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<h1 class="file-heading">File: src/pixi/renderers/canvas/CanvasRenderer.js</h1>
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<pre class="code prettyprint linenums">
/**
* @author Mat Groves http://matgroves.com/ @Doormat23
*/
/**
* the CanvasRenderer draws the stage and all its content onto a 2d canvas. This renderer should be used for browsers that do not support webGL.
* Dont forget to add the view to your DOM or you will not see anything :)
*
* @class CanvasRenderer
* @constructor
* @param width=800 {Number} the width of the canvas view
* @param height=600 {Number} the height of the canvas view
* @param [view] {HTMLCanvasElement} the canvas to use as a view, optional
* @param [transparent=false] {Boolean} the transparency of the render view, default false
*/
PIXI.CanvasRenderer = function(width, height, view, transparent)
{
if(!PIXI.defaultRenderer)
{
PIXI.sayHello("Canvas");
PIXI.defaultRenderer = this;
}
this.type = PIXI.CANVAS_RENDERER;
/**
* This sets if the CanvasRenderer will clear the canvas or not before the new render pass.
* If the Stage is NOT transparent Pixi will use a canvas sized fillRect operation every frame to set the canvas background color.
* If the Stage is transparent Pixi will use clearRect to clear the canvas every frame.
* Disable this by setting this to false. For example if your game has a canvas filling background image you often don't need this set.
*
* @property clearBeforeRender
* @type Boolean
* @default
*/
this.clearBeforeRender = true;
/**
* Whether the render view is transparent
*
* @property transparent
* @type Boolean
*/
this.transparent = !!transparent;
if(!PIXI.blendModesCanvas)
{
PIXI.blendModesCanvas = [];
if(PIXI.canUseNewCanvasBlendModes())
{
PIXI.blendModesCanvas[PIXI.blendModes.NORMAL] = "source-over";
PIXI.blendModesCanvas[PIXI.blendModes.ADD] = "lighter"; //IS THIS OK???
PIXI.blendModesCanvas[PIXI.blendModes.MULTIPLY] = "multiply";
PIXI.blendModesCanvas[PIXI.blendModes.SCREEN] = "screen";
PIXI.blendModesCanvas[PIXI.blendModes.OVERLAY] = "overlay";
PIXI.blendModesCanvas[PIXI.blendModes.DARKEN] = "darken";
PIXI.blendModesCanvas[PIXI.blendModes.LIGHTEN] = "lighten";
PIXI.blendModesCanvas[PIXI.blendModes.COLOR_DODGE] = "color-dodge";
PIXI.blendModesCanvas[PIXI.blendModes.COLOR_BURN] = "color-burn";
PIXI.blendModesCanvas[PIXI.blendModes.HARD_LIGHT] = "hard-light";
PIXI.blendModesCanvas[PIXI.blendModes.SOFT_LIGHT] = "soft-light";
PIXI.blendModesCanvas[PIXI.blendModes.DIFFERENCE] = "difference";
PIXI.blendModesCanvas[PIXI.blendModes.EXCLUSION] = "exclusion";
PIXI.blendModesCanvas[PIXI.blendModes.HUE] = "hue";
PIXI.blendModesCanvas[PIXI.blendModes.SATURATION] = "saturation";
PIXI.blendModesCanvas[PIXI.blendModes.COLOR] = "color";
PIXI.blendModesCanvas[PIXI.blendModes.LUMINOSITY] = "luminosity";
}
else
{
// this means that the browser does not support the cool new blend modes in canvas "cough" ie "cough"
PIXI.blendModesCanvas[PIXI.blendModes.NORMAL] = "source-over";
PIXI.blendModesCanvas[PIXI.blendModes.ADD] = "lighter"; //IS THIS OK???
