URL:
<http://savannah.gnu.org/bugs/?func=detailitem&item_id=15837>
Summary: Locking focus on NSImage with Bitmap image rep does
not work
Project: GNUstep
Submitted by: stefanu
Submitted on: Tue 02/21/06 at 09:40
Category: Gui/AppKit
Severity: 3 - Normal
Item Group: Bug
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
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Details:
Following example does not work:
/* Create bitmap image representation */
rep = [[NSBitmapImageRep alloc]
initWithBitmapDataPlanes: nil
pixelsWide: size.width pixelsHigh: size.height
bitsPerSample: 8 samplesPerPixel: 3
hasAlpha: NO isPlanar: NO
colorSpaceName: NSCalibratedRGBColorSpace
bytesPerRow: 0 bitsPerPixel: 24];
image = [[NSImage alloc] initWithSize: size];
[image addRepresentation: rep];
/* Draw image */
[image lockFocusOnRepresentation:rep];
[[NSColor blackColor] set];
[NSBezierPath fillRect:NSMakeRect(10,10,80,80)];
[image unlockFocus];
at this point the NSBitmapImageRepresentation (rep) stays unchanged, as all
changes were made to cached representation created by
lockFocusOnRepresentation: and were not flushed by [image unlockFocus].
I set severity of this problem to "Normal", however I would set it to
"Blocking" as it is blocking to applications wanting to draw inside a bitmap
image. There is no workaround for the problem. Not even if you want
transparent bitmap with incremental changes.
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