flesh out gradient shaders

core/fpdfapi/fpdf_page/pageint.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_FPDFAPI_FPDF_PAGE_PAGEINT_H_
 #define CORE_FPDFAPI_FPDF_PAGE_PAGEINT_H_
 
 #include <map>
@@ skipping 375 matching lines @@
 
   static CPDF_Function* Load(CPDF_Object* pFuncObj);
   virtual ~CPDF_Function();
   FX_BOOL Call(FX_FLOAT* inputs,
                uint32_t ninputs,
                FX_FLOAT* results,
                int& nresults) const;
   uint32_t CountInputs() const { return m_nInputs; }
   uint32_t CountOutputs() const { return m_nOutputs; }
   FX_FLOAT GetDomain(int i) const { return m_pDomains[i]; }
+  FX_FLOAT GetRange(int i) const { return m_pRanges[i]; }
   Type GetType() const { return m_Type; }
 
  protected:
   CPDF_Function(Type type);
   FX_BOOL Init(CPDF_Object* pObj);
   virtual FX_BOOL v_Init(CPDF_Object* pObj) = 0;
   virtual FX_BOOL v_Call(FX_FLOAT* inputs, FX_FLOAT* results) const = 0;
 
   uint32_t m_nInputs;
   uint32_t m_nOutputs;
@@ skipping 10 matching lines @@
   // CPDF_Function
   FX_BOOL v_Init(CPDF_Object* pObj) override;
   FX_BOOL v_Call(FX_FLOAT* inputs, FX_FLOAT* results) const override;
 
   uint32_t m_nOrigOutputs;
   FX_FLOAT m_Exponent;
   FX_FLOAT* m_pBeginValues;
   FX_FLOAT* m_pEndValues;
 };
 
+class CPDF_SampledFunc : public CPDF_Function {
+ public:
+  struct SampleEncodeInfo {
+    FX_FLOAT encode_max;
+    FX_FLOAT encode_min;
+    uint32_t sizes;
+  };
+
+  struct SampleDecodeInfo {
+    FX_FLOAT decode_max;
+    FX_FLOAT decode_min;
+  };
+
+  CPDF_SampledFunc();
+  ~CPDF_SampledFunc() override;
+
+  // CPDF_Function
+  FX_BOOL v_Init(CPDF_Object* pObj) override;
+  FX_BOOL v_Call(FX_FLOAT* inputs, FX_FLOAT* results) const override;
+
+  SampleEncodeInfo* m_pEncodeInfo;
+  SampleDecodeInfo* m_pDecodeInfo;
+  uint32_t m_nBitsPerSample;
+  uint32_t m_SampleMax;
+  CPDF_StreamAcc* m_pSampleStream;
+};
+
 class CPDF_StitchFunc : public CPDF_Function {
  public:
   CPDF_StitchFunc();
   ~CPDF_StitchFunc() override;
 
   // CPDF_Function
   FX_BOOL v_Init(CPDF_Object* pObj) override;
   FX_BOOL v_Call(FX_FLOAT* inputs, FX_FLOAT* results) const override;
 
   std::vector<CPDF_Function*> m_pSubFunctions;
@@ skipping 70 matching lines @@
 };
 
 CFX_ByteStringC PDF_FindKeyAbbreviationForTesting(const CFX_ByteStringC& abbr);
 CFX_ByteStringC PDF_FindValueAbbreviationForTesting(
     const CFX_ByteStringC& abbr);
 
 void PDF_ReplaceAbbr(CPDF_Object* pObj);
 bool IsPathOperator(const uint8_t* buf, size_t len);
 
 #endif  // CORE_FPDFAPI_FPDF_PAGE_PAGEINT_H_