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Fixes size calcution in GlichPosteffect.

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This commit is contained in:
falsycat 2021-08-28 10:45:25 +09:00
parent ec2e28c389
commit 8ef2e66318
1 changed files with 11 additions and 8 deletions
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19
src/GlitchPosteffect.h
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@ -27,16 +27,19 @@ class GlitchPosteffect : public iDrawable {
float* ptr = fb.ptr();
for (int32_t y = 0; y < h; ++y) {
const double shift = (XorShift(seed+y)%100/100.*2-1)*maxShift;
const int32_t s = static_cast<int32_t>(w*shift);
if (std::abs(shift) > 1) continue;
if (XorShift(seed+y)%10 == 0) continue;
const size_t offset = static_cast<size_t>(y) * w;
float* src = ptr + offset;
float* dst = ptr + offset + s;
if (src > dst) std::swap(src, dst);
const double shift = (XorShift(seed+y+h)%100/100.*2-1)*maxShift;
if (std::abs(shift) > 1) continue;
std::memmove(dst, src, static_cast<size_t>(w) - std::abs(s));
const int32_t s = static_cast<int32_t>(w*shift);
const int32_t as = std::abs(s);
float* src = ptr + static_cast<size_t>(y) * w;
float* dst = src + as;
if (s < 0) std::swap(src, dst);
std::memmove(dst, src, (static_cast<size_t>(w) - as)*sizeof(*ptr));
}
}