diff --git a/intern/clog/CLG_log.h b/intern/clog/CLG_log.h
index 8fc887cb1ce..db49da4faeb 100644
--- a/intern/clog/CLG_log.h
+++ b/intern/clog/CLG_log.h
@@ -109,12 +109,12 @@ typedef struct CLG_LogRef {
   struct CLG_LogRef *next;
 } CLG_LogRef;
 
-void CLG_log_str(CLG_LogType *lg,
+void CLG_log_str(const CLG_LogType *lg,
                  enum CLG_Severity severity,
                  const char *file_line,
                  const char *fn,
                  const char *message) _CLOG_ATTR_NONNULL(1, 3, 4, 5);
-void CLG_logf(CLG_LogType *lg,
+void CLG_logf(const CLG_LogType *lg,
               enum CLG_Severity severity,
               const char *file_line,
               const char *fn,
@@ -156,7 +156,7 @@ int CLG_color_support_get(CLG_LogRef *clg_ref);
 
 #define CLOG_AT_SEVERITY(clg_ref, severity, verbose_level, ...) \
   { \
-    CLG_LogType *_lg_ty = CLOG_ENSURE(clg_ref); \
+    const CLG_LogType *_lg_ty = CLOG_ENSURE(clg_ref); \
     if (((_lg_ty->flag & CLG_FLAG_USE) && (_lg_ty->level >= verbose_level)) || \
         (severity >= CLG_SEVERITY_WARN)) \
     { \
@@ -167,7 +167,7 @@ int CLG_color_support_get(CLG_LogRef *clg_ref);
 
 #define CLOG_STR_AT_SEVERITY(clg_ref, severity, verbose_level, str) \
   { \
-    CLG_LogType *_lg_ty = CLOG_ENSURE(clg_ref); \
+    const CLG_LogType *_lg_ty = CLOG_ENSURE(clg_ref); \
     if (((_lg_ty->flag & CLG_FLAG_USE) && (_lg_ty->level >= verbose_level)) || \
         (severity >= CLG_SEVERITY_WARN)) \
     { \
diff --git a/intern/clog/clog.c b/intern/clog/clog.c
index 0b3887e5350..9202861a589 100644
--- a/intern/clog/clog.c
+++ b/intern/clog/clog.c
@@ -429,7 +429,7 @@ static void write_severity(CLogStringBuf *cstr, enum CLG_Severity severity, bool
   }
 }
 
-static void write_type(CLogStringBuf *cstr, CLG_LogType *lg)
+static void write_type(CLogStringBuf *cstr, const CLG_LogType *lg)
 {
   clg_str_append(cstr, " (");
   clg_str_append(cstr, lg->identifier);
@@ -460,7 +460,7 @@ static void write_file_line_fn(CLogStringBuf *cstr,
   clg_str_append(cstr, ": ");
 }
 
-void CLG_log_str(CLG_LogType *lg,
+void CLG_log_str(const CLG_LogType *lg,
                  enum CLG_Severity severity,
                  const char *file_line,
                  const char *fn,
@@ -498,7 +498,7 @@ void CLG_log_str(CLG_LogType *lg,
   }
 }
 
-void CLG_logf(CLG_LogType *lg,
+void CLG_logf(const CLG_LogType *lg,
               enum CLG_Severity severity,
               const char *file_line,
               const char *fn,
diff --git a/source/blender/blenkernel/BKE_customdata_file.h b/source/blender/blenkernel/BKE_customdata_file.h
index e364dca247c..4a527d8cd11 100644
--- a/source/blender/blenkernel/BKE_customdata_file.h
+++ b/source/blender/blenkernel/BKE_customdata_file.h
@@ -28,13 +28,13 @@ void cdf_free(CDataFile *cdf);
 /* File read/write/remove */
 
 bool cdf_read_open(CDataFile *cdf, const char *filepath);
-bool cdf_read_layer(CDataFile *cdf, CDataFileLayer *blay);
+bool cdf_read_layer(CDataFile *cdf, const CDataFileLayer *blay);
 bool cdf_read_data(CDataFile *cdf, unsigned int size, void *data);
 void cdf_read_close(CDataFile *cdf);
 
 bool cdf_write_open(CDataFile *cdf, const char *filepath);
 bool cdf_write_layer(CDataFile *cdf, CDataFileLayer *blay);
-bool cdf_write_data(CDataFile *cdf, unsigned int size, void *data);
+bool cdf_write_data(CDataFile *cdf, unsigned int size, const void *data);
 void cdf_write_close(CDataFile *cdf);
 
 void cdf_remove(const char *filepath);
diff --git a/source/blender/blenkernel/BKE_text.h b/source/blender/blenkernel/BKE_text.h
index 38c07aa4085..64b54341442 100644
--- a/source/blender/blenkernel/BKE_text.h
+++ b/source/blender/blenkernel/BKE_text.h
@@ -65,7 +65,7 @@ void txt_clean_text(struct Text *text);
 void txt_order_cursors(struct Text *text, bool reverse);
 int txt_find_string(struct Text *text, const char *findstr, int wrap, int match_case);
 bool txt_has_sel(const struct Text *text);
-int txt_get_span(struct TextLine *from, struct TextLine *to);
+int txt_get_span(struct TextLine *from, const struct TextLine *to);
 void txt_move_up(struct Text *text, bool sel);
 void txt_move_down(struct Text *text, bool sel);
 void txt_move_left(struct Text *text, bool sel);
@@ -116,8 +116,8 @@ int txt_setcurr_tab_spaces(struct Text *text, int space);
 bool txt_cursor_is_line_start(const struct Text *text);
 bool txt_cursor_is_line_end(const struct Text *text);
 
