dany/libwebp
1
0
Fork 0
mirror of https://github.com/webmproject/libwebp.git synced 2024-12-26 13:48:21 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity

Merge "slightly faster ParseIntraMode"

Browse Source
This commit is contained in:
Pascal Massimino 2013-08-09 02:17:16 -07:00 committed by Gerrit Code Review
commit f486aaa9f8
1 changed files with 9 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
src/dec/tree.c
View File

@ -87,7 +87,6 @@ static const uint8_t kMVProba0[2][NUM_MV_PROBAS] = {
// Paragraph 13.5
static const uint8_t
CoeffsProba0[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS] = {
// genereated using vp8_default_coef_probs() in entropy.c:129
{ { { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
{ 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
{ 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 }
@ -336,20 +335,20 @@ void VP8ResetProba(VP8Proba* const proba) {
#endif
}
void VP8ParseIntraMode(VP8BitReader* const br, VP8Decoder* const dec) {
void VP8ParseIntraMode(VP8BitReader* const br, VP8Decoder* const dec) {
uint8_t* const top = dec->intra_t_ + 4 * dec->mb_x_;
uint8_t* const left = dec->intra_l_;
VP8MBData* const block = dec->mb_data_;
// Hardcoded 16x16 intra-mode decision tree.
block->is_i4x4_ = !VP8GetBit(br, 145); // decide for B_PRED first
if (!block->is_i4x4_) {
// Hardcoded 16x16 intra-mode decision tree.
const int ymode =
VP8GetBit(br, 156) ? (VP8GetBit(br, 128) ? TM_PRED : H_PRED)
: (VP8GetBit(br, 163) ? V_PRED : DC_PRED);
block->imodes_[0] = ymode;
memset(top, ymode, 4 * sizeof(top[0]));
memset(left, ymode, 4 * sizeof(left[0]));
memset(top, ymode, 4 * sizeof(*top));
memset(left, ymode, 4 * sizeof(*left));
} else {
uint8_t* modes = block->imodes_;
int y;
@ -360,10 +359,10 @@ void VP8ParseIntraMode(VP8BitReader* const br, VP8Decoder* const dec) {
const uint8_t* const prob = kBModesProba[top[x]][ymode];
#ifdef USE_GENERIC_TREE
// Generic tree-parsing
int i = 0;
do {
int i = kYModesIntra4[VP8GetBit(br, prob[0])];
while (i > 0) {
i = kYModesIntra4[2 * i + VP8GetBit(br, prob[i])];
} while (i > 0);
}
ymode = -i;
#else
// Hardcoded tree parsing
@ -378,8 +377,9 @@ void VP8ParseIntraMode(VP8BitReader* const br, VP8Decoder* const dec) {
(!VP8GetBit(br, prob[8]) ? B_HD_PRED : B_HU_PRED)));
#endif // USE_GENERIC_TREE
top[x] = ymode;
*modes++ = ymode;
}
memcpy(modes, top, 4 * sizeof(*top));
modes += 4;
left[y] = ymode;
}
}