Alpha only CGContext does not work blend mode

Hi,
I have a Alpha Only CGContext created with
col = 100;
row = 100;
maskBuffer = malloc(100 * 100);
memset(maskBuffer, 255, 100 * 100);
memset(maskBuffer, 0, 100 * 50);
maskContext = CGBitmapContextCreate (maskBuffer, col, row, 8, col, NULL, kCGImageAlphaOnly);
As you can see, the top half is transparent. Then I want to inverse it, make the bottom half transparent. I did
CGContextSetBlendMode(maskContext, kCGBlendModeSourceOut);
CGContextSetFillColorWithColor(maskContext,[UIColor whiteColor].CGColor);
CGRect rect = CGRectMake(0, 0, 100, 100);
CGContextFillRect(maskContext, rect);
I found that the whole context was set transparent. The blend mode kCGBlendModeSourceOut does not seem to work here. Anyone has the same experience?
Thanks,
ff

Seems to me that you need to set the display width to be wide enough for all possible meanings in the LOV, rather than wide enough for the field itself. But I may have misunderstood the question. or misremembered the answer - it has been a while.

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Meaning only field does not work when querying

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Karine

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kodemage wrote:
well, then recovery mode does not work. I've tried all the key combinations I've seen on line. Command+R, Command+Option+R, Command+Option+P+R, none of these work.
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http://tinyurl.com/7ndy8tb
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~~~~~~~~~~~~~
‘iPad is disabled’ fix without resetting using iTunes
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~~~~~~~~~~~~~
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Hello community,
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Data: x_options type ctu_params.
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Alpha only CGContext does not work blend mode

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