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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.
*/
namespace { // See SkPMFloat.h
static_assert(SK_A32_SHIFT == 24, "This file assumes little-endian.");
inline SkPMFloat::SkPMFloat(SkPMColor c) {
SkPMColorAssert(c);
uint8x8_t fix8 = (uint8x8_t)vdup_n_u32(c);
uint16x8_t fix8_16 = vmovl_u8(fix8);
uint32x4_t fix8_32 = vmovl_u16(vget_low_u16(fix8_16));
fVec = vmulq_f32(vcvtq_f32_u32(fix8_32), vdupq_n_f32(1.0f/255));
SkASSERT(this->isValid());
}
inline SkPMColor SkPMFloat::round() const {
// vcvt_u32_f32 truncates, so we round manually by adding a half before converting.
float32x4_t rounded = vmlaq_f32(vdupq_n_f32(0.5f), fVec, vdupq_n_f32(255));
uint32x4_t fix8_32 = vcvtq_u32_f32(rounded);
uint16x4_t fix8_16 = vqmovn_u32(fix8_32);
uint8x8_t fix8 = vqmovn_u16(vcombine_u16(fix8_16, vdup_n_u16(0)));
SkPMColor c = vget_lane_u32((uint32x2_t)fix8, 0);
SkPMColorAssert(c);
return c;
}
inline Sk4f SkPMFloat::alphas() const {
return vdupq_lane_f32(vget_high_f32(fVec), 1); // Duplicate high lane of high half i.e. lane 3.
}
inline SkPMFloat SkPMFloat::FromOpaqueColor(SkColor c) {
SkASSERT(SkColorGetA(c) == 0xFF);
uint8x8_t fix8 = (uint8x8_t)vdup_n_u32(c);
#if defined(SK_PMCOLOR_IS_RGBA)
fix8 = vtbl1_u8(fix8, vcreate_u8(0x0300010203000102ULL)); // 03 00 01 02, 2x, i.e. swap R&B.
#endif
uint16x8_t fix8_16 = vmovl_u8(fix8);
uint32x4_t fix8_32 = vmovl_u16(vget_low_u16(fix8_16));
SkPMFloat pmf = Sk4f(vmulq_f32(vcvtq_f32_u32(fix8_32), vdupq_n_f32(1.0f/255)));
SkASSERT(pmf.isValid());
return pmf;
}
} // namespace
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