CCTMXLayerCanvasRenderCmd.js

/****************************************************************************
 Copyright (c) 2013-2014 Chukong Technologies Inc.

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(function(){
    cc.TMXLayer.CanvasRenderCmd = function(renderable){
        cc.SpriteBatchNode.CanvasRenderCmd.call(this, renderable);
        this._needDraw = true;
        this._realWorldTransform = {a: 1, b: 0, c: 0, d: 1, tx: 0, ty: 0};

        var locCanvas = cc._canvas;
        var tmpCanvas = cc.newElement('canvas');
        tmpCanvas.width = locCanvas.width;
        tmpCanvas.height = locCanvas.height;
        this._cacheCanvas = tmpCanvas;
        this._cacheContext = new cc.CanvasContextWrapper(this._cacheCanvas.getContext('2d'));
        var tempTexture = new cc.Texture2D();
        tempTexture.initWithElement(tmpCanvas);
        tempTexture.handleLoadedTexture();
        this._cacheTexture = tempTexture;
        // This class uses cache, so its default cachedParent should be himself
        this._cacheDirty = false;
    };

    var proto = cc.TMXLayer.CanvasRenderCmd.prototype = Object.create(cc.SpriteBatchNode.CanvasRenderCmd.prototype);
    proto.constructor = cc.TMXLayer.CanvasRenderCmd;

    //set the cache dirty flag for canvas
    proto._setNodeDirtyForCache = function () {
        this._cacheDirty  = true;
    };

    proto._renderingChildToCache = function () {
        if (this._cacheDirty) {
            var wrapper = this._cacheContext,
                context = wrapper.getContext(), locCanvas = this._cacheCanvas;

            //wrapper.save();
            context.setTransform(1, 0, 0, 1, 0, 0);
            context.clearRect(0, 0, locCanvas.width, locCanvas.height);
            //reset the cache context

            var locChildren = this._node._children;
            for (var i = 0, len =  locChildren.length; i < len; i++) {
                if (locChildren[i]){
                    var selCmd = locChildren[i]._renderCmd;
                    if(selCmd){
                        selCmd.rendering(wrapper, 1, 1);
                        selCmd._cacheDirty = false;
                    }
                }
            }

            //wrapper.restore();
            this._cacheDirty = false;
        }
    };

    proto.rendering = function (ctx, scaleX, scaleY) {
        var alpha = this._displayedOpacity / 255;
        if (alpha <= 0)
            return;

        var node = this._node;
        this._renderingChildToCache();
        var wrapper = ctx || cc._renderContext, context = wrapper.getContext();
        wrapper.setGlobalAlpha(alpha);

        var posX = 0 | ( -this._anchorPointInPoints.x), posY = 0 | ( -this._anchorPointInPoints.y);
        var locCacheCanvas = this._cacheCanvas;
        //direct draw image by canvas drawImage
        if (locCacheCanvas && locCacheCanvas.width !== 0 && locCacheCanvas.height !== 0) {
            wrapper.setTransform(this._realWorldTransform, scaleX, scaleY);
            var locCanvasHeight = locCacheCanvas.height * scaleY;
            if (node.layerOrientation === cc.TMX_ORIENTATION_HEX) {
                var halfTileSize = node._mapTileSize.height * 0.5 * scaleY;
                context.drawImage(locCacheCanvas, 0, 0, locCacheCanvas.width, locCacheCanvas.height,
                    posX, -(posY + locCanvasHeight) + halfTileSize, locCacheCanvas.width * scaleX, locCanvasHeight);
            } else {
                context.drawImage(locCacheCanvas, 0, 0, locCacheCanvas.width, locCacheCanvas.height,
                    posX, -(posY + locCanvasHeight), locCacheCanvas.width * scaleX, locCanvasHeight);
            }
        }
        cc.g_NumberOfDraws++;
    };

    proto._updateCacheContext = function(size, height){
        var node = this._node,
            locContentSize = node._contentSize,
            locCanvas = this._cacheCanvas,
            scaleFactor = cc.contentScaleFactor();
        locCanvas.width = 0 | (locContentSize.width * 1.5 * scaleFactor);
        locCanvas.height = 0 | (locContentSize.height * 1.5 * scaleFactor);

