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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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32
galaxies.c
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@ -3469,6 +3469,37 @@ 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->cur_visible) {
space *sp = &SPACE(state, ui->cur_x, ui->cur_y);
if(sp->flags & F_DOT) {
*x = SCOORD(ui->cur_x) - DOT_SIZE;
*y = SCOORD(ui->cur_y) - DOT_SIZE;
*w = *h = 2 * DOT_SIZE + 1;
} else if(sp->type != s_tile) {
int dx = (ui->cur_x % 2) ? CURSOR_SIZE : CURSOR_SIZE/3;
int dy = (ui->cur_y % 2) ? CURSOR_SIZE : CURSOR_SIZE/3;
int x1 = SCOORD(ui->cur_x)-dx, y1 = SCOORD(ui->cur_y)-dy;
int xs = dx*2+1, ys = dy*2+1;
*x = x1;
*y = y1;
*w = xs;
*h = ys;
} else {
*x = SCOORD(ui->cur_x) - CURSOR_SIZE;
*y = SCOORD(ui->cur_y) - CURSOR_SIZE;
*w = *h = 2 * CURSOR_SIZE + 1;
}
}
}
static int game_status(const game_state *state)
{
return state->completed ? +1 : 0;
@ -3695,6 +3726,7 @@ const struct game thegame = {
game_redraw,
game_anim_length,
game_flash_length,
game_get_cursor_location,
game_status,
#ifdef EDITOR
false, false, NULL, NULL,