//
//  OTScreenCapture.h
//  Screen-Sharing
//
//  Copyright (c) 2014 TokBox Inc. All rights reserved.
//

#import <Foundation/Foundation.h>
#import <OpenTok/OpenTok.h>

@protocol OTVideoCapture;

// defines for image scaling
// From https://bugs.chromium.org/p/webrtc/issues/detail?id=4643#c7 :
// Don't send any image larger than 1280px on either edge. Additionally, don't
// send any image with dimensions %16 != 0
#define MAX_EDGE_SIZE_LIMIT 1280.0f
#define EDGE_DIMENSION_COMMON_FACTOR 16.0f

/**
 * Periodically sends video frames to an OpenTok Publisher by rendering the
 * CALayer for a UIView.
 */
@interface OTScreenCapture : NSObject <OTVideoCapture>

@property(readonly) UIView* view;

/**
 * Initializes a video capturer that will grab rendered stills of the view.
 */
- (instancetype)initWithView:(UIView*)view;

// private: declared here for testing scaling & padding function
+ (void)dimensionsForInputSize:(CGSize)input
                 containerSize:(CGSize*)destContainerSize
                      drawRect:(CGRect*)destDrawRect;

@end