PIXI.blendModesCanvas[PIXI.blendModes.MULTIPLY] = "source-over";
PIXI.blendModesCanvas[PIXI.blendModes.SCREEN] = "source-over";
PIXI.blendModesCanvas[PIXI.blendModes.OVERLAY] = "source-over";
PIXI.blendModesCanvas[PIXI.blendModes.DARKEN] = "source-over";
PIXI.blendModesCanvas[PIXI.blendModes.LIGHTEN] = "source-over";
PIXI.blendModesCanvas[PIXI.blendModes.COLOR_DODGE] = "source-over";
PIXI.blendModesCanvas[PIXI.blendModes.COLOR_BURN] = "source-over";
PIXI.blendModesCanvas[PIXI.blendModes.HARD_LIGHT] = "source-over";
PIXI.blendModesCanvas[PIXI.blendModes.SOFT_LIGHT] = "source-over";
PIXI.blendModesCanvas[PIXI.blendModes.DIFFERENCE] = "source-over";
PIXI.blendModesCanvas[PIXI.blendModes.EXCLUSION] = "source-over";
PIXI.blendModesCanvas[PIXI.blendModes.HUE] = "source-over";
PIXI.blendModesCanvas[PIXI.blendModes.SATURATION] = "source-over";
PIXI.blendModesCanvas[PIXI.blendModes.COLOR] = "source-over";
PIXI.blendModesCanvas[PIXI.blendModes.LUMINOSITY] = "source-over";
}
}
/**
* The width of the canvas view
*
* @property width
* @type Number
* @default 800
*/
this.width = width || 800;
/**
* The height of the canvas view
*
* @property height
* @type Number
* @default 600
*/
this.height = height || 600;
/**
* The canvas element that everything is drawn to
*
* @property view
* @type HTMLCanvasElement
*/
this.view = view || document.createElement( "canvas" );
/**
* The canvas 2d context that everything is drawn with
* @property context
* @type HTMLCanvasElement 2d Context
*/
this.context = this.view.getContext( "2d", { alpha: this.transparent } );
this.refresh = true;
// hack to enable some hardware acceleration!
//this.view.style["transform"] = "translatez(0)";
this.view.width = this.width;
this.view.height = this.height;
this.count = 0;
/**
* Instance of a PIXI.CanvasMaskManager, handles masking when using the canvas renderer
* @property CanvasMaskManager
* @type CanvasMaskManager
*/
this.maskManager = new PIXI.CanvasMaskManager();
/**
* The render session is just a bunch of parameter used for rendering
* @property renderSession
* @type Object
*/
this.renderSession = {
context: this.context,
maskManager: this.maskManager,
scaleMode: null,
smoothProperty: null,
/**
* If true Pixi will Math.floor() x/y values when rendering, stopping pixel interpolation.
* Handy for crisp pixel art and speed on legacy devices.
*
*/
roundPixels: false
};
if("imageSmoothingEnabled" in this.context)
this.renderSession.smoothProperty = "imageSmoothingEnabled";
else if("webkitImageSmoothingEnabled" in this.context)
this.renderSession.smoothProperty = "webkitImageSmoothingEnabled";
else if("mozImageSmoothingEnabled" in this.context)
this.renderSession.smoothProperty = "mozImageSmoothingEnabled";
else if("oImageSmoothingEnabled" in this.context)
this.renderSession.smoothProperty = "oImageSmoothingEnabled";
};
// constructor
PIXI.CanvasRenderer.prototype.constructor = PIXI.CanvasRenderer;
/**
* Renders the stage to its canvas view
*
* @method render
* @param stage {Stage} the Stage element to be rendered
*/
PIXI.CanvasRenderer.prototype.render = function(stage)
{
// update textures if need be
PIXI.texturesToUpdate.length = 0;
PIXI.texturesToDestroy.length = 0;
stage.updateTransform();
this.context.setTransform(1,0,0,1,0,0);
this.context.globalAlpha = 1;
if (navigator.isCocoonJS && this.view.screencanvas) {
this.context.fillStyle = "black";
this.context.clear();
}
if (!this.transparent && this.clearBeforeRender)
{
this.context.fillStyle = stage.backgroundColorString;
this.context.fillRect(0, 0, this.width, this.height);
}
else if (this.transparent && this.clearBeforeRender)
{
this.context.clearRect(0, 0, this.width, this.height);
}
this.renderDisplayObject(stage);
// run interaction!
if(stage.interactive)
{
//need to add some events!
if(!stage._interactiveEventsAdded)
{
stage._interactiveEventsAdded = true;
stage.interactionManager.setTarget(this);
}
}
// remove frame updates..
if(PIXI.Texture.frameUpdates.length > 0)
{
PIXI.Texture.frameUpdates.length = 0;
}
};
/**
* Resizes the canvas view to the specified width and height
*
* @method resize
* @param width {Number} the new width of the canvas view
* @param height {Number} the new height of the canvas view
*/
PIXI.CanvasRenderer.prototype.resize = function(width, height)
{
this.width = width;
this.height = height;
this.view.width = width;
this.view.height = height;
};
/**
* Renders a display object
*
* @method renderDisplayObject
* @param displayObject {DisplayObject} The displayObject to render
* @param context {Context2D} the context 2d method of the canvas
* @private
*/
PIXI.CanvasRenderer.prototype.renderDisplayObject = function(displayObject, context)
{
// no longer recursive!
