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Speed up filtering of which viewport labels should be displayed.

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Add an inline, fast, inaccurate check to catch most off-screen labels,
before the relatively slow and expensive checks.
This commit is contained in:
Jonathan G Rennison
2016-01-01 21:53:58 +00:00
parent 5aad0b51a3
commit 726b5cb4f6
1 changed files with 27 additions and 0 deletions
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27
src/viewport.cpp
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@@ -1304,12 +1304,31 @@ void ViewportAddString(const DrawPixelInfo *dpi, ZoomLevel small_from, const Vie
}
}
struct ViewportAddStringApproxBoundsChecker {
int top;
int bottom;
ViewportAddStringApproxBoundsChecker(const DrawPixelInfo *dpi)
{
this->top = dpi->top - ScaleByZoom(VPSM_TOP + FONT_HEIGHT_NORMAL + VPSM_BOTTOM, dpi->zoom);
this->bottom = dpi->top + dpi->height;
}
bool IsSignMaybeOnScreen(const ViewportSign *sign) const
{
return !(this->bottom < sign->top || this->top > sign->top);
}
};
static void ViewportAddTownNames(DrawPixelInfo *dpi)
{
if (!HasBit(_display_opt, DO_SHOW_TOWN_NAMES) || _game_mode == GM_MENU) return;
ViewportAddStringApproxBoundsChecker checker(dpi);
const Town *t;
FOR_ALL_TOWNS(t) {
if (!checker.IsSignMaybeOnScreen(&t->cache.sign)) continue;
ViewportAddString(dpi, ZOOM_LVL_OUT_16X, &t->cache.sign,
t->Label(), t->SmallLabel(), STR_VIEWPORT_TOWN_TINY_BLACK,
t->index, t->cache.population);
@@ -1321,6 +1340,8 @@ static void ViewportAddStationNames(DrawPixelInfo *dpi)
{
if (!(HasBit(_display_opt, DO_SHOW_STATION_NAMES) || HasBit(_display_opt, DO_SHOW_WAYPOINT_NAMES)) || _game_mode == GM_MENU) return;
ViewportAddStringApproxBoundsChecker checker(dpi);
const BaseStation *st;
FOR_ALL_BASE_STATIONS(st) {
/* Check whether the base station is a station or a waypoint */
@@ -1332,6 +1353,8 @@ static void ViewportAddStationNames(DrawPixelInfo *dpi)
/* Don't draw if station is owned by another company and competitor station names are hidden. Stations owned by none are never ignored. */
if (!HasBit(_display_opt, DO_SHOW_COMPETITOR_SIGNS) && _local_company != st->owner && st->owner != OWNER_NONE) continue;
if (!checker.IsSignMaybeOnScreen(&st->sign)) continue;
ViewportAddString(dpi, ZOOM_LVL_OUT_16X, &st->sign,
is_station ? STR_VIEWPORT_STATION : STR_VIEWPORT_WAYPOINT,
(is_station ? STR_VIEWPORT_STATION : STR_VIEWPORT_WAYPOINT) + 1, STR_NULL,
@@ -1345,6 +1368,8 @@ static void ViewportAddSigns(DrawPixelInfo *dpi)
/* Signs are turned off or are invisible */
if (!HasBit(_display_opt, DO_SHOW_SIGNS) || IsInvisibilitySet(TO_SIGNS)) return;
ViewportAddStringApproxBoundsChecker checker(dpi);
const Sign *si;
FOR_ALL_SIGNS(si) {
/* Don't draw if sign is owned by another company and competitor signs should be hidden.
@@ -1352,6 +1377,8 @@ static void ViewportAddSigns(DrawPixelInfo *dpi)
* companies can leave OWNER_NONE signs after them. */
if (!HasBit(_display_opt, DO_SHOW_COMPETITOR_SIGNS) && _local_company != si->owner && si->owner != OWNER_DEITY) continue;
if (!checker.IsSignMaybeOnScreen(&si->sign)) continue;
ViewportAddString(dpi, ZOOM_LVL_OUT_16X, &si->sign,
STR_WHITE_SIGN,
(IsTransparencySet(TO_SIGNS) || si->owner == OWNER_DEITY) ? STR_VIEWPORT_SIGN_SMALL_WHITE : STR_VIEWPORT_SIGN_SMALL_BLACK, STR_NULL,