diff --git a/intern/cycles/render/graph.cpp b/intern/cycles/render/graph.cpp
index 45b08832fea..8fd8663b5a4 100644
--- a/intern/cycles/render/graph.cpp
+++ b/intern/cycles/render/graph.cpp
@@ -684,7 +684,7 @@ void ShaderGraph::bump_from_displacement()
 	 * different shifted coordinates.
 	 *
 	 * these 3 displacement values are then fed into the bump node, which will
-	 * output the the perturbed normal. */
+	 * output the perturbed normal. */
 
 	ShaderInput *displacement_in = output()->input("Displacement");
 
diff --git a/intern/ghost/intern/GHOST_Window.h b/intern/ghost/intern/GHOST_Window.h
index e470e40d43a..15b81998aab 100644
--- a/intern/ghost/intern/GHOST_Window.h
+++ b/intern/ghost/intern/GHOST_Window.h
@@ -336,7 +336,7 @@ protected:
 
 	GHOST_TSuccess releaseNativeHandles();
 
-	/** The the of drawing context installed in this window. */
+	/** The drawing context installed in this window. */
 	GHOST_TDrawingContextType m_drawingContextType;
 	
 	/** The window user data */
diff --git a/intern/memutil/MEM_RefCounted.h b/intern/memutil/MEM_RefCounted.h
index 9da0103f6a3..88eaccf9732 100644
--- a/intern/memutil/MEM_RefCounted.h
+++ b/intern/memutil/MEM_RefCounted.h
@@ -41,7 +41,7 @@
  * An object with reference counting.
  * Base class for objects with reference counting.
  * When a shared object is ceated, it has reference count == 1.
- * If the the reference count of a shared object reaches zero, the object self-destructs.
+ * If the reference count of a shared object reaches zero, the object self-destructs.
  * The default destructor of this object has been made protected on purpose.
  * This disables the creation of shared objects on the stack.
  *
@@ -72,7 +72,7 @@ public:
 
 	/** 
 	 * Decreases the reference count of this object.
-	 * If the the reference count reaches zero, the object self-destructs.
+	 * If the reference count reaches zero, the object self-destructs.
 	 * @return the new reference count.
 	 */
 	inline virtual int decRef();
diff --git a/intern/memutil/MEM_RefCountedC-Api.h b/intern/memutil/MEM_RefCountedC-Api.h
index a611482a991..79b0b6efb66 100644
--- a/intern/memutil/MEM_RefCountedC-Api.h
+++ b/intern/memutil/MEM_RefCountedC-Api.h
@@ -64,7 +64,7 @@ extern int	MEM_RefCountedIncRef(MEM_TRefCountedObjectPtr shared);
 
 /** 
  * Decreases the reference count of this object.
- * If the the reference count reaches zero, the object self-destructs.
+ * If the reference count reaches zero, the object self-destructs.
  * @param shared The object to query.
  * @return The new reference count.
  */
diff --git a/source/blender/avi/intern/avi.c b/source/blender/avi/intern/avi.c
index a423c874adf..6ea94d3b2f3 100644
--- a/source/blender/avi/intern/avi.c
+++ b/source/blender/avi/intern/avi.c
@@ -676,7 +676,7 @@ AviError AVI_open_movie(const char *name, AviMovie *movie)
 		 * instead of an offset from the movie beginning... this is...
 		 * wacky, but we need to handle it. The wacky offset always
 		 * starts at movi_offset it seems... so we'll check that.
-		 * Note the the offset needs an extra 4 bytes for some
+		 * Note the offset needs an extra 4 bytes for some
 		 * undetermined reason */
 
 		if (movie->entries[0].Offset == movie->movi_offset)
diff --git a/source/blender/blenkernel/BKE_animsys.h b/source/blender/blenkernel/BKE_animsys.h
index e79822daa4d..a5109acfa56 100644
--- a/source/blender/blenkernel/BKE_animsys.h
+++ b/source/blender/blenkernel/BKE_animsys.h
@@ -106,7 +106,7 @@ void BKE_keyingsets_free(struct ListBase *list);
 /* ************************************* */
 /* Path Fixing API */
 
