move sprite to a use future loading

14 files changed, 141 insertions, 143 deletions

diff --git a/include/mbgl/geometry/sprite_atlas.hpp b/include/mbgl/geometry/sprite_atlas.hpp
index 4b55540cc8..dc2378c2fb 100644
--- a/include/mbgl/geometry/sprite_atlas.hpp
+++ b/include/mbgl/geometry/sprite_atlas.hpp
@@ -26,18 +26,21 @@ public:
     // Changes the pixel ratio.
     bool resize(float newRatio);
 
-    // Update uninitialized sprites in this atlas from the given sprite.
+    // Update uninitialized (= outdated) sprites in this atlas from the given sprite.
     void update(const Sprite &sprite);
 
-    // Returns the coordinates of a square icon. The getter also *creates* new square icons in the
-    // atlas if they don't exist, but they'll be default-initialized with a a black circle.
-    Rect<dimension> getIcon(int size, const std::string &name);
-
     // Returns the coordinates of an image that is sourced from the sprite image.
-    // This getter does not create images, as the dimension of the texture us unknown if the
-    // sprite is not yet loaded. Instead, it returns a 0/0/0/0 rect.
+    // This getter attempts to read the image from the sprite if it is already loaded.
+    // In that case, it copies it into the sprite atlas and returns the dimensions.
+    // Otherwise, it returns a 0/0/0/0 rect.
     Rect<dimension> getImage(const std::string &name, const Sprite &sprite);
 
+    // Returns the coordinates of an image that is sourced from the sprite image.
+    // This getter waits until the sprite image was loaded, copies it into the sprite
+    // image and returns the dimensions.
+    // NEVER CALL THIS FUNCTION FROM THE RENDER THREAD! it is blocking.
+    Rect<dimension> waitForImage(const std::string &name, const Sprite &sprite);
+
     // Binds the image buffer of this sprite atlas to the GPU, and uploads data if it is out
     // of date.
     void bind(bool linear = false);
diff --git a/include/mbgl/map/map.hpp b/include/mbgl/map/map.hpp
index 81d55b217f..0a94fc7ed2 100644
--- a/include/mbgl/map/map.hpp
+++ b/include/mbgl/map/map.hpp
@@ -21,6 +21,7 @@ class GlyphAtlas;
 class GlyphStore;
 class LayerDescription;
 class SpriteAtlas;
+class Sprite;
 class Style;
 class StyleLayer;
 class StyleLayerGroup;
@@ -110,10 +111,11 @@ public:
 
 public:
     inline const TransformState &getState() const { return state; }
-    inline std::shared_ptr<const Style> getStyle() const { return style; }
+    inline std::shared_ptr<Style> getStyle() const { return style; }
     inline std::shared_ptr<GlyphAtlas> getGlyphAtlas() { return glyphAtlas; }
     inline std::shared_ptr<GlyphStore> getGlyphStore() { return glyphStore; }
     inline std::shared_ptr<SpriteAtlas> getSpriteAtlas() { return spriteAtlas; }
+    std::shared_ptr<Sprite> getSprite();
     inline std::shared_ptr<Texturepool> getTexturepool() { return texturepool; }
     inline std::shared_ptr<uv::loop> getLoop() { return loop; }
     inline timestamp getAnimationTime() const { return animationTime; }
@@ -172,6 +174,7 @@ private:
     std::shared_ptr<GlyphAtlas> glyphAtlas;
     std::shared_ptr<GlyphStore> glyphStore;
     std::shared_ptr<SpriteAtlas> spriteAtlas;
+    std::shared_ptr<Sprite> sprite;
     std::shared_ptr<Texturepool> texturepool;
 
     Painter painter;
diff --git a/include/mbgl/map/sprite.hpp b/include/mbgl/map/sprite.hpp
index 3f8d5611a4..40d37d5da1 100644
--- a/include/mbgl/map/sprite.hpp
+++ b/include/mbgl/map/sprite.hpp
@@ -2,6 +2,7 @@
 #define MBGL_STYLE_SPRITE
 
