Cleanup: use bool instead of int in various places

27 files changed, 109 insertions, 109 deletions

diff --git a/source/blender/editors/gpencil/gpencil_primitive.c b/source/blender/editors/gpencil/gpencil_primitive.c
index a4c8fc770e2..04e440a1960 100644
--- a/source/blender/editors/gpencil/gpencil_primitive.c
+++ b/source/blender/editors/gpencil/gpencil_primitive.c
@@ -255,13 +255,13 @@ static bool gpencil_primitive_add_poll(bContext *C)
   /* only 3D view */
   ScrArea *area = CTX_wm_area(C);
   if (area && area->spacetype != SPACE_VIEW3D) {
-    return 0;
+    return false;
   }
 
   /* need data to create primitive */
   bGPdata *gpd = CTX_data_gpencil_data(C);
   if (gpd == NULL) {
-    return 0;
+    return false;
   }
 
   /* only in edit and paint modes
@@ -271,7 +271,7 @@ static bool gpencil_primitive_add_poll(bContext *C)
    */
   if ((gpd->flag & (GP_DATA_STROKE_PAINTMODE | GP_DATA_STROKE_EDITMODE)) == 0) {
     CTX_wm_operator_poll_msg_set(C, "Primitives can only be added in Draw or Edit modes");
-    return 0;
+    return false;
   }
 
   /* don't allow operator to function if the active layer is locked/hidden
@@ -281,10 +281,10 @@ static bool gpencil_primitive_add_poll(bContext *C)
   if ((gpl) && (gpl->flag & (GP_LAYER_LOCKED | GP_LAYER_HIDE))) {
     CTX_wm_operator_poll_msg_set(C,
                                  "Primitives cannot be added as active layer is locked or hidden");
-    return 0;
+    return false;
   }
 
-  return 1;
+  return true;
 }
 
 /* Allocate memory to stroke, adds MAX_EDGES on every call */
diff --git a/source/blender/editors/include/ED_object.h b/source/blender/editors/include/ED_object.h
index f1ddc10f1a8..dc674aefe2e 100644
--- a/source/blender/editors/include/ED_object.h
+++ b/source/blender/editors/include/ED_object.h
@@ -381,7 +381,7 @@ bool ED_object_modifier_move_to_index(struct ReportList *reports,
                                       struct ModifierData *md,
                                       const int index);
 
-int ED_object_modifier_convert(struct ReportList *reports,
+bool ED_object_modifier_convert(struct ReportList *reports,
                                struct Main *bmain,
                                struct Depsgraph *depsgraph,
                                struct Scene *scene,
diff --git a/source/blender/editors/interface/interface_eyedropper_datablock.c b/source/blender/editors/interface/interface_eyedropper_datablock.c
index dd55d2c364b..6a12f550d7c 100644
--- a/source/blender/editors/interface/interface_eyedropper_datablock.c
+++ b/source/blender/editors/interface/interface_eyedropper_datablock.c
@@ -355,12 +355,12 @@ static bool datadropper_poll(bContext *C)
       StructRNA *type = RNA_property_pointer_type(&ptr, prop);
       const short idcode = RNA_type_to_ID_code(type);
       if ((idcode == ID_OB) || OB_DATA_SUPPORT_ID(idcode)) {
-        return 1;
+        return true;
       }
     }
   }
 
-  return 0;
+  return false;
 }
 
 void UI_OT_eyedropper_id(wmOperatorType *ot)
diff --git a/source/blender/editors/interface/interface_eyedropper_depth.c b/source/blender/editors/interface/interface_eyedropper_depth.c
index ac142fe7217..fbc0ed1fc1f 100644
--- a/source/blender/editors/interface/interface_eyedropper_depth.c
+++ b/source/blender/editors/interface/interface_eyedropper_depth.c
@@ -351,7 +351,7 @@ static bool depthdropper_poll(bContext *C)
     if ((RNA_property_type(prop) == PROP_FLOAT) &&
         (RNA_property_subtype(prop) & PROP_UNIT_LENGTH) &&
         (RNA_property_array_check(prop) == false)) {
-      return 1;
+      return true;
     }
   }
   else {
@@ -359,12 +359,12 @@ static bool depthdropper_poll(bContext *C)
     if (rv3d && rv3d->persp == RV3D_CAMOB) {
       View3D *v3d = CTX_wm_view3d(C);
       if (v3d->camera && v3d->camera->data && !ID_IS_LINKED(v3d->camera->data)) {
-        return 1;
+        return true;
       }
     }
   }
 
