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wasm: Add DC8uv*, VE8uv, and HE8uv functions

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BUG=webp:352

Change-Id: Ia0b2b0d5007c12fff201ac94673312420da42a53
This commit is contained in:
Scott LaVarnway 2017-06-29 17:02:52 -07:00 committed by James Zern
parent a37a7b00d5
commit 440945ca57
1 changed files with 90 additions and 0 deletions
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90
src/dsp/dec_wasm.c
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@ -32,6 +32,12 @@ static WEBP_INLINE uint8x16 get_16_bytes(uint8_t* dst) {
return a;
}
static WEBP_INLINE uint8x16 get_8_bytes(uint8_t* dst) {
uint8x16 a;
memcpy(&a, dst, 8);
return a;
}
static WEBP_INLINE uint8x16 splat_uint8(uint32_t val) {
uint8x16 a;
a[0] = val;
@ -120,6 +126,83 @@ static void DC16NoTopLeft(uint8_t* dst) { // DC with no top and left samples
Put16(0x80, dst);
}
//------------------------------------------------------------------------------
// Chroma
static WEBP_INLINE uint32_t add_horizontal_8(uint8_t* dst) {
const uint8x16 zero = (uint8x16){0};
const uint8x16 a = get_8_bytes(dst);
const uint16x8 _a_lbw = (uint16x8)__builtin_shufflevector(
a, zero, 0, 16, 1, 16, 2, 16, 3, 16, 16, 16, 16, 16, 16, 16, 16, 16);
const uint16x8 _a_hbw = (uint16x8)__builtin_shufflevector(
a, zero, 4, 16, 5, 16, 6, 16, 7, 16, 16, 16, 16, 16, 16, 16, 16, 16);
const uint16x8 sum_a = _a_lbw + _a_hbw;
const uint16x8 sum_b = (uint16x8)__builtin_shufflevector(
sum_a, sum_a, 2, 3, 2, 3, 2, 3, 2, 3);
const uint16x8 sum_c = sum_a + sum_b;
const uint16x8 sum_d = (uint16x8)__builtin_shufflevector(
sum_c, sum_c, 1, 1, 1, 1, 1, 1, 1, 1);
const uint16x8 sum_e = sum_c + sum_d;
return sum_e[0] & 0xffff;
}
static void VE8uv(uint8_t* dst) { // vertical
const uint8x16 top = get_8_bytes(dst - BPS);
int j;
for (j = 0; j < 8; ++j) {
memcpy(dst + j * BPS, &top, 8);
}
}
static void HE8uv(uint8_t* dst) { // horizontal
int j;
for (j = 8; j > 0; --j) {
const uint8x16 values = splat_uint8(dst[-1]);
memcpy(dst, &values, 8);
dst += BPS;
}
}
// helper for chroma-DC predictions
static WEBP_INLINE void Put8x8uv(uint8_t v, uint8_t* dst) {
int j;
const uint8x16 values = splat_uint8(v);
for (j = 0; j < 8; ++j) {
memcpy(dst + j * BPS, &values, 8);
}
}
static void DC8uv(uint8_t* dst) { // DC
int left = 0;
int j;
const uint32_t sum = add_horizontal_8(dst - BPS);
for (j = 0; j < 8; ++j) {
left += dst[-1 + j * BPS];
}
{
const int DC = sum + left + 8;
Put8x8uv(DC >> 4, dst);
}
}
static void DC8uvNoLeft(uint8_t* dst) { // DC with no left samples
const uint32_t DC = 4 + add_horizontal_8(dst - BPS);
Put8x8uv(DC >> 3, dst);
}
static void DC8uvNoTop(uint8_t* dst) { // DC with no top samples
int dc0 = 4;
int i;
for (i = 0; i < 8; ++i) {
dc0 += dst[-1 + i * BPS];
}
Put8x8uv(dc0 >> 3, dst);
}
static void DC8uvNoTopLeft(uint8_t* dst) { // DC with nothing
Put8x8uv(0x80, dst);
}
//------------------------------------------------------------------------------
// Entry point
@ -132,6 +215,13 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitWASM(void) {
VP8PredLuma16[4] = DC16NoTop;
VP8PredLuma16[5] = DC16NoLeft;
VP8PredLuma16[6] = DC16NoTopLeft;
VP8PredChroma8[0] = DC8uv;
VP8PredChroma8[2] = VE8uv;
VP8PredChroma8[3] = HE8uv;
VP8PredChroma8[4] = DC8uvNoTop;
VP8PredChroma8[5] = DC8uvNoLeft;
VP8PredChroma8[6] = DC8uvNoTopLeft;
}
#else // !WEBP_USE_WASM