An extension for Sparrow that takes advantage of GLKView's snapshot method to create UIImages of specific display objects.

SPDisplayObject+Snapshot.h

//
//  SPDisplayObject+Snapshot.h
//  Sparrow 2.X
//
//  Created by Shilo White on 8/20/13.
//
//

#import "SPDisplayObject.h"

@interface SPDisplayObject (Snapshot)

@property (nonatomic, readonly) UIImage *snapshot;
- (UIImage *)snapshotWithStageColor:(uint)stageColor;

@end

SPDisplayObject+Snapshot.m

//
//  SPDisplayObject+Snapshot.m
//  Sparrow 2.X
//
//  Created by Shilo White on 8/20/13.
//
//

#import "SPDisplayObject+Snapshot.h"

@implementation SPDisplayObject (Snapshot)

- (UIImage *)snapshot
{
    UIImage *stageSnapshot = [((GLKView *)Sparrow.currentController.view) snapshot];
    SPRectangle *bounds = [self boundsInSpace:Sparrow.stage];
    CGImageRef imageRef = CGImageCreateWithImageInRect(stageSnapshot.CGImage, CGRectMake(bounds.x, bounds.y, bounds.width, bounds.height));
    UIImage *snapshot = [UIImage imageWithCGImage:imageRef];
    CGImageRelease(imageRef);
    return snapshot;
}

- (UIImage *)snapshotWithStageColor:(uint)stageColor
{
    uint oldStageColor = Sparrow.stage.color;
    Sparrow.stage.color = stageColor;
    UIImage *snapshot = [self snapshot];
    Sparrow.stage.color = oldStageColor;
    return snapshot;
}

@end