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perform two idct transforms at a time when possible

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patch by Christian Duvivier (cduvivier at google dot com)
This commit is contained in:
Pascal Massimino
2011-06-20 00:22:37 -07:00
parent 01af7b69cd
commit 96ed9ce0fb
4 changed files with 62 additions and 21 deletions
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4
src/dec/frame.c
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@ -379,7 +379,7 @@ void VP8ReconstructBlock(VP8Decoder* const dec) {
uint8_t* const dst = y_dst + kScan[n];
VP8PredLuma4[dec->imodes_[n]](dst);
if (dec->non_zero_ac_ & (1 << n)) {
VP8Transform(coeffs + n * 16, dst);
VP8Transform(coeffs + n * 16, dst, 0);
} else if (dec->non_zero_ & (1 << n)) { // only DC is present
VP8TransformDC(coeffs + n * 16, dst);
}
@ -391,7 +391,7 @@ void VP8ReconstructBlock(VP8Decoder* const dec) {
for (n = 0; n < 16; n++) {
uint8_t* const dst = y_dst + kScan[n];
if (dec->non_zero_ac_ & (1 << n)) {
VP8Transform(coeffs + n * 16, dst);
VP8Transform(coeffs + n * 16, dst, 0);
} else if (dec->non_zero_ & (1 << n)) { // only DC is present
VP8TransformDC(coeffs + n * 16, dst);
}