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1 /* | 1 /* |
2 * Copyright 2015 Google Inc. | 2 * Copyright 2015 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 namespace { // See Sk4px.h | 8 namespace { // See Sk4px.h |
9 | 9 |
10 inline Sk4px Sk4px::DupPMColor(SkPMColor px) { return Sk16b((uint8x16_t)vdupq_n_
u32(px)); } | 10 inline Sk4px Sk4px::DupPMColor(SkPMColor px) { return Sk16b((uint8x16_t)vdupq_n_
u32(px)); } |
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82 | 82 |
83 inline Sk4px Sk4px::zeroColors() const { | 83 inline Sk4px Sk4px::zeroColors() const { |
84 return Sk16b(vandq_u8(this->fVec, (uint8x16_t)vdupq_n_u32(0xFF << SK_A32_SHI
FT))); | 84 return Sk16b(vandq_u8(this->fVec, (uint8x16_t)vdupq_n_u32(0xFF << SK_A32_SHI
FT))); |
85 } | 85 } |
86 | 86 |
87 inline Sk4px Sk4px::zeroAlphas() const { | 87 inline Sk4px Sk4px::zeroAlphas() const { |
88 // vbic(a,b) == a & ~b | 88 // vbic(a,b) == a & ~b |
89 return Sk16b(vbicq_u8(this->fVec, (uint8x16_t)vdupq_n_u32(0xFF << SK_A32_SHI
FT))); | 89 return Sk16b(vbicq_u8(this->fVec, (uint8x16_t)vdupq_n_u32(0xFF << SK_A32_SHI
FT))); |
90 } | 90 } |
91 | 91 |
92 static inline uint8x16_t widen_to_8888(uint16x4_t v) { | |
93 // RGB565 format: |R....|G.....|B....| | |
94 // Bit: 16 11 5 0 | |
95 | |
96 // First get each pixel into its own 32-bit lane. | |
97 // v == rgb3 rgb2 rgb1 rgb0 | |
98 // spread == 0000 rgb3 0000 rgb2 0000 rgb1 0000 rgb0 | |
99 uint32x4_t spread = vmovl_u16(v); | |
100 | |
101 // Get each color independently, still in 565 precison but down at bit 0. | |
102 auto r5 = vshrq_n_u32(spread, 11), | |
103 g6 = vandq_u32(vdupq_n_u32(63), vshrq_n_u32(spread, 5)), | |
104 b5 = vandq_u32(vdupq_n_u32(31), spread); | |
105 | |
106 // Scale 565 precision up to 8-bit each, filling low 323 bits with high bits
of each component. | |
107 auto r8 = vorrq_u32(vshlq_n_u32(r5, 3), vshrq_n_u32(r5, 2)), | |
108 g8 = vorrq_u32(vshlq_n_u32(g6, 2), vshrq_n_u32(g6, 4)), | |
109 b8 = vorrq_u32(vshrq_n_u32(b5, 3), vshrq_n_u32(b5, 2)); | |
110 | |
111 // Now put all the 8-bit components into SkPMColor order. | |
112 return (uint8x16_t)vorrq_u32(vshlq_n_u32(r8, SK_R32_SHIFT), // TODO: one s
hift is zero... | |
113 vorrq_u32(vshlq_n_u32(g8, SK_G32_SHIFT), | |
114 vorrq_u32(vshlq_n_u32(b8, SK_B32_SHIFT), | |
115 vdupq_n_u32(0xFF << SK_A32_SHIFT)))); | |
116 } | |
117 | |
118 static inline uint16x4_t narrow_to_565(uint8x16_t w8x16) { | |
119 uint32x4_t w = (uint32x4_t)w8x16; | |
120 | |
121 // Extract out top RGB 565 bits of each pixel, with no rounding. | |
122 auto r5 = vandq_u32(vdupq_n_u32(31), vshrq_n_u32(w, SK_R32_SHIFT + 3)), | |
123 g6 = vandq_u32(vdupq_n_u32(63), vshrq_n_u32(w, SK_G32_SHIFT + 2)), | |
124 b5 = vandq_u32(vdupq_n_u32(31), vshrq_n_u32(w, SK_B32_SHIFT + 3)); | |
125 | |
126 // Now put the bits in place in the low 16-bits of each 32-bit lane. | |
127 auto spread = vorrq_u32(vshlq_n_u32(r5, 11), | |
128 vorrq_u32(vshlq_n_u32(g6, 5), | |
129 b5)); | |
130 | |
131 // Pack the low 16-bits of our 128-bit register down into a 64-bit register. | |
132 // spread == 0000 rgb3 0000 rgb2 0000 rgb1 0000 rgb0 | |
133 // v == rgb3 rgb2 rgb1 rgb0 | |
134 auto v = vmovn_u32(spread); | |
135 return v; | |
136 } | |
137 | |
138 | |
139 inline Sk4px Sk4px::Load4(const SkPMColor16 src[4]) { | |
140 return Sk16b(widen_to_8888(vld1_u16(src))); | |
141 } | |
142 inline Sk4px Sk4px::Load2(const SkPMColor16 src[2]) { | |
143 auto src2 = ((uint32_t)src[0] ) | |
144 | ((uint32_t)src[1] << 16); | |
145 return Sk16b(widen_to_8888(vcreate_u16(src2))); | |
146 } | |
147 inline Sk4px Sk4px::Load1(const SkPMColor16 src[1]) { | |
148 return Sk16b(widen_to_8888(vcreate_u16(src[0]))); | |
149 } | |
150 | |
151 inline void Sk4px::store4(SkPMColor16 dst[4]) const { | |
152 vst1_u16(dst, narrow_to_565(this->fVec)); | |
153 } | |
154 inline void Sk4px::store2(SkPMColor16 dst[2]) const { | |
155 auto v = narrow_to_565(this->fVec); | |
156 dst[0] = vget_lane_u16(v, 0); | |
157 dst[1] = vget_lane_u16(v, 1); | |
158 } | |
159 inline void Sk4px::store1(SkPMColor16 dst[1]) const { | |
160 dst[0] = vget_lane_u16(narrow_to_565(this->fVec), 0); | |
161 } | |
162 | |
163 } // namespace | 92 } // namespace |
164 | 93 |
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