1 files changed, 62 insertions, 0 deletions
diff --git a/platform/darwin/src/MGLTilePyramidDownloadRegion.mm b/platform/darwin/src/MGLTilePyramidDownloadRegion.mm
new file mode 100644
index 0000000000..942450c0c2
--- /dev/null
+++ b/platform/darwin/src/MGLTilePyramidDownloadRegion.mm
@@ -0,0 +1,62 @@
+#import "MGLTilePyramidDownloadRegion.h"
+
+#import "MGLDownloadRegion_Private.h"
+#import "MGLGeometry_Private.h"
+#import "MGLStyle.h"
+
+@interface MGLTilePyramidDownloadRegion () <MGLDownloadRegion_Private>
+
+@end
+
+@implementation MGLTilePyramidDownloadRegion {
+    NSURL *_styleURL;
+}
+
+@synthesize styleURL = _styleURL;
+
+- (instancetype)init {
+    [NSException raise:@"Method unavailable"
+                format:
+     @"-[MGLTilePyramidDownloadRegion init] is unavailable. "
+     @"Use -initWithStyleURL:bounds:fromZoomLevel:toZoomLevel: instead."];
+    return nil;
+}
+
+- (instancetype)initWithStyleURL:(NSURL *)styleURL bounds:(MGLCoordinateBounds)bounds fromZoomLevel:(double)minimumZoomLevel toZoomLevel:(double)maximumZoomLevel {
+    if (self = [super init]) {
+        if (!styleURL) {
+            styleURL = [MGLStyle streetsStyleURL];
+        }
+        
+        if (!styleURL.scheme) {
+            // Assume a relative path into the application bundle.
+            styleURL = [NSURL URLWithString:[@"asset://" stringByAppendingString:styleURL.absoluteString]];
+        }
+        
+        _styleURL = styleURL;
+        _bounds = bounds;
+        _minimumZoomLevel = minimumZoomLevel;
+        _maximumZoomLevel = maximumZoomLevel;
+    }
+    return self;
+}
+
+- (instancetype)initWithOfflineRegionDefinition:(const mbgl::OfflineRegionDefinition &)definition {
+    NSURL *styleURL = [NSURL URLWithString:@(definition.styleURL.c_str())];
+    MGLCoordinateBounds bounds = MGLCoordinateBoundsFromLatLngBounds(definition.bounds);
+    return [self initWithStyleURL:styleURL bounds:bounds fromZoomLevel:definition.minZoom toZoomLevel:definition.maxZoom];
+}
+
+- (const mbgl::OfflineRegionDefinition)offlineRegionDefinition {
+#if TARGET_OS_IPHONE || TARGET_OS_SIMULATOR
+    const float scaleFactor = [UIScreen instancesRespondToSelector:@selector(nativeScale)] ? [[UIScreen mainScreen] nativeScale] : [[UIScreen mainScreen] scale];
+#elif TARGET_OS_MAC
+    const float scaleFactor = [NSScreen mainScreen].backingScaleFactor;
+#endif
+    return mbgl::OfflineTilePyramidRegionDefinition(_styleURL.absoluteString.UTF8String,
+                                                    MGLLatLngBoundsFromCoordinateBounds(_bounds),
+                                                    _minimumZoomLevel, _maximumZoomLevel,
+                                                    scaleFactor);
+}
+
+@end