 #include <mbgl/util/image.hpp>
+#include <mbgl/util/noncopyable.hpp>
 
 #include <cstdint>
 #include <atomic>
@@ -9,6 +10,7 @@
 #include <memory>
 #include <string>
 #include <unordered_map>
+#include <future>
 
 namespace mbgl {
 
@@ -28,37 +30,43 @@ public:
     uint8_t pixelRatio = 1;
 };
 
-class Sprite : public std::enable_shared_from_this<Sprite> {
-public:
-    Sprite(Map &map, float pixelRatio = 1);
+class Sprite : public std::enable_shared_from_this<Sprite>, private util::noncopyable {
+private:
+    struct Key {};
+    void load();
 
-    void load(const std::string& base_url);
+public:
+    Sprite(const Key &, const std::string& base_url, float pixelRatio);
+    static std::shared_ptr<Sprite> Create(const std::string& base_url, float pixelRatio);
 
     const SpritePosition &getSpritePosition(const std::string& name) const;
 
+    void waitUntilLoaded() const;
     bool isLoaded() const;
 
+    operator bool() const;
+
 public:
     const float pixelRatio;
+    const std::string url;
     std::unique_ptr<util::Image> raster;
 
 private:
-    void asyncParseJSON();
-    void asyncParseImage();
-
-    static void parseJSON(std::shared_ptr<Sprite> &sprite);
-    static void parseImage(std::shared_ptr<Sprite> &sprite);
-    static void complete(std::shared_ptr<Sprite> &sprite);
+    void parseJSON();
+    void parseImage();
+    void complete();
 
 private:
-    Map &map;
-    std::string url;
     std::string body;
     std::string image;
     std::atomic<bool> loadedImage;
     std::atomic<bool> loadedJSON;
     std::unordered_map<std::string, SpritePosition> pos;
     const SpritePosition empty;
+
+    std::promise<void> promise;
+    std::future<void> future;
+
 };
 
 }
diff --git a/include/mbgl/map/tile_parser.hpp b/include/mbgl/map/tile_parser.hpp
index 84505c1e05..b407502434 100644
--- a/include/mbgl/map/tile_parser.hpp
+++ b/include/mbgl/map/tile_parser.hpp
@@ -18,6 +18,7 @@ class FontStack;
 class GlyphAtlas;
 class GlyphStore;
 class SpriteAtlas;
+class Sprite;
 class Style;
 class StyleBucket;
 class StyleBucketFill;
@@ -32,7 +33,8 @@ public:
                const std::shared_ptr<const Style> &style,
                const std::shared_ptr<GlyphAtlas> &glyphAtlas,
                const std::shared_ptr<GlyphStore> &glyphStore,
-               const std::shared_ptr<SpriteAtlas> &spriteAtlas);
+               const std::shared_ptr<SpriteAtlas> &spriteAtlas,
+               const std::shared_ptr<Sprite> &sprite);
 
 public:
     void parse();
@@ -57,6 +59,7 @@ private:
     std::shared_ptr<GlyphAtlas> glyphAtlas;
     std::shared_ptr<GlyphStore> glyphStore;
     std::shared_ptr<SpriteAtlas> spriteAtlas;
+    std::shared_ptr<Sprite> sprite;
 
