SkNormalSource::Provider* SkNormalMapSourceImpl::asProvider(const SkShaderBase::ContextRec &rec,
SkArenaAlloc* alloc) const {
SkMatrix normTotalInv;
if (!this->computeNormTotalInverse(rec, &normTotalInv)) {
return nullptr;
}
// Overriding paint's alpha because we need the normal map's RGB channels to be unpremul'd
SkPaint overridePaint {*(rec.fPaint)};
overridePaint.setAlpha(0xFF);
SkShaderBase::ContextRec overrideRec(overridePaint, *(rec.fMatrix), rec.fLocalMatrix,
rec.fPreferredDstType, rec.fDstColorSpace);
auto* context = as_SB(fMapShader)->makeContext(overrideRec, alloc);
if (!context) {
return nullptr;
}
return alloc->make<Provider>(*this, context);
}
SkNormalSource::Provider* SkNormalMapSourceImpl::asProvider(const SkShader::ContextRec &rec,
void *storage) const {
SkMatrix normTotalInv;
if (!this->computeNormTotalInverse(rec, &normTotalInv)) {
return nullptr;
}
// Overriding paint's alpha because we need the normal map's RGB channels to be unpremul'd
void* paintStorage = (char*)storage + sizeof(Provider);
SkPaint* overridePaint = new (paintStorage) SkPaint(*(rec.fPaint));
overridePaint->setAlpha(0xFF);
SkShader::ContextRec overrideRec(*overridePaint, *(rec.fMatrix), rec.fLocalMatrix,
rec.fPreferredDstType);
void* mapContextStorage = (char*) paintStorage + sizeof(SkPaint);
SkShader::Context* context = fMapShader->createContext(overrideRec, mapContextStorage);
if (!context) {
return nullptr;
}
return new (storage) Provider(*this, context, overridePaint);
}