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/*
* 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 "src/core/SkBlendModeBlender.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkBlender.h"
#include "include/core/SkRefCnt.h"
#include "include/private/base/SkAssert.h"
#include "src/base/SkNoDestructor.h"
#include "src/core/SkBlendModePriv.h"
#include "src/core/SkEffectPriv.h"
#include "src/core/SkReadBuffer.h"
#include "src/core/SkWriteBuffer.h"
sk_sp<SkBlender> SkBlender::Mode(SkBlendMode mode) {
#define RETURN_SINGLETON_BLENDER(m) \
case m: { \
static SkNoDestructor<SkBlendModeBlender> sBlender(m); \
return sk_ref_sp(sBlender.get()); \
}
switch (mode) {
RETURN_SINGLETON_BLENDER(SkBlendMode::kClear)
RETURN_SINGLETON_BLENDER(SkBlendMode::kSrc)
RETURN_SINGLETON_BLENDER(SkBlendMode::kDst)
RETURN_SINGLETON_BLENDER(SkBlendMode::kSrcOver)
RETURN_SINGLETON_BLENDER(SkBlendMode::kDstOver)
RETURN_SINGLETON_BLENDER(SkBlendMode::kSrcIn)
RETURN_SINGLETON_BLENDER(SkBlendMode::kDstIn)
RETURN_SINGLETON_BLENDER(SkBlendMode::kSrcOut)
RETURN_SINGLETON_BLENDER(SkBlendMode::kDstOut)
RETURN_SINGLETON_BLENDER(SkBlendMode::kSrcATop)
RETURN_SINGLETON_BLENDER(SkBlendMode::kDstATop)
RETURN_SINGLETON_BLENDER(SkBlendMode::kXor)
RETURN_SINGLETON_BLENDER(SkBlendMode::kPlus)
RETURN_SINGLETON_BLENDER(SkBlendMode::kModulate)
RETURN_SINGLETON_BLENDER(SkBlendMode::kScreen)
RETURN_SINGLETON_BLENDER(SkBlendMode::kOverlay)
RETURN_SINGLETON_BLENDER(SkBlendMode::kDarken)
RETURN_SINGLETON_BLENDER(SkBlendMode::kLighten)
RETURN_SINGLETON_BLENDER(SkBlendMode::kColorDodge)
RETURN_SINGLETON_BLENDER(SkBlendMode::kColorBurn)
RETURN_SINGLETON_BLENDER(SkBlendMode::kHardLight)
RETURN_SINGLETON_BLENDER(SkBlendMode::kSoftLight)
RETURN_SINGLETON_BLENDER(SkBlendMode::kDifference)
RETURN_SINGLETON_BLENDER(SkBlendMode::kExclusion)
RETURN_SINGLETON_BLENDER(SkBlendMode::kMultiply)
RETURN_SINGLETON_BLENDER(SkBlendMode::kHue)
RETURN_SINGLETON_BLENDER(SkBlendMode::kSaturation)
RETURN_SINGLETON_BLENDER(SkBlendMode::kColor)
RETURN_SINGLETON_BLENDER(SkBlendMode::kLuminosity)
}
SkDEBUGFAILF("invalid blend mode %d", (int)mode);
return nullptr;
#undef RETURN_SINGLETON_BLENDER
}
sk_sp<SkFlattenable> SkBlendModeBlender::CreateProc(SkReadBuffer& buffer) {
SkBlendMode mode = buffer.read32LE(SkBlendMode::kLastMode);
return SkBlender::Mode(mode);
}
void SkBlendModeBlender::flatten(SkWriteBuffer& buffer) const {
buffer.writeInt((int)fMode);
}
bool SkBlendModeBlender::onAppendStages(const SkStageRec& rec) const {
SkBlendMode_AppendStages(fMode, rec.fPipeline);
return true;
}
bool SkBlenderBase::affectsTransparentBlack() const {
if (auto blendMode = this->asBlendMode()) {
SkBlendModeCoeff src, dst;
if (SkBlendMode_AsCoeff(*blendMode, &src, &dst)) {
// If the source is (0,0,0,0), then dst is preserved as long as its coefficient
// evaluates to 1.0. This is true for kOne, kISA, and kISC. Anything else means the
// blend mode affects transparent black.
return dst != SkBlendModeCoeff::kOne &&
dst != SkBlendModeCoeff::kISA &&
dst != SkBlendModeCoeff::kISC;
} else {
// An advanced blend mode, which do not affect transparent black
return false;
}
} else {
// Blenders that aren't blend modes are assumed to modify transparent black.
return true;
}
}