-  return 0;
+  return false;
 }
 
 void UI_OT_eyedropper_depth(wmOperatorType *ot)
diff --git a/source/blender/editors/interface/interface_eyedropper_driver.c b/source/blender/editors/interface/interface_eyedropper_driver.c
index d13e47624ee..29c0368219b 100644
--- a/source/blender/editors/interface/interface_eyedropper_driver.c
+++ b/source/blender/editors/interface/interface_eyedropper_driver.c
@@ -207,9 +207,9 @@ static int driverdropper_exec(bContext *C, wmOperator *op)
 static bool driverdropper_poll(bContext *C)
 {
   if (!CTX_wm_window(C)) {
-    return 0;
+    return false;
   }
-  return 1;
+  return true;
 }
 
 void UI_OT_eyedropper_driver(wmOperatorType *ot)
diff --git a/source/blender/editors/interface/interface_handlers.c b/source/blender/editors/interface/interface_handlers.c
index bf88b3c0318..143ca6a0ef1 100644
--- a/source/blender/editors/interface/interface_handlers.c
+++ b/source/blender/editors/interface/interface_handlers.c
@@ -10988,11 +10988,11 @@ bool UI_but_active_drop_name(bContext *C)
 
   if (but) {
     if (ELEM(but->type, UI_BTYPE_TEXT, UI_BTYPE_SEARCH_MENU)) {
-      return 1;
+      return true;
     }
   }
 
-  return 0;
+  return false;
 }
 
 bool UI_but_active_drop_color(bContext *C)
diff --git a/source/blender/editors/interface/interface_ops.c b/source/blender/editors/interface/interface_ops.c
index d6919fb4de7..c9f21c7fc2e 100644
--- a/source/blender/editors/interface/interface_ops.c
+++ b/source/blender/editors/interface/interface_ops.c
@@ -91,11 +91,11 @@ static bool copy_data_path_button_poll(bContext *C)
 
     if (path) {
       MEM_freeN(path);
-      return 1;
+      return true;
     }
   }
 
-  return 0;
+  return false;
 }
 
 static int copy_data_path_button_exec(bContext *C, wmOperator *op)
@@ -182,11 +182,11 @@ static bool copy_as_driver_button_poll(bContext *C)
 
     if (path) {
       MEM_freeN(path);
-      return 1;
+      return true;
     }
   }
 
-  return 0;
+  return false;
 }
 
 static int copy_as_driver_button_exec(bContext *C, wmOperator *op)
diff --git a/source/blender/editors/interface/view2d_ops.c b/source/blender/editors/interface/view2d_ops.c
index 7234e279da8..c6b29f79137 100644
--- a/source/blender/editors/interface/view2d_ops.c
+++ b/source/blender/editors/interface/view2d_ops.c
@@ -107,7 +107,7 @@ typedef struct v2dViewPanData {
 } v2dViewPanData;
 
 /* initialize panning customdata */
-static int view_pan_init(bContext *C, wmOperator *op)
+static bool view_pan_init(bContext *C, wmOperator *op)
 {
   ARegion *region = CTX_wm_region(C);
   v2dViewPanData *vpd;
@@ -116,13 +116,13 @@ static int view_pan_init(bContext *C, wmOperator *op)
 
   /* regions now have v2d-data by default, so check for region */
   if (region == NULL) {
-    return 0;
+    return false;
   }
 
   /* check if panning is allowed at all */
   v2d = &region->v2d;
   if ((v2d->keepofs & V2D_LOCKOFS_X) && (v2d->keepofs & V2D_LOCKOFS_Y)) {
-    return 0;
+    return false;
   }
 
   /* set custom-data for operator */
@@ -141,7 +141,7 @@ static int view_pan_init(bContext *C, wmOperator *op)
   vpd->facx = (BLI_rctf_size_x(&v2d->cur)) / winx;
   vpd->facy = (BLI_rctf_size_y(&v2d->cur)) / winy;
 
