*/
for (y = 0; y < synth_height; y++) {
for (x = 0; x < synth_width; x++)
- synthl[x] = datal[x] << 1;
+ synthl[x] = datal[x] * 2;
synthl += synth_width;
datal += stride;
}
/* Horizontal synthesis. */
for (y = 0; y < synth_height; y++) {
for (x = 0; x < synth_width; x += 2) {
- synthl[y*synth_width + x + 1] = (datal[y*stride + x + 1] << s) -
- (datal[y*stride + x] << s);
- synthl[y*synth_width + x] = (datal[y*stride + x + 0] << s) +
+ synthl[y*synth_width + x + 1] = (datal[y*stride + x + 1] - datal[y*stride + x]) * (1 << s);
+ synthl[y*synth_width + x] = datal[y*stride + x + 0] * (1 << s) +
((synthl[y*synth_width + x + 1] + 1) >> 1);
}
}