w_grid_alloc: baseline impl

src/nvim/api/vim.c

@@ -2831,8 +2831,8 @@ Array nvim__inspect_cell(Integer grid, Integer row, Integer col, Error *err)
     g = &pum_grid;
   } else if (grid > 1) {
     win_T *wp = get_win_by_grid_handle((handle_T)grid);
-    if (wp != NULL && wp->w_grid.chars != NULL) {
-      g = &wp->w_grid;
+    if (wp != NULL && wp->w_grid_alloc.chars != NULL) {
+      g = &wp->w_grid_alloc;
     } else {
       api_set_error(err, kErrorTypeValidation,
                     "No grid with the given handle");

src/nvim/autocmd.c

@@ -1192,10 +1192,10 @@ void aucmd_restbuf(aco_save_T *aco)
 
     win_remove(curwin, NULL);
     handle_unregister_window(curwin);
-    if (curwin->w_grid.chars != NULL) {
-      ui_comp_remove_grid(&curwin->w_grid);
-      ui_call_win_hide(curwin->w_grid.handle);
-      grid_free(&curwin->w_grid);
+    if (curwin->w_grid_alloc.chars != NULL) {
+      ui_comp_remove_grid(&curwin->w_grid_alloc);
+      ui_call_win_hide(curwin->w_grid_alloc.handle);
+      grid_free(&curwin->w_grid_alloc);
     }
 
     aucmd_win_used = false;

src/nvim/buffer_defs.h

@@ -1409,6 +1409,7 @@ struct window_S {
   int w_tagstacklen;                    // number of tags on stack
 
   ScreenGrid w_grid;                    // the grid specific to the window
+  ScreenGrid w_grid_alloc;              // the grid specific to the window
   bool w_pos_changed;                   // true if window position changed
   bool w_floating;                       ///< whether the window is floating
   FloatConfig w_float_config;

src/nvim/edit.c

@@ -1565,7 +1565,7 @@ void edit_putchar(int c, bool highlight)
 {
   int attr;
 
-  if (curwin->w_grid.chars != NULL || default_grid.chars != NULL) {
+  if (curwin->w_grid_alloc.chars != NULL || default_grid.chars != NULL) {
     update_topline(curwin);  // just in case w_topline isn't valid
     validate_cursor();
     if (highlight) {

src/nvim/grid_defs.h

@@ -35,7 +35,8 @@ typedef int sattr_T;
 /// line_wraps[] is an array of boolean flags indicating if the screen line
 /// wraps to the next line. It can only be true if a window occupies the entire
 /// screen width.
-typedef struct {
+typedef struct ScreenGrid ScreenGrid;
+struct ScreenGrid {
   handle_T handle;
 
   schar_T  *chars;
@@ -58,10 +59,13 @@ typedef struct {
   // external UI.
   bool throttled;
 
-  // offsets for the grid relative to the global screen. Used by screen.c
-  // for windows that don't have w_grid->chars etc allocated
+  // TODO(bfredl): maybe physical grids and "views" (i e drawing
+  // specifications) should be two separate types?
+  // offsets for the grid relative to another grid. Used for grids
+  // that are views into another, actually allocated grid 'target'
   int row_offset;
   int col_offset;
+  ScreenGrid *target;
 
   // whether the compositor should blend the grid with the background grid
   bool blending;
@@ -89,9 +93,10 @@ typedef struct {
   // compositor should momentarily ignore the grid. Used internally when
   // moving around grids etc.
   bool comp_disabled;
-} ScreenGrid;
+};
 
 #define SCREEN_GRID_INIT { 0, NULL, NULL, NULL, NULL, NULL, 0, 0, false, \
-                           false, 0, 0, false, true, 0, 0, 0, 0, 0,  false }
+                           false, 0, 0, NULL, false, true, \
+                           0, 0, 0, 0, 0,  false }
 