-  return 1;
+  return true;
 }
 
 #ifdef WITH_INPUT_NDOF
@@ -152,17 +152,17 @@ static bool view_pan_poll(bContext *C)
 
   /* check if there's a region in context to work with */
   if (region == NULL) {
-    return 0;
+    return false;
   }
   v2d = &region->v2d;
 
   /* check that 2d-view can pan */
   if ((v2d->keepofs & V2D_LOCKOFS_X) && (v2d->keepofs & V2D_LOCKOFS_Y)) {
-    return 0;
+    return false;
   }
 
   /* view can pan */
-  return 1;
+  return true;
 }
 #endif
 
@@ -808,7 +808,7 @@ static void view_zoom_axis_lock_defaults(bContext *C, bool r_do_zoom_xy[2])
 }
 
 /* initialize panning customdata */
-static int view_zoomdrag_init(bContext *C, wmOperator *op)
+static bool view_zoomdrag_init(bContext *C, wmOperator *op)
 {
   ARegion *region = CTX_wm_region(C);
   v2dViewZoomData *vzd;
@@ -816,13 +816,13 @@ static int view_zoomdrag_init(bContext *C, wmOperator *op)
 
   /* regions now have v2d-data by default, so check for region */
   if (region == NULL) {
-    return 0;
+    return false;
   }
   v2d = &region->v2d;
 
   /* check that 2d-view is zoomable */
   if ((v2d->keepzoom & V2D_LOCKZOOM_X) && (v2d->keepzoom & V2D_LOCKZOOM_Y)) {
-    return 0;
+    return false;
   }
 
   /* set custom-data for operator */
@@ -833,7 +833,7 @@ static int view_zoomdrag_init(bContext *C, wmOperator *op)
   vzd->v2d = v2d;
   vzd->region = region;
 
-  return 1;
+  return true;
 }
 
 /* check if step-zoom can be applied */
diff --git a/source/blender/editors/lattice/editlattice_tools.c b/source/blender/editors/lattice/editlattice_tools.c
index 0cfe59ef06c..d503cbc87b8 100644
--- a/source/blender/editors/lattice/editlattice_tools.c
+++ b/source/blender/editors/lattice/editlattice_tools.c
@@ -58,7 +58,7 @@ static bool make_regular_poll(bContext *C)
   Object *ob;
 
   if (ED_operator_editlattice(C)) {
-    return 1;
+    return true;
   }
 
   ob = CTX_data_active_object(C);
diff --git a/source/blender/editors/mask/mask_editaction.c b/source/blender/editors/mask/mask_editaction.c
index 31fc403b157..af99df4c5d8 100644
--- a/source/blender/editors/mask/mask_editaction.c
+++ b/source/blender/editors/mask/mask_editaction.c
@@ -122,12 +122,12 @@ bool ED_masklayer_frame_select_check(MaskLayer *mask_layer)
   for (mask_layer_shape = mask_layer->splines_shapes.first; mask_layer_shape;
        mask_layer_shape = mask_layer_shape->next) {
     if (mask_layer_shape->flag & MASK_SHAPE_SELECT) {
-      return 1;
+      return true;
     }
   }
 
   /* not found */
-  return 0;
+  return false;
 }
 
 /* helper function - select mask-frame based on SELECT_* mode */
diff --git a/source/blender/editors/object/object_gpencil_modifier.c b/source/blender/editors/object/object_gpencil_modifier.c
index cfa55c68a56..575ef38476c 100644
--- a/source/blender/editors/object/object_gpencil_modifier.c
+++ b/source/blender/editors/object/object_gpencil_modifier.c
@@ -117,7 +117,7 @@ static bool gpencil_object_modifier_remove(Main *bmain,
    * get called twice on same modifier, so make
    * sure it is in list. */
   if (BLI_findindex(&ob->greasepencil_modifiers, md) == -1) {
-    return 0;
+    return false;
   }
 
   DEG_relations_tag_update(bmain);
@@ -126,7 +126,7 @@ static bool gpencil_object_modifier_remove(Main *bmain,
   BKE_gpencil_modifier_free(md);
   BKE_object_free_derived_caches(ob);
 
