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Optimizations for ASTextNode handling of renderer allocation and deallocation.

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Optimizations for ASDisplayNode handling of bridged property "contentMode", especially for layer-backed nodes.
This commit is contained in:
Scott Goodson
2015-12-25 01:36:32 -08:00
parent 1ec1957b44
commit 99fbc97bda
6 changed files with 107 additions and 25 deletions
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58
AsyncDisplayKit/TextKit/ASTextKitRenderer.mm
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@@ -32,7 +32,9 @@ static NSCharacterSet *_defaultAvoidTruncationCharacterSet()
@implementation ASTextKitRenderer {
CGSize _calculatedSize;
BOOL _sizeIsCalculated;
}
@synthesize attributes = _attributes, context = _context, shadower = _shadower, truncater = _truncater;
#pragma mark - Initialization
@@ -42,30 +44,50 @@ static NSCharacterSet *_defaultAvoidTruncationCharacterSet()
if (self = [super init]) {
_constrainedSize = constrainedSize;
_attributes = attributes;
_sizeIsCalculated = NO;
}
return self;
}
- (ASTextKitShadower *)shadower
{
if (!_shadower) {
ASTextKitAttributes attributes = _attributes;
_shadower = [[ASTextKitShadower alloc] initWithShadowOffset:attributes.shadowOffset
shadowColor:attributes.shadowColor
shadowOpacity:attributes.shadowOpacity
shadowRadius:attributes.shadowRadius];
}
return _shadower;
}
- (ASTextKitTailTruncater *)truncater
{
if (!_truncater) {
ASTextKitAttributes attributes = _attributes;
// We must inset the constrained size by the size of the shadower.
CGSize shadowConstrainedSize = [_shadower insetSizeWithConstrainedSize:_constrainedSize];
CGSize shadowConstrainedSize = [[self shadower] insetSizeWithConstrainedSize:_constrainedSize];
_truncater = [[ASTextKitTailTruncater alloc] initWithContext:[self context]
truncationAttributedString:attributes.truncationAttributedString
avoidTailTruncationSet:attributes.avoidTailTruncationSet ?: _defaultAvoidTruncationCharacterSet()
constrainedSize:shadowConstrainedSize];
}
return _truncater;
}
- (ASTextKitContext *)context
{
if (!_context) {
ASTextKitAttributes attributes = _attributes;
CGSize shadowConstrainedSize = [[self shadower] insetSizeWithConstrainedSize:_constrainedSize];
_context = [[ASTextKitContext alloc] initWithAttributedString:attributes.attributedString
lineBreakMode:attributes.lineBreakMode
maximumNumberOfLines:attributes.maximumNumberOfLines
exclusionPaths:attributes.exclusionPaths
constrainedSize:shadowConstrainedSize
layoutManagerFactory:attributes.layoutManagerFactory];
_truncater = [[ASTextKitTailTruncater alloc] initWithContext:_context
truncationAttributedString:attributes.truncationAttributedString
avoidTailTruncationSet:attributes.avoidTailTruncationSet ?: _defaultAvoidTruncationCharacterSet()
constrainedSize:shadowConstrainedSize];
[self _calculateSize];
}
return self;
return _context;
}
#pragma mark - Sizing
@@ -74,14 +96,14 @@ static NSCharacterSet *_defaultAvoidTruncationCharacterSet()
{
// Force glyph generation and layout, which may not have happened yet (and isn't triggered by
// -usedRectForTextContainer:).
[_context performBlockWithLockedTextKitComponents:^(NSLayoutManager *layoutManager, NSTextStorage *textStorage, NSTextContainer *textContainer) {
[[self context] performBlockWithLockedTextKitComponents:^(NSLayoutManager *layoutManager, NSTextStorage *textStorage, NSTextContainer *textContainer) {
[layoutManager ensureLayoutForTextContainer:textContainer];
}];
CGRect constrainedRect = {CGPointZero, _constrainedSize};
__block CGRect boundingRect;
[_context performBlockWithLockedTextKitComponents:^(NSLayoutManager *layoutManager, NSTextStorage *textStorage, NSTextContainer *textContainer) {
[[self context] performBlockWithLockedTextKitComponents:^(NSLayoutManager *layoutManager, NSTextStorage *textStorage, NSTextContainer *textContainer) {
boundingRect = [layoutManager usedRectForTextContainer:textContainer];
}];
@@ -94,6 +116,10 @@ static NSCharacterSet *_defaultAvoidTruncationCharacterSet()
- (CGSize)size
{
if (!_sizeIsCalculated) {
[self _calculateSize];
_sizeIsCalculated = YES;
}
return _calculatedSize;
}
@@ -104,13 +130,13 @@ static NSCharacterSet *_defaultAvoidTruncationCharacterSet()
// We add an assertion so we can track the rare conditions where a graphics context is not present
ASDisplayNodeAssertNotNil(context, @"This is no good without a context.");
CGRect shadowInsetBounds = [_shadower insetRectWithConstrainedRect:bounds];
CGRect shadowInsetBounds = [[self shadower] insetRectWithConstrainedRect:bounds];
CGContextSaveGState(context);
[_shadower setShadowInContext:context];
[[self shadower] setShadowInContext:context];
UIGraphicsPushContext(context);
[_context performBlockWithLockedTextKitComponents:^(NSLayoutManager *layoutManager, NSTextStorage *textStorage, NSTextContainer *textContainer) {
[[self context] performBlockWithLockedTextKitComponents:^(NSLayoutManager *layoutManager, NSTextStorage *textStorage, NSTextContainer *textContainer) {
NSRange glyphRange = [layoutManager glyphRangeForTextContainer:textContainer];
[layoutManager drawBackgroundForGlyphRange:glyphRange atPoint:shadowInsetBounds.origin];
[layoutManager drawGlyphsForGlyphRange:glyphRange atPoint:shadowInsetBounds.origin];
@@ -125,7 +151,7 @@ static NSCharacterSet *_defaultAvoidTruncationCharacterSet()
- (NSUInteger)lineCount
{
__block NSUInteger lineCount = 0;
[_context performBlockWithLockedTextKitComponents:^(NSLayoutManager *layoutManager, NSTextStorage *textStorage, NSTextContainer *textContainer) {
[[self context] performBlockWithLockedTextKitComponents:^(NSLayoutManager *layoutManager, NSTextStorage *textStorage, NSTextContainer *textContainer) {
for (NSRange lineRange = { 0, 0 }; NSMaxRange(lineRange) < [layoutManager numberOfGlyphs]; lineCount++) {
[layoutManager lineFragmentRectForGlyphAtIndex:NSMaxRange(lineRange) effectiveRange:&lineRange];
}
@@ -135,7 +161,7 @@ static NSCharacterSet *_defaultAvoidTruncationCharacterSet()
- (std::vector<NSRange>)visibleRanges
{
return _truncater.visibleRanges;
return [self truncater].visibleRanges;
}
@end