randomsequence’s gists

randomsequence / MPS.swift

Last active June 12, 2020 11:38

Use BlitCommandEncoder to sync destination

	import MetalPerformanceShaders

	struct Pixel {
	var red: UInt8
	var green: UInt8
	var blue: UInt8
	var alpha: UInt8
	}

	let count = 64

randomsequence / Cubic Bezier Curve Flattening using Forward Differencing

Last active May 10, 2019 13:00 — forked from rlindsay/Cubic Bezier Curve Flattening using Forward Differencing

Skip that last point, like we promised

	/*
	The MIT License (MIT)

	Copyright (c) 2014-2015 Russel Lindsay

	Permission is hereby granted, free of charge, to any person obtaining a copy
	of this software and associated documentation files (the "Software"), to deal
	in the Software without restriction, including without limitation the rights
	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	copies of the Software, and to permit persons to whom the Software is

randomsequence / ConcurrentAccessors.m

Last active June 15, 2018 16:06

	#import <Foundation/Foundation.h>
	#include <pthread.h>

	@interface Getty : NSObject {
	@protected
	id _object;
	}
	@property (nonatomic, strong, readonly) id object;
	@end

randomsequence / CompareImages.swift

Last active October 2, 2024 21:09 — forked from ralfebert/CompareImages.swift

A couple of swift functions for comparing two CGImage using CIImage in OS X

	//
	// Thanks Kevin!
	// https://gist.github.com/SheffieldKevin/566dc048dd6f36716bcd
	//

	import CoreGraphics
	import CoreImage

	extension CGImage {

randomsequence / keybase.md

Created January 23, 2018 15:15

I hereby claim:

To claim this, I am signing this object:

randomsequence / pixels.swift

Created November 22, 2017 07:26

Poking at Pixels in Swift 4

	import Cocoa

	struct Pixel {
	var alpha: UInt8
	var red: UInt8
	var green: UInt8
	var blue: UInt8

	init(red: UInt8, green: UInt8, blue: UInt8, alpha: UInt8) {
	self.alpha = alpha

randomsequence / quartz-drawing.swift

Created March 30, 2016 19:47

Drawing to NSImage using Quartz in Swift

	import Cocoa

	// helper function which takes a size and a drawing function.
	// returns an image

	public func drawItems(bounds: CGRect, block: (bounds: CGRect, context: CGContextRef) -> () ) -> NSImage? {
	var outputImage: NSImage? = nil
	let insetSize = CGSizeMake(-20, -20)
	let insetBounds = CGRectInset(bounds, insetSize.width, insetSize.height)
	let colorSpace = CGColorSpaceCreateDeviceRGB()

randomsequence / cocoa-drawing.swift

Created July 14, 2015 15:25

Drawing images with CGContext and NSGraphicsContext in Swift

	//: Playground - noun: a place where people can play

	import Cocoa

	let bounds = CGRectMake(0, 0, 100, 100);

	func DrawImageInCGContext(#size: CGSize, #drawFunc: (context: CGContextRef) -> ()) -> NSImage {
	let colorSpace = CGColorSpaceCreateDeviceRGB()
	let bitmapInfo = CGBitmapInfo(CGImageAlphaInfo.PremultipliedLast.rawValue)
	let context = CGBitmapContextCreate(

randomsequence / CIContext+IntermediateImage.m

Created May 12, 2014 12:20

CoreImage - Render a CIImage to an Intermediate CVPixelBuffer Backed Image

	@implementation CIContext (IntermediateImage)

	- (CIImage )rsq_renderToIntermediateImage:(CIImage )image {
	CIImage *intermediateImage = nil;
	CGSize size = image.extent.size;
	CVPixelBufferRef pixelBuffer = NULL;
	CVReturn status = CVPixelBufferCreate(kCFAllocatorDefault,
	size.width,
	size.height,
	kCVPixelFormatType_32ARGB,

randomsequence / UIImage+Scramble.m

Created April 24, 2014 13:57

UIImage - Mirror every other row & every other column. This produces an image with the same histogram as the source.

Johnnie Walker randomsequence