-  return 1;
+  return true;
 }
 
 bool ED_object_gpencil_modifier_remove(ReportList *reports,
@@ -141,13 +141,13 @@ bool ED_object_gpencil_modifier_remove(ReportList *reports,
 
   if (!ok) {
     BKE_reportf(reports, RPT_ERROR, "Modifier '%s' not in object '%s'", md->name, ob->id.name);
-    return 0;
+    return false;
   }
 
   DEG_id_tag_update(&ob->id, ID_RECALC_GEOMETRY);
   DEG_relations_tag_update(bmain);
 
-  return 1;
+  return true;
 }
 
 void ED_object_gpencil_modifier_clear(Main *bmain, Object *ob)
diff --git a/source/blender/editors/object/object_hook.c b/source/blender/editors/object/object_hook.c
index 6bb03e62191..aaf76ff649e 100644
--- a/source/blender/editors/object/object_hook.c
+++ b/source/blender/editors/object/object_hook.c
@@ -482,18 +482,18 @@ static bool hook_op_edit_poll(bContext *C)
 
   if (obedit) {
     if (ED_operator_editmesh(C)) {
-      return 1;
+      return true;
     }
     if (ED_operator_editsurfcurve(C)) {
-      return 1;
+      return true;
     }
     if (ED_operator_editlattice(C)) {
-      return 1;
+      return true;
     }
-    // if (ED_operator_editmball(C)) return 1;
+    // if (ED_operator_editmball(C)) return true;
   }
 
-  return 0;
+  return false;
 }
 
 static Object *add_hook_object_new(
diff --git a/source/blender/editors/object/object_modifier.c b/source/blender/editors/object/object_modifier.c
index 14882ab8ffc..692a445fe9c 100644
--- a/source/blender/editors/object/object_modifier.c
+++ b/source/blender/editors/object/object_modifier.c
@@ -397,13 +397,13 @@ bool ED_object_modifier_remove(
 
   if (!ok) {
     BKE_reportf(reports, RPT_ERROR, "Modifier '%s' not in object '%s'", md->name, ob->id.name);
-    return 0;
+    return false;
   }
 
   DEG_id_tag_update(&ob->id, ID_RECALC_GEOMETRY);
   DEG_relations_tag_update(bmain);
 
-  return 1;
+  return true;
 }
 
 void ED_object_modifier_clear(Main *bmain, Scene *scene, Object *ob)
@@ -513,13 +513,13 @@ bool ED_object_modifier_move_to_index(ReportList *reports,
   return true;
 }
 
-int ED_object_modifier_convert(ReportList *UNUSED(reports),
-                               Main *bmain,
-                               Depsgraph *depsgraph,
-                               Scene *scene,
-                               ViewLayer *view_layer,
-                               Object *ob,
-                               ModifierData *md)
+bool ED_object_modifier_convert(ReportList *UNUSED(reports),
+                                Main *bmain,
+                                Depsgraph *depsgraph,
+                                Scene *scene,
+                                ViewLayer *view_layer,
+                                Object *ob,
+                                ModifierData *md)
 {
   Object *obn;
   ParticleSystem *psys_orig, *psys_eval;
@@ -533,21 +533,21 @@ int ED_object_modifier_convert(ReportList *UNUSED(reports),
   int totpart = 0, totchild = 0;
 
   if (md->type != eModifierType_ParticleSystem) {
-    return 0;
+    return false;
   }
   if (ob && ob->mode & OB_MODE_PARTICLE_EDIT) {
-    return 0;
+    return false;
   }
 
   psys_orig = ((ParticleSystemModifierData *)md)->psys;
   part = psys_orig->part;
 
   if (part->ren_as != PART_DRAW_PATH) {
-    return 0;
+    return false;
   }
   psys_eval = psys_eval_get(depsgraph, ob, psys_orig);
   if (psys_eval->pathcache == NULL) {
-    return 0;
+    return false;
   }
 
   totpart = psys_eval->totcached;
@@ -579,7 +579,7 @@ int ED_object_modifier_convert(ReportList *UNUSED(reports),
   }
 
   if (totvert == 0) {
-    return 0;
+    return false;
   }
 
   /* add new mesh */
@@ -637,7 +637,7 @@ int ED_object_modifier_convert(ReportList *UNUSED(reports),
 
