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fix bug in alpha.c that was triggering a memory error in incremental mode

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this change will be superseded by patch #335160 eventually, but until then
let's fix the problem temporarily.

Change-Id: Iafd979c2ff6801e3f1de4614870ca854a4747b04
This commit is contained in:
Pascal Massimino 2016-04-01 00:59:39 -07:00
parent 9a950c5375
commit 8dca0247d2
1 changed files with 24 additions and 23 deletions
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47
src/dec/alpha.c
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@ -131,30 +131,31 @@ const uint8_t* VP8DecompressAlphaRows(VP8Decoder* const dec,
return NULL; // sanity check.
}
if (dec->alph_dec_ == NULL) { // Initialize decoder.
assert(dec->alpha_plane_ != NULL);
dec->alph_dec_ = ALPHNew();
if (dec->alph_dec_ == NULL) return NULL;
if (!ALPHInit(dec->alph_dec_, dec->alpha_data_, dec->alpha_data_size_,
io->width, io->height, dec->alpha_plane_)) {
ALPHDelete(dec->alph_dec_);
dec->alph_dec_ = NULL;
return NULL;
}
// if we allowed use of alpha dithering, check whether it's needed at all
if (dec->alph_dec_->pre_processing_ != ALPHA_PREPROCESSED_LEVELS) {
dec->alpha_dithering_ = 0; // disable dithering
} else {
num_rows = height; // decode everything in one pass
}
}
if (row + num_rows > height) {
num_rows = height - row;
}
if (!dec->is_alpha_decoded_) {
int ok = ALPHDecode(dec, row, num_rows);
int ok;
if (dec->alph_dec_ == NULL) { // Initialize decoder.
assert(dec->alpha_plane_ != NULL);
dec->alph_dec_ = ALPHNew();
if (dec->alph_dec_ == NULL) return NULL;
if (!ALPHInit(dec->alph_dec_, dec->alpha_data_, dec->alpha_data_size_,
io->width, io->height, dec->alpha_plane_)) {
ALPHDelete(dec->alph_dec_);
dec->alph_dec_ = NULL;
return NULL;
}
// if we allowed use of alpha dithering, check whether it's needed at all
if (dec->alph_dec_->pre_processing_ != ALPHA_PREPROCESSED_LEVELS) {
dec->alpha_dithering_ = 0; // disable dithering
} else {
num_rows = height; // decode everything in one pass
}
}
if (row + num_rows > height) {
num_rows = height - row;
}
ok = ALPHDecode(dec, row, num_rows);
assert(dec->alph_dec_ != NULL);
if (!ok || dec->is_alpha_decoded_) {
ALPHDelete(dec->alph_dec_);