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Side by Side Diff: src/opts/SkPMFloat_neon.h

Issue 1319413003: Move float<->byte conversions into Sk4f. (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: ranges Created 5 years, 3 months ago
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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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