diff options
Diffstat (limited to 'platform/darwin/src/MGLMapSnapshotter.mm')
| -rw-r--r-- | platform/darwin/src/MGLMapSnapshotter.mm | 105 |
1 files changed, 88 insertions, 17 deletions
diff --git a/platform/darwin/src/MGLMapSnapshotter.mm b/platform/darwin/src/MGLMapSnapshotter.mm index 0001ebcb86..3a258d146a 100644 --- a/platform/darwin/src/MGLMapSnapshotter.mm +++ b/platform/darwin/src/MGLMapSnapshotter.mm @@ -32,6 +32,26 @@ const CGPoint MGLLogoImagePosition = CGPointMake(8, 8); const CGFloat MGLSnapshotterMinimumPixelSize = 64; + +@interface MGLMapSnapshotOverlay() + +- (instancetype)initWithContext:(CGContextRef)context; + +@end + +@implementation MGLMapSnapshotOverlay + +- (instancetype) initWithContext:(CGContextRef)context { + self = [super init]; + if (self) { + _context = context; + } + + return self; +} + +@end + @implementation MGLMapSnapshotOptions - (instancetype _Nonnull)initWithStyleURL:(nullable NSURL *)styleURL camera:(MGLMapCamera *)camera size:(CGSize)size @@ -183,7 +203,15 @@ const CGFloat MGLSnapshotterMinimumPixelSize = 64; [self startWithQueue:dispatch_get_main_queue() completionHandler:completion]; } -- (void)startWithQueue:(dispatch_queue_t)queue completionHandler:(MGLMapSnapshotCompletionHandler)completion +- (void)startWithQueue:(dispatch_queue_t)queue completionHandler:(MGLMapSnapshotCompletionHandler)completionHandler { + [self startWithQueue:queue overlayHandler:nil completionHandler:completionHandler]; +} + +- (void)startWithOverlayHandler:(MGLMapSnapshotOverlayHandler)overlayHandler completionHandler:(MGLMapSnapshotCompletionHandler)completion { + [self startWithQueue:dispatch_get_main_queue() overlayHandler:overlayHandler completionHandler:completion]; +} + +- (void)startWithQueue:(dispatch_queue_t)queue overlayHandler:(MGLMapSnapshotOverlayHandler)overlayHandler completionHandler:(MGLMapSnapshotCompletionHandler)completion { if (!mbgl::Scheduler::GetCurrent()) { [NSException raise:NSInvalidArgumentException @@ -210,8 +238,8 @@ const CGFloat MGLSnapshotterMinimumPixelSize = 64; // capture weakSelf to avoid retain cycle if callback is never called (ie snapshot cancelled) _snapshotCallback = std::make_unique<mbgl::Actor<mbgl::MapSnapshotter::Callback>>( - *mbgl::Scheduler::GetCurrent(), - [=](std::exception_ptr mbglError, mbgl::PremultipliedImage image, mbgl::MapSnapshotter::Attributions attributions, mbgl::MapSnapshotter::PointForFn pointForFn, mbgl::MapSnapshotter::LatLngForFn latLngForFn) { + *mbgl::Scheduler::GetCurrent(), + [=](std::exception_ptr mbglError, mbgl::PremultipliedImage image, mbgl::MapSnapshotter::Attributions attributions, mbgl::MapSnapshotter::PointForFn pointForFn, mbgl::MapSnapshotter::LatLngForFn latLngForFn) { __typeof__(self) strongSelf = weakSelf; // If self had died, _snapshotCallback would have been destroyed and this block would not be executed @@ -224,7 +252,7 @@ const CGFloat MGLSnapshotterMinimumPixelSize = 64; NSString *description = @(mbgl::util::toString(mbglError).c_str()); NSDictionary *userInfo = @{NSLocalizedDescriptionKey: description}; NSError *error = [NSError errorWithDomain:MGLErrorDomain code:MGLErrorCodeSnapshotFailed userInfo:userInfo]; - + // Dispatch to result queue dispatch_async(queue, ^{ strongSelf.completion(nil, error); @@ -238,11 +266,12 @@ const CGFloat MGLSnapshotterMinimumPixelSize = 64; mglImage.size = NSMakeSize(mglImage.size.width / strongSelf.options.scale, mglImage.size.height / strongSelf.options.scale); #endif - [strongSelf drawAttributedSnapshot:attributions snapshotImage:mglImage pointForFn:pointForFn latLngForFn:latLngForFn]; + + [strongSelf drawAttributedSnapshot:attributions snapshotImage:mglImage pointForFn:pointForFn latLngForFn:latLngForFn overlayHandler:overlayHandler]; } strongSelf->_snapshotCallback = NULL; - }); + }); // Launches snapshot on background Thread owned by mbglMapSnapshotter // _snapshotCallback->self() is an ActorRef: if the callback is destroyed, further messages @@ -250,7 +279,7 @@ const CGFloat MGLSnapshotterMinimumPixelSize = 64; _mbglMapSnapshotter->snapshot(_snapshotCallback->self()); } -+ (MGLImage*)drawAttributedSnapshotWorker:(mbgl::MapSnapshotter::Attributions)attributions snapshotImage:(MGLImage *)mglImage pointForFn:(mbgl::MapSnapshotter::PointForFn)pointForFn latLngForFn:(mbgl::MapSnapshotter::LatLngForFn)latLngForFn scale:(CGFloat)scale size:(CGSize)size { ++ (MGLImage*)drawAttributedSnapshotWorker:(mbgl::MapSnapshotter::Attributions)attributions snapshotImage:(MGLImage *)mglImage pointForFn:(mbgl::MapSnapshotter::PointForFn)pointForFn latLngForFn:(mbgl::MapSnapshotter::LatLngForFn)latLngForFn scale:(CGFloat)scale size:(CGSize)size overlayHandler:(MGLMapSnapshotOverlayHandler)overlayHandler { NSArray<MGLAttributionInfo *>* attributionInfo = [MGLMapSnapshotter generateAttributionInfos:attributions]; @@ -292,7 +321,23 @@ const CGFloat MGLSnapshotterMinimumPixelSize = 64; UIGraphicsBeginImageContextWithOptions(mglImage.size, NO, scale); [mglImage drawInRect:CGRectMake(0, 0, mglImage.size.width, mglImage.size.height)]; - + + CGContextRef currentContext = UIGraphicsGetCurrentContext(); + + if (currentContext && overlayHandler) { + MGLMapSnapshotOverlay *snapshotOverlay = [[MGLMapSnapshotOverlay alloc] initWithContext:currentContext]; + CGContextSaveGState(snapshotOverlay.context); + overlayHandler(snapshotOverlay); + CGContextRestoreGState(snapshotOverlay.context); + currentContext = UIGraphicsGetCurrentContext(); + } + + if (!currentContext && overlayHandler) { + // If the current context has been corrupted by the user, + // return nil so we can generate an error later. + return nil; + } + [logoImage drawInRect:logoImageRect]; UIImage *currentImage = UIGraphicsGetImageFromCurrentImageContext(); @@ -359,6 +404,21 @@ const CGFloat MGLSnapshotterMinimumPixelSize = 64; [sourceImageRep drawInRect: targetFrame]; + NSGraphicsContext *currentContext = [NSGraphicsContext currentContext]; + if (currentContext && overlayHandler) { + MGLMapSnapshotOverlay *snapshotOverlay = [[MGLMapSnapshotOverlay alloc] initWithContext:currentContext.CGContext]; + [currentContext saveGraphicsState]; + overlayHandler(snapshotOverlay); + [currentContext restoreGraphicsState]; + currentContext = [NSGraphicsContext currentContext]; + } + + if (!currentContext && overlayHandler) { + // If the current context has been corrupted by the user, + // return nil so we can generate an error later. + return nil; + } + if (logoImage) { [logoImage drawInRect:logoImageRect]; } @@ -379,8 +439,8 @@ const CGFloat MGLSnapshotterMinimumPixelSize = 64; #endif } -- (void)drawAttributedSnapshot:(mbgl::MapSnapshotter::Attributions)attributions snapshotImage:(MGLImage *)mglImage pointForFn:(mbgl::MapSnapshotter::PointForFn)pointForFn latLngForFn:(mbgl::MapSnapshotter::LatLngForFn)latLngForFn { - +- (void)drawAttributedSnapshot:(mbgl::MapSnapshotter::Attributions)attributions snapshotImage:(MGLImage *)mglImage pointForFn:(mbgl::MapSnapshotter::PointForFn)pointForFn latLngForFn:(mbgl::MapSnapshotter::LatLngForFn)latLngForFn overlayHandler:(MGLMapSnapshotOverlayHandler)overlayHandler { + // Process image watermark in a work queue dispatch_queue_t workQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); dispatch_queue_t resultQueue = self.resultQueue; @@ -394,19 +454,30 @@ const CGFloat MGLSnapshotterMinimumPixelSize = 64; dispatch_async(workQueue, ^{ // Call a class method to ensure we're not accidentally capturing self - MGLImage *compositedImage = [MGLMapSnapshotter drawAttributedSnapshotWorker:attributions snapshotImage:mglImage pointForFn:pointForFn latLngForFn:latLngForFn scale:scale size:size]; + MGLImage *compositedImage = [MGLMapSnapshotter drawAttributedSnapshotWorker:attributions snapshotImage:mglImage pointForFn:pointForFn latLngForFn:latLngForFn scale:scale size:size overlayHandler:overlayHandler]; // Dispatch result to origin queue dispatch_async(resultQueue, ^{ __typeof__(self) strongself = weakself; if (strongself.completion) { - MGLMapSnapshot* snapshot = [[MGLMapSnapshot alloc] initWithImage:compositedImage - scale:scale - pointForFn:pointForFn - latLngForFn:latLngForFn]; - strongself.completion(snapshot, nil); - strongself.completion = nil; + + if (!compositedImage) { + NSDictionary *userInfo = @{NSLocalizedDescriptionKey: @"Failed to generate composited snapshot."}; + NSError *error = [NSError errorWithDomain:MGLErrorDomain + code:MGLErrorCodeSnapshotFailed + userInfo:userInfo]; + + strongself.completion(nil, error); + strongself.completion = nil; + } else { + MGLMapSnapshot* snapshot = [[MGLMapSnapshot alloc] initWithImage:compositedImage + scale:scale + pointForFn:pointForFn + latLngForFn:latLngForFn]; + strongself.completion(snapshot, nil); + strongself.completion = nil; + } } }); }); |