multigrid: Get rid of global ScreenLines and set_screengrid

src/nvim/api/vim.c

@@ -1920,13 +1920,13 @@ Object nvim_get_proc(Integer pid, Error *err)
 Array nvim__inspect_cell(Integer row, Integer col, Error *err)
 {
   Array ret = ARRAY_DICT_INIT;
-  if (row < 0 || row >= screen_Rows
-      || col < 0 || col >= screen_Columns) {
+  if (row < 0 || row >= default_grid.Rows
+      || col < 0 || col >= default_grid.Columns) {
     return ret;
   }
-  size_t off = LineOffset[(size_t)row] + (size_t)col;
-  ADD(ret, STRING_OBJ(cstr_to_string((char *)ScreenLines[off])));
-  int attr = ScreenAttrs[off];
+  size_t off = default_grid.LineOffset[(size_t)row] + (size_t)col;
+  ADD(ret, STRING_OBJ(cstr_to_string((char *)default_grid.ScreenLines[off])));
+  int attr = default_grid.ScreenAttrs[off];
   ADD(ret, DICTIONARY_OBJ(hl_get_attr_by_id(attr, true, err)));
   // will not work first time
   if (!highlight_use_hlstate()) {

src/nvim/edit.c

@@ -1494,7 +1494,7 @@ void edit_putchar(int c, int highlight)
 {
   int attr;
 
-  if (ScreenLines != NULL) {
+  if (default_grid.ScreenLines != NULL) {
     update_topline();           /* just in case w_topline isn't valid */
     validate_cursor();
     if (highlight) {

src/nvim/eval.c

@@ -14023,11 +14023,11 @@ static void f_screenattr(typval_T *argvars, typval_T *rettv, FunPtr fptr)
 
   const int row = (int)tv_get_number_chk(&argvars[0], NULL) - 1;
   const int col = (int)tv_get_number_chk(&argvars[1], NULL) - 1;
-  if (row < 0 || row >= screen_Rows
-      || col < 0 || col >= screen_Columns) {
+  if (row < 0 || row >= default_grid.Rows
+      || col < 0 || col >= default_grid.Columns) {
     c = -1;
   } else {
-    c = ScreenAttrs[LineOffset[row] + col];
+    c = default_grid.ScreenAttrs[default_grid.LineOffset[row] + col];
   }
   rettv->vval.v_number = c;
 }
@@ -14042,12 +14042,12 @@ static void f_screenchar(typval_T *argvars, typval_T *rettv, FunPtr fptr)
 
   const int row = tv_get_number_chk(&argvars[0], NULL) - 1;
   const int col = tv_get_number_chk(&argvars[1], NULL) - 1;
-  if (row < 0 || row >= screen_Rows
-      || col < 0 || col >= screen_Columns) {
+  if (row < 0 || row >= default_grid.Rows
+      || col < 0 || col >= default_grid.Columns) {
     c = -1;
   } else {
-    off = LineOffset[row] + col;
-    c = utf_ptr2char(ScreenLines[off]);
+    off = default_grid.LineOffset[row] + col;
+    c = utf_ptr2char(default_grid.ScreenLines[off]);
   }
   rettv->vval.v_number = c;
 }

src/nvim/globals.h

@@ -91,9 +91,10 @@ EXTERN struct nvim_stats_s {
 /*
  * Number of Rows and Columns in the screen.
  * Must be long to be able to use them as options in option.c.
- * Note: Use screen_Rows and screen_Columns to access items in ScreenLines[].
- * They may have different values when the screen wasn't (re)allocated yet
- * after setting Rows or Columns (e.g., when starting up).
+ * Note: Use default_grid.Rows and default_grid.Columns to access items in
+ * default_grid.ScreenLines[]. They may have different values when the screen
+ * wasn't (re)allocated yet after setting Rows or Columns (e.g., when starting
+ * up).
  */
 #define DFLT_COLS       80              // default value for 'columns'
 #define DFLT_ROWS       24              // default value for 'lines'
@@ -150,17 +151,11 @@ typedef off_t off_T;
 /// to the next line. It can only be true if a window occupies the entire screen
 /// width.
 ///
+/// These, with other related attributes, are stored in a "ScreenGrid"
+/// datastructure.
 ///
 /// Note: before the screen is initialized and when out of memory these can be
 /// NULL.
-EXTERN schar_T  *ScreenLines INIT(= NULL);
-EXTERN sattr_T  *ScreenAttrs INIT(= NULL);
-EXTERN unsigned *LineOffset INIT(= NULL);
-EXTERN char_u   *LineWraps INIT(= NULL);        /* line wraps to next line */
-
-EXTERN int screen_Rows INIT(= 0);           /* actual size of ScreenLines[] */
-EXTERN int screen_Columns INIT(= 0);        /* actual size of ScreenLines[] */
-
 EXTERN ScreenGrid default_grid INIT(= { 0, NULL, NULL, NULL, NULL, 0, 0, 0, 0,
                                         0, 0 });
 

src/nvim/highlight.c

@@ -213,11 +213,11 @@ void clear_hl_tables(bool reinit)
     highlight_attr_set_all();
     highlight_changed();
     redraw_all_later(NOT_VALID);
-    if (ScreenAttrs) {
+    if (default_grid.ScreenAttrs) {
       // the meaning of 0 doesn't change anyway
       // but the rest must be retransmitted
-      memset(ScreenAttrs, 0,
-             sizeof(*ScreenAttrs) * (size_t)(screen_Rows * screen_Columns));
+      memset(default_grid.ScreenAttrs, 0, sizeof(*default_grid.ScreenAttrs)
+             * (size_t)(default_grid.Rows * default_grid.Columns));
     }
   } else {
     kv_destroy(attr_entries);

src/nvim/mbyte.c

@@ -560,7 +560,8 @@ size_t mb_string2cells(const char_u *str)
 /// We make sure that the offset used is less than "max_off".
 int utf_off2cells(unsigned off, unsigned max_off)
 {
-  return (off + 1 < max_off && ScreenLines[off + 1][0] == 0) ? 2 : 1;
+  return (off + 1 < max_off
+          && default_grid.ScreenLines[off + 1][0] == 0) ? 2 : 1;
 }
 
