisplaySettings *display = (ColorManagedDisplaySettings *) ptr->data;
+	const char *name = IMB_colormanagement_display_get_indexed_name(value);
+
+	if (name) {
+		BLI_strncpy(display->display_device, name, sizeof(display->display_device));
+	}
+}
+
+static EnumPropertyItem *rna_ColorManagedDisplaySettings_display_device_itemf(bContext *C, PointerRNA *ptr, PropertyRNA *UNUSED(prop), int *free)
+{
+	EnumPropertyItem *items = NULL;
+	int totitem = 0;
+
+	IMB_colormanagement_display_items_add(&items, &totitem);
+	RNA_enum_item_end(&items, &totitem);
+
+	*free = TRUE;
+
+	return items;
+}
+
+static void rna_ColorManagedDisplaySettings_display_device_update(Main *UNUSED(bmain), Scene *UNUSED(scene), PointerRNA *ptr)
+{
+	ID *id = ptr->id.data;
+
+	if (GS(id->name) == ID_SCE) {
+		Scene *scene = (Scene *) id;
+
+		IMB_colormanagement_validate_settings(&scene->display_settings, &scene->view_settings);
+
+		WM_main_add_notifier(NC_SCENE | ND_SEQUENCER, NULL);
+	}
+}
+
+static int rna_ColorManagedViewSettings_view_transform_get(PointerRNA *ptr)
+{
+	ColorManagedViewSettings *view = (ColorManagedViewSettings *) ptr->data;
+
+	return IMB_colormanagement_view_get_named_index(view->view_transform);
+}
+
+static void rna_ColorManagedViewSettings_view_transform_set(PointerRNA *ptr, int value)
+{
+	ColorManagedViewSettings *view = (ColorManagedViewSettings *) ptr->data;
+
+	const char *name = IMB_colormanagement_view_get_indexed_name(value);
+
+	if (name) {
+		BLI_strncpy(view->view_transform, name, sizeof(view->view_transform));
+	}
+}
+
+static EnumPropertyItem* rna_ColorManagedViewSettings_view_transform_itemf(bContext *C, PointerRNA *ptr, PropertyRNA *UNUSED(prop), int *free)
+{
+	Scene *scene = CTX_data_scene(C);
+	EnumPropertyItem *items = NULL;
+	ColorManagedDisplaySettings *display_settings = &scene->display_settings;
+	int totitem = 0;
+
+	IMB_colormanagement_view_items_add(&items, &totitem, display_settings->display_device);
+	RNA_enum_item_end(&items, &totitem);
+
+	*free = TRUE;
+	return items;
+}
+
+static void rna_ColorManagedViewSettings_use_curves_set(PointerRNA *ptr, int value)
+{
+	ColorManagedViewSettings *view_settings = (ColorManagedViewSettings *) ptr->data;
+
+	if (value) {
+		view_settings->flag |= COLORMANAGE_VIEW_USE_CURVES;
+
+		if (view_settings->curve_mapping == NULL) {
+			view_settings->curve_mapping = curvemapping_add(4, 0.0f, 0.0f, 1.0f, 1.0f);
+		}
+	}
+	else {
+		view_settings->flag &= ~COLORMANAGE_VIEW_USE_CURVES;
+	}
+}
+
+static int rna_ColorManagedColorspaceSettings_colorspace_get(struct PointerRNA *ptr)
+{
+	ColorManagedColorspaceSettings *colorspace = (ColorManagedColorspaceSettings *) ptr->data;
+
+	return IMB_colormanagement_colorspace_get_named_index(colorspace->name);
+}
+
+static void rna_ColorManagedColorspaceSettings_colorspace_set(struct PointerRNA *ptr, int value)
+{
+	ColorManagedColorspaceSettings *colorspace = (ColorManagedColorspaceSettings *) ptr->data;
+	const char *name = IMB_colormanagement_colorspace_get_indexed_name(value);
+
+	if (name) {
