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timdown / trim_canvas.js
Created July 26, 2017 16:15
Returns a copy of a canvas element with surrounding transparent space removed
var trimCanvas = (function() {
function rowBlank(imageData, width, y) {
for (var x = 0; x < width; ++x) {
if (imageData.data[y * width * 4 + x * 4 + 3] !== 0) return false;
}
return true;
}
function columnBlank(imageData, width, x, top, bottom) {
for (var y = top; y < bottom; ++y) {
var mediaJSON = { "categories" : [ { "name" : "Movies",
"videos" : [
{ "description" : "Big Buck Bunny tells the story of a giant rabbit with a heart bigger than himself. When one sunny day three rodents rudely harass him, something snaps... and the rabbit ain't no bunny anymore! In the typical cartoon tradition he prepares the nasty rodents a comical revenge.\n\nLicensed under the Creative Commons Attribution license\nhttp://www.bigbuckbunny.org",
"sources" : [ "http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4" ],
"subtitle" : "By Blender Foundation",
"thumb" : "images/BigBuckBunny.jpg",
"title" : "Big Buck Bunny"
},
{ "description" : "The first Blender Open Movie from 2006",
"sources" : [ "http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/ElephantsDream.mp4" ],