#ifndef _CD
2DC_H_
#define _CD
2DC_H_
#define _CRT_SECURE_NO_WARNINGS
#define NO_WARN_MBCS_MFC_DEPRECATION
#include <SDKDDKVer.h>
#include <afxwin.h>
#include <d
2d1.h>
#include <dwrite.h>
#include <wincodec.h>
#include <unordered_map>
namespace MFCEx
{
/**
* @class CD
2DC
* @brief 封装Direct
2D渲染功能的类，用于在MFC应用中实现硬件加速的
2D图形渲染
*/
class CD
2DC final//禁止继承
{
enum ResourceType
{
BRUSH,
BITMAP,
TEXT_FORMAT,
GEOMETRY
};
using ResourceMap = std
::unordered_map<IUnknown*, ResourceType>;
public
:
CD
2DC();
~CD
2DC();
/**
* @brief 初始化Direct
2D资源
* @param _pWnd [in] 关联的MFC窗口指针
* @param _iWidth [in] 渲染区域的宽度（像素）
* @param _iHeight [in] 渲染区域的高度（像素）
* @return BOOL 初始化成功返回TRUE，失败返回FALSE
*/
BOOL Initialize
(CWnd* _pWnd, const size_t _iWidth, const size_t _iHeight
);
/**
* @brief 调整渲染区域大小
* @param _iWidth [in] 新的渲染区域宽度（像素）
* @param _iHeight [in] 新的渲染区域高度（像素）
* @return BOOL 调整成功返回TRUE，失败返回FALSE
*/
BOOL Resize
(const size_t _iWidth, const size_t _iHeight
);
/**
* @brief 开始绘制操作（必须在绘制前调用）
*/
void BeginDraw
();
/**
* @brief 结束绘制操作（必须在绘制后调用）
*/
void EndDraw
();
FLOAT GetDpiX
() const;
FLOAT GetDpiY
() const;
size_t GetLogicalWidth
() const;
size_t GetLogicalHeight
() const;
inline void Release
(IUnknown* pResource
);
ID
2D1Bitmap* CreateBitmap
(UINT _nWidth, UINT _nHeight, UINT _nRGBA = 4
);
private
:
/**
* @brief 创建Direct
2D渲染目标
* @return BOOL 创建成功返回TRUE，失败返回FALSE
*/
BOOL CreateRenderTarget
();
void Clear
();
void RecreateResources
();
void UpdateWindowDpi
();
// 需要添加资源注册接口
void RegisterResource
(IUnknown* pResource, ResourceType Type
);
// 资源注销接口
void UnregisterResource
(IUnknown* pResource
);
private
:
CWnd* m_pWnd = nullptr; //< 关联的MFC窗口指针
size_t m_iLogicalWidth = 0; // 逻辑尺寸
size_t m_iLogicalHeight = 0;
FLOAT m_fDpiX = 96.0f; // DPI 值
FLOAT m_fDpiY = 96.0f;
ID
2D1Factory* m_pFactory = nullptr; ///< Direct
2D工厂接口
ID
2D1HwndRenderTarget* m_pTarget = nullptr; //< 窗口渲染目标接口
IDWriteFactory* m_pWriteFactory = nullptr; //< DirectWrite文本工厂接口
bool m_bInitialized = false; ///< 初始化状态标志
ResourceMap m_Map;//资源管理集
};
}
#endif // !_CD
2DC_H_
#include "CD
2DC.h"
#pragma comment
(lib, "d
2d1.lib"
)
#pragma comment
(lib, "dwrite.lib"
)
//#include <ShellScalingApi.h> // 包含GetDpiForMonitor的头文件
//#pragma comment
(lib, "Shcore.lib"
) // 链接Shcore.lib库
// 3. 添加资源安全释放宏
#define SAFE_RELEASE
(p
) { if
(p
) { p->Release
(); p = nullptr; } }
/**
* @brief 构造
函数（初始化成员变量）
*/
MFCEx
::CD
2DC::CD
2DC()
{
}
/**
* @brief 析构
函数（释放所有Direct
2D资源）
*/
MFCEx
::CD
2DC::~CD
2DC()
{
Clear
();
}
void MFCEx
::CD
2DC::Clear
()
{
for
(ResourceMap
::iterator it = m_Map.begin
