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<h1 class="file-heading">File: src/pixi/textures/Texture.js</h1>
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<pre class="code prettyprint linenums">
/**
* @author Mat Groves http://matgroves.com/ @Doormat23
*/
PIXI.TextureCache = {};
PIXI.FrameCache = {};
/**
* A texture stores the information that represents an image or part of an image. It cannot be added
* to the display list directly. To do this use PIXI.Sprite. If no frame is provided then the whole image is used
*
* @class Texture
* @uses EventTarget
* @constructor
* @param baseTexture {BaseTexture} The base texture source to create the texture from
* @param frame {Rectangle} The rectangle frame of the texture to show
*/
PIXI.Texture = function(baseTexture, frame)
{
PIXI.EventTarget.call( this );
if(!frame)
{
this.noFrame = true;
frame = new PIXI.Rectangle(0,0,1,1);
}
if(baseTexture instanceof PIXI.Texture)
baseTexture = baseTexture.baseTexture;
/**
* The base texture of this texture
*
* @property baseTexture
* @type BaseTexture
*/
this.baseTexture = baseTexture;
/**
* The frame specifies the region of the base texture that this texture uses
*
* @property frame
* @type Rectangle
*/
this.frame = frame;
/**
* The trim point
*
* @property trim
* @type Point
*/
this.trim = new PIXI.Point();
this.scope = this;
if(baseTexture.hasLoaded)
{
if(this.noFrame)frame = new PIXI.Rectangle(0,0, baseTexture.width, baseTexture.height);
//console.log(frame)
this.setFrame(frame);
}
else
{
var scope = this;
baseTexture.addEventListener( 'loaded', function(){ scope.onBaseTextureLoaded()} );
}
}
PIXI.Texture.prototype.constructor = PIXI.Texture;
/**
* Called when the base texture is loaded
*
* @method onBaseTextureLoaded
* @param event
* @private
*/
PIXI.Texture.prototype.onBaseTextureLoaded = function(event)
{
var baseTexture = this.baseTexture;
baseTexture.removeEventListener( 'loaded', this.onLoaded );
if(this.noFrame)this.frame = new PIXI.Rectangle(0,0, baseTexture.width, baseTexture.height);
this.noFrame = false;
this.width = this.frame.width;
this.height = this.frame.height;
this.scope.dispatchEvent( { type: 'update', content: this } );
}
/**
* Destroys this texture
*
* @method destroy
* @param destroyBase {Boolean} Whether to destroy the base texture as well
*/
PIXI.Texture.prototype.destroy = function(destroyBase)
{
if(destroyBase)this.baseTexture.destroy();
}
/**
* Specifies the rectangle region of the baseTexture
*
* @method setFrame
* @param frame {Rectangle} The frame of the texture to set it to
*/
PIXI.Texture.prototype.setFrame = function(frame)
{
this.frame = frame;
this.width = frame.width;
this.height = frame.height;
if(frame.x + frame.width > this.baseTexture.width || frame.y + frame.height > this.baseTexture.height)
{
throw new Error("Texture Error: frame does not fit inside the base Texture dimensions " + this);
}
this.updateFrame = true;
PIXI.Texture.frameUpdates.push(this);
//this.dispatchEvent( { type: 'update', content: this } );
}
/**
* Helper function that returns a texture based on an image url
* If the image is not in the texture cache it will be created and loaded
*
* @static
* @method fromImage
* @param imageUrl {String} The image url of the texture
* @param crossorigin {Boolean} Whether requests should be treated as crossorigin
* @return Texture
*/
PIXI.Texture.fromImage = function(imageUrl, crossorigin)
{
var texture = PIXI.TextureCache[imageUrl];
if(!texture)
{
texture = new PIXI.Texture(PIXI.BaseTexture.fromImage(imageUrl, crossorigin));
PIXI.TextureCache[imageUrl] = texture;
}
return texture;
}
/**
* Helper function that returns a texture based on a frame id
* If the frame id is not in the texture cache an error will be thrown
*
* @static
* @method fromFrame
* @param frameId {String} The frame id of the texture
* @return Texture
*/
PIXI.Texture.fromFrame = function(frameId)
{
var texture = PIXI.TextureCache[frameId];
if(!texture)throw new Error("The frameId '"+ frameId +"' does not exist in the texture cache " + this);
return texture;
}
/**
* Helper function that returns a texture based on a canvas element
* If the canvas is not in the texture cache it will be created and loaded
*
* @static
* @method fromCanvas
* @param canvas {Canvas} The canvas element source of the texture
* @return Texture
*/
PIXI.Texture.fromCanvas = function(canvas)
{
var baseTexture = new PIXI.BaseTexture(canvas);
return new PIXI.Texture(baseTexture);
}
/**
* Adds a texture to the textureCache.
*
* @static
* @method addTextureToCache
* @param texture {Texture}
* @param id {String} the id that the texture will be stored against.
*/
PIXI.Texture.addTextureToCache = function(texture, id)
{
PIXI.TextureCache[id] = texture;
}
/**
* Remove a texture from the textureCache.
*
* @static
* @method removeTextureFromCache
* @param id {String} the id of the texture to be removed
* @return {Texture} the texture that was removed
*/
PIXI.Texture.removeTextureFromCache = function(id)
{
var texture = PIXI.TextureCache[id]
PIXI.TextureCache[id] = null;
return texture;
}
// this is more for webGL.. it contains updated frames..
PIXI.Texture.frameUpdates = [];
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