107 lines
2.9 KiB
C++
107 lines
2.9 KiB
C++
// Copyright 2017 PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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#ifndef CORE_FXGE_DIB_CSTRETCHENGINE_H_
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#define CORE_FXGE_DIB_CSTRETCHENGINE_H_
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#include <vector>
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#include "core/fxcrt/fx_coordinates.h"
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#include "core/fxcrt/retain_ptr.h"
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#include "core/fxcrt/unowned_ptr.h"
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#include "core/fxge/fx_dib.h"
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class CFX_DIBBase;
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class PauseIndicatorIface;
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class ScanlineComposerIface;
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class CStretchEngine {
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public:
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CStretchEngine(ScanlineComposerIface* pDestBitmap,
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FXDIB_Format dest_format,
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int dest_width,
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int dest_height,
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const FX_RECT& clip_rect,
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const RetainPtr<CFX_DIBBase>& pSrcBitmap,
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const FXDIB_ResampleOptions& options);
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~CStretchEngine();
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bool Continue(PauseIndicatorIface* pPause);
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bool StartStretchHorz();
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bool ContinueStretchHorz(PauseIndicatorIface* pPause);
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void StretchVert();
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class CWeightTable {
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public:
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CWeightTable();
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~CWeightTable();
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bool Calc(int dest_len,
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int dest_min,
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int dest_max,
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int src_len,
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int src_min,
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int src_max,
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const FXDIB_ResampleOptions& options);
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const PixelWeight* GetPixelWeight(int pixel) const;
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PixelWeight* GetPixelWeight(int pixel) {
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return const_cast<PixelWeight*>(
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static_cast<const CWeightTable*>(this)->GetPixelWeight(pixel));
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}
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int* GetValueFromPixelWeight(PixelWeight* pWeight, int index) const;
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size_t GetPixelWeightSize() const;
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private:
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int m_DestMin = 0;
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int m_ItemSize = 0;
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size_t m_dwWeightTablesSize = 0;
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std::vector<uint8_t> m_WeightTables;
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};
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enum class State : uint8_t { kInitial, kHorizontal, kVertical };
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enum class TransformMethod : uint8_t {
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k1BppTo8Bpp,
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k1BppToManyBpp,
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k8BppTo8Bpp,
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k8BppTo8BppWithAlpha,
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k8BppToManyBpp,
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k8BppToManyBppWithAlpha,
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kManyBpptoManyBpp,
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kManyBpptoManyBppWithAlpha
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};
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const FXDIB_Format m_DestFormat;
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const int m_DestBpp;
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const int m_SrcBpp;
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const int m_bHasAlpha;
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RetainPtr<CFX_DIBBase> const m_pSource;
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const uint32_t* m_pSrcPalette;
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const int m_SrcWidth;
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const int m_SrcHeight;
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UnownedPtr<ScanlineComposerIface> const m_pDestBitmap;
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const int m_DestWidth;
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const int m_DestHeight;
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const FX_RECT m_DestClip;
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std::vector<uint8_t> m_DestScanline;
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std::vector<uint8_t> m_DestMaskScanline;
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std::vector<uint8_t> m_InterBuf;
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std::vector<uint8_t> m_ExtraAlphaBuf;
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FX_RECT m_SrcClip;
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int m_InterPitch;
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int m_ExtraMaskPitch;
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FXDIB_ResampleOptions m_ResampleOptions;
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TransformMethod m_TransMethod;
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State m_State = State::kInitial;
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int m_CurRow;
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CWeightTable m_WeightTable;
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};
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#endif // CORE_FXGE_DIB_CSTRETCHENGINE_H_
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