dany/libwebp
1
0
Fork 0
mirror of https://github.com/webmproject/libwebp.git synced 2024-12-27 06:08:21 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity

remove unused parameter 'round' from CalcProba()

Browse Source 
Change-Id: I0d89c34565decb28776aee7500ebd261fc43caf7
This commit is contained in:
Pascal Massimino 2012-04-24 06:40:19 -07:00
parent 231ec1fb6d
commit 9630e16854
1 changed files with 6 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
src/utils/tcoder.c
View File

@ -246,11 +246,10 @@ static void ExchangeSymbol(const TCoder* const c, const int pos) {
// ----------------------------------------------------------------------------- // -----------------------------------------------------------------------------
// probability computation // probability computation
static WEBP_INLINE int CalcProba(Count_t num, Count_t total, static WEBP_INLINE int CalcProba(Count_t num, Count_t total, int max_proba) {
int max_proba, int round) {
int p; int p;
assert(total > 0); assert(total > 0);
p = (num * max_proba + round) / total; p = num * max_proba / total;
assert(p >= 0 && p <= MAX_PROBA); assert(p >= 0 && p <= MAX_PROBA);
return MAX_PROBA - p; return MAX_PROBA - p;
} }
@ -259,13 +258,13 @@ static WEBP_INLINE void UpdateNodeProbas(TCoder* const c, int pos) {
Node* const node = &c->nodes_[pos]; Node* const node = &c->nodes_[pos];
const Count_t total = TotalCount(node); const Count_t total = TotalCount(node);
if (total < COUNTER_CUT_OFF) if (total < COUNTER_CUT_OFF)
node->probaS_ = CalcProba(node->countS_, total, MAX_PROBA, 0); node->probaS_ = CalcProba(node->countS_, total, MAX_PROBA);
if (!IsLeaf(c, pos)) { if (!IsLeaf(c, pos)) {
const Count_t total_count = node->count_; const Count_t total_count = node->count_;
if (total_count < COUNTER_CUT_OFF) { if (total_count < COUNTER_CUT_OFF) {
const Count_t left_count = TotalCount(&c->nodes_[2 * pos]); const Count_t left_count = TotalCount(&c->nodes_[2 * pos]);
node->probaL_ = node->probaL_ =
MAX_PROBA - CalcProba(left_count, total_count, MAX_PROBA, 0); MAX_PROBA - CalcProba(left_count, total_count, MAX_PROBA);
} }
} }
} }
@ -353,7 +352,7 @@ void TCoderEncode(TCoder* const c, int s, VP8BitWriter* const bw) {
if (c->num_symbols_ > 0) { if (c->num_symbols_ > 0) {
if (bw != NULL) { if (bw != NULL) {
const int new_symbol_proba = const int new_symbol_proba =
CalcProba(c->num_symbols_, c->total_coded_, HALF_PROBA - 1, 0); CalcProba(c->num_symbols_, c->total_coded_, HALF_PROBA - 1);
VP8PutBit(bw, is_new_symbol, new_symbol_proba); VP8PutBit(bw, is_new_symbol, new_symbol_proba);
} }
} else { } else {
@ -413,7 +412,7 @@ int TCoderDecode(TCoder* const c, VP8BitReader* const br) {
if (!c->fixed_symbols_ && c->num_symbols_ < c->num_nodes_) { if (!c->fixed_symbols_ && c->num_symbols_ < c->num_nodes_) {
if (c->num_symbols_ > 0) { if (c->num_symbols_ > 0) {
const int new_symbol_proba = const int new_symbol_proba =
CalcProba(c->num_symbols_, c->total_coded_, HALF_PROBA - 1, 0); CalcProba(c->num_symbols_, c->total_coded_, HALF_PROBA - 1);
is_new_symbol = VP8GetBit(br, new_symbol_proba); is_new_symbol = VP8GetBit(br, new_symbol_proba);
} else { } else {
is_new_symbol = 1; is_new_symbol = 1;