blender-archive/source/blender/blenkernel/intern/context.c

/*
 * ***** 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.
 *
 * Contributor(s): Blender Foundation (2008).
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file blender/blenkernel/intern/context.c
 *  \ingroup bke
 */

#include <string.h>
#include <stdlib.h>
#include <stddef.h>

#include "MEM_guardedalloc.h"

#include "DNA_group_types.h"
#include "DNA_scene_types.h"
#include "DNA_screen_types.h"
#include "DNA_space_types.h"
#include "DNA_view3d_types.h"
#include "DNA_windowmanager_types.h"
#include "DNA_object_types.h"
#include "DNA_linestyle_types.h"
#include "DNA_gpencil_types.h"
#include "DNA_workspace_types.h"

#include "DEG_depsgraph.h"

#include "BLI_listbase.h"
#include "BLI_string.h"
#include "BLI_threads.h"
#include "BLI_utildefines.h"

#include "BLT_translation.h"

#include "BKE_context.h"
#include "BKE_layer.h"
#include "BKE_main.h"
#include "BKE_scene.h"
#include "BKE_screen.h"
#include "BKE_sound.h"
#include "BKE_workspace.h"

#include "RE_engine.h"

#include "RNA_access.h"

#ifdef WITH_PYTHON
#  include "BPY_extern.h"
#endif

/* struct */

struct bContext {
	int thread;

	/* windowmanager context */
	struct {
		struct wmWindowManager *manager;
		struct wmWindow *window;
		struct WorkSpace *workspace;
		struct bScreen *screen;
		struct ScrArea *area;
		struct ARegion *region;
		struct ARegion *menu;
		struct wmManipulatorGroup *manipulator_group;
		struct bContextStore *store;
		const char *operator_poll_msg; /* reason for poll failing */
	} wm;
	
	/* data context */
	struct {
		struct Main *main;
		struct Scene *scene;

		int recursion;
		int py_init; /* true if python is initialized */
		void *py_context;
	} data;
	
	/* data evaluation */
#if 0
	struct {
		int render;
	} eval;
#endif
};

/* context */

bContext *CTX_create(void)
{
	bContext *C;
	
	C = MEM_callocN(sizeof(bContext), "bContext");

	return C;
}

bContext *CTX_copy(const bContext *C)
{
	bContext *newC = MEM_dupallocN((void *)C);

	return newC;
}

void CTX_free(bContext *C)
{
	MEM_freeN(C);
}

/* store */

bContextStore *CTX_store_add(ListBase *contexts, const char *name, PointerRNA *ptr)
{
	bContextStoreEntry *entry;
	bContextStore *ctx, *lastctx;

	/* ensure we have a context to put the entry in, if it was already used
	 * we have to copy the context to ensure */
	ctx = contexts->last;

	if (!ctx || ctx->used) {
		if (ctx) {
			lastctx = ctx;
			ctx = MEM_dupallocN(lastctx);
			BLI_duplicatelist(&ctx->entries, &lastctx->entries);
		}
		else
			ctx = MEM_callocN(sizeof(bContextStore), "bContextStore");

		BLI_addtail(contexts, ctx);
	}

	entry = MEM_callocN(sizeof(bContextStoreEntry), "bContextStoreEntry");
	BLI_strncpy(entry->name, name, sizeof(entry->name));
	entry->ptr = *ptr;

	BLI_addtail(&ctx->entries, entry);

	return ctx;
}

bContextStore *CTX_store_add_all(ListBase *contexts, bContextStore *context)
{
	bContextStoreEntry *entry, *tentry;
	bContextStore *ctx, *lastctx;

	/* ensure we have a context to put the entries in, if it was already used
	 * we have to copy the context to ensure */
	ctx = contexts->last;

	if (!ctx || ctx->used) {
		if (ctx) {
			lastctx = ctx;
			ctx = MEM_dupallocN(lastctx);
			BLI_duplicatelist(&ctx->entries, &lastctx->entries);
		}
		else
			ctx = MEM_callocN(sizeof(bContextStore), "bContextStore");