     Placement placement;
 };
diff --git a/include/mbgl/renderer/symbol_bucket.hpp b/include/mbgl/renderer/symbol_bucket.hpp
index a073856d2b..b1917a93b2 100644
--- a/include/mbgl/renderer/symbol_bucket.hpp
+++ b/include/mbgl/renderer/symbol_bucket.hpp
@@ -24,6 +24,7 @@ class IconShader;
 class DotShader;
 class Placement;
 class SpriteAtlas;
+class Sprite;
 class GlyphAtlas;
 class GlyphStore;
 class FontStack;
@@ -44,8 +45,8 @@ public:
     virtual bool hasIconData() const;
 
     void addFeatures(const VectorTileLayer &layer, const FilterExpression &filter,
-                     const Tile::ID &id, SpriteAtlas &spriteAtlas, GlyphAtlas &glyphAtlas,
-                     GlyphStore &glyphStore);
+                     const Tile::ID &id, SpriteAtlas &spriteAtlas, Sprite &sprite,
+                     GlyphAtlas &glyphAtlas, GlyphStore &glyphStore);
 
     void addGlyphs(const PlacedGlyphs &glyphs, float placementZoom, PlacementRange placementRange,
                    float zoom);
diff --git a/include/mbgl/style/style.hpp b/include/mbgl/style/style.hpp
index 6aab71a4c6..3df58ab42b 100644
--- a/include/mbgl/style/style.hpp
+++ b/include/mbgl/style/style.hpp
@@ -48,13 +48,15 @@ public:
 
     const BackgroundProperties &getBackgroundProperties() const;
 
+    const std::string &getSpriteURL() const;
+
 public:
-    std::shared_ptr<Sprite> sprite;
     std::shared_ptr<StyleLayerGroup> layers;
     std::vector<std::string> appliedClasses;
-    std::string sprite_url;
     std::string glyph_url;
 
+private:
+    std::string sprite_url;
 
 private:
     PropertyTransition defaultTransition;
diff --git a/src/geometry/sprite_atlas.cpp b/src/geometry/sprite_atlas.cpp
index 8fa3e83888..71d3cbee99 100644
--- a/src/geometry/sprite_atlas.cpp
+++ b/src/geometry/sprite_atlas.cpp
@@ -88,27 +88,6 @@ void copy_bitmap(const uint32_t *src, const int src_stride, const int src_x, con
     }
 }
 
-void draw_circle(uint32_t *dst, const int dst_stride, const int dst_x, const int dst_y,
-                const int width, const int height, const float blur,
-                const uint8_t r = 0xFF, const uint8_t g = 0xFF, const uint8_t b = 0xFF) {
-    const int sprite_stride = dst_stride;
-    const int radius = util::min(width, height);
-    for (int y = 0; y < height; y++) {
-        const int img_y = (dst_y + y) * sprite_stride + dst_x;
-        for (int x = 0; x < height; x++) {
-            const float dist = util::length(float(x) / radius - 0.5f, float(y) / radius - 0.5f);
-            const float t = util::smoothstep(0.5f, 0.5f - blur, dist);
-            const uint8_t alpha = t * 255;
-
-            uint32_t color = (uint32_t(r * t) << 0) |
-                             (uint32_t(g * t) << 8) |
-                             (uint32_t(b * t) << 16) |
-                             (uint32_t(alpha) << 24);
-            dst[img_y + x] = color;
-        }
-    }
-}
-
 Rect<SpriteAtlas::dimension> SpriteAtlas::allocateImage(size_t width, size_t height) {
     // We have to allocate a new area in the bin, and store an empty image in it.
     // Add a 1px border around every image.
@@ -125,44 +104,6 @@ Rect<SpriteAtlas::dimension> SpriteAtlas::allocateImage(size_t width, size_t hei
     return rect;
 }
 
