#import "SVGKFastImageView.h" #define TEMPORARY_WARNING_FOR_APPLES_BROKEN_RENDERINCONTEXT_METHOD 1 // ONLY needed as temporary workaround for Apple's renderInContext bug breaking various bits of rendering: Gradients, Scaling, etc #if TEMPORARY_WARNING_FOR_APPLES_BROKEN_RENDERINCONTEXT_METHOD #import "SVGGradientElement.h" #endif @interface SVGKFastImageView () @property(nonatomic,readwrite) NSTimeInterval timeIntervalForLastReRenderOfSVGFromMemory; @property (nonatomic, retain) NSDate* startRenderTime, * endRenderTime; /*< for debugging, lets you know how long it took to add/generate the CALayer (may have been cached! Only SVGKImage knows true times) */ @end @implementation SVGKFastImageView { NSString* internalContextPointerBecauseApplesDemandsIt; } @synthesize image = _image; @synthesize tileRatio = _tileRatio; @synthesize disableAutoRedrawAtHighestResolution = _disableAutoRedrawAtHighestResolution; @synthesize timeIntervalForLastReRenderOfSVGFromMemory = _timeIntervalForLastReRenderOfSVGFromMemory; #if TEMPORARY_WARNING_FOR_APPLES_BROKEN_RENDERINCONTEXT_METHOD +(BOOL) svgImageHasNoGradients:(SVGKImage*) image { return [self svgElementAndDescendentsHaveNoGradients:image.DOMTree]; } +(BOOL) svgElementAndDescendentsHaveNoGradients:(SVGElement*) element { if( [element isKindOfClass:[SVGGradientElement class]]) return FALSE; else { for( Node* n in element.childNodes ) { if( [n isKindOfClass:[SVGElement class]]) { if( [self svgElementAndDescendentsHaveNoGradients:(SVGElement*)n]) ; else return FALSE; } } } return TRUE; } #endif - (id)init { NSAssert(false, @"init not supported, use initWithSVGKImage:"); return nil; } - (id)initWithCoder:(NSCoder *)aDecoder { self = [super initWithCoder:aDecoder]; if( self ) { [self populateFromImage:nil]; } return self; } -(id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if( self ) { self.backgroundColor = [UIColor clearColor]; } return self; } - (id)initWithSVGKImage:(SVGKImage*) im { self = [super init]; if (self) { [self populateFromImage:im]; } return self; } - (void)populateFromImage:(SVGKImage*) im { if( im == nil ) { DDLogWarn(@"[%@] WARNING: you have initialized an SVGKImageView with a blank image (nil). Possibly because you're using Storyboards or NIBs which Apple won't allow us to decorate. Make sure you assign an SVGKImage to the .image property!", [self class]); } self.image = im; self.frame = CGRectMake( 0,0, im.size.width, im.size.height ); // NB: this uses the default SVG Viewport; an ImageView can theoretically calc a new viewport (but its hard to get right!) self.tileRatio = CGSizeZero; self.backgroundColor = [UIColor clearColor]; } - (void)setImage:(SVGKImage *)image { #if TEMPORARY_WARNING_FOR_APPLES_BROKEN_RENDERINCONTEXT_METHOD BOOL imageIsGradientFree = [SVGKFastImageView svgImageHasNoGradients:image]; if( !imageIsGradientFree ) NSLog(@"[%@] WARNING: Apple's rendering DOES NOT ALLOW US to render this image correctly using SVGKFastImageView, because Apple's renderInContext method - according to Apple's docs - ignores Apple's own masking layers. Until Apple fixes this bug, you should use SVGKLayeredImageView for this particular SVG file (or avoid using gradients)", [self class]); if( image.scale != 0.0f ) NSLog(@"[%@] WARNING: Apple's rendering DOES NOT ALLOW US to render this image correctly using SVGKFastImageView, because Apple's renderInContext method - according to Apple's docs - ignores Apple's own transforms. Until Apple fixes this bug, you should use SVGKLayeredImageView for this particular SVG file (or avoid using scale: you SHOULD INSTEAD be scaling by setting .size on the image, and ensuring that the incoming SVG has either a viewbox or an explicit svg width or svg height)", [self class]); #endif if( !internalContextPointerBecauseApplesDemandsIt ) { internalContextPointerBecauseApplesDemandsIt = @"Apple wrote the addObserver / KVO notification API wrong in the first place and now requires developers to pass around pointers to fake objects to make up for the API deficicineces. You have to have one of these pointers per object, and they have to be internal and private. They serve no real value."; } if (_image) { [_image removeObserver:self forKeyPath:@"size" context:internalContextPointerBecauseApplesDemandsIt]; } [_image release]; _image = [image retain]; /** redraw-observers */ if( self.disableAutoRedrawAtHighestResolution ) ; else { [self addInternalRedrawOnResizeObservers]; [_image addObserver:self forKeyPath:@"size" options:NSKeyValueObservingOptionNew context:internalContextPointerBecauseApplesDemandsIt]; } /** other obeservers */ [self addObserver:self forKeyPath:@"image" options:NSKeyValueObservingOptionNew context:internalContextPointerBecauseApplesDemandsIt]; [self addObserver:self forKeyPath:@"tileRatio" options:NSKeyValueObservingOptionNew context:internalContextPointerBecauseApplesDemandsIt]; [self addObserver:self forKeyPath:@"showBorder" options:NSKeyValueObservingOptionNew context:internalContextPointerBecauseApplesDemandsIt]; } -(void) addInternalRedrawOnResizeObservers { [self