I've got this category method on NSColor:
+ (NSColor*) patternColorWithData:(unsigned char*)bits
oneColor:(NSColor*)oneColor zeroColor:(NSColor*)zeroColor
{
NSBitmapImageRep* patternBitmap;
patternBitmap = [[[NSBitmapImageRep alloc] initWithBitmapDataPlanes:NULL
pixelsWide:8
pixelsHigh:8
bitsPerSample:8
samplesPerPixel:3
hasAlpha:NO
isPlanar:NO
colorSpaceName:NSDeviceRGBColorSpace
bytesPerRow:0
bitsPerPixel:0]
autorelease];
NSColor* patternColor = nil;
long x, y;
NSColor* theColor;
for ( y = 0; y < 8; y++ )
{
for ( x = 0; x < 8; x++ )
{
NSUInteger bit = ( bits[y] & ( 1 << x ) );
theColor = ( bit ) ? oneColor : zeroColor;
[patternBitmap setColor:theColor atX:x y:y];
}
}
NSImage* patternImage = [[[NSImage alloc] initWithSize:[patternBitmap
size]] autorelease];
[patternImage addRepresentation:patternBitmap];
patternColor = [NSColor colorWithPatternImage:patternImage];
return patternColor;
}
I invoke it by doing:
unsigned char bits[8] = { 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55,
0x55 };
duelPatternColor = [[NSColor patternColorWithData:bits oneColor:[NSColor
blackColor] zeroColor:[NSColor whiteColor]] retain];
However, the patternColor is always solid black and, iI examine the bitmapData
of patternBitmap, it remains just a bunch of zeros.
If I modify the code such that theColor is always [NSColor greenColor], I will
get a solid green color. So, I know the call to setColor is doing something.
So, why can I not use [NSColor whiteColor]?
I'm sure I'm missing something simple, but what that is, I do not know...
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