-int txt_calc_tab_left(struct TextLine *tl, int ch);
-int txt_calc_tab_right(struct TextLine *tl, int ch);
+int txt_calc_tab_left(const struct TextLine *tl, int ch);
+int txt_calc_tab_right(const struct TextLine *tl, int ch);
 
 /**
  * Utility functions, could be moved somewhere more generic but are python/text related.
diff --git a/source/blender/blenkernel/BKE_vfont.hh b/source/blender/blenkernel/BKE_vfont.hh
index 9135e0b14e3..bf26f162543 100644
--- a/source/blender/blenkernel/BKE_vfont.hh
+++ b/source/blender/blenkernel/BKE_vfont.hh
@@ -111,7 +111,7 @@ bool BKE_vfont_to_curve(Object *ob, eEditFontMode mode);
 void BKE_vfont_build_char(Curve *cu,
                           ListBase *nubase,
                           unsigned int character,
-                          CharInfo *info,
+                          const CharInfo *info,
                           float ofsx,
                           float ofsy,
                           float rot,
diff --git a/source/blender/blenkernel/intern/customdata.cc b/source/blender/blenkernel/intern/customdata.cc
index 586819971e5..6194ffdd53e 100644
--- a/source/blender/blenkernel/intern/customdata.cc
+++ b/source/blender/blenkernel/intern/customdata.cc
@@ -4799,7 +4799,7 @@ void CustomData_external_read(CustomData *data, ID *id, eCustomDataMask mask, co
       /* pass */
     }
     else if ((layer->flag & CD_FLAG_EXTERNAL) && typeInfo->read) {
-      CDataFileLayer *blay = cdf_layer_find(cdf, layer->type, layer->name);
+      const CDataFileLayer *blay = cdf_layer_find(cdf, layer->type, layer->name);
 
       if (blay) {
         if (cdf_read_layer(cdf, blay)) {
diff --git a/source/blender/blenkernel/intern/customdata_file.cc b/source/blender/blenkernel/intern/customdata_file.cc
index 38b4d38c4a9..79bdfbe719a 100644
--- a/source/blender/blenkernel/intern/customdata_file.cc
+++ b/source/blender/blenkernel/intern/customdata_file.cc
@@ -295,7 +295,7 @@ bool cdf_read_open(CDataFile *cdf, const char *filepath)
   return true;
 }
 
-bool cdf_read_layer(CDataFile *cdf, CDataFileLayer *blay)
+bool cdf_read_layer(CDataFile *cdf, const CDataFileLayer *blay)
 {
   size_t offset;
   int a;
@@ -387,7 +387,7 @@ bool cdf_write_layer(CDataFile * /*cdf*/, CDataFileLayer * /*blay*/)
   return true;
 }
 
-bool cdf_write_data(CDataFile *cdf, uint size, void *data)
+bool cdf_write_data(CDataFile *cdf, uint size, const void *data)
 {
   /* write data */
   if (!fwrite(data, size, 1, cdf->writef)) {
diff --git a/source/blender/blenkernel/intern/text.cc b/source/blender/blenkernel/intern/text.cc
index 3e53bdcefda..5942499a13d 100644
--- a/source/blender/blenkernel/intern/text.cc
+++ b/source/blender/blenkernel/intern/text.cc
@@ -673,7 +673,7 @@ void txt_clean_text(Text *text)
   }
 }
 
-int txt_get_span(TextLine *from, TextLine *to)
+int txt_get_span(TextLine *from, const TextLine *to)
 {
   int ret = 0;
   TextLine *tmp = from;
@@ -825,7 +825,7 @@ void txt_move_down(Text *text, const bool sel)
   }
 }
 
-int txt_calc_tab_left(TextLine *tl, int ch)
+int txt_calc_tab_left(const TextLine *tl, int ch)
 {
   /* do nice left only if there are only spaces */
 
@@ -845,7 +845,7 @@ int txt_calc_tab_left(TextLine *tl, int ch)
   return tabsize;
 }
 
-int txt_calc_tab_right(TextLine *tl, int ch)
+int txt_calc_tab_right(const TextLine *tl, int ch)
 {
   if (tl->line[ch] == ' ') {
     int i;
diff --git a/source/blender/blenkernel/intern/vfont.cc b/source/blender/blenkernel/intern/vfont.cc
index 06b920300a0..c2f596ed6bf 100644
--- a/source/blender/blenkernel/intern/vfont.cc
+++ b/source/blender/blenkernel/intern/vfont.cc
@@ -405,7 +405,7 @@ VFont *BKE_vfont_load_exists(Main *bmain, const char *filepath)
   return BKE_vfont_load_exists_ex(bmain, filepath, nullptr);
 }
 
-static VFont *which_vfont(Curve *cu, CharInfo *info)
+static VFont *which_vfont(Curve *cu, const CharInfo *info)
 {
   switch (info->flag & (CU_CHINFO_BOLD | CU_CHINFO_ITALIC)) {
     case CU_CHINFO_BOLD:
@@ -435,7 +435,7 @@ VFont *BKE_vfont_builtin_get()
   return vfont;
 }
 
-static VChar *find_vfont_char(VFontData *vfd, uint character)
+static VChar *find_vfont_char(const VFontData *vfd, uint character)
 {
   return static_cast<VChar *>(BLI_ghash_lookup(vfd->characters, POINTER_FROM_UINT(character)));
 }
@@ -507,7 +507,7 @@ static void build_underline(Curve *cu,
 void BKE_vfont_build_char(Curve *cu,
                           ListBase *nubase,
                           uint character,
-                          CharInfo *info,
+                          const CharInfo *info,
                           float ofsx,
                           float ofsy,
                           float rot,
@@ -679,7 +679,7 @@ void BKE_vfont_select_clamp(Object *ob)
   CLAMP_MAX(ef->selend, ef->len);
 }
 
