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Only request tiles within the layer extent

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Layer renderers are now responsible for requesting data within a limited extent.
This commit is contained in:
Tim Schaub
2014-07-06 23:30:59 -06:00
parent 234cff4de5
commit 2b0284a342
9 changed files with 38 additions and 11 deletions
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10
src/ol/renderer/canvas/canvastilelayerrenderer.js
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@@ -193,6 +193,11 @@ ol.renderer.canvas.TileLayer.prototype.prepareFrame =
} else {
extent = frameState.extent;
}
if (goog.isDef(layerState.extent)) {
extent = ol.extent.getIntersection(extent, layerState.extent);
}
var tileRange = tileGrid.getTileRangeForExtentAndResolution(
extent, tileResolution);
@@ -233,6 +238,11 @@ ol.renderer.canvas.TileLayer.prototype.prepareFrame =
if (z != this.renderedCanvasZ_ ||
!this.renderedCanvasTileRange_.containsTileRange(tileRange)) {
this.renderedCanvasTileRange_ = null;
// Due to limited layer extent, we may be rendering tiles on a small
// portion of the canvas.
if (z < this.renderedCanvasZ_) {
this.context_.clearRect(0, 0, canvasWidth, canvasHeight);
}
}
}
}

5
src/ol/renderer/dom/domtilelayerrenderer.js
View File

@@ -109,6 +109,11 @@ ol.renderer.dom.TileLayer.prototype.prepareFrame =
} else {
extent = frameState.extent;
}
if (goog.isDef(layerState.extent)) {
extent = ol.extent.getIntersection(extent, layerState.extent);
}
var tileRange = tileGrid.getTileRangeForExtentAndResolution(
extent, tileResolution);

11
src/ol/renderer/webgl/webgltilelayerrenderer.js
View File

@@ -207,11 +207,18 @@ ol.renderer.webgl.TileLayer.prototype.prepareFrame =
var allTilesLoaded = true;
var tmpExtent = ol.extent.createEmpty();
var tmpTileRange = new ol.TileRange(0, 0, 0, 0);
var childTileRange, fullyLoaded, tile, tileState, x, y;
var childTileRange, fullyLoaded, tile, tileState, x, y, tileExtent;
for (x = tileRange.minX; x <= tileRange.maxX; ++x) {
for (y = tileRange.minY; y <= tileRange.maxY; ++y) {
tile = tileSource.getTile(z, x, y, pixelRatio, projection);
if (goog.isDef(layerState.extent)) {
// ignore tiles outside layer extent
tileExtent = tileGrid.getTileCoordExtent(tile.tileCoord, tmpExtent);
if (!ol.extent.intersects(tileExtent, layerState.extent)) {
continue;
}
}
tileState = tile.getState();
if (tileState == ol.TileState.LOADED) {
if (mapRenderer.isTileTextureLoaded(tile)) {
@@ -243,7 +250,7 @@ ol.renderer.webgl.TileLayer.prototype.prepareFrame =
var zs = goog.array.map(goog.object.getKeys(tilesToDrawByZ), Number);
goog.array.sort(zs);
var u_tileOffset = goog.vec.Vec4.createFloat32();
var i, ii, sx, sy, tileExtent, tileKey, tilesToDraw, tx, ty;
var i, ii, sx, sy, tileKey, tilesToDraw, tx, ty;
for (i = 0, ii = zs.length; i < ii; ++i) {
tilesToDraw = tilesToDrawByZ[zs[i]];
for (tileKey in tilesToDraw) {