		BLI_addtail(contexts, ctx);
	}

	for (tentry = context->entries.first; tentry; tentry = tentry->next) {
		entry = MEM_dupallocN(tentry);
		BLI_addtail(&ctx->entries, entry);
	}

	return ctx;
}

void CTX_store_set(bContext *C, bContextStore *store)
{
	C->wm.store = store;
}

bContextStore *CTX_store_copy(bContextStore *store)
{
	bContextStore *ctx;

	ctx = MEM_dupallocN(store);
	BLI_duplicatelist(&ctx->entries, &store->entries);

	return ctx;
}

void CTX_store_free(bContextStore *store)
{
	BLI_freelistN(&store->entries);
	MEM_freeN(store);
}

void CTX_store_free_list(ListBase *contexts)
{
	bContextStore *ctx;

	while ((ctx = BLI_pophead(contexts))) {
		CTX_store_free(ctx);
	}
}

/* is python initialied? */

int CTX_py_init_get(bContext *C)
{
	return C->data.py_init;
}
void CTX_py_init_set(bContext *C, int value)
{
	C->data.py_init = value;
}

void *CTX_py_dict_get(const bContext *C)
{
	return C->data.py_context;
}
void CTX_py_dict_set(bContext *C, void *value)
{
	C->data.py_context = value;
}

/* data context utility functions */

struct bContextDataResult {
	PointerRNA ptr;
	ListBase list;
	const char **dir;
	short type; /* 0: normal, 1: seq */
};

static void *ctx_wm_python_context_get(
        const bContext *C,
        const char *member, const StructRNA *member_type,
        void *fall_through)
{
#ifdef WITH_PYTHON
	if (UNLIKELY(C && CTX_py_dict_get(C))) {
		bContextDataResult result;
		memset(&result, 0, sizeof(bContextDataResult));
		BPY_context_member_get((bContext *)C, member, &result);

		if (result.ptr.data) {
			if (RNA_struct_is_a(result.ptr.type, member_type)) {
				return result.ptr.data;
			}
			else {
				printf("PyContext '%s' is a '%s', expected a '%s'\n",
				       member,
				       RNA_struct_identifier(result.ptr.type),
				       RNA_struct_identifier(member_type));
			}
		}
	}
#else
	UNUSED_VARS(C, member, member_type);
#endif

	/* don't allow UI context access from non-main threads */
	if (!BLI_thread_is_main())
		return NULL;

	return fall_through;
}

static int ctx_data_get(bContext *C, const char *member, bContextDataResult *result)
{
	bScreen *sc;
	ScrArea *sa;
	ARegion *ar;
	int done = 0, recursion = C->data.recursion;
	int ret = 0;

	memset(result, 0, sizeof(bContextDataResult));
#ifdef WITH_PYTHON
	if (CTX_py_dict_get(C)) {
		if (BPY_context_member_get(C, member, result)) {
			return 1;
		}
	}
#endif

	/* don't allow UI context access from non-main threads */
	if (!BLI_thread_is_main())
		return done;

	/* we check recursion to ensure that we do not get infinite
	 * loops requesting data from ourselves in a context callback */

	/* Ok, this looks evil...
	 * if (ret) done = -(-ret | -done);
	 *
	 * Values in order of importance
	 * (0, -1, 1) - Where 1 is highest priority
	 * */
	if (done != 1 && recursion < 1 && C->wm.store) {
		bContextStoreEntry *entry;

		C->data.recursion = 1;

		entry = BLI_rfindstring(&C->wm.store->entries, member, offsetof(bContextStoreEntry, name));
		if (entry) {
			result->ptr = entry->ptr;
			done = 1;
		}
	}
	if (done != 1 && recursion < 2 && (ar = CTX_wm_region(C))) {
		C->data.recursion = 2;
		if (ar->type && ar->type->context) {
			ret = ar->type->context(C, member, result);
			if (ret) done = -(-ret | -done);

		}
	}
	if (done != 1 && recursion < 3 && (sa = CTX_wm_area(C))) {
		C->data.recursion = 3;
		if (sa->type && sa->type->context) {
			ret = sa->type->context(C, member, result);
			if (ret) done = -(-ret | -done);
		}
	}
	if (done != 1 && recursion < 4 && (sc = CTX_wm_screen(C))) {
		bContextDataCallback cb = sc->context;
		C->data.recursion = 4;
		if (cb) {
			ret = cb(C, member, result);
			if (ret) done = -(-ret | -done);
		}
	}

	C->data.recursion = recursion;

	return done;
}

static void *ctx_data_pointer_get(const bContext *C, const char *member)
{
	bContextDataResult result;

	if (C && ctx_data_get((bContext *)C, member, &result) == 1) {
		BLI_assert(result.type == CTX_DATA_TYPE_POINTER);
		return result.ptr.data;
	}
	else {
		return NULL;
	}
}

static int ctx_data_pointer_verify(const bContext *C, const char *member, void **pointer)
{
	bContextDataResult result;

