[ios, macos] Hook up hillshade style layers, raster DEM sources to iOS/macOS (#11036)

* [ios, macos] Finished implementing MGLHillshadeStyleLayer

* [macos] Added icon for hillshade layer

Also set the background layer icon to mirror in right-to-left locales.

* [ios, macos] Implemented raster DEM source

* [macos] Added Enhance Terrain debugging command

* [ios, macos] Simplified raster DEM source example

1 files changed, 8 insertions, 3 deletions

diff --git a/platform/darwin/src/MGLRasterSource.mm b/platform/darwin/src/MGLRasterSource.mm
index 8fc18ba69d..c47cc199eb 100644
--- a/platform/darwin/src/MGLRasterSource.mm
+++ b/platform/darwin/src/MGLRasterSource.mm
@@ -33,12 +33,17 @@ static const CGFloat MGLRasterSourceRetinaTileSize = 512;
 }
 
 - (instancetype)initWithIdentifier:(NSString *)identifier configurationURL:(NSURL *)configurationURL tileSize:(CGFloat)tileSize {
-    auto source = std::make_unique<mbgl::style::RasterSource>(identifier.UTF8String,
-                                                              configurationURL.mgl_URLByStandardizingScheme.absoluteString.UTF8String,
-                                                              uint16_t(round(tileSize)));
+    auto source = [self pendingSourceWithIdentifier:identifier configurationURL:configurationURL tileSize:tileSize];
     return self = [super initWithPendingSource:std::move(source)];
 }
 
+- (std::unique_ptr<mbgl::style::RasterSource>)pendingSourceWithIdentifier:(NSString *)identifier configurationURL:(NSURL *)configurationURL tileSize:(CGFloat)tileSize {
+    NSString *configurationURLString = configurationURL.mgl_URLByStandardizingScheme.absoluteString;
+    return std::make_unique<mbgl::style::RasterSource>(identifier.UTF8String,
+                                                       configurationURLString.UTF8String,
+                                                       uint16_t(round(tileSize)));
+}
+
 - (instancetype)initWithIdentifier:(NSString *)identifier tileURLTemplates:(NS_ARRAY_OF(NSString *) *)tileURLTemplates options:(nullable NS_DICTIONARY_OF(MGLTileSourceOption, id) *)options {
     mbgl::Tileset tileSet = MGLTileSetFromTileURLTemplates(tileURLTemplates, options);