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1 // Copyright 2016 PDFium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
6 
7 #ifndef CORE_FPDFAPI_PAGE_CPDF_SHADINGPATTERN_H_
8 #define CORE_FPDFAPI_PAGE_CPDF_SHADINGPATTERN_H_
9 
10 #include <memory>
11 #include <vector>
12 
13 #include "core/fpdfapi/page/cpdf_colorspace.h"
14 #include "core/fpdfapi/page/cpdf_pattern.h"
15 #include "core/fxcrt/fx_system.h"
16 #include "core/fxcrt/unowned_ptr.h"
17 
18 enum ShadingType {
19   kInvalidShading = 0,
20   kFunctionBasedShading = 1,
21   kAxialShading = 2,
22   kRadialShading = 3,
23   kFreeFormGouraudTriangleMeshShading = 4,
24   kLatticeFormGouraudTriangleMeshShading = 5,
25   kCoonsPatchMeshShading = 6,
26   kTensorProductPatchMeshShading = 7,
27   kMaxShading = 8
28 };
29 
30 class CFX_Matrix;
31 class CPDF_ColorSpace;
32 class CPDF_Document;
33 class CPDF_Function;
34 class CPDF_Object;
35 
36 class CPDF_ShadingPattern : public CPDF_Pattern {
37  public:
38   CPDF_ShadingPattern(CPDF_Document* pDoc,
39                       CPDF_Object* pPatternObj,
40                       bool bShading,
41                       const CFX_Matrix& parentMatrix);
42   ~CPDF_ShadingPattern() override;
43 
44   CPDF_TilingPattern* AsTilingPattern() override;
45   CPDF_ShadingPattern* AsShadingPattern() override;
46 
IsMeshShading()47   bool IsMeshShading() const {
48     return m_ShadingType == kFreeFormGouraudTriangleMeshShading ||
49            m_ShadingType == kLatticeFormGouraudTriangleMeshShading ||
50            m_ShadingType == kCoonsPatchMeshShading ||
51            m_ShadingType == kTensorProductPatchMeshShading;
52   }
53   bool Load();
54 
GetShadingType()55   ShadingType GetShadingType() const { return m_ShadingType; }
IsShadingObject()56   bool IsShadingObject() const { return m_bShadingObj; }
GetShadingObject()57   CPDF_Object* GetShadingObject() const { return m_pShadingObj.Get(); }
GetCS()58   CPDF_ColorSpace* GetCS() const { return m_pCS.Get(); }
GetFuncs()59   const std::vector<std::unique_ptr<CPDF_Function>>& GetFuncs() const {
60     return m_pFunctions;
61   }
62 
63  private:
64   // Constraints in PDF 1.7 spec, 4.6.3 Shading Patterns, pages 308-331.
65   bool Validate() const;
66   bool ValidateFunctions(uint32_t nExpectedNumFunctions,
67                          uint32_t nExpectedNumInputs,
68                          uint32_t nExpectedNumOutputs) const;
69 
70   ShadingType m_ShadingType;
71   bool m_bShadingObj;
72   UnownedPtr<CPDF_Object> m_pShadingObj;
73 
74   // Still keep |m_pCS| as some CPDF_ColorSpace (name object) are not managed
75   // as counted objects. Refer to CPDF_DocPageData::GetColorSpace.
76   UnownedPtr<CPDF_ColorSpace> m_pCS;
77 
78   UnownedPtr<CPDF_CountedColorSpace> m_pCountedCS;
79   std::vector<std::unique_ptr<CPDF_Function>> m_pFunctions;
80 };
81 
82 #endif  // CORE_FPDFAPI_PAGE_CPDF_SHADINGPATTERN_H_
83