	/* if context is NULL, pointer must be NULL too and that is a valid return */
	if (C == NULL) {
		*pointer = NULL;
		return 1;
	}
	else if (ctx_data_get((bContext *)C, member, &result) == 1) {
		BLI_assert(result.type == CTX_DATA_TYPE_POINTER);
		*pointer = result.ptr.data;
		return 1;
	}
	else {
		*pointer = NULL;
		return 0;
	}
}

static int ctx_data_collection_get(const bContext *C, const char *member, ListBase *list)
{
	bContextDataResult result;

	if (ctx_data_get((bContext *)C, member, &result) == 1) {
		BLI_assert(result.type == CTX_DATA_TYPE_COLLECTION);
		*list = result.list;
		return 1;
	}

	BLI_listbase_clear(list);

	return 0;
}

PointerRNA CTX_data_pointer_get(const bContext *C, const char *member)
{
	bContextDataResult result;

	if (ctx_data_get((bContext *)C, member, &result) == 1) {
		BLI_assert(result.type == CTX_DATA_TYPE_POINTER);
		return result.ptr;
	}
	else {
		return PointerRNA_NULL;
	}
}

PointerRNA CTX_data_pointer_get_type(const bContext *C, const char *member, StructRNA *type)
{
	PointerRNA ptr = CTX_data_pointer_get(C, member);

	if (ptr.data) {
		if (RNA_struct_is_a(ptr.type, type)) {
			return ptr;
		}
		else {
			printf("%s: warning, member '%s' is '%s', not '%s'\n",
			       __func__, member, RNA_struct_identifier(ptr.type), RNA_struct_identifier(type));
		}
	}
	
	return PointerRNA_NULL;
}

ListBase CTX_data_collection_get(const bContext *C, const char *member)
{
	bContextDataResult result;

	if (ctx_data_get((bContext *)C, member, &result) == 1) {
		BLI_assert(result.type == CTX_DATA_TYPE_COLLECTION);
		return result.list;
	}
	else {
		ListBase list = {NULL, NULL};
		return list;
	}
}

/* 1:found,  -1:found but not set,  0:not found */
int CTX_data_get(const bContext *C, const char *member, PointerRNA *r_ptr, ListBase *r_lb, short *r_type)
{
	bContextDataResult result;
	int ret = ctx_data_get((bContext *)C, member, &result);

	if (ret == 1) {
		*r_ptr = result.ptr;
		*r_lb = result.list;
		*r_type = result.type;
	}
	else {
		memset(r_ptr, 0, sizeof(*r_ptr));
		memset(r_lb, 0, sizeof(*r_lb));
		*r_type = 0;
	}

	return ret;
}

static void data_dir_add(ListBase *lb, const char *member, const bool use_all)
{
	LinkData *link;
	
	if ((use_all == false) && STREQ(member, "scene")) /* exception */
		return;

	if (BLI_findstring(lb, member, offsetof(LinkData, data)))
		return;
	
	link = MEM_callocN(sizeof(LinkData), "LinkData");
	link->data = (void *)member;
	BLI_addtail(lb, link);
}

/**
 * \param C Context
 * \param use_store Use 'C->wm.store'
 * \param use_rna Use Include the properties from 'RNA_Context'
 * \param use_all Don't skip values (currently only "scene")
 */
ListBase CTX_data_dir_get_ex(const bContext *C, const bool use_store, const bool use_rna, const bool use_all)
{
	bContextDataResult result;
	ListBase lb;
	bScreen *sc;
	ScrArea *sa;
	ARegion *ar;
	int a;

	memset(&lb, 0, sizeof(lb));

	if (use_rna) {
		char name[256], *nameptr;
		int namelen;

		PropertyRNA *iterprop;
		PointerRNA ctx_ptr;
		RNA_pointer_create(NULL, &RNA_Context, (void *)C, &ctx_ptr);

		iterprop = RNA_struct_iterator_property(ctx_ptr.type);