 #endif  // NVIM_GRID_DEFS_H

src/nvim/highlight.c

@@ -517,6 +517,10 @@ static HlAttrs get_colors_force(int attr)
 /// @return the resulting attributes.
 int hl_blend_attrs(int back_attr, int front_attr, bool *through)
 {
+  if (front_attr < 0 || back_attr < 0) {
+    return -1;
+  }
+
   HlAttrs fattrs = get_colors_force(front_attr);
   int ratio = fattrs.hl_blend;
   if (ratio <= 0) {

src/nvim/message.c

@@ -178,6 +178,7 @@ void msg_grid_validate(void)
     msg_grid.throttled = false;  // don't throttle in 'cmdheight' area
     msg_scrolled_at_flush = msg_scrolled;
     msg_grid.focusable = false;
+    msg_grid_adj.target = &msg_grid;
     if (!msg_scrolled) {
       msg_grid_set_pos(Rows - p_ch, false);
     }
@@ -188,6 +189,7 @@ void msg_grid_validate(void)
     ui_call_grid_destroy(msg_grid.handle);
     msg_grid.throttled = false;
     msg_grid_adj.row_offset = 0;
+    msg_grid_adj.target = &default_grid;
     redraw_cmdline = true;
   } else if (msg_grid.chars && !msg_scrolled && msg_grid_pos != Rows - p_ch) {
     msg_grid_set_pos(Rows - p_ch, false);

src/nvim/mouse.c

@@ -470,7 +470,7 @@ static win_T *mouse_find_grid_win(int *gridp, int *rowp, int *colp)
     *gridp = DEFAULT_GRID_HANDLE;
   } else if (*gridp > 1) {
     win_T *wp = get_win_by_grid_handle(*gridp);
-    if (wp && wp->w_grid.chars
+    if (wp && wp->w_grid_alloc.chars
         && !(wp->w_floating && !wp->w_float_config.focusable)) {
       *rowp = MIN(*rowp, wp->w_grid.Rows-1);
       *colp = MIN(*colp, wp->w_grid.Columns-1);
@@ -479,7 +479,7 @@ static win_T *mouse_find_grid_win(int *gridp, int *rowp, int *colp)
   } else if (*gridp == 0) {
     ScreenGrid *grid = ui_comp_mouse_focus(*rowp, *colp);
     FOR_ALL_WINDOWS_IN_TAB(wp, curtab) {
-      if (&wp->w_grid != grid) {
+      if (&wp->w_grid_alloc != grid) {
         continue;
       }
       *gridp = grid->handle;
@@ -729,7 +729,7 @@ int mouse_check_fold(void)
   if (wp && mouse_row >= 0 && mouse_row < Rows
       && mouse_col >= 0 && mouse_col <= Columns) {
     int multigrid = ui_has(kUIMultigrid);
-    ScreenGrid *gp = multigrid ? &wp->w_grid : &default_grid;
+    ScreenGrid *gp = multigrid ? &wp->w_grid_alloc : &default_grid;
     int fdc = win_fdccol_count(wp);
     int row = multigrid && mouse_grid == 0 ? click_row : mouse_row;
     int col = multigrid && mouse_grid == 0 ? click_col : mouse_col;

src/nvim/popupmnu.c

@@ -139,9 +139,8 @@ void pum_display(pumitem_T *array, int size, int selected, bool array_changed,
         cursor_col = curwin->w_wcol;
       }
 
-      pum_anchor_grid = (int)curwin->w_grid.handle;
+      pum_anchor_grid = (int)curwin->w_grid.target->handle;
       if (!ui_has(kUIMultigrid)) {
-        pum_anchor_grid = (int)default_grid.handle;
         pum_win_row += curwin->w_winrow;
         cursor_col += curwin->w_wincol;
       }

src/nvim/screen.c

@@ -232,7 +232,7 @@ void screen_invalidate_highlights(void)
 {
   FOR_ALL_WINDOWS_IN_TAB(wp, curtab) {
     redraw_later(wp, NOT_VALID);
-    wp->w_grid.valid = false;
+    wp->w_grid_alloc.valid = false;
   }
 }
 
