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1// Copyright 2020 Google LLC.
2// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
3
4#include "tools/skottie_ios_app/SkiaContext.h"
5
6#include "include/core/SkCanvas.h"
7#include "include/core/SkTime.h"
8#include "include/utils/mac/SkCGUtils.h"
9
10#import <UIKit/UIKit.h>
11
12// A UIView that uses a CPU-backed SkSurface to draw.
13@interface SkiaUIView : UIView
14    @property (strong) SkiaViewController* controller;
15
16    // Override of the UIView interface.
17    - (void)drawRect:(CGRect)rect;
18@end
19
20@implementation SkiaUIView {
21    SkBitmap fBackBuffer;
22}
23
24- (void)drawRect:(CGRect)rect {
25    SkiaViewController* viewController = [self controller];
26    static constexpr double kFrameRate = 1.0 / 30.0;
27    double next = [viewController isPaused] ? 0 : kFrameRate + SkTime::GetNSecs() * 1e-9;
28    [super drawRect:rect];
29    CGSize size = [self bounds].size;
30    SkISize iSize = {(int)size.width, (int)size.height};
31    if (fBackBuffer.drawsNothing() || iSize != fBackBuffer.dimensions()) {
32        fBackBuffer.allocN32Pixels(iSize.fWidth, iSize.fHeight);
33    }
34    fBackBuffer.eraseColor(SK_ColorTRANSPARENT);
35    {
36        SkCanvas canvas(fBackBuffer);
37        [viewController draw:rect toCanvas:&canvas atSize:size];
38    }
39    SkCGDrawBitmap(UIGraphicsGetCurrentContext(), fBackBuffer, 0, 0);
40    if (next) {
41        [NSTimer scheduledTimerWithTimeInterval:std::max(0.0, next - SkTime::GetNSecs() * 1e-9)
42                 target:self
43                 selector:@selector(setNeedsDisplay)
44                 userInfo:nil
45                 repeats:NO];
46    }
47}
48@end
49
50@interface SkiaUIContext : SkiaContext
51    - (UIView*) makeViewWithController:(SkiaViewController*)vc withFrame:(CGRect)frame;
52    - (SkiaViewController*) getViewController:(UIView*)view;
53@end
54
55@implementation SkiaUIContext
56- (UIView*) makeViewWithController:(SkiaViewController*)vc withFrame:(CGRect)frame {
57    SkiaUIView* skiaView = [[SkiaUIView alloc] initWithFrame:frame];
58    [skiaView setController:vc];
59    return skiaView;
60}
61- (SkiaViewController*) getViewController:(UIView*)view {
62    return [view isKindOfClass:[SkiaUIView class]] ? [(SkiaUIView*)view controller] : nil;
63}
64@end
65
66SkiaContext* MakeSkiaUIContext() { return [[SkiaUIContext alloc] init]; }
67