		RNA_PROP_BEGIN (&ctx_ptr, itemptr, iterprop)
		{
			nameptr = RNA_struct_name_get_alloc(&itemptr, name, sizeof(name), &namelen);
			data_dir_add(&lb, name, use_all);
			if (nameptr) {
				if (name != nameptr) {
					MEM_freeN(nameptr);
				}
			}
		}
		RNA_PROP_END;
	}
	if (use_store && C->wm.store) {
		bContextStoreEntry *entry;

		for (entry = C->wm.store->entries.first; entry; entry = entry->next)
			data_dir_add(&lb, entry->name, use_all);
	}
	if ((ar = CTX_wm_region(C)) && ar->type && ar->type->context) {
		memset(&result, 0, sizeof(result));
		ar->type->context(C, "", &result);

		if (result.dir)
			for (a = 0; result.dir[a]; a++)
				data_dir_add(&lb, result.dir[a], use_all);
	}
	if ((sa = CTX_wm_area(C)) && sa->type && sa->type->context) {
		memset(&result, 0, sizeof(result));
		sa->type->context(C, "", &result);

		if (result.dir)
			for (a = 0; result.dir[a]; a++)
				data_dir_add(&lb, result.dir[a], use_all);
	}
	if ((sc = CTX_wm_screen(C)) && sc->context) {
		bContextDataCallback cb = sc->context;
		memset(&result, 0, sizeof(result));
		cb(C, "", &result);

		if (result.dir)
			for (a = 0; result.dir[a]; a++)
				data_dir_add(&lb, result.dir[a], use_all);
	}

	return lb;
}

ListBase CTX_data_dir_get(const bContext *C)
{
	return CTX_data_dir_get_ex(C, true, false, false);
}

bool CTX_data_equals(const char *member, const char *str)
{
	return (STREQ(member, str));
}

bool CTX_data_dir(const char *member)
{
	return member[0] == '\0';
}

void CTX_data_id_pointer_set(bContextDataResult *result, ID *id)
{
	RNA_id_pointer_create(id, &result->ptr);
}

void CTX_data_pointer_set(bContextDataResult *result, ID *id, StructRNA *type, void *data)
{
	RNA_pointer_create(id, type, data, &result->ptr);
}

void CTX_data_id_list_add(bContextDataResult *result, ID *id)
{
	CollectionPointerLink *link;

	link = MEM_callocN(sizeof(CollectionPointerLink), "CTX_data_id_list_add");
	RNA_id_pointer_create(id, &link->ptr);

	BLI_addtail(&result->list, link);
}

void CTX_data_list_add(bContextDataResult *result, ID *id, StructRNA *type, void *data)
{
	CollectionPointerLink *link;

	link = MEM_callocN(sizeof(CollectionPointerLink), "CTX_data_list_add");
	RNA_pointer_create(id, type, data, &link->ptr);

	BLI_addtail(&result->list, link);
}

int ctx_data_list_count(const bContext *C, int (*func)(const bContext *, ListBase *))
{
	ListBase list;

	if (func(C, &list)) {
		int tot = BLI_listbase_count(&list);
		BLI_freelistN(&list);
		return tot;
	}
	else
		return 0;
}

void CTX_data_dir_set(bContextDataResult *result, const char **dir)
{
	result->dir = dir;
}

void CTX_data_type_set(bContextDataResult *result, short type)
{
	result->type = type;
}

short CTX_data_type_get(bContextDataResult *result)
{
	return result->type;
}



/* window manager context */

wmWindowManager *CTX_wm_manager(const bContext *C)
{
	return C->wm.manager;
}

wmWindow *CTX_wm_window(const bContext *C)
{
	return ctx_wm_python_context_get(C, "window", &RNA_Window, C->wm.window);
}

WorkSpace *CTX_wm_workspace(const bContext *C)
{
	return ctx_wm_python_context_get(C, "workspace", &RNA_WorkSpace, C->wm.workspace);
}

bScreen *CTX_wm_screen(const bContext *C)
{
	return ctx_wm_python_context_get(C, "screen", &RNA_Screen, C->wm.screen);
}

ScrArea *CTX_wm_area(const bContext *C)
{
	return ctx_wm_python_context_get(C, "area", &RNA_Area, C->wm.area);
}

SpaceLink *CTX_wm_space_data(const bContext *C)
{
	ScrArea *sa = CTX_wm_area(C);
	return (sa) ? sa->spacedata.first : NULL;
}