   DEG_relations_tag_update(bmain);
 
-  return 1;
+  return true;
 }
 
 /* Gets mesh for the modifier which corresponds to an evaluated state. */
diff --git a/source/blender/editors/sculpt_paint/sculpt.c b/source/blender/editors/sculpt_paint/sculpt.c
index 7a066f35f23..7cb4f74282b 100644
--- a/source/blender/editors/sculpt_paint/sculpt.c
+++ b/source/blender/editors/sculpt_paint/sculpt.c
@@ -1771,10 +1771,10 @@ static bool sculpt_brush_test_cyl(SculptBrushTest *test,
 
     test->dist = dist;
 
-    return 1;
+    return true;
   }
 
-  return 0;
+  return false;
 }
 
 #endif
diff --git a/source/blender/editors/sculpt_paint/sculpt_uv.c b/source/blender/editors/sculpt_paint/sculpt_uv.c
index be509f4aed6..5be72ec87e7 100644
--- a/source/blender/editors/sculpt_paint/sculpt_uv.c
+++ b/source/blender/editors/sculpt_paint/sculpt_uv.c
@@ -472,9 +472,9 @@ static bool uv_edge_compare(const void *a, const void *b)
   const UvEdge *edge2 = b;
 
   if ((edge1->uv1 == edge2->uv1) && (edge1->uv2 == edge2->uv2)) {
-    return 0;
+    return false;
   }
-  return 1;
+  return true;
 }
 
 static UvSculptData *uv_sculpt_stroke_init(bContext *C, wmOperator *op, const wmEvent *event)
diff --git a/source/blender/editors/sound/sound_ops.c b/source/blender/editors/sound/sound_ops.c
index d4f5f066d48..87b84c475fd 100644
--- a/source/blender/editors/sound/sound_ops.c
+++ b/source/blender/editors/sound/sound_ops.c
@@ -749,10 +749,10 @@ static bool sound_poll(bContext *C)
   Editing *ed = CTX_data_scene(C)->ed;
 
   if (!ed || !ed->act_seq || ed->act_seq->type != SEQ_TYPE_SOUND_RAM) {
-    return 0;
+    return false;
   }
 
-  return 1;
+  return true;
 }
 /********************* pack operator *********************/
 
diff --git a/source/blender/editors/space_file/space_file.c b/source/blender/editors/space_file/space_file.c
index 61d6d8bf678..edc1e83e882 100644
--- a/source/blender/editors/space_file/space_file.c
+++ b/source/blender/editors/space_file/space_file.c
@@ -662,10 +662,10 @@ static bool filepath_drop_poll(bContext *C,
   if (drag->type == WM_DRAG_PATH) {
     SpaceFile *sfile = CTX_wm_space_file(C);
     if (sfile) {
-      return 1;
+      return true;
     }
   }
-  return 0;
+  return false;
 }
 
 static void filepath_drop_copy(wmDrag *drag, wmDropBox *drop)
diff --git a/source/blender/editors/space_graph/graph_buttons.c b/source/blender/editors/space_graph/graph_buttons.c
index 0158e12c79c..6dbf6226de8 100644
--- a/source/blender/editors/space_graph/graph_buttons.c
+++ b/source/blender/editors/space_graph/graph_buttons.c
@@ -72,7 +72,7 @@
 
 /* -------------- */
 
-static int graph_panel_context(const bContext *C, bAnimListElem **ale, FCurve **fcu)
+static bool graph_panel_context(const bContext *C, bAnimListElem **ale, FCurve **fcu)
 {
   bAnimContext ac;
   bAnimListElem *elem = NULL;
@@ -83,13 +83,13 @@ static int graph_panel_context(const bContext *C, bAnimListElem **ale, FCurve **
    * There's no point showing empty panels?
    */
   if (ANIM_animdata_get_context(C, &ac) == 0) {
-    return 0;
+    return false;
   }
 
   /* try to find 'active' F-Curve */
   elem = get_active_fcurve_channel(&ac);
   if (elem == NULL) {
-    return 0;
+    return false;
   }
 
   if (fcu) {
@@ -102,7 +102,7 @@ static int graph_panel_context(const bContext *C, bAnimListElem **ale, FCurve **
     MEM_freeN(elem);
   }
 
