97 lines
4.1 KiB
C
97 lines
4.1 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 <React/RCTDefines.h>
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#import <React/RCTResizeMode.h>
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NS_ASSUME_NONNULL_BEGIN
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/**
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* This function takes an source size (typically from an image), a target size
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* 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 according to the specified resizeMode.
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*/
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RCT_EXTERN CGRect RCTTargetRect(CGSize sourceSize, CGSize destSize,
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CGFloat destScale, RCTResizeMode resizeMode);
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/**
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* This function takes a source size (typically from an image), a target rect
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* that it will be drawn into (typically relative to a CGContext), and works out
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* the transform needed to draw the image at the correct scale and position.
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*/
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RCT_EXTERN CGAffineTransform RCTTransformFromTargetRect(CGSize sourceSize,
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CGRect targetRect);
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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 resizeMode.
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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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RCTResizeMode resizeMode, 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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RCTResizeMode resizeMode);
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/**
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* This function takes the source data for an image and decodes it at the
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* specified size. If the original image is smaller than the destination size,
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* the resultant image's scale will be decreased to compensate, so the
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* width/height of the returned image is guaranteed to be >= destSize.
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* Pass a destSize of CGSizeZero to decode the image at its original size.
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*/
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RCT_EXTERN UIImage *__nullable RCTDecodeImageWithData(NSData *data,
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CGSize destSize,
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CGFloat destScale,
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RCTResizeMode resizeMode);
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/**
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* This function takes the source data for an image and decodes just the
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* metadata, without decompressing the image itself.
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*/
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RCT_EXTERN NSDictionary<NSString *, id> *__nullable RCTGetImageMetadata(NSData *data);
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/**
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* Convert an image back into data. Images with an alpha channel will be
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* converted to lossless PNG data. Images without alpha will be converted to
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* JPEG. The `quality` argument controls the compression ratio of the JPEG
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* conversion, with 1.0 being maximum quality. It has no effect for images
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* using PNG compression.
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*/
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RCT_EXTERN NSData *__nullable RCTGetImageData(UIImage *image, float quality);
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/**
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* This function transforms an image. `destSize` is the size of the final image,
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* and `destScale` is its scale. The `transform` argument controls how the
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* source image will be mapped to the destination image.
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*/
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RCT_EXTERN UIImage *__nullable RCTTransformImage(UIImage *image,
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CGSize destSize,
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CGFloat destScale,
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CGAffineTransform transform);
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/*
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* Return YES if image has an alpha component
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*/
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RCT_EXTERN BOOL RCTImageHasAlpha(CGImageRef image);
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NS_ASSUME_NONNULL_END
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