ARegion *CTX_wm_region(const bContext *C)
{
	return ctx_wm_python_context_get(C, "region", &RNA_Region, C->wm.region);
}

void *CTX_wm_region_data(const bContext *C)
{
	ARegion *ar = CTX_wm_region(C);
	return (ar) ? ar->regiondata : NULL;
}

struct ARegion *CTX_wm_menu(const bContext *C)
{
	return C->wm.menu;
}

struct wmManipulatorGroup *CTX_wm_manipulator_group(const bContext *C)
{
	return C->wm.manipulator_group;
}

struct wmMsgBus *CTX_wm_message_bus(const bContext *C)
{
	return C->wm.manager ? C->wm.manager->message_bus : NULL;
}

struct ReportList *CTX_wm_reports(const bContext *C)
{
	if (C->wm.manager)
		return &(C->wm.manager->reports);

	return NULL;
}

View3D *CTX_wm_view3d(const bContext *C)
{
	ScrArea *sa = CTX_wm_area(C);
	if (sa && sa->spacetype == SPACE_VIEW3D)
		return sa->spacedata.first;
	return NULL;
}

RegionView3D *CTX_wm_region_view3d(const bContext *C)
{
	ScrArea *sa = CTX_wm_area(C);
	ARegion *ar = CTX_wm_region(C);

	if (sa && sa->spacetype == SPACE_VIEW3D)
		if (ar)
			return ar->regiondata;
	return NULL;
}

struct SpaceText *CTX_wm_space_text(const bContext *C)
{
	ScrArea *sa = CTX_wm_area(C);
	if (sa && sa->spacetype == SPACE_TEXT)
		return sa->spacedata.first;
	return NULL;
}

struct SpaceConsole *CTX_wm_space_console(const bContext *C)
{
	ScrArea *sa = CTX_wm_area(C);
	if (sa && sa->spacetype == SPACE_CONSOLE)
		return sa->spacedata.first;
	return NULL;
}

struct SpaceImage *CTX_wm_space_image(const bContext *C)
{
	ScrArea *sa = CTX_wm_area(C);
	if (sa && sa->spacetype == SPACE_IMAGE)
		return sa->spacedata.first;
	return NULL;
}

struct SpaceButs *CTX_wm_space_buts(const bContext *C)
{
	ScrArea *sa = CTX_wm_area(C);
	if (sa && sa->spacetype == SPACE_BUTS)
		return sa->spacedata.first;
	return NULL;
}

struct SpaceFile *CTX_wm_space_file(const bContext *C)
{
	ScrArea *sa = CTX_wm_area(C);
	if (sa && sa->spacetype == SPACE_FILE)
		return sa->spacedata.first;
	return NULL;
}

struct SpaceSeq *CTX_wm_space_seq(const bContext *C)
{
	ScrArea *sa = CTX_wm_area(C);
	if (sa && sa->spacetype == SPACE_SEQ)
		return sa->spacedata.first;
	return NULL;
}

struct SpaceOops *CTX_wm_space_outliner(const bContext *C)
{
	ScrArea *sa = CTX_wm_area(C);
	if (sa && sa->spacetype == SPACE_OUTLINER)
		return sa->spacedata.first;
	return NULL;
}

struct SpaceNla *CTX_wm_space_nla(const bContext *C)
{
	ScrArea *sa = CTX_wm_area(C);
	if (sa && sa->spacetype == SPACE_NLA)
		return sa->spacedata.first;
	return NULL;
}

struct SpaceNode *CTX_wm_space_node(const bContext *C)
{
	ScrArea *sa = CTX_wm_area(C);
	if (sa && sa->spacetype == SPACE_NODE)
		return sa->spacedata.first;
	return NULL;
}

struct SpaceIpo *CTX_wm_space_graph(const bContext *C)
{
	ScrArea *sa = CTX_wm_area(C);
	if (sa && sa->spacetype == SPACE_IPO)
		return sa->spacedata.first;
	return NULL;
}

struct SpaceAction *CTX_wm_space_action(const bContext *C)
{
	ScrArea *sa = CTX_wm_area(C);
	if (sa && sa->spacetype == SPACE_ACTION)
		return sa->spacedata.first;
	return NULL;
}

struct SpaceInfo *CTX_wm_space_info(const bContext *C)
{
	ScrArea *sa = CTX_wm_area(C);
	if (sa && sa->spacetype == SPACE_INFO)
		return sa->spacedata.first;
	return NULL;
}

struct SpaceUserPref *CTX_wm_space_userpref(const bContext *C)
{
	ScrArea *sa = CTX_wm_area(C);
	if (sa && sa->spacetype == SPACE_USERPREF)
		return sa->spacedata.first;
	return NULL;
}

