Vladimir Grichina vgrichina

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

	// Taken from the commercial iOS PDF framework http://pspdfkit.com.
	// Copyright (c) 2014 Peter Steinberger, PSPDFKit GmbH. All rights reserved.
	// Licensed under MIT (http://opensource.org/licenses/MIT)
	//
	// You should only use this in debug builds. It doesn't use private API, but I wouldn't ship it.

	// PLEASE DUPE rdar://27192338 (https://openradar.appspot.com/27192338) if you would like to see this in UIKit.

	#import <objc/runtime.h>
	#import <objc/message.h>

	#!/usr/sbin/dtrace -s

	/* Run like:
	% sudo csh
	# ./spy.d $PROCESS_ID [$INTERESTING_PROBEPROV]

	Prints a line of dashes every 5 seconds to delineate different experiments.
	*/

	#pragma D option quiet

	//
	// NBResponderChainUtilities.h
	//
	// Created by Nicolas @ bou.io on 19/04/13.
	//

	#import <UIKit/UIKit.h>

	@interface UIView (NBResponderChainUtilities)
	- (UIView*) nb_firstResponder; // Recurse into subviews to find one that responds YES to -isFirstResponder

	;; based on core.logic 0.8-alpha2 or core.logic master branch

	(ns sudoku
	(:refer-clojure :exclude [==])
	(:use clojure.core.logic))

	(defn get-square [rows x y]
	(for [x (range x (+ x 3))
	y (range y (+ y 3))]
	(get-in rows [x y])))

	// Copyright (c) 2012-2013 Peter Steinberger (http://petersteinberger.com)
	//
	// 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
	// furnished to do so, subject to the following conditions:
	//
	// The above copyright notice and this permission notice shall be included in

	# to generate your dhparam.pem file, run in the terminal
	openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048

	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD