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ui: Shorten references into InputEvent

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An upcoming patch will alter how simple unions, like InputEvent, are
laid out, which will impact all lines of the form 'evt->u.XXX'
(expanding it to the longer 'evt->u.XXX.data').  For better
legibility in that patch, and less need for line wrapping, it's better
to use a temporary variable to reduce the effect of a layout change to
just the variable initializations, rather than every reference within
an InputEvent.

There was one instance in hid.c:hid_pointer_event() where the code
was referring to evt->u.rel inside the case label where evt->u.abs
is the correct name; thankfully, both members of the union have the
same type, so it happened to work, but it is now cleaner.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1457021813-10704-8-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Eric Blake 2016-03-03 09:16:49 -07:00 • committed by Markus Armbruster
parent 0399293e5b
commit b5a1b44318
7 changed files with 129 additions and 89 deletions
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36
hw/input/hid.c
View file

@ -116,37 +116,42 @@ static void hid_pointer_event(DeviceState *dev, QemuConsole *src,
};
HIDState *hs = (HIDState *)dev;
HIDPointerEvent *e;
InputMoveEvent *move;
InputBtnEvent *btn;
assert(hs->n < QUEUE_LENGTH);
e = &hs->ptr.queue[(hs->head + hs->n) & QUEUE_MASK];
switch (evt->type) {
case INPUT_EVENT_KIND_REL:
if (evt->u.rel->axis == INPUT_AXIS_X) {
e->xdx += evt->u.rel->value;
} else if (evt->u.rel->axis == INPUT_AXIS_Y) {
e->ydy += evt->u.rel->value;
move = evt->u.rel;
if (move->axis == INPUT_AXIS_X) {
e->xdx += move->value;
} else if (move->axis == INPUT_AXIS_Y) {
e->ydy += move->value;
}
break;
case INPUT_EVENT_KIND_ABS:
if (evt->u.rel->axis == INPUT_AXIS_X) {
e->xdx = evt->u.rel->value;
} else if (evt->u.rel->axis == INPUT_AXIS_Y) {
e->ydy = evt->u.rel->value;
move = evt->u.abs;
if (move->axis == INPUT_AXIS_X) {
e->xdx = move->value;
} else if (move->axis == INPUT_AXIS_Y) {
e->ydy = move->value;
}
break;
case INPUT_EVENT_KIND_BTN:
if (evt->u.btn->down) {
e->buttons_state |= bmap[evt->u.btn->button];
if (evt->u.btn->button == INPUT_BUTTON_WHEEL_UP) {
btn = evt->u.btn;
if (btn->down) {
e->buttons_state |= bmap[btn->button];
if (btn->button == INPUT_BUTTON_WHEEL_UP) {
e->dz--;
} else if (evt->u.btn->button == INPUT_BUTTON_WHEEL_DOWN) {
} else if (btn->button == INPUT_BUTTON_WHEEL_DOWN) {
e->dz++;
}
} else {
e->buttons_state &= ~bmap[evt->u.btn->button];
e->buttons_state &= ~bmap[btn->button];
}
break;
@ -223,9 +228,10 @@ static void hid_keyboard_event(DeviceState *dev, QemuConsole *src,
HIDState *hs = (HIDState *)dev;
int scancodes[3], i, count;
int slot;
InputKeyEvent *key = evt->u.key;
count = qemu_input_key_value_to_scancode(evt->u.key->key,
evt->u.key->down,
count = qemu_input_key_value_to_scancode(key->key,
key->down,
scancodes);
if (hs->n + count > QUEUE_LENGTH) {
fprintf(stderr, "usb-kbd: warning: key event queue full\n");