Give names to the shading types

core/include/fpdfapi/fpdf_resource.h

 // Copyright 2014 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_INCLUDE_FPDFAPI_FPDF_RESOURCE_H_
 #define CORE_INCLUDE_FPDFAPI_FPDF_RESOURCE_H_
 
 #include "../fxcrt/fx_system.h"
@@ skipping 661 matching lines @@
   FX_BOOL m_bColored;
 
   CFX_FloatRect m_BBox;
 
   FX_FLOAT m_XStep;
 
   FX_FLOAT m_YStep;
 
   CPDF_Form* m_pForm;
 };
+
+typedef enum {
+  kInvalidShading = 0,
+  kFunctionBasedShading = 1,
+  kAxialShading = 2,
+  kRadialShading = 3,
+  kFreeFormGouraudTriangleMeshShading = 4,
+  kLatticeFormGouraudTriangleMeshShading = 5,
+  kCoonsPatchMeshShading = 6,
+  kTensorProductPatchMeshShading = 7,
+  kMaxShading = 8
+} ShadingType;
+
 class CPDF_ShadingPattern : public CPDF_Pattern {
  public:
   CPDF_ShadingPattern(CPDF_Document* pDoc,
                       CPDF_Object* pPatternObj,
                       FX_BOOL bShading,
                       const CFX_AffineMatrix* parentMatrix);
 
   ~CPDF_ShadingPattern() override;
 
+  bool IsMeshShading() const {
+    return m_ShadingType == kFreeFormGouraudTriangleMeshShading ||
+           m_ShadingType == kLatticeFormGouraudTriangleMeshShading ||
+           m_ShadingType == kCoonsPatchMeshShading ||
+           m_ShadingType == kTensorProductPatchMeshShading;
+  }
+
   CPDF_Object* m_pShadingObj;
 
   FX_BOOL m_bShadingObj;
 
   FX_BOOL Load();
 
   FX_BOOL Reload();
 
-  int m_ShadingType;
+  ShadingType m_ShadingType;
 
   CPDF_ColorSpace* m_pCS;  // Still keep m_pCS as some CPDF_ColorSpace (name
                            // object) are not managed as counted objects. Refer
                            // to CPDF_DocPageData::GetColorSpace.
 
   CPDF_CountedColorSpace* m_pCountedCS;
 
   CPDF_Function* m_pFunctions[4];
 
   int m_nFuncs;
@@ skipping 124 matching lines @@
 
   FX_BOOL m_bInterpolate;
 
   CPDF_Document* m_pDocument;
 
   CPDF_Dictionary* m_pOC;
   CPDF_Dictionary* InitJPEG(uint8_t* pData, FX_DWORD size);
 };
 
 #endif  // CORE_INCLUDE_FPDFAPI_FPDF_RESOURCE_H_