Give names to the shading types

Currently the shading types are referenced by number. This Cl creates and enum
and updates the code to use the enum names instead of magic numbers.

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1418623011 .

1 files changed, 21 insertions, 1 deletions

diff --git a/core/include/fpdfapi/fpdf_resource.h b/core/include/fpdfapi/fpdf_resource.h
index 9fe6e2b95f..dee15cf941 100644
--- a/core/include/fpdfapi/fpdf_resource.h
+++ b/core/include/fpdfapi/fpdf_resource.h
@@ -679,6 +679,19 @@ class CPDF_TilingPattern : public CPDF_Pattern {
 
   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,
@@ -688,6 +701,13 @@ class CPDF_ShadingPattern : public CPDF_Pattern {
 
   ~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;
@@ -696,7 +716,7 @@ class CPDF_ShadingPattern : public CPDF_Pattern {
 
   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