mirror of
https://github.com/status-im/react-native.git
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fe4b4c2d83
Summary:
@public
Our background color propagation mechanism is designed to make rendering of translucent content more efficient by pre-blending against an opaque background. Currently this only works for text however, because images are not composited into their background even if the background color is opaque.
This diff precomposites network images with their background color when the background is opaque, allowing them to take advantage of this performance optimization.
I've also added some logic to correctly crop the downloaded image when the resizeMode is "cover" or "contain" - previously it was only correct for "stretch".
Before:{F22437859}
After:{F22437862}
Test Plan: Run the UIExplorer "<ListView> - Paging" example with "color blended layers" enabled and observe that the images appear in green now, instead of red as they did before.
58 lines
2.2 KiB
Objective-C
58 lines
2.2 KiB
Objective-C
/**
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* Copyright (c) 2015-present, 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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#import <tgmath.h>
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#import <CoreGraphics/CoreGraphics.h>
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#import <Foundation/Foundation.h>
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#import "RCTAssert.h"
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#import "RCTDefines.h"
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// Utility functions for JSON object <-> string serialization/deserialization
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RCT_EXTERN NSString *RCTJSONStringify(id jsonObject, NSError **error);
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RCT_EXTERN id RCTJSONParse(NSString *jsonString, NSError **error);
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// Strip non JSON-safe values from an object graph
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RCT_EXTERN id RCTJSONClean(id object);
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// Get MD5 hash of a string (TODO: currently unused. Remove?)
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RCT_EXTERN NSString *RCTMD5Hash(NSString *string);
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// Get screen metrics in a thread-safe way
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RCT_EXTERN CGFloat RCTScreenScale(void);
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RCT_EXTERN CGSize RCTScreenSize(void);
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// Round float coordinates to nearest whole screen pixel (not point)
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RCT_EXTERN CGFloat RCTRoundPixelValue(CGFloat value);
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RCT_EXTERN CGFloat RCTCeilPixelValue(CGFloat value);
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RCT_EXTERN CGFloat RCTFloorPixelValue(CGFloat value);
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// Get current time, for precise performance metrics
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RCT_EXTERN NSTimeInterval RCTTGetAbsoluteTime(void);
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// Method swizzling
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RCT_EXTERN void RCTSwapClassMethods(Class cls, SEL original, SEL replacement);
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RCT_EXTERN void RCTSwapInstanceMethods(Class cls, SEL original, SEL replacement);
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// Module subclass support
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RCT_EXTERN BOOL RCTClassOverridesClassMethod(Class cls, SEL selector);
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RCT_EXTERN BOOL RCTClassOverridesInstanceMethod(Class cls, SEL selector);
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// Creates a standardized error object
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// TODO(#6472857): create NSErrors and automatically convert them over the bridge.
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RCT_EXTERN NSDictionary *RCTMakeError(NSString *message, id toStringify, NSDictionary *extraData);
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RCT_EXTERN NSDictionary *RCTMakeAndLogError(NSString *message, id toStringify, NSDictionary *extraData);
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// Returns YES if React is running in a test environment
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RCT_EXTERN BOOL RCTRunningInTestEnvironment(void);
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// Return YES if image has an alpha component
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RCT_EXTERN BOOL RCTImageHasAlpha(CGImageRef image);
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