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shave one unneeded filter-cache line

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There was 1 unneeded sample line allocated for the filter cache in of simple filtering.
+ Add an explaining comment.

Change-Id: I775a596c8b8643e773e0eade8aa341dc23fb290f
This commit is contained in:
Pascal Massimino 2011-06-09 12:08:08 -07:00
parent 1955969925
commit 42548da9e3
1 changed files with 6 additions and 2 deletions
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8
src/dec/frame.c
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@ -21,8 +21,12 @@ extern "C" {
//-----------------------------------------------------------------------------
// Memory setup
// how many extra luma lines are needed for caching, given a filtering level
static const uint8_t kFilterExtraRows[3] = { 0, 4, 8 };
// kFilterExtraRows[] = How many extra lines are needed on the MB boundary
// for caching, given a filtering level.
// Simple filter: up to 2 luma samples are read and 1 is written.
// Complex filter: up to 4 luma samples are read and 3 are written. Same for
// U/V, so it's 8 samples total (because of the 2x upsampling).
static const uint8_t kFilterExtraRows[3] = { 0, 2, 8 };
int VP8InitFrame(VP8Decoder* const dec, VP8Io* io) {
const int mb_w = dec->mb_w_;