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