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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkPx_neon_DEFINED
#define SkPx_neon_DEFINED
// When we have NEON, we like to work 8 pixels at a time.
// This lets us exploit vld4/vst4 and represent SkPx as planar uint8x8x4_t,
// Wide as planar uint16x8x4_t, and Alpha as a single uint8x8_t plane.
struct SkPx_neon {
static const int N = 8;
uint8x8x4_t fVec;
SkPx_neon(uint8x8x4_t vec) : fVec(vec) {}
static SkPx_neon Dup(uint32_t px) { return vld4_dup_u8((const uint8_t*)&px); }
static SkPx_neon Load(const uint32_t* px) { return vld4_u8((const uint8_t*)px); }
static SkPx_neon Load(const uint32_t* px, int n) {
SkASSERT(0 < n && n < 8);
uint8x8x4_t v = vld4_dup_u8((const uint8_t*)px); // n>=1, so start all lanes with pixel 0.
switch (n) {
case 7: v = vld4_lane_u8((const uint8_t*)(px+6), v, 6); // fall through
case 6: v = vld4_lane_u8((const uint8_t*)(px+5), v, 5); // fall through
case 5: v = vld4_lane_u8((const uint8_t*)(px+4), v, 4); // fall through
case 4: v = vld4_lane_u8((const uint8_t*)(px+3), v, 3); // fall through
case 3: v = vld4_lane_u8((const uint8_t*)(px+2), v, 2); // fall through
case 2: v = vld4_lane_u8((const uint8_t*)(px+1), v, 1);
}
return v;
}
void store(uint32_t* px) const { vst4_u8((uint8_t*)px, fVec); }
void store(uint32_t* px, int n) const {
SkASSERT(0 < n && n < 8);
switch (n) {
case 7: vst4_lane_u8((uint8_t*)(px+6), fVec, 6);
case 6: vst4_lane_u8((uint8_t*)(px+5), fVec, 5);
case 5: vst4_lane_u8((uint8_t*)(px+4), fVec, 4);
case 4: vst4_lane_u8((uint8_t*)(px+3), fVec, 3);
case 3: vst4_lane_u8((uint8_t*)(px+2), fVec, 2);
case 2: vst4_lane_u8((uint8_t*)(px+1), fVec, 1);
case 1: vst4_lane_u8((uint8_t*)(px+0), fVec, 0);
}
}
struct Alpha {
uint8x8_t fA;
Alpha(uint8x8_t a) : fA(a) {}
static Alpha Dup(uint8_t a) { return vdup_n_u8(a); }
static Alpha Load(const uint8_t* a) { return vld1_u8(a); }
static Alpha Load(const uint8_t* a, int n) {
SkASSERT(0 < n && n < 8);
uint8x8_t v = vld1_dup_u8(a); // n>=1, so start all lanes with alpha 0.
switch (n) {
case 7: v = vld1_lane_u8(a+6, v, 6); // fall through
case 6: v = vld1_lane_u8(a+5, v, 5); // fall through
case 5: v = vld1_lane_u8(a+4, v, 4); // fall through
case 4: v = vld1_lane_u8(a+3, v, 3); // fall through
case 3: v = vld1_lane_u8(a+2, v, 2); // fall through
case 2: v = vld1_lane_u8(a+1, v, 1);
}
return v;
}
Alpha inv() const { return vsub_u8(vdup_n_u8(255), fA); }
};
struct Wide {
uint16x8x4_t fVec;
Wide(uint16x8x4_t vec) : fVec(vec) {}
Wide operator+(const Wide& o) const {
return (uint16x8x4_t) {{
vaddq_u16(fVec.val[0], o.fVec.val[0]),
vaddq_u16(fVec.val[1], o.fVec.val[1]),
vaddq_u16(fVec.val[2], o.fVec.val[2]),
vaddq_u16(fVec.val[3], o.fVec.val[3]),
}};
}
Wide operator-(const Wide& o) const {
return (uint16x8x4_t) {{
vsubq_u16(fVec.val[0], o.fVec.val[0]),
vsubq_u16(fVec.val[1], o.fVec.val[1]),
vsubq_u16(fVec.val[2], o.fVec.val[2]),
vsubq_u16(fVec.val[3], o.fVec.val[3]),
}};
}
Wide operator<<(int bits) const {
#if defined(SK_DEBUG)
return (uint16x8x4_t) {{
shift_slow(fVec.val[0], -bits),
shift_slow(fVec.val[1], -bits),
shift_slow(fVec.val[2], -bits),
shift_slow(fVec.val[3], -bits),
}};
#else
return (uint16x8x4_t) {{
vshlq_n_u16(fVec.val[0], bits),
vshlq_n_u16(fVec.val[1], bits),
vshlq_n_u16(fVec.val[2], bits),
vshlq_n_u16(fVec.val[3], bits),
}};
#endif
}
Wide operator>>(int bits) const {
#if defined(SK_DEBUG)
return (uint16x8x4_t) {{
shift_slow(fVec.val[0], bits),
shift_slow(fVec.val[1], bits),
shift_slow(fVec.val[2], bits),
shift_slow(fVec.val[3], bits),
}};
#else
return (uint16x8x4_t) {{
vshrq_n_u16(fVec.val[0], bits),
vshrq_n_u16(fVec.val[1], bits),
vshrq_n_u16(fVec.val[2], bits),
vshrq_n_u16(fVec.val[3], bits),
}};
#endif
}
// v >> bits, for bits in [-15, 16].
