diff --git a/src/ol/renderer/canvas/canvastilelayerrenderer.js b/src/ol/renderer/canvas/canvastilelayerrenderer.js
index a6e5519ec2..b99be5e1ca 100644
--- a/src/ol/renderer/canvas/canvastilelayerrenderer.js
+++ b/src/ol/renderer/canvas/canvastilelayerrenderer.js
@@ -10,6 +10,7 @@ goog.require('ol.Extent');
goog.require('ol.Size');
goog.require('ol.Tile');
goog.require('ol.TileCoord');
+goog.require('ol.TileRange');
goog.require('ol.TileState');
goog.require('ol.layer.TileLayer');
goog.require('ol.renderer.Map');
@@ -51,6 +52,18 @@ ol.renderer.canvas.TileLayer = function(mapRenderer, tileLayer) {
*/
this.transform_ = goog.vec.Mat4.createNumber();
+ /**
+ * @private
+ * @type {number}
+ */
+ this.renderedCanvasZ_ = NaN;
+
+ /**
+ * @private
+ * @type {ol.TileRange}
+ */
+ this.renderedCanvasTileRange_ = null;
+
/**
* @private
* @type {Array.
}
@@ -118,7 +131,8 @@ ol.renderer.canvas.TileLayer.prototype.renderFrame =
var tileRangeHeight = tileRange.getHeight();
var canvasSize = new ol.Size(
- tileSize.width * tileRangeWidth, tileSize.height * tileRangeHeight);
+ tileSize.width * tileRange.getWidth(),
+ tileSize.height * tileRange.getHeight());
var canvas, context;
if (goog.isNull(this.canvas_)) {
@@ -130,18 +144,45 @@ ol.renderer.canvas.TileLayer.prototype.renderFrame =
this.canvas_ = canvas;
this.canvasSize_ = canvasSize;
this.context_ = context;
- this.renderedTiles_ = new Array(tileRangeWidth * tileRangeHeight);
+ this.renderedCanvasTileRange_ = null;
} else {
canvas = this.canvas_;
context = this.context_;
- if (!this.canvasSize_.equals(canvasSize)) {
+ if (this.canvasSize_.width < canvasSize.width ||
+ this.canvasSize_.height < canvasSize.height) {
canvas.width = canvasSize.width;
canvas.height = canvasSize.height;
this.canvasSize_ = canvasSize;
- this.renderedTiles_ = new Array(tileRangeWidth * tileRangeHeight);
+ this.renderedCanvasTileRange_ = null;
+ } else if (z != this.renderedCanvasZ_ ||
+ !this.renderedCanvasTileRange_.containsTileRange(tileRange)) {
+ this.renderedCanvasTileRange_ = null;
}
}
+ var canvasTileRange, canvasTileRangeWidth, minX, minY;
+ if (z != this.renderedCanvasZ_ ||
+ goog.isNull(this.renderedCanvasTileRange_)) {
+ canvasTileRangeWidth = canvasSize.width / tileSize.width;
+ var canvasTileRangeHeight = canvasSize.height / tileSize.height;
+ minX = tileRange.minX +
+ Math.floor((canvasTileRangeWidth - tileRange.getWidth()) / 2);
+ minY = tileRange.minY +
+ Math.floor((canvasTileRangeHeight - tileRange.getHeight()) / 2);
+ this.renderedCanvasZ_ = z;
+ this.renderedCanvasTileRange_ = new ol.TileRange(
+ minX, minY,
+ minX + canvasTileRangeWidth - 1, minY + canvasTileRangeHeight - 1);
+ this.renderedTiles_ =
+ new Array(canvasTileRangeWidth * canvasTileRangeHeight);
+ canvasTileRange = this.renderedCanvasTileRange_;
+ } else {
+ canvasTileRange = this.renderedCanvasTileRange_;
+ canvasTileRangeWidth = canvasTileRange.getWidth();
+ }
+
+ goog.asserts.assert(canvasTileRange.containsTileRange(tileRange));
+
/**
* @type {Object.>}
*/
@@ -178,10 +219,10 @@ ol.renderer.canvas.TileLayer.prototype.renderFrame =
var zs = goog.array.map(goog.object.getKeys(tilesToDrawByZ), Number);
goog.array.sort(zs);
var opaque = tileSource.getOpaque();
- var origin = tileGrid.getTileCoordExtent(
- new ol.TileCoord(z, tileRange.minX, tileRange.maxY)).getTopLeft();
+ var origin = tileGrid.getTileCoordExtent(new ol.TileCoord(
+ z, canvasTileRange.minX, canvasTileRange.maxY)).getTopLeft();
var currentZ, i, index, scale, tileCoordKey, tileExtent, tilesToDraw;
- var ix, iy, interimTileExtent, interimTileRange, maxX, maxY, minX, minY;
+ var ix, iy, interimTileExtent, interimTileRange, maxX, maxY;
var height, width;
for (i = 0; i < zs.length; ++i) {
currentZ = zs[i];
@@ -190,11 +231,12 @@ ol.renderer.canvas.TileLayer.prototype.renderFrame =
if (currentZ == z) {
for (tileCoordKey in tilesToDraw) {
tile = tilesToDraw[tileCoordKey];
- index = (tile.tileCoord.y - tileRange.minY) * tileRangeWidth +
- (tile.tileCoord.x - tileRange.minX);
+ index =
+ (tile.tileCoord.y - canvasTileRange.minY) * canvasTileRangeWidth +
+ (tile.tileCoord.x - canvasTileRange.minX);
if (this.renderedTiles_[index] != tile) {
- x = tileSize.width * (tile.tileCoord.x - tileRange.minX);
- y = tileSize.height * (tileRange.maxY - tile.tileCoord.y);
+ x = tileSize.width * (tile.tileCoord.x - canvasTileRange.minX);
+ y = tileSize.height * (canvasTileRange.maxY - tile.tileCoord.y);
tileState = tile.getState();
if (tileState == ol.TileState.EMPTY || !opaque) {
context.clearRect(x, y, tileSize.width, tileSize.height);
@@ -223,14 +265,15 @@ ol.renderer.canvas.TileLayer.prototype.renderFrame =
}
interimTileRange =
tileGrid.getTileRangeForExtentAndZ(tileExtent, z);
- minX = Math.max(interimTileRange.minX, tileRange.minX);
- maxX = Math.min(interimTileRange.maxX, tileRange.maxX);
- minY = Math.max(interimTileRange.minY, tileRange.minY);
- maxY = Math.min(interimTileRange.maxY, tileRange.maxY);
+ minX = Math.max(interimTileRange.minX, canvasTileRange.minX);
+ maxX = Math.min(interimTileRange.maxX, canvasTileRange.maxX);
+ minY = Math.max(interimTileRange.minY, canvasTileRange.minY);
+ maxY = Math.min(interimTileRange.maxY, canvasTileRange.maxY);
for (ix = minX; ix <= maxX; ++ix) {
for (iy = minY; iy <= maxY; ++iy) {
- this.renderedTiles_[(iy - tileRange.minY) * tileRangeWidth +
- (ix - tileRange.minX)] = undefined;
+ index = (iy - canvasTileRange.minY) * canvasTileRangeWidth +
+ (ix - canvasTileRange.minX);
+ this.renderedTiles_[index] = undefined;
}
}
}