PDFKit seems a bit disturbed on Sierra.
The 10.12 beta 3 seems to improve things but there are still some rendering
stutters etc.
Has PDFKit been reworked - there doesn’t seem to be any mention of it in the
release notes?
If so it might be a question of waiting for the internal gremlins to be hunted
down rather than me wasting too much time on this.
Before 10.12 PDFPage -(void)drawWithBox:(PDFDisplayBox)box was called.
In 10.12 PDFPage -(void)drawWithBox:(PDFDisplayBox)box
toContext:(CGContextRef)context was defined.
However, on 10.12.0 when printing NSPrintThumbnailView calls
drawWithBox:(PDFDisplayBox)box inContext:(CGContextRef)context not toContext:.
My only solution here has been to override the private PDFPage
-(void)drawWithBox:(PDFDisplayBox)box inContext:(CGContextRef)context
In addition screen rendering seems to be suffering.
Rendering now has to target the CGContextRef given in PDFPage
drawWithBox:toContext:
I render additional text onto the PDF using NSLayoutManager using a flipped
NSGraphicsContext.
Pre 10.12 this worked fine. Now it is flakey - often I just get a PDFPage rect
filled with red (printing seems okay).
Perhaps I am not handling the context correctly.
It would seem that the actual generation is now called on a background thread
and that [NSGraphicsContext currentContext] can be nil.
I try to deal with this but all is still not quite what it was.
- (void)drawWithBox:(PDFDisplayBox)box inContext:(CGContextRef)context
{
[super drawWithBox:box inContext:context];
BOOL hasInitialNSGraphicsContext = NO;
if ([NSGraphicsContext currentContext]) {
[NSGraphicsContext saveGraphicsState];
hasInitialNSGraphicsContext = YES;
}
else {
CGContextSaveGState(context);
}
// life is much easier if we use a flipped co-ordinate system.
// NSLayoutManager expects a flipped NSGraphicsContext to be present.
NSGraphicsContext *flippedGC = [NSGraphicsContext
graphicsContextWithGraphicsPort:context flipped:YES];
[NSGraphicsContext setCurrentContext:flippedGC];
// define the flip transform
NSAffineTransform* xform = [NSAffineTransform transform];
[xform translateXBy:0.0 yBy:self.mediaBoxRect.size.height];
[xform scaleXBy:1.0 yBy:-1.0];
[xform concat];
// draw all map items
… do my drawing here
if (hasInitialNSGraphicsContext) {
[NSGraphicsContext restoreGraphicsState];
}
else {
CGContextRestoreGState(context);
}
}
Jonathan
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