| // Copyright 2020 Google LLC. |
| // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file. |
| |
| #include "tools/skottie_ios_app/SkiaContext.h" |
| |
| #include "include/core/SkBitmap.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkSize.h" |
| #include "include/utils/mac/SkCGUtils.h" |
| #include "src/base/SkTime.h" |
| |
| #import <UIKit/UIKit.h> |
| |
| // A UIView that uses a CPU-backed SkSurface to draw. |
| @interface SkiaUIView : UIView |
| @property (strong) SkiaViewController* controller; |
| |
| // Override of the UIView interface. |
| - (void)drawRect:(CGRect)rect; |
| @end |
| |
| @implementation SkiaUIView { |
| SkBitmap fBackBuffer; |
| } |
| |
| - (void)drawRect:(CGRect)rect { |
| SkiaViewController* viewController = [self controller]; |
| static constexpr double kFrameRate = 1.0 / 30.0; |
| double next = [viewController isPaused] ? 0 : kFrameRate + SkTime::GetNSecs() * 1e-9; |
| [super drawRect:rect]; |
| CGSize size = [self bounds].size; |
| SkISize iSize = {(int)size.width, (int)size.height}; |
| if (fBackBuffer.drawsNothing() || iSize != fBackBuffer.dimensions()) { |
| fBackBuffer.allocN32Pixels(iSize.fWidth, iSize.fHeight); |
| } |
| fBackBuffer.eraseColor(SK_ColorTRANSPARENT); |
| { |
| SkCanvas canvas(fBackBuffer); |
| [viewController draw:rect toCanvas:&canvas atSize:size]; |
| } |
| SkCGDrawBitmap(UIGraphicsGetCurrentContext(), fBackBuffer, 0, 0); |
| if (next) { |
| [NSTimer scheduledTimerWithTimeInterval:std::max(0.0, next - SkTime::GetNSecs() * 1e-9) |
| target:self |
| selector:@selector(setNeedsDisplay) |
| userInfo:nil |
| repeats:NO]; |
| } |
| } |
| @end |
| |
| @interface SkiaUIContext : SkiaContext |
| - (UIView*) makeViewWithController:(SkiaViewController*)vc withFrame:(CGRect)frame; |
| - (SkiaViewController*) getViewController:(UIView*)view; |
| @end |
| |
| @implementation SkiaUIContext |
| - (UIView*) makeViewWithController:(SkiaViewController*)vc withFrame:(CGRect)frame { |
| SkiaUIView* skiaView = [[SkiaUIView alloc] initWithFrame:frame]; |
| [skiaView setController:vc]; |
| return skiaView; |
| } |
| - (SkiaViewController*) getViewController:(UIView*)view { |
| return [view isKindOfClass:[SkiaUIView class]] ? [(SkiaUIView*)view controller] : nil; |
| } |
| @end |
| |
| SkiaContext* MakeSkiaUIContext() { return [[SkiaUIContext alloc] init]; } |