-static float char_width(Curve *cu, VChar *che, CharInfo *info)
+static float char_width(Curve *cu, VChar *che, const CharInfo *info)
 {
   /* The character wasn't found, probably ascii = 0, then the width shall be 0 as well */
   if (che == nullptr) {
diff --git a/source/blender/blenlib/BLI_args.h b/source/blender/blenlib/BLI_args.h
index 8ae2148ec09..50a4ed54468 100644
--- a/source/blender/blenlib/BLI_args.h
+++ b/source/blender/blenlib/BLI_args.h
@@ -69,7 +69,7 @@ void BLI_args_print_other_doc(struct bArgs *ba);
 
 bool BLI_args_has_other_doc(const struct bArgs *ba);
 
-void BLI_args_print(struct bArgs *ba);
+void BLI_args_print(const struct bArgs *ba);
 
 #ifdef __cplusplus
 }
diff --git a/source/blender/blenlib/BLI_rand.h b/source/blender/blenlib/BLI_rand.h
index 8aca93264bd..7c7743716a3 100644
--- a/source/blender/blenlib/BLI_rand.h
+++ b/source/blender/blenlib/BLI_rand.h
@@ -32,7 +32,7 @@ struct RNG *BLI_rng_new(unsigned int seed);
  * A version of #BLI_rng_new that hashes the seed.
  */
 struct RNG *BLI_rng_new_srandom(unsigned int seed);
-struct RNG *BLI_rng_copy(struct RNG *rng) ATTR_NONNULL(1);
+struct RNG *BLI_rng_copy(const struct RNG *rng) ATTR_NONNULL(1);
 void BLI_rng_free(struct RNG *rng) ATTR_NONNULL(1);
 
 void BLI_rng_seed(struct RNG *rng, unsigned int seed) ATTR_NONNULL(1);
diff --git a/source/blender/blenlib/intern/BLI_args.c b/source/blender/blenlib/intern/BLI_args.c
index 50eb0945ec6..0050d8e5f2d 100644
--- a/source/blender/blenlib/intern/BLI_args.c
+++ b/source/blender/blenlib/intern/BLI_args.c
@@ -152,7 +152,7 @@ void BLI_args_pass_set(bArgs *ba, int current_pass)
   ba->current_pass = current_pass;
 }
 
-void BLI_args_print(bArgs *ba)
+void BLI_args_print(const bArgs *ba)
 {
   int i;
   for (i = 0; i < ba->argc; i++) {
diff --git a/source/blender/blenlib/intern/BLI_kdopbvh.c b/source/blender/blenlib/intern/BLI_kdopbvh.c
index be3a8aeee6a..f11e13cf1aa 100644
--- a/source/blender/blenlib/intern/BLI_kdopbvh.c
+++ b/source/blender/blenlib/intern/BLI_kdopbvh.c
@@ -258,7 +258,7 @@ static void bvh_insertionsort(BVHNode **a, int lo, int hi, int axis)
   }
 }
 
-static int bvh_partition(BVHNode **a, int lo, int hi, BVHNode *x, int axis)
+static int bvh_partition(BVHNode **a, int lo, int hi, const BVHNode *x, int axis)
 {
   int i = lo, j = hi;
   while (1) {
diff --git a/source/blender/blenlib/intern/rand.cc b/source/blender/blenlib/intern/rand.cc
index a1ec6550c9b..9a11e8157d8 100644
--- a/source/blender/blenlib/intern/rand.cc
+++ b/source/blender/blenlib/intern/rand.cc
@@ -50,7 +50,7 @@ RNG *BLI_rng_new_srandom(uint seed)
   return rng;
 }
 
-RNG *BLI_rng_copy(RNG *rng)
+RNG *BLI_rng_copy(const RNG *rng)
 {
   return new RNG(*rng);
 }
diff --git a/source/blender/blenloader/intern/versioning_userdef.cc b/source/blender/blenloader/intern/versioning_userdef.cc
index 5ac450fccf8..05565e8d677 100644
--- a/source/blender/blenloader/intern/versioning_userdef.cc
+++ b/source/blender/blenloader/intern/versioning_userdef.cc
@@ -155,7 +155,7 @@ static void do_versions_theme(const UserDef *userdef, bTheme *btheme)
 /** #UserDef.flag */
 #define USER_LMOUSESELECT (1 << 14) /* deprecated */
 
-static void do_version_select_mouse(UserDef *userdef, wmKeyMapItem *kmi)
+static void do_version_select_mouse(const UserDef *userdef, wmKeyMapItem *kmi)
 {
   /* Remove select/action mouse from user defined keymaps. */
   enum {
diff --git a/source/blender/editors/animation/anim_markers.cc b/source/blender/editors/animation/anim_markers.cc
index a7b6cd54f5c..f72827ffe75 100644
--- a/source/blender/editors/animation/anim_markers.cc
+++ b/source/blender/editors/animation/anim_markers.cc
@@ -509,7 +509,7 @@ static void draw_marker(const uiFontStyle *fstyle,
   draw_marker_name(text_color, fstyle, marker, xpos, xmax, name_y);
 }
 
