43 lines
1.8 KiB
Objective-C
43 lines
1.8 KiB
Objective-C
/*
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* Copyright (c) 2013, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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*/
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#import <UIKit/UIKit.h>
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#import "RCTDefines.h"
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/**
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* This function takes an input content size (typically from an image), a target
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* size and scale that it will be drawn at (typically in a CGContext) and then
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* calculates the rectangle to draw the image into so that it will be sized and
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* positioned correctly if drawn using the specified content mode.
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*/
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RCT_EXTERN CGRect RCTTargetRect(CGSize sourceSize, CGSize destSize,
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CGFloat destScale, UIViewContentMode resizeMode);
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/**
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* This function takes an input content size & scale (typically from an image),
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* a target size & scale at which it will be displayed (typically in a
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* UIImageView) and then calculates the optimal size at which to redraw the
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* image so that it will be displayed correctly with the specified content mode.
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*/
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RCT_EXTERN CGSize RCTTargetSize(CGSize sourceSize, CGFloat sourceScale,
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CGSize destSize, CGFloat destScale,
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UIViewContentMode resizeMode,
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BOOL allowUpscaling);
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/**
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* This function takes an input content size & scale (typically from an image),
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* a target size & scale that it will be displayed at, and determines if the
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* source will need to be upscaled to fit (which may result in pixelization).
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*/
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RCT_EXTERN BOOL RCTUpscalingRequired(CGSize sourceSize, CGFloat sourceScale,
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CGSize destSize, CGFloat destScale,
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UIViewContentMode resizeMode);
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