Re: Rasterizing an NSString to a bitmap
Re: Rasterizing an NSString to a bitmap
- Subject: Re: Rasterizing an NSString to a bitmap
- From: p3consulting <email@hidden>
- Date: Tue, 8 Jun 2004 12:01:25 +0200
>
That's the problem right there. You can't make an NSImage draw into a
>
NSBitmapImageRep you provide. You can only get an NSBitmapImageRep
>
out of an NSImage, using the almost but not entirely appropriately
>
named -initWithFocusedViewRect: method.
>
>
Wrong: that's the purpose of NSImage's method:
- (void)addRepresentation:(NSImageRep *)imageRep
Example:
// You need this C function
void setCGContextInCurrentNSGraphicsContext (CGContextRef newContext)
{
((graphicsContextInstance) [NSGraphicsContext
currentContext])->context = newContext;
}
// And here the code creating a NSImage from a drawing done in a
NSBitmapImageRep
// use you own context dependant settings (bitsPerSample, alpha or not,
color space name,...
// and assuming you have NSSize imageSize declared somewhere...
NSBitmapImageRep *bitmapRep = [[NSBitmapImageRep alloc]
initWithBitmapDataPlanes:nil pixelsWide:(int)imageSize.width
pixelsHigh:(int)imageSize.height bitsPerSample:8 samplesPerPixel:4
hasAlpha:YES
isPlanar:NO colorSpaceName:NSDeviceRGBColorSpace bytesPerRow:0
bitsPerPixel:0];
CGContextRef bitmapCGContext = CGBitmapContextCreate ( [bitmapRep
bitmapData],
(int)imageSize.width, (int)imageSize.height,
8,
[bitmapRep bytesPerRow],
CGColorSpaceCreateDeviceRGB(),
kCGImageAlphaPremultipliedLast
);
NSImage *dummy = [[NSImage alloc] initWithSize:imageSize];
[dummy lockFocus] ;
CGContextRef savedCGContext = [[NSGraphicsContext currentContext]
graphicsPort];
setCGContextInCurrentNSGraphicsContext (bitmapCGContext);
// do your drawing here
// using CG... functions or NS... methods
setCGContextInCurrentNSGraphicsContext (savedCGContext);
[dummy unlockFocus] ;
[dummy release] ;
NSImage *resultImage = [[NSImage alloc] initWithSize:imageSize] ;
[resultImage addRepresentation:bitmapRep] ;
// resultImage now contains what you have drawn in the bitmapRep
// you can use it as usual [ibImageView setImage:resultImage] or
whatever...
Pascal Pochet
email@hidden
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