-static void draw_markers_background(rctf *rect)
+static void draw_markers_background(const rctf *rect)
 {
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
   immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
diff --git a/source/blender/editors/gpencil_legacy/gpencil_select.cc b/source/blender/editors/gpencil_legacy/gpencil_select.cc
index 773ca679427..2758b54ff73 100644
--- a/source/blender/editors/gpencil_legacy/gpencil_select.cc
+++ b/source/blender/editors/gpencil_legacy/gpencil_select.cc
@@ -1574,7 +1574,7 @@ static bool gpencil_do_curve_circle_sel(bContext *C,
                                         const int my,
                                         const int radius,
                                         const bool select,
-                                        rcti *rect,
+                                        const rcti *rect,
                                         const float diff_mat[4][4],
                                         const int selectmode)
 {
diff --git a/source/blender/editors/include/ED_numinput.hh b/source/blender/editors/include/ED_numinput.hh
index 7a7576a1097..5b281abbe3d 100644
--- a/source/blender/editors/include/ED_numinput.hh
+++ b/source/blender/editors/include/ED_numinput.hh
@@ -80,7 +80,7 @@ void initNumInput(NumInput *n);
 /**
  * \param str: Must be NUM_STR_REP_LEN * (idx_max + 1) length.
  */
-void outputNumInput(NumInput *n, char *str, UnitSettings *unit_settings);
+void outputNumInput(NumInput *n, char *str, const UnitSettings *unit_settings);
 bool hasNumInput(const NumInput *n);
 /**
  * \warning \a vec must be set beforehand otherwise we risk uninitialized vars.
diff --git a/source/blender/editors/include/ED_util.hh b/source/blender/editors/include/ED_util.hh
index 224bcae5b65..6d9b1e06589 100644
--- a/source/blender/editors/include/ED_util.hh
+++ b/source/blender/editors/include/ED_util.hh
@@ -87,7 +87,7 @@ void ED_slider_status_string_get(const tSlider *slider,
                                  char *status_string,
                                  size_t size_of_status_string);
 
-float ED_slider_factor_get(tSlider *slider);
+float ED_slider_factor_get(const tSlider *slider);
 void ED_slider_factor_set(tSlider *slider, float factor);
 
 /** One bool value for each side of the slider. Allows to enable overshoot only on one side. */
@@ -98,11 +98,11 @@ void ED_slider_allow_overshoot_set(tSlider *slider, bool lower, bool upper);
  */
 void ED_slider_factor_bounds_set(tSlider *slider, float lower_bound, float upper_bound);
 
-bool ED_slider_allow_increments_get(tSlider *slider);
+bool ED_slider_allow_increments_get(const tSlider *slider);
 void ED_slider_allow_increments_set(tSlider *slider, bool value);
 
 void ED_slider_mode_set(tSlider *slider, SliderMode mode);
-SliderMode ED_slider_mode_get(tSlider *slider);
+SliderMode ED_slider_mode_get(const tSlider *slider);
 void ED_slider_unit_set(tSlider *slider, const char *unit);
 
 /* ************** XXX OLD CRUFT WARNING ************* */
diff --git a/source/blender/editors/include/ED_view3d.hh b/source/blender/editors/include/ED_view3d.hh
index b022b48a207..d4bfe26e4ac 100644
--- a/source/blender/editors/include/ED_view3d.hh
+++ b/source/blender/editors/include/ED_view3d.hh
@@ -148,7 +148,7 @@ void ED_view3d_from_m4(const float mat[4][4], float ofs[3], float quat[4], const
  * \param lens: The view lens angle set for cameras and lights, normally from View3D.lens.
  */
 void ED_view3d_from_object(
-    const Object *ob, float ofs[3], float quat[4], float *dist, float *lens);
+    const Object *ob, float ofs[3], float quat[4], const float *dist, float *lens);
 /**
  * Set the object transformation from #RegionView3D members.
  * \param depsgraph: The depsgraph to get the evaluated object parent
diff --git a/source/blender/editors/interface/interface_draw.cc b/source/blender/editors/interface/interface_draw.cc
index 99bc6c5b1da..cd76cc91da5 100644
--- a/source/blender/editors/interface/interface_draw.cc
+++ b/source/blender/editors/interface/interface_draw.cc
@@ -589,7 +589,7 @@ void ui_draw_but_HISTOGRAM(ARegion * /*region*/,
 
 #undef HISTOGRAM_TOT_GRID_LINES
 
-static void waveform_draw_one(float *waveform, int waveform_num, const float col[3])
+static void waveform_draw_one(const float *waveform, int waveform_num, const float col[3])
 {
   GPUVertFormat format = {0};
   const uint pos_id = GPU_vertformat_attr_add(&format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
@@ -609,7 +609,7 @@ static void waveform_draw_one(float *waveform, int waveform_num, const float col
   GPU_batch_discard(batch);
 }
 
-static void waveform_draw_rgb(float *waveform, int waveform_num, float *col)
+static void waveform_draw_rgb(const float *waveform, int waveform_num, const float *col)
 {
   GPUVertFormat format = {0};
   const uint pos_id = GPU_vertformat_attr_add(&format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
@@ -629,7 +629,7 @@ static void waveform_draw_rgb(float *waveform, int waveform_num, float *col)
   GPU_batch_discard(batch);
 }
 
-static void circle_draw_rgb(float *points, int tot_points, float *col, GPUPrimType prim)
+static void circle_draw_rgb(float *points, int tot_points, const float *col, GPUPrimType prim)
 {
   GPUVertFormat format = {0};
   const uint pos_id = GPU_vertformat_attr_add(&format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
diff --git a/source/blender/editors/interface/templates/interface_template_search_menu.cc b/source/blender/editors/interface/templates/interface_template_search_menu.cc
index 778dd329f4e..183fed4fbdc 100644
--- a/source/blender/editors/interface/templates/interface_template_search_menu.cc
+++ b/source/blender/editors/interface/templates/interface_template_search_menu.cc
@@ -144,7 +144,7 @@ static const char *strdup_memarena(MemArena *memarena, const char *str)
   return str_dst;
 }
 