-/* Fix all the paths for the the given ID + Action */
+/* Fix all the paths for the given ID + Action */
 void BKE_action_fix_paths_rename(struct ID *owner_id, struct bAction *act, const char *prefix, const char *oldName,
                                  const char *newName, int oldSubscript, int newSubscript, bool verify_paths);
 
diff --git a/source/blender/blenkernel/intern/armature.c b/source/blender/blenkernel/intern/armature.c
index 875815d7550..00cfa05d29c 100644
--- a/source/blender/blenkernel/intern/armature.c
+++ b/source/blender/blenkernel/intern/armature.c
@@ -1662,7 +1662,7 @@ static void pose_proxy_synchronize(Object *ob, Object *from, int layer_protected
 			if (pchanw.prop) {
 				pchanw.prop = IDP_CopyProperty(pchanw.prop);
 				
-				/* use the values from the the existing props */
+				/* use the values from the existing props */
 				if (pchan->prop) {
 					IDP_SyncGroupValues(pchanw.prop, pchan->prop);
 				}
diff --git a/source/blender/blenkernel/intern/rigidbody.c b/source/blender/blenkernel/intern/rigidbody.c
index 3d61b0bdefb..2f6ac6cf162 100644
--- a/source/blender/blenkernel/intern/rigidbody.c
+++ b/source/blender/blenkernel/intern/rigidbody.c
@@ -401,7 +401,7 @@ static void rigidbody_validate_sim_shape(Object *ob, bool rebuild)
 		height = size[2];
 	}
 	else if (rbo->shape == RB_SHAPE_SPHERE) {
-		/* take radius to the the largest dimension to try and encompass everything */
+		/* take radius to the largest dimension to try and encompass everything */
 		radius = MAX3(size[0], size[1], size[2]);
 	}
 
@@ -483,7 +483,7 @@ void BKE_rigidbody_calc_volume(Object *ob, float *r_vol)
 		height = size[2];
 	}
 	else if (rbo->shape == RB_SHAPE_SPHERE) {
-		/* take radius to the the largest dimension to try and encompass everything */
+		/* take radius to the largest dimension to try and encompass everything */
 		radius = max_fff(size[0], size[1], size[2]) * 0.5f;
 	}
 
diff --git a/source/blender/blenkernel/intern/softbody.c b/source/blender/blenkernel/intern/softbody.c
index 13575560669..a680d8d2db2 100644
--- a/source/blender/blenkernel/intern/softbody.c
+++ b/source/blender/blenkernel/intern/softbody.c
@@ -3349,7 +3349,7 @@ static void mesh_to_softbody(Scene *scene, Object *ob)
 			build_bps_springlist(ob); /* scan for springs attached to bodypoints ONCE */
 			/* insert *other second order* springs if desired */
 			if (sb->secondspring > 0.0000001f) {
-				add_2nd_order_springs(ob, sb->secondspring); /* exploits the the first run of build_bps_springlist(ob);*/
+				add_2nd_order_springs(ob, sb->secondspring); /* exploits the first run of build_bps_springlist(ob);*/
 				build_bps_springlist(ob); /* yes we need to do it again*/
 			}
 			springs_from_mesh(ob); /* write the 'rest'-length of the springs */
diff --git a/source/blender/blenlib/intern/path_util.c b/source/blender/blenlib/intern/path_util.c
index d5af980e373..e3e13b0bcac 100644
--- a/source/blender/blenlib/intern/path_util.c
+++ b/source/blender/blenlib/intern/path_util.c
@@ -1580,7 +1580,7 @@ void BLI_make_existing_file(const char *name)
 	char di[FILE_MAX];
 	BLI_split_dir_part(name, di, sizeof(di));
 
-	/* make if if the dir doesn't exist */
+	/* make if the dir doesn't exist */
 	BLI_dir_create_recursive(di);
 }
 
diff --git a/source/blender/bmesh/intern/bmesh_mods.c b/source/blender/bmesh/intern/bmesh_mods.c
index 72d25413f09..6687902f77b 100644
--- a/source/blender/bmesh/intern/bmesh_mods.c
+++ b/source/blender/bmesh/intern/bmesh_mods.c
@@ -1149,7 +1149,7 @@ BMEdge *BM_vert_collapse_edge(BMesh *bm, BMEdge *e_kill, BMVert *v_kill,
  * </pre>
  *
  * \param e  The edge to split.
- * \param v  One of the vertices in \a e and defines the the "from" end of the splitting operation,
+ * \param v  One of the vertices in \a e and defines the "from" end of the splitting operation,
  * the new vertex will be \a fac of the way from \a v to the other end.
  * \param r_e  The newly created edge.
  * \return  The new vertex.
diff --git a/source/blender/bmesh/intern/bmesh_queries.c b/source/blender/bmesh/intern/bmesh_queries.c
index 40e0356e14c..f301108a6ae 100644
--- a/source/blender/bmesh/intern/bmesh_queries.c
+++ b/source/blender/bmesh/intern/bmesh_queries.c
@@ -448,7 +448,7 @@ bool BM_verts_in_face(BMFace *f, BMVert **varr, int len)
 }
 
