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Re: BitMap data format and autorelease
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Re: BitMap data format and autorelease


  • Subject: Re: BitMap data format and autorelease
  • From: Trygve Inda <email@hidden>
  • Date: Wed, 12 Mar 2008 19:01:13 +0000
  • Thread-topic: BitMap data format and autorelease

> Then you definitely want to create your own NSBitmapImageRep — the
> init method will give you total control over the pixel format. Then
> you can lockFocus and draw whatever you want into it.

So I have created this:

imageRep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:NULL
                                     pixelsWide:width
                                     pixelsHigh:height
                                     bitsPerSample:8
                                     samplesPerPixel:4
                                     hasAlpha:YES
                                     isPlanar:NO
                                     colorSpaceName:NSDeviceRGBColorSpace
                                     bitmapFormat:NSAlphaFirstBitmapFormat
                                     bytesPerRow:width * 4
                                     bitsPerPixel:32];

baseAddr = [imageRep bitmapData];


So I have a pixel buffer... Now I need to:

(1) draw an NSImage into this bitmap... Without making a copy of the data
because after the image is drawn on my bitmap I will do a bunch of direct
pixel manipulation on it (from baseAddr), then I need to

(2) draw some semi-opaque text over the bitmap and finally

(3) save it as a new jpg.

Any help is appreciated... I am coming from a Gworld/QuickDraw background so
this is all a lot to absorb!

Thanks,

Trygve


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 >Re: BitMap data format and autorelease (From: Jens Alfke <email@hidden>)

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