[core, ios, macos] Add image accessor to MGLStyle (#7096)

* [core] Add interface to get image from sprite atlas

* [tests] Add tests for Map::getImage

* [ios, macos] WIP: get MGLImage for name from style

* [ios, macos] Fixed -imageForName:

Convert from sprite images to platform images using the existing encodePNG() function, which is also used for printing. Allow -imageForName: to return nil without an assertion failure. Added a basic test.

4 files changed, 26 insertions, 0 deletions

diff --git a/platform/darwin/test/Media.xcassets/TrackingLocationMask.imageset/Contents.json b/platform/darwin/test/Media.xcassets/TrackingLocationMask.imageset/Contents.json
new file mode 100644
index 0000000000..08cd551fc7
--- /dev/null
+++ b/platform/darwin/test/Media.xcassets/TrackingLocationMask.imageset/Contents.json
@@ -0,0 +1,26 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "TrackingLocationMask.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "TrackingLocationMask@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "TrackingLocationMask@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  },
+  "properties" : {
+    "template-rendering-intent" : "template"
+  }
+}
\ No newline at end of file
diff --git a/platform/darwin/test/Media.xcassets/TrackingLocationMask.imageset/TrackingLocationMask.png b/platform/darwin/test/Media.xcassets/TrackingLocationMask.imageset/TrackingLocationMask.png
new file mode 100644
index 0000000000..bb7348c482
--- /dev/null
+++ b/platform/darwin/test/Media.xcassets/TrackingLocationMask.imageset/TrackingLocationMask.png
diff --git a/platform/darwin/test/Media.xcassets/TrackingLocationMask.imageset/TrackingLocationMask@2x.png b/platform/darwin/test/Media.xcassets/TrackingLocationMask.imageset/TrackingLocationMask@2x.png
new file mode 100644
index 0000000000..35c5a293ec
--- /dev/null
+++ b/platform/darwin/test/Media.xcassets/TrackingLocationMask.imageset/TrackingLocationMask@2x.png
diff --git a/platform/darwin/test/Media.xcassets/TrackingLocationMask.imageset/TrackingLocationMask@3x.png b/platform/darwin/test/Media.xcassets/TrackingLocationMask.imageset/TrackingLocationMask@3x.png
new file mode 100644
index 0000000000..af523975a5
--- /dev/null
+++ b/platform/darwin/test/Media.xcassets/TrackingLocationMask.imageset/TrackingLocationMask@3x.png