}
/* calculate deltas */
Y -= Ystride * 4;
- ctx->D[0] = Y[3] - last[3];
- ctx->D[1] = Y[3 + Ystride] - Y[3];
- ctx->D[2] = Y[3 + Ystride * 2] - Y[3 + Ystride];
- ctx->D[3] = Y[3 + Ystride * 3] - Y[3 + Ystride * 2];
+ ctx->D[0] = (unsigned)Y[3] - last[3];
+ ctx->D[1] = (unsigned)Y[3 + Ystride] - Y[3];
+ ctx->D[2] = (unsigned)Y[3 + Ystride * 2] - Y[3 + Ystride];
+ ctx->D[3] = (unsigned)Y[3 + Ystride * 3] - Y[3 + Ystride * 2];
for (i = 0; i < 4; i++)
last[i] = Y[i + Ystride * 3];
}