優化Duilib圖片屬性解析代碼，提升繪製效率

轉載請說明原出處，謝謝~·http://blog.csdn.net/zhuhongshu/article/details/51245751

         好長時間沒寫duilib博客了，最近在寫畢業設計，畢設的軟件界面自然就用比較熟悉的Duilib來搞了，正好把Duilib的一些地方一起改改。

         Duilib的圖片繪製代碼中有個影響性能的地方，所有的控件的圖片繪製都是調用CControlUI的DrawImage函數，而此函數調用了CRenderEngine的DrawImageString函數。在繪製圖片時，DrawImageString會解析圖片字符串的屬性，然後找到對片的HBITMAP資源，最後調用真正的繪圖函數去繪製。問題就在於每繪製一個圖片都會再次解析一次字符串，當界面比較複雜，而且圖片字符串也比較複雜時，這個解析的過程就影響了程序效率。

         實際上這個字符串在被賦值後，只需要解析一次，然後緩存起來就可以了，在繪製圖片時直接用緩存好的圖片屬性數據。使用內存換效率的方法可以進一步提高Duilib的效率。

        寫了一個圖片屬性解析類，代替原本的圖片字符串，並且去掉了原本的DrawImageString函數。

class UILIB_API CImageAttribute
{
public:
	CImageAttribute();
	CImageAttribute(const CImageAttribute&);
	const CImageAttribute& operator=(const CImageAttribute&);
	virtual ~CImageAttribute();

    CDuiString GetAttributeString() const;
	void SetAttributeString(LPCTSTR pStrImageAttri);
	void ModifyAttribute(LPCTSTR pStrModify);
	bool LoadImage(CPaintManagerUI* pManager);
	bool IsLoadSuccess();

	operator LPCTSTR() const;
	bool operator ==(LPCTSTR pStrImage) const;
	const CDuiString& operator=(const CDuiString& src);
	const CDuiString& operator=(const TCHAR ch);
	const CDuiString& operator=(LPCTSTR pstr);
private:
	void Clone(const CImageAttribute&);
	void Clear();
	void ParseAttribute(LPCTSTR pStrImageAttri);

protected:
	friend class CRenderEngine;
	CDuiString	m_sImageAttribute;

	CDuiString	m_sImage;
	CDuiString	m_sResType;
	TImageInfo	*m_imageInfo;
	bool		m_bLoadSuccess;

	RECT	m_rcDest;
	RECT	m_rcSource;
	RECT	m_rcCorner;
	BYTE	m_bFade;
	DWORD	m_dwMask;
	bool	m_bHole;
	bool	m_bTiledX;
	bool	m_bTiledY;

};

	CImageAttribute::CImageAttribute()
	{
		Clear();
	}

	CImageAttribute::CImageAttribute(const CImageAttribute& image)
	{
		Clone(image);
	}

	const CImageAttribute& CImageAttribute::operator=(const CImageAttribute& image)
	{
		Clone(image);
		return *this;
	}

	void CImageAttribute::Clone(const CImageAttribute& image)
	{
		m_sImageAttribute = image.m_sImageAttribute;

		m_sImage = image.m_sImage;
		m_sResType = image.m_sResType;
		m_imageInfo = image.m_imageInfo;
		m_bLoadSuccess = image.m_bLoadSuccess;

		m_rcDest = image.m_rcDest;
		m_rcSource = image.m_rcSource;
		m_rcCorner = image.m_rcCorner;
		m_bFade = image.m_bFade;
		m_dwMask = image.m_dwMask;
		m_bHole = image.m_bHole;
		m_bTiledX = image.m_bTiledX;
		m_bTiledY = image.m_bTiledY;
	}

	CImageAttribute::~CImageAttribute()
	{

	}

	CDuiString CImageAttribute::GetAttributeString() const
	{
		return m_sImageAttribute;
	}

	void CImageAttribute::SetAttributeString(LPCTSTR pStrImageAttri)
	{
		if (m_sImageAttribute == pStrImageAttri)
			return;

