CGBitmapContextGetAlphaInfo
INDEX>CoreGraphics> CGBitmapContext
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解説
返り値
引数
参照
サンプル
CGImageAlphaInfo imageAlphaInfo = CGBitmapContextGetAlphaInfo(bitmapContext); //http://developer.apple.com/jp/qa/qa2001/qa1037.html switch (imageAlphaInfo) { case kCGImageAlphaOnly: NSLog(@"kCGImageAlphaOnly"); break; case kCGImageAlphaNone: NSLog(@"kCGImageAlphaNone"); break; case kCGImageAlphaPremultipliedLast: NSLog(@"kCGImageAlphaPremultipliedLast"); break; case kCGImageAlphaPremultipliedFirst: NSLog(@"kCGImageAlphaPremultipliedFirst"); break; case kCGImageAlphaNoneSkipFirst: NSLog(@"kCGImageAlphaNoneSkipFirst"); break; case kCGImageAlphaNoneSkipLast: NSLog(@"kCGImageAlphaNoneSkipLast"); break; case kCGImageAlphaLast: NSLog(@"kCGImageAlphaLast"); break; default: NSLog(@"default"); break; }