(); it != m_Map.end
(); ++it
)
{
it->first->Release
();
}
m_Map.clear
();
SAFE_RELEASE
(m_pTarget
);
SAFE_RELEASE
(m_pFactory
);
SAFE_RELEASE
(m_pWriteFactory
);
}
/**
* @brief 初始化Direct
2D资源
* @param _pWnd [in] 关联的MFC窗口指针
* @param _iWidth [in] 渲染区域的宽度（像素）
* @param _iHeight [in] 渲染区域的高度（像素）
* @return BOOL 初始化成功返回TRUE，失败返回FALSE
*/
BOOL MFCEx
::CD
2DC::Initialize
(CWnd* _pWnd, const size_t _iWidth, const size_t _iHeight
)
{
// 验证窗口句柄有效性
if
(!_pWnd || !_pWnd->GetSafeHwnd
()) return FALSE;
// 创建Direct
2D工厂
HRESULT hr = D
2D1CreateFactory
(D
2D1_FACTORY_TYPE_SINGLE_THREADED, &m_pFactory
);
if
(FAILED
(hr
)) return FALSE;
// 创建DirectWrite工厂
hr = DWriteCreateFactory
(
DWRITE_FACTORY_TYPE_SHARED,
__uuidof
(IDWriteFactory
),
reinterpret_cast<IUnknown**>
(&m_pWriteFactory
)
);
if
(FAILED
(hr
)) return FALSE;
// 设置成员变量
m_pWnd = _pWnd;
// DPI 感知处理
UpdateWindowDpi
(); // 替换原有的GetDesktopDpi调用
m_iLogicalWidth = _iWidth; // 存储逻辑尺寸
m_iLogicalHeight = _iHeight;
// 创建渲染目标
if
(!CreateRenderTarget
())
{
SAFE_RELEASE
(m_pWriteFactory
);
SAFE_RELEASE
(m_pFactory
);
return FALSE;
}
m_bInitialized = TRUE;
return TRUE;
}
/**
* @brief 调整渲染区域大小
* @param _iWidth [in] 新的渲染区域宽度（像素）
* @param _iHeight [in] 新的渲染区域高度（像素）
* @return BOOL 调整成功返回TRUE，失败返回FALSE
*/
BOOL MFCEx
::CD
2DC::Resize
(const size_t _iWidth, const size_t _iHeight
)
{
if
(!m_pTarget
) return FALSE;
// 更新 DPI 值
UpdateWindowDpi
(); // 替换原有的GetDesktopDpi调用
m_iLogicalWidth = _iWidth;
m_iLogicalHeight = _iHeight;
size_t physWidth = static_cast<size_t>
(_iWidth * m_fDpiX / 96.0f
);
size_t physHeight = static_cast<size_t>
(_iHeight * m_fDpiY / 96.0f
);
D
2D1_SIZE_U size = D
2D1
::SizeU
(physWidth, physHeight
);
return SUCCEEDED
(m_pTarget->Resize
(size
));
}
/**
* @brief 开始绘制操作（必须在绘制前调用）
*/
void MFCEx
::CD
2DC::BeginDraw
()
{
if
(m_pTarget
) m_pTarget->BeginDraw
();
}
/**
* @brief 结束绘制操作（必须在绘制后调用）
*/
void MFCEx
::CD
2DC::EndDraw
()
{
if
(!m_pTarget
) return;
if
(D
2DERR_RECREATE_TARGET == m_pTarget->EndDraw
())
{
SAFE_RELEASE
(m_pTarget
);
if
(CreateRenderTarget
())
{
RecreateResources
(); // 触发资源重建
}
}
}
/**
* @brief 创建Direct
2D渲染目标
* @return BOOL 创建成功返回TRUE，失败返回FALSE
*/
BOOL MFCEx
::CD
2DC::CreateRenderTarget
()
{
// 验证工厂
和窗口有效性
if
(!m_pFactory || !m_pWnd
) return FALSE;
// 创建窗口渲染目标
D
2D1_PIXEL_FORMAT pixelFormat = D
2D1
::PixelFormat
(
DXGI_FORMAT_B8G8R8A8_UNORM,
D
2D1_ALPHA_MODE_IGNORE
);
D
2D1_RENDER_TARGET_PROPERTIES rtProps = D
2D1
::RenderTargetProperties
(
D
2D1_RENDER_TARGET_TYPE_DEFAULT,
pixelFormat
);
size_t physWidth = static_cast<size_t>
