PDFium - CFX_RenderDevice
越开畅
// Copyright 2016 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_CFX_RENDERDEVICE_H_
#define CORE_FXGE_CFX_RENDERDEVICE_H_
#include <memory>
#include <vector>
#include "build/build_config.h"
#include "core/fxcrt/fx_coordinates.h"
#include "core/fxcrt/unowned_ptr.h"
#include "core/fxge/fx_dib.h"
#include "core/fxge/render_defines.h"
#include "core/fxge/renderdevicedriver_iface.h"
class CFX_DIBBase;
class CFX_DIBitmap;
class CFX_Font;
class CFX_GraphStateData;
class CFX_ImageRenderer;
class CFX_PathData;
class PauseIndicatorIface;
class TextCharPos;
struct CFX_Color;
struct CFX_FillRenderOptions;
struct CFX_TextRenderOptions;
enum class BorderStyle { kSolid, kDash, kBeveled, kInset, kUnderline };
// Base class for all render devices. Derived classes must call
// SetDeviceDriver() to fully initialize the class. Until then, class methods
// are not safe to call, or may return invalid results.
class CFX_RenderDevice {
public:
class StateRestorer {
public:
explicit StateRestorer(CFX_RenderDevice* pDevice);
~StateRestorer();
private:
UnownedPtr<CFX_RenderDevice> m_pDevice;
};
virtual ~CFX_RenderDevice();
static CFX_Matrix GetFlipMatrix(float width,
float height,
float left,
float top);
RenderDeviceDriverIface* GetDeviceDriver() const {
return m_pDeviceDriver.get();
}
void SaveState();
void RestoreState(bool bKeepSaved);
int GetWidth() const { return m_Width; }
int GetHeight() const { return m_Height; }
DeviceType GetDeviceType() const { return m_DeviceType; }
int GetRenderCaps() const { return m_RenderCaps; }
int GetDeviceCaps(int id) const;
RetainPtr<CFX_DIBitmap> GetBitmap() const;
void SetBitmap(const RetainPtr<CFX_DIBitmap>& pBitmap);
bool CreateCompatibleBitmap(const RetainPtr<CFX_DIBitmap>& pDIB,
int width,
int height) const;
const FX_RECT& GetClipBox() const { return m_ClipBox; }
void SetBaseClip(const FX_RECT& rect);
bool SetClip_PathFill(const CFX_PathData* pPathData,
const CFX_Matrix* pObject2Device,
const CFX_FillRenderOptions& fill_options);
bool SetClip_PathStroke(const CFX_PathData* pPathData,
const CFX_Matrix* pObject2Device,
const CFX_GraphStateData* pGraphState);
bool SetClip_Rect(const FX_RECT& pRect);
bool DrawPath(const CFX_PathData* pPathData,
const CFX_Matrix* pObject2Device,
const CFX_GraphStateData* pGraphState,
uint32_t fill_color,
uint32_t stroke_color,
const CFX_FillRenderOptions& fill_options);
bool DrawPathWithBlend(const CFX_PathData* pPathData,
const CFX_Matrix* pObject2Device,
const CFX_GraphStateData* pGraphState,
uint32_t fill_color,
uint32_t stroke_color,
const CFX_FillRenderOptions& fill_options,
BlendMode blend_type);
bool FillRect(const FX_RECT& rect, uint32_t color) {
return FillRectWithBlend(rect, color, BlendMode::kNormal);
}
RetainPtr<CFX_DIBitmap> GetBackDrop();
bool GetDIBits(const RetainPtr<CFX_DIBitmap>& pBitmap, int left, int top);
bool SetDIBits(const RetainPtr<CFX_DIBBase>& pBitmap, int left, int top) {
return SetDIBitsWithBlend(pBitmap, left, top, BlendMode::kNormal);
}
bool SetDIBitsWithBlend(const RetainPtr<CFX_DIBBase>& pBitmap,
int left,
int top,
BlendMode blend_mode);
bool StretchDIBits(const RetainPtr<CFX_DIBBase>& pBitmap,
int left,
int top,
int dest_width,
int dest_height) {
return StretchDIBitsWithFlagsAndBlend(pBitmap, left, top, dest_width,
dest_height, FXDIB_ResampleOptions(),
BlendMode::kNormal);
}
bool StretchDIBitsWithFlagsAndBlend(const RetainPtr<CFX_DIBBase>& pBitmap,
int left,
int top,
int dest_width,
int dest_height,
const FXDIB_ResampleOptions& options,
BlendMode blend_mode);
bool SetBitMask(const RetainPtr<CFX_DIBBase>& pBitmap,
int left,
int top,
uint32_t argb);
bool StretchBitMask(const RetainPtr<CFX_DIBBase>& pBitmap,
int left,
int top,
int dest_width,
int dest_height,
uint32_t color);
bool StretchBitMaskWithFlags(const RetainPtr<CFX_DIBBase>& pBitmap,
