URL:
<http://savannah.gnu.org/bugs/?38405>
Summary: Drawing doesn't work with [NSGraphicsContext
graphicsContextWithBitmapImageRep:]
Project: GNUstep
Submitted by: vmyrik
Submitted on: Mon 25 Feb 2013 09:58:37 AM GMT
Category: Backend
Severity: 3 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
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Details:
I'm trying to draw some sample image. If I do it using default graphics
context, its ok. But when I switch graphics context to draw directly on
NSBitmapImageRep, it doesn't work - the result is an empty image (but works
fine on Apple).
Here is example of my code:
[NSApplication sharedApplication];
NSRect imgRect = NSMakeRect(0.0, 0.0, 100.0, 100.0);
NSSize imgSize = imgRect.size;
NSBitmapImageRep *offscreenRep = [[[NSBitmapImageRep alloc]
initWithBitmapDataPlanes:NULL
pixelsWide:imgSize.width
pixelsHigh:imgSize.height
bitsPerSample:8
samplesPerPixel:4
hasAlpha:YES
isPlanar:NO
colorSpaceName:NSDeviceRGBColorSpace
bytesPerRow:0
bitsPerPixel:0] autorelease];
NSGraphicsContext *g = [NSGraphicsContext
graphicsContextWithBitmapImageRep:offscreenRep];
NSGraphicsContext saveGraphicsState];
[NSGraphicsContext setCurrentContext:g];
NSBezierPath *path = [NSBezierPath
bezierPathWithRect:NSMakeRect(10,10,50,50)];
[path setLineWidth:3.0];
[[NSColor redColor] set];
[path stroke];
[NSGraphicsContext restoreGraphicsState];
NSData *imageData = [offscreenRep representationUsingType:NSPNGFileType
properties:nil];
[imageData writeToFile:@"result.png" atomically:YES];
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