struct SpaceClip *CTX_wm_space_clip(const bContext *C)
{
	ScrArea *sa = CTX_wm_area(C);
	if (sa && sa->spacetype == SPACE_CLIP)
		return sa->spacedata.first;
	return NULL;
}

struct SpaceTopBar *CTX_wm_space_topbar(const bContext *C)
{
	ScrArea *sa = CTX_wm_area(C);
	if (sa && sa->spacetype == SPACE_TOPBAR)
		return sa->spacedata.first;
	return NULL;
}

void CTX_wm_manager_set(bContext *C, wmWindowManager *wm)
{
	C->wm.manager = wm;
	C->wm.window = NULL;
	C->wm.screen = NULL;
	C->wm.area = NULL;
	C->wm.region = NULL;
}

void CTX_wm_window_set(bContext *C, wmWindow *win)
{
	C->wm.window = win;
	if (win) {
		C->data.scene = win->scene;
	}
	C->wm.workspace = (win) ? BKE_workspace_active_get(win->workspace_hook) : NULL;
	C->wm.screen = (win) ? BKE_workspace_active_screen_get(win->workspace_hook) : NULL;
	C->wm.area = NULL;
	C->wm.region = NULL;
}

void CTX_wm_screen_set(bContext *C, bScreen *screen)
{
	C->wm.screen = screen;
	C->wm.area = NULL;
	C->wm.region = NULL;
}

void CTX_wm_area_set(bContext *C, ScrArea *area)
{
	C->wm.area = area;
	C->wm.region = NULL;
}

void CTX_wm_region_set(bContext *C, ARegion *region)
{
	C->wm.region = region;
}

void CTX_wm_menu_set(bContext *C, ARegion *menu)
{
	C->wm.menu = menu;
}

void CTX_wm_manipulator_group_set(bContext *C, struct wmManipulatorGroup *mgroup)
{
	C->wm.manipulator_group = mgroup;
}

void CTX_wm_operator_poll_msg_set(bContext *C, const char *msg)
{
	C->wm.operator_poll_msg = msg;
}

const char *CTX_wm_operator_poll_msg_get(bContext *C)
{
	return IFACE_(C->wm.operator_poll_msg);
}

/* data context */

Main *CTX_data_main(const bContext *C)
{
	Main *bmain;

	if (ctx_data_pointer_verify(C, "blend_data", (void *)&bmain))
		return bmain;
	else
		return C->data.main;
}

void CTX_data_main_set(bContext *C, Main *bmain)
{
	C->data.main = bmain;
	BKE_sound_init_main(bmain);
}

Scene *CTX_data_scene(const bContext *C)
{
	Scene *scene;

	if (ctx_data_pointer_verify(C, "scene", (void *)&scene))
		return scene;
	else
		return C->data.scene;
}

ViewLayer *CTX_data_view_layer(const bContext *C)
{
	ViewLayer *view_layer;

	if (ctx_data_pointer_verify(C, "view_layer", (void *)&view_layer)) {
		return view_layer;
	}
	else {
		return BKE_view_layer_from_workspace_get(CTX_data_scene(C), CTX_wm_workspace(C));
	}
}

RenderEngineType *CTX_data_engine_type(const bContext *C)
{
	Scene *scene = CTX_data_scene(C);
	return RE_engines_find(scene->r.engine);
}

/**
 * This is tricky. Sometimes the user overrides the render_layer
 * but not the scene_collection. In this case what to do?
 *
 * If the scene_collection is linked to the ViewLayer we use it.
 * Otherwise we fallback to the active one of the ViewLayer.
 */
LayerCollection *CTX_data_layer_collection(const bContext *C)
{
	ViewLayer *view_layer = CTX_data_view_layer(C);
	LayerCollection *layer_collection;

	if (ctx_data_pointer_verify(C, "layer_collection", (void *)&layer_collection)) {
		if (BKE_view_layer_has_collection(view_layer, layer_collection->collection)) {
			return layer_collection;
		}
	}

	/* fallback */
	return BKE_layer_collection_get_active(view_layer);
}

Collection *CTX_data_collection(const bContext *C)
{
	Collection *collection;
	if (ctx_data_pointer_verify(C, "collection", (void *)&collection)) {
		return collection;
	}

	LayerCollection *layer_collection = CTX_data_layer_collection(C);
	if (layer_collection) {
		return layer_collection->collection;
	}

