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Replace getTile with getTileZXY

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This massively reduces the number of temporary ol.TileCoord objects.

Previously an ol.TileCoord object was generated for every potentially
visible tile at the current zoom level and lower, every frame.  This
commit eliminates all of those.  Now new ol.TileCoord objects are only
allocated when a new tile is created.
This commit is contained in:
Tom Payne
2013-03-24 14:51:54 +01:00
parent 247fc8f031
commit dfb631a08f
9 changed files with 87 additions and 75 deletions
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23
src/ol/source/tilesource.js
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@@ -72,8 +72,8 @@ ol.source.TileSource.prototype.expireCache = goog.abstractMethod;
*
* @param {Object.<number, Object.<string, ol.Tile>>} loadedTilesByZ A lookup of
* loaded tiles by zoom level.
* @param {function(ol.TileCoord): ol.Tile} getTileIfLoaded A function that
* returns the tile only if it is fully loaded.
* @param {function(number, number, number): ol.Tile} getTileIfLoaded A function
* that returns the tile only if it is fully loaded.
* @param {number} z Zoom level.
* @param {ol.TileRange} tileRange Tile range.
* @return {boolean} The tile range is fully covered with loaded tiles.
@@ -82,15 +82,14 @@ ol.source.TileSource.prototype.findLoadedTiles = function(loadedTilesByZ,
getTileIfLoaded, z, tileRange) {
// FIXME this could be more efficient about filling partial holes
var fullyCovered = true;
var tile, tileCoord, tileCoordKey, x, y;
var tile, tileCoordKey, x, y;
for (x = tileRange.minX; x <= tileRange.maxX; ++x) {
for (y = tileRange.minY; y <= tileRange.maxY; ++y) {
tileCoord = new ol.TileCoord(z, x, y);
tileCoordKey = tileCoord.toString();
tileCoordKey = ol.TileCoord.getKeyZXY(z, x, y);
if (loadedTilesByZ[z] && loadedTilesByZ[z][tileCoordKey]) {
continue;
}
tile = getTileIfLoaded(tileCoord);
tile = getTileIfLoaded(z, x, y);
if (!goog.isNull(tile)) {
if (!loadedTilesByZ[z]) {
loadedTilesByZ[z] = {};
@@ -122,12 +121,14 @@ ol.source.TileSource.prototype.getResolutions = function() {
/**
* @param {ol.TileCoord} tileCoord Tile coordinate.
* @param {number} z Tile coordinate z.
* @param {number} x Tile coordinate x.
* @param {number} y Tile coordinate y.
* @param {ol.tilegrid.TileGrid=} opt_tileGrid Tile grid.
* @param {ol.Projection=} opt_projection Projection.
* @return {!ol.Tile} Tile.
*/
ol.source.TileSource.prototype.getTile = goog.abstractMethod;
ol.source.TileSource.prototype.getTileZXY = goog.abstractMethod;
/**
@@ -140,6 +141,8 @@ ol.source.TileSource.prototype.getTileGrid = function() {
/**
* Marks a tile coord as being used, without triggering a load.
* @param {string} tileCoordKey Tile coordinate key.
* @param {number} z Tile coordinate z.
* @param {number} x Tile coordinate x.
* @param {number} y Tile coordinate y.
*/
ol.source.TileSource.prototype.useTile = goog.nullFunction;
ol.source.TileSource.prototype.useTileZXY = goog.nullFunction;