Fix a bug with error message null src bitmap in grub_video_bitmap_create_scaled

GRUB2/MOD_SRC/grub-2.04/grub-core/gfxmenu/view.c

+/* view.c - Graphical menu interface MVC view. */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2008  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/types.h>
+#include <grub/file.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/err.h>
+#include <grub/dl.h>
+#include <grub/normal.h>
+#include <grub/video.h>
+#include <grub/gfxterm.h>
+#include <grub/bitmap.h>
+#include <grub/bitmap_scale.h>
+#include <grub/term.h>
+#include <grub/gfxwidgets.h>
+#include <grub/time.h>
+#include <grub/menu.h>
+#include <grub/menu_viewer.h>
+#include <grub/gfxmenu_view.h>
+#include <grub/gui_string_util.h>
+#include <grub/icon_manager.h>
+#include <grub/i18n.h>
+
+static void
+init_terminal (grub_gfxmenu_view_t view);
+static void
+init_background (grub_gfxmenu_view_t view);
+static grub_gfxmenu_view_t term_view;
+
+/* Create a new view object, loading the theme specified by THEME_PATH and
+   associating MODEL with the view.  */
+grub_gfxmenu_view_t
+grub_gfxmenu_view_new (const char *theme_path,
+		       int width, int height)
+{
+  grub_gfxmenu_view_t view;
+  grub_font_t default_font;
+  grub_video_rgba_color_t default_fg_color;
+  grub_video_rgba_color_t default_bg_color;
+
+  view = grub_malloc (sizeof (*view));
+  if (! view)
+    return 0;
+
+  while (grub_gfxmenu_timeout_notifications)
+    {
+      struct grub_gfxmenu_timeout_notify *p;
+      p = grub_gfxmenu_timeout_notifications;
+      grub_gfxmenu_timeout_notifications = grub_gfxmenu_timeout_notifications->next;
+      grub_free (p);
+    }
+
+  view->screen.x = 0;
+  view->screen.y = 0;
+  view->screen.width = width;
+  view->screen.height = height;
+
+  view->need_to_check_sanity = 1;
+  view->terminal_border = 3;
+  view->terminal_rect.width = view->screen.width * 7 / 10;
+  view->terminal_rect.height = view->screen.height * 7 / 10;
+  view->terminal_rect.x = view->screen.x + (view->screen.width
+                                            - view->terminal_rect.width) / 2;
+  view->terminal_rect.y = view->screen.y + (view->screen.height
+                                            - view->terminal_rect.height) / 2;
+
+  default_font = grub_font_get ("Unknown Regular 16");
+  default_fg_color = grub_video_rgba_color_rgb (0, 0, 0);
+  default_bg_color = grub_video_rgba_color_rgb (255, 255, 255);
+
+  view->canvas = 0;
+
+  view->title_font = default_font;
+  view->message_font = default_font;
+  view->terminal_font_name = grub_strdup ("Fixed 10");
+  view->title_color = default_fg_color;
+  view->message_color = default_bg_color;
+  view->message_bg_color = default_fg_color;
+  view->raw_desktop_image = 0;
+  view->scaled_desktop_image = 0;
+  view->desktop_image_scale_method = GRUB_VIDEO_BITMAP_SELECTION_METHOD_STRETCH;
+  view->desktop_image_h_align = GRUB_VIDEO_BITMAP_H_ALIGN_CENTER;
+  view->desktop_image_v_align = GRUB_VIDEO_BITMAP_V_ALIGN_CENTER;
+  view->desktop_color = default_bg_color;
+  view->terminal_box = grub_gfxmenu_create_box (0, 0);
+  view->title_text = grub_strdup (_("GRUB Boot Menu"));
+  view->progress_message_text = 0;
+  view->theme_path = 0;
+
+  /* Set the timeout bar's frame.  */
+  view->progress_message_frame.width = view->screen.width * 4 / 5;
+  view->progress_message_frame.height = 50;
+  view->progress_message_frame.x = view->screen.x
+    + (view->screen.width - view->progress_message_frame.width) / 2;
+  view->progress_message_frame.y = view->screen.y
+    + view->screen.height - 90 - 20 - view->progress_message_frame.height;
+
+  if (grub_gfxmenu_view_load_theme (view, theme_path) != 0)
+    {
+      grub_gfxmenu_view_destroy (view);
+      return 0;
+    }
+
+  return view;
+}
+
+/* Destroy the view object.  All used memory is freed.  */
+void
+grub_gfxmenu_view_destroy (grub_gfxmenu_view_t view)
+{
+  if (!view)
+    return;
+  while (grub_gfxmenu_timeout_notifications)
+    {
+      struct grub_gfxmenu_timeout_notify *p;
+      p = grub_gfxmenu_timeout_notifications;
