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Add an experimental "no-copy" renderer (TextureGroup#741)
* Add "ASGraphicsContext" to skip copying our rendered images * Zero the buffer before making a context * Update license header * Update dangerfile * Make it a runtime flag * Restore GState for good measure * Free buffer if end without image * Enable the experiment, and cut out the middle-man * Fix typo
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// | ||
// ASGraphicsContext.h | ||
// Texture | ||
// | ||
// Copyright (c) 2018-present, Pinterest, Inc. All rights reserved. | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
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#import <Foundation/Foundation.h> | ||
#import <AsyncDisplayKit/ASBaseDefines.h> | ||
#import <CoreGraphics/CoreGraphics.h> | ||
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@class UIImage; | ||
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/** | ||
* Functions for creating one-shot graphics contexts that do not have to copy | ||
* their contents when an image is generated from them. This is efficient | ||
* for our use, since we do not reuse graphics contexts. | ||
* | ||
* The API mirrors the UIGraphics API, with the exception that forming an image | ||
* ends the context as well. | ||
*/ | ||
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NS_ASSUME_NONNULL_BEGIN | ||
ASDISPLAYNODE_EXTERN_C_BEGIN | ||
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/** | ||
* Call this to enable the experimental no-copy rendering. | ||
* | ||
* Returns YES if it was enabled, or NO + assert if it's too late because | ||
* rendering has already started. In practice it's fine to call this | ||
* during -didFinishLaunchingWithOptions:. | ||
*/ | ||
extern BOOL ASEnableNoCopyRendering(void); | ||
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/** | ||
* Creates a one-shot context. | ||
* | ||
* Behavior is the same as UIGraphicsBeginImageContextWithOptions. | ||
*/ | ||
extern void ASGraphicsBeginImageContextWithOptions(CGSize size, BOOL opaque, CGFloat scale); | ||
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/** | ||
* Generates and image and ends the current one-shot context. | ||
* | ||
* Behavior is the same as UIGraphicsGetImageFromCurrentImageContext followed by UIGraphicsEndImageContext. | ||
*/ | ||
extern UIImage * _Nullable ASGraphicsGetImageAndEndCurrentContext(void); | ||
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/** | ||
* Call this if you want to end the current context without making an image. | ||
* | ||
* Behavior is the same as UIGraphicsEndImageContext. | ||
*/ | ||
extern void ASGraphicsEndImageContext(void); | ||
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ASDISPLAYNODE_EXTERN_C_END | ||
NS_ASSUME_NONNULL_END |
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