Re: Antialising a CGImageRef
Re: Antialising a CGImageRef
- Subject: Re: Antialising a CGImageRef
- From: Chris Meyer <email@hidden>
- Date: Thu, 20 Feb 2003 10:55:10 -0800
Hi Tito,
The CGImageCreate includes a parameter as to whether drawing the image
will interpolate during the operation. You should probably check to
make sure that imageFromPNG is setting this parameter correctly when it
creates the image. If you don't have access to imageFromPNG, you can
check it by calling CGImageGetShouldInterpolate on the image in your
code below.
Chris Meyer
LQ Graphics, Inc.
On Thursday, February 20, 2003, at 06:05 AM, Tito Ciuro wrote:
Hello,
I'm trying to draw a CGImageRef like this:
/********************************************/
NSRect cellFrame = [self bounds];
CGContextRef theRef = (CGContextRef)[[NSGraphicsContext currentContext]
graphicsPort];
// imageFromPNG is defined in a category
CGImageRef iconImage = [NSImage imageFromPNG:@"MyLogo.png"];
CGRect iconRect;
const float iconSize = 32.0;
iconRect = CGRectMake(NSMidX(cellFrame) - (iconSize / 2.0),
NSMidY(cellFrame) - (iconSize / 2.0), iconSize, iconSize);
CGContextSetShouldAntialias(theRef, true);
CGContextDrawImage(theRef, iconRect, iconImage);
CGContextFlush(theRef);
/********************************************/
The code above draws the image in the proper location with the proper
size, but the quality is far from the one we can see in the Dock, for
example. The Dock displays a nice, antialiased image, while the above
code draws it compressing pixels together, resulting in an ugly render.
Any ideas on how this can be improved?
Thanks,
-- Tito
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