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_TRANSFERFUNC_H_ 8 #define CORE_FPDFAPI_PAGE_CPDF_TRANSFERFUNC_H_ 9 10 #include <vector> 11 12 #include "core/fxcrt/observed_ptr.h" 13 #include "core/fxcrt/retain_ptr.h" 14 #include "core/fxcrt/unowned_ptr.h" 15 #include "core/fxge/fx_dib.h" 16 #include "third_party/base/span.h" 17 18 class CPDF_Document; 19 class CFX_DIBBase; 20 21 class CPDF_TransferFunc final : public Retainable, public Observable { 22 public: 23 template <typename T, typename... Args> 24 friend RetainPtr<T> pdfium::MakeRetain(Args&&... args); 25 26 static constexpr size_t kChannelSampleSize = 256; 27 28 FX_COLORREF TranslateColor(FX_COLORREF colorref) const; 29 RetainPtr<CFX_DIBBase> TranslateImage(const RetainPtr<CFX_DIBBase>& pSrc); 30 GetDocument()31 const CPDF_Document* GetDocument() const { return m_pPDFDoc.Get(); } 32 33 // Spans are |kChannelSampleSize| in size. 34 pdfium::span<const uint8_t> GetSamplesR() const; 35 pdfium::span<const uint8_t> GetSamplesG() const; 36 pdfium::span<const uint8_t> GetSamplesB() const; 37 GetIdentity()38 bool GetIdentity() const { return m_bIdentity; } 39 40 private: 41 CPDF_TransferFunc(CPDF_Document* pDoc, 42 bool bIdentify, 43 std::vector<uint8_t> samples_r, 44 std::vector<uint8_t> samples_g, 45 std::vector<uint8_t> samples_b); 46 ~CPDF_TransferFunc() override; 47 48 UnownedPtr<CPDF_Document> const m_pPDFDoc; 49 const bool m_bIdentity; 50 const std::vector<uint8_t> m_SamplesR; 51 const std::vector<uint8_t> m_SamplesG; 52 const std::vector<uint8_t> m_SamplesB; 53 }; 54 55 #endif // CORE_FPDFAPI_PAGE_CPDF_TRANSFERFUNC_H_ 56