@@ -582,8 +582,8 @@ int update_screen(int type)
 
 
   FOR_ALL_WINDOWS_IN_TAB(wp, curtab) {
-    if (wp->w_redr_type == CLEAR && wp->w_floating && wp->w_grid.chars) {
-      grid_invalidate(&wp->w_grid);
+    if (wp->w_redr_type == CLEAR && wp->w_floating && wp->w_grid_alloc.chars) {
+      grid_invalidate(&wp->w_grid_alloc);
       wp->w_redr_type = NOT_VALID;
     }
 
@@ -4404,14 +4404,10 @@ void draw_virt_text(buf_T *buf, int *end_col, int max_col)
 /// screen positions.
 void screen_adjust_grid(ScreenGrid **grid, int *row_off, int *col_off)
 {
-  if (!(*grid)->chars && *grid != &default_grid) {
-      *row_off += (*grid)->row_offset;
-      *col_off += (*grid)->col_offset;
-    if (*grid == &msg_grid_adj && msg_grid.chars) {
-      *grid = &msg_grid;
-    } else {
-      *grid = &default_grid;
-    }
+  if ((*grid)->target) {
+    *row_off += (*grid)->row_offset;
+    *col_off += (*grid)->col_offset;
+    *grid = (*grid)->target;
   }
 }
 
@@ -6143,12 +6139,13 @@ void check_for_delay(int check_msg_scroll)
 void win_grid_alloc(win_T *wp)
 {
   ScreenGrid *grid = &wp->w_grid;
+  ScreenGrid *grid_allocated = &wp->w_grid_alloc;
 
   int rows = wp->w_height_inner;
   int cols = wp->w_width_inner;
 
   bool want_allocation = ui_has(kUIMultigrid) || wp->w_floating;
-  bool has_allocation = (grid->chars != NULL);
+  bool has_allocation = (grid_allocated->chars != NULL);
 
   if (grid->Rows != rows) {
     wp->w_lines_valid = 0;
@@ -6156,36 +6153,45 @@ void win_grid_alloc(win_T *wp)
     wp->w_lines = xcalloc(rows+1, sizeof(wline_T));
   }
 
+  int total_rows = rows, total_cols = cols;
+
   int was_resized = false;
-  if ((has_allocation != want_allocation)
-      || grid->Rows != rows
-      || grid->Columns != cols) {
-    if (want_allocation) {
-      grid_alloc(grid, rows, cols, wp->w_grid.valid, false);
-      grid->valid = true;
-    } else {
-      // Single grid mode, all rendering will be redirected to default_grid.
-      // Only keep track of the size and offset of the window.
-      grid_free(grid);
-      grid->Rows = rows;
-      grid->Columns = cols;
-      grid->valid = false;
-    }
+  if (want_allocation && (!has_allocation
+      || grid_allocated->Rows != total_rows
+      || grid_allocated->Columns != total_cols)) {
+    grid_alloc(grid_allocated, total_rows, total_cols, wp->w_grid_alloc.valid, false);
+    grid_allocated->valid = true;
     was_resized = true;
-  } else if (want_allocation && has_allocation && !wp->w_grid.valid) {
-    grid_invalidate(grid);
-    grid->valid = true;
+  } else if (!want_allocation && has_allocation) {
+    // Single grid mode, all rendering will be redirected to default_grid.
+    // Only keep track of the size and offset of the window.
+    grid_free(grid_allocated);
+    grid_allocated->valid = false;
+    was_resized = true;
+  } else if (want_allocation && has_allocation && !wp->w_grid_alloc.valid) {
+    grid_invalidate(grid_allocated);
+    grid_allocated->valid = true;
   }
 