-static const char *strdup_memarena_from_dynstr(MemArena *memarena, DynStr *dyn_str)
+static const char *strdup_memarena_from_dynstr(MemArena *memarena, const DynStr *dyn_str)
 {
   const uint str_size = BLI_dynstr_get_len(dyn_str) + 1;
   char *str_dst = (char *)BLI_memarena_alloc(memarena, str_size);
diff --git a/source/blender/editors/render/render_preview.cc b/source/blender/editors/render/render_preview.cc
index ba5180ba6a0..e7720326ee2 100644
--- a/source/blender/editors/render/render_preview.cc
+++ b/source/blender/editors/render/render_preview.cc
@@ -643,7 +643,7 @@ static Scene *preview_prepare_scene(
 /* new UI convention: draw is in pixel space already. */
 /* uses UI_BTYPE_ROUNDBOX button in block to get the rect */
 static bool ed_preview_draw_rect(
-    Scene *scene, ScrArea *area, int split, int first, rcti *rect, rcti *newrect)
+    Scene *scene, ScrArea *area, int split, int first, const rcti *rect, rcti *newrect)
 {
   Render *re;
   RenderView *rv;
diff --git a/source/blender/editors/sculpt_paint/paint_image_2d.cc b/source/blender/editors/sculpt_paint/paint_image_2d.cc
index f8f2735aa5f..4aac396719c 100644
--- a/source/blender/editors/sculpt_paint/paint_image_2d.cc
+++ b/source/blender/editors/sculpt_paint/paint_image_2d.cc
@@ -191,7 +191,7 @@ static void brush_painter_cache_2d_free(BrushPainterCache *cache)
   }
 }
 
-static void brush_imbuf_tex_co(rctf *mapping, int x, int y, float texco[3])
+static void brush_imbuf_tex_co(const rctf *mapping, int x, int y, float texco[3])
 {
   texco[0] = mapping->xmin + x * mapping->xmax;
   texco[1] = mapping->ymin + y * mapping->ymax;
diff --git a/source/blender/editors/space_graph/graph_slider_ops.cc b/source/blender/editors/space_graph/graph_slider_ops.cc
index cd5c665fea7..0266658d96e 100644
--- a/source/blender/editors/space_graph/graph_slider_ops.cc
+++ b/source/blender/editors/space_graph/graph_slider_ops.cc
@@ -2025,8 +2025,8 @@ struct tBtwOperatorData {
   ListBase anim_data;     /* bAnimListElem */
 };
 
-static int btw_calculate_sample_count(BezTriple *right_bezt,
-                                      BezTriple *left_bezt,
+static int btw_calculate_sample_count(const BezTriple *right_bezt,
+                                      const BezTriple *left_bezt,
                                       const int filter_order,
                                       const int samples_per_frame)
 {
diff --git a/source/blender/editors/space_sequencer/sequencer_retiming_draw.cc b/source/blender/editors/space_sequencer/sequencer_retiming_draw.cc
index 574ac69e732..7a17787f07d 100644
--- a/source/blender/editors/space_sequencer/sequencer_retiming_draw.cc
+++ b/source/blender/editors/space_sequencer/sequencer_retiming_draw.cc
@@ -509,7 +509,7 @@ static size_t label_str_get(const Sequence *seq,
 static bool label_rect_get(const bContext *C,
                            const Sequence *seq,
                            const SeqRetimingKey *key,
-                           char *label_str,
+                           const char *label_str,
                            const size_t label_len,
                            rctf *rect)
 {
diff --git a/source/blender/editors/space_sequencer/sequencer_thumbnails.cc b/source/blender/editors/space_sequencer/sequencer_thumbnails.cc
index 473fa07861e..9ee44ae9d7f 100644
--- a/source/blender/editors/space_sequencer/sequencer_thumbnails.cc
+++ b/source/blender/editors/space_sequencer/sequencer_thumbnails.cc
@@ -37,7 +37,7 @@ struct ThumbnailDrawJob {
   SeqRenderData context;
   GHash *sequences_ghash;
   Scene *scene;
-  rctf *view_area;
+  const rctf *view_area;
   float pixelx;
   float pixely;
   float thumb_height;
@@ -59,7 +59,7 @@ static void thumbnail_freejob(void *data)
 {
   ThumbnailDrawJob *tj = static_cast<ThumbnailDrawJob *>(data);
   BLI_ghash_free(tj->sequences_ghash, nullptr, thumbnail_hash_data_free);
-  MEM_freeN(tj->view_area);
+  MEM_freeN((void *)tj->view_area);
   MEM_freeN(tj);
 }
 
@@ -69,7 +69,7 @@ static void thumbnail_endjob(void *data)
   WM_main_add_notifier(NC_SCENE | ND_SEQUENCER, tj->scene);
 }
 
-static bool check_seq_need_thumbnails(const Scene *scene, Sequence *seq, rctf *view_area)
+static bool check_seq_need_thumbnails(const Scene *scene, Sequence *seq, const rctf *view_area)
 {
   if (!ELEM(seq->type, SEQ_TYPE_MOVIE, SEQ_TYPE_IMAGE)) {
     return false;
diff --git a/source/blender/editors/space_text/text_draw.cc b/source/blender/editors/space_text/text_draw.cc
index 1f06d5ac28e..399e43ef93a 100644
--- a/source/blender/editors/space_text/text_draw.cc
+++ b/source/blender/editors/space_text/text_draw.cc
@@ -1013,7 +1013,7 @@ static void calc_text_rcts(SpaceText *st, ARegion *region, rcti *scroll, rcti *b
   CLAMP(st->runtime->scroll_region_select.ymax, pix_bottom_margin, region->winy - pix_top_margin);
 }
 
