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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.
*/
#ifndef Sk4fGradientPriv_DEFINED
#define Sk4fGradientPriv_DEFINED
#include "SkColor.h"
#include "SkHalf.h"
#include "SkImageInfo.h"
#include "SkNx.h"
#include "SkPM4f.h"
#include "SkPM4fPriv.h"
#include "SkUtils.h"
// Templates shared by various 4f gradient flavors.
namespace {
enum class ApplyPremul { True, False };
enum class DstType {
L32, // Linear 32bit. Used for both shader/blitter paths.
S32, // SRGB 32bit. Used for the blitter path only.
F16, // Linear half-float. Used for blitters only.
F32, // Linear float. Used for shaders only.
};
template <ApplyPremul>
struct PremulTraits;
template <>
struct PremulTraits<ApplyPremul::False> {
static Sk4f apply(const Sk4f& c) { return c; }
};
template <>
struct PremulTraits<ApplyPremul::True> {
static Sk4f apply(const Sk4f& c) {
const float alpha = c[SkPM4f::A];
// FIXME: portable swizzle?
return c * Sk4f(alpha, alpha, alpha, 1);
}
};
// Struct encapsulating various dest-dependent ops:
//
// - load() Load a SkPM4f value into Sk4f. Normally called once per interval
// advance. Also applies a scale and swizzle suitable for DstType.
//
// - store() Store one Sk4f to dest. Optionally handles premul, color space
// conversion, etc.
//
// - store(count) Store the Sk4f value repeatedly to dest, count times.
//
// - store4x() Store 4 Sk4f values to dest (opportunistic optimization).
//
template <DstType, ApplyPremul premul>
struct DstTraits;
template <ApplyPremul premul>
struct DstTraits<DstType::L32, premul> {
using PM = PremulTraits<premul>;
using Type = SkPMColor;
// For L32, prescaling by 255 saves a per-pixel multiplication when premul is not needed.
static Sk4f load(const SkPM4f& c) {
return premul == ApplyPremul::False
? c.to4f_pmorder() * Sk4f(255)
: c.to4f_pmorder();
}
static void store(const Sk4f& c, Type* dst) {
if (premul == ApplyPremul::False) {
// c is prescaled by 255, just store.
SkNx_cast<uint8_t>(c).store(dst);
} else {
*dst = Sk4f_toL32(PM::apply(c));
}
}
static void store(const Sk4f& c, Type* dst, int n) {
Type pmc;
store(c, &pmc);
sk_memset32(dst, pmc, n);
}
static void store4x(const Sk4f& c0, const Sk4f& c1,
const Sk4f& c2, const Sk4f& c3,
Type* dst) {
if (premul == ApplyPremul::False) {
Sk4f_ToBytes((uint8_t*)dst, c0, c1, c2, c3);
} else {
store(c0, dst + 0);
store(c1, dst + 1);
store(c2, dst + 2);
store(c3, dst + 3);
}
}
};
template <ApplyPremul premul>
struct DstTraits<DstType::S32, premul> {
using PM = PremulTraits<premul>;
using Type = SkPMColor;
static Sk4f load(const SkPM4f& c) {
return c.to4f_pmorder();
}
static void store(const Sk4f& c, Type* dst) {
// FIXME: this assumes opaque colors. Handle unpremultiplication.
*dst = Sk4f_toS32(PM::apply(c));
}
static void store(const Sk4f& c, Type* dst, int n) {
sk_memset32(dst, Sk4f_toS32(PM::apply(c)), n);
}
static void store4x(const Sk4f& c0, const Sk4f& c1,
const Sk4f& c2, const Sk4f& c3,
Type* dst) {
store(c0, dst + 0);
store(c1, dst + 1);
store(c2, dst + 2);
store(c3, dst + 3);
}
};
template <ApplyPremul premul>
struct DstTraits<DstType::F16, premul> {
using PM = PremulTraits<premul>;
using Type = uint64_t;
static Sk4f load(const SkPM4f& c) {
return c.to4f();
}
static void store(const Sk4f& c, Type* dst) {
SkFloatToHalf_finite_ftz(PM::apply(c)).store(dst);
}
static void store(const Sk4f& c, Type* dst, int n) {
uint64_t color;
SkFloatToHalf_finite_ftz(PM::apply(c)).store(&color);
sk_memset64(dst, color, n);
}
static void store4x(const Sk4f& c0, const Sk4f& c1,
const Sk4f& c2, const Sk4f& c3,
Type* dst) {
store(c0, dst + 0);
store(c1, dst + 1);
store(c2, dst + 2);
store(c3, dst + 3);
}
};
template <ApplyPremul premul>
struct DstTraits<DstType::F32, premul> {
using PM = PremulTraits<premul>;
using Type = SkPM4f;
static Sk4f load(const SkPM4f& c) {
return c.to4f();
}
static void store(const Sk4f& c, Type* dst) {
PM::apply(c).store(dst->fVec);
}
static void store(const Sk4f& c, Type* dst, int n) {
const Sk4f pmc = PM::apply(c);
for (int i = 0; i < n; ++i) {
pmc.store(dst[i].fVec);
}
}
static void store4x(const Sk4f& c0, const Sk4f& c1,
const Sk4f& c2, const Sk4f& c3,
Type* dst) {
store(c0, dst + 0);
store(c1, dst + 1);
store(c2, dst + 2);
store(c3, dst + 3);
}
};
} // anonymous namespace
#endif // Sk4fGradientPriv_DEFINED
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