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[ASMapNode] Perform MKMapSnapshotter callback off the main thread to eliminate UIImage handling overhead.

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This commit is contained in:
Scott Goodson 2016-02-24 17:02:22 -08:00
parent 306aec9d5b
commit 792db0061b
1 changed files with 37 additions and 31 deletions
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68
AsyncDisplayKit/ASMapNode.mm
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@ -160,37 +160,43 @@
[self setUpSnapshotter];
}
[_snapshotter cancel];
[_snapshotter startWithCompletionHandler:^(MKMapSnapshot *snapshot, NSError *error) {
if (!error) {
UIImage *image = snapshot.image;
CGRect finalImageRect = CGRectMake(0, 0, image.size.width, image.size.height);
UIGraphicsBeginImageContextWithOptions(image.size, YES, image.scale);
[image drawAtPoint:CGPointMake(0, 0)];
if (_annotations.count > 0 ) {
// Get a standard annotation view pin. Future implementations should use a custom annotation image property.
MKAnnotationView *pin = [[MKPinAnnotationView alloc] initWithAnnotation:nil reuseIdentifier:@""];
UIImage *pinImage = pin.image;
for (id<MKAnnotation>annotation in _annotations)
{
CGPoint point = [snapshot pointForCoordinate:annotation.coordinate];
if (CGRectContainsPoint(finalImageRect, point))
{
CGPoint pinCenterOffset = pin.centerOffset;
point.x -= pin.bounds.size.width / 2.0;
point.y -= pin.bounds.size.height / 2.0;
point.x += pinCenterOffset.x;
point.y += pinCenterOffset.y;
[pinImage drawAtPoint:point];
}
}
}
UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
self.image = finalImage;
}
[_snapshotter startWithQueue:dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
completionHandler:^(MKMapSnapshot *snapshot, NSError *error) {
if (!error) {
UIImage *image = snapshot.image;
if (_annotations.count > 0) {
// Only create a graphics context if we have annotations to draw.
// The MKMapSnapshotter is currently not capable of rendering annotations automatically.
CGRect finalImageRect = CGRectMake(0, 0, image.size.width, image.size.height);
UIGraphicsBeginImageContextWithOptions(image.size, YES, image.scale);
[image drawAtPoint:CGPointZero];
// Get a standard annotation view pin. Future implementations should use a custom annotation image property.
MKAnnotationView *pin = [[MKPinAnnotationView alloc] initWithAnnotation:nil reuseIdentifier:@""];
UIImage *pinImage = pin.image;
CGSize pinSize = pin.bounds.size;
for (id<MKAnnotation> annotation in _annotations) {
CGPoint point = [snapshot pointForCoordinate:annotation.coordinate];
if (CGRectContainsPoint(finalImageRect, point)) {
CGPoint pinCenterOffset = pin.centerOffset;
point.x -= pinSize.width / 2.0;
point.y -= pinSize.height / 2.0;
point.x += pinCenterOffset.x;
point.y += pinCenterOffset.y;
[pinImage drawAtPoint:point];
}
}
image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
self.image = image;
}
}];
}