dragonbones-runtime/.cache/egret-core-5.1.0/src/egret/display/RenderTexture.ts

the tools to build dragonbones file for diffrent framework

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namespace egret {

    /**
     * RenderTexture is a dynamic texture
     * @extends egret.Texture
     * @version Egret 2.4
     * @platform Web,Native
     * @includeExample egret/display/RenderTexture.ts
     * @language en_US
     */
    /**
     * RenderTexture 是动态纹理类，他实现了将显示对象及其子对象绘制成为一个纹理的功能
     * @extends egret.Texture
     * @version Egret 2.4
     * @platform Web,Native
     * @includeExample egret/display/RenderTexture.ts
     * @language zh_CN
     */
    export class RenderTexture extends egret.Texture {

        constructor() {
            super();
            this.$renderBuffer = new sys.RenderBuffer();
            let bitmapData = new egret.BitmapData(this.$renderBuffer.surface);
            bitmapData.$deleteSource = false;
            this._setBitmapData(bitmapData);
        }

        public $renderBuffer:sys.RenderBuffer;
        /**
         * The specified display object is drawn as a texture
         * @param displayObject {egret.DisplayObject} the display to draw
         * @param clipBounds {egret.Rectangle} clip rect
         * @param scale {number} scale factor
         * @version Egret 2.4
         * @platform Web,Native
         * @language en_US
         */
        /**
         * 将指定显示对象绘制为一个纹理
         * @param displayObject {egret.DisplayObject} 需要绘制的显示对象
         * @param clipBounds {egret.Rectangle} 绘制矩形区域
         * @param scale {number} 缩放比例
         * @version Egret 2.4
         * @platform Web,Native
         * @language zh_CN
         */
        public drawToTexture(displayObject:egret.DisplayObject, clipBounds?:Rectangle, scale:number = 1):boolean {
            if (clipBounds && (clipBounds.width == 0 || clipBounds.height == 0)) {
                return false;
            }

            let bounds = clipBounds || displayObject.$getOriginalBounds();
            if (bounds.width == 0 || bounds.height == 0) {
                return false;
            }

            scale /= $TextureScaleFactor;
            let width = (bounds.x + bounds.width) * scale;
            let height = (bounds.y + bounds.height) * scale;
            if (clipBounds) {
                width = bounds.width * scale;
                height = bounds.height * scale;
            }

            let renderBuffer = this.$renderBuffer;
            if (!renderBuffer) {
                return false;
            }
            renderBuffer.resize(width, height);
            this.$bitmapData.width = width;
            this.$bitmapData.height = height;

            let matrix = Matrix.create();
            matrix.identity();
            //应用裁切
            if (clipBounds) {
                matrix.translate(-clipBounds.x, -clipBounds.y);
            }
            matrix.scale(scale, scale);
            sys.systemRenderer.render(displayObject, renderBuffer, matrix, true);
            Matrix.release(matrix);

            //设置纹理参数
            this.$initData(0, 0, width, height, 0, 0, width, height, width, height);
            
            return true;
        }

        /**
         * @inheritDoc
         */
        public getPixel32(x:number, y:number):number[] {
            let data:number[];
            if (this.$renderBuffer) {
                let scale = $TextureScaleFactor;
                x = Math.round(x / scale);
                y = Math.round(y / scale);
                data = this.$renderBuffer.getPixels(x, y, 1, 1);
            }
            return data;
        }

        /**
         * @inheritDoc
         */
        public dispose():void {
            super.dispose();
            this.$renderBuffer = null;
        }
    }
}