replace num_parts_ by num_parts_minus_one_ (unsigned)
This avoids spurious warnings and extra calculations.
Change-Id: Ibbe1b893cf89ee6b31a04d7bcbf92b4b357c8628
diff --git a/src/dec/idec.c b/src/dec/idec.c
index 72705a1..8de1319 100644
--- a/src/dec/idec.c
+++ b/src/dec/idec.c
@@ -120,9 +120,9 @@
if (idec->dec_ != NULL) {
if (!idec->is_lossless_) {
VP8Decoder* const dec = (VP8Decoder*)idec->dec_;
- const int last_part = dec->num_parts_ - 1;
+ const uint32_t last_part = dec->num_parts_minus_one_;
if (offset != 0) {
- int p;
+ uint32_t p;
for (p = 0; p <= last_part; ++p) {
VP8RemapBitReader(dec->parts_ + p, offset);
}
@@ -134,7 +134,6 @@
}
{
const uint8_t* const last_start = dec->parts_[last_part].buf_;
- assert(last_part >= 0);
VP8BitReaderSetBuffer(&dec->parts_[last_part], last_start,
mem->buf_ + mem->end_ - last_start);
}
@@ -465,19 +464,20 @@
}
for (; dec->mb_x_ < dec->mb_w_; ++dec->mb_x_) {
VP8BitReader* const token_br =
- &dec->parts_[dec->mb_y_ & (dec->num_parts_ - 1)];
+ &dec->parts_[dec->mb_y_ & dec->num_parts_minus_one_];
MBContext context;
SaveContext(dec, token_br, &context);
if (!VP8DecodeMB(dec, token_br)) {
// We shouldn't fail when MAX_MB data was available
- if (dec->num_parts_ == 1 && MemDataSize(&idec->mem_) > MAX_MB_SIZE) {
+ if (dec->num_parts_minus_one_ == 0 &&
+ MemDataSize(&idec->mem_) > MAX_MB_SIZE) {
return IDecError(idec, VP8_STATUS_BITSTREAM_ERROR);
}
RestoreContext(&context, dec, token_br);
return VP8_STATUS_SUSPENDED;
}
// Release buffer only if there is only one partition
- if (dec->num_parts_ == 1) {
+ if (dec->num_parts_minus_one_ == 0) {
idec->mem_.start_ = token_br->buf_ - idec->mem_.buf_;
assert(idec->mem_.start_ <= idec->mem_.end_);
}
diff --git a/src/dec/vp8.c b/src/dec/vp8.c
index 955c784..336680c 100644
--- a/src/dec/vp8.c
+++ b/src/dec/vp8.c
@@ -50,7 +50,7 @@
SetOk(dec);
WebPGetWorkerInterface()->Init(&dec->worker_);
dec->ready_ = 0;
- dec->num_parts_ = 1;
+ dec->num_parts_minus_one_ = 0;
}
return dec;
}
@@ -194,8 +194,8 @@
size_t last_part;
size_t p;
- dec->num_parts_ = 1 << VP8GetValue(br, 2);
- last_part = dec->num_parts_ - 1;
+ dec->num_parts_minus_one_ = (1 << VP8GetValue(br, 2)) - 1;
+ last_part = dec->num_parts_minus_one_;
if (size < 3 * last_part) {
// we can't even read the sizes with sz[]! That's a failure.
return VP8_STATUS_NOT_ENOUGH_DATA;
@@ -586,7 +586,7 @@
for (dec->mb_y_ = 0; dec->mb_y_ < dec->br_mb_y_; ++dec->mb_y_) {
// Parse bitstream for this row.
VP8BitReader* const token_br =
- &dec->parts_[dec->mb_y_ & (dec->num_parts_ - 1)];
+ &dec->parts_[dec->mb_y_ & dec->num_parts_minus_one_];
if (!VP8ParseIntraModeRow(&dec->br_, dec)) {
return VP8SetError(dec, VP8_STATUS_NOT_ENOUGH_DATA,
"Premature end-of-partition0 encountered.");
diff --git a/src/dec/vp8i.h b/src/dec/vp8i.h
index fed2b27..00da02b 100644
--- a/src/dec/vp8i.h
+++ b/src/dec/vp8i.h
@@ -209,8 +209,8 @@
int tl_mb_x_, tl_mb_y_; // top-left MB that must be in-loop filtered
int br_mb_x_, br_mb_y_; // last bottom-right MB that must be decoded
- // number of partitions.
- int num_parts_;
+ // number of partitions minus one.
+ uint32_t num_parts_minus_one_;
// per-partition boolean decoders.
VP8BitReader parts_[MAX_NUM_PARTITIONS];