 /**
- * Returns whether or not a given edge is is part of a given face.
+ * Returns whether or not a given edge is part of a given face.
  */
 bool BM_edge_in_face(BMEdge *e, BMFace *f)
 {
diff --git a/source/blender/bmesh/intern/bmesh_queries_inline.h b/source/blender/bmesh/intern/bmesh_queries_inline.h
index 6162af46837..1ca56beb746 100644
--- a/source/blender/bmesh/intern/bmesh_queries_inline.h
+++ b/source/blender/bmesh/intern/bmesh_queries_inline.h
@@ -36,7 +36,7 @@ BLI_INLINE bool BM_vert_in_edge(const BMEdge *e, const BMVert *v)
 }
 
 /**
- * Returns whether or not a given edge is is part of a given loop.
+ * Returns whether or not a given edge is part of a given loop.
  */
 BLI_INLINE bool BM_edge_in_loop(const BMEdge *e, const BMLoop *l)
 {
diff --git a/source/blender/bmesh/intern/bmesh_walkers.c b/source/blender/bmesh/intern/bmesh_walkers.c
index 6a5efbe70ac..20b56632099 100644
--- a/source/blender/bmesh/intern/bmesh_walkers.c
+++ b/source/blender/bmesh/intern/bmesh_walkers.c
@@ -180,7 +180,7 @@ void *BMW_walk(BMWalker *walker)
  * \brief Current Walker State
  *
  * Returns the first state from the walker state
- * worklist. This state is the the next in the
+ * worklist. This state is the next in the
  * worklist for processing.
  */
 void *BMW_current_state(BMWalker *walker)
diff --git a/source/blender/bmesh/intern/bmesh_walkers_impl.c b/source/blender/bmesh/intern/bmesh_walkers_impl.c
index 406dd412d6d..c6829b8d5f1 100644
--- a/source/blender/bmesh/intern/bmesh_walkers_impl.c
+++ b/source/blender/bmesh/intern/bmesh_walkers_impl.c
@@ -738,7 +738,7 @@ static void *bmw_LoopWalker_step(BMWalker *walker)
 		    (owalk.is_single == false && vert_edge_tot > 2) ||
 
 		    /* initial edge was a boundary, so is this edge and vertex is only apart of this face
-		     * this lets us walk over the the boundary of an ngon which is handy */
+		     * this lets us walk over the boundary of an ngon which is handy */
 		    (owalk.is_single == true && vert_edge_tot == 2 && BM_edge_is_boundary(e)))
 		{
 			/* find next boundary edge in the fan */
diff --git a/source/blender/bmesh/operators/bmo_create.c b/source/blender/bmesh/operators/bmo_create.c
index dd814fa8bfb..1c054e89e39 100644
--- a/source/blender/bmesh/operators/bmo_create.c
+++ b/source/blender/bmesh/operators/bmo_create.c
@@ -39,7 +39,7 @@
 
 /* This is what runs when pressing the F key
  * doing the best thing here isn't always easy create vs dissolve, its nice to support
- * but it it _really_ gives issues we might have to not call dissolve. - campbell
+ * but it _really_ gives issues we might have to not call dissolve. - campbell
  */
 void bmo_contextual_create_exec(BMesh *bm, BMOperator *op)
 {
diff --git a/source/blender/bmesh/operators/bmo_similar.c b/source/blender/bmesh/operators/bmo_similar.c
index f779828a00d..4b5eebb2a73 100644
--- a/source/blender/bmesh/operators/bmo_similar.c
+++ b/source/blender/bmesh/operators/bmo_similar.c
@@ -115,7 +115,7 @@ void bmo_similar_faces_exec(BMesh *bm, BMOperator *op)
 	num_total = BM_mesh_elem_count(bm, BM_FACE);
 