-Rect<SpriteAtlas::dimension> SpriteAtlas::getIcon(const int size, const std::string &name) {
-    std::lock_guard<std::mutex> lock(mtx);
-
-    auto rect_it = images.find(name);
-    if (rect_it != images.end()) {
-        return rect_it->second;
-    }
-
-    Rect<dimension> rect = allocateImage(size, size);
-    if (rect.w == 0) {
-        if (debug::spriteWarnings) {
-            fprintf(stderr, "[WARNING] sprite atlas bitmap overflow\n");
-        }
-        return rect;
-    }
-
-    images.emplace(name, rect);
-
-    allocate();
-
-    // Draw an antialiased circle.
-    draw_circle(
-        reinterpret_cast<uint32_t *>(data),
-        width * pixelRatio,
-        rect.x * pixelRatio,
-        rect.y * pixelRatio,
-        size * pixelRatio,
-        size * pixelRatio,
-        1.0f / size / pixelRatio
-    );
-
-    uninitialized.emplace(name);
-
-    dirty = true;
-
-    return rect;
-}
-
 Rect<SpriteAtlas::dimension> SpriteAtlas::getImage(const std::string &name, const Sprite &sprite) {
     std::lock_guard<std::mutex> lock(mtx);
 
@@ -191,6 +132,12 @@ Rect<SpriteAtlas::dimension> SpriteAtlas::getImage(const std::string &name, cons
     return rect;
 }
 
+
+Rect<SpriteAtlas::dimension> SpriteAtlas::waitForImage(const std::string &name, const Sprite &sprite) {
+    sprite.waitUntilLoaded();
+    return getImage(name, sprite);
+}
+
 void SpriteAtlas::allocate() {
     if (!data) {
         dimension w = static_cast<dimension>(width * pixelRatio);
diff --git a/src/map/map.cpp b/src/map/map.cpp
index ca43662e09..269d174c8c 100644
--- a/src/map/map.cpp
+++ b/src/map/map.cpp
@@ -201,6 +201,17 @@ std::string Map::getAccessToken() const {
     return accessToken;
 }
 
+std::shared_ptr<Sprite> Map::getSprite() {
+    float pixelRatio = state.getPixelRatio();
+    const std::string &sprite_url = style->getSpriteURL();
+    if (!sprite || sprite->pixelRatio != pixelRatio || sprite->url != sprite_url) {
+        sprite = Sprite::Create(sprite_url, pixelRatio);
+    }
+
+    return sprite;
+}
+
+
 #pragma mark - Size
 
 // Note: This function is called from another thread. Make sure you only call threadsafe functions!
@@ -502,14 +513,6 @@ void Map::prepare() {
     bool dimensionsChanged = oldState.getFramebufferWidth() != state.getFramebufferWidth() ||
                              oldState.getFramebufferHeight() != state.getFramebufferHeight();
 
-    if (pixelRatioChanged) {
-        style->sprite = std::make_shared<Sprite>(*this, state.getPixelRatio());
-        if (style->sprite_url.size()) {
-            style->sprite->load(style->sprite_url);
-        }
-        spriteAtlas->resize(state.getPixelRatio());
-    }
-
     // Create a new glyph store object in case the glyph URL changed.
     // TODO: Move this to a less frequently called place; we only need to do this when the
     // stylesheet changes.
@@ -528,11 +531,13 @@ void Map::prepare() {
     updateSources();
     style->updateProperties(state.getNormalizedZoom(), animationTime);
 
-    // Allow the sprite atlas to potentially pull new sprite images if needed.
-    if (style->sprite && style->sprite->isLoaded()) {
-        spriteAtlas->update(*style->sprite);
+    if (pixelRatioChanged) {
+        spriteAtlas->resize(state.getPixelRatio());
     }
 
+    // Allow the sprite atlas to potentially pull new sprite images if needed.
+    spriteAtlas->update(*getSprite());
+
     updateTiles();
 }
 
diff --git a/src/map/sprite.cpp b/src/map/sprite.cpp
index 60f19ab006..6cf40f23f9 100644
--- a/src/map/sprite.cpp
+++ b/src/map/sprite.cpp
@@ -20,48 +20,75 @@ SpritePosition::SpritePosition(uint16_t x, uint16_t y, uint16_t width, uint16_t
       pixelRatio(pixelRatio) {
 }
 
