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buffer.js.html
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<!DOCTYPE html>
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<meta charset="utf-8">
<title>JSDoc: Source: buffer.js</title>
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<h1 class="page-title">Source: buffer.js</h1>
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<pre class="prettyprint source linenums"><code>"use strict";
/** @module buffer */
var platform = require("./platform");
/**
* Make an invisible {@link canvas}.
* @param {number} width The width of the canvas
* @param {number} height The height of the canvas
* @returns {external:canvas} A canvas DOM element
* @private
*/
function makeCanvas(width, height) {
var c = document.createElement("canvas");
c.width = width;
c.height = height;
// when retina support is enabled, context.getImageData() reads from the wrong pixel causing NinePatch to break
if (platform.isEjecta()) {
c.retinaResolutionEnabled = false;
}
return c;
}
/**
* Make an invisible canvas buffer, and draw on it.
* @param {number} width The width of the buffer
* @param {number} height The height of the buffer
* @param {drawCallback} drawFun The callback that draws on the buffer
* @returns {external:canvas} The drawn buffer
*/
function makeBuffer(width, height, drawFun) {
var canvas = makeCanvas(width, height);
var ctx = canvas.getContext("2d");
// when image smoothing is enabled, the image gets blurred and the pixel data isn't correct even when the image shouldn't be scaled which breaks NinePatch
if (platform.isEjecta()) {
ctx.imageSmoothingEnabled = false;
}
drawFun(ctx);
return canvas;
}
/**
* Make a horizonally-flipped copy of a buffer or image.
* @param {external:canvas|external:image} buffer The original image
* @return {external:canvas} The flipped buffer
*/
function flipBufferHorizontally(buffer) {
return makeBuffer(buffer.width, buffer.height, function(context) {
context.scale(-1, 1);
context.drawImage(buffer, -buffer.width, 0);
});
}
/**
* Make a vertically-flipped copy of a buffer or image.
* @param {external:canvas|external:image} buffer The original image
* @return {external:canvas} The flipped buffer
*/
function flipBufferVertically(buffer) {
return makeBuffer(buffer.width, buffer.height, function(context) {
context.scale(1, -1);
context.drawImage(buffer, 0, -buffer.height);
});
}
/**
* Make a copy of a buffer that is rotated 90 degrees clockwise.
* @param {external:canvas|external:image} buffer The original image
* @return {external:canvas} The rotated buffer
*/
function rotateClockwise(buffer) {
var w = buffer.height;
var h = buffer.width;
var w2 = Math.floor(w / 2);
var h2 = Math.floor(h / 2);
return makeBuffer(w, h, function(context) {
context.translate(w2, h2);
context.rotate(Math.PI / 2);
context.drawImage(buffer, -h2, -w2);
});
}
/**
* Make a copy of a buffer that is rotated 90 degrees counterclockwise.
* @param {external:canvas|external:image} buffer The original image
* @return {external:canvas} The rotated buffer
*/
function rotateCounterclockwise(buffer) {
var w = buffer.height;
var h = buffer.width;
var w2 = Math.floor(w / 2);
var h2 = Math.floor(h / 2);
return makeBuffer(w, h, function(context) {
context.translate(w2, h2);
context.rotate(-Math.PI / 2);
context.drawImage(buffer, -h2, -w2);
});
}
module.exports = {
makeBuffer: makeBuffer,
flipBufferHorizontally: flipBufferHorizontally,
flipBufferVertically: flipBufferVertically,
rotateClockwise: rotateClockwise,
rotateCounterclockwise: rotateCounterclockwise
};
</code></pre>
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<h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-buffer.html">buffer</a></li><li><a href="module-KeyMap.html">KeyMap</a></li></ul><h3>Externals</h3><ul><li><a href="external-AudioContext.html">AudioContext</a></li><li><a href="external-canvas.html">canvas</a></li><li><a href="external-CanvasRenderingContext2D.html">CanvasRenderingContext2D</a></li><li><a href="external-image.html">image</a></li></ul><h3>Classes</h3><ul><li><a href="Accelerometer.html">Accelerometer</a></li><li><a href="Animation.html">Animation</a></li><li><a href="AnimationLoader.html">AnimationLoader</a></li><li><a href="FontLoader.html">FontLoader</a></li><li><a href="ImageLoader.html">ImageLoader</a></li><li><a href="Keyboard.html">Keyboard</a></li><li><a href="Mouse.html">Mouse</a></li><li><a href="SceneManager.html">SceneManager</a></li><li><a href="SoundLoader.html">SoundLoader</a></li><li><a href="Splat.AnimatedEntity.html">AnimatedEntity</a></li><li><a href="Splat.AStar.html">AStar</a></li><li><a href="Splat.BinaryHeap.html">BinaryHeap</a></li><li><a href="Splat.Camera.html">Camera</a></li><li><a href="Splat.Entity.html">Entity</a></li><li><a href="Splat.EntityBoxCamera.html">EntityBoxCamera</a></li><li><a href="Splat.Game.html">Game</a></li><li><a href="Splat.math.Random.html">Random</a></li><li><a href="Splat.NinePatch.html">NinePatch</a></li><li><a href="Splat.Scene.html">Scene</a></li><li><a href="Splat.Timer.html">Timer</a></li></ul><h3>Namespaces</h3><ul><li><a href="Splat.html">Splat</a></li><li><a href="Splat.ads.html">ads</a></li><li><a href="Splat.leaderboards.html">leaderboards</a></li><li><a href="Splat.math.html">math</a></li><li><a href="Splat.saveData.html">saveData</a></li></ul><h3><a href="global.html">Global</a></h3>
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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.3.2</a> on Thu Sep 17 2015 23:22:42 GMT-0400 (EDT)
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