int ff_rle_encode(uint8_t *outbuf, int out_size, const uint8_t *ptr , int bpp, int w, int8_t add, uint8_t xor) { int count, x; uint8_t *out; out = outbuf; for(x = 0; x < w; x += count) { /* see if we can encode the next set of pixels with RLE */ if((count = count_pixels(ptr, w-x, bpp, 1)) > 1) { if(out + bpp + 1 > outbuf + out_size) return -1; *out++ = (count ^ xor) + add; memcpy(out, ptr, bpp); out += bpp; } else { /* fall back on uncompressed */ count = count_pixels(ptr, w-x, bpp, 0); *out++ = count - 1; if(out + bpp*count > outbuf + out_size) return -1; memcpy(out, ptr, bpp * count); out += bpp * count; } ptr += count * bpp; } return out - outbuf; }