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Do not load tiles while interacting

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Especially on mobile devices, loading just a single tile can
cause major janks. During animations, it is fine to just skip
frames. But during user interaction (e.g. dragging), a more
instant visual feedback is desirable.
This commit is contained in:
ahocevar
2014-02-13 13:30:55 +01:00
parent 4d0d2500a2
commit 877e881a52
1 changed files with 12 additions and 9 deletions
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21
src/ol/map.js
View File

@@ -816,25 +816,28 @@ ol.Map.prototype.handlePostRender = function() {
// efficiently:
// * When the view is static we allow a large number of parallel tile loads
// to complete the frame as quickly as possible.
// * When animating or interacting, image loads can cause janks, so we reduce
// the maximum number of loads per frame and limit the number of parallel
// tile loads to remain reactive to view changes and to reduce the chance of
// loading tiles that will quickly disappear from view.
// * Image loads can cause janks. So when animating, we reduce the maximum
// number of loads per frame and limit the number of parallel tile loads to
// remain reactive to view changes and to reduce the chance of loading
// tiles that will quickly disappear from view. When interacting, we do not
// load any tiles at all.
var tileQueue = this.tileQueue_;
if (!tileQueue.isEmpty()) {
var maxTotalLoading = 16;
var maxNewLoads = maxTotalLoading;
var tileSourceCount = 0;
var wantedTileSourcesCount = 0;
if (!goog.isNull(frameState)) {
var hints = frameState.viewHints;
if (hints[ol.ViewHint.ANIMATING] || hints[ol.ViewHint.INTERACTING]) {
if (hints[ol.ViewHint.ANIMATING]) {
maxTotalLoading = 8;
maxNewLoads = 2;
}
tileSourceCount = goog.object.getCount(frameState.wantedTiles);
if (!hints[ol.ViewHint.INTERACTING]) {
wantedTileSourcesCount = goog.object.getCount(frameState.wantedTiles);
}
}
maxTotalLoading *= tileSourceCount;
maxNewLoads *= tileSourceCount;
maxTotalLoading *= wantedTileSourcesCount;
maxNewLoads *= wantedTileSourcesCount;
if (tileQueue.getTilesLoading() < maxTotalLoading) {
tileQueue.reprioritize(); // FIXME only call if view has changed
tileQueue.loadMoreTiles(maxTotalLoading, maxNewLoads);