-static void draw_textscroll(const SpaceText *st, rcti *scroll, rcti *back)
+static void draw_textscroll(const SpaceText *st, const rcti *scroll, const rcti *back)
 {
   bTheme *btheme = UI_GetTheme();
   uiWidgetColors wcol = btheme->tui.wcol_scroll;
diff --git a/source/blender/editors/space_view3d/view3d_utils.cc b/source/blender/editors/space_view3d/view3d_utils.cc
index 309049d9956..70c55cb79fc 100644
--- a/source/blender/editors/space_view3d/view3d_utils.cc
+++ b/source/blender/editors/space_view3d/view3d_utils.cc
@@ -1572,7 +1572,8 @@ void ED_view3d_to_m4(float mat[4][4], const float ofs[3], const float quat[4], c
   sub_v3_v3v3(mat[3], dvec, ofs);
 }
 
-void ED_view3d_from_object(const Object *ob, float ofs[3], float quat[4], float *dist, float *lens)
+void ED_view3d_from_object(
+    const Object *ob, float ofs[3], float quat[4], const float *dist, float *lens)
 {
   ED_view3d_from_m4(ob->object_to_world().ptr(), ofs, quat, dist);
 
diff --git a/source/blender/editors/transform/transform_snap_animation.cc b/source/blender/editors/transform/transform_snap_animation.cc
index abee64eb0d9..1e3a57e5097 100644
--- a/source/blender/editors/transform/transform_snap_animation.cc
+++ b/source/blender/editors/transform/transform_snap_animation.cc
@@ -117,7 +117,7 @@ static void invert_snap(eSnapMode &snap_mode)
 /* WORKAROUND: The source position is based on the transformed elements.
  * However, at this stage, the transformation has not yet been applied.
  * So apply the transformation here. */
-static float2 nla_transform_apply(TransInfo *t, float *vec, float2 &ival)
+static float2 nla_transform_apply(TransInfo *t, const float *vec, float2 &ival)
 {
   float4x4 mat = float4x4::identity();
 
diff --git a/source/blender/editors/util/ed_draw.cc b/source/blender/editors/util/ed_draw.cc
index 1e8474735f5..9e446b0e33a 100644
--- a/source/blender/editors/util/ed_draw.cc
+++ b/source/blender/editors/util/ed_draw.cc
@@ -531,7 +531,7 @@ void ED_slider_destroy(bContext *C, tSlider *slider)
 
 /* Setters & Getters */
 
-float ED_slider_factor_get(tSlider *slider)
+float ED_slider_factor_get(const tSlider *slider)
 {
   return slider->factor;
 }
@@ -551,7 +551,7 @@ void ED_slider_allow_overshoot_set(tSlider *slider, const bool lower, const bool
   slider->allow_overshoot_upper = upper;
 }
 
-bool ED_slider_allow_increments_get(tSlider *slider)
+bool ED_slider_allow_increments_get(const tSlider *slider)
 {
   return slider->allow_increments;
 }
@@ -574,7 +574,7 @@ void ED_slider_mode_set(tSlider *slider, SliderMode mode)
   slider->slider_mode = mode;
 }
 
-SliderMode ED_slider_mode_get(tSlider *slider)
+SliderMode ED_slider_mode_get(const tSlider *slider)
 {
   return slider->slider_mode;
 }
diff --git a/source/blender/editors/util/numinput.cc b/source/blender/editors/util/numinput.cc
index 53d06bf1306..925d805e582 100644
--- a/source/blender/editors/util/numinput.cc
+++ b/source/blender/editors/util/numinput.cc
@@ -85,7 +85,7 @@ void initNumInput(NumInput *n)
   n->str_cur = 0;
 }
 
-void outputNumInput(NumInput *n, char *str, UnitSettings *unit_settings)
+void outputNumInput(NumInput *n, char *str, const UnitSettings *unit_settings)
 {
   short j;
   const int ln = NUM_STR_REP_LEN;
diff --git a/source/blender/editors/uvedit/uvedit_clipboard_graph_iso.cc b/source/blender/editors/uvedit/uvedit_clipboard_graph_iso.cc
index a2227a7c73d..5f40a9d39ab 100644
--- a/source/blender/editors/uvedit/uvedit_clipboard_graph_iso.cc
+++ b/source/blender/editors/uvedit/uvedit_clipboard_graph_iso.cc
@@ -249,8 +249,11 @@ static uint8_t find_min_value(const uint8_t *arr, uint8_t start_idx, uint8_t len
   return min_v;
 }
 
-static void select_bidomain(
-    uint8_t domains[][BDS], int bd_pos, uint8_t *left, int current_matching_size, bool connected)
+static void select_bidomain(uint8_t domains[][BDS],
+                            int bd_pos,
+                            const uint8_t *left,
+                            int current_matching_size,
+                            bool connected)
 {
   int i;
   int min_size = INT_MAX;
diff --git a/source/blender/geometry/intern/uv_pack.cc b/source/blender/geometry/intern/uv_pack.cc
index 15d3198840a..ce39beb94b0 100644
--- a/source/blender/geometry/intern/uv_pack.cc
+++ b/source/blender/geometry/intern/uv_pack.cc
@@ -2189,7 +2189,7 @@ class OverlapMerger {
   }
 