int left,
int top,
int dest_width,
int dest_height,
uint32_t argb,
const FXDIB_ResampleOptions& options);
bool StartDIBits(const RetainPtr<CFX_DIBBase>& pBitmap,
int bitmap_alpha,
uint32_t color,
const CFX_Matrix& matrix,
const FXDIB_ResampleOptions& options,
std::unique_ptr<CFX_ImageRenderer>* handle) {
return StartDIBitsWithBlend(pBitmap, bitmap_alpha, color, matrix, options,
handle, BlendMode::kNormal);
}
bool StartDIBitsWithBlend(const RetainPtr<CFX_DIBBase>& pBitmap,
int bitmap_alpha,
uint32_t argb,
const CFX_Matrix& matrix,
const FXDIB_ResampleOptions& options,
std::unique_ptr<CFX_ImageRenderer>* handle,
BlendMode blend_mode);
bool ContinueDIBits(CFX_ImageRenderer* handle, PauseIndicatorIface* pPause);
bool DrawNormalText(int nChars,
const TextCharPos* pCharPos,
CFX_Font* pFont,
float font_size,
const CFX_Matrix& mtText2Device,
uint32_t fill_color,
const CFX_TextRenderOptions& options);
bool DrawTextPath(int nChars,
const TextCharPos* pCharPos,
CFX_Font* pFont,
float font_size,
const CFX_Matrix& mtText2User,
const CFX_Matrix* pUser2Device,
const CFX_GraphStateData* pGraphState,
uint32_t fill_color,
uint32_t stroke_color,
CFX_PathData* pClippingPath,
const CFX_FillRenderOptions& fill_options);
void DrawFillRect(const CFX_Matrix* pUser2Device,
const CFX_FloatRect& rect,
const CFX_Color& color,
int32_t nTransparency);
void DrawFillRect(const CFX_Matrix* pUser2Device,
const CFX_FloatRect& rect,
const FX_COLORREF& color);
void DrawStrokeRect(const CFX_Matrix& mtUser2Device,
const CFX_FloatRect& rect,
const FX_COLORREF& color,
float fWidth);
void DrawStrokeLine(const CFX_Matrix* pUser2Device,
const CFX_PointF& ptMoveTo,
const CFX_PointF& ptLineTo,
const FX_COLORREF& color,
float fWidth);
void DrawBorder(const CFX_Matrix* pUser2Device,
const CFX_FloatRect& rect,
float fWidth,
const CFX_Color& color,
const CFX_Color& crLeftTop,
const CFX_Color& crRightBottom,
BorderStyle nStyle,
int32_t nTransparency);
void DrawFillArea(const CFX_Matrix& mtUser2Device,
const std::vector<CFX_PointF>& points,
const FX_COLORREF& color);
void DrawShadow(const CFX_Matrix& mtUser2Device,
bool bVertical,
bool bHorizontal,
const CFX_FloatRect& rect,
int32_t nTransparency,
int32_t nStartGray,
int32_t nEndGray);
#if defined(_SKIA_SUPPORT_)
virtual void DebugVerifyBitmapIsPreMultiplied() const;
virtual bool SetBitsWithMask(const RetainPtr<CFX_DIBBase>& pBitmap,
const RetainPtr<CFX_DIBBase>& pMask,
int left,
int top,
int bitmap_alpha,
BlendMode blend_type);
#endif
#if defined(_SKIA_SUPPORT_) || defined(_SKIA_SUPPORT_PATHS_)
void Flush(bool release);
#endif
protected:
CFX_RenderDevice();
void SetDeviceDriver(std::unique_ptr<RenderDeviceDriverIface> pDriver);
private:
void InitDeviceInfo();
void UpdateClipBox();
bool DrawFillStrokePath(const CFX_PathData* pPathData,
const CFX_Matrix* pObject2Device,
const CFX_GraphStateData* pGraphState,
uint32_t fill_color,
uint32_t stroke_color,
const CFX_FillRenderOptions& fill_options,
BlendMode blend_type);
bool DrawCosmeticLine(const CFX_PointF& ptMoveTo,
const CFX_PointF& ptLineTo,
uint32_t color,
const CFX_FillRenderOptions& fill_options,
BlendMode blend_type);
bool FillRectWithBlend(const FX_RECT& rect,
uint32_t color,
BlendMode blend_type);
RetainPtr<CFX_DIBitmap> m_pBitmap;
int m_Width = 0;
int m_Height = 0;
int m_bpp = 0;
int m_RenderCaps = 0;
DeviceType m_DeviceType = DeviceType::kDisplay;
FX_RECT m_ClipBox;
std::unique_ptr<RenderDeviceDriverIface> m_pDeviceDriver;
};
#endif // CORE_FXGE_CFX_RENDERDEVICE_H_
CFX_RenderDevice 持有一个RenderDeviceDriver，从RenderDeviceDriverIface继承。
CFX_WindowsRenderDevice ： 用于Windows平台的渲染设备驱动
CGdiDeviceDriver ： Gdi方式的渲染设备驱动
CPSPrinterDriver：用于打印的设备驱动
CTextOnlyPrinterDriver ： 仅打印文本的设备驱动
CFX_SkiaDeviceDriver： 使用Skia库的设备驱动
CFX_AggDeviceDriver： 使用Agg库的设备驱动
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