Re: Creating an NSImage from a bitmap

FROM : Daniel Jalkut
DATE : Thu Aug 10 19:42:27 2006

Hi Craig - you need to help it out a little bit by specifying 
"bytesPerRow" as 2.

Daniel

On Aug 10, 2006, at 12:01 PM, Craig Dooley wrote:

> I am attempting to take a bitmap, and generate a black/transparent
> NSImage from it.  The following example is attempting to draw a 16x16
> square in black, that is transparent in the center.  It does create a
> 16x16 NSImage, which i can display, but only the top line and one
> pixel on the second row are black, and the rest is white.  Is there
> any way to do this, or do i need to translate the data to another
> format first?
>
> unsigned char pattern[] = {
>     0xff, 0xff,
>     0xff, 0xff,
>     0xc0, 0x03,
>     0xc0, 0x03,
>     0xc0, 0x03,
>     0xc0, 0x03,
>     0xc0, 0x03,
>     0xc0, 0x03,
>     0xc0, 0x03,
>     0xc0, 0x03,
>     0xc0, 0x03,
>     0xc0, 0x03,
>     0xc0, 0x03,
>     0xc0, 0x03,
>     0xff, 0xff,
>     0xff, 0xff
> };
>
> unsigned char *planes[] = ;
> glyph = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:planes
>             pixelsWide:16
>             pixelsHigh:16
>             bitsPerSample:1
>             samplesPerPixel:1
>             hasAlpha:NO
>             isPlanar:NO
>             colorSpaceName:NSDeviceBlackColorSpace
>             bytesPerRow:0
>             bitsPerPixel:0];
> image = [[NSImage alloc] init];
> [image addRepresentation:glyph];
>
> -Craig
> --
> ----------------------------------------------------------------------
> -
> Craig Dooley <<email_removed>>
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