-  return 1;
+  return true;
 }
 
 static bool graph_panel_poll(const bContext *C, PanelType *UNUSED(pt))
@@ -235,7 +235,7 @@ static void graph_panel_properties(const bContext *C, Panel *panel)
 /* ******************* active Keyframe ************** */
 
 /* get 'active' keyframe for panel editing */
-static short get_active_fcurve_keyframe_edit(FCurve *fcu, BezTriple **bezt, BezTriple **prevbezt)
+static bool get_active_fcurve_keyframe_edit(FCurve *fcu, BezTriple **bezt, BezTriple **prevbezt)
 {
   BezTriple *b;
   int i;
@@ -245,7 +245,7 @@ static short get_active_fcurve_keyframe_edit(FCurve *fcu, BezTriple **bezt, BezT
 
   /* sanity checks */
   if ((fcu->bezt == NULL) || (fcu->totvert == 0)) {
-    return 0;
+    return false;
   }
 
   /* find first selected keyframe for now, and call it the active one
@@ -261,12 +261,12 @@ static short get_active_fcurve_keyframe_edit(FCurve *fcu, BezTriple **bezt, BezT
       *prevbezt = (i > 0) ? b - 1 : b;
       *bezt = b;
 
-      return 1;
+      return true;
     }
   }
 
   /* not found */
-  return 0;
+  return false;
 }
 
 /* update callback for active keyframe properties - base updates stuff */
diff --git a/source/blender/editors/space_graph/graph_select.c b/source/blender/editors/space_graph/graph_select.c
index 160b731629c..0c05942ec4b 100644
--- a/source/blender/editors/space_graph/graph_select.c
+++ b/source/blender/editors/space_graph/graph_select.c
@@ -95,12 +95,12 @@ typedef enum eGraphVertIndex {
 static bool fcurve_handle_sel_check(SpaceGraph *sipo, BezTriple *bezt)
 {
   if (sipo->flag & SIPO_NOHANDLES) {
-    return 0;
+    return false;
   }
   if ((sipo->flag & SIPO_SELVHANDLESONLY) && BEZT_ISSEL_ANY(bezt) == 0) {
-    return 0;
+    return false;
   }
-  return 1;
+  return true;
 }
 
 /* check if the given vertex is within bounds or not */
diff --git a/source/blender/editors/space_image/image_ops.c b/source/blender/editors/space_image/image_ops.c
index f312981d0e1..0a8bcd91f34 100644
--- a/source/blender/editors/space_image/image_ops.c
+++ b/source/blender/editors/space_image/image_ops.c
@@ -270,10 +270,10 @@ static bool space_image_main_area_not_uv_brush_poll(bContext *C)
   ToolSettings *toolsettings = scene->toolsettings;
 
   if (sima && !toolsettings->uvsculpt && (CTX_data_edit_object(C) == NULL)) {
-    return 1;
+    return true;
   }
 
-  return 0;
+  return false;
 }
 
 /** \} */
@@ -2897,16 +2897,16 @@ static bool image_pack_test(bContext *C, wmOperator *op)
   Image *ima = image_from_context(C);
 
   if (!ima) {
-    return 0;
+    return false;
   }
 
   if (ELEM(ima->source, IMA_SRC_SEQUENCE, IMA_SRC_MOVIE, IMA_SRC_TILED)) {
     BKE_report(
         op->reports, RPT_ERROR, "Packing movies, image sequences or tiled images not supported");
-    return 0;
+    return false;
   }
 
