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1 #include "SkColorPriv.h" | |
2 #include "SkPMFloat.h" | |
3 #include <arm_neon.h> | |
4 | |
5 // For set(), we widen our 8 bit components (fix8) to 8-bit components in 16 bit
s (fix8_16), | |
6 // then widen those to 8-bit-in-32-bits (fix8_32), convert those to floats (scal
ed), | |
7 // then finally scale those down from [0.0f, 255.0f] to [0.0f, 1.0f] into fColor
. | |
8 | |
9 // get() and clamped() do the opposite, working from [0.0f, 1.0f] floats to [0.0
f, 255.0f], | |
10 // to 8-bit-in-32-bit, to 8-bit-in-16-bit, back down to 8-bit components. | |
11 // clamped() uses vqmovn to clamp while narrowing instead of just narrowing with
vmovn. | |
12 | |
13 inline void SkPMFloat::set(SkPMColor c) { | |
14 SkPMColorAssert(c); | |
15 uint8x8_t fix8 = vdup_n_u32(c); | |
16 uint16x8_t fix8_16 = vmovl_u8(fix8); | |
17 uint32x4_t fix8_32 = vmovl_u16(vget_low_u16(fix8_16)); | |
18 float32x4_t scaled = vcvtq_f32_u32(fix8_32); | |
19 vst1q_f32(fColor, vmulq_f32(scaled, vdupq_n_f32(1.0f/255.0f))); | |
20 SkASSERT(this->isValid()); | |
21 } | |
22 | |
23 inline SkPMColor SkPMFloat::get() const { | |
24 SkASSERT(this->isValid()); | |
25 float32x4_t scaled = vmulq_f32(vld1q_f32(fColor), vdupq_n_f32(255.0f)); | |
26 uint32x4_t fix8_32 = vcvtq_u32_f32(scaled); | |
27 uint16x4_t fix8_16 = vmovn_u32(fix8_32); | |
28 uint8x8_t fix8 = vmovn_u16(vcombine_u16(fix8_16, vdup_n_u16(0))); | |
29 SkPMColor c = vget_lane_u32(fix8, 0); | |
30 SkPMColorAssert(c); | |
31 return c; | |
32 } | |
33 | |
34 inline SkPMColor SkPMFloat::clamped() const { | |
35 float32x4_t scaled = vmulq_f32(vld1q_f32(fColor), vdupq_n_f32(255.0f)); | |
36 uint32x4_t fix8_32 = vcvtq_u32_f32(scaled); | |
37 uint16x4_t fix8_16 = vqmovn_u32(fix8_32); | |
38 uint8x8_t fix8 = vqmovn_u16(vcombine_u16(fix8_16, vdup_n_u16(0))); | |
39 SkPMColor c = vget_lane_u32(fix8, 0); | |
40 SkPMColorAssert(c); | |
41 return c; | |
42 } | |
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