Cocos2d-x在win平台下字体边缘有锯齿的解决

原创
2013/06/30 16:58
阅读数 1.5K

6/27号新进展:大范围的重新改写,安全和性能上有更高的提高,但因涉及修改的文档比较多,有兴趣要的可以联系我本人索要。

近几天在玩弄ccx的时候发现在win下的字体显示有严重的锯齿问题,拜读了下win平台下的字体解决方案,结果让我有些失望。ccx是采用win32 api将font画到DC上然后GetDIBits取出位图数据经过处理放到位图数组中,锯齿问题是因为它简化了边缘alpha的处理。注释原文是:

//change pixel's alpha value to 255, when it's RGB != 0

很明显这样处理是错误的,应该根据当前像素的灰度来决定alpha值的大小。另外一个让我比较失望的地方是在读取ttf文件时必须将文件名改为ttf文件的fontname,因为它默认是取文件名为fontname,如果文件名和ttf文件的字体名称不一致的话是无法使用ttf的字模的。这里我稍微修改了一下,目前能够解析ttf的文件头读取文件名。本身我是打算用freetype库来代替ccx在win下的字体解决方案(之前我自己开发的FScript就是采用freetype取代dx自身的id3dxfont),但是目前还不需要改得那么复杂,以后有需要的时候再加上吧。

解决前:

解决后:


修改文件的路径:cocos2dx\platform\win32\CCImage.cpp(完全覆盖)

/****************************************************************************
Copyright (c) 2010 cocos2d-x.org

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/
#define __CC_PLATFORM_IMAGE_CPP__
#include "platform/CCImageCommon_cpp.h"
#include <map>

#define TP_FAMILY_NAME 1
#define TP_FULL_FONT_NAME 4

NS_CC_BEGIN
	
std::map<const char*, const char*> map_font;

struct TableDirectory {
	char name[5]; //table name
	int checkSum; //Check sum
	int offset; //Offset from beginning of file
	int length; //length of the table in bytes
};

struct NameTableHeader {
	short fSelector; //format selector. Always 0
	short nRCount; //Name Records count
	short storageOffset; //Offset for strings storage,
};

struct NameRecord {
	short platformID;
	short encodingID;
	short languageID;
	short nameID;
	short stringLength;
	short stringOffset; //from start of storage area
};

inline char* strlwr(char* str)
{
	char* orig = str;
	for (; *str != '\0'; str++ )
		*str = tolower(*str);
	return orig;
}

void freadShort(short &i, FILE *f) {
	fread(&i, sizeof(short), 1, f);

	short b,c;
	b = (i>>8) & 0x00FF;
	c = (i<<8) & (~0x00FF);
	i = b|c;
}

void freadInt(int &i, FILE *f) {
	fread(&i, sizeof(int), 1, f);

	unsigned char b[4];
	b[0] = (byte)(i);
	b[1] = (byte)(i >> 8);
	b[2] = (byte)(i >> 16);
	b[3] = (byte)(i >> 24);
	i = (b[3] | b[2] << 8 | b[1] << 16 | b[0] << 24);
}

bool parse(const char* file_path) {
	FILE *f = fopen(file_path, "rb");
	if(f==NULL) {
		return false;
	}

	short majorVersion, minorVersion, numOfTables;
	freadShort(majorVersion, f);
	freadShort(minorVersion, f);
	freadShort(numOfTables, f);

	if (majorVersion != 1 || minorVersion != 0) {
		return false;
	}

	fseek(f, 12, SEEK_SET);

	bool found = false;

	TableDirectory tableDirectory;
	memset(tableDirectory.name, 0, 5);
	for (int i = 0; i < numOfTables; i++) {
		fread(tableDirectory.name, 4, 1, f);

		freadInt(tableDirectory.checkSum, f);
		freadInt(tableDirectory.offset, f);
		freadInt(tableDirectory.length, f);

		if(!strcmp(strlwr(tableDirectory.name), "name")) {
			found = true;
			break;
		} else if (tableDirectory.name == NULL || strlen(tableDirectory.name) == 0) {
			break;
		}
	}

	// not found table of name
	if (!found) {
		return false;
	}

	fseek(f, tableDirectory.offset, SEEK_SET);
	NameTableHeader nameTableHeader;
	freadShort(nameTableHeader.fSelector, f);
	freadShort(nameTableHeader.nRCount, f);
	freadShort(nameTableHeader.storageOffset, f);

	char *font_name = new char[32];
	char *family_name = new char[32];
	memset(font_name, 0, 32);
	memset(family_name, 0, 32);

