Method blitImage

systemvm/agent/noVNC/core/display.js:394–418

(x, y, width, height, arr, offset, fromQueue)

    }

    blitImage(x, y, width, height, arr, offset, fromQueue) {
        if (this._renderQ.length !== 0 && !fromQueue) {
            // NB(directxman12): it's technically more performant here to use preallocated arrays,
            // but it's a lot of extra work for not a lot of payoff -- if we're using the render queue,
            // this probably isn't getting called *nearly* as much
            const newArr = new Uint8Array(width * height * 4);
            newArr.set(new Uint8Array(arr.buffer, 0, newArr.length));
            this._renderQPush({
                'type': 'blit',
                'data': newArr,
                'x': x,
                'y': y,
                'width': width,
                'height': height,
            });
        } else {
            // NB(directxman12): arr must be an Type Array view
            let data = new Uint8ClampedArray(arr.buffer,
                                             arr.byteOffset + offset,
                                             width * height * 4);
            let img = new ImageData(data, width, height);
            this._drawCtx.putImageData(img, x, y);
            this._damage(x, y, width, height);
        }
    }

    drawImage(img, ...args) {
        this._drawCtx.drawImage(img, ...args);