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treat FILTER_NONE as a regular Unfilter[] call

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Removes the hard-coded memcpy() in alpha-decoding.

Change-Id: I1dfd98db206893d7715a79d05a1bd9272690471a
This commit is contained in:
skal
2023-06-07 15:38:07 +02:00
parent f6499943c4
commit 6b02f66015
2 changed files with 14 additions and 16 deletions
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21
src/dec/alpha_dec.c
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@ -117,21 +117,12 @@ static int ALPHDecode(VP8Decoder* const dec, int row, int num_rows) {
const uint8_t* deltas = dec->alpha_data_ + ALPHA_HEADER_LEN + row * width;
uint8_t* dst = dec->alpha_plane_ + row * width;
assert(deltas <= &dec->alpha_data_[dec->alpha_data_size_]);
if (alph_dec->filter_ != WEBP_FILTER_NONE) {
assert(WebPUnfilters[alph_dec->filter_] != NULL);
for (y = 0; y < num_rows; ++y) {
WebPUnfilters[alph_dec->filter_](prev_line, deltas, dst, width);
prev_line = dst;
dst += width;
deltas += width;
}
} else {
for (y = 0; y < num_rows; ++y) {
memcpy(dst, deltas, width * sizeof(*dst));
prev_line = dst;
dst += width;
deltas += width;
}
assert(WebPUnfilters[alph_dec->filter_] != NULL);
for (y = 0; y < num_rows; ++y) {
WebPUnfilters[alph_dec->filter_](prev_line, deltas, dst, width);
prev_line = dst;
dst += width;
deltas += width;
}
dec->alpha_prev_line_ = prev_line;
} else { // alph_dec->method_ == ALPHA_LOSSLESS_COMPRESSION