| // Copyright 2017 The PDFium Authors |
| // 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 <stdint.h> |
| |
| #include "core/fxcrt/data_vector.h" |
| #include "core/fxcrt/fixed_try_alloc_zeroed_data_vector.h" |
| #include "core/fxcrt/fx_coordinates.h" |
| #include "core/fxcrt/fx_system.h" |
| #include "core/fxcrt/retain_ptr.h" |
| #include "core/fxcrt/unowned_ptr.h" |
| #include "core/fxge/dib/fx_dib.h" |
| #include "third_party/base/check_op.h" |
| #include "third_party/base/containers/span.h" |
| |
| class CFX_DIBBase; |
| class PauseIndicatorIface; |
| class ScanlineComposerIface; |
| |
| class CStretchEngine { |
| public: |
| static constexpr uint32_t kFixedPointBits = 16; |
| static constexpr uint32_t kFixedPointOne = 1 << kFixedPointBits; |
| |
| static inline uint32_t FixedFromDouble(double d) { |
| return static_cast<uint32_t>(FXSYS_round(d * kFixedPointOne)); |
| } |
| |
| static inline uint32_t FixedFromFloat(float f) { |
| return static_cast<uint32_t>(FXSYS_roundf(f * kFixedPointOne)); |
| } |
| |
| static inline uint8_t PixelFromFixed(uint32_t fixed) { |
| return static_cast<uint8_t>(fixed >> kFixedPointBits); |
| } |
| |
| // Indicates whether to manually set interpolate bilinear option to true to |
| // achieve a smoother rendering results. |
| static bool UseInterpolateBilinear(const FXDIB_ResampleOptions& options, |
| int dest_width, |
| int dest_height, |
| int src_width, |
| int src_height); |
| |
| struct PixelWeight { |
| static size_t TotalBytesForWeightCount(size_t weight_count); |
| |
| void SetStartEnd(int src_start, int src_end, size_t weight_count) { |
| CHECK_LT(src_end - src_start, static_cast<int>(weight_count)); |
| m_SrcStart = src_start; |
| m_SrcEnd = src_end; |
| } |
| |
| uint32_t GetWeightForPosition(int position) const { |
| CHECK_GE(position, m_SrcStart); |
| CHECK_LE(position, m_SrcEnd); |
| return m_Weights[position - m_SrcStart]; |
| } |
| |
| void SetWeightForPosition(int position, uint32_t weight) { |
| CHECK_GE(position, m_SrcStart); |
| CHECK_LE(position, m_SrcEnd); |
| m_Weights[position - m_SrcStart] = weight; |
| } |
| |
| // NOTE: relies on defined behaviour for unsigned overflow to |
| // decrement the previous position, as needed. |
| void RemoveLastWeightAndAdjust(uint32_t weight_change) { |
| CHECK_GT(m_SrcEnd, m_SrcStart); |
| --m_SrcEnd; |
| m_Weights[m_SrcEnd - m_SrcStart] += weight_change; |
| } |
| |
| int m_SrcStart; |
| int m_SrcEnd; // Note: inclusive, [0, -1] for empty range at 0. |
| uint32_t m_Weights[1]; // Not really 1, variable size. |
| }; |
| |
| class WeightTable { |
| public: |
| WeightTable(); |
| ~WeightTable(); |
| |
| // Accepts a negative `dest_len` argument, producing a "mirror |
| // image" of the result if `dest_len` is negative. |
| bool CalculateWeights(int dest_len, |
| int dest_min, |
| int dest_max, |
| int src_len, |
| int src_min, |
| int src_max, |
| const FXDIB_ResampleOptions& options); |
| |
| const PixelWeight* GetPixelWeight(int pixel) const; |
| PixelWeight* GetPixelWeight(int pixel); |
| |
| private: |
| int m_DestMin = 0; |
| size_t m_ItemSizeBytes = 0; |
| size_t m_WeightTablesSizeBytes = 0; |
| DataVector<uint8_t> m_WeightTables; |
| }; |
| |
| CStretchEngine(ScanlineComposerIface* pDestBitmap, |
| FXDIB_Format dest_format, |
| int dest_width, |
| int dest_height, |
| const FX_RECT& clip_rect, |
| const RetainPtr<const CFX_DIBBase>& pSrcBitmap, |
| const FXDIB_ResampleOptions& options); |
| ~CStretchEngine(); |
| |
| bool Continue(PauseIndicatorIface* pPause); |
| bool StartStretchHorz(); |
| bool ContinueStretchHorz(PauseIndicatorIface* pPause); |
| void StretchVert(); |
| |
| const FXDIB_ResampleOptions& GetResampleOptionsForTest() const { |
| return m_ResampleOptions; |
| } |
| |
| private: |
| enum class State : uint8_t { kInitial, kHorizontal, kVertical }; |
| |
| enum class TransformMethod : uint8_t { |
| k1BppTo8Bpp, |
| k1BppToManyBpp, |
| k8BppTo8Bpp, |
| k8BppToManyBpp, |
| kManyBpptoManyBpp, |
| kManyBpptoManyBppWithAlpha |
| }; |
| |
| const FXDIB_Format m_DestFormat; |
| const int m_DestBpp; |
| const int m_SrcBpp; |
| const bool m_bHasAlpha; |
| RetainPtr<const CFX_DIBBase> const m_pSource; |
| pdfium::span<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; |
| DataVector<uint8_t> m_DestScanline; |
| FixedTryAllocZeroedDataVector<uint8_t> m_InterBuf; |
| FX_RECT m_SrcClip; |
| int m_InterPitch; |
| int m_ExtraMaskPitch; |
| FXDIB_ResampleOptions m_ResampleOptions; |
| TransformMethod m_TransMethod; |
| State m_State = State::kInitial; |
| int m_CurRow = 0; |
| WeightTable m_WeightTable; |
| }; |
| |
| #endif // CORE_FXGE_DIB_CSTRETCHENGINE_H_ |