+		BLI_strncpy(colorspace->name, name, sizeof(colorspace->name));
+	}
+}
+
+static EnumPropertyItem *rna_ColorManagedColorspaceSettings_colorspace_itemf(bContext *C, PointerRNA *ptr, PropertyRNA *UNUSED(prop), int *free)
+{
+	EnumPropertyItem *items = NULL;
+	int totitem = 0;
+
+	IMB_colormanagement_colorspace_items_add(&items, &totitem);
+	RNA_enum_item_end(&items, &totitem);
+
+	*free = TRUE;
+
+	return items;
+}
+
+static void rna_ColorManagedColorspaceSettings_reload_update(Main *UNUSED(bmain), Scene *UNUSED(scene), PointerRNA *ptr)
+{
+	ID *id = ptr->id.data;
+
+	if (GS(id->name) == ID_IM) {
+		Image *ima = (Image *) id;
+
+		BKE_image_signal(ima, NULL, IMA_SIGNAL_RELOAD);
+		WM_main_add_notifier(NC_IMAGE | ND_DISPLAY, &ima->id);
+	}
+	else if (GS(id->name) == ID_MC) {
+		MovieClip *clip = (MovieClip *) id;
+
+		BKE_movieclip_reload(clip);
+		WM_main_add_notifier(NC_MOVIECLIP | ND_DISPLAY, &clip->id);
+	}
+}
+
+static void rna_ColorManagement_update(Main *UNUSED(bmain), Scene *UNUSED(scene), PointerRNA *ptr)
+{
+	ID *id = ptr->id.data;
+
+	if (GS(id->name) == ID_SCE) {
+		WM_main_add_notifier(NC_SCENE | ND_SEQUENCER, NULL);
+	}
+}
+
 /* this function only exists because #curvemap_evaluateF uses a 'const' qualifier */
 float rna_CurveMap_evaluateF(struct CurveMap *cuma, float value)
 {
@@ -682,6 +836,87 @@ static void rna_def_scopes(BlenderRNA *brna)
 	RNA_def_property_ui_text(prop, "Vectorscope Opacity", "Opacity of the points");
 }
 
+static void rna_def_colormanage(BlenderRNA *brna)
+{
+	StructRNA *srna;
+	PropertyRNA *prop;
+
+	static EnumPropertyItem display_device_items[] = {
+		{0, "DEFAULT", 0, "Default", ""},
+		{0, NULL, 0, NULL, NULL}
+	};
+
+	static EnumPropertyItem view_transform_items[] = {
+		{0, "NONE", 0, "None", "Do not perform any color transform on display, use old non-color managed technique for display"},
+		{0, NULL, 0, NULL, NULL}
+	};
+
+	static EnumPropertyItem color_space_items[] = {
+		{0, "NONE", 0, "None", "Do not perform any color transform on load, treat colors as in scene linear space already"},
+		{0, NULL, 0, NULL, NULL}
+	};
+
+	/* ** Display Settings  **  */
+	srna = RNA_def_struct(brna, "ColorManagedDisplaySettings", NULL);
+	RNA_def_struct_ui_text(srna, "ColorManagedDisplaySettings", "Color management specific to display device");
+
+	prop= RNA_def_property(srna, "display_device", PROP_ENUM, PROP_NONE);
+	RNA_def_property_enum_items(prop, display_device_items);
+	RNA_def_property_enum_funcs(prop, "rna_ColorManagedDisplaySettings_display_device_get",
+	                                  "rna_ColorManagedDisplaySettings_display_device_set",
+	                                  "rna_ColorManagedDisplaySettings_display_device_itemf");
+	RNA_def_property_ui_text(prop, "Display Device", "Display device name");
+	RNA_def_property_update(prop, NC_WINDOW, "rna_ColorManagedDisplaySettings_display_device_update");
+
+	/* ** View Settings  **  */
+	srna = RNA_def_struct(brna, "ColorManagedViewSettings", NULL);
+	RNA_def_struct_ui_text(srna, "ColorManagedViewSettings", "Color management settings used for displaying images on the display");
