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/*
* 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 Sk4f lerp_by_coverage(const Sk4f& src, const Sk4f& dst, uint8_t srcCoverage) {
return dst + (src - dst) * Sk4f(srcCoverage * (1/255.0f));
}
///////////////////////////////////////////////////////////////////////////////////////////////////
static void xfer_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 = SkHalfToFloat_finite(dst[i]);
d4.store(d.fVec);
Sk4f r4 = Sk4f::Load(proc(*src, d).fVec);
dst[i] = SkFloatToHalf_finite(lerp_by_coverage(r4, d4, aa[i]));
}
} else {
for (int i = 0; i < count; ++i) {
SkHalfToFloat_finite(dst[i]).store(d.fVec);
Sk4f r4 = Sk4f::Load(proc(*src, d).fVec);
dst[i] = SkFloatToHalf_finite(r4);
}
}
}
static void xfer_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 = SkHalfToFloat_finite(dst[i]);
d4.store(d.fVec);
Sk4f r4 = Sk4f::Load(proc(src[i], d).fVec);
dst[i] = SkFloatToHalf_finite(lerp_by_coverage(r4, d4, aa[i]));
}
} else {
for (int i = 0; i < count; ++i) {
SkHalfToFloat_finite(dst[i]).store(d.fVec);
Sk4f r4 = Sk4f::Load(proc(src[i], d).fVec);
dst[i] = SkFloatToHalf_finite(r4);
}
}
}
const SkXfermode::F16Proc gProcs_General[] = { xfer_n, xfer_n, xfer_1, xfer_1 };
///////////////////////////////////////////////////////////////////////////////////////////////////
static 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 = SkHalfToFloat_finite(dst[i]);
dst[i] = SkFloatToHalf_finite(d4 * Sk4f((255 - aa[i]) * 1.0f/255));
}
}
} else {
sk_memset64(dst, 0, count);
}
}
const SkXfermode::F16Proc gProcs_Clear[] = { clear, clear, clear, clear };
///////////////////////////////////////////////////////////////////////////////////////////////////
static void src_1(const SkXfermode*, uint64_t dst[], const SkPM4f* src, int count,
const SkAlpha aa[]) {
const Sk4f s4 = Sk4f::Load(src->fVec);
if (aa) {
for (int i = 0; i < count; ++i) {
const Sk4f d4 = SkHalfToFloat_finite(dst[i]);
dst[i] = SkFloatToHalf_finite(lerp_by_coverage(s4, d4, aa[i]));
}
} else {
sk_memset64(dst, SkFloatToHalf_finite(s4), count);
}
}
static 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 = Sk4f::Load(src[i].fVec);
const Sk4f d4 = SkHalfToFloat_finite(dst[i]);
dst[i] = SkFloatToHalf_finite(lerp_by_coverage(s4, d4, aa[i]));
}
} else {
for (int i = 0; i < count; ++i) {
const Sk4f s4 = Sk4f::Load(src[i].fVec);
dst[i] = SkFloatToHalf_finite(s4);
}
}
}
const SkXfermode::F16Proc gProcs_Src[] = { src_n, src_n, src_1, src_1 };
///////////////////////////////////////////////////////////////////////////////////////////////////
static void dst(const SkXfermode*, uint64_t*, const SkPM4f*, int count, const SkAlpha[]) {}
const SkXfermode::F16Proc gProcs_Dst[] = { dst, dst, dst, dst };
///////////////////////////////////////////////////////////////////////////////////////////////////
static void srcover_1(const SkXfermode*, uint64_t dst[], const SkPM4f* src, int count,
const SkAlpha aa[]) {
const Sk4f s4 = Sk4f::Load(src->fVec);
const Sk4f dst_scale = Sk4f(1 - get_alpha(s4));
for (int i = 0; i < count; ++i) {
const Sk4f d4 = SkHalfToFloat_finite(dst[i]);
const Sk4f r4 = s4 + d4 * dst_scale;
if (aa) {
dst[i] = SkFloatToHalf_finite(lerp_by_coverage(r4, d4, aa[i]));
} else {
dst[i] = SkFloatToHalf_finite(r4);
}
}
}
static void srcover_n(const SkXfermode*, uint64_t dst[], const SkPM4f src[], int count,
const SkAlpha aa[]) {
for (int i = 0; i < count; ++i) {
Sk4f s = Sk4f::Load(src+i),
d = SkHalfToFloat_finite(dst[i]),
r = s + d*(1.0f - SkNx_shuffle<3,3,3,3>(s));
if (aa) {
r = lerp_by_coverage(r, d, aa[i]);
}
dst[i] = SkFloatToHalf_finite(r);
}
}
const SkXfermode::F16Proc gProcs_SrcOver[] = { srcover_n, src_n, srcover_1, src_1 };
///////////////////////////////////////////////////////////////////////////////////////////////////
static SkXfermode::F16Proc find_proc(SkXfermode::Mode mode, uint32_t flags) {
SkASSERT(0 == (flags & ~3));
flags &= 3;
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::F16Proc SkXfermode::onGetF16Proc(uint32_t flags) const {
SkASSERT(0 == (flags & ~3));
flags &= 3;
Mode mode;
return this->asMode(&mode) ? find_proc(mode, flags) : gProcs_General[flags];
}
SkXfermode::F16Proc SkXfermode::GetF16Proc(SkXfermode* xfer, uint32_t flags) {
return xfer ? xfer->onGetF16Proc(flags) : find_proc(SkXfermode::kSrcOver_Mode, flags);
}
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