 	/*
-	 * The first thing to do is to iterate through all the the selected items and mark them since
+	 * The first thing to do is to iterate through all the selected items and mark them since
 	 * they will be in the selection anyway.
 	 * This will increase performance, (especially when the number of originally selected faces is high)
 	 * so the overall complexity will be less than $O(mn)$ where is the total number of selected faces,
diff --git a/source/blender/bmesh/tools/bmesh_bevel.c b/source/blender/bmesh/tools/bmesh_bevel.c
index 34317866b39..99ff6996b71 100644
--- a/source/blender/bmesh/tools/bmesh_bevel.c
+++ b/source/blender/bmesh/tools/bmesh_bevel.c
@@ -787,7 +787,7 @@ static void offset_on_edge_between(BevelParams *bp, EdgeHalf *e1, EdgeHalf *e2,
  * be on emid if that does a better job of keeping offsets at the user spec.
  * Viewed from the vertex normal side, the CCW order of the edges is e1, emid, e2.
  * The offset lines may not meet exactly: the lines may be angled so that they can't meet.
- * In that case, pick  the the offset_on_edge_between. */
+ * In that case, pick  the offset_on_edge_between. */
 static void offset_in_two_planes(BevelParams *bp, EdgeHalf *e1, EdgeHalf *e2, EdgeHalf *emid,
                                  BMVert *v,  float meetco[3])
 {
@@ -1387,7 +1387,7 @@ static void set_bound_vert_seams(BevVert *bv)
 }
 
 /* Make a circular list of BoundVerts for bv, each of which has the coordinates
- * of a vertex on the the boundary of the beveled vertex bv->v.
+ * of a vertex on the boundary of the beveled vertex bv->v.
  * This may adjust some EdgeHalf widths, and there might have to be
  * a subsequent pass to make the widths as consistent as possible.
  * The first time through, construct will be true and we are making the BoundVerts
diff --git a/source/blender/compositor/operations/COM_ConvertDepthToRadiusOperation.cpp b/source/blender/compositor/operations/COM_ConvertDepthToRadiusOperation.cpp
index ea1443598a9..fa9a957f83c 100644
--- a/source/blender/compositor/operations/COM_ConvertDepthToRadiusOperation.cpp
+++ b/source/blender/compositor/operations/COM_ConvertDepthToRadiusOperation.cpp
@@ -60,7 +60,7 @@ void ConvertDepthToRadiusOperation::initExecution()
 
 	this->m_inputOperation = this->getInputSocketReader(0);
 	float focalDistance = determineFocalDistance();
-	if (focalDistance == 0.0f) focalDistance = 1e10f;  /* if the dof is 0.0 then set it be be far away */
+	if (focalDistance == 0.0f) focalDistance = 1e10f;  /* if the dof is 0.0 then set it to be far away */
 	this->m_inverseFocalDistance = 1.0f / focalDistance;
 	this->m_aspect = (this->getWidth() > this->getHeight()) ? (this->getHeight() / (float)this->getWidth()) : (this->getWidth() / (float)this->getHeight());
 	this->m_aperture = 0.5f * (this->m_cam_lens / (this->m_aspect * cam_sensor)) / this->m_fStop;
diff --git a/source/blender/editors/animation/anim_filter.c b/source/blender/editors/animation/anim_filter.c
index dad25eb04af..b2878d6fe1a 100644
--- a/source/blender/editors/animation/anim_filter.c
+++ b/source/blender/editors/animation/anim_filter.c
@@ -1255,7 +1255,7 @@ static size_t animfilter_nla(bAnimContext *UNUSED(ac), ListBase *anim_data, bDop
 		first = adt->nla_tracks.last;
 	}
 	else {
-		/* first track to include will the the first one (as per normal) */
+		/* first track to include will the first one (as per normal) */
 		first = adt->nla_tracks.first;
 	}
 	
diff --git a/source/blender/editors/animation/keyframes_general.c b/source/blender/editors/animation/keyframes_general.c
index 56165c36efa..6e59bb9f463 100644
--- a/source/blender/editors/animation/keyframes_general.c
+++ b/source/blender/editors/animation/keyframes_general.c
@@ -724,7 +724,7 @@ static void paste_animedit_keys_fcurve(FCurve *fcu, tAnimCopybufItem *aci, float
 		}
 	}
 	