+      grub_gfxmenu_timeout_notifications = grub_gfxmenu_timeout_notifications->next;
+      grub_free (p);
+    }
+  grub_video_bitmap_destroy (view->raw_desktop_image);
+  grub_video_bitmap_destroy (view->scaled_desktop_image);
+  if (view->terminal_box)
+    view->terminal_box->destroy (view->terminal_box);
+  grub_free (view->terminal_font_name);
+  grub_free (view->title_text);
+  grub_free (view->progress_message_text);
+  grub_free (view->theme_path);
+  if (view->canvas)
+    view->canvas->component.ops->destroy (view->canvas);
+  grub_free (view);
+}
+
+static void
+redraw_background (grub_gfxmenu_view_t view,
+		   const grub_video_rect_t *bounds)
+{
+  if (view->scaled_desktop_image)
+    {
+      struct grub_video_bitmap *img = view->scaled_desktop_image;
+      grub_video_blit_bitmap (img, GRUB_VIDEO_BLIT_REPLACE,
+                              bounds->x, bounds->y,
+			      bounds->x - view->screen.x,
+			      bounds->y - view->screen.y,
+			      bounds->width, bounds->height);
+    }
+  else
+    {
+      grub_video_fill_rect (grub_video_map_rgba_color (view->desktop_color),
+                            bounds->x, bounds->y,
+                            bounds->width, bounds->height);
+    }
+}
+
+static void
+draw_title (grub_gfxmenu_view_t view)
+{
+  if (! view->title_text)
+    return;
+
+  /* Center the title. */
+  int title_width = grub_font_get_string_width (view->title_font,
+                                                view->title_text);
+  int x = (view->screen.width - title_width) / 2;
+  int y = 40 + grub_font_get_ascent (view->title_font);
+  grub_font_draw_string (view->title_text,
+                         view->title_font,
+                         grub_video_map_rgba_color (view->title_color),
+                         x, y);
+}
+
+struct progress_value_data
+{
+  int visible;
+  int start;
+  int end;
+  int value;
+};
+
+struct grub_gfxmenu_timeout_notify *grub_gfxmenu_timeout_notifications;
+
+static void
+update_timeouts (int visible, int start, int value, int end)
+{
+  struct grub_gfxmenu_timeout_notify *cur;
+
+  for (cur = grub_gfxmenu_timeout_notifications; cur; cur = cur->next)
+    cur->set_state (cur->self, visible, start, value, end);
+}
+
+static void
+redraw_timeouts (struct grub_gfxmenu_view *view)
+{
+  struct grub_gfxmenu_timeout_notify *cur;
+
+  for (cur = grub_gfxmenu_timeout_notifications; cur; cur = cur->next)
+    {
+      grub_video_rect_t bounds;
+      cur->self->ops->get_bounds (cur->self, &bounds);
+      grub_video_set_area_status (GRUB_VIDEO_AREA_ENABLED);
+      grub_gfxmenu_view_redraw (view, &bounds);
+    }
+}
+
+void 
+grub_gfxmenu_print_timeout (int timeout, void *data)
+{
+  struct grub_gfxmenu_view *view = data;
+
+  if (view->first_timeout == -1)
+    view->first_timeout = timeout;
+
+  update_timeouts (1, -view->first_timeout, -timeout, 0);
+  redraw_timeouts (view);
+  grub_video_swap_buffers ();
+  if (view->double_repaint)
+    redraw_timeouts (view);
+}
+
+void 
+grub_gfxmenu_clear_timeout (void *data)
+{
+  struct grub_gfxmenu_view *view = data;
+
+  update_timeouts (0, 1, 0, 0);
+  redraw_timeouts (view);
+  grub_video_swap_buffers ();
+  if (view->double_repaint)
+    redraw_timeouts (view);
+}
+
+static void
+update_menu_visit (grub_gui_component_t component,
+                   void *userdata)
+{
+  grub_gfxmenu_view_t view;
+  view = userdata;
+  if (component->ops->is_instance (component, "list"))
+    {
+      grub_gui_list_t list = (grub_gui_list_t) component;
+      list->ops->set_view_info (list, view);
+    }
+}
+
+/* Update any boot menu components with the current menu model and
+   theme path.  */
+static void
+update_menu_components (grub_gfxmenu_view_t view)
+{
+  grub_gui_iterate_recursively ((grub_gui_component_t) view->canvas,
+                                update_menu_visit, view);
+}
+
+static void
+refresh_menu_visit (grub_gui_component_t component,
+              void *userdata)
+{
+  grub_gfxmenu_view_t view;
+  view = userdata;
+  if (component->ops->is_instance (component, "list"))