		Clear();

		m_sImageAttribute = pStrImageAttri;
		m_sImage = m_sImageAttribute;
		ParseAttribute(pStrImageAttri);
	}

	bool CImageAttribute::LoadImage(CPaintManagerUI* pManager)
	{
		if (m_imageInfo != NULL)
			return true;
		if (!m_bLoadSuccess)
			return false;

		const TImageInfo* data = NULL;
		if (m_sResType.IsEmpty())
		{
			data = pManager->GetImageEx((LPCTSTR)m_sImage, NULL, m_dwMask);
		}
		else
		{
			data = pManager->GetImageEx((LPCTSTR)m_sImage, (LPCTSTR)m_sResType, m_dwMask);
		}
		if (data == NULL)
		{
			m_bLoadSuccess = false;
			return false;
		}
		else
		{
			m_bLoadSuccess = true;
		}
		
		if (m_rcSource.left == 0 && m_rcSource.right == 0 && m_rcSource.top == 0 && m_rcSource.bottom == 0)
		{
			m_rcSource.right = data->nX;
			m_rcSource.bottom = data->nY;
		}
		if (m_rcSource.right > data->nX) m_rcSource.right = data->nX;
		if (m_rcSource.bottom > data->nY) m_rcSource.bottom = data->nY;
		m_imageInfo = const_cast<TImageInfo*>(data);

		return true;
	}

	bool CImageAttribute::IsLoadSuccess()
	{
		return !m_sImageAttribute.IsEmpty() && m_bLoadSuccess;
	}

	void CImageAttribute::ModifyAttribute(LPCTSTR pStrModify)
	{
		ParseAttribute(pStrModify);
	}

	void CImageAttribute::Clear()
	{
		m_sImageAttribute.Empty();
		m_sImage.Empty();
		m_sResType.Empty();
		m_imageInfo = NULL;
		m_bLoadSuccess = true;
		ZeroMemory(&m_rcDest, sizeof(RECT));
		ZeroMemory(&m_rcSource, sizeof(RECT));
		ZeroMemory(&m_rcCorner, sizeof(RECT));
		m_bFade = 0xFF;
		m_dwMask = 0;
		m_bHole = false;
		m_bTiledX = false;
		m_bTiledY = false;
	}

	void CImageAttribute::ParseAttribute(LPCTSTR pStrImage)
	{
		if (pStrImage == NULL)
			return;

		// 1、aaa.jpg
		// 2、file='aaa.jpg' res='' restype='0' dest='0,0,0,0' source='0,0,0,0' corner='0,0,0,0' 
		// mask='#FF0000' fade='255' hole='false' xtiled='false' ytiled='false'
		CDuiString sItem;
		CDuiString sValue;
		LPTSTR pstr = NULL;

		while (*pStrImage != _T('\0'))
		{
			sItem.Empty();
			sValue.Empty();
			while (*pStrImage > _T('\0') && *pStrImage <= _T(' ')) pStrImage = ::CharNext(pStrImage);
			while (*pStrImage != _T('\0') && *pStrImage != _T('=') && *pStrImage > _T(' '))
			{
				LPTSTR pstrTemp = ::CharNext(pStrImage);
				while (pStrImage < pstrTemp)
				{
					sItem += *pStrImage++;
				}
			}
			while (*pStrImage > _T('\0') && *pStrImage <= _T(' ')) pStrImage = ::CharNext(pStrImage);
			if (*pStrImage++ != _T('=')) break;
			while (*pStrImage > _T('\0') && *pStrImage <= _T(' ')) pStrImage = ::CharNext(pStrImage);
			if (*pStrImage++ != _T('\'')) break;
			while (*pStrImage != _T('\0') && *pStrImage != _T('\''))
			{
				LPTSTR pstrTemp = ::CharNext(pStrImage);
				while (pStrImage < pstrTemp)
				{
					sValue += *pStrImage++;
				}
			}
			if (*pStrImage++ != _T('\'')) break;
			if (!sValue.IsEmpty())
			{
				if (sItem == _T("file") || sItem == _T("res"))
				{
					m_sImage = sValue;
				}
				else if (sItem == _T("restype"))
				{					
					m_sResType = sValue;
				}
				else if (sItem == _T("dest"))
				{
					m_rcDest.left = _tcstol(sValue.GetData(), &pstr, 10);  ASSERT(pstr);
					m_rcDest.top = _tcstol(pstr + 1, &pstr, 10);    ASSERT(pstr);
					m_rcDest.right = _tcstol(pstr + 1, &pstr, 10);  ASSERT(pstr);
					m_rcDest.bottom = _tcstol(pstr + 1, &pstr, 10); ASSERT(pstr);
				}
				else if (sItem == _T("source"))
				{
					m_rcSource.left = _tcstol(sValue.GetData(), &pstr, 10);  ASSERT(pstr);
					m_rcSource.top = _tcstol(pstr + 1, &pstr, 10);    ASSERT(pstr);
					m_rcSource.right = _tcstol(pstr + 1, &pstr, 10);  ASSERT(pstr);
					m_rcSource.bottom = _tcstol(pstr + 1, &pstr, 10); ASSERT(pstr);
				}
				else if (sItem == _T("corner"))
				{
					m_rcCorner.left = _tcstol(sValue.GetData(), &pstr, 10);  ASSERT(pstr);
					m_rcCorner.top = _tcstol(pstr + 1, &pstr, 10);    ASSERT(pstr);
					m_rcCorner.right = _tcstol(pstr + 1, &pstr, 10);  ASSERT(pstr);
					m_rcCorner.bottom = _tcstol(pstr + 1, &pstr, 10); ASSERT(pstr);
				}
				else if (sItem == _T("mask"))
				{
					if (sValue[0] == _T('#')) m_dwMask = _tcstoul(sValue.GetData() + 1, &pstr, 16);
					else m_dwMask = _tcstoul(sValue.GetData(), &pstr, 16);
				}
				else if (sItem == _T("fade"))
				{
					m_bFade = (BYTE)_tcstoul(sValue.GetData(), &pstr, 10);
				}
				else if (sItem == _T("hole"))
				{
					m_bHole = (_tcscmp(sValue.GetData(), _T("true")) == 0);
				}
				else if (sItem == _T("xtiled"))
				{
					m_bTiledX = (_tcscmp(sValue.GetData(), _T("true")) == 0);
				}
				else if (sItem == _T("ytiled"))
				{
					m_bTiledY = (_tcscmp(sValue.GetData(), _T("true")) == 0);
				}
			}
			if (*pStrImage++ != _T(' ')) break;
		}
	}