-Sprite::Sprite(Map &map, float pixelRatio)
+std::shared_ptr<Sprite> Sprite::Create(const std::string& base_url, float pixelRatio) {
+    std::shared_ptr<Sprite> sprite(std::make_shared<Sprite>(Key(), base_url, pixelRatio));
+    sprite->load();
+    return sprite;
+}
+
+Sprite::Sprite(const Key &, const std::string& base_url, float pixelRatio)
     : pixelRatio(pixelRatio),
+      url(base_url),
       raster(),
-      map(map),
       loadedImage(false),
-      loadedJSON(false) {
+      loadedJSON(false),
+      future(promise.get_future()) {
+}
+
+void Sprite::waitUntilLoaded() const {
+    future.wait();
 }
 
-void Sprite::load(const std::string& base_url) {
-    loadedImage = false;
-    loadedJSON = false;
+Sprite::operator bool() const {
+    return isLoaded() && !pos.empty();
+}
+
+
+// Note: This is a separate function that must be called exactly once after creation
+// The reason this isn't part of the constructor is that calling shared_from_this() in
+// the constructor fails.
+void Sprite::load() {
+    if (url.length() == 0) {
+        // Treat a non-existent sprite as an empty sprite.
+        loadedImage = true;
+        loadedJSON = true;
+        promise.set_value();
+        return;
+    }
 
-    url = base_url;
     std::shared_ptr<Sprite> sprite = shared_from_this();
 
-    std::string suffix = (pixelRatio > 1 ? "@2x" : "");
+    const std::string suffix = (pixelRatio > 1 ? "@2x" : "");
 
-    platform::request_http(base_url + suffix + ".json", [sprite](platform::Response *res) {
+    platform::request_http(url + suffix + ".json", [sprite](platform::Response *res) {
         if (res->code == 200) {
             sprite->body.swap(res->body);
-            sprite->asyncParseJSON();
+            sprite->parseJSON();
+            sprite->complete();
         } else {
             fprintf(stderr, "failed to load sprite info\n");
             fprintf(stderr, "error %d: %s\n", res->code, res->error_message.c_str());
+            sprite->promise.set_exception(std::make_exception_ptr(std::runtime_error(res->error_message)));
         }
-    }, map.getLoop());
+    });
 
-    platform::request_http(base_url + suffix + ".png", [sprite](platform::Response *res) {
+    platform::request_http(url + suffix + ".png", [sprite](platform::Response *res) {
         if (res->code == 200) {
-             sprite->image.swap(res->body);
-             sprite->asyncParseImage();
+            sprite->image.swap(res->body);
+            sprite->parseImage();
+            sprite->complete();
         } else {
             fprintf(stderr, "failed to load sprite image\n");
             fprintf(stderr, "error %d: %s\n", res->code, res->error_message.c_str());
+            sprite->promise.set_exception(std::make_exception_ptr(std::runtime_error(res->error_message)));
         }
-    }, map.getLoop());
+    });
 }
 
-void Sprite::complete(std::shared_ptr<Sprite> &sprite) {
-    if (sprite->loadedImage && sprite->loadedJSON) {
-        sprite->map.update();
-        Log::Info(Event::Sprite, "loaded %s", sprite->url.c_str());
+void Sprite::complete() {
+    if (loadedImage && loadedJSON) {
+        Log::Info(Event::Sprite, "loaded %s", url.c_str());
+        promise.set_value();
     }
 }
 
@@ -69,28 +96,20 @@ bool Sprite::isLoaded() const {
     return loadedImage && loadedJSON;
 }
 
-void Sprite::asyncParseImage() {
-    new uv::work<std::shared_ptr<Sprite>>(map.getLoop(), parseImage, complete, shared_from_this());
+void Sprite::parseImage() {
+    raster = std::make_unique<util::Image>(image);
+    image.clear();
+    loadedImage = true;
 }
 
