[core] ImageManager is not used at tile upload stage

src/mbgl/renderer/image_atlas.cpp

@@ -1,6 +1,4 @@
 #include <mbgl/renderer/image_atlas.hpp>
-#include <mbgl/gfx/upload_pass.hpp>
-#include <mbgl/gfx/context.hpp>
 #include <mbgl/renderer/image_manager.hpp>
 
 #include <mapbox/shelf-pack.hpp>
@@ -53,27 +51,36 @@ const mapbox::Bin& _packImage(mapbox::ShelfPack& pack, const style::Image::Impl&
     return bin;
 }
 
-void ImageAtlas::patchUpdatedImages(gfx::UploadPass& uploadPass, gfx::Texture& atlasTexture, const ImageManager& imageManager) {
+namespace {
+
+void populateImagePatches(
+    ImagePositions& imagePositions, 
+    const ImageManager& imageManager,
+    std::vector<ImagePatch>& /*out*/ patches) {
     for (auto& updatedImageVersion : imageManager.updatedImageVersions) {
-        auto iconPosition = iconPositions.find(updatedImageVersion.first);
-        if (iconPosition != iconPositions.end()) {
-            patchUpdatedImage(uploadPass, atlasTexture, iconPosition->second, imageManager, updatedImageVersion.first, updatedImageVersion.second);
-        }
-        auto patternPosition = patternPositions.find(updatedImageVersion.first);
-        if (patternPosition != patternPositions.end()) {
-            patchUpdatedImage(uploadPass, atlasTexture, patternPosition->second, imageManager, updatedImageVersion.first, updatedImageVersion.second);
+        const std::string& name = updatedImageVersion.first;
+        const uint32_t version = updatedImageVersion.second;
+        auto it = imagePositions.find(updatedImageVersion.first);
+        if (it != imagePositions.end()) {
+            auto& position = it->second;
+            if (position.version == version) continue;
+
+            auto updatedImage = imageManager.getSharedImage(name);
+            if (updatedImage == nullptr) continue;
+
+            patches.emplace_back(*updatedImage, position.textureRect);
+            position.version = version;
         }
     }
 }
 
-void ImageAtlas::patchUpdatedImage(gfx::UploadPass& uploadPass, gfx::Texture& atlasTexture, ImagePosition& position, const ImageManager& imageManager, const std::string& name, uint16_t version) {
-    if (position.version == version) return;
+} // namespace
 
-    auto updatedImage = imageManager.getImage(name);
-    if (updatedImage == nullptr) return;
-
-    uploadPass.updateTextureSub(atlasTexture, updatedImage->image, position.textureRect.x, position.textureRect.y);
-    position.version = version;
+std::vector<ImagePatch> ImageAtlas::getImagePatchesAndUpdateVersions(const ImageManager& imageManager) {
+    std::vector<ImagePatch> imagePatches;
+    populateImagePatches(iconPositions, imageManager, imagePatches);
+    populateImagePatches(patternPositions, imageManager, imagePatches);
+    return imagePatches;
 }
 
 ImageAtlas makeImageAtlas(const ImageMap& icons, const ImageMap& patterns, const std::unordered_map<std::string, uint32_t>& versionMap) {

src/mbgl/renderer/image_atlas.hpp

@@ -54,15 +54,23 @@ public:
 
 using ImagePositions = std::map<std::string, ImagePosition>;
 
+class ImagePatch {
+public:
+    ImagePatch(Immutable<style::Image::Impl> image_,
+               const Rect<uint16_t>& textureRect_)
+        : image(std::move(image_))
+        , textureRect(textureRect_) {}
+    Immutable<style::Image::Impl> image;
+    Rect<uint16_t> textureRect;
+};
+
 class ImageAtlas {
 public:
     PremultipliedImage image;
     ImagePositions iconPositions;
     ImagePositions patternPositions;
 
-    void patchUpdatedImages(gfx::UploadPass&, gfx::Texture&, const ImageManager&);
-private:
-    void patchUpdatedImage(gfx::UploadPass&, gfx::Texture&, ImagePosition& position, const ImageManager& imageManager, const std::string& name, uint16_t version);
+    std::vector<ImagePatch> getImagePatchesAndUpdateVersions(const ImageManager&);
 };
 