addObserver:self forKeyPath:@"layer" options:NSKeyValueObservingOptionNew context:internalContextPointerBecauseApplesDemandsIt]; [self.layer addObserver:self forKeyPath:@"transform" options:NSKeyValueObservingOptionNew context:internalContextPointerBecauseApplesDemandsIt]; //[self.image addObserver:self forKeyPath:@"size" options:NSKeyValueObservingOptionNew context:internalContextPointerBecauseApplesDemandsIt]; } -(void) removeInternalRedrawOnResizeObservers { [self removeObserver:self forKeyPath:@"layer" context:internalContextPointerBecauseApplesDemandsIt]; [self.layer removeObserver:self forKeyPath:@"transform" context:internalContextPointerBecauseApplesDemandsIt]; //[self.image removeObserver:self forKeyPath:@"size" context:internalContextPointerBecauseApplesDemandsIt]; } -(void)setDisableAutoRedrawAtHighestResolution:(BOOL)newValue { if( newValue == _disableAutoRedrawAtHighestResolution ) return; _disableAutoRedrawAtHighestResolution = newValue; if( self.disableAutoRedrawAtHighestResolution ) // disabled, so we have to remove the observers { [self removeInternalRedrawOnResizeObservers]; } else // newly-enabled ... must add the observers { [self addInternalRedrawOnResizeObservers]; } } - (void)dealloc { if( self.disableAutoRedrawAtHighestResolution ) ; else [self removeInternalRedrawOnResizeObservers]; [self removeObserver:self forKeyPath:@"image" context:internalContextPointerBecauseApplesDemandsIt]; [self removeObserver:self forKeyPath:@"tileRatio" context:internalContextPointerBecauseApplesDemandsIt]; [self removeObserver:self forKeyPath:@"showBorder" context:internalContextPointerBecauseApplesDemandsIt]; if (_image) { [_image removeObserver:self forKeyPath:@"size" context:internalContextPointerBecauseApplesDemandsIt]; } [_image release]; _image = nil; self.startRenderTime = nil; self.endRenderTime = nil; [super dealloc]; } /** Trigger a call to re-display (at higher or lower draw-resolution) (get Apple to call drawRect: again) */ -(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { if( [keyPath isEqualToString:@"transform"] && CGSizeEqualToSize( CGSizeZero, self.tileRatio ) ) { /*DDLogVerbose(@"transform changed. Setting layer scale: %2.2f --> %2.2f", self.layer.contentsScale, self.transform.a); self.layer.contentsScale = self.transform.a;*/ [self.image.CALayerTree removeFromSuperlayer]; // force apple to redraw? [self setNeedsDisplay]; } else { if( self.disableAutoRedrawAtHighestResolution ) ; else { [self setNeedsDisplay]; } } } /** NB: this implementation is a bit tricky, because we're extending Apple's concept of a UIView to add "tiling" and "automatic rescaling" */ -(void)drawRect:(CGRect)rect { self.startRenderTime = self.endRenderTime = [NSDate date]; /** view.bounds == width and height of the view imageBounds == natural width and height of the SVGKImage */ CGRect imageBounds = CGRectMake( 0,0, self.image.size.width, self.image.size.height ); /** Check if tiling is enabled in either direction We have to do this FIRST, because we cannot extend Apple's enum they use for UIViewContentMode (objective-C is a weak language). If we find ANY tiling, we will be forced to skip the UIViewContentMode handling TODO: it would be nice to combine the two - e.g. if contentMode=BottomRight, then do the tiling with the bottom right corners aligned. If = TopLeft, then tile with the top left corners aligned, etc. */ int cols = ceil(self.tileRatio.width); int rows = ceil(self.tileRatio.height); if( cols < 1 ) // It's meaningless to have "fewer than 1" tiles; this lets us ALSO handle special case of "CGSizeZero == disable tiling" cols = 1; if( rows < 1 ) // It's meaningless to have "fewer than 1" tiles; this lets us ALSO handle special case of "CGSizeZero == disable tiling" rows = 1; CGSize scaleConvertImageToView; CGSize tileSize; if( cols == 1 && rows == 1 ) // if we are NOT tiling, then obey the UIViewContentMode as best we can! { #ifdef USE_SUBLAYERS_INSTEAD_OF_BLIT if( self.image.CALayerTree.superlayer == self.layer ) { [super drawRect:rect]; return; // TODO: Apple's bugs - they ignore all attempts to force a redraw } else { [self.layer addSublayer:self.image.CALayerTree]; return; // we've added the layer - let Apple take care of the rest! } #else scaleConvertImageToView = CGSizeMake( self.bounds.size.width / imageBounds.size.width, self.bounds.size.height / imageBounds.size.height ); tileSize = self.bounds.size; #endif } else { scaleConvertImageToView = CGSizeMake( self.bounds.size.width / (self.tileRatio.width * imageBounds.size.width), self.bounds.size.height / ( self.tileRatio.height * imageBounds.size.height) ); tileSize = CGSizeMake( self.bounds.size.width / self.tileRatio.width, self.bounds.size.height / self.tileRatio.height ); } //DEBUG: DDLogVerbose(@"cols, rows: %i, %i ... scaleConvert: %@ ... tilesize: %@", cols, rows, NSStringFromCGSize(scaleConvertImageToView), NSStringFromCGSize(tileSize) ); /** To support tiling, and to allow internal shrinking, we use renderInContext */ CGContextRef context = UIGraphicsGetCurrentContext(); for( int k=0; k