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Intertwined decoding of alpha and RGB

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This will reduce the time to first decoded pixel.

Change-Id: I07b900c0ed4af3aac806b2731e11cd18ec16d016
This commit is contained in:
Urvang Joshi
2013-06-11 16:04:54 -07:00
parent 3fa595a571
commit 068db59e26
11 changed files with 250 additions and 88 deletions
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7
src/dec/frame.c
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@ -201,11 +201,8 @@ static int FinishRow(VP8Decoder* const dec, VP8Io* const io) {
}
io->a = NULL;
if (dec->alpha_data_ != NULL && y_start < y_end) {
// TODO(skal): several things to correct here:
// * testing presence of alpha with dec->alpha_data_ is not a good idea
// * we're actually decompressing the full plane only once. It should be
// more obvious from signature.
// * we could free alpha_data_ right after this call, but we don't own.
// TODO(skal): testing presence of alpha with dec->alpha_data_ is not a
// good idea.
io->a = VP8DecompressAlphaRows(dec, y_start, y_end - y_start);
if (io->a == NULL) {
return VP8SetError(dec, VP8_STATUS_BITSTREAM_ERROR,