	NameRecord nameRecord;
	char flag = 0;
	for (int i = 0; i < nameTableHeader.nRCount; i++) {
		freadShort(nameRecord.platformID, f);
		freadShort(nameRecord.encodingID, f);
		freadShort(nameRecord.languageID, f);
		freadShort(nameRecord.nameID, f);
		freadShort(nameRecord.stringLength, f);
		freadShort(nameRecord.stringOffset, f);

		long pos = ftell(f);
		char *buf = new char[nameRecord.stringLength+1];
		memset(buf,0,nameRecord.stringLength+1);

		long vpos = tableDirectory.offset + nameRecord.stringOffset + nameTableHeader.storageOffset;
		fseek(f, vpos, SEEK_SET);
		fread(buf, nameRecord.stringLength, 1, f);

		if(nameRecord.nameID == TP_FULL_FONT_NAME) {
			if(!strlen(font_name)) {
				strcpy(font_name, buf);
				flag |= 2;
				break;
			}
		} else if(nameRecord.nameID == TP_FAMILY_NAME) {
			if(!strlen(family_name)) {
				strcpy(family_name, buf);
				flag |= 1;
			}
		}

		fseek(f, pos, SEEK_SET);
	}

	if(flag & 2) {
		map_font[file_path] = font_name;
	} else if(flag & 1) {
		map_font[file_path] = family_name;
	} else {
		return false;
	}

	return true;
}

const char* getFontName(const char* file_name) {
	if(!map_font.count(file_name)) {
		if(!parse(file_name))
			return NULL;
	}

	return map_font[file_name];
}

/**
@brief    A memory DC which uses to draw text on bitmap.
*/
class BitmapDC
{
public:
	BitmapDC(HWND hWnd = NULL)
	: m_hDC(NULL)
	, m_hBmp(NULL)
	, m_hFont((HFONT)GetStockObject(DEFAULT_GUI_FONT))
	, m_hWnd(NULL)
	{
		m_hWnd = hWnd;
		HDC hdc = GetDC(hWnd);
		m_hDC   = CreateCompatibleDC(hdc);
		ReleaseDC(hWnd, hdc);
	}

	~BitmapDC()
	{
		prepareBitmap(0, 0);
		if (m_hDC)
		{
			DeleteDC(m_hDC);
		}
		HFONT hDefFont = (HFONT)GetStockObject(DEFAULT_GUI_FONT);
		if (hDefFont != m_hFont)
		{
			DeleteObject(m_hFont);
			m_hFont = hDefFont;
		}
		// release temp font resource	
		if (m_curFontPath.size() > 0)
		{
			wchar_t * pwszBuffer = utf8ToUtf16(m_curFontPath);
			if (pwszBuffer)
			{
				RemoveFontResource(pwszBuffer);
				SendMessage( m_hWnd, WM_FONTCHANGE, 0, 0);
				delete [] pwszBuffer;
				pwszBuffer = NULL;
			}
		}
	}

	wchar_t * utf8ToUtf16(std::string nString)
	{
		wchar_t * pwszBuffer = NULL;
		do 
		{
			if (nString.size() < 0)
			{
				break;
			}
			// utf-8 to utf-16
			int nLen = nString.size();
			int nBufLen  = nLen + 1;			
			pwszBuffer = new wchar_t[nBufLen];
			CC_BREAK_IF(! pwszBuffer);
			memset(pwszBuffer,0,nBufLen);
			nLen = MultiByteToWideChar(CP_UTF8, 0, nString.c_str(), nLen, pwszBuffer, nBufLen);		
			pwszBuffer[nLen] = '\0';
		} while (0);	
		return pwszBuffer;

	}

	bool setFont(const char * pFontName = NULL, int nSize = 0)
	{
		bool bRet = false;
		do 
		{
			std::string fontName = pFontName;
			std::string fontPath;
			HFONT       hDefFont = (HFONT)GetStockObject(DEFAULT_GUI_FONT);
			LOGFONTA    tNewFont = {0};
			LOGFONTA    tOldFont = {0};
			GetObjectA(hDefFont, sizeof(tNewFont), &tNewFont);
			if (fontName.c_str())
			{ 
				// create font from ttf file
				int nFindttf = fontName.find(".ttf");
				int nFindTTF = fontName.find(".TTF");
				if (nFindttf >= 0 || nFindTTF >= 0)
				{
					
					fontPath = CCFileUtils::sharedFileUtils()->fullPathForFilename(fontName.c_str());
					/*
					int nFindPos = fontName.rfind("/");
					fontName = &fontName[nFindPos+1];
					nFindPos = fontName.rfind(".");
					fontName = fontName.substr(0,nFindPos);*/

					fontName = getFontName(fontPath.c_str());
				}
				tNewFont.lfCharSet = DEFAULT_CHARSET;

				strcpy_s(tNewFont.lfFaceName, LF_FACESIZE, fontName.c_str());
			}
			if (nSize)
			{
				tNewFont.lfHeight = -nSize;
			}
			GetObjectA(m_hFont,  sizeof(tOldFont), &tOldFont);

			if (tOldFont.lfHeight == tNewFont.lfHeight
				&& 0 == strcmp(tOldFont.lfFaceName, tNewFont.lfFaceName))
			{
				// already has the font 
				bRet = true;
				break;
			}

