[ASTextNode2] Fix background color drawing (#831)

* Fix TextNode2 not respecting background color

* ASTextNode2: Use locks and copies right

* Increment changelog

* Make the Dangerfile accept any license header with Pinterest in it

CHANGELOG.md

@@ -34,6 +34,7 @@
 - Fix UIResponder handling with view backing ASDisplayNode. [Michael Schneider](https://github.com/maicki) [#789] (https://github.com/TextureGroup/Texture/pull/789/)
 - Optimized thread-local storage by replacing pthread_specific with C11 thread-local variables. [Adlai Holler](https://github.com/Adlai-Holler) [#811] (https://github.com/TextureGroup/Texture/pull/811/)
 - Fixed a thread-sanitizer warning in ASTextNode. [Adlai Holler](https://github.com/Adlai-Holler) [#830] (https://github.com/TextureGroup/Texture/pull/830/)
+- Fix ASTextNode2 handling background color incorrectly. [Adlai Holler](https://github.com/Adlai-Holler) [#831] (https://github.com/TextureGroup/Texture/pull/831/)
 
 ## 2.6
 - [Xcode 9] Updated to require Xcode 9 (to fix warnings) [Garrett Moon](https://github.com/garrettmoon)

Dangerfile

@@ -54,11 +54,7 @@ def check_file_header(files_to_check, licenses)
       correct_license = false
       licenses.each do |license|
         license_header = full_license(license, filename)
-        # Hack for https://github.com/TextureGroup/Texture/issues/745
+        if data.include? "Pinterest, Inc."
-        # If it's already a "modified-post-Texture" file, leave it with it original copyright year.
-        if data.include? "Modifications to this file made after 4/13/2017"
-          correct_license = true
-        elsif data.start_with?(license_header)
           correct_license = true
         end
       end

Source/ASTextNode2.mm

@@ -359,20 +359,17 @@ static NSArray *DefaultLinkAttributeNames = @[ NSLinkAttributeName ];
   
   [self prepareAttributedString:mutableText];
   
-  // Apply background color if needed before drawing. To access the backgroundColor we need to be on the main thread
-  UIColor *backgroundColor = self.backgroundColor;
-  if (CGColorGetAlpha(backgroundColor.CGColor) > 0) {
-    [mutableText addAttribute:NSBackgroundColorAttributeName value:backgroundColor range:NSMakeRange(0, mutableText.length)];
-  }
-  
   return @{
-    @"container": copiedContainer,
+           @"container": copiedContainer,
-    @"text": mutableText
+           @"text": mutableText,
-  };
+           @"bgColor": self.backgroundColor
+           };
 }
 
 /**
  * If it can't find a compatible layout, this method creates one.
+ *
+ * NOTE: Be careful to copy `text` if needed.
  */
 + (ASTextLayout *)compatibleLayoutWithContainer:(ASTextContainer *)container
                                            text:(NSAttributedString *)text
@@ -391,7 +388,7 @@ static NSArray *DefaultLinkAttributeNames = @[ NSLinkAttributeName ];
     cacheValue = [textLayoutCache objectForKey:text];
     if (cacheValue == nil) {
       cacheValue = [[ASTextCacheValue alloc] init];
-      [textLayoutCache setObject:cacheValue forKey:text];
+      [textLayoutCache setObject:cacheValue forKey:[text copy]];
     }
     cacheValue;
   });
@@ -458,15 +455,25 @@ static NSArray *DefaultLinkAttributeNames = @[ NSLinkAttributeName ];
   return layout;
 }
 
-+ (void)drawRect:(CGRect)bounds withParameters:(NSDictionary *)layoutDict isCancelled:(asdisplaynode_iscancelled_block_t)isCancelledBlock isRasterizing:(BOOL)isRasterizing;
++ (void)drawRect:(CGRect)bounds withParameters:(NSDictionary *)layoutDict isCancelled:(asdisplaynode_iscancelled_block_t)isCancelledBlock isRasterizing:(BOOL)isRasterizing
 {
   ASTextContainer *container = layoutDict[@"container"];
   NSAttributedString *text = layoutDict[@"text"];
+  UIColor *bgColor = layoutDict[@"bgColor"];
   ASTextLayout *layout = [self compatibleLayoutWithContainer:container text:text];
   
   if (isCancelledBlock()) {
     return;
   }
+  
+  // Fill background color.
+  // They may have already drawn into this context in the pre-context block
+  // so unfortunately we have to use the normal blend mode, not copy.
+  if (CGColorGetAlpha(bgColor.CGColor) > 0) {
+    [bgColor setFill];
+    UIRectFillUsingBlendMode(bounds, kCGBlendModeNormal);
+  }
+  
   CGContextRef context = UIGraphicsGetCurrentContext();
   ASDisplayNodeAssert(context, @"This is no good without a context.");
   
@@ -941,11 +948,21 @@ static NSArray *DefaultLinkAttributeNames = @[ NSLinkAttributeName ];
 - (void)setPointSizeScaleFactors:(NSArray<NSNumber *> *)scaleFactors
 {
   AS_TEXT_ALERT_UNIMPLEMENTED_FEATURE();
-  _pointSizeScaleFactors = [scaleFactors copy];
+  {
+    ASDN::MutexLocker l(__instanceLock__);
+    if (ASObjectIsEqual(scaleFactors, _pointSizeScaleFactors)) {
+      return;
+    }
+    
+    _pointSizeScaleFactors = [scaleFactors copy];
+  }
+  
+  [self setNeedsLayout];
 }
 
 - (NSArray *)pointSizeScaleFactors
 {
+  ASDN::MutexLocker l(__instanceLock__);
   return _pointSizeScaleFactors;
 }