+    {
+      grub_gui_list_t list = (grub_gui_list_t) component;
+      list->ops->refresh_list (list, view);
+    }
+}
+
+/* Refresh list information (useful for submenus) */
+static void
+refresh_menu_components (grub_gfxmenu_view_t view)
+{
+  grub_gui_iterate_recursively ((grub_gui_component_t) view->canvas,
+                                refresh_menu_visit, view);
+}
+
+static void
+draw_message (grub_gfxmenu_view_t view)
+{
+  char *text = view->progress_message_text;
+  grub_video_rect_t f = view->progress_message_frame;
+  if (! text)
+    return;
+
+  grub_font_t font = view->message_font;
+  grub_video_color_t color = grub_video_map_rgba_color (view->message_color);
+
+  /* Border.  */
+  grub_video_fill_rect (color,
+                        f.x-1, f.y-1, f.width+2, f.height+2);
+  /* Fill.  */
+  grub_video_fill_rect (grub_video_map_rgba_color (view->message_bg_color),
+                        f.x, f.y, f.width, f.height);
+
+  /* Center the text. */
+  int text_width = grub_font_get_string_width (font, text);
+  int x = f.x + (f.width - text_width) / 2;
+  int y = (f.y + (f.height - grub_font_get_descent (font)) / 2
+           + grub_font_get_ascent (font) / 2);
+  grub_font_draw_string (text, font, color, x, y);
+}
+
+void
+grub_gfxmenu_view_redraw (grub_gfxmenu_view_t view,
+			  const grub_video_rect_t *region)
+{
+  if (grub_video_have_common_points (&view->terminal_rect, region))
+    grub_gfxterm_schedule_repaint ();
+
+  grub_video_set_active_render_target (GRUB_VIDEO_RENDER_TARGET_DISPLAY);
+  grub_video_area_status_t area_status;
+  grub_video_get_area_status (&area_status);
+  if (area_status == GRUB_VIDEO_AREA_ENABLED)
+    grub_video_set_region (region->x, region->y,
+                           region->width, region->height);
+
+  redraw_background (view, region);
+  if (view->canvas)
+    view->canvas->component.ops->paint (view->canvas, region);
+  draw_title (view);
+  if (grub_video_have_common_points (&view->progress_message_frame, region))
+    draw_message (view);
+
+  if (area_status == GRUB_VIDEO_AREA_ENABLED)
+    grub_video_set_area_status (GRUB_VIDEO_AREA_ENABLED);
+}
+
+void
+grub_gfxmenu_view_draw (grub_gfxmenu_view_t view)
+{
+  init_terminal (view);
+
+  init_background (view);
+
+  /* Clear the screen; there may be garbage left over in video memory. */
+  grub_video_fill_rect (grub_video_map_rgb (0, 0, 0),
+                        view->screen.x, view->screen.y,
+                        view->screen.width, view->screen.height);
+  grub_video_swap_buffers ();
+  if (view->double_repaint)
+    grub_video_fill_rect (grub_video_map_rgb (0, 0, 0),
+			  view->screen.x, view->screen.y,
+			  view->screen.width, view->screen.height);
+
+  refresh_menu_components (view);
+  update_menu_components (view);
+
+  grub_video_set_area_status (GRUB_VIDEO_AREA_DISABLED);
+  grub_gfxmenu_view_redraw (view, &view->screen);
+  grub_video_swap_buffers ();
+  if (view->double_repaint)
+    {
+      grub_video_set_area_status (GRUB_VIDEO_AREA_DISABLED);
+      grub_gfxmenu_view_redraw (view, &view->screen);
+    }
+
+}
+
+static void
+redraw_menu_visit (grub_gui_component_t component,
+                   void *userdata)
+{
+  grub_gfxmenu_view_t view;
+  view = userdata;
+  if (component->ops->is_instance (component, "list"))
+    {
+      grub_video_rect_t bounds;
+
+      component->ops->get_bounds (component, &bounds);
+      grub_video_set_area_status (GRUB_VIDEO_AREA_ENABLED);
+      grub_gfxmenu_view_redraw (view, &bounds);
+    }
+}
+
+void
+grub_gfxmenu_redraw_menu (grub_gfxmenu_view_t view)
+{
+  update_menu_components (view);
+
+  grub_gui_iterate_recursively ((grub_gui_component_t) view->canvas,
+                                redraw_menu_visit, view);
+  grub_video_swap_buffers ();
+  if (view->double_repaint)
+    {
+      grub_gui_iterate_recursively ((grub_gui_component_t) view->canvas,
+				    redraw_menu_visit, view);
+    }
+}
+
+void 
+grub_gfxmenu_set_chosen_entry (int entry, void *data)
+{
+  grub_gfxmenu_view_t view = data;
