| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkHalf.h" |
| #include "SkPM4fPriv.h" |
| #include "SkUtils.h" |
| #include "SkXfermode.h" |
| |
| static void sk_memset64(uint64_t dst[], uint64_t value, int count) { |
| for (int i = 0; i < count; ++i) { |
| dst[i] = value; |
| } |
| } |
| |
| enum DstType { |
| kU16_Dst, |
| kF16_Dst, |
| }; |
| |
| static Sk4f lerp_by_coverage(const Sk4f& src, const Sk4f& dst, uint8_t srcCoverage) { |
| return dst + (src - dst) * Sk4f(srcCoverage * (1/255.0f)); |
| } |
| |
| template <DstType D> Sk4f unit_to_bias(const Sk4f& x4) { |
| return (D == kU16_Dst) ? x4 * Sk4f(65535) : x4; |
| } |
| |
| template <DstType D> Sk4f bias_to_unit(const Sk4f& x4) { |
| return (D == kU16_Dst) ? x4 * Sk4f(1.0f/65535) : x4; |
| } |
| |
| // returns value already biased by 65535 |
| static Sk4f load_from_u16(uint64_t value) { |
| return SkNx_cast<float>(Sk4h::Load(&value)); |
| } |
| |
| // takes floats already biased by 65535 |
| static uint64_t store_to_u16(const Sk4f& x4) { |
| uint64_t value; |
| SkNx_cast<uint16_t>(x4 + Sk4f(0.5f)).store(&value); |
| return value; |
| } |
| |
| // Returns dst in its "natural" bias (either unit-float or 16bit int) |
| // |
| template <DstType D> Sk4f load_from_dst(uint64_t dst) { |
| return (D == kU16_Dst) ? load_from_u16(dst) : SkHalfToFloat_01(dst); |
| } |
| |
| // Assumes x4 is already in the "natural" bias (either unit-float or 16bit int) |
| template <DstType D> uint64_t store_to_dst(const Sk4f& x4) { |
| return (D == kU16_Dst) ? store_to_u16(x4) : SkFloatToHalf_01(x4); |
| } |
| |
| static inline Sk4f pm_to_rgba_order(const Sk4f& x) { |
| if (SkPM4f::R == 0) { |
| return x; // we're already RGBA |
| } else { |
| // we're BGRA, so swap R and B |
| return SkNx_shuffle<2, 1, 0, 3>(x); |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| template <DstType D> void xfer_u64_1(const SkXfermode* xfer, uint64_t dst[], |
| const SkPM4f* src, int count, const SkAlpha aa[]) { |
| SkXfermodeProc4f proc = xfer->getProc4f(); |
| SkPM4f d; |
| if (aa) { |
| for (int i = 0; i < count; ++i) { |
| Sk4f d4 = bias_to_unit<D>(load_from_dst<D>(dst[i])); |
| d4.store(d.fVec); |
| Sk4f r4 = unit_to_bias<D>(Sk4f::Load(proc(*src, d).fVec)); |
| dst[i] = store_to_dst<D>(lerp_by_coverage(r4, d4, aa[i])); |
| } |
| } else { |
| for (int i = 0; i < count; ++i) { |
| bias_to_unit<D>(load_from_dst<D>(dst[i])).store(d.fVec); |
| Sk4f r4 = unit_to_bias<D>(Sk4f::Load(proc(*src, d).fVec)); |
| dst[i] = store_to_dst<D>(r4); |
| } |
| } |
| } |
| |
| template <DstType D> void xfer_u64_n(const SkXfermode* xfer, uint64_t dst[], |
| const SkPM4f src[], int count, const SkAlpha aa[]) { |
| SkXfermodeProc4f proc = xfer->getProc4f(); |
| SkPM4f d; |
| if (aa) { |
| for (int i = 0; i < count; ++i) { |
| Sk4f d4 = bias_to_unit<D>(load_from_dst<D>(dst[i])); |
| d4.store(d.fVec); |
| Sk4f r4 = unit_to_bias<D>(Sk4f::Load(proc(src[i], d).fVec)); |
| dst[i] = store_to_dst<D>(lerp_by_coverage(r4, d4, aa[i])); |
| } |
| } else { |
| for (int i = 0; i < count; ++i) { |
| bias_to_unit<D>(load_from_dst<D>(dst[i])).store(d.fVec); |
| Sk4f r4 = unit_to_bias<D>(Sk4f::Load(proc(src[i], d).fVec)); |
| dst[i] = store_to_dst<D>(r4); |
| } |
| } |
| } |
| |
| const SkXfermode::D64Proc gProcs_General[] = { |
| xfer_u64_n<kU16_Dst>, xfer_u64_n<kU16_Dst>, |
| xfer_u64_1<kU16_Dst>, xfer_u64_1<kU16_Dst>, |
| xfer_u64_n<kF16_Dst>, xfer_u64_n<kF16_Dst>, |
| xfer_u64_1<kF16_Dst>, xfer_u64_1<kF16_Dst>, |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| template <DstType D> void clear(const SkXfermode*, uint64_t dst[], |
| const SkPM4f*, int count, const SkAlpha aa[]) { |
| if (aa) { |
| for (int i = 0; i < count; ++i) { |
| if (aa[i]) { |
| const Sk4f d4 = load_from_dst<D>(dst[i]); |
| dst[i] = store_to_dst<D>(d4 * Sk4f((255 - aa[i]) * 1.0f/255)); |
| } |
| } |
| } else { |
| sk_memset64(dst, 0, count); |
| } |
| } |
| |
| const SkXfermode::D64Proc gProcs_Clear[] = { |
| clear<kU16_Dst>, clear<kU16_Dst>, |