   /** Return a new root of the binary tree, with `a` and `b` as leaves. */
-  static PackIsland *merge_islands(PackIsland *a, PackIsland *b)
+  static PackIsland *merge_islands(const PackIsland *a, const PackIsland *b)
   {
     PackIsland *result = new PackIsland();
     result->aspect_y = sqrtf(a->aspect_y * b->aspect_y);
diff --git a/source/blender/geometry/intern/uv_parametrizer.cc b/source/blender/geometry/intern/uv_parametrizer.cc
index dd2af9f9e53..9f3c0eded08 100644
--- a/source/blender/geometry/intern/uv_parametrizer.cc
+++ b/source/blender/geometry/intern/uv_parametrizer.cc
@@ -1234,7 +1234,7 @@ static void p_chart_fill_boundary(ParamHandle *handle, PChart *chart, PEdge *be,
   BLI_heap_free(heap, nullptr);
 }
 
-static void p_chart_fill_boundaries(ParamHandle *handle, PChart *chart, PEdge *outer)
+static void p_chart_fill_boundaries(ParamHandle *handle, PChart *chart, const PEdge *outer)
 {
   PEdge *e, *be; /* *enext - as yet unused */
   int nedges;
diff --git a/source/blender/gpu/GPU_batch.hh b/source/blender/gpu/GPU_batch.hh
index f727a0d9a0c..8d85c6f52f2 100644
--- a/source/blender/gpu/GPU_batch.hh
+++ b/source/blender/gpu/GPU_batch.hh
@@ -243,7 +243,7 @@ void GPU_batch_elembuf_set(blender::gpu::Batch *batch,
  * Returns true if the #GPUbatch has \a vertex_buf in its vertex buffer list.
  * \note The search is only conducted on the non-instance rate vertex buffer list.
  */
-bool GPU_batch_vertbuf_has(blender::gpu::Batch *batch, blender::gpu::VertBuf *vertex_buf);
+bool GPU_batch_vertbuf_has(const blender::gpu::Batch *batch, blender::gpu::VertBuf *vertex_buf);
 
 /**
  * Set resource id buffer to bind as instance attribute to workaround the lack of gl_BaseInstance
diff --git a/source/blender/gpu/intern/gpu_batch.cc b/source/blender/gpu/intern/gpu_batch.cc
index b764af15cb7..a7cd8f82787 100644
--- a/source/blender/gpu/intern/gpu_batch.cc
+++ b/source/blender/gpu/intern/gpu_batch.cc
@@ -204,7 +204,7 @@ int GPU_batch_vertbuf_add(Batch *batch, VertBuf *vertex_buf, bool own_vbo)
   return -1;
 }
 
-bool GPU_batch_vertbuf_has(Batch *batch, VertBuf *vertex_buf)
+bool GPU_batch_vertbuf_has(const Batch *batch, VertBuf *vertex_buf)
 {
   for (uint v = 0; v < GPU_BATCH_VBO_MAX_LEN; v++) {
     if (batch->verts[v] == vertex_buf) {
diff --git a/source/blender/imbuf/intern/colormanagement.cc b/source/blender/imbuf/intern/colormanagement.cc
index b35301ea337..cc027218534 100644
--- a/source/blender/imbuf/intern/colormanagement.cc
+++ b/source/blender/imbuf/intern/colormanagement.cc
@@ -1060,7 +1060,9 @@ void IMB_colormanagement_init_default_view_settings(
   view_settings->curve_mapping = nullptr;
 }
 
-static void curve_mapping_apply_pixel(CurveMapping *curve_mapping, float *pixel, int channels)
+static void curve_mapping_apply_pixel(const CurveMapping *curve_mapping,
+                                      float *pixel,
+                                      int channels)
 {
   if (channels == 1) {
     pixel[0] = BKE_curvemap_evaluateF(curve_mapping, curve_mapping->cm, pixel[0]);
diff --git a/source/blender/imbuf/intern/iris.cc b/source/blender/imbuf/intern/iris.cc
index a5fef4e27a1..41e6fff9855 100644
--- a/source/blender/imbuf/intern/iris.cc
+++ b/source/blender/imbuf/intern/iris.cc
@@ -88,13 +88,13 @@ struct MFileOffset {
 
 /* Functions. */
 static void readheader(MFileOffset *inf, IMAGE *image);
-static int writeheader(FILE *outf, IMAGE *image);
+static int writeheader(FILE *outf, const IMAGE *image);
 
 static ushort getshort(MFileOffset *inf);
 static uint getlong(MFileOffset *mofs);
 static void putshort(FILE *outf, ushort val);
 static int putlong(FILE *outf, uint val);
-static int writetab(FILE *outf, uint *tab, int len);
+static int writetab(FILE *outf, const uint *tab, int len);
 static void readtab(MFileOffset *inf, uint *tab, int len);
 
 static int expandrow(
@@ -161,7 +161,7 @@ static void readheader(MFileOffset *inf, IMAGE *image)
   image->zsize = getshort(inf);
 }
 
-static int writeheader(FILE *outf, IMAGE *image)
+static int writeheader(FILE *outf, const IMAGE *image)
 {
   IMAGE t = {0};
 
@@ -179,7 +179,7 @@ static int writeheader(FILE *outf, IMAGE *image)
   return fwrite("no name", 8, 1, outf);
 }
 
-static int writetab(FILE *outf, uint *tab, int len)
+static int writetab(FILE *outf, const uint *tab, int len)
 {
   int r = 0;
 
diff --git a/source/blender/render/intern/render_result.cc b/source/blender/render/intern/render_result.cc
index bfb03cabd27..8a9b26b8f6f 100644
--- a/source/blender/render/intern/render_result.cc
+++ b/source/blender/render/intern/render_result.cc
@@ -1027,7 +1027,7 @@ void render_result_exr_file_cache_write(Render *re)
 {
   RenderResult *rr = re->result;
   char str[FILE_CACHE_MAX];
-  char *root = U.render_cachedir;
+  const char *root = U.render_cachedir;
 
   render_result_passes_allocated_ensure(rr);
 