+
+  view->selected = entry;
+  grub_gfxmenu_redraw_menu (view);
+}
+
+static void
+grub_gfxmenu_draw_terminal_box (void)
+{
+  grub_gfxmenu_box_t term_box;
+
+  term_box = term_view->terminal_box;
+  if (!term_box)
+    return;
+
+  grub_video_set_area_status (GRUB_VIDEO_AREA_DISABLED);
+
+  term_box->set_content_size (term_box, term_view->terminal_rect.width,
+			      term_view->terminal_rect.height);
+  
+  term_box->draw (term_box,
+		  term_view->terminal_rect.x - term_box->get_left_pad (term_box),
+		  term_view->terminal_rect.y - term_box->get_top_pad (term_box));
+}
+
+static void
+get_min_terminal (grub_font_t terminal_font,
+                  unsigned int border_width,
+                  unsigned int *min_terminal_width,
+                  unsigned int *min_terminal_height)
+{
+  struct grub_font_glyph *glyph;
+  glyph = grub_font_get_glyph (terminal_font, 'M');
+  *min_terminal_width = (glyph? glyph->device_width : 8) * 80
+                        + 2 * border_width;
+  *min_terminal_height = grub_font_get_max_char_height (terminal_font) * 24
+                         + 2 * border_width;
+}
+
+static void
+terminal_sanity_check (grub_gfxmenu_view_t view)
+{
+  if (!view->need_to_check_sanity)
+    return;
+
+  /* terminal_font was checked before in the init_terminal function. */
+  grub_font_t terminal_font = grub_font_get (view->terminal_font_name);
+
+  /* Non-negative numbers below. */
+  int scr_x = view->screen.x;
+  int scr_y = view->screen.y;
+  int scr_width = view->screen.width;
+  int scr_height = view->screen.height;
+  int term_x = view->terminal_rect.x;
+  int term_y = view->terminal_rect.y;
+  int term_width = view->terminal_rect.width;
+  int term_height = view->terminal_rect.height;
+
+  /* Check that border_width isn't too big. */
+  unsigned int border_width = view->terminal_border;
+  unsigned int min_terminal_width;
+  unsigned int min_terminal_height;
+  get_min_terminal (terminal_font, border_width,
+                    &min_terminal_width, &min_terminal_height);
+  if (border_width > 3 && ((int) min_terminal_width >= scr_width
+                           || (int) min_terminal_height >= scr_height))
+    {
+      border_width = 3;
+      get_min_terminal (terminal_font, border_width,
+                        &min_terminal_width, &min_terminal_height);
+    }
+
+  /* Sanity checks. */
+  if (term_width > scr_width)
+    term_width = scr_width;
+  if (term_height > scr_height)
+    term_height = scr_height;
+
+  if (scr_width <= (int) min_terminal_width
+      || scr_height <= (int) min_terminal_height)
+    {
+      /* The screen resulution is too low. Use all space, except a small border
+         to show the user, that it is a window. Then center the window. */
+      term_width = scr_width - 6 * border_width;
+      term_height = scr_height - 6 * border_width;
+      term_x = scr_x + (scr_width - term_width) / 2;
+      term_y = scr_y + (scr_height - term_height) / 2;
+    }
+  else if (term_width < (int) min_terminal_width
+           || term_height < (int) min_terminal_height)
+    {
+      /* The screen resolution is big enough. Make sure, that terminal screen
+         dimensions aren't less than minimal values. Then center the window. */
+      term_width = (int) min_terminal_width;
+      term_height = (int) min_terminal_height;
+      term_x = scr_x + (scr_width - term_width) / 2;
+      term_y = scr_y + (scr_height - term_height) / 2;
+    }
+
+  /* At this point w and h are satisfying. */
+  if (term_x + term_width > scr_width)
+    term_x = scr_width - term_width;
+  if (term_y + term_height > scr_height)
+    term_y = scr_height - term_height;
+
+  /* Write down corrected data. */
+  view->terminal_rect.x = (unsigned int) term_x;
+  view->terminal_rect.y = (unsigned int) term_y;
+  view->terminal_rect.width = (unsigned int) term_width;
+  view->terminal_rect.height = (unsigned int) term_height;
+  view->terminal_border = border_width;
+
+  view->need_to_check_sanity = 0;
+}
+
+static void
+init_terminal (grub_gfxmenu_view_t view)
+{
