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[core] load parents of missing tiles as optional

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This commit is contained in:
Konstantin Käfer
2016-05-27 17:01:12 +02:00
parent fce5dd5f6a
commit 4e5d065000
3 changed files with 664 additions and 371 deletions
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30
src/mbgl/algorithm/update_renderables.hpp
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@@ -33,17 +33,19 @@ void updateRenderables(GetTileDataFn getTileData,
const OverscaledTileID idealDataTileID(dataTileZoom, idealRenderTileID.canonical);
auto data = getTileData(idealDataTileID);
if (!data) {
data = createTileData(idealDataTileID, true);
data = createTileData(idealDataTileID);
assert(data);
}
// if (source has the tile and bucket is loaded) {
if (data->isRenderable()) {
retainTileData(*data);
retainTileData(*data, true);
renderTile(idealRenderTileID, *data);
} else {
bool triedPrevious = data->hasTriedOptional();
// The tile isn't loaded yet, but retain it anyway because it's an ideal tile.
retainTileData(*data);
retainTileData(*data, true);
covered = true;
overscaledZ = dataTileZoom + 1;
if (overscaledZ > info.maxZoom) {
@@ -51,7 +53,7 @@ void updateRenderables(GetTileDataFn getTileData,
const auto childDataTileID = idealDataTileID.scaledTo(overscaledZ);
data = getTileData(childDataTileID);
if (data && data->isRenderable()) {
retainTileData(*data);
retainTileData(*data, false);
renderTile(idealRenderTileID, *data);
} else {
covered = false;
@@ -62,7 +64,7 @@ void updateRenderables(GetTileDataFn getTileData,
const OverscaledTileID childDataTileID(overscaledZ, childTileID);
data = getTileData(childDataTileID);
if (data && data->isRenderable()) {
retainTileData(*data);
retainTileData(*data, false);
renderTile(childDataTileID.unwrapTo(idealRenderTileID.wrap), *data);
} else {
// At least one child tile doesn't exist, so we are going to look for
@@ -88,11 +90,19 @@ void updateRenderables(GetTileDataFn getTileData,
}
data = getTileData(parentDataTileID);
if (data && data->isRenderable()) {
retainTileData(*data);
renderTile(parentRenderTileID, *data);
// Break parent tile ascent, since we found one.
break;
if (!data && triedPrevious) {
data = createTileData(parentDataTileID);
}
if (data) {
triedPrevious = data->hasTriedOptional();
retainTileData(*data, false);
if (data->isRenderable()) {
renderTile(parentRenderTileID, *data);
// Break parent tile ascent, since we found one.
break;
}
}
}
}