//var transform;
//var context = this.context;
this.renderSession.context = context || this.context;
displayObject._renderCanvas(this.renderSession);
};
/**
* Renders a flat strip
*
* @method renderStripFlat
* @param strip {Strip} The Strip to render
* @private
*/
PIXI.CanvasRenderer.prototype.renderStripFlat = function(strip)
{
var context = this.context;
var verticies = strip.verticies;
var length = verticies.length/2;
this.count++;
context.beginPath();
for (var i=1; i < length-2; i++)
{
// draw some triangles!
var index = i*2;
var x0 = verticies[index], x1 = verticies[index+2], x2 = verticies[index+4];
var y0 = verticies[index+1], y1 = verticies[index+3], y2 = verticies[index+5];
context.moveTo(x0, y0);
context.lineTo(x1, y1);
context.lineTo(x2, y2);
}
context.fillStyle = "#FF0000";
context.fill();
context.closePath();
};
/**
* Renders a strip
*
* @method renderStrip
* @param strip {Strip} The Strip to render
* @private
*/
PIXI.CanvasRenderer.prototype.renderStrip = function(strip)
{
var context = this.context;
// draw triangles!!
var verticies = strip.verticies;
var uvs = strip.uvs;
var length = verticies.length/2;
this.count++;
for (var i = 1; i < length-2; i++)
{
// draw some triangles!
var index = i*2;
var x0 = verticies[index], x1 = verticies[index+2], x2 = verticies[index+4];
var y0 = verticies[index+1], y1 = verticies[index+3], y2 = verticies[index+5];
var u0 = uvs[index] * strip.texture.width, u1 = uvs[index+2] * strip.texture.width, u2 = uvs[index+4]* strip.texture.width;
var v0 = uvs[index+1]* strip.texture.height, v1 = uvs[index+3] * strip.texture.height, v2 = uvs[index+5]* strip.texture.height;
context.save();
context.beginPath();
context.moveTo(x0, y0);
context.lineTo(x1, y1);
context.lineTo(x2, y2);
context.closePath();
context.clip();
// Compute matrix transform
var delta = u0*v1 + v0*u2 + u1*v2 - v1*u2 - v0*u1 - u0*v2;
var deltaA = x0*v1 + v0*x2 + x1*v2 - v1*x2 - v0*x1 - x0*v2;
var deltaB = u0*x1 + x0*u2 + u1*x2 - x1*u2 - x0*u1 - u0*x2;
var deltaC = u0*v1*x2 + v0*x1*u2 + x0*u1*v2 - x0*v1*u2 - v0*u1*x2 - u0*x1*v2;
var deltaD = y0*v1 + v0*y2 + y1*v2 - v1*y2 - v0*y1 - y0*v2;
var deltaE = u0*y1 + y0*u2 + u1*y2 - y1*u2 - y0*u1 - u0*y2;
var deltaF = u0*v1*y2 + v0*y1*u2 + y0*u1*v2 - y0*v1*u2 - v0*u1*y2 - u0*y1*v2;
context.transform(deltaA / delta, deltaD / delta,
deltaB / delta, deltaE / delta,
deltaC / delta, deltaF / delta);
context.drawImage(strip.texture.baseTexture.source, 0, 0);
context.restore();
}
};
/**
* Creates a Canvas element of the given size
*
* @method CanvasBuffer
* @param width {Number} the width for the newly created canvas
* @param height {Number} the height for the newly created canvas
* @static
* @private
*/
PIXI.CanvasBuffer = function(width, height)
{
this.width = width;
this.height = height;
this.canvas = document.createElement( "canvas" );
this.context = this.canvas.getContext( "2d" );
this.canvas.width = width;
this.canvas.height = height;
};
/**
* Clears the canvas that was created by the CanvasBuffer class
*
* @method clear
* @private
*/
PIXI.CanvasBuffer.prototype.clear = function()
{
this.context.clearRect(0,0, this.width, this.height);
};
/**
* Resizes the canvas that was created by the CanvasBuffer class to the specified width and height
*
* @method resize
* @param width {Number} the new width of the canvas
* @param height {Number} the new height of the canvas
* @private
*/
PIXI.CanvasBuffer.prototype.resize = function(width, height)
{
this.width = this.canvas.width = width;
this.height = this.canvas.height = height;
};
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