Nathan Henderson nathos

Screencasting Framework

The following document is a written account of the Code School screencasting framework. It should be used as a reference of the accompanying screencast on the topic.

Why you should care about screencasting?

You're probably aren't going to take the time to read this document if you're not interested, but there are a lot of nice side effects caused by learning how to create quality screencasts.

Communicating more effectively - At Envy Labs we produce screencasts for our clients all the time. Whether it's demoing a new feature or for a presentation for an invester, they're often much more effective and pleasent than a phone call or screen sharing.

Git Compression of Blobs and Packfiles.

Many users of Git are curious about the lack of delta compression at the object (blob) level when commits are first written. This efficiency is saved until the pack file is written. Loose objects are written in compressed, but non-delta format at the time of each commit.

A simple run though of a commit sequence with only the smallest change to the image (in uncompressed TIFF format to amplify the observable behavior) aids the understanding of this deferred and different approach efficiency.

The command sequence:

Create the repo:

	[merge]
	keepBackup = false
	tool = p4merge
	[mergetool "p4merge"]
	cmd = /Applications/p4merge.app/Contents/Resources/launchp4merge "\"$PWD/$BASE\"" "\"$PWD/$REMOTE\"" "\"$PWD/$LOCAL\"" "\"$PWD/$MERGED\""
	keepTemporaries = false
	trustExitCode = false
	keepBackup = false
	[diff]
	tool = p4merge

	@mixin row() {
	margin-left: $gridGutterWidth * -1;
	@media (max-width: 767px) { margin-left: 0; }
	@media (min-width: 768px) and (max-width: 979px) { margin-left: $gridGutterWidth768 * -1; }
	@media (min-width: 1200px) { margin-left: $gridGutterWidth1200 * -1; }
	@include clearfix();
	}

	@mixin column($columns: 1, $offset: 0) {
	float: left;

	$(function() {
	var isTransitionSupported = (function (pseudo, transProp, transPropStart, transPropEnd) {
	var id = pseudo + transProp + '-' + (new Date()).valueOf(),
	prefixes = ['o', 'ms', 'moz', 'webkit'],
	prop = "transition: " + transProp + " 99s linear;",
	allprops = (function () {
	var props = "";
	for (var l = prefixes.length; l--;) {
	props += "-" + prefixes[l] + "-" + prop;
	}

	/* Server side check if there is a cookie that defines
	devicePixelRatio, if not, serve this javascript */

	//Does it support it? no, default to 1;
	if (window.devicePixelRatio === undefined) {
	window.devicePixelRatio = 1;
	}

	//Setup cookie date.
	var now = new Date();

	@media only screen and (min-width: 320px) {

	/* Small screen, non-retina */

	}

	@media
	only screen and (-webkit-min-device-pixel-ratio: 2) and (min-width: 320px),
	only screen and ( min--moz-device-pixel-ratio: 2) and (min-width: 320px),
	only screen and ( -o-min-device-pixel-ratio: 2/1) and (min-width: 320px),

	#!/bin/sh

	###
	# SOME COMMANDS WILL NOT WORK ON macOS (Sierra or newer)
	# For Sierra or newer, see https://github.com/mathiasbynens/dotfiles/blob/master/.macos
	###

	# Alot of these configs have been taken from the various places
	# on the web, most from here
	# https://github.com/mathiasbynens/dotfiles/blob/5b3c8418ed42d93af2e647dc9d122f25cc034871/.osx

	#!/usr/bin/env ruby
	require 'rubygems'
	require 'nokogiri'
	require 'open-uri'

	url = ARGV[0]

	class Document < Nokogiri::XML::SAX::Document
	SEMANTIC_CONTAINERS = %w(body article section nav aside hgroup header footer)
	COUNT_ELEMENTS = %w(p a)

	Highcharts.Chart.prototype.callbacks.push(function(chart) {
	var hasTouch = hasTouch = document.documentElement.ontouchstart !== undefined,
	mouseTracker = chart.tracker,
	container = chart.container,
	mouseMove;

	mouseMove = function (e) {
	// let the system handle multitouch operations like two finger scroll
	// and pinching
	if (e && e.touches && e.touches.length > 1) {