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Simplify/optimize rounded image generation (#2292)

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This commit is contained in:
Adlai Holler
2016-09-27 18:42:46 -04:00
committed by GitHub
parent e85583523f
commit 8a4d4e3b5c
1 changed files with 20 additions and 26 deletions
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46
AsyncDisplayKit/UIImage+ASConvenience.m
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@@ -12,12 +12,11 @@
#import "UIImage+ASConvenience.h"
#import <UIKit/UIKit.h>
#import "ASInternalHelpers.h"
#import "ASAssert.h"
@implementation UIImage (ASDKAdditions)
+ (UIImage *)as_resizableRoundedImageWithCornerRadius:(CGFloat)cornerRadius
cornerColor:(UIColor *)cornerColor
fillColor:(UIColor *)fillColor
@@ -70,41 +69,35 @@
CGFloat dimension = (cornerRadius * 2) + 1;
CGRect bounds = CGRectMake(0, 0, dimension, dimension);
// This is a hack to make one NSNumber key out of the corners and cornerRadius
if (roundedCorners == UIRectCornerAllCorners) {
// UIRectCornerAllCorners is ~0, but below is equivalent and we can pack it into half an NSUInteger
roundedCorners = UIRectCornerTopLeft | UIRectCornerTopRight | UIRectCornerBottomLeft | UIRectCornerBottomRight;
}
// Left half of NSUInteger is roundedCorners, right half is cornerRadius
UInt64 pathKeyNSUInteger = (UInt64)roundedCorners << sizeof(Float32) * 8;
Float32 floatCornerRadius = cornerRadius;
pathKeyNSUInteger |= (NSUInteger)floatCornerRadius;
NSNumber *pathKey = [NSNumber numberWithUnsignedLongLong:pathKeyNSUInteger];
UIBezierPath *path = nil;
CGSize cornerRadii = CGSizeMake(cornerRadius, cornerRadius);
@synchronized(__pathCache) {
path = [__pathCache objectForKey:pathKey];
if (!path) {
path = [UIBezierPath bezierPathWithRoundedRect:bounds byRoundingCorners:roundedCorners cornerRadii:cornerRadii];
[__pathCache setObject:path forKey:pathKey];
}
typedef struct {
UIRectCorner corners;
CGFloat radius;
} PathKey;
PathKey key = { roundedCorners, cornerRadius };
NSValue *pathKeyObject = [[NSValue alloc] initWithBytes:&key objCType:@encode(PathKey)];
UIBezierPath *path = [__pathCache objectForKey:pathKeyObject];
if (path == nil) {
CGSize cornerRadii = CGSizeMake(cornerRadius, cornerRadius);
path = [UIBezierPath bezierPathWithRoundedRect:bounds byRoundingCorners:roundedCorners cornerRadii:cornerRadii];
[__pathCache setObject:path forKey:pathKeyObject];
}
// We should probably check if the background color has any alpha component but that
// might be expensive due to needing to check mulitple color spaces.
UIGraphicsBeginImageContextWithOptions(bounds.size, cornerColor != nil, scale);
BOOL contextIsClean = YES;
if (cornerColor) {
contextIsClean = NO;
[cornerColor setFill];
// Copy "blend" mode is extra fast because it disregards any value currently in the buffer and overwrites directly.
UIRectFillUsingBlendMode(bounds, kCGBlendModeCopy);
}
BOOL canUseCopy = contextIsClean || (CGColorGetAlpha(fillColor.CGColor) == 1);
[fillColor setFill];
[path fill];
[path fillWithBlendMode:(canUseCopy ? kCGBlendModeCopy : kCGBlendModeNormal) alpha:1];
if (borderColor) {
[borderColor setStroke];
@@ -116,7 +109,8 @@
// size calculated by cornerRadius, so we won't bother caching this path. Profiling validates this decision.
UIBezierPath *strokePath = [UIBezierPath bezierPathWithRoundedRect:strokeRect cornerRadius:cornerRadius];
[strokePath setLineWidth:borderWidth];
[strokePath stroke];
BOOL canUseCopy = (CGColorGetAlpha(borderColor.CGColor) == 1);
[strokePath strokeWithBlendMode:(canUseCopy ? kCGBlendModeCopy : kCGBlendModeNormal) alpha:1];
}
UIImage *result = UIGraphicsGetImageFromCurrentImageContext();