 ImageAtlas makeImageAtlas(const ImageMap&, const ImageMap&, const std::unordered_map<std::string, uint32_t>& versionMap);

src/mbgl/renderer/render_orchestrator.cpp

@@ -343,7 +343,7 @@ std::unique_ptr<RenderTree> RenderOrchestrator::createRenderTree(const UpdatePar
     // Update all matrices and generate data that we should upload to the GPU.
     for (const auto& entry : renderSources) {
         if (entry.second->isEnabled()) {
-            entry.second->prepare({renderTreeParameters->transformParams, updateParameters.debugOptions});
+            entry.second->prepare({renderTreeParameters->transformParams, updateParameters.debugOptions, *imageManager});
             sourceRenderItems.emplace_back(*entry.second);
         }
     }

src/mbgl/renderer/render_source.hpp

@@ -28,6 +28,7 @@ class RenderSourceObserver;
 class TileParameters;
 class CollisionIndex;
 class TransformParameters;
+class ImageManager;
 
 namespace gfx {
 class UploadPass;
@@ -37,6 +38,7 @@ class SourcePrepareParameters {
 public:
     const TransformParameters& transform;
     const MapDebugOptions& debugOptions;
+    const ImageManager& imageManager;
 };
 
 class RenderSource : protected TileObserver {

src/mbgl/renderer/render_tile.cpp

@@ -103,6 +103,8 @@ void RenderTile::upload(gfx::UploadPass& uploadPass) {
 void RenderTile::prepare(const SourcePrepareParameters& parameters) {
     renderData = tile.createRenderData();
     assert(renderData);
+    renderData->prepare(parameters);
+
     needsRendering = tile.usedByRenderedLayers;
 
     if (parameters.debugOptions != MapDebugOptions::NoDebug &&

src/mbgl/tile/geometry_tile.cpp

@@ -6,6 +6,7 @@
 #include <mbgl/style/layer_impl.hpp>
 #include <mbgl/style/layers/background_layer.hpp>
 #include <mbgl/style/layers/custom_layer.hpp>
+#include <mbgl/renderer/render_source.hpp>
 #include <mbgl/renderer/tile_parameters.hpp>
 #include <mbgl/renderer/layers/render_background_layer.hpp>
 #include <mbgl/renderer/layers/render_custom_layer.hpp>
@@ -20,6 +21,8 @@
 #include <mbgl/actor/scheduler.hpp>
 #include <mbgl/renderer/tile_render_data.hpp>
 
+#include <mbgl/gfx/upload_pass.hpp>
+
 namespace mbgl {
 
 LayerRenderData* GeometryTile::LayoutResult::getLayerRenderData(const style::Layer::Impl& layerImpl) {
@@ -39,11 +42,9 @@ class GeometryTileRenderData final : public TileRenderData {
 public:
     GeometryTileRenderData(
         std::shared_ptr<GeometryTile::LayoutResult> layoutResult_,
-        std::shared_ptr<TileAtlasTextures> atlasTextures_,
-        ImageManager& imageManager_)
+        std::shared_ptr<TileAtlasTextures> atlasTextures_)
         : TileRenderData(std::move(atlasTextures_))
-        , layoutResult(std::move(layoutResult_))
-        , imageManager(imageManager_) {
+        , layoutResult(std::move(layoutResult_)) {
     }
 
 private:
@@ -52,9 +53,10 @@ private:
     const LayerRenderData* getLayerRenderData(const style::Layer::Impl&) const override;
     Bucket* getBucket(const style::Layer::Impl&) const override;
     void upload(gfx::UploadPass&) override;
+    void prepare(const SourcePrepareParameters&) override;
 
     std::shared_ptr<GeometryTile::LayoutResult> layoutResult;
-    ImageManager& imageManager;
+    std::vector<ImagePatch> imagePatches;
 };
 
 using namespace style;
@@ -95,11 +97,19 @@ void GeometryTileRenderData::upload(gfx::UploadPass& uploadPass) {
         layoutResult->iconAtlas.image = {};
     }
 
-    if (atlasTextures->icon) {
-        layoutResult->iconAtlas.patchUpdatedImages(uploadPass, *atlasTextures->icon, imageManager);
+    if (atlasTextures->icon && !imagePatches.empty()) {
+        for (const auto& imagePatch : imagePatches) { // patch updated images.
+            uploadPass.updateTextureSub(*atlasTextures->icon, imagePatch.image->image, imagePatch.textureRect.x, imagePatch.textureRect.y);
+        }
+        imagePatches.clear();
     }
 }
 
+void GeometryTileRenderData::prepare(const SourcePrepareParameters& parameters) {
+    if (!layoutResult) return;
+    imagePatches = layoutResult->iconAtlas.getImagePatchesAndUpdateVersions(parameters.imageManager);
+}
+
 Bucket* GeometryTileRenderData::getBucket(const Layer::Impl& layer) const {
     const LayerRenderData* data = getLayerRenderData(layer);
     return data ? data->bucket.get() : nullptr; 
@@ -176,7 +186,7 @@ void GeometryTile::setData(std::unique_ptr<const GeometryTileData> data_) {
 }
 
 std::unique_ptr<TileRenderData> GeometryTile::createRenderData() {
-    return std::make_unique<GeometryTileRenderData>(layoutResult, atlasTextures, imageManager);
+    return std::make_unique<GeometryTileRenderData>(layoutResult, atlasTextures);
 }
 
 void GeometryTile::setLayers(const std::vector<Immutable<LayerProperties>>& layers) {