From 7b02207537d35bfa1714bf8beafc921f717d100a Mon Sep 17 00:00:00 2001
From: 单军华
Date: Wed, 11 Jul 2018 10:47:42 +0800
Subject: [PATCH] 首次上传
---
screendisplay/Pods/YYText/YYText/Utility/YYTextAsyncLayer.m | 234 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 234 insertions(+), 0 deletions(-)
diff --git a/screendisplay/Pods/YYText/YYText/Utility/YYTextAsyncLayer.m b/screendisplay/Pods/YYText/YYText/Utility/YYTextAsyncLayer.m
new file mode 100755
index 0000000..e94bc47
--- /dev/null
+++ b/screendisplay/Pods/YYText/YYText/Utility/YYTextAsyncLayer.m
@@ -0,0 +1,234 @@
+//
+// YYTextAsyncLayer.m
+// YYText <https://github.com/ibireme/YYText>
+//
+// Created by ibireme on 15/4/11.
+// Copyright (c) 2015 ibireme.
+//
+// This source code is licensed under the MIT-style license found in the
+// LICENSE file in the root directory of this source tree.
+//
+
+#import "YYTextAsyncLayer.h"
+#import <libkern/OSAtomic.h>
+
+
+/// Global display queue, used for content rendering.
+static dispatch_queue_t YYTextAsyncLayerGetDisplayQueue() {
+#define MAX_QUEUE_COUNT 16
+ static int queueCount;
+ static dispatch_queue_t queues[MAX_QUEUE_COUNT];
+ static dispatch_once_t onceToken;
+ static int32_t counter = 0;
+ dispatch_once(&onceToken, ^{
+ queueCount = (int)[NSProcessInfo processInfo].activeProcessorCount;
+ queueCount = queueCount < 1 ? 1 : queueCount > MAX_QUEUE_COUNT ? MAX_QUEUE_COUNT : queueCount;
+ if ([UIDevice currentDevice].systemVersion.floatValue >= 8.0) {
+ for (NSUInteger i = 0; i < queueCount; i++) {
+ dispatch_queue_attr_t attr = dispatch_queue_attr_make_with_qos_class(DISPATCH_QUEUE_SERIAL, QOS_CLASS_USER_INITIATED, 0);
+ queues[i] = dispatch_queue_create("com.ibireme.text.render", attr);
+ }
+ } else {
+ for (NSUInteger i = 0; i < queueCount; i++) {
+ queues[i] = dispatch_queue_create("com.ibireme.text.render", DISPATCH_QUEUE_SERIAL);
+ dispatch_set_target_queue(queues[i], dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0));
+ }
+ }
+ });
+ uint32_t cur = (uint32_t)OSAtomicIncrement32(&counter);
+ return queues[(cur) % queueCount];
+#undef MAX_QUEUE_COUNT
+}
+
+static dispatch_queue_t YYTextAsyncLayerGetReleaseQueue() {
+#ifdef YYDispatchQueuePool_h
+ return YYDispatchQueueGetForQOS(NSQualityOfServiceDefault);
+#else
+ return dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0);
+#endif
+}
+
+
+/// a thread safe incrementing counter.
+@interface _YYTextSentinel : NSObject
+/// Returns the current value of the counter.
+@property (atomic, readonly) int32_t value;
+/// Increase the value atomically. @return The new value.
+- (int32_t)increase;
+@end
+
+@implementation _YYTextSentinel {
+ int32_t _value;
+}
+- (int32_t)value {
+ return _value;
+}
+- (int32_t)increase {
+ return OSAtomicIncrement32(&_value);
+}
+@end
+
+
+@implementation YYTextAsyncLayerDisplayTask
+@end
+
+
+@implementation YYTextAsyncLayer {
+ _YYTextSentinel *_sentinel;
+}
+
+#pragma mark - Override
+
++ (id)defaultValueForKey:(NSString *)key {
+ if ([key isEqualToString:@"displaysAsynchronously"]) {
+ return @(YES);
+ } else {
+ return [super defaultValueForKey:key];
+ }
+}
+
+- (instancetype)init {
+ self = [super init];
+ static CGFloat scale; //global
+ static dispatch_once_t onceToken;
+ dispatch_once(&onceToken, ^{
+ scale = [UIScreen mainScreen].scale;
+ });
+ self.contentsScale = scale;
+ _sentinel = [_YYTextSentinel new];
+ _displaysAsynchronously = YES;
+ return self;
+}
+
+- (void)dealloc {
+ [_sentinel increase];
+}
+
+- (void)setNeedsDisplay {
+ [self _cancelAsyncDisplay];
+ [super setNeedsDisplay];
+}
+
+- (void)display {
+ super.contents = super.contents;
+ [self _displayAsync:_displaysAsynchronously];
+}
+
+#pragma mark - Private
+
+- (void)_displayAsync:(BOOL)async {
+ __strong id<YYTextAsyncLayerDelegate> delegate = (id)self.delegate;