+  grub_font_t terminal_font;
+
+  terminal_font = grub_font_get (view->terminal_font_name);
+  if (!terminal_font)
+    {
+      grub_error (GRUB_ERR_BAD_FONT, "no font loaded");
+      return;
+    }
+
+  /* Check that terminal window size and position are sane. */
+  terminal_sanity_check (view);
+
+  term_view = view;
+
+  /* Note: currently there is no API for changing the gfxterm font
+     on the fly, so whatever font the initially loaded theme specifies
+     will be permanent.  */
+  grub_gfxterm_set_window (GRUB_VIDEO_RENDER_TARGET_DISPLAY,
+                           view->terminal_rect.x,
+                           view->terminal_rect.y,
+                           view->terminal_rect.width,
+                           view->terminal_rect.height,
+                           view->double_repaint,
+                           terminal_font,
+                           view->terminal_border);
+  grub_gfxterm_decorator_hook = grub_gfxmenu_draw_terminal_box;
+}
+
+static void
+init_background (grub_gfxmenu_view_t view)
+{
+  if (view->scaled_desktop_image || (!view->raw_desktop_image))
+    return;
+
+  struct grub_video_bitmap *scaled_bitmap;
+  if (view->desktop_image_scale_method ==
+      GRUB_VIDEO_BITMAP_SELECTION_METHOD_STRETCH)
+    grub_video_bitmap_create_scaled (&scaled_bitmap,
+                                     view->screen.width,
+                                     view->screen.height,
+                                     view->raw_desktop_image,
+                                     GRUB_VIDEO_BITMAP_SCALE_METHOD_BEST);
+  else
+    grub_video_bitmap_scale_proportional (&scaled_bitmap,
+                                          view->screen.width,
+                                          view->screen.height,
+                                          view->raw_desktop_image,
+                                          GRUB_VIDEO_BITMAP_SCALE_METHOD_BEST,
+                                          view->desktop_image_scale_method,
+                                          view->desktop_image_v_align,
+                                          view->desktop_image_h_align);
+  if (! scaled_bitmap)
+    return;
+  view->scaled_desktop_image = scaled_bitmap;
+
+}
+
+/* FIXME: previously notifications were displayed in special case.
+   Is it necessary?
+ */
+#if 0
+/* Sets MESSAGE as the progress message for the view.
+   MESSAGE can be 0, in which case no message is displayed.  */
+static void
+set_progress_message (grub_gfxmenu_view_t view, const char *message)
+{
+  grub_free (view->progress_message_text);
+  if (message)
+    view->progress_message_text = grub_strdup (message);
+  else
+    view->progress_message_text = 0;
+}
+
+static void
+notify_booting (grub_menu_entry_t entry, void *userdata)
+{
+  grub_gfxmenu_view_t view = (grub_gfxmenu_view_t) userdata;
+
+  char *s = grub_malloc (100 + grub_strlen (entry->title));
+  if (!s)
+    return;
+
+  grub_sprintf (s, "Booting '%s'", entry->title);
+  set_progress_message (view, s);
+  grub_free (s);
+  grub_gfxmenu_view_redraw (view, &view->progress_message_frame);
+  grub_video_swap_buffers ();
+  if (view->double_repaint)
+    grub_gfxmenu_view_redraw (view, &view->progress_message_frame);
+}
+
+static void
+notify_fallback (grub_menu_entry_t entry, void *userdata)
+{
+  grub_gfxmenu_view_t view = (grub_gfxmenu_view_t) userdata;
+
+  char *s = grub_malloc (100 + grub_strlen (entry->title));
+  if (!s)
+    return;
+
+  grub_sprintf (s, "Falling back to '%s'", entry->title);
+  set_progress_message (view, s);
+  grub_free (s);
+  grub_gfxmenu_view_redraw (view, &view->progress_message_frame);
+  grub_video_swap_buffers ();
+  if (view->double_repaint)
+    grub_gfxmenu_view_redraw (view, &view->progress_message_frame);
+}
+
+static void
+notify_execution_failure (void *userdata __attribute__ ((unused)))
+{
+}
+
+
+static struct grub_menu_execute_callback execute_callback =
+{
+  .notify_booting = notify_booting,
+  .notify_fallback = notify_fallback,
+  .notify_failure = notify_execution_failure
+};
+
+#endif