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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkEmptyShader_DEFINED
#define SkEmptyShader_DEFINED
#include "SkShader.h"
// TODO: move this to private, as there is a public factory on SkShader
/**
* \class SkEmptyShader
* A Shader that always draws nothing. Its createContext always returns NULL.
*/
class SK_API SkEmptyShader : public SkShader {
public:
SkEmptyShader() {}
virtual size_t contextSize() const SK_OVERRIDE {
// Even though createContext returns NULL we have to return a value of at least
// sizeof(SkShader::Context) to satisfy SkSmallAllocator.
return sizeof(SkShader::Context);
}
SK_TO_STRING_OVERRIDE()
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkEmptyShader)
protected:
#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
SkEmptyShader(SkReadBuffer& buffer) : INHERITED(buffer) {}
#endif
virtual SkShader::Context* onCreateContext(const ContextRec&, void*) const SK_OVERRIDE {
return NULL;
}
private:
typedef SkShader INHERITED;
};
#endif
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