-void Sprite::asyncParseJSON() {
-    new uv::work<std::shared_ptr<Sprite>>(map.getLoop(), parseJSON, complete, shared_from_this());
-}
-
-void Sprite::parseImage(std::shared_ptr<Sprite> &sprite) {
-    sprite->raster = std::make_unique<util::Image>(sprite->image);
-    sprite->image.clear();
-    sprite->loadedImage = true;
-}
-
-void Sprite::parseJSON(std::shared_ptr<Sprite> &sprite) {
+void Sprite::parseJSON() {
     rapidjson::Document d;
-    d.Parse<0>(sprite->body.c_str());
-    sprite->body.clear();
-
-    if (d.IsObject()) {
-        std::unordered_map<std::string, SpritePosition> pos;
+    d.Parse<0>(body.c_str());
+    body.clear();
 
+    if (d.HasParseError()) {
+        Log::Warning(Event::Sprite, "sprite JSON is invalid");
+    } else if (d.IsObject()) {
         for (rapidjson::Value::ConstMemberIterator itr = d.MemberBegin(); itr != d.MemberEnd(); ++itr) {
             const std::string& name = itr->name.GetString();
             const rapidjson::Value& value = itr->value;
@@ -110,10 +129,11 @@ void Sprite::parseJSON(std::shared_ptr<Sprite> &sprite) {
                 pos.emplace(name, SpritePosition { x, y, width, height, pixelRatio });
             }
         }
-
-        sprite->pos.swap(pos);
-        sprite->loadedJSON = true;
+    } else {
+        Log::Warning(Event::Sprite, "sprite JSON root is not an object");
     }
+
+    loadedJSON = true;
 }
 
 const SpritePosition &Sprite::getSpritePosition(const std::string& name) const {
diff --git a/src/map/tile_parser.cpp b/src/map/tile_parser.cpp
index 6be9bcb32c..99ee676237 100644
--- a/src/map/tile_parser.cpp
+++ b/src/map/tile_parser.cpp
@@ -34,13 +34,15 @@ TileParser::TileParser(const std::string &data, VectorTileData &tile,
                        const std::shared_ptr<const Style> &style,
                        const std::shared_ptr<GlyphAtlas> &glyphAtlas,
                        const std::shared_ptr<GlyphStore> &glyphStore,
-                       const std::shared_ptr<SpriteAtlas> &spriteAtlas)
+                       const std::shared_ptr<SpriteAtlas> &spriteAtlas,
+                       const std::shared_ptr<Sprite> &sprite)
     : vector_data(pbf((const uint8_t *)data.data(), data.size())),
       tile(tile),
       style(style),
       glyphAtlas(glyphAtlas),
       glyphStore(glyphStore),
       spriteAtlas(spriteAtlas),
+      sprite(sprite),
       placement(tile.id.z, tile.id.z >= tile.source.max_zoom ? tile.source.max_zoom - tile.id.z : 1) {
 }
 
@@ -153,6 +155,6 @@ std::unique_ptr<Bucket> TileParser::createLineBucket(const VectorTileLayer& laye
 
 std::unique_ptr<Bucket> TileParser::createSymbolBucket(const VectorTileLayer& layer, const FilterExpression &filter, const StyleBucketSymbol &symbol) {
     std::unique_ptr<SymbolBucket> bucket = std::make_unique<SymbolBucket>(tile.textVertexBuffer, tile.iconVertexBuffer, tile.triangleElementsBuffer, symbol, placement);
-    bucket->addFeatures(layer, filter, tile.id, *spriteAtlas, *glyphAtlas, *glyphStore);
+    bucket->addFeatures(layer, filter, tile.id, *spriteAtlas, *sprite, *glyphAtlas, *glyphStore);
     return obsolete() ? nullptr : std::move(bucket);
 }
diff --git a/src/map/vector_tile_data.cpp b/src/map/vector_tile_data.cpp
index fd3cd6ec8c..99c521b8ab 100644
--- a/src/map/vector_tile_data.cpp
+++ b/src/map/vector_tile_data.cpp
@@ -20,7 +20,7 @@ VectorTileData::~VectorTileData() {
 }
 