| clear<kU16_Dst>, clear<kU16_Dst>, |
| clear<kF16_Dst>, clear<kF16_Dst>, |
| clear<kF16_Dst>, clear<kF16_Dst>, |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| template <DstType D> void src_1(const SkXfermode*, uint64_t dst[], |
| const SkPM4f* src, int count, const SkAlpha aa[]) { |
| const Sk4f s4 = pm_to_rgba_order(unit_to_bias<D>(Sk4f::Load(src->fVec))); |
| if (aa) { |
| for (int i = 0; i < count; ++i) { |
| const Sk4f d4 = load_from_dst<D>(dst[i]); |
| dst[i] = store_to_dst<D>(lerp_by_coverage(s4, d4, aa[i])); |
| } |
| } else { |
| sk_memset64(dst, store_to_dst<D>(s4), count); |
| } |
| } |
| |
| template <DstType D> void src_n(const SkXfermode*, uint64_t dst[], |
| const SkPM4f src[], int count, const SkAlpha aa[]) { |
| if (aa) { |
| for (int i = 0; i < count; ++i) { |
| const Sk4f s4 = pm_to_rgba_order(unit_to_bias<D>(Sk4f::Load(src[i].fVec))); |
| const Sk4f d4 = load_from_dst<D>(dst[i]); |
| dst[i] = store_to_dst<D>(lerp_by_coverage(s4, d4, aa[i])); |
| } |
| } else { |
| for (int i = 0; i < count; ++i) { |
| const Sk4f s4 = pm_to_rgba_order(unit_to_bias<D>(Sk4f::Load(src[i].fVec))); |
| dst[i] = store_to_dst<D>(s4); |
| } |
| } |
| } |
| |
| const SkXfermode::D64Proc gProcs_Src[] = { |
| src_n<kU16_Dst>, src_n<kU16_Dst>, |
| src_1<kU16_Dst>, src_1<kU16_Dst>, |
| src_n<kF16_Dst>, src_n<kF16_Dst>, |
| src_1<kF16_Dst>, src_1<kF16_Dst>, |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| static void dst(const SkXfermode*, uint64_t*, const SkPM4f*, int count, const SkAlpha[]) {} |
| |
| const SkXfermode::D64Proc gProcs_Dst[] = { |
| dst, dst, dst, dst, dst, dst, dst, dst, |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| template <DstType D> void srcover_1(const SkXfermode*, uint64_t dst[], |
| const SkPM4f* src, int count, const SkAlpha aa[]) { |
| const Sk4f s4 = pm_to_rgba_order(Sk4f::Load(src->fVec)); |
| const Sk4f dst_scale = Sk4f(1 - get_alpha(s4)); |
| const Sk4f s4bias = unit_to_bias<D>(s4); |
| for (int i = 0; i < count; ++i) { |
| const Sk4f d4bias = load_from_dst<D>(dst[i]); |
| const Sk4f r4bias = s4bias + d4bias * dst_scale; |
| if (aa) { |
| dst[i] = store_to_dst<D>(lerp_by_coverage(r4bias, d4bias, aa[i])); |
| } else { |
| dst[i] = store_to_dst<D>(r4bias); |
| } |
| } |
| } |
| |
| template <DstType D> void srcover_n(const SkXfermode*, uint64_t dst[], |
| const SkPM4f src[], int count, const SkAlpha aa[]) { |
| for (int i = 0; i < count; ++i) { |
| const Sk4f s4 = pm_to_rgba_order(Sk4f::Load(src[i].fVec)); |
| const Sk4f dst_scale = Sk4f(1 - get_alpha(s4)); |
| const Sk4f s4bias = unit_to_bias<D>(s4); |
| const Sk4f d4bias = load_from_dst<D>(dst[i]); |
| const Sk4f r4bias = s4bias + d4bias * dst_scale; |
| if (aa) { |
| dst[i] = store_to_dst<D>(lerp_by_coverage(r4bias, d4bias, aa[i])); |
| } else { |
| dst[i] = store_to_dst<D>(r4bias); |
| } |
| } |
| } |
| |
| const SkXfermode::D64Proc gProcs_SrcOver[] = { |
| srcover_n<kU16_Dst>, src_n<kU16_Dst>, |
| srcover_1<kU16_Dst>, src_1<kU16_Dst>, |
| srcover_n<kF16_Dst>, src_n<kF16_Dst>, |
| srcover_1<kF16_Dst>, src_1<kF16_Dst>, |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| static SkXfermode::D64Proc find_proc(SkXfermode::Mode mode, uint32_t flags) { |
| SkASSERT(0 == (flags & ~7)); |
| flags &= 7; |
| |
| switch (mode) { |
| case SkXfermode::kClear_Mode: return gProcs_Clear[flags]; |
| case SkXfermode::kSrc_Mode: return gProcs_Src[flags]; |
| case SkXfermode::kDst_Mode: return gProcs_Dst[flags]; |
| case SkXfermode::kSrcOver_Mode: return gProcs_SrcOver[flags]; |
| default: |
| break; |
| } |
| return gProcs_General[flags]; |
| } |
| |
| SkXfermode::D64Proc SkXfermode::onGetD64Proc(uint32_t flags) const { |
| SkASSERT(0 == (flags & ~7)); |
| flags &= 7; |
| |
| Mode mode; |
| return this->asMode(&mode) ? find_proc(mode, flags) : gProcs_General[flags]; |
| } |
| |
| SkXfermode::D64Proc SkXfermode::GetD64Proc(SkXfermode* xfer, uint32_t flags) { |
| return xfer ? xfer->onGetD64Proc(flags) : find_proc(SkXfermode::kSrcOver_Mode, flags); |
| } |
| |