+
+	prop= RNA_def_property(srna, "view_transform", PROP_ENUM, PROP_NONE);
+	RNA_def_property_enum_items(prop, view_transform_items);
+	RNA_def_property_enum_funcs(prop, "rna_ColorManagedViewSettings_view_transform_get",
+	                                  "rna_ColorManagedViewSettings_view_transform_set",
+	                                  "rna_ColorManagedViewSettings_view_transform_itemf");
+	RNA_def_property_ui_text(prop, "View Transform", "View used ");
+	RNA_def_property_update(prop, NC_WINDOW, "rna_ColorManagement_update");
+
+	prop = RNA_def_property(srna, "exposure", PROP_FLOAT, PROP_FACTOR);
+	RNA_def_property_float_sdna(prop, NULL, "exposure");
+	RNA_def_property_range(prop, -10.0f, 10.0f);
+	RNA_def_property_float_default(prop, 0.0f);
+	RNA_def_property_ui_text(prop, "Exposure", "Exposure (stops) applied before display transform");
+	RNA_def_property_update(prop, NC_WINDOW, "rna_ColorManagement_update");
+
+	prop = RNA_def_property(srna, "gamma", PROP_FLOAT, PROP_FACTOR);
+	RNA_def_property_float_sdna(prop, NULL, "gamma");
+	RNA_def_property_float_default(prop, 1.0f);
+	RNA_def_property_range(prop, 0.0f, 5.0f);
+	RNA_def_property_ui_text(prop, "Gamma", "Amount of gamma modification applied after display transform");
+	RNA_def_property_update(prop, NC_WINDOW, "rna_ColorManagement_update");
+
+	prop = RNA_def_property(srna, "curve_mapping", PROP_POINTER, PROP_NONE);
+	RNA_def_property_pointer_sdna(prop, NULL, "curve_mapping");
+	RNA_def_property_ui_text(prop, "Curve", "Color curve mapping applied before display transform");
+	RNA_def_property_update(prop, NC_WINDOW, "rna_ColorManagement_update");
+
+	prop = RNA_def_property(srna, "use_curve_mapping", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_sdna(prop, NULL, "flag", COLORMANAGE_VIEW_USE_CURVES);
+	RNA_def_property_boolean_funcs(prop, NULL, "rna_ColorManagedViewSettings_use_curves_set");
+	RNA_def_property_ui_text(prop, "Use Curves", "Use RGB curved for pre-display transformation");
+	RNA_def_property_update(prop, NC_WINDOW, "rna_ColorManagement_update");
+
+	/* ** Colorspace **  */
+	srna = RNA_def_struct(brna, "ColorManagedColorspaceSettings", NULL);
+	RNA_def_struct_ui_text(srna, "ColorManagedColorspaceSettings", "Input color space settings");
+
+	prop= RNA_def_property(srna, "name", PROP_ENUM, PROP_NONE);
+	RNA_def_property_enum_items(prop, color_space_items);
+	RNA_def_property_enum_funcs(prop, "rna_ColorManagedColorspaceSettings_colorspace_get",
+	                                  "rna_ColorManagedColorspaceSettings_colorspace_set",
+	                                  "rna_ColorManagedColorspaceSettings_colorspace_itemf");
+	RNA_def_property_ui_text(prop, "Color Space", "Input color space name");
+	RNA_def_property_update(prop, NC_WINDOW, "rna_ColorManagedColorspaceSettings_reload_update");
+}
 
 void RNA_def_color(BlenderRNA *brna)
 {
@@ -692,6 +927,7 @@ void RNA_def_color(BlenderRNA *brna)
 	rna_def_color_ramp(brna);
 	rna_def_histogram(brna);
 	rna_def_scopes(brna);
+	rna_def_colormanage(brna);
 }
 
 #endif