[core] Make Map.addImage tests pass (#8843)

Fix Node tests suite implementation to parse pixelRatio from style json
Premultiply images in the node binding before sending to mbgl core

2 files changed, 5 insertions, 3 deletions

diff --git a/platform/node/src/node_map.cpp b/platform/node/src/node_map.cpp
index ab49ca6405..1c8bf6d1d2 100644
--- a/platform/node/src/node_map.cpp
+++ b/platform/node/src/node_map.cpp
@@ -12,6 +12,7 @@
 #include <mbgl/style/image.hpp>
 #include <mbgl/map/backend_scope.hpp>
 #include <mbgl/map/query.hpp>
+#include <mbgl/util/premultiply.hpp>
 
 #include <unistd.h>
 
@@ -682,8 +683,9 @@ void NodeMap::AddImage(const Nan::FunctionCallbackInfo<v8::Value>& info) {
 
     std::unique_ptr<uint8_t[]> data = std::make_unique<uint8_t[]>(imageLength);
     std::copy(imageDataBuffer, imageDataBuffer + imageLength, data.get());
-    mbgl::PremultipliedImage cPremultipliedImage({ imageWidth, imageHeight}, std::move(data));
-
+    
+    mbgl::UnassociatedImage cImage({ imageWidth, imageHeight}, std::move(data));
+    mbgl::PremultipliedImage cPremultipliedImage = mbgl::util::premultiply(std::move(cImage));
     nodeMap->map->addImage(*Nan::Utf8String(info[0]), std::make_unique<mbgl::style::Image>(std::move(cPremultipliedImage), pixelRatio));
 }
 
diff --git a/platform/node/test/suite_implementation.js b/platform/node/test/suite_implementation.js
index a5e96f7265..8ac372b7c3 100644
--- a/platform/node/test/suite_implementation.js
+++ b/platform/node/test/suite_implementation.js
@@ -76,7 +76,7 @@ module.exports = function (style, options, callback) {
             map.addImage(operation[1], img.data, {
                 height: img.height,
                 width: img.width,
-                pixelRatio: 1
+                pixelRatio: operation[3] || 1
             });
 
             applyOperations(operations.slice(1), callback);