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Merge "fix bug with lossy-alpha output stride"

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This commit is contained in:
Pascal Massimino 2012-05-24 08:56:44 -07:00 committed by Gerrit Code Review
commit 52f5a4eff0
1 changed files with 6 additions and 4 deletions
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10
src/dec/vp8l.c
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@ -945,16 +945,16 @@ static int AllocateARGBBuffers(VP8LDecoder* const dec, int final_width) {
static void ExtractAlphaRows(VP8LDecoder* const dec, int row) {
const int num_rows = row - dec->last_row_;
const int cache_pixs = dec->width_ * num_rows;
const int argb_offset = dec->width_ * dec->last_row_;
const uint32_t* const in = dec->argb_ + argb_offset;
const uint32_t* const in = dec->argb_ + dec->width_ * dec->last_row_;
if (num_rows <= 0) return; // Nothing to be done.
ApplyTransforms(dec, num_rows, in);
// Extract alpha (which is stored in the green plane).
{
uint8_t* const dst = (uint8_t*)dec->io_->opaque + argb_offset;
const int width = dec->io_->width; // the final width (!= dec->width_)
const int cache_pixs = width * num_rows;
uint8_t* const dst = (uint8_t*)dec->io_->opaque + width * dec->last_row_;
const uint32_t* const src = dec->argb_cache_;
int i;
for (i = 0; i < cache_pixs; ++i) dst[i] = (src[i] >> 8) & 0xff;
@ -977,6 +977,8 @@ int VP8LDecodeAlphaImageStream(int width, int height, const uint8_t* const data,
VP8InitIo(&io);
WebPInitCustomIo(NULL, &io); // Just a sanity Init. io won't be used.
io.opaque = output;
io.width = width;
io.height = height;
dec->status_ = VP8_STATUS_OK;
VP8LInitBitReader(&dec->br_, data, data_size);