core/fxge/skia/fx_skia_device.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.

#ifndef CORE_FXGE_SKIA_FX_SKIA_DEVICE_H_
#define CORE_FXGE_SKIA_FX_SKIA_DEVICE_H_

#if defined _SKIA_SUPPORT_ || defined _SKIA_SUPPORT_PATHS_

#include <memory>
#include <vector>

#include "core/fxge/cfx_pathdata.h"
#include "core/fxge/ifx_renderdevicedriver.h"

class SkCanvas;
class SkMatrix;
class SkPaint;
class SkPath;
class SkPictureRecorder;
struct FXTEXT_CHARPOS;
struct SkIRect;

#ifdef _SKIA_SUPPORT_
class SkiaState;
#endif

class CFX_SkiaDeviceDriver : public IFX_RenderDeviceDriver {
 public:
  CFX_SkiaDeviceDriver(CFX_DIBitmap* pBitmap,
                       bool bRgbByteOrder,
                       CFX_DIBitmap* pOriDevice,
                       bool bGroupKnockout);
#ifdef _SKIA_SUPPORT_
  explicit CFX_SkiaDeviceDriver(SkPictureRecorder* recorder);
  CFX_SkiaDeviceDriver(int size_x, int size_y);
#endif
  ~CFX_SkiaDeviceDriver() override;

  /** Options */
  int GetDeviceCaps(int caps_id) const override;

  /** Save and restore all graphic states */
  void SaveState() override;
  void RestoreState(bool bKeepSaved) override;

  /** Set clipping path using filled region */
  bool SetClip_PathFill(
      const CFX_PathData* pPathData,     // path info
      const CFX_Matrix* pObject2Device,  // optional transformation
      int fill_mode) override;           // fill mode, WINDING or ALTERNATE

  /** Set clipping path using stroked region */
  bool SetClip_PathStroke(
      const CFX_PathData* pPathData,     // path info
      const CFX_Matrix* pObject2Device,  // optional transformation
      const CFX_GraphStateData*
          pGraphState)  // graphic state, for pen attributes
      override;

  /** Draw a path */
  bool DrawPath(const CFX_PathData* pPathData,
                const CFX_Matrix* pObject2Device,
                const CFX_GraphStateData* pGraphState,
                uint32_t fill_color,
                uint32_t stroke_color,
                int fill_mode,
                int blend_type) override;

  bool FillRectWithBlend(const FX_RECT* pRect,
                         uint32_t fill_color,
                         int blend_type) override;

  /** Draw a single pixel (device dependant) line */
  bool DrawCosmeticLine(FX_FLOAT x1,
                        FX_FLOAT y1,
                        FX_FLOAT x2,
                        FX_FLOAT y2,
                        uint32_t color,
                        int blend_type) override;

  bool GetClipBox(FX_RECT* pRect) override;

  /** Load device buffer into a DIB */
  bool GetDIBits(CFX_DIBitmap* pBitmap, int left, int top) override;

  CFX_DIBitmap* GetBackDrop() override;

  bool SetDIBits(const CFX_DIBSource* pBitmap,
                 uint32_t color,
                 const FX_RECT* pSrcRect,
                 int dest_left,
                 int dest_top,
                 int blend_type) override;
#ifdef _SKIA_SUPPORT_
  bool SetBitsWithMask(const CFX_DIBSource* pBitmap,
                       const CFX_DIBSource* pMask,
                       int dest_left,
                       int dest_top,
                       int bitmap_alpha,
                       int blend_type) override;
#endif

#ifdef _SKIA_SUPPORT_PATHS_
  void SetClipMask(const FX_RECT& clipBox, const SkPath& skClipPath);
#endif

  bool StretchDIBits(const CFX_DIBSource* pBitmap,
                     uint32_t color,
                     int dest_left,
                     int dest_top,
                     int dest_width,
                     int dest_height,
                     const FX_RECT* pClipRect,
                     uint32_t flags,
                     int blend_type) override;

  bool StartDIBits(const CFX_DIBSource* pBitmap,
                   int bitmap_alpha,
                   uint32_t color,
                   const CFX_Matrix* pMatrix,
                   uint32_t flags,
                   void*& handle,
                   int blend_type) override;

  bool ContinueDIBits(void* handle, IFX_Pause* pPause) override;

  void CancelDIBits(void* handle) override {}

  bool DrawBitsWithMask(const CFX_DIBSource* pBitmap,
                        const CFX_DIBSource* pMask,
                        int bitmap_alpha,
                        const CFX_Matrix* pMatrix,
                        int blend_type);

  bool DrawDeviceText(int nChars,
                      const FXTEXT_CHARPOS* pCharPos,
                      CFX_Font* pFont,
                      const CFX_Matrix* pObject2Device,
                      FX_FLOAT font_size,
                      uint32_t color) override;

  bool DrawShading(const CPDF_ShadingPattern* pPattern,
                   const CFX_Matrix* pMatrix,
                   const FX_RECT& clip_rect,
                   int alpha,
                   bool bAlphaMode) override;

  virtual uint8_t* GetBuffer() const;

  void PaintStroke(SkPaint* spaint,
                   const CFX_GraphStateData* pGraphState,
                   const SkMatrix& matrix);
  void Clear(uint32_t color);
  void Flush() override;
  SkPictureRecorder* GetRecorder() const { return m_pRecorder; }
  void PreMultiply() { m_pBitmap->PreMultiply(); }
  static void PreMultiply(CFX_DIBitmap* pDIBitmap);
  SkCanvas* SkiaCanvas() { return m_pCanvas; }
  void DebugVerifyBitmapIsPreMultiplied() const;
  void Dump() const;

 private:
  friend class SkiaState;

  CFX_DIBitmap* m_pBitmap;
  CFX_DIBitmap* m_pOriDevice;
  SkCanvas* m_pCanvas;
  SkPictureRecorder* const m_pRecorder;
  std::unique_ptr<SkiaState> m_pCache;
#ifdef _SKIA_SUPPORT_PATHS_
  std::unique_ptr<CFX_ClipRgn> m_pClipRgn;
  std::vector<std::unique_ptr<CFX_ClipRgn>> m_StateStack;
  int m_FillFlags;
  bool m_bRgbByteOrder;
#endif
  bool m_bGroupKnockout;
};
#endif  // defined _SKIA_SUPPORT_ || defined _SKIA_SUPPORT_PATHS_

#endif  // CORE_FXGE_SKIA_FX_SKIA_DEVICE_H_