-  grid->row_offset = wp->w_winrow;
-  grid->col_offset = wp->w_wincol;
+  grid->Rows = rows;
+  grid->Columns = cols;
+
+  if (want_allocation) {
+    grid->target = grid_allocated;
+    grid->row_offset = 0;
+    grid->col_offset = 0;
+  } else {
+    grid->target = &default_grid;
+    grid->row_offset = wp->w_winrow;
+    grid->col_offset = wp->w_wincol;
+  }
 
   // send grid resize event if:
   // - a grid was just resized
   // - screen_resize was called and all grid sizes must be sent
   // - the UI wants multigrid event (necessary)
   if ((send_grid_resize || was_resized) && want_allocation) {
-    ui_call_grid_resize(grid->handle, grid->Columns, grid->Rows);
+    ui_call_grid_resize(grid_allocated->handle, grid_allocated->Columns, grid_allocated->Rows);
   }
 }
 
@@ -7531,7 +7537,7 @@ void win_new_shellsize(void)
 win_T *get_win_by_grid_handle(handle_T handle)
 {
   FOR_ALL_WINDOWS_IN_TAB(wp, curtab) {
-    if (wp->w_grid.handle == handle) {
+    if (wp->w_grid_alloc.handle == handle) {
       return wp;
     }
   }

src/nvim/window.c

@@ -713,7 +713,7 @@ int win_fdccol_count(win_T *wp)
 void ui_ext_win_position(win_T *wp)
 {
   if (!wp->w_floating) {
-    ui_call_win_pos(wp->w_grid.handle, wp->handle, wp->w_winrow,
+    ui_call_win_pos(wp->w_grid_alloc.handle, wp->handle, wp->w_winrow,
                     wp->w_wincol, wp->w_width, wp->w_height);
     return;
   }
@@ -743,7 +743,7 @@ void ui_ext_win_position(win_T *wp)
     }
     if (ui_has(kUIMultigrid)) {
       String anchor = cstr_to_string(float_anchor_str[c.anchor]);
-      ui_call_win_float_pos(wp->w_grid.handle, wp->handle, anchor, grid->handle,
+      ui_call_win_float_pos(wp->w_grid_alloc.handle, wp->handle, anchor, grid->handle,
                             row, col, c.focusable);
     } else {
       // TODO(bfredl): ideally, compositor should work like any multigrid UI
@@ -759,17 +759,17 @@ void ui_ext_win_position(win_T *wp)
       wp->w_wincol = comp_col;
       bool valid = (wp->w_redr_type == 0);
       bool on_top = (curwin == wp) || !curwin->w_floating;
-      ui_comp_put_grid(&wp->w_grid, comp_row, comp_col, wp->w_height,
+      ui_comp_put_grid(&wp->w_grid_alloc, comp_row, comp_col, wp->w_height,
                        wp->w_width, valid, on_top);
-      ui_check_cursor_grid(wp->w_grid.handle);
-      wp->w_grid.focusable = wp->w_float_config.focusable;
+      ui_check_cursor_grid(wp->w_grid_alloc.handle);
+      wp->w_grid_alloc.focusable = wp->w_float_config.focusable;
       if (!valid) {
-        wp->w_grid.valid = false;
+        wp->w_grid_alloc.valid = false;
         redraw_later(wp, NOT_VALID);
       }
     }
   } else {
-    ui_call_win_external_pos(wp->w_grid.handle, wp->handle);
+    ui_call_win_external_pos(wp->w_grid_alloc.handle, wp->handle);
   }
 
