react-native/Libraries/ART/Brushes/ARTLinearGradient.m

50 lines
1.3 KiB
Objective-C

/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
#import "ARTLinearGradient.h"
#import "RCTConvert+ART.h"
#import "RCTLog.h"
@implementation ARTLinearGradient
{
CGGradientRef _gradient;
CGPoint _startPoint;
CGPoint _endPoint;
}
- (instancetype)initWithArray:(NSArray<NSNumber *> *)array
{
if ((self = [super initWithArray:array])) {
if (array.count < 5) {
RCTLogError(@"-[%@ %@] expects 5 elements, received %@",
self.class, NSStringFromSelector(_cmd), array);
return nil;
}
_startPoint = [RCTConvert CGPoint:array offset:1];
_endPoint = [RCTConvert CGPoint:array offset:3];
_gradient = CGGradientRetain([RCTConvert CGGradient:array offset:5]);
}
return self;
}
- (void)dealloc
{
CGGradientRelease(_gradient);
}
- (void)paint:(CGContextRef)context
{
CGGradientDrawingOptions extendOptions =
kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation;
CGContextDrawLinearGradient(context, _gradient, _startPoint, _endPoint, extendOptions);
}
@end