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[core] Render parent raster tiles when ideal tile can't be loaded

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This commit is contained in:
Konstantin Käfer
2017-04-19 18:25:50 +02:00
parent 7ddca3b611
commit 9a9408e811
10 changed files with 101 additions and 37 deletions
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15
src/mbgl/algorithm/update_renderables.hpp
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@@ -43,7 +43,9 @@ void updateRenderables(GetTileFn getTile,
retainTile(*tile, Resource::Necessity::Required);
renderTile(idealRenderTileID, *tile);
} else {
bool triedPrevious = tile->hasTriedOptional();
// We are now attempting to load child and parent tiles.
bool parentHasTriedOptional = tile->hasTriedOptional();
bool parentIsLoaded = tile->isLoaded();
// The tile isn't loaded yet, but retain it anyway because it's an ideal tile.
retainTile(*tile, Resource::Necessity::Required);
@@ -91,13 +93,18 @@ void updateRenderables(GetTileFn getTile,
}
tile = getTile(parentDataTileID);
if (!tile && triedPrevious) {
if (!tile && (parentHasTriedOptional || parentIsLoaded)) {
tile = createTile(parentDataTileID);
}
if (tile) {
triedPrevious = tile->hasTriedOptional();
retainTile(*tile, Resource::Necessity::Optional);
retainTile(*tile, parentIsLoaded ? Resource::Necessity::Required
: Resource::Necessity::Optional);
// Save the current values, since they're the parent of the next iteration
// of the parent tile ascent loop.
parentHasTriedOptional = tile->hasTriedOptional();
parentIsLoaded = tile->isLoaded();
if (tile->isRenderable()) {
renderTile(parentRenderTileID, *tile);