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Jeff Menter jmenter

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I used to code in Objective-C. I still do, but I used to too.

jmenter / gist:9797e4dc0952219d3f875fe2d77f3b1b

Created February 20, 2017 19:42

Fake accelerometer data from iOS Simulator

	- (CMAcceleration)platformSpecificAcceleration;
	{
	CMAcceleration acceleration = self.motionManager.accelerometerData.acceleration;
	#if (TARGET_OS_SIMULATOR)
	acceleration = (CMAcceleration){
	UIDevice.currentDevice.orientation == UIDeviceOrientationLandscapeLeft ? -1.f :
	UIDevice.currentDevice.orientation == UIDeviceOrientationLandscapeRight ? 1.f : 0.f,
	UIDevice.currentDevice.orientation == UIDeviceOrientationPortrait ? -1.f :
	UIDevice.currentDevice.orientation == UIDeviceOrientationPortraitUpsideDown ? 1.f : 0.f, 0.f};
	#endif

jmenter / gist:91e8eed4104bf58e83a1

Created December 22, 2014 20:49

Get CGContextRef from a UIView's CALayer's contents (assuming contents is a CGImageRef)

	CGImageRef image = (__bridge CGImageRef)self.view.layer.contents;
	CGDataProviderRef dataProviderRef = CGImageGetDataProvider(image);
	CFDataRef dataRef = CGDataProviderCopyData(dataProviderRef);
	void dataBytePointer = (void )CFDataGetBytePtr(dataRef);
	CGColorSpaceRef colorSpace = CGImageGetColorSpace(image);
	CGContextRef context = CGBitmapContextCreateWithData(dataBytePointer, CGImageGetWidth(image), CGImageGetHeight(image), CGImageGetBitsPerComponent(image), CGImageGetBytesPerRow(image), colorSpace, CGImageGetBitmapInfo(image), NULL, NULL);
	CGContextDoWhatever(context)...

jmenter / vImageFastBlur.c

Last active June 2, 2023 06:51

C Function to create a blurred CGimageRef (supply an image and a blur radius). Uses vImage Accelerate Framework for Mac OS X/iOS 5+ and is VERY fast.

	// Assumes ARGB8888
	CGImageRef CGImageCreateBlurredImage(CGImageRef inImage, NSUInteger blurRadius)
	{
	if (!inImage) { return NULL; }

	uint32_t radius = (blurRadius % 2) ? (uint32_t)blurRadius : (uint32_t)++blurRadius;
	vImage_Error error;
	vImage_CGImageFormat imageFormat = {(uint32_t)CGImageGetBitsPerComponent(inImage), (uint32_t)CGImageGetBitsPerPixel(inImage), CGImageGetColorSpace(inImage), CGImageGetBitmapInfo(inImage), 0, NULL, kCGRenderingIntentDefault};

	vImage_Buffer source;

jmenter / NSArray+StringUtilities.m

Last active December 21, 2015 14:59

Category on NSArray for concatenating NSStrings.

	@interface NSArray (StringUtilities)
	- (NSString *)string;
	@end

	@implementation NSArray (StringUtilities)
	- (NSString *)string { return [self componentsJoinedByString:@""]; }
	@end

	// Usage Example: NSString *test = @[ @"This", @" is", @" a", @" test." ].string;