gistfile1.txt

// render result back to canvas
                    var data_u32 = new Uint32Array(imageData.data.buffer);
                    var alpha = (0xff << 24);
                    var i = img_u8.cols*img_u8.rows, pix = 0;
                    while(--i >= 0) {
                        pix = img_u8.data[i];
                        data_u32[i] = alpha | (pix << 16) | (pix << 8) | pix;
                    }
                    
                    ctx.putImageData(imageData, 0, 0);