Geek Answers Handbook

Memory leak in CGContextDrawPDFPage in iOS 8.1?

On iOS 8.1, I get a memory leak when rendering a PDF page in a graphical context with CGContextDrawPDFPage. This does not happen in the simulator, but every time I do this, I get hundreds of leaks from 272 bytes of malloc'd memory (on iPad Air). If I comment on CGContextDrawPDFPage, the leak will disappear.

Does anyone have this kind of behavior?

CGDataProviderRef dataProvider = CGDataProviderCreateWithCFData((CFDataRef)data);
CGPDFDocumentRef pdf = CGPDFDocumentCreateWithProvider(dataProvider);


CGPDFPageRef page;

// Grab the PDF page
page = CGPDFDocumentGetPage(pdf, pageNo + 1);

UIGraphicsBeginImageContext(aRect.size);
CGContextRef context = UIGraphicsGetCurrentContext();

CGContextTranslateCTM(context, 0, aRect.size.height);
CGContextScaleCTM(context, 1, -1);

CGContextDrawPDFPage(context, page); // <-  LEAKING?!?!?

// Would create the new UIImage from the context
//image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

CGPDFDocumentRelease(pdf);
CGDataProviderRelease(dataProvider);

Here's the stack trace (reverse):

taNos

38.58 MB 36.7% 148743 std :: __ 1 :: list> :: list (std :: __ 1 :: list> const &)

19.61 MB 18.6% 75610 std :: __ 1 :: vector CG :: Path :: Subpath CG :: Allocator

19.61 MB 18.6% 75610 void std :: __ 1 :: vector> :: __ push_back_slow_path (CG :: Path :: Subpath & &)

19.61 MB 18.6% 75610 CG :: Path :: Sequence :: move_to_point (CGPoint const &, CGAffineTransform const *)

19.61 MB 18.6% 75610 CGPathMoveToPoint

19.59 MB 18.6% 75506 TTrueTypeQuadOutlineContext:: AddPoint (bool, int, int)

19.59 MB 18.6% 75506 TTrueTypeFontHandler:: RenderGlyph (unsigned short, TTrueTypeQuadOutlineContext &, unsigned int) const

19.59 MB 18.6% 75506 TTrueTypeFontHandler:: GetOutlinePath (unsigned short, TGlyphOutlineBatch const &) const

19.59 MB 18.6% 75506 FPFontCopyGlyphPath

19.59 MB 18.6% 75506 CGFontCreateGlyphPath

19.59 MB 18.6% 75506 CGFontCreateGlyphBitmap

19.59 MB 18.6% 75506 CGGlyphBuilder:: create_missing_bitmaps (CGGlyphIdentifier const *, unsigned long, CGGlyphBitmap const **)

19.59 MB 18.6% 75506 render_glyphs

19.59 MB 18.6% 75506 draw_glyph_bitmaps

19.59 MB 18.6% 75506 ripc_DrawGlyphs

19.59 MB 18.6% 75506 draw_glyphs

19.57 MB 18.6% 75434 draw_glyphs

19.55 MB 18.6% 75359 simple_draw

19.55 MB 18.6% 75359 CGPDFTextLayoutDrawGlyphs

19.55 MB 18.6% 75348 op_TJ

19.55 MB 18.6% 75348 pdf_scanner_handle_xname

19.55 MB 18.6% 75348 CGPDFScannerScan

19.55 MB 18.6% 75348 CGPDFDrawingContextDrawPage

19.55 MB 18.6% 75348 pdf_page_draw_in_context

19.55 MB 18.6% 75348 CGContextDrawPDFPage

+4
1

, UIGraphicsEndImageContext() UIGraphicsBeginImageContext().

UIKit:

, UIGraphicsEndImageContext . UIGraphicsPopContext .

0

More articles:


All Articles