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update the Unfilter API in dsp to process one row independently

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This will allow to work in-place on cropped area later.

Also sped up the inverse gradient filtering in SSE2 (~4%)

Change-Id: I463149eee95d36984328f163a1e17f8cabd87441
This commit is contained in:
Pascal Massimino
2016-04-14 19:12:09 +02:00
parent 602f344a36
commit 2102ccd091
8 changed files with 297 additions and 308 deletions
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31
src/dec/alpha.c
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@ -111,17 +111,29 @@ static int ALPHDecode(VP8Decoder* const dec, int row, int num_rows) {
ALPHDecoder* const alph_dec = dec->alph_dec_;
const int width = alph_dec->width_;
const int height = alph_dec->io_.crop_bottom;
uint8_t* const output = dec->alpha_plane_;
if (alph_dec->method_ == ALPHA_NO_COMPRESSION) {
const size_t offset = row * width;
const size_t num_pixels = num_rows * width;
assert(dec->alpha_data_size_ >= ALPHA_HEADER_LEN + offset + num_pixels);
memcpy(dec->alpha_plane_ + offset,
dec->alpha_data_ + ALPHA_HEADER_LEN + offset, num_pixels);
if (WebPUnfilters[alph_dec->filter_] != NULL) {
WebPUnfilters[alph_dec->filter_](width, height, width,
row, num_rows, output);
int y;
const uint8_t* prev_line = dec->alpha_prev_line_;
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;
}
}
dec->alpha_prev_line_ = prev_line;
} else { // alph_dec->method_ == ALPHA_LOSSLESS_COMPRESSION
assert(alph_dec->vp8l_dec_ != NULL);
if (!VP8LDecodeAlphaImageStream(alph_dec, row + num_rows)) {
@ -146,6 +158,7 @@ static int AllocateAlphaPlane(VP8Decoder* const dec, const VP8Io* const io) {
return 0;
}
dec->alpha_plane_ = dec->alpha_plane_mem_;
dec->alpha_prev_line_ = NULL;
return 1;
}