        //todo: need change the wrapper's height
        if(node.layerOrientation === cc.TMX_ORIENTATION_HEX)
            this._cacheContext.setOffset(0, -node._mapTileSize.height * 0.5);                  //translate for hexagonal
        else
            this._cacheContext.setOffset(0, 0);
        var locTexContentSize = this._cacheTexture._contentSize;
        locTexContentSize.width = locCanvas.width;
        locTexContentSize.height = locCanvas.height;
    };

    proto.getTexture = function(){
        return this._cacheTexture;
    };

    proto.visit = function(parentCmd){
        var node = this._node;
        //TODO: it will implement dynamic compute child cutting automation.
        var i, len, locChildren = node._children;
        // quick return if not visible
        if (!node._visible || !locChildren || locChildren.length === 0)
            return;

        parentCmd = parentCmd || this.getParentRenderCmd();
        if (parentCmd)
            this._curLevel = parentCmd._curLevel + 1;

        this._syncStatus(parentCmd);
        if (this._cacheDirty) {
            var wrapper = this._cacheContext, locCanvas = this._cacheCanvas, context = wrapper.getContext(),
                instanceID = node.__instanceId, renderer = cc.renderer;
            //begin cache
            renderer._turnToCacheMode(instanceID);

            node.sortAllChildren();
            for (i = 0, len =  locChildren.length; i < len; i++) {
                if (locChildren[i]){
                    var selCmd = locChildren[i]._renderCmd;
                    if(selCmd){
                        selCmd.visit(this);
                        selCmd._cacheDirty = false;
                    }
                }
            }

            //wrapper.save();
            context.setTransform(1, 0, 0, 1, 0, 0);
            context.clearRect(0, 0, locCanvas.width, locCanvas.height);
            //set the wrapper's offset

            //draw to cache canvas
            renderer._renderingToCacheCanvas(wrapper, instanceID);
            //wrapper.restore();                           //todo: it can be reserve.
            this._cacheDirty = false
        }
        cc.renderer.pushRenderCommand(this);
        this._dirtyFlag = 0;
    };

    proto.transform = function (parentCmd, recursive) {
        // transform for canvas
        var t = this.getNodeToParentTransform(),
            worldT = this._realWorldTransform;         //get the world transform

        if (parentCmd) {
            var pt = parentCmd._worldTransform;
            // cc.AffineTransformConcat is incorrect at get world transform
            worldT.a = t.a * pt.a + t.b * pt.c;                               //a
            worldT.b = t.a * pt.b + t.b * pt.d;                               //b
            worldT.c = t.c * pt.a + t.d * pt.c;                               //c
            worldT.d = t.c * pt.b + t.d * pt.d;                               //d

            var plt = parentCmd._transform;
            var xOffset = -(plt.b + plt.c) * t.ty;
            var yOffset = -(plt.b + plt.c) * t.tx;
            worldT.tx = (t.tx * pt.a + t.ty * pt.c + pt.tx + xOffset);        //tx
            worldT.ty = (t.tx * pt.b + t.ty * pt.d + pt.ty + yOffset);		  //ty
        } else {
            worldT.a = t.a;
            worldT.b = t.b;
            worldT.c = t.c;
            worldT.d = t.d;
            worldT.tx = t.tx;
            worldT.ty = t.ty;
        }
        if (recursive) {
            var locChildren = this._node._children;
            if (!locChildren || locChildren.length === 0)
                return;
            var i, len;
            for (i = 0, len = locChildren.length; i < len; i++) {
                locChildren[i]._renderCmd.transform(this, recursive);
            }
        }
    };

    proto.initImageSize = function(){
        var node = this._node;
        node.tileset.imageSize = this._originalTexture.getContentSizeInPixels();
    };

    proto._reusedTileWithRect = function(rect){
        var node = this._node;
        node._reusedTile = new cc.Sprite();
        node._reusedTile.initWithTexture(node._renderCmd._texture, rect, false);
        node._reusedTile.batchNode = node;
        node._reusedTile.parent = node;
        node._reusedTile._renderCmd._cachedParent = node._renderCmd;
        return node._reusedTile;
    };
})();