 }
@@ -784,7 +784,7 @@ void ui_ext_win_viewport(win_T *wp)
       // interact with incomplete final line? Diff filler lines?
       botline = wp->w_buffer->b_ml.ml_line_count;
     }
-    ui_call_win_viewport(wp->w_grid.handle, wp->handle, wp->w_topline-1,
+    ui_call_win_viewport(wp->w_grid_alloc.handle, wp->handle, wp->w_topline-1,
                          botline, wp->w_cursor.lnum-1, wp->w_cursor.col);
     wp->w_viewport_invalid = false;
   }
@@ -1953,12 +1953,12 @@ static void win_totop(int size, int flags)
   }
 
   if (curwin->w_floating) {
-    ui_comp_remove_grid(&curwin->w_grid);
+    ui_comp_remove_grid(&curwin->w_grid_alloc);
     if (ui_has(kUIMultigrid)) {
       curwin->w_pos_changed = true;
     } else {
       // No longer a float, a non-multigrid UI shouldn't draw it as such
-      ui_call_win_hide(curwin->w_grid.handle);
+      ui_call_win_hide(curwin->w_grid_alloc.handle);
       win_free_grid(curwin, false);
     }
   } else {
@@ -2581,11 +2581,11 @@ int win_close(win_T *win, bool free_buf)
 
   bool was_floating = win->w_floating;
   if (ui_has(kUIMultigrid)) {
-    ui_call_win_close(win->w_grid.handle);
+    ui_call_win_close(win->w_grid_alloc.handle);
   }
 
   if (win->w_floating) {
-    ui_comp_remove_grid(&win->w_grid);
+    ui_comp_remove_grid(&win->w_grid_alloc);
     if (win->w_float_config.external) {
       for (tabpage_T *tp = first_tabpage; tp != NULL; tp = tp->tp_next) {
         if (tp == curtab) {
@@ -4131,7 +4131,7 @@ static void tabpage_check_windows(tabpage_T *old_curtab)
         win_remove(wp, old_curtab);
         win_append(lastwin_nofloating(), wp);
       } else {
-        ui_comp_remove_grid(&wp->w_grid);
+        ui_comp_remove_grid(&wp->w_grid_alloc);
       }
     }
     wp->w_pos_changed = true;
@@ -4726,7 +4726,7 @@ static win_T *win_alloc(win_T *after, int hidden)
   new_wp->handle = ++last_win_id;
   handle_register_window(new_wp);
 
-  grid_assign_handle(&new_wp->w_grid);
+  grid_assign_handle(&new_wp->w_grid_alloc);
 
   // Init w: variables.
   new_wp->w_vars = tv_dict_alloc();
@@ -4850,15 +4850,14 @@ win_free (
 
 void win_free_grid(win_T *wp, bool reinit)
 {
-  if (wp->w_grid.handle != 0 && ui_has(kUIMultigrid)) {
-    ui_call_grid_destroy(wp->w_grid.handle);
-    wp->w_grid.handle = 0;
+  if (wp->w_grid_alloc.handle != 0 && ui_has(kUIMultigrid)) {
+    ui_call_grid_destroy(wp->w_grid_alloc.handle);
   }
-  grid_free(&wp->w_grid);
+  grid_free(&wp->w_grid_alloc);
   if (reinit) {
     // if a float is turned into a split and back into a float, the grid
     // data structure will be reused
-    memset(&wp->w_grid, 0, sizeof(wp->w_grid));
+    memset(&wp->w_grid_alloc, 0, sizeof(wp->w_grid_alloc));
   }
 }
 
@@ -7099,11 +7098,11 @@ void get_framelayout(const frame_T *fr, list_T *l, bool outer)
 void win_ui_flush(void)
 {
   FOR_ALL_TAB_WINDOWS(tp, wp) {
-    if (wp->w_pos_changed && wp->w_grid.chars != NULL) {
+    if (wp->w_pos_changed && wp->w_grid_alloc.chars != NULL) {
       if (tp == curtab) {
         ui_ext_win_position(wp);
       } else {
-        ui_call_win_hide(wp->w_grid.handle);
+        ui_call_win_hide(wp->w_grid_alloc.handle);
       }
       wp->w_pos_changed = false;
     }