getPixelColor unpacked

[tablatronix]

A nice helper function for unpacking rgb/w would be nice.

[Luro02]

here is the code that unpacks a uint8_t rgbw value:

uint8_t *unpackColor(uint32_t c)
{
    uint8_t *color = (uint8_t *)calloc(4, sizeof(uint8_t));
    color[0] = (uint8_t)((c >> 16) & 0xFF);
    color[1] = (uint8_t)((c >>  8) & 0xFF);
    color[2] = (uint8_t)((c      ) & 0xFF);
    color[3] = (uint8_t)((c >> 24) & 0xFF);
    return color;
}

this function requires the user to free the returned object and this may not be the most "user-friendly" way of returning rgbw values. I'd suggest creating a rgbw_t type.

typedef struct {
    uint8_t r;
    uint8_t g;
    uint8_t b;
    uint8_t w;
} rgbw_t;

this would allow the user to simply do this

rgbw_t color = unpackColor(color);
printf("(%d, %d, %d, %d)\n", color.r, color.g, color.b, color.w);

[tablatronix]

could also pass in refs args I suppose,
I have been using red(c) green(c) ... wrappers for this