	/* fallback */
	Scene *scene = CTX_data_scene(C);
	return BKE_collection_master(scene);
}

int CTX_data_mode_enum_ex(const Object *obedit, const Object *ob, const eObjectMode object_mode)
{
	// Object *obedit = CTX_data_edit_object(C);
	if (obedit) {
		switch (obedit->type) {
			case OB_MESH:
				return CTX_MODE_EDIT_MESH;
			case OB_CURVE:
				return CTX_MODE_EDIT_CURVE;
			case OB_SURF:
				return CTX_MODE_EDIT_SURFACE;
			case OB_FONT:
				return CTX_MODE_EDIT_TEXT;
			case OB_ARMATURE:
				return CTX_MODE_EDIT_ARMATURE;
			case OB_MBALL:
				return CTX_MODE_EDIT_METABALL;
			case OB_LATTICE:
				return CTX_MODE_EDIT_LATTICE;
		}
	}
	else {
		// Object *ob = CTX_data_active_object(C);
		if (ob) {
			if (object_mode & OB_MODE_POSE) return CTX_MODE_POSE;
			else if (object_mode & OB_MODE_SCULPT) return CTX_MODE_SCULPT;
			else if (object_mode & OB_MODE_WEIGHT_PAINT) return CTX_MODE_PAINT_WEIGHT;
			else if (object_mode & OB_MODE_VERTEX_PAINT) return CTX_MODE_PAINT_VERTEX;
			else if (object_mode & OB_MODE_TEXTURE_PAINT) return CTX_MODE_PAINT_TEXTURE;
			else if (object_mode & OB_MODE_PARTICLE_EDIT) return CTX_MODE_PARTICLE;
		}
	}

	return CTX_MODE_OBJECT;
}

int CTX_data_mode_enum(const bContext *C)
{
	Object *obedit = CTX_data_edit_object(C);
	Object *obact = obedit ? NULL : CTX_data_active_object(C);
	return CTX_data_mode_enum_ex(obedit, obact, obact ? obact->mode : OB_MODE_OBJECT);
}

/* would prefer if we can use the enum version below over this one - Campbell */
/* must be aligned with above enum  */
static const char *data_mode_strings[] = {
	"mesh_edit",
	"curve_edit",
	"surface_edit",
	"text_edit",
	"armature_edit",
	"mball_edit",
	"lattice_edit",
	"posemode",
	"sculpt_mode",
	"weightpaint",
	"vertexpaint",
	"imagepaint",
	"particlemode",
	"objectmode",
	NULL
};
BLI_STATIC_ASSERT(ARRAY_SIZE(data_mode_strings) == CTX_MODE_NUM + 1, "Must have a string for each context mode")
const char *CTX_data_mode_string(const bContext *C)
{
	return data_mode_strings[CTX_data_mode_enum(C)];
}

void CTX_data_scene_set(bContext *C, Scene *scene)
{
	C->data.scene = scene;
}

ToolSettings *CTX_data_tool_settings(const bContext *C)
{
	Scene *scene = CTX_data_scene(C);

	if (scene)
		return scene->toolsettings;
	else
		return NULL;
}

int CTX_data_selected_nodes(const bContext *C, ListBase *list)
{
	return ctx_data_collection_get(C, "selected_nodes", list);
}

int CTX_data_selected_editable_objects(const bContext *C, ListBase *list)
{
	return ctx_data_collection_get(C, "selected_editable_objects", list);
}

int CTX_data_selected_editable_bases(const bContext *C, ListBase *list)
{
	return ctx_data_collection_get(C, "selected_editable_bases", list);
}

int CTX_data_editable_objects(const bContext *C, ListBase *list)
{
	return ctx_data_collection_get(C, "editable_objects", list);
}

int CTX_data_editable_bases(const bContext *C, ListBase *list)
{
	return ctx_data_collection_get(C, "editable_bases", list);
}

int CTX_data_selected_objects(const bContext *C, ListBase *list)
{
	return ctx_data_collection_get(C, "selected_objects", list);
}

int CTX_data_selected_bases(const bContext *C, ListBase *list)
{
	return ctx_data_collection_get(C, "selected_bases", list);
}

int CTX_data_visible_objects(const bContext *C, ListBase *list)
{
	return ctx_data_collection_get(C, "visible_objects", list);
}

int CTX_data_visible_bases(const bContext *C, ListBase *list)
{
	return ctx_data_collection_get(C, "visible_bases", list);
}

int CTX_data_selectable_objects(const bContext *C, ListBase *list)
{
	return ctx_data_collection_get(C, "selectable_objects", list);
}