	CImageAttribute::operator LPCTSTR() const
	{
		return m_sImageAttribute;
	}

	bool CImageAttribute::operator==(LPCTSTR pStrImage) const
	{
		return m_sImageAttribute == pStrImage;
	}

	const CDuiString& CImageAttribute::operator=(const CDuiString& src)
	{
		SetAttributeString(src);
		return m_sImageAttribute;
	}

	const CDuiString& CImageAttribute::operator=(LPCTSTR lpStr)
	{
		SetAttributeString(lpStr);
		return m_sImageAttribute;
	}

	const CDuiString& CImageAttribute::operator=(const TCHAR ch)
	{
		m_sImageAttribute = ch;
		SetAttributeString(m_sImageAttribute);
		return m_sImageAttribute;
	}

       對CControlUI控件的修改如下：

bool CControlUI::DrawImage(HDC hDC, CImageAttribute& image, const RECT& rcDest, LPCTSTR pStrModify /*= NULL*/)
{
	if (!image.LoadImage(m_pManager))
		return false;

	if (pStrModify != NULL)
	{
		CImageAttribute modifyImage = image;
		modifyImage.ModifyAttribute(pStrModify);
		return CRenderEngine::DrawImage(hDC, m_pManager, rcDest, m_rcPaint, modifyImage);
	}
	return CRenderEngine::DrawImage(hDC, m_pManager, rcDest, m_rcPaint, image);
}

       爲CRenderEngine類新增DrawImage函數代替DrawImageString函數：

bool CRenderEngine::DrawImage(HDC hDC, CPaintManagerUI* pManager, const RECT& rcControl, const RECT& rcPaint, CImageAttribute& image)
{
	if ((pManager == NULL) || (hDC == NULL))
		return false;

	if (image.m_sImage.IsEmpty())
		return false;

	TImageInfo* data = image.m_imageInfo;
	if (!data) return false;

	RECT rcDest = image.m_rcDest;
	rcDest.left += rcControl.left;
	rcDest.top += rcControl.top;
	rcDest.right = rcDest.left + rcControl.right;
	if (rcDest.right > rcControl.right)
		rcDest.right = rcControl.right;
	rcDest.bottom = rcDest.top + rcControl.bottom;
	if (rcDest.bottom > rcControl.bottom)
		rcDest.bottom = rcControl.bottom;

	RECT rcTemp;
	if (!::IntersectRect(&rcTemp, &rcDest, &rcControl)) return true;
	if (!::IntersectRect(&rcTemp, &rcDest, &rcPaint)) return true;

	CRenderEngine::DrawImage(hDC, data->hBitmap, rcDest, rcPaint, image.m_rcSource, image.m_rcCorner,
		pManager->IsBackgroundTransparent() ? true : data->alphaChannel,
		image.m_bFade, image.m_bHole, image.m_bTiledX, image.m_bTiledY);

	return true;
}

總結：

        這次修改的內容比較多，因爲每個控件原本都有圖片字符串，所以我把很多控件的繪製代碼對應的修改了，這些就不貼了。所有控件的修改我都提交到我個人的Duilib庫中：點擊打開鏈接

Redrain QQ:491646717 2016.4.26