experimental/skottie_ios: Skottie iOS/Metal App
To use, see instructions in experimental/skottie_ios/README.md .
No-Try: true
Change-Id: I4fb71576c5e38c7776d14561930b8c2598cfb48f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/240284
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>
diff --git a/experimental/skottie_ios/main.mm b/experimental/skottie_ios/main.mm
new file mode 100644
index 0000000..73ea26d
--- /dev/null
+++ b/experimental/skottie_ios/main.mm
@@ -0,0 +1,141 @@
+// Copyright 2019 Google LLC.
+// Use of this source cofcee is governed by a BSD-style license that can be found in the LICENSE file.
+
+#include "experimental/skottie_ios/SkMetalViewBridge.h"
+#include "experimental/skottie_ios/SkottieMtkView.h"
+
+#include "include/gpu/GrContext.h"
+#include "include/gpu/GrContextOptions.h"
+
+#import <Metal/Metal.h>
+#import <MetalKit/MetalKit.h>
+#import <UIKit/UIKit.h>
+
+static UIStackView* make_skottie_stack(CGFloat width,
+ id<MTLDevice> metalDevice,
+ GrContext* grContext) {
+ UIStackView* stack = [[UIStackView alloc] init];
+ [stack setAxis:UILayoutConstraintAxisVertical];
+ [stack setDistribution:UIStackViewDistributionEqualSpacing];
+
+ NSBundle* mainBundle = [NSBundle mainBundle];
+ NSArray<NSString*>* paths = [mainBundle pathsForResourcesOfType:@"json"
+ inDirectory:nil];
+ constexpr CGFloat kSpacing = 2;
+ CGFloat totalHeight = kSpacing;
+ for (NSUInteger i = 0; i < [paths count]; ++i) {
+ NSString* path = [paths objectAtIndex:i];
+ NSData* content = [NSData dataWithContentsOfFile:path];
+ if (!content) {
+ NSLog(@"'%@' not found", path);
+ continue;
+ }
+ SkottieMtkView* skottieView = [[SkottieMtkView alloc] init];
+ if (![skottieView loadAnimation:content]) {
+ continue;
+ }
+ [skottieView setDevice:metalDevice];
+ [skottieView setGrContext:grContext];
+ SkMtkViewConfigForSkia(skottieView);
+ CGSize animSize = [skottieView size];
+ CGFloat height = animSize.width ? (width * animSize.height / animSize.width) : 0;
+ [skottieView setFrame:{{0, 0}, {width, height}}];
+ [skottieView setPreferredFramesPerSecond:30];
+ [[[skottieView heightAnchor] constraintEqualToConstant:height] setActive:true];
+ [[[skottieView widthAnchor] constraintEqualToConstant:width] setActive:true];
+ [stack addArrangedSubview:skottieView];
+ totalHeight += height + kSpacing;
+ }
+ [stack setFrame:{{0, 0}, {width, totalHeight}}];
+ return stack;
+}
+
+@interface AppViewController : UIViewController
+ @property (strong) id<MTLDevice> metalDevice;
+ @property (strong) UIStackView* stackView;
+@end
+
+@implementation AppViewController {
+ sk_sp<GrContext> fGrContext;
+}
+
+- (void)dealloc {
+ fGrContext = nullptr;
+ [super dealloc];
+}
+
+- (void)loadView {
+ [self setView:[[UIView alloc] init]];
+}
+
+- (void)viewDidLoad {
+ [super viewDidLoad];
+ if (!fGrContext) {
+ [self setMetalDevice:MTLCreateSystemDefaultDevice()];
+ if(![self metalDevice]) {
+ NSLog(@"Metal is not supported on this device");
+ return;
+ }
+ GrContextOptions grContextOptions; // set different options here.
+ fGrContext = SkMetalDeviceToGrContext([self metalDevice], grContextOptions);
+ }
+
+ [self setStackView:make_skottie_stack([[UIScreen mainScreen] bounds].size.width,
+ [self metalDevice], fGrContext.get())];
+
+ CGFloat statusBarHeight = [[UIApplication sharedApplication] statusBarFrame].size.height;
+ CGSize mainScreenSize = [[UIScreen mainScreen] bounds].size;
+ CGRect scrollViewBounds = {{0, statusBarHeight},
+ {mainScreenSize.width, mainScreenSize.height - statusBarHeight}};
+ UIScrollView* scrollView = [[UIScrollView alloc] initWithFrame:scrollViewBounds];
+ [scrollView setContentSize:[[self stackView] frame].size];
+ [scrollView addSubview:[self stackView]];
+ [scrollView setBackgroundColor:[UIColor blackColor]];
+
+ UIView* mainView = [self view];
+ [mainView setBounds:{{0, 0}, mainScreenSize}];
+ [mainView setBackgroundColor:[UIColor whiteColor]];
+ [mainView addSubview:scrollView];
+
+ UITapGestureRecognizer* tapGestureRecognizer = [[UITapGestureRecognizer alloc] init];
+ [tapGestureRecognizer addTarget:self action:@selector(handleTap:)];
+ [mainView addGestureRecognizer:tapGestureRecognizer];
+}
+
+- (void)handleTap:(UIGestureRecognizer*)sender {
+ if (![sender state] == UIGestureRecognizerStateEnded) {
+ return;
+ }
+ NSArray<UIView*>* subviews = [[self stackView] subviews];
+ for (NSUInteger i = 0; i < [subviews count]; ++i) {
+ UIView* subview = [subviews objectAtIndex:i];
+ if (![subview isKindOfClass:[SkottieMtkView class]]) {
+ continue;
+ }
+ SkottieMtkView* skottieView = (SkottieMtkView*)subview;
+ BOOL paused = [skottieView togglePaused];
+ [skottieView setEnableSetNeedsDisplay:paused];
+ [skottieView setPaused:paused];
+ }
+}
+@end
+
+@interface AppDelegate : UIResponder <UIApplicationDelegate>
+@property (strong, nonatomic) UIWindow* window;
+@end
+
+@implementation AppDelegate
+
+- (BOOL)application:(UIApplication*)app didFinishLaunchingWithOptions:(NSDictionary*)ops {
+ [self setWindow:[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]];
+ [[self window] setRootViewController:[[AppViewController alloc] init]];
+ [[self window] makeKeyAndVisible];
+ return YES;
+}
+@end
+
+int main(int argc, char* argv[]) {
+ @autoreleasepool {
+ return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
+ }
+}