Add method for frontends to query the backend's cursor location.

The Rockbox frontend allows games to be displayed in a "zoomed-in"
state targets with small displays. Currently we use a modal interface
-- a "viewing" mode in which the cursor keys are used to pan around
the rendered bitmap; and an "interaction" mode that actually sends
keys to the game.

This commit adds a midend_get_cursor_location() function to allow the
frontend to retrieve the backend's cursor location or other "region of
interest" -- such as the player location in Cube or Inertia.

With this information, the Rockbox frontend can now intelligently
follow the cursor around in the zoomed-in state, eliminating the need
for a modal interface.

1 files changed, 15 insertions, 0 deletions

diff --git a/guess.c b/guess.c
index e5ebd55..a501579 100644
--- a/guess.c
+++ b/guess.c
@@ -1448,6 +1448,20 @@ static float game_flash_length(const game_state *oldstate,
     return 0.0F;
 }
 
+static void game_get_cursor_location(const game_ui *ui,
+                                     const game_drawstate *ds,
+                                     const game_state *state,
+                                     const game_params *params,
+                                     int *x, int *y, int *w, int *h)
+{
+    if(ui->display_cur && !state->solved) {
+        *x = GUESS_X(state->next_go, ui->peg_cur) - CGAP;
+        *y = GUESS_Y(state->next_go, ui->peg_cur) - CGAP;
+
+        *w = *h = 2 * (PEGRAD + CGAP) + 1;
+    }
+}
+
 static int game_status(const game_state *state)
 {
     /*
@@ -1508,6 +1522,7 @@ const struct game thegame = {
     game_redraw,
     game_anim_length,
     game_flash_length,
+    game_get_cursor_location,
     game_status,
     false, false, game_print_size, game_print,
     false,			       /* wants_statusbar */