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swscale/graph: make noop loop more robust

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The current loop only works if the input and output have the same number
of planes. However, with the new scaling logic, we can also optimize into a
noop the case where the input has extra unneeded planes.

For the memcpy fallback to work in these cases we have to instead check if
the *output* pointer is set, rather than the input pointer.
This commit is contained in:
Niklas Haas
2025-03-06 10:47:21 +01:00
parent 51e912466f
commit bc9696bff8
1 changed files with 3 additions and 1 deletions
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4
libswscale/graph.c
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@ -115,8 +115,10 @@ static void run_copy(const SwsImg *out_base, const SwsImg *in_base,
SwsImg in = shift_img(in_base, y); SwsImg in = shift_img(in_base, y);
SwsImg out = shift_img(out_base, y); SwsImg out = shift_img(out_base, y);
for (int i = 0; i < FF_ARRAY_ELEMS(in.data) && in.data[i]; i++) { for (int i = 0; i < FF_ARRAY_ELEMS(out.data) && out.data[i]; i++) {
const int lines = h >> vshift(in.fmt, i); const int lines = h >> vshift(in.fmt, i);
av_assert1(in.data[i]);
if (in.linesize[i] == out.linesize[i]) { if (in.linesize[i] == out.linesize[i]) {
memcpy(out.data[i], in.data[i], lines * out.linesize[i]); memcpy(out.data[i], in.data[i], lines * out.linesize[i]);
} else { } else {