blob: 529f32f59383bac6e0ea0e1b6cf4cc64c6b06cbe [file] [log] [blame]
// 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/SkCanvas.h"
#include "include/core/SkTime.h"
#include "include/utils/mac/SkCGUtils.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]; }