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138 lines
2.3 KiB
138 lines
2.3 KiB
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/*!
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* Canvas
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* Copyright (c) 2010 LearnBoost <tj@learnboost.com>
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* MIT Licensed
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*/
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/**
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* Module dependencies.
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*/
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var canvas = require('../build/default/canvas')
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, Canvas = canvas.Canvas
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, Image = canvas.Image
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, cairoVersion = canvas.cairoVersion
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, Context2d = require('./context2d')
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, PNGStream = require('./pngstream')
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, fs = require('fs');
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/**
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* Export `Canvas` as the module.
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*/
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var Canvas = exports = module.exports = Canvas;
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/**
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* Library version.
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*/
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exports.version = '0.0.8';
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/**
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* Cairo version.
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*/
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exports.cairoVersion = cairoVersion;
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/**
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* Expose constructors.
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*/
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exports.Context2d = Context2d;
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exports.PNGStream = PNGStream;
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exports.Image = Image;
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/**
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* Context2d implementation.
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*/
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require('./context2d');
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/**
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* Image implementation.
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*/
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require('./image');
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/**
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* Inspect canvas.
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*
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* @return {String}
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* @api public
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*/
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Canvas.prototype.inspect = function(){
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return '[Canvas ' + this.width + ' ' + this.height + ']';
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};
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/**
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* Get a context object.
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*
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* @param {String} contextId
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* @return {Context2d}
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* @api public
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*/
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Canvas.prototype.getContext = function(contextId){
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if ('2d' == contextId) {
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var ctx = new Context2d(this);
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this.context = ctx;
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ctx.canvas = this;
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return ctx;
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}
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};
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/**
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* Create a `PNGStream` for `this` canvas.
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*
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* @return {PNGStream}
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* @api public
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*/
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Canvas.prototype.createPNGStream = function(){
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return new PNGStream(this);
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};
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/**
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* Create a synchronous `PNGStream` for `this` canvas.
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*
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* @return {PNGStream}
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* @api public
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*/
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Canvas.prototype.createSyncPNGStream = function(){
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return new PNGStream(this, true);
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};
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/**
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* Return a data url. Pass a function for async support.
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*
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* @param {String|Function} type
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* @param {Function} fn
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* @return {String}
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* @api public
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*/
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Canvas.prototype.toDataURL = function(type, fn){
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// Default to png
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type = type || 'image/png';
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// Allow callback as first arg
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if ('function' == typeof type) fn = type, type = 'image/png';
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// Throw on non-png
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if ('image/png' != type) throw new Error('currently only image/png is supported');
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var prefix = 'data:' + type + ';base64,';
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if (fn) {
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this.toBuffer(function(err, buf){
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if (err) return fn(err);
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var str = 'data:' + type
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fn(null, prefix + buf.toString('base64'));
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});
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} else {
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return prefix + this.toBuffer().toString('base64');
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}
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};
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