CPU Memory TOP explnation |CPP

Beginners
1

Hi
i`m not really sure i understand why
every execute cycle this line need to run :

 outputFormat->newCPUPixelDataLocation = 0

[code]float* mem = (float*)outputFormat->cpuPixelData[0];

for (int y = 0; y < outputFormat->height; ++y)
{
    for (int x = 0; x < outputFormat->width; ++x)
    {
        float* pixel = &mem[4*(y*outputFormat->width + x)];

		// RGBA
        pixel[0] = 1;
        pixel[1] = 1;
        pixel[2] = 1;
        pixel[3] = 1;

		if (x < 16 && y == 0) 
		{
			pixel[1] = 1 * speed;
			pixel[2] = 1 * speed;
		}
    }
}

outputFormat->newCPUPixelDataLocation = 0;[/code]