blob: 86b343900782cc269eda83e3be200b9a7b5aa688 [file] [log] [blame]
/*
* Copyright 2021 Google LLC
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "include/core/SkBlender.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkBlenders.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkData.h"
#include "include/core/SkScalar.h"
#include "include/effects/SkRuntimeEffect.h"
#include "include/private/base/SkFloatingPoint.h"
#include "src/core/SkKnownRuntimeEffects.h"
sk_sp<SkBlender> SkBlenders::Arithmetic(float k1, float k2, float k3, float k4,
bool enforcePremul) {
using namespace SkKnownRuntimeEffects;
if (!SkIsFinite(k1, k2, k3, k4)) {
return nullptr;
}
// Are we nearly a SkBlendMode?
const struct {
float k1, k2, k3, k4;
SkBlendMode mode;
} table[] = {
{ 0, 1, 0, 0, SkBlendMode::kSrc },
{ 0, 0, 1, 0, SkBlendMode::kDst },
{ 0, 0, 0, 0, SkBlendMode::kClear },
};
for (const auto& t : table) {
if (SkScalarNearlyEqual(k1, t.k1) &&
SkScalarNearlyEqual(k2, t.k2) &&
SkScalarNearlyEqual(k3, t.k3) &&
SkScalarNearlyEqual(k4, t.k4)) {
return SkBlender::Mode(t.mode);
}
}
// If we get here, we need the actual blender effect.
const SkRuntimeEffect* arithmeticEffect = GetKnownRuntimeEffect(StableKey::kArithmetic);
const float array[] = {
k1, k2, k3, k4,
enforcePremul ? 0.0f : 1.0f,
};
return arithmeticEffect->makeBlender(SkData::MakeWithCopy(array, sizeof(array)));
}