 /// Convert a UTF-8 byte sequence to a wide character
@@ -1829,8 +1830,8 @@ const char *mb_unescape(const char **const pp)
  */
 bool mb_lefthalve(int row, int col)
 {
-  return utf_off2cells(LineOffset[row] + col,
-                       LineOffset[row] + screen_Columns) > 1;
+  return utf_off2cells(default_grid.LineOffset[row] + col,
+                       default_grid.LineOffset[row] + screen_Columns) > 1;
 }
 
 /*
@@ -1841,8 +1842,8 @@ int mb_fix_col(int col, int row)
 {
   col = check_col(col);
   row = check_row(row);
-  if (ScreenLines != NULL && col > 0
-      && ScreenLines[LineOffset[row] + col][0] == 0) {
+  if (default_grid.ScreenLines != NULL && col > 0
+      && default_grid.ScreenLines[default_grid.LineOffset[row] + col][0] == 0) {
     return col - 1;
   }
   return col;

src/nvim/mouse.c

@@ -110,8 +110,9 @@ retnomove:
   // Remember the character under the mouse, it might be a '-' or '+' in the
   // fold column. NB: only works for ASCII chars!
   if (row >= 0 && row < Rows && col >= 0 && col <= Columns
-      && ScreenLines != NULL) {
-    mouse_char = ScreenLines[LineOffset[row] + (unsigned)col][0];
+      && default_grid.ScreenLines != NULL) {
+    mouse_char = default_grid.ScreenLines[default_grid.LineOffset[row]
+                 + (unsigned)col][0];
   } else {
     mouse_char = ' ';
   }

src/nvim/screen.c

@@ -2021,8 +2021,8 @@ static void copy_text_attr(int off, char_u *buf, int len, int attr)
   int i;
 
   for (i = 0; i < len; i++) {
-    schar_from_ascii(ScreenLines[off + i], buf[i]);
-    ScreenAttrs[off + i] = attr;
+    schar_from_ascii(default_grid.ScreenLines[off + i], buf[i]);
+    default_grid.ScreenAttrs[off + i] = attr;
   }
 }
 
@@ -5967,13 +5967,14 @@ void grid_assign_handle(ScreenGrid *grid)
 
 /*
  * Resize the shell to Rows and Columns.
- * Allocate ScreenLines[] and associated items.
+ * Allocate default_grid.ScreenLines[] and associated items.
  *
  * There may be some time between setting Rows and Columns and (re)allocating
- * ScreenLines[].  This happens when starting up and when (manually) changing
- * the shell size.  Always use screen_Rows and screen_Columns to access items
- * in ScreenLines[].  Use Rows and Columns for positioning text etc. where the
- * final size of the shell is needed.
+ * default_grid.ScreenLines[].  This happens when starting up and when
+ * (manually) changing the shell size.  Always use default_grid.Rows and
+ * default_grid.Columns to access items in default_grid.ScreenLines[].  Use Rows
+ * and Columns for positioning text etc. where the final size of the shell is
+ * needed.
  */
 void screenalloc(bool doclear)
 {
@@ -6044,16 +6045,9 @@ retry:
   clear_tab_page_click_defs(tab_page_click_defs, tab_page_click_defs_size);
   xfree(tab_page_click_defs);
 
-  set_screengrid(&default_grid);
-
   tab_page_click_defs = new_tab_page_click_defs;
   tab_page_click_defs_size = default_grid.Columns;
 
-  /* It's important that screen_Rows and screen_Columns reflect the actual
-   * size of ScreenLines[].  Set them before calling anything. */
-  screen_Rows = default_grid.Rows;
-  screen_Columns = default_grid.Columns;
-
   default_grid.OffsetRow = 0;
   default_grid.OffsetColumn = 0;
   default_grid.handle = DEFAULT_GRID_HANDLE;
@@ -6129,14 +6123,6 @@ void free_screengrid(ScreenGrid *grid)
   xfree(grid->LineWraps);
 }
 
-void set_screengrid(ScreenGrid *grid)
-{
-  ScreenLines = grid->ScreenLines;
-  ScreenAttrs = grid->ScreenAttrs;
-  LineOffset = grid->LineOffset;
-  LineWraps = grid->LineWraps;
-}
-
 /// Clear tab_page_click_defs table
 ///
 /// @param[out]  tpcd  Table to clear.
@@ -6165,14 +6151,15 @@ static void screenclear2(void)
 {
   int i;
 
-  if (starting == NO_SCREEN || ScreenLines == NULL) {
+  if (starting == NO_SCREEN || default_grid.ScreenLines == NULL) {
     return;
   }
 
   /* blank out ScreenLines */
   for (i = 0; i < default_grid.Rows; ++i) {
-    grid_clear_line(&default_grid, LineOffset[i], (int)default_grid.Columns, true);
-    LineWraps[i] = FALSE;
+    grid_clear_line(&default_grid, default_grid.LineOffset[i],
+                    (int)default_grid.Columns, true);
+    default_grid.LineWraps[i] = FALSE;
   }
 
   ui_call_grid_clear(1);  // clear the display