Add resize support to Allegro library (Windows port is ready).

+ Add acknowledge_resize() function.
+ Add set_resize_callback() function and RESIZE_DISPLAY_EVENT structure.

src/allegro/include/allegro/gfx.h

@@ -106,6 +106,7 @@ typedef struct GFX_DRIVER        /* creates and manages the screen bitmap */
    AL_METHOD(void, restore_video_state, (void));
    AL_METHOD(void, set_blender_mode, (int mode, int r, int g, int b, int a));
    AL_METHOD(GFX_MODE_LIST *, fetch_mode_list, (void));
+   AL_METHOD(struct BITMAP *, acknowledge_resize, (void));
    int w, h;                     /* physical (not virtual!) screen size */
    int linear;                   /* true if video memory is linear */
    long bank_size;               /* bank size, in bytes */
@@ -410,6 +411,7 @@ AL_FUNC(int, get_color_conversion, (void));
 AL_FUNC(void, request_refresh_rate, (int rate));
 AL_FUNC(int, get_refresh_rate, (void));
 AL_FUNC(int, set_gfx_mode, (int card, int w, int h, int v_w, int v_h));
+AL_FUNC(int, acknowledge_resize, (void));
 AL_FUNC(int, scroll_screen, (int x, int y));
 AL_FUNC(int, request_scroll, (int x, int y));
 AL_FUNC(int, poll_scroll, (void));

src/allegro/include/allegro/platform/aintwin.h

@@ -77,6 +77,7 @@ AL_VAR(int, wnd_height);
 AL_VAR(int, wnd_sysmenu);
 
 AL_FUNCPTR(void, user_close_proc, (void));
+AL_FUNCPTR(void, user_resize_proc, (RESIZE_DISPLAY_EVENT *ev));
 
 
 /* gfx synchronization */

src/allegro/include/allegro/system.h

@@ -32,6 +32,14 @@ struct BITMAP;
 struct GFX_VTABLE;
 struct GFX_MODE;
 
+typedef struct RESIZE_DISPLAY_EVENT
+{
+   int old_w, old_h;
+   int new_w, new_h;
+   int is_maximized : 1; /* 1 if this event is because the user maximized the window */
+   int is_restored : 1;  /* 1 if this event is because the user restored the window */
+} RESIZE_DISPLAY_EVENT;
+
 #define ALLEGRO_ERROR_SIZE 256
 
 AL_ARRAY(char, allegro_id);
@@ -95,7 +103,7 @@ AL_FUNC(void, allegro_exit, (void));
 AL_PRINTFUNC(void, allegro_message, (AL_CONST char *msg, ...), 1, 2);
 AL_FUNC(void, get_executable_name, (char *output, int size));
 AL_FUNC(int, set_close_button_callback, (AL_METHOD(void, proc, (void))));
-
+AL_FUNC(int, set_resize_callback, (AL_METHOD(void, proc, (RESIZE_DISPLAY_EVENT *ev))));
 
 AL_FUNC(void, check_cpu, (void));
 
@@ -207,6 +215,7 @@ typedef struct SYSTEM_DRIVER
    AL_METHOD(int, find_resource, (char *dest, AL_CONST char *resource, int size));
    AL_METHOD(void, set_window_title, (AL_CONST char *name));
    AL_METHOD(int, set_close_button_callback, (AL_METHOD(void, proc, (void))));
+   AL_METHOD(int, set_resize_callback, (AL_METHOD(void, proc, (RESIZE_DISPLAY_EVENT *ev))));
    AL_METHOD(void, message, (AL_CONST char *msg));
    AL_METHOD(void, assert, (AL_CONST char *msg));
    AL_METHOD(void, save_console_state, (void));

src/allegro/src/allegro.c

@@ -380,6 +380,9 @@ static int _install_allegro(int system_id, int *errno_ptr, int (*atexit_ptr)(voi
    /* disable close button */
    set_close_button_callback(NULL);
 
+   /* disable resize */
+   set_resize_callback(NULL);
+
    /* detect CPU type */
    check_cpu();
 
@@ -541,6 +544,22 @@ int set_close_button_callback(void (*proc)(void))
 
 
 
+/* set_resize_callback:
+ *  Installs a callback function to be called when the window is
+ *  resized.
+ */
+int set_resize_callback(void (*proc)(RESIZE_DISPLAY_EVENT *ev))
+{
+   ASSERT(system_driver);
+
+   if (system_driver->set_resize_callback)
+      return system_driver->set_resize_callback(proc);
+
+   return -1;
+}
+
+
+
 /* debug_exit:
  *  Closes the debugging output files.
  */
@@ -753,7 +772,7 @@ SYSTEM_DRIVER system_none =
    sys_none_exit,
    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
-   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
    sys_no_driver, sys_no_driver, sys_no_driver, sys_no_driver
 };
 

src/allegro/src/graphics.c

@@ -613,6 +613,35 @@ int set_gfx_mode(int card, int w, int h, int v_w, int v_h)
 
 
 
