I'm rendering text into a bitmap image context (in fact just a single letter,
with a small drop-shadow). I am unable to get this text to be drawn
anti-aliased, despite turning on all the shoulds and allows that pertain to
this. Is anti-aliasing supported in a bitmap context on iOS? It seems to render
text to the screen anti-aliased, what' s the difference? Or have I missed
something? Here's the code:
CGColorSpaceRef colourSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate( NULL,
PLAYER_IMAGE_SIZE,
PLAYER_IMAGE_SIZE,
8,
PLAYER_IMAGE_SIZE * 4,
colourSpace,
kCGImageAlphaPremultipliedFirst |
kCGBitmapByteOrderDefault);
CGColorSpaceRelease( colourSpace );
UIGraphicsPushContext( context );
CGContextSetAllowsAntialiasing( context, true );
CGContextSetShouldAntialias( context, true );
CGContextSetInterpolationQuality( context, kCGInterpolationHigh );
UIColor* textColour = [colour shadowWithLevel:0.25];
// category methods on UIColor
UIColor* shadowColour = [colour highlightWithLevel:0.5];
CGContextSetAllowsFontSmoothing( context, true );
CGContextSetShouldSmoothFonts( context, true );
CGContextSetShadowWithColor( context, CGSizeMake( 3, flipped? 3
: -3 ), 4.0, [shadowColour CGColor]);
if( !flipped )
{
CGContextTranslateCTM( context, 0, PLAYER_IMAGE_SIZE );
CGContextScaleCTM( context, 1.0, -1.0 );
}
UIFont* font = [UIFont boldSystemFontOfSize:PLAYER_IMAGE_SIZE *
0.5];
CGSize box = [is sizeWithFont:font];
CGRect isBox;
isBox.size = box;
isBox.origin.x = ( PLAYER_IMAGE_SIZE * 0.5 ) - ( box.width *
0.5 );
isBox.origin.y = ( PLAYER_IMAGE_SIZE * 0.5 ) - ( box.height *
0.5 );
[textColour set];
[is drawInRect:isBox withFont:font
lineBreakMode:UILineBreakModeClip];
CGImageRef image = CGBitmapContextCreateImage( context );
CGContextRelease( context );
UIGraphicsPopContext();
return image;
--Graham
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