-  return 1;
+  return true;
 }
 
 static int image_pack_exec(bContext *C, wmOperator *op)
diff --git a/source/blender/editors/space_node/drawnode.c b/source/blender/editors/space_node/drawnode.c
index 5866b5cc12f..82f3b71eb32 100644
--- a/source/blender/editors/space_node/drawnode.c
+++ b/source/blender/editors/space_node/drawnode.c
@@ -3766,7 +3766,7 @@ static bool node_link_bezier_handles(View2D *v2d,
   }
   else {
     if (snode == NULL) {
-      return 0;
+      return false;
     }
     copy_v2_v2(vec[0], cursor);
     fromreroute = 0;
@@ -3778,7 +3778,7 @@ static bool node_link_bezier_handles(View2D *v2d,
   }
   else {
     if (snode == NULL) {
-      return 0;
+      return false;
     }
     copy_v2_v2(vec[3], cursor);
     toreroute = 0;
@@ -3791,7 +3791,7 @@ static bool node_link_bezier_handles(View2D *v2d,
     /* Straight line: align all points. */
     mid_v2_v2v2(vec[1], vec[0], vec[3]);
     mid_v2_v2v2(vec[2], vec[1], vec[3]);
-    return 1;
+    return true;
   }
 
   dist = curving * 0.10f * fabsf(vec[0][0] - vec[3][0]);
@@ -3828,13 +3828,13 @@ static bool node_link_bezier_handles(View2D *v2d,
   }
 
   if (v2d && min_ffff(vec[0][0], vec[1][0], vec[2][0], vec[3][0]) > v2d->cur.xmax) {
-    return 0; /* clipped */
+    return false; /* clipped */
   }
   if (v2d && max_ffff(vec[0][0], vec[1][0], vec[2][0], vec[3][0]) < v2d->cur.xmin) {
-    return 0; /* clipped */
+    return false; /* clipped */
   }
 
-  return 1;
+  return true;
 }
 
 /* if v2d not NULL, it clips and returns 0 if not visible */
diff --git a/source/blender/editors/space_node/node_add.c b/source/blender/editors/space_node/node_add.c
index 037fe575973..68f4bd0ff38 100644
--- a/source/blender/editors/space_node/node_add.c
+++ b/source/blender/editors/space_node/node_add.c
@@ -109,12 +109,12 @@ static bool add_reroute_intersect_check(bNodeLink *link,
         if (isect_seg_seg_v2(mcoords[i], mcoords[i + 1], coord_array[b], coord_array[b + 1]) > 0) {
           result[0] = (mcoords[i][0] + mcoords[i + 1][0]) / 2.0f;
           result[1] = (mcoords[i][1] + mcoords[i + 1][1]) / 2.0f;
-          return 1;
+          return true;
         }
       }
     }
   }
-  return 0;
+  return false;
 }
 
 typedef struct bNodeSocketLink {
diff --git a/source/blender/editors/space_node/node_draw.c b/source/blender/editors/space_node/node_draw.c
index 56e53e79a8d..ba6b164704f 100644
--- a/source/blender/editors/space_node/node_draw.c
+++ b/source/blender/editors/space_node/node_draw.c
@@ -188,7 +188,7 @@ static bool compare_nodes(const bNode *a, const bNode *b)
   for (parent = a->parent; parent; parent = parent->parent) {
     /* if b is an ancestor, it is always behind a */
     if (parent == b) {
-      return 1;
+      return true;
     }
     /* any selected ancestor moves the node forward */
     if (parent->flag & NODE_ACTIVE) {
@@ -201,7 +201,7 @@ static bool compare_nodes(const bNode *a, const bNode *b)
   for (parent = b->parent; parent; parent = parent->parent) {
     /* if a is an ancestor, it is always behind b */
     if (parent == a) {
-      return 0;
+      return false;
     }
     /* any selected ancestor moves the node forward */
     if (parent->flag & NODE_ACTIVE) {
@@ -214,21 +214,21 @@ static bool compare_nodes(const bNode *a, const bNode *b)
 
   /* if one of the nodes is in the background and the other not */
   if ((a->flag & NODE_BACKGROUND) && !(b->flag & NODE_BACKGROUND)) {
-    return 0;
+    return false;
   }
   if (!(a->flag & NODE_BACKGROUND) && (b->flag & NODE_BACKGROUND)) {
-    return 1;
+    return true;
   }
 
   /* if one has a higher selection state (active > selected > nothing) */
   if (!b_active && a_active) {
-    return 1;
+    return true;
   }
   if (!b_select && (a_active || a_select)) {
-    return 1;
+    return true;
   }
 
