CGBitmapContextCreate fails for RGB
Post: #1
Why would CGBitmapContextCreate() fail when I pass an RGB buffer format?
it works when I pass RGBA.
Any idea?
thanks
it works when I pass RGBA.
Any idea?
thanks
Code:
//-----------------------------------------------------------------
RGBA call
size_t rowBytes = 128 * 4;
contextRef = CGBitmapContextCreate( imageRef->buffer,
128,
128,
8,
rowBytes,
colorSpecInfo,
kCGImageAlphaNoneSkipLast );
//-----------------------------------------------------------------
RGB call
size_t rowBytes = 128 * 3;
contextRef = CGBitmapContextCreate( imageRef->buffer,
128,
128,
8,
rowBytes,
colorSpecInfo,
kCGImageAlphaNone );
Post: #2
According to http://developer.apple.com/qa/qa2001/qa1037.html
you can't have 24 bit pixels. Only 8, 16 & 32 bits per pixel. (btw, kCGImageAlphaNone & kCGImageAlphaNoneSkipLast are equivalent)
you can't have 24 bit pixels. Only 8, 16 & 32 bits per pixel. (btw, kCGImageAlphaNone & kCGImageAlphaNoneSkipLast are equivalent)
Post: #3
That's critical info, I wonder why is not part of CG documentation?
thanks PowerMacX.
by the way I donloaded your game entry from 2004 Okugai, good job!.
thanks PowerMacX.
by the way I donloaded your game entry from 2004 Okugai, good job!.
Post: #4
It is part of the CG documentation. Look at the Supported Pixel Formats table in the discussion of CGBitmapContextCreate.
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