static uint16x8_t shift_slow(uint16x8_t v, int bits) {
SkASSERT(bits >= -16 && bits <= 16);
switch (bits) {
#define L(n) case -n: return vshlq_n_u16(v, n);
#define R(n) case n: return vshrq_n_u16(v, n);
L(15) L(14) L(13) L(10) L(9) L(8) L(7) L(6) L(5) L(4) L(3) L(2) L(1)
R(16) R(15) R(14) R(13) R(10) R(9) R(8) R(7) R(6) R(5) R(4) R(3) R(2) R(1)
#undef L
#undef R
}
return v;
}
SkPx_neon addNarrowHi(const SkPx_neon& o) const {
return (uint8x8x4_t) {{
vshrn_n_u16(vaddw_u8(fVec.val[0], o.fVec.val[0]), 8),
vshrn_n_u16(vaddw_u8(fVec.val[1], o.fVec.val[1]), 8),
vshrn_n_u16(vaddw_u8(fVec.val[2], o.fVec.val[2]), 8),
vshrn_n_u16(vaddw_u8(fVec.val[3], o.fVec.val[3]), 8),
}};
}
};
Alpha alpha() const { return fVec.val[3]; }
Wide widenLo() const {
return (uint16x8x4_t) {{
vmovl_u8(fVec.val[0]),
vmovl_u8(fVec.val[1]),
vmovl_u8(fVec.val[2]),
vmovl_u8(fVec.val[3]),
}};
}
// TODO: these two can probably be done faster.
Wide widenHi() const { return this->widenLo() << 8; }
Wide widenLoHi() const { return this->widenLo() + this->widenHi(); }
SkPx_neon operator+(const SkPx_neon& o) const {
return (uint8x8x4_t) {{
vadd_u8(fVec.val[0], o.fVec.val[0]),
vadd_u8(fVec.val[1], o.fVec.val[1]),
vadd_u8(fVec.val[2], o.fVec.val[2]),
vadd_u8(fVec.val[3], o.fVec.val[3]),
}};
}
SkPx_neon operator-(const SkPx_neon& o) const {
return (uint8x8x4_t) {{
vsub_u8(fVec.val[0], o.fVec.val[0]),
vsub_u8(fVec.val[1], o.fVec.val[1]),
vsub_u8(fVec.val[2], o.fVec.val[2]),
vsub_u8(fVec.val[3], o.fVec.val[3]),
}};
}
SkPx_neon saturatedAdd(const SkPx_neon& o) const {
return (uint8x8x4_t) {{
vqadd_u8(fVec.val[0], o.fVec.val[0]),
vqadd_u8(fVec.val[1], o.fVec.val[1]),
vqadd_u8(fVec.val[2], o.fVec.val[2]),
vqadd_u8(fVec.val[3], o.fVec.val[3]),
}};
}
Wide operator*(const Alpha& a) const {
return (uint16x8x4_t) {{
vmull_u8(fVec.val[0], a.fA),
vmull_u8(fVec.val[1], a.fA),
vmull_u8(fVec.val[2], a.fA),
vmull_u8(fVec.val[3], a.fA),
}};
}
SkPx_neon approxMulDiv255(const Alpha& a) const {
return (*this * a).addNarrowHi(*this);
}
SkPx_neon addAlpha(const Alpha& a) const {
return (uint8x8x4_t) {{
fVec.val[0],
fVec.val[1],
fVec.val[2],
vadd_u8(fVec.val[3], a.fA),
}};
}
};
typedef SkPx_neon SkPx;
#endif//SkPx_neon_DEFINED
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