From 62f8846ce9a4c512a9343da0394b0f8157ba8c8b Mon Sep 17 00:00:00 2001
From: Ansis Brammanis <ansis@mapbox.com>
Date: Wed, 20 Dec 2017 16:14:13 -0500
Subject: fix regression and add test

---
 src/mbgl/text/cross_tile_symbol_index.cpp  |  4 +++
 test/text/cross_tile_symbol_index.test.cpp | 46 +++++++++++++++++++++++++++++-
 2 files changed, 49 insertions(+), 1 deletion(-)

diff --git a/src/mbgl/text/cross_tile_symbol_index.cpp b/src/mbgl/text/cross_tile_symbol_index.cpp
index 2536a3ca5c..6efded8e4a 100644
--- a/src/mbgl/text/cross_tile_symbol_index.cpp
+++ b/src/mbgl/text/cross_tile_symbol_index.cpp
@@ -64,6 +64,10 @@ bool CrossTileSymbolLayerIndex::addBucket(const OverscaledTileID& tileID, Symbol
         return false;
     }
 
+    for (auto& symbolInstance: bucket.symbolInstances) {
+        symbolInstance.crossTileID = 0;
+    }
+
     for (auto& it : indexes) {
         auto zoom = it.first;
         auto zoomIndexes = it.second;
diff --git a/test/text/cross_tile_symbol_index.test.cpp b/test/text/cross_tile_symbol_index.test.cpp
index b40827d63e..ef5bd4a101 100644
--- a/test/text/cross_tile_symbol_index.test.cpp
+++ b/test/text/cross_tile_symbol_index.test.cpp
@@ -18,6 +18,7 @@ SymbolInstance makeSymbolInstance(float x, float y, std::u16string key) {
 TEST(CrossTileSymbolLayerIndex, addBucket) {
 
     uint32_t maxCrossTileID = 0;
+    uint32_t maxBucketInstanceId = 0;
     CrossTileSymbolLayerIndex index;
 
     style::SymbolLayoutProperties::PossiblyEvaluated layout;
@@ -25,12 +26,12 @@ TEST(CrossTileSymbolLayerIndex, addBucket) {
     bool iconsNeedLinear = false;
     bool sortFeaturesByY = false;
 
-
     OverscaledTileID mainID(6, 0, 6, 8, 8);
     std::vector<SymbolInstance> mainInstances;
     mainInstances.push_back(makeSymbolInstance(1000, 1000, u"Detroit"));
     mainInstances.push_back(makeSymbolInstance(2000, 2000, u"Toronto"));
     SymbolBucket mainBucket { layout, {}, 16.0f, 1.0f, 0, sdfIcons, iconsNeedLinear, sortFeaturesByY, std::move(mainInstances) };
+    mainBucket.bucketInstanceId = ++maxBucketInstanceId;
     index.addBucket(mainID, mainBucket, maxCrossTileID);
 
     // Assigned new IDs
@@ -45,6 +46,7 @@ TEST(CrossTileSymbolLayerIndex, addBucket) {
     childInstances.push_back(makeSymbolInstance(3000, 3000, u"Toronto"));
     childInstances.push_back(makeSymbolInstance(4001, 4001, u"Toronto"));
     SymbolBucket childBucket { layout, {}, 16.0f, 1.0f, 0, sdfIcons, iconsNeedLinear, sortFeaturesByY, std::move(childInstances) };
+    childBucket.bucketInstanceId = ++maxBucketInstanceId;
     index.addBucket(childID, childBucket, maxCrossTileID);
 
     // matched parent tile
@@ -60,6 +62,7 @@ TEST(CrossTileSymbolLayerIndex, addBucket) {
     std::vector<SymbolInstance> parentInstances;
     parentInstances.push_back(makeSymbolInstance(500, 500, u"Detroit"));
     SymbolBucket parentBucket { layout, {}, 16.0f, 1.0f, 0, sdfIcons, iconsNeedLinear, sortFeaturesByY, std::move(parentInstances) };
+    parentBucket.bucketInstanceId = ++maxBucketInstanceId;
     index.addBucket(parentID, parentBucket, maxCrossTileID);
 
     // matched child tile
@@ -75,6 +78,7 @@ TEST(CrossTileSymbolLayerIndex, addBucket) {
     grandchildInstances.push_back(makeSymbolInstance(4000, 4000, u"Detroit"));
     grandchildInstances.push_back(makeSymbolInstance(4000, 4000, u"Windsor"));
     SymbolBucket grandchildBucket { layout, {}, 16.0f, 1.0f, 0, sdfIcons, iconsNeedLinear, sortFeaturesByY, std::move(grandchildInstances) };
+    grandchildBucket.bucketInstanceId = ++maxBucketInstanceId;
     index.addBucket(grandchildID, grandchildBucket, maxCrossTileID);
 
     // Matches the symbol in `mainBucket`
@@ -83,3 +87,43 @@ TEST(CrossTileSymbolLayerIndex, addBucket) {
     ASSERT_EQ(grandchildBucket.symbolInstances.at(1).crossTileID, 5u);
 
 }
+
+TEST(CrossTileSymbolLayerIndex, resetIDs) {
+
+    uint32_t maxCrossTileID = 0;
+    uint32_t maxBucketInstanceId = 0;
+    CrossTileSymbolLayerIndex index;
+
+    style::SymbolLayoutProperties::PossiblyEvaluated layout;
+    bool sdfIcons = false;
+    bool iconsNeedLinear = false;
+    bool sortFeaturesByY = false;
+
+    OverscaledTileID mainID(6, 0, 6, 8, 8);
+    std::vector<SymbolInstance> mainInstances;
+    mainInstances.push_back(makeSymbolInstance(1000, 1000, u"Detroit"));
+    SymbolBucket mainBucket { layout, {}, 16.0f, 1.0f, 0, sdfIcons, iconsNeedLinear, sortFeaturesByY, std::move(mainInstances) };
+    mainBucket.bucketInstanceId = ++maxBucketInstanceId;
+
+    OverscaledTileID childID(7, 0, 7, 16, 16);
+    std::vector<SymbolInstance> childInstances;
+    childInstances.push_back(makeSymbolInstance(2000, 2000, u"Detroit"));
+    SymbolBucket childBucket { layout, {}, 16.0f, 1.0f, 0, sdfIcons, iconsNeedLinear, sortFeaturesByY, std::move(childInstances) };
+    childBucket.bucketInstanceId = ++maxBucketInstanceId;
+
+    // assigns a new id
+    index.addBucket(mainID, mainBucket, maxCrossTileID);
+    ASSERT_EQ(mainBucket.symbolInstances.at(0).crossTileID, 1u);
+
+    // removes the tile
+    std::unordered_set<uint32_t> currentIDs;
+    index.removeStaleBuckets(currentIDs);
+
+    // assigns a new id
+    index.addBucket(childID, childBucket, maxCrossTileID);
+    ASSERT_EQ(childBucket.symbolInstances.at(0).crossTileID, 2u);
+
+    // overwrites the old id to match the already-added tile
+    index.addBucket(mainID, mainBucket, maxCrossTileID);
+    ASSERT_EQ(mainBucket.symbolInstances.at(0).crossTileID, 2u);
+}
-- 
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