-  return 0;
+  return false;
 }
 
 /* Sorts nodes by selection: unselected nodes first, then selected,
diff --git a/source/blender/editors/space_node/node_edit.c b/source/blender/editors/space_node/node_edit.c
index ef931dd9bb8..eae8bd05a93 100644
--- a/source/blender/editors/space_node/node_edit.c
+++ b/source/blender/editors/space_node/node_edit.c
@@ -358,10 +358,10 @@ bool composite_node_active(bContext *C)
   if (ED_operator_node_active(C)) {
     SpaceNode *snode = CTX_wm_space_node(C);
     if (ED_node_is_compositor(snode)) {
-      return 1;
+      return true;
     }
   }
-  return 0;
+  return false;
 }
 
 /* operator poll callback */
@@ -370,10 +370,10 @@ bool composite_node_editable(bContext *C)
   if (ED_operator_node_editable(C)) {
     SpaceNode *snode = CTX_wm_space_node(C);
     if (ED_node_is_compositor(snode)) {
-      return 1;
+      return true;
     }
   }
-  return 0;
+  return false;
 }
 
 void snode_dag_update(bContext *C, SpaceNode *snode)
@@ -1089,21 +1089,21 @@ void NODE_OT_resize(wmOperatorType *ot)
 
 /* ********************** hidden sockets ******************** */
 
-int node_has_hidden_sockets(bNode *node)
+bool node_has_hidden_sockets(bNode *node)
 {
   bNodeSocket *sock;
 
   for (sock = node->inputs.first; sock; sock = sock->next) {
     if (sock->flag & SOCK_HIDDEN) {
-      return 1;
+      return true;
     }
   }
   for (sock = node->outputs.first; sock; sock = sock->next) {
     if (sock->flag & SOCK_HIDDEN) {
-      return 1;
+      return true;
     }
   }
-  return 0;
+  return false;
 }
 
 void node_set_hidden_sockets(SpaceNode *snode, bNode *node, int set)
diff --git a/source/blender/editors/space_node/node_intern.h b/source/blender/editors/space_node/node_intern.h
index 9461892360e..7e62170bce5 100644
--- a/source/blender/editors/space_node/node_intern.h
+++ b/source/blender/editors/space_node/node_intern.h
@@ -212,7 +212,7 @@ void snode_update(struct SpaceNode *snode, struct bNode *node);
 bool composite_node_active(struct bContext *C);
 bool composite_node_editable(struct bContext *C);
 
-int node_has_hidden_sockets(struct bNode *node);
+bool node_has_hidden_sockets(struct bNode *node);
 void node_set_hidden_sockets(struct SpaceNode *snode, bNode *node, int set);
 int node_render_changed_exec(bContext *, struct wmOperator *);
 int node_find_indicated_socket(struct SpaceNode *snode,
diff --git a/source/blender/editors/space_view3d/view3d_utils.c b/source/blender/editors/space_view3d/view3d_utils.c
index a264e1560c6..ffd5c4e182a 100644
--- a/source/blender/editors/space_view3d/view3d_utils.c
+++ b/source/blender/editors/space_view3d/view3d_utils.c
@@ -1077,9 +1077,9 @@ static bool depth_segment_cb(int x, int y, void *userData)
 
   if (depth != FLT_MAX) {
     data->depth = depth;
-    return 0;
+    return false;
   }
-  return 1;
+  return true;
 }
 
 bool ED_view3d_autodist_depth_seg(
diff --git a/source/blender/editors/space_view3d/view3d_view.c b/source/blender/editors/space_view3d/view3d_view.c
index d015b5dcc89..7000a4d89cd 100644
--- a/source/blender/editors/space_view3d/view3d_view.c
+++ b/source/blender/editors/space_view3d/view3d_view.c
@@ -496,13 +496,13 @@ static bool view3d_camera_to_view_poll(bContext *C)
     if (v3d && v3d->camera && !ID_IS_LINKED(v3d->camera)) {
       if (rv3d && (RV3D_LOCK_FLAGS(rv3d) & RV3D_LOCK_ANY_TRANSFORM) == 0) {
         if (rv3d->persp != RV3D_CAMOB) {
-          return 1;
+          return true;
         }
       }
     }
   }
 
-  return 0;
+  return false;
 }
 
 void VIEW3D_OT_camera_to_view(wmOperatorType *ot)