 void VectorTileData::beforeParse() {
-    parser = std::make_unique<TileParser>(data, *this, map.getStyle(), map.getGlyphAtlas(), map.getGlyphStore(), map.getSpriteAtlas());
+    parser = std::make_unique<TileParser>(data, *this, map.getStyle(), map.getGlyphAtlas(), map.getGlyphStore(), map.getSpriteAtlas(), map.getSprite());
 }
 
 void VectorTileData::parse() {
diff --git a/src/renderer/painter_fill.cpp b/src/renderer/painter_fill.cpp
index 7664555b7a..29d77e05d9 100644
--- a/src/renderer/painter_fill.cpp
+++ b/src/renderer/painter_fill.cpp
@@ -71,10 +71,10 @@ void Painter::renderFill(FillBucket& bucket, const FillProperties& properties, c
     }
 
     if ((fill_color[3] >= 1.0f) == (pass == Opaque)) {
-        const std::shared_ptr<Sprite> &sprite = map.getStyle()->sprite;
+        Sprite &sprite = *map.getSprite();
         if (properties.image.size() && sprite) {
             SpriteAtlas &spriteAtlas = *map.getSpriteAtlas();
-            Rect<uint16_t> imagePos = spriteAtlas.getImage(properties.image, *sprite);
+            Rect<uint16_t> imagePos = spriteAtlas.getImage(properties.image, sprite);
 
 
             float factor = 8.0 / std::pow(2, map.getState().getIntegerZoom() - id.z);
diff --git a/src/renderer/symbol_bucket.cpp b/src/renderer/symbol_bucket.cpp
index 60fd6e240a..f09f87da0a 100644
--- a/src/renderer/symbol_bucket.cpp
+++ b/src/renderer/symbol_bucket.cpp
@@ -62,7 +62,7 @@ void SymbolBucket::addGlyph(uint64_t tileid, const std::string stackname,
 }
 
 void SymbolBucket::addFeatures(const VectorTileLayer &layer, const FilterExpression &filter,
-                               const Tile::ID &id, SpriteAtlas &spriteAtlas, GlyphAtlas &glyphAtlas,
+                               const Tile::ID &id, SpriteAtlas &spriteAtlas, Sprite &sprite, GlyphAtlas &glyphAtlas,
                                GlyphStore &glyphStore) {
     const bool text = properties.text.field.size();
     const bool icon = properties.icon.image.size();
@@ -106,8 +106,7 @@ void SymbolBucket::addFeatures(const VectorTileLayer &layer, const FilterExpress
             if (icon) {
                 std::string field = util::replaceTokens(properties.icon.image, feature.properties);
 
-                // TODO: remove hardcoded size 12.
-                const Rect<uint16_t> rect = spriteAtlas.getIcon(12, field);
+                const Rect<uint16_t> rect = spriteAtlas.waitForImage(field, sprite);
                 const uint16_t tx = rect.x + rect.w / 2;
                 const uint16_t ty = rect.y + rect.h / 2;
 
diff --git a/src/style/style.cpp b/src/style/style.cpp
index f867616970..76ee3707bc 100644
--- a/src/style/style.cpp
+++ b/src/style/style.cpp
@@ -1,4 +1,5 @@
 #include <mbgl/style/style.hpp>
+#include <mbgl/map/sprite.hpp>
 #include <mbgl/style/style_layer_group.hpp>
 #include <mbgl/style/style_parser.hpp>
 #include <mbgl/style/style_bucket.hpp>
@@ -29,6 +30,10 @@ void Style::updateProperties(float z, timestamp now) {
     }
 }
 
+const std::string &Style::getSpriteURL() const {
+    return sprite_url;
+}
+
 void Style::setDefaultTransitionDuration(uint16_t duration_milliseconds) {
     defaultTransition.duration = duration_milliseconds;
 }