-	/* just start pasting, with the the first keyframe on the current frame, and so on */
+	/* just start pasting, with the first keyframe on the current frame, and so on */
 	for (i = 0, bezt = aci->bezt; i < aci->totvert; i++, bezt++) {
 		/* temporarily apply offset to src beztriple while copying */
 		bezt->vec[0][0] += offset;
diff --git a/source/blender/editors/armature/editarmature_sketch.c b/source/blender/editors/armature/editarmature_sketch.c
index d75a23a6322..c9effe404da 100644
--- a/source/blender/editors/armature/editarmature_sketch.c
+++ b/source/blender/editors/armature/editarmature_sketch.c
@@ -1698,7 +1698,7 @@ int sk_detectCommandGesture(bContext *UNUSED(C), SK_Gesture *gest, SK_Sketch *UN
 	if (gest->nb_segments > 2 && gest->nb_intersections == 2 && gest->nb_self_intersections == 1) {
 		SK_Intersection *isect, *self_isect;
 
-		/* get the the last intersection of the first pair */
+		/* get the last intersection of the first pair */
 		for (isect = gest->intersections.first; isect; isect = isect->next) {
 			if (isect->stroke == isect->next->stroke) {
 				isect = isect->next;
diff --git a/source/blender/editors/armature/pose_edit.c b/source/blender/editors/armature/pose_edit.c
index da68108285f..42fd8e3dee1 100644
--- a/source/blender/editors/armature/pose_edit.c
+++ b/source/blender/editors/armature/pose_edit.c
@@ -595,7 +595,7 @@ void POSE_OT_flip_names(wmOperatorType *ot)
 	/* identifiers */
 	ot->name = "Flip Names";
 	ot->idname = "POSE_OT_flip_names";
-	ot->description = "Flips (and corrects) the axis suffixes of the the names of selected bones";
+	ot->description = "Flips (and corrects) the axis suffixes of the names of selected bones";
 	
 	/* api callbacks */
 	ot->exec = pose_flip_names_exec;
diff --git a/source/blender/editors/include/ED_keyframes_edit.h b/source/blender/editors/include/ED_keyframes_edit.h
index c8365689803..197191b4f96 100644
--- a/source/blender/editors/include/ED_keyframes_edit.h
+++ b/source/blender/editors/include/ED_keyframes_edit.h
@@ -233,7 +233,7 @@ short bezt_selmap_flush(KeyframeEditData *ked, struct BezTriple *bezt);
 
 /* ----------- BezTriple Callback (Assorted Utilities) ---------- */
 
-/* used to calculate the the average location of all relevant BezTriples by summing their locations */
+/* used to calculate the average location of all relevant BezTriples by summing their locations */
 short bezt_calc_average(KeyframeEditData *ked, struct BezTriple *bezt);
 
 /* used to extract a set of cfra-elems from the keyframes */
diff --git a/source/blender/editors/screen/screen_ops.c b/source/blender/editors/screen/screen_ops.c
index 8d9371ef852..ac061752575 100644
--- a/source/blender/editors/screen/screen_ops.c
+++ b/source/blender/editors/screen/screen_ops.c
@@ -412,7 +412,7 @@ int ED_operator_posemode_exclusive(bContext *C)
 }
 
 /* allows for pinned pose objects to be used in the object buttons
- * and the the non-active pose object to be used in the 3D view */
+ * and the non-active pose object to be used in the 3D view */
 int ED_operator_posemode_context(bContext *C)
 {
 	Object *obpose = ED_pose_object_from_context(C);
diff --git a/source/blender/editors/sculpt_paint/paint_image_proj.c b/source/blender/editors/sculpt_paint/paint_image_proj.c
index 304ca8509eb..a488ddad50f 100644
--- a/source/blender/editors/sculpt_paint/paint_image_proj.c
+++ b/source/blender/editors/sculpt_paint/paint_image_proj.c
@@ -3179,7 +3179,7 @@ static void project_paint_begin(ProjPaintState *ps)
 	}
 
