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1 /* | |
2 * Copyright 2015 Google Inc. | |
3 * | |
4 * Use of this source code is governed by a BSD-style license that can be | |
5 * found in the LICENSE file. | |
6 */ | |
7 | |
8 namespace { // See SkPMFloat.h | |
9 | |
10 static_assert(SK_A32_SHIFT == 24, "This file assumes little-endian."); | |
11 | |
12 inline SkPMFloat::SkPMFloat(SkPMColor c) { | |
13 SkPMColorAssert(c); | |
14 uint8x8_t fix8 = (uint8x8_t)vdup_n_u32(c); | |
15 uint16x8_t fix8_16 = vmovl_u8(fix8); | |
16 uint32x4_t fix8_32 = vmovl_u16(vget_low_u16(fix8_16)); | |
17 fVec = vmulq_f32(vcvtq_f32_u32(fix8_32), vdupq_n_f32(1.0f/255)); | |
18 SkASSERT(this->isValid()); | |
19 } | |
20 | |
21 inline SkPMColor SkPMFloat::round() const { | |
22 // vcvt_u32_f32 truncates, so we round manually by adding a half before conv
erting. | |
23 float32x4_t rounded = vmlaq_f32(vdupq_n_f32(0.5f), fVec, vdupq_n_f32(255)); | |
24 uint32x4_t fix8_32 = vcvtq_u32_f32(rounded); | |
25 uint16x4_t fix8_16 = vqmovn_u32(fix8_32); | |
26 uint8x8_t fix8 = vqmovn_u16(vcombine_u16(fix8_16, vdup_n_u16(0))); | |
27 SkPMColor c = vget_lane_u32((uint32x2_t)fix8, 0); | |
28 SkPMColorAssert(c); | |
29 return c; | |
30 } | |
31 | |
32 inline Sk4f SkPMFloat::alphas() const { | |
33 return vdupq_lane_f32(vget_high_f32(fVec), 1); // Duplicate high lane of hi
gh half i.e. lane 3. | |
34 } | |
35 | |
36 inline SkPMFloat SkPMFloat::FromOpaqueColor(SkColor c) { | |
37 SkASSERT(SkColorGetA(c) == 0xFF); | |
38 uint8x8_t fix8 = (uint8x8_t)vdup_n_u32(c); | |
39 #if defined(SK_PMCOLOR_IS_RGBA) | |
40 fix8 = vtbl1_u8(fix8, vcreate_u8(0x0300010203000102ULL)); // 03 00 01 02, 2
x, i.e. swap R&B. | |
41 #endif | |
42 uint16x8_t fix8_16 = vmovl_u8(fix8); | |
43 uint32x4_t fix8_32 = vmovl_u16(vget_low_u16(fix8_16)); | |
44 | |
45 SkPMFloat pmf = Sk4f(vmulq_f32(vcvtq_f32_u32(fix8_32), vdupq_n_f32(1.0f/255)
)); | |
46 SkASSERT(pmf.isValid()); | |
47 return pmf; | |
48 } | |
49 | |
50 } // namespace | |
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