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vp9_reconintra: simplify d45_predictor

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only the immediate above right pixel is needed; this removes a
conditional from the inner loop
the final average calculated currently relies on above[] being extended,
it could be reduced to use above[block_size - 2] + 3 * above_right

Change-Id: Ica4f2b8d25eec3ca1d6fa52ef0d4adc228eeea3f
This commit is contained in:
James Zern 2015-05-30 10:21:15 -07:00
parent 6051bcc3dc
commit acc481eaae
1 changed files with 11 additions and 8 deletions
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19
vp9/common/vp9_reconintra.c
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@ -430,14 +430,17 @@ void vp9_d45_predictor_4x4_c(uint8_t *dst, ptrdiff_t stride,
static INLINE void d45_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
const uint8_t *above, const uint8_t *left) {
int r, c;
(void) left;
for (r = 0; r < bs; ++r) {
for (c = 0; c < bs; ++c)
dst[c] = r + c + 2 < bs * 2 ? ROUND_POWER_OF_TWO(above[r + c] +
above[r + c + 1] * 2 +
above[r + c + 2], 2)
: above[bs * 2 - 1];
const uint8_t above_right = above[bs - 1];
int x, size;
uint8_t avg[31]; // TODO(jzern): this could be block size specific
(void)left;
for (x = 0; x < bs - 1; ++x) {
avg[x] = AVG3(above[x], above[x + 1], above[x + 2]);
}
for (x = 0, size = bs - 1; x < bs; ++x, --size) {
memcpy(dst, avg + x, size);
memset(dst + size, above_right, x + 1);
dst += stride;
}
}