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// Copyright 2017 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_FXGE_DIB_CSTRETCHENGINE_H_
#define CORE_FXGE_DIB_CSTRETCHENGINE_H_
#include <vector>
#include "core/fxcrt/fx_coordinates.h"
#include "core/fxcrt/retain_ptr.h"
#include "core/fxcrt/unowned_ptr.h"
#include "core/fxge/fx_dib.h"
class PauseIndicatorIface;
class ScanlineComposerIface;
class CStretchEngine {
public:
CStretchEngine(ScanlineComposerIface* pDestBitmap,
FXDIB_Format dest_format,
int dest_width,
int dest_height,
const FX_RECT& clip_rect,
const RetainPtr<CFX_DIBBase>& pSrcBitmap,
int flags);
~CStretchEngine();
bool Continue(PauseIndicatorIface* pPause);
bool StartStretchHorz();
bool ContinueStretchHorz(PauseIndicatorIface* pPause);
void StretchVert();
class CWeightTable {
public:
CWeightTable();
~CWeightTable();
bool Calc(int dest_len,
int dest_min,
int dest_max,
int src_len,
int src_min,
int src_max,
int flags);
const PixelWeight* GetPixelWeight(int pixel) const;
PixelWeight* GetPixelWeight(int pixel) {
return const_cast<PixelWeight*>(
static_cast<const CWeightTable*>(this)->GetPixelWeight(pixel));
}
int* GetValueFromPixelWeight(PixelWeight* pWeight, int index) const;
size_t GetPixelWeightSize() const;
private:
int m_DestMin;
int m_ItemSize;
std::vector<uint8_t> m_WeightTables;
size_t m_dwWeightTablesSize;
};
enum class State : uint8_t { kInitial, kHorizontal, kVertical };
enum class TransformMethod : uint8_t {
k1BppTo8Bpp,
k1BppToManyBpp,
k8BppTo8Bpp,
k8BppTo8BppWithAlpha,
k8BppToManyBpp,
k8BppToManyBppWithAlpha,
kManyBpptoManyBpp,
kManyBpptoManyBppWithAlpha
};
const FXDIB_Format m_DestFormat;
const int m_DestBpp;
const int m_SrcBpp;
const int m_bHasAlpha;
RetainPtr<CFX_DIBBase> const m_pSource;
const uint32_t* m_pSrcPalette;
const int m_SrcWidth;
const int m_SrcHeight;
UnownedPtr<ScanlineComposerIface> const m_pDestBitmap;
const int m_DestWidth;
const int m_DestHeight;
const FX_RECT m_DestClip;
std::vector<uint8_t> m_DestScanline;
std::vector<uint8_t> m_DestMaskScanline;
std::vector<uint8_t> m_InterBuf;
std::vector<uint8_t> m_ExtraAlphaBuf;
FX_RECT m_SrcClip;
int m_InterPitch;
int m_ExtraMaskPitch;
int m_Flags;
TransformMethod m_TransMethod;
State m_State = State::kInitial;
int m_CurRow;
CWeightTable m_WeightTable;
};
#endif // CORE_FXGE_DIB_CSTRETCHENGINE_H_
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