+int acknowledge_resize(void)
+{
+   ASSERT(system_driver);
+   ASSERT(gfx_driver);
+
+   TRACE(PREFIX_I "acknowledge_resize init.\n");
+
+   if (gfx_driver->acknowledge_resize) {
+      BITMAP *new_screen = gfx_driver->acknowledge_resize();
+      if (!new_screen) {
+	 TRACE(PREFIX_I "acknowledge_resize failed.\n");
+	 return -1;
+      }
+
+      TRACE(PREFIX_I "acknowledge_resize succeeded.\n");
+
+      screen = new_screen;
+
+      if (_al_linker_mouse)
+	_al_linker_mouse->set_mouse_etc();
+
+      return 0;
+   }
+
+   return 0;
+}
+
+
+
 /* _set_gfx_mode:
  *  Called by set_gfx_mode(). Separated to make a clear difference between
  *  the virtual GFX_SAFE driver and the rest. The allow_config parameter,

src/allegro/src/macosx/qzfull.m

@@ -77,6 +77,7 @@
    NULL,                         /* AL_METHOD(void, restore_video_state, (void)); */
    NULL,                         /* AL_METHOD(void, set_blender_mode, (int mode, int r, int g, int b, int a)); */
    osx_qz_fetch_mode_list,       /* AL_METHOD(int, fetch_mode_list, (void)); */
+   NULL,                         /* acknowledge_resize */
    0, 0,                         /* physical (not virtual!) screen size */
    TRUE,                         /* true if video memory is linear */
    0,                            /* bank size, in bytes */

src/allegro/src/macosx/qzwindow.m

@@ -88,6 +88,7 @@
    NULL,                         /* AL_METHOD(void, restore_video_state, (void)); */
    NULL,                         /* AL_METHOD(void, set_blender_mode, (int mode, int r, int g, int b, int a)); */
    NULL,                         /* AL_METHOD(int, fetch_mode_list, (void)); */
+   NULL,                         /* acknowledge_resize */
    0, 0,                         /* physical (not virtual!) screen size */
    TRUE,                         /* true if video memory is linear */
    0,                            /* bank size, in bytes */

src/allegro/src/macosx/system.m

@@ -98,6 +98,7 @@
    osx_sys_find_resource,
    osx_sys_set_window_title,
    osx_sys_set_close_button_callback,
+   NULL,  /* set_resize_callback */
    osx_sys_message,
    NULL,  /* AL_METHOD(void, assert, (AL_CONST char *msg)); */
    NULL,  /* AL_METHOD(void, save_console_state, (void)); */

src/allegro/src/misc/vbeaf.c

@@ -160,6 +160,7 @@ GFX_DRIVER gfx_vbeaf =
    vbeaf_restore,
    NULL,                         /* AL_METHOD(void, set_blender_mode, (int mode, int r, int g, int b, int a)); */
    vbeaf_fetch_mode_list,        /* fetch mode hook */
+   NULL,			 /* acknowledge_resize */
    0, 0, FALSE, 0, 0, 0, 0, FALSE
 };
 

src/allegro/src/misc/vga.c

@@ -63,6 +63,7 @@ GFX_DRIVER gfx_vga =
    _restore_vga_mode,
    NULL,                         /* AL_METHOD(void, set_blender_mode, (int mode, int r, int g, int b, int a)); */
    vga_fetch_mode_list,
+   NULL,			/* acknowledge_resize */
    320, 200,
    TRUE,
    0, 0,

src/allegro/src/mouse.c

@@ -1014,7 +1014,9 @@ static void set_mouse_etc(void)
 
    set_mouse_range(0, 0, SCREEN_W-1, SCREEN_H-1);
    set_mouse_speed(2, 2);
-   position_mouse(SCREEN_W/2, SCREEN_H/2);
+
+   /* As now we support window resizing, it's not recommended to change the mouse position. */
+   /*position_mouse(SCREEN_W/2, SCREEN_H/2);*/
 }
 
 

src/allegro/src/win/wddfull.c

@@ -56,6 +56,7 @@ GFX_DRIVER gfx_directx_accel =
    NULL,                         // AL_METHOD(void, restore_video_state, (void*));
    NULL,                         // AL_METHOD(void, set_blender_mode, (int mode, int r, int g, int b, int a));
    gfx_directx_fetch_mode_list,
+   NULL,			 /* acknowledge_resize */
    0, 0,                         // physical (not virtual!) screen size
    TRUE,                         // true if video memory is linear
    0,                            // bank size, in bytes
@@ -95,6 +96,7 @@ GFX_DRIVER gfx_directx_soft =
    NULL,                        // AL_METHOD(void, restore_video_state, (void*));
    NULL,                        // AL_METHOD(void, set_blender_mode, (int mode, int r, int g, int b, int a));
    gfx_directx_fetch_mode_list,
+   NULL,			/* acknowledge_resize */
    0, 0,                        // physical (not virtual!) screen size
    TRUE,                        // true if video memory is linear
    0,                           // bank size, in bytes
@@ -129,6 +131,7 @@ GFX_DRIVER gfx_directx_safe =
    NULL,                        // AL_METHOD(void, restore_video_state, (void*));
    NULL,                        // AL_METHOD(void, set_blender_mode, (int mode, int r, int g, int b, int a));
    gfx_directx_fetch_mode_list,
+   NULL,			/* acknowledge_resize */
    0, 0,                        // physical (not virtual!) screen size
    TRUE,                        // true if video memory is linear
    0,                           // bank size, in bytes

src/allegro/src/win/wddovl.c

@@ -58,6 +58,7 @@ GFX_DRIVER gfx_directx_ovl =
    NULL,                        // AL_METHOD(void, restore_video_state, (void*));
    NULL,                        // AL_METHOD(void, set_blender_mode, (int mode, int r, int g, int b, int a));
    NULL,                        // AL_METHOD(int, fetch_mode_list, (void));
+   NULL,			/* acknowledge_resize */
    0, 0,                        // int w, h;                     /* physical (not virtual!) screen size */
    TRUE,                        // int linear;                   /* true if video memory is linear */
    0,                           // long bank_size;               /* bank size, in bytes */