C = bsrc[i - 1];
bsrc[i] = (A - B + C + bsrc[i]) & 0xFF;
}
- for (i = 0; i < width; i++) {
+ A = bsrc[-stride];
+ B = bsrc[-(1 + stride + stride - width)];
+ C = bsrc[width - 1];
+ bsrc[stride] = (A - B + C + bsrc[stride]) & 0xFF;
+ for (i = 1; i < width; i++) {
A = bsrc[i - stride];
B = bsrc[i - (1 + stride)];
C = bsrc[i - 1 + stride];
C = bsrc[i - step];
bsrc[i] = (A - B + C + bsrc[i]) & 0xFF;
}
- for (i = 0; i < width * step; i += step) {
+ A = bsrc[-stride];
+ B = bsrc[-(step + stride + stride - width * step)];
+ C = bsrc[width * step - step];
+ bsrc[stride] = (A - B + C + bsrc[stride]) & 0xFF;
+ for (i = step; i < width * step; i += step) {
A = bsrc[i - stride];
B = bsrc[i - (step + stride)];
C = bsrc[i - step + stride];