@@ -1041,7 +1041,7 @@ bool render_result_exr_file_cache_read(Render *re)
 {
   /* File path to cache. */
   char filepath[FILE_CACHE_MAX] = "";
-  char *root = U.render_cachedir;
+  const char *root = U.render_cachedir;
   render_result_exr_file_cache_path(re->scene, root, filepath);
 
   printf("read exr cache file: %s\n", filepath);
diff --git a/source/blender/sequencer/intern/disk_cache.cc b/source/blender/sequencer/intern/disk_cache.cc
index 0c698c449a2..a5cf6fc98b8 100644
--- a/source/blender/sequencer/intern/disk_cache.cc
+++ b/source/blender/sequencer/intern/disk_cache.cc
@@ -97,7 +97,7 @@ struct DiskCacheFile {
 
 static ThreadMutex cache_create_lock = BLI_MUTEX_INITIALIZER;
 
-static char *seq_disk_cache_base_dir()
+static const char *seq_disk_cache_base_dir()
 {
   return U.sequencer_disk_cache_dir;
 }
@@ -152,7 +152,7 @@ static DiskCacheFile *seq_disk_cache_add_file_to_list(SeqDiskCache *disk_cache,
   return cache_file;
 }
 
-static void seq_disk_cache_get_files(SeqDiskCache *disk_cache, char *dirpath)
+static void seq_disk_cache_get_files(SeqDiskCache *disk_cache, const char *dirpath)
 {
   direntry *filelist, *fl;
   uint i;
@@ -329,7 +329,7 @@ static void seq_disk_cache_get_file_path(SeqDiskCache *disk_cache,
   BLI_path_append(filepath, filepath_maxncpy, cache_filename);
 }
 
-static void seq_disk_cache_create_version_file(char *filepath)
+static void seq_disk_cache_create_version_file(const char *filepath)
 {
   BLI_file_ensure_parent_dir_exists(filepath);
 
@@ -475,7 +475,7 @@ static bool seq_disk_cache_read_header(FILE *file, DiskCacheHeader *header)
   return true;
 }
 
-static size_t seq_disk_cache_write_header(FILE *file, DiskCacheHeader *header)
+static size_t seq_disk_cache_write_header(FILE *file, const DiskCacheHeader *header)
 {
   BLI_fseek(file, 0LL, SEEK_SET);
   return fwrite(header, sizeof(*header), 1, file);
@@ -531,7 +531,7 @@ static int seq_disk_cache_add_header_entry(SeqCacheKey *key, ImBuf *ibuf, DiskCa
   return i;
 }
 
-static int seq_disk_cache_get_header_entry(SeqCacheKey *key, DiskCacheHeader *header)
+static int seq_disk_cache_get_header_entry(SeqCacheKey *key, const DiskCacheHeader *header)
 {
   for (int i = 0; i < DCACHE_IMAGES_PER_FILE; i++) {
     if (header->entry[i].frameno == key->frame_index) {
diff --git a/source/blender/sequencer/intern/effects.cc b/source/blender/sequencer/intern/effects.cc
index 00146c174e1..06886bdefa7 100644
--- a/source/blender/sequencer/intern/effects.cc
+++ b/source/blender/sequencer/intern/effects.cc
@@ -888,7 +888,7 @@ static void apply_blend_function(
 }
 
 static void do_blend_effect_float(
-    float fac, int x, int y, float *rect1, float *rect2, int btype, float *out)
+    float fac, int x, int y, const float *rect1, float *rect2, int btype, float *out)
 {
   switch (btype) {
     case SEQ_TYPE_ADD:
diff --git a/source/blender/sequencer/intern/utils.cc b/source/blender/sequencer/intern/utils.cc
index 9ff6d8b2b45..3823b15ab28 100644
--- a/source/blender/sequencer/intern/utils.cc
+++ b/source/blender/sequencer/intern/utils.cc
@@ -257,7 +257,7 @@ static void index_dir_set(Editing *ed, Sequence *seq, StripAnim *sanim)
   seq_proxy_index_dir_set(sanim->anim, proxy_dirpath);
 }
 
-static bool open_anim_file_multiview(Scene *scene, Sequence *seq, char *filepath)
+static bool open_anim_file_multiview(Scene *scene, Sequence *seq, const char *filepath)
 {
   char prefix[FILE_MAX];
   const char *ext = nullptr;
diff --git a/source/blender/windowmanager/intern/wm_gesture.cc b/source/blender/windowmanager/intern/wm_gesture.cc
index 251bf1352d2..29bdcee9cb9 100644
--- a/source/blender/windowmanager/intern/wm_gesture.cc
+++ b/source/blender/windowmanager/intern/wm_gesture.cc
@@ -116,7 +116,7 @@ bool WM_gesture_is_modal_first(const wmGesture *gesture)
 
 /* ******************* gesture draw ******************* */
 
-static void wm_gesture_draw_line_active_side(rcti *rect, const bool flip)
+static void wm_gesture_draw_line_active_side(const rcti *rect, const bool flip)
 {
   GPUVertFormat *format = immVertexFormat();
   uint shdr_pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
@@ -167,7 +167,7 @@ static void wm_gesture_draw_line_active_side(rcti *rect, const bool flip)
 
 static void wm_gesture_draw_line(wmGesture *gt)
 {
-  rcti *rect = (rcti *)gt->customdata;
+  const rcti *rect = (rcti *)gt->customdata;
 
   if (gt->draw_active_side) {
     wm_gesture_draw_line_active_side(rect, gt->use_flip);