(m_iLogicalWidth * m_fDpiX / 96.0f
);
size_t physHeight = static_cast<size_t>
(m_iLogicalHeight * m_fDpiY / 96.0f
);
HRESULT hr = m_pFactory->CreateHwndRenderTarget
(
rtProps, // 使用自定义属性
D
2D1
::HwndRenderTargetProperties
(m_pWnd->GetSafeHwnd
(), D
2D1
::SizeU
(physWidth, physHeight
)),
&m_pTarget
);
return SUCCEEDED
(hr
);
}
FLOAT MFCEx
::CD
2DC::GetDpiX
() const
{
return m_fDpiX;
}
FLOAT MFCEx
::CD
2DC::GetDpiY
() const
{
return m_fDpiY;
}
size_t MFCEx
::CD
2DC::GetLogicalWidth
() const
{
return m_iLogicalWidth;
}
size_t MFCEx
::CD
2DC::GetLogicalHeight
() const
{
return m_iLogicalHeight;
}
void MFCEx
::CD
2DC::RecreateResources
()
{
for
(ResourceMap
::iterator it = m_Map.begin
(); it != m_Map.end
(); ++it
)
{
}
}
void MFCEx
::CD
2DC::UpdateWindowDpi
()
{
if
(!m_pWnd
) return;
// 获取窗口DPI（Windows 10以上使用GetDpiForWindow）
m_fDpiX = static_cast<FLOAT>
(GetDpiForWindow
(m_pWnd->GetSafeHwnd
()));
m_fDpiY = static_cast<FLOAT>
(GetDpiForWindow
(m_pWnd->GetSafeHwnd
()));
// 如果获取失败，则回退到GetDeviceCaps方式
if
(m_fDpiX == 0 || m_fDpiY == 0
)
{
const H
DC h
dc =
::Get
DC(m_pWnd->GetSafeHwnd
());
m_fDpiX = static_cast<FLOAT>
(GetDeviceCaps
(h
dc, LOGPIXELSX
));
m_fDpiY = static_cast<FLOAT>
(GetDeviceCaps
(h
dc, LOGPIXELSY
));
::Release
DC(m_pWnd->GetSafeHwnd
(), h
dc);
}
}
// 需要添加资源注册接口
void MFCEx
::CD
2DC::RegisterResource
(IUnknown* pResource, ResourceType Type
)
{
if
(!pResource
) return;
// 检查资源是否已注册（避免重复注册）
auto it = m_Map.find
(pResource
);
if
(it != m_Map.end
())
{
// 已存在则更新类型（实际开发中应记录日志）
//it->second = Type;
return;
}
// 添加新资源引用计数
pResource->AddRef
();
m_Map.emplace
(pResource, Type
);
}
// 资源注销接口
void MFCEx
::CD
2DC::UnregisterResource
(IUnknown* pResource
)
{
if
(!pResource
) return;
auto it = m_Map.find
(pResource
);
if
(it != m_Map.end
())
{
// 释放资源并移除映射
it->first->Release
();
m_Map.erase
(it
);
}
}
inline void MFCEx
::CD
2DC::Release
(IUnknown* pResource
)
{
UnregisterResource
(pResource
);
}
ID
2D1Bitmap* MFCEx
::CD
2DC::CreateBitmap
(UINT _nWidth, UINT _nHeight, UINT _nRGBA
)
{
D
2D1_SIZE_U size = { _nWidth, _nHeight };
D
2D1_BITMAP_PROPERTIES props =
{
{ DXGI_FORMAT_R8G8B8A8_UNORM,
(_nRGBA == 4
) ? D
2D1_ALPHA_MODE_FORCE_DWORD
: (D
2D1_ALPHA_MODE
)(_nRGBA
) },
m_fDpiX,
m_fDpiY
};
ID
2D1Bitmap* bitmap;
HRESULT hr = m_pTarget->CreateBitmap
(size, nullptr, _nWidth*_nRGBA, props, &bitmap
);
if
(FAILED
(hr
))return NULL;
return bitmap;
}
着重帮我分析CreateBitmap的完整性
本文介绍了使用MFC进行绘图的基本操作，包括获取设备上下文（DC）、释放设备上下文、绘制线条、选择绘图对象（如画笔、刷子、位图等），以及填充和绘制矩形的方法。
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