Arduino Sketch to send animated diagonal spectrum to Rainbowduino and 8x8 RGB LED matrix

gistfile1.c

#include <Rainbowduino.h>

byte display[] = {
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0
};

char vel[] = {
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0
};

unsigned char RED[64] = {
  255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,238,221,204,188,171,154,137,119,102,85,
  68,51,34,17,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,17,35,52};

unsigned char GREEN[64] = {
  0,17,34,51,68,85,102,119,136,153,170,187,204,221,238,255,255,255,255,255,255,255,255,255,255,255,255,
  255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,238,221,204,188,170,154,136,120,102,86,68,52,34,18,0,0,0,0};

unsigned char BLUE[64] = {
  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,18,34,52,68,86,102,120,136,154,170,188,
  204,221,238,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255};

void setup() {
  Rb.init();

  for (unsigned char c = 0; c < 64; c++) {
    display[c] = (c % 8) + (c / 8) & B01111111;
    vel[c] = 1;
  }
}

void loop() {
   for (unsigned char x = 0; x < 8; x++) {
     for (unsigned char y = 0; y < 8; y++) {
        unsigned char ofs = (y << 3) + x;
        unsigned char hue = display[ofs];
        uint32_t colour = ((uint32_t)RED[hue] << 16) | ((uint32_t)GREEN[hue] << 8) | BLUE[hue];
        Rb.setPixelXY(x, y, colour);
        hue = hue+vel[ofs];
        if (hue < 0 || hue > 63) {
          vel[ofs] = -vel[ofs];
          hue += vel[ofs];
        }
        display[ofs] = hue;
     }
   }
  delay(25);
}