39 lines
1.5 KiB
C
39 lines
1.5 KiB
C
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/*
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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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* Returns the optimal context size for an image drawn using the clip rect
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* returned by RCTClipRect.
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*/
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RCT_EXTERN CGSize RCTTargetSizeForClipRect(CGRect clipRect);
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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 drawn into (typically a CGContext) and
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* then calculates the optimal rectangle to draw the image into so that it will
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* be sized and positioned correctly if drawn using the specified content mode.
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*/
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RCT_EXTERN CGRect RCTClipRect(CGSize sourceSize, CGFloat sourceScale,
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CGSize destSize, CGFloat destScale,
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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 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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