 	/* If this border is not added we get artifacts for faces that
-	 * have a parallel edge and at the bounds of the the 2D projected verts eg
+	 * have a parallel edge and at the bounds of the 2D projected verts eg
 	 * - a single screen aligned quad */
 	projMargin = (ps->screenMax[0] - ps->screenMin[0]) * 0.000001f;
 	ps->screenMax[0] += projMargin;
diff --git a/source/blender/editors/transform/transform_conversions.c b/source/blender/editors/transform/transform_conversions.c
index 16c4a87b763..903b8c36e3f 100644
--- a/source/blender/editors/transform/transform_conversions.c
+++ b/source/blender/editors/transform/transform_conversions.c
@@ -2636,7 +2636,7 @@ static void UVsToTransData(SpaceImage *sima, TransData *td, TransData2D *td2d, f
 	/* uv coords are scaled by aspects. this is needed for rotations and
 	 * proportional editing to be consistent with the stretched uv coords
 	 * that are displayed. this also means that for display and numinput,
-	 * and when the the uv coords are flushed, these are converted each time */
+	 * and when the uv coords are flushed, these are converted each time */
 	td2d->loc[0] = uv[0] * aspx;
 	td2d->loc[1] = uv[1] * aspy;
 	td2d->loc[2] = 0.0f;
@@ -6798,7 +6798,7 @@ static void MaskPointToTransData(Scene *scene, MaskSplinePoint *point,
 			/* CV coords are scaled by aspects. this is needed for rotations and
 			 * proportional editing to be consistent with the stretched CV coords
 			 * that are displayed. this also means that for display and numinput,
-			 * and when the the CV coords are flushed, these are converted each time */
+			 * and when the CV coords are flushed, these are converted each time */
 			mul_v2_m3v2(td2d->loc, parent_matrix, bezt->vec[i]);
 			td2d->loc[0] *= asp[0];
 			td2d->loc[1] *= asp[1];
diff --git a/source/blender/freestyle/intern/blender_interface/FRS_freestyle.cpp b/source/blender/freestyle/intern/blender_interface/FRS_freestyle.cpp
index 4dd4598cc91..cfadf80dcf6 100644
--- a/source/blender/freestyle/intern/blender_interface/FRS_freestyle.cpp
+++ b/source/blender/freestyle/intern/blender_interface/FRS_freestyle.cpp
@@ -182,7 +182,7 @@ static void init_camera(Render *re)
 {
 	// It is assumed that imported meshes are in the camera coordinate system.
 	// Therefore, the view point (i.e., camera position) is at the origin, and
-	// the the model-view matrix is simply the identity matrix.
+	// the model-view matrix is simply the identity matrix.
 
 	freestyle_viewpoint[0] = 0.0;
 	freestyle_viewpoint[1] = 0.0;
diff --git a/source/blender/freestyle/intern/stroke/ChainingIterators.h b/source/blender/freestyle/intern/stroke/ChainingIterators.h
index 5d05ed2776d..4ece24c5ecf 100644
--- a/source/blender/freestyle/intern/stroke/ChainingIterators.h
+++ b/source/blender/freestyle/intern/stroke/ChainingIterators.h
@@ -101,7 +101,7 @@ public:
 		return _internalIterator.isBegin();
 	}
 
-	/*! Returns true if the current ViewEdge is is coming towards the iteration vertex. False otherwise. */
+	/*! Returns true if the current ViewEdge is coming towards the iteration vertex. False otherwise. */
 	bool isIncoming() const;
 
