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// Copyright 2016 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#ifndef CORE_FPDFAPI_PAGE_CPDF_SHADINGPATTERN_H_
#define CORE_FPDFAPI_PAGE_CPDF_SHADINGPATTERN_H_
#include <memory>
#include <vector>
#include "core/fpdfapi/page/cpdf_colorspace.h"
#include "core/fpdfapi/page/cpdf_pattern.h"
#include "core/fxcrt/fx_system.h"
#include "core/fxcrt/unowned_ptr.h"
enum ShadingType {
kInvalidShading = 0,
kFunctionBasedShading = 1,
kAxialShading = 2,
kRadialShading = 3,
kFreeFormGouraudTriangleMeshShading = 4,
kLatticeFormGouraudTriangleMeshShading = 5,
kCoonsPatchMeshShading = 6,
kTensorProductPatchMeshShading = 7,
kMaxShading = 8
};
class CFX_Matrix;
class CPDF_ColorSpace;
class CPDF_Document;
class CPDF_Function;
class CPDF_Object;
class CPDF_ShadingPattern : public CPDF_Pattern {
public:
CPDF_ShadingPattern(CPDF_Document* pDoc,
CPDF_Object* pPatternObj,
bool bShading,
const CFX_Matrix& parentMatrix);
~CPDF_ShadingPattern() override;
CPDF_TilingPattern* AsTilingPattern() override;
CPDF_ShadingPattern* AsShadingPattern() override;
bool IsMeshShading() const {
return m_ShadingType == kFreeFormGouraudTriangleMeshShading ||
m_ShadingType == kLatticeFormGouraudTriangleMeshShading ||
m_ShadingType == kCoonsPatchMeshShading ||
m_ShadingType == kTensorProductPatchMeshShading;
}
bool Load();
ShadingType GetShadingType() const { return m_ShadingType; }
bool IsShadingObject() const { return m_bShadingObj; }
const CPDF_Object* GetShadingObject() const { return m_pShadingObj.Get(); }
CPDF_ColorSpace* GetCS() const { return m_pCS.Get(); }
const std::vector<std::unique_ptr<CPDF_Function>>& GetFuncs() const {
return m_pFunctions;
}
private:
// Constraints in PDF 1.7 spec, 4.6.3 Shading Patterns, pages 308-331.
bool Validate() const;
bool ValidateFunctions(uint32_t nExpectedNumFunctions,
uint32_t nExpectedNumInputs,
uint32_t nExpectedNumOutputs) const;
ShadingType m_ShadingType = kInvalidShading;
const bool m_bShadingObj;
UnownedPtr<const CPDF_Object> m_pShadingObj;
// Still keep |m_pCS| as some CPDF_ColorSpace (name object) are not managed
// as counted objects. Refer to CPDF_DocPageData::GetColorSpace.
UnownedPtr<CPDF_ColorSpace> m_pCS;
UnownedPtr<CPDF_CountedColorSpace> m_pCountedCS;
std::vector<std::unique_ptr<CPDF_Function>> m_pFunctions;
};
#endif // CORE_FPDFAPI_PAGE_CPDF_SHADINGPATTERN_H_
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