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Improve background cache logic. Fixes #411

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This commit is contained in:
Tom MacWright
2013-01-16 17:36:45 -05:00
parent ad6de1437f
commit 1c757a7c20
1 changed files with 30 additions and 7 deletions
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js/id/renderer/background.js
+30 -7
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@@ -55,14 +55,36 @@ iD.Background = function() {
ups = {};
tiles.forEach(function(d) {
d.push(source(d));
// this tile has not been loaded yet
if (!cache[d] &&
cache[atZoom(d, -1)] &&
// if this tile has already failed, do
// not request it
if (cache[d] !== false) d.push(source(d));
// if this tile has failed, try to request its tile above
if (cache[d] === false &&
cache[atZoom(d, -1)] !== false &&
!ups[atZoom(d, -1)]) {
ups[atZoom(d, -1)] = true;
tiles.push(atZoom(d, -1));
} else if (!cache[d]) {
// if this tile has not finished, req the one above
} else if (cache[d] === undefined &&
// but the tile above is in the cache
cache[atZoom(d, -1)] &&
// and another tile has not already requested the
// tile above
!ups[atZoom(d, -1)]) {
ups[atZoom(d, -1)] = true;
tiles.push(atZoom(d, -1));
// if this tile has not yet completed, try keeping the
// tiles below it
} else if (cache[d] === undefined ||
cache[d] === false) {
upZoom(d, 1).forEach(function(u) {
if (cache[u] && !ups[u]) {
ups[u] = true;
@@ -79,11 +101,12 @@ iD.Background = function() {
image.exit().remove();
function load(d) {
cache[d] = true;
cache[d.slice(0, 3)] = true;
d3.select(this).on('load', null);
}
function error() {
function error(d) {
cache[d.slice(0, 3)] = false;
d3.select(this).remove();
}