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New tile image cache and tile queue improvements

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We now reuse tile images by maintaining a cache of image elements with a
simplified LRU expiry policy (by order, not by timestamp). The tile queue
is bypassed for images that are available in the cache, so they can be
rendered immediately. And the tile queue itself loads more than just one
image at a time now (2 per layer url).
This commit is contained in:
ahocevar
2012-11-16 16:19:59 +01:00
parent 810d9ea95d
commit 2ee362a79b
3 changed files with 125 additions and 23 deletions
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33
tests/Layer/Grid.html
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@@ -100,6 +100,39 @@
map.destroy();
}
function test_manageTileCache(t) {
t.plan(9);
var map = new OpenLayers.Map('map');
layer = new OpenLayers.Layer.WMS(name, "../../img/blank.gif", params, {
tileCacheSize: 12
});
map.addLayer(layer);
map.setCenter([16, 48], 9);
var firstInCache, sharedTile;
t.delay_call(2, function() {
t.eq(layer.tileCacheIndex.length, 12, "tiles cached");
t.ok(~OpenLayers.Util.indexOf(layer.tileCacheIndex, layer.grid[1][2].url), "tile found in cache");
t.ok(layer.tileCache[layer.grid[1][2].url] === layer.grid[1][2].imgDiv, "correct object cached");
firstInCache = layer.tileCache[layer.tileCacheIndex[0]];
sharedTile = layer.tileCache[layer.tileCacheIndex[11]];
map.setCenter([17, 47]);
});
t.delay_call(4, function() {
t.eq(layer.tileCacheIndex.length, 12, "tiles cached");
t.ok(layer.tileCache[layer.grid[1][2].url] === layer.grid[1][2].imgDiv, "correct object cached");
t.ok(!(firstInCache.getAttribute("src") in layer.tileCache), "old tile discarded");
t.ok(sharedTile.getAttribute("src") in layer.tileCache, "shared tile still in cache");
firstInCache = layer.tileCache[layer.tileCacheIndex[0]];
map.setCenter([16, 48]);
});
t.delay_call(6, function() {
t.ok(!(firstInCache.getAttribute("src") in layer.tileCache), "old tile discarded");
t.ok(sharedTile.getAttribute("src") in layer.tileCache, "shared tile still in cache");
});
}
function test_queueTileDraw(t) {
t.plan(3);
OpenLayers.Layer.Grid.prototype.queueTileDraw = origQueueTileDraw;