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

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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.
This commit is contained in:
Franklin Wei
2020-07-06 22:06:30 -04:00
committed by Simon Tatham
parent 9aa7b7cdfb
commit 78bc9ea7f7
47 changed files with 740 additions and 0 deletions
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22
cube.c
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@ -1535,6 +1535,27 @@ static void game_free_drawstate(drawing *dr, game_drawstate *ds)
sfree(ds);
}
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)
{
struct bbox bb;
bb.l = 2.0F * (params->d1 + params->d2);
bb.r = -2.0F * (params->d1 + params->d2);
bb.u = 2.0F * (params->d1 + params->d2);
bb.d = -2.0F * (params->d1 + params->d2);
find_bbox_callback(&bb, state->grid->squares + state->current);
*x = ((int)(bb.l * GRID_SCALE) + ds->ox);
*y = ((int)(bb.u * GRID_SCALE) + ds->oy);
*w = (bb.r - bb.l) * GRID_SCALE;
*h = (bb.d - bb.u) * GRID_SCALE;
}
static void game_redraw(drawing *dr, game_drawstate *ds,
const game_state *oldstate, const game_state *state,
int dir, const game_ui *ui,
@ -1762,6 +1783,7 @@ 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,
true, /* wants_statusbar */