int CTX_data_selectable_bases(const bContext *C, ListBase *list)
{
	return ctx_data_collection_get(C, "selectable_bases", list);
}

struct Object *CTX_data_active_object(const bContext *C)
{
	return ctx_data_pointer_get(C, "active_object");
}

struct Base *CTX_data_active_base(const bContext *C)
{
	return ctx_data_pointer_get(C, "active_base");
}

struct Object *CTX_data_edit_object(const bContext *C)
{
	return ctx_data_pointer_get(C, "edit_object");
}

struct Image *CTX_data_edit_image(const bContext *C)
{
	return ctx_data_pointer_get(C, "edit_image");
}

struct Text *CTX_data_edit_text(const bContext *C)
{
	return ctx_data_pointer_get(C, "edit_text");
}

struct MovieClip *CTX_data_edit_movieclip(const bContext *C)
{
	return ctx_data_pointer_get(C, "edit_movieclip");
}

struct Mask *CTX_data_edit_mask(const bContext *C)
{
	return ctx_data_pointer_get(C, "edit_mask");
}

struct EditBone *CTX_data_active_bone(const bContext *C)
{
	return ctx_data_pointer_get(C, "active_bone");
}

struct CacheFile *CTX_data_edit_cachefile(const bContext *C)
{
	return ctx_data_pointer_get(C, "edit_cachefile");
}

int CTX_data_selected_bones(const bContext *C, ListBase *list)
{
	return ctx_data_collection_get(C, "selected_bones", list);
}

int CTX_data_selected_editable_bones(const bContext *C, ListBase *list)
{
	return ctx_data_collection_get(C, "selected_editable_bones", list);
}

int CTX_data_visible_bones(const bContext *C, ListBase *list)
{
	return ctx_data_collection_get(C, "visible_bones", list);
}

int CTX_data_editable_bones(const bContext *C, ListBase *list)
{
	return ctx_data_collection_get(C, "editable_bones", list);
}

struct bPoseChannel *CTX_data_active_pose_bone(const bContext *C)
{
	return ctx_data_pointer_get(C, "active_pose_bone");
}

int CTX_data_selected_pose_bones(const bContext *C, ListBase *list)
{
	return ctx_data_collection_get(C, "selected_pose_bones", list);
}

int CTX_data_visible_pose_bones(const bContext *C, ListBase *list)
{
	return ctx_data_collection_get(C, "visible_pose_bones", list);
}

bGPdata *CTX_data_gpencil_data(const bContext *C)
{
	return ctx_data_pointer_get(C, "gpencil_data");
}

bGPDlayer *CTX_data_active_gpencil_layer(const bContext *C)
{
	return ctx_data_pointer_get(C, "active_gpencil_layer");
}

bGPDpalette *CTX_data_active_gpencil_palette(const bContext *C)
{
	return ctx_data_pointer_get(C, "active_gpencil_palette");
}

bGPDpalettecolor *CTX_data_active_gpencil_palettecolor(const bContext *C)
{
	return ctx_data_pointer_get(C, "active_gpencil_palettecolor");
}

bGPDbrush *CTX_data_active_gpencil_brush(const bContext *C)
{
	return ctx_data_pointer_get(C, "active_gpencil_brush");
}

bGPDframe *CTX_data_active_gpencil_frame(const bContext *C)
{
	return ctx_data_pointer_get(C, "active_gpencil_frame");
}

int CTX_data_visible_gpencil_layers(const bContext *C, ListBase *list)
{
	return ctx_data_collection_get(C, "visible_gpencil_layers", list);
}

int CTX_data_editable_gpencil_layers(const bContext *C, ListBase *list)
{
	return ctx_data_collection_get(C, "editable_gpencil_layers", list);
}

int CTX_data_editable_gpencil_strokes(const bContext *C, ListBase *list)
{
	return ctx_data_collection_get(C, "editable_gpencil_strokes", list);
}

Depsgraph *CTX_data_depsgraph(const bContext *C)
{
	Scene *scene = CTX_data_scene(C);
	ViewLayer *view_layer = CTX_data_view_layer(C);
	return BKE_scene_get_depsgraph(scene, view_layer, true);
}

Depsgraph *CTX_data_depsgraph_on_load(const bContext *C)
{
	Scene *scene = CTX_data_scene(C);
	ViewLayer *view_layer = CTX_data_view_layer(C);
	return BKE_scene_get_depsgraph(scene, view_layer, false);
}