+ YYTextAsyncLayerDisplayTask *task = [delegate newAsyncDisplayTask];
+ if (!task.display) {
+ if (task.willDisplay) task.willDisplay(self);
+ self.contents = nil;
+ if (task.didDisplay) task.didDisplay(self, YES);
+ return;
+ }
+
+ if (async) {
+ if (task.willDisplay) task.willDisplay(self);
+ _YYTextSentinel *sentinel = _sentinel;
+ int32_t value = sentinel.value;
+ BOOL (^isCancelled)() = ^BOOL() {
+ return value != sentinel.value;
+ };
+ CGSize size = self.bounds.size;
+ BOOL opaque = self.opaque;
+ CGFloat scale = self.contentsScale;
+ CGColorRef backgroundColor = (opaque && self.backgroundColor) ? CGColorRetain(self.backgroundColor) : NULL;
+ if (size.width < 1 || size.height < 1) {
+ CGImageRef image = (__bridge_retained CGImageRef)(self.contents);
+ self.contents = nil;
+ if (image) {
+ dispatch_async(YYTextAsyncLayerGetReleaseQueue(), ^{
+ CFRelease(image);
+ });
+ }
+ if (task.didDisplay) task.didDisplay(self, YES);
+ CGColorRelease(backgroundColor);
+ return;
+ }
+
+ dispatch_async(YYTextAsyncLayerGetDisplayQueue(), ^{
+ if (isCancelled()) {
+ CGColorRelease(backgroundColor);
+ return;
+ }
+ UIGraphicsBeginImageContextWithOptions(size, opaque, scale);
+ CGContextRef context = UIGraphicsGetCurrentContext();
+ if (opaque) {
+ CGContextSaveGState(context); {
+ if (!backgroundColor || CGColorGetAlpha(backgroundColor) < 1) {
+ CGContextSetFillColorWithColor(context, [UIColor whiteColor].CGColor);
+ CGContextAddRect(context, CGRectMake(0, 0, size.width * scale, size.height * scale));
+ CGContextFillPath(context);
+ }
+ if (backgroundColor) {
+ CGContextSetFillColorWithColor(context, backgroundColor);
+ CGContextAddRect(context, CGRectMake(0, 0, size.width * scale, size.height * scale));
+ CGContextFillPath(context);
+ }
+ } CGContextRestoreGState(context);
+ CGColorRelease(backgroundColor);
+ }
+ task.display(context, size, isCancelled);
+ if (isCancelled()) {
+ UIGraphicsEndImageContext();
+ dispatch_async(dispatch_get_main_queue(), ^{
+ if (task.didDisplay) task.didDisplay(self, NO);
+ });
+ return;
+ }
+ UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
+ UIGraphicsEndImageContext();
+ if (isCancelled()) {
+ dispatch_async(dispatch_get_main_queue(), ^{
+ if (task.didDisplay) task.didDisplay(self, NO);
+ });
+ return;
+ }
+ dispatch_async(dispatch_get_main_queue(), ^{
+ if (isCancelled()) {
+ if (task.didDisplay) task.didDisplay(self, NO);
+ } else {
+ self.contents = (__bridge id)(image.CGImage);
+ if (task.didDisplay) task.didDisplay(self, YES);
+ }
+ });
+ });
+ } else {
+ [_sentinel increase];
+ if (task.willDisplay) task.willDisplay(self);
+ UIGraphicsBeginImageContextWithOptions(self.bounds.size, self.opaque, self.contentsScale);
+ CGContextRef context = UIGraphicsGetCurrentContext();
+ if (self.opaque) {
+ CGSize size = self.bounds.size;
+ size.width *= self.contentsScale;
+ size.height *= self.contentsScale;
+ CGContextSaveGState(context); {
+ if (!self.backgroundColor || CGColorGetAlpha(self.backgroundColor) < 1) {
+ CGContextSetFillColorWithColor(context, [UIColor whiteColor].CGColor);
+ CGContextAddRect(context, CGRectMake(0, 0, size.width, size.height));
+ CGContextFillPath(context);
+ }
+ if (self.backgroundColor) {
+ CGContextSetFillColorWithColor(context, self.backgroundColor);
+ CGContextAddRect(context, CGRectMake(0, 0, size.width, size.height));
+ CGContextFillPath(context);
+ }
+ } CGContextRestoreGState(context);
+ }
+ task.display(context, self.bounds.size, ^{return NO;});
+ UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
+ UIGraphicsEndImageContext();
+ self.contents = (__bridge id)(image.CGImage);
+ if (task.didDisplay) task.didDisplay(self, YES);
+ }
+}
+
+- (void)_cancelAsyncDisplay {
+ [_sentinel increase];
+}
+
+@end
--
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