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wasm: Add simple loopfilter

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BUG=webp:352

Change-Id: If51454b8f54fb14ced91fa703e86e057457f454f
This commit is contained in:
Scott LaVarnway 2017-07-28 09:03:23 -07:00
parent 2371724d79
commit 6fcc3a720d
1 changed files with 69 additions and 0 deletions
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69
src/dsp/dec_wasm.c
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@ -612,6 +612,25 @@ static WEBP_INLINE void NeedsFilter(const int8x16* const p1,
//------------------------------------------------------------------------------
// Edge filtering functions
// Applies filter on 2 pixels (p0 and q0)
static WEBP_INLINE void DoFilter2(int8x16* const p1, int8x16* const p0,
int8x16* const q0, int8x16* const q1,
int thresh) {
int8x16 a, mask;
const int8x16 sign_bit = splat_uint8(0x80);
// convert p1/q1 to int8_t (for GetBaseDelta)
const int8x16 p1s = *p1 ^ sign_bit;
const int8x16 q1s = *q1 ^ sign_bit;
NeedsFilter(p1, p0, q0, q1, thresh, &mask);
FLIP_SIGN_BIT2(*p0, *q0);
GetBaseDelta(&p1s, p0, q0, &q1s, &a);
a = a & mask; // mask filter values we don't care about
DoSimpleFilter(p0, q0, &a);
FLIP_SIGN_BIT2(*p0, *q0);
}
// Applies filter on 4 pixels (p1, p0, q0 and q1)
static WEBP_INLINE void DoFilter4(int8x16* const p1, int8x16* const p0,
int8x16* const q0, int8x16* const q1,
@ -842,6 +861,51 @@ static WEBP_INLINE void Store16x4(const int8x16* const p1,
Store4x4(&q1_s, r8, stride);
}
//------------------------------------------------------------------------------
// Simple In-loop filtering (Paragraph 15.2)
static void SimpleVFilter16(uint8_t* p, int stride, int thresh) {
int8x16 p1, p0, q0, q1;
// Load
memcpy(&p1, &p[-2 * stride], 16);
memcpy(&p0, &p[-stride], 16);
memcpy(&q0, &p[0], 16);
memcpy(&q1, &p[stride], 16);
DoFilter2(&p1, &p0, &q0, &q1, thresh);
// Store
memcpy(&p[-stride], &p0, 16);
memcpy(&p[0], &q0, 16);
}
static void SimpleHFilter16(uint8_t* p, int stride, int thresh) {
int8x16 p1, p0, q0, q1;
p -= 2; // beginning of p1
Load16x4(p, p + 8 * stride, stride, &p1, &p0, &q0, &q1);
DoFilter2(&p1, &p0, &q0, &q1, thresh);
Store16x4(&p1, &p0, &q0, &q1, p, p + 8 * stride, stride);
}
static void SimpleVFilter16i(uint8_t* p, int stride, int thresh) {
int k;
for (k = 3; k > 0; --k) {
p += 4 * stride;
SimpleVFilter16(p, stride, thresh);
}
}
static void SimpleHFilter16i(uint8_t* p, int stride, int thresh) {
int k;
for (k = 3; k > 0; --k) {
p += 4;
SimpleHFilter16(p, stride, thresh);
}
}
//------------------------------------------------------------------------------
// Complex In-loop filtering (Paragraph 15.3)
#define MAX_DIFF1(p3, p2, p1, p0, m) \
@ -1507,6 +1571,11 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitWASM(void) {
VP8VFilter8i = VFilter8i;
VP8HFilter8i = HFilter8i;
VP8SimpleVFilter16 = SimpleVFilter16;
VP8SimpleHFilter16 = SimpleHFilter16;
VP8SimpleVFilter16i = SimpleVFilter16i;
VP8SimpleHFilter16i = SimpleHFilter16i;
VP8PredLuma4[1] = TM4;
VP8PredLuma4[2] = VE4;
VP8PredLuma4[4] = RD4;