 	/*! Returns a *pointer* to the pointed ViewEdge. */
diff --git a/source/blender/freestyle/intern/view_map/FEdgeXDetector.cpp b/source/blender/freestyle/intern/view_map/FEdgeXDetector.cpp
index a5e526fc490..9827ec68c5d 100644
--- a/source/blender/freestyle/intern/view_map/FEdgeXDetector.cpp
+++ b/source/blender/freestyle/intern/view_map/FEdgeXDetector.cpp
@@ -497,7 +497,7 @@ void FEdgeXDetector::ProcessRidgeFace(WXFace *iFace)
 				}
 			}
 		}
-		// Once we have K1 along the the ppal direction compute the derivative : K1b - K1a put it in DotP
+		// Once we have K1 along the ppal direction compute the derivative : K1b - K1a put it in DotP
 		//real d = fabs(K1_b) - fabs(K1_a);
 		real d = 0;
 		real threshold = _meanK1 + (_maxK1 - _meanK1) / 7.0;
diff --git a/source/blender/makesdna/DNA_actuator_types.h b/source/blender/makesdna/DNA_actuator_types.h
index dcde9007cd8..bdf1b62646d 100644
--- a/source/blender/makesdna/DNA_actuator_types.h
+++ b/source/blender/makesdna/DNA_actuator_types.h
@@ -57,7 +57,7 @@ typedef struct bActionActuator {
 	short   blendin;        /* Number of frames of blending */
 	short   priority;       /* Execution priority */
 	short   layer;          /* Animation layer */
-	short   end_reset;      /* Ending the actuator (negative pulse) wont reset the the action to its starting frame */
+	short   end_reset;      /* Ending the actuator (negative pulse) wont reset the action to its starting frame */
 	short   strideaxis;     /* Displacement axis */
 	short   blend_mode;		/* Layer blending mode */
 	float   stridelength;   /* Displacement incurred by cycle */ // not in use
diff --git a/source/blender/makesdna/intern/dna_genfile.c b/source/blender/makesdna/intern/dna_genfile.c
index f60562f1ac9..4615a1ce9e4 100644
--- a/source/blender/makesdna/intern/dna_genfile.c
+++ b/source/blender/makesdna/intern/dna_genfile.c
@@ -92,7 +92,7 @@
  *
  *  While writing a file, the names of a struct is indicated with a type number,
  *  to be found with: ``type = DNA_struct_find_nr(SDNA *, const char *)``
- *  The value of ``type`` corresponds with the the index within the structs array
+ *  The value of ``type`` corresponds with the index within the structs array
  *
  *  For the moment: the complete DNA file is included in a .blend file. For
  *  the future we can think of smarter methods, like only included the used
diff --git a/source/blender/makesrna/intern/makesrna.c b/source/blender/makesrna/intern/makesrna.c
index 9023f25e3d5..9b33e1f5c28 100644
--- a/source/blender/makesrna/intern/makesrna.c
+++ b/source/blender/makesrna/intern/makesrna.c
@@ -1150,7 +1150,7 @@ static char *rna_def_property_lookup_int_func(FILE *f, StructRNA *srna, Property
                                               const char *manualfunc, const char *nextfunc)
 {
 	/* note on indices, this is for external functions and ignores skipped values.
-	 * so the the index can only be checked against the length when there is no 'skip' function. */
+	 * so the index can only be checked against the length when there is no 'skip' function. */
 	char *func;
 
 	if (prop->flag & PROP_IDPROPERTY && manualfunc == NULL)
diff --git a/source/blender/python/bmesh/bmesh_py_geometry.c b/source/blender/python/bmesh/bmesh_py_geometry.c
index 4cd0a3951b3..a48a9dab434 100644
--- a/source/blender/python/bmesh/bmesh_py_geometry.c
+++ b/source/blender/python/bmesh/bmesh_py_geometry.c
@@ -49,7 +49,7 @@ PyDoc_STRVAR(bpy_bm_geometry_intersect_face_point_doc,
 "   :type face: :class:`bmesh.types.BMFace`\n"
 "   :arg point: The point to test.\n"
 "   :type point: float triplet\n"
-"   :return: True when the the point is in the face.\n"
+"   :return: True when the point is in the face.\n"
 "   :rtype: bool\n"
 );
 static PyObject *bpy_bm_geometry_intersect_face_point(BPy_BMFace *UNUSED(self), PyObject *args)
diff --git a/source/blender/windowmanager/intern/wm_playanim.c b/source/blender/windowmanager/intern/wm_playanim.c
index 76add2f9aac..677be734d4b 100644
--- a/source/blender/windowmanager/intern/wm_playanim.c
+++ b/source/blender/windowmanager/intern/wm_playanim.c
@@ -298,8 +298,8 @@ static void playanim_toscreen(PlayState *ps, PlayAnimPict *picture, struct ImBuf
 	glRasterPos2f(offs_x + (ps->draw_flip[0] ? span_x : 0.0f),
 	              offs_y + (ps->draw_flip[1] ? span_y : 0.0f));
 
-	glPixelZoom(ps->zoom * ps->draw_flip[0] ? -1.0f : 1.0f,
-	            ps->zoom * ps->draw_flip[1] ? -1.0f : 1.0f);
+	glPixelZoom(ps->zoom * (ps->draw_flip[0] ? -1.0f : 1.0f),
+	            ps->zoom * (ps->draw_flip[1] ? -1.0f : 1.0f));
 
 	glDrawPixels(ibuf->x, ibuf->y, GL_RGBA, GL_UNSIGNED_BYTE, ibuf->rect);