			// delete old font
			if (m_hFont != hDefFont)
			{
				DeleteObject(m_hFont);
				// release old font register
				if (m_curFontPath.size() > 0)
				{
					wchar_t * pwszBuffer = utf8ToUtf16(m_curFontPath);
					if (pwszBuffer)
					{
						if(RemoveFontResource(pwszBuffer))
						{
							SendMessage( m_hWnd, WM_FONTCHANGE, 0, 0);
						}						
						delete [] pwszBuffer;
						pwszBuffer = NULL;
					}
				}
				if (fontPath.size() > 0)
					m_curFontPath = fontPath;
				else
					m_curFontPath.clear();
				// register temp font
				if (m_curFontPath.size() > 0)
				{
					wchar_t * pwszBuffer = utf8ToUtf16(m_curFontPath);
					if (pwszBuffer)
					{
						if(AddFontResource(pwszBuffer))
						{
							SendMessage( m_hWnd, WM_FONTCHANGE, 0, 0);
						}						
						delete [] pwszBuffer;
						pwszBuffer = NULL;
					}
				}
			}
			m_hFont = NULL;

			// disable Cleartype
			tNewFont.lfQuality = ANTIALIASED_QUALITY;

			// create new font
			m_hFont = CreateFontIndirectA(&tNewFont);
			if (! m_hFont)
			{
				// create failed, use default font
				m_hFont = hDefFont;
				break;
			}
			
			bRet = true;
		} while (0);
		return bRet;
	}

	SIZE sizeWithText(const wchar_t * pszText, int nLen, DWORD dwFmt, LONG nWidthLimit)
	{
		SIZE tRet = {0};
		do 
		{
			CC_BREAK_IF(! pszText || nLen <= 0);

			RECT rc = {0, 0, 0, 0};
			DWORD dwCalcFmt = DT_CALCRECT;

			if (nWidthLimit > 0)
			{
				rc.right = nWidthLimit;
				dwCalcFmt |= DT_WORDBREAK
					| (dwFmt & DT_CENTER)
					| (dwFmt & DT_RIGHT);
			}
			// use current font to measure text extent
			HGDIOBJ hOld = SelectObject(m_hDC, m_hFont);

			// measure text size
			DrawTextW(m_hDC, pszText, nLen, &rc, dwCalcFmt);
			SelectObject(m_hDC, hOld);

			tRet.cx = rc.right;
			tRet.cy = rc.bottom;
		} while (0);

		return tRet;
	}

	bool prepareBitmap(int nWidth, int nHeight)
	{
		// release bitmap
		if (m_hBmp)
		{
			DeleteObject(m_hBmp);
			m_hBmp = NULL;
		}
		if (nWidth > 0 && nHeight > 0)
		{
			m_hBmp = CreateBitmap(nWidth, nHeight, 1, 32, NULL);
			if (! m_hBmp)
			{
				return false;
			}
		}
		return true;
	}

	int drawText(const char * pszText, SIZE& tSize, CCImage::ETextAlign eAlign)
	{
		int nRet = 0;
		wchar_t * pwszBuffer = 0;
		do 
		{
			CC_BREAK_IF(! pszText);

			DWORD dwFmt = DT_WORDBREAK;
			DWORD dwHoriFlag = eAlign & 0x0f;
			DWORD dwVertFlag = (eAlign & 0xf0) >> 4;

			switch (dwHoriFlag)
			{
			case 1: // left
				dwFmt |= DT_LEFT;
				break;
			case 2: // right
				dwFmt |= DT_RIGHT;
				break;
			case 3: // center
				dwFmt |= DT_CENTER;
				break;
			}

			int nLen = strlen(pszText);
			// utf-8 to utf-16
			int nBufLen  = nLen + 1;
			pwszBuffer = new wchar_t[nBufLen];
			CC_BREAK_IF(! pwszBuffer);

			memset(pwszBuffer, 0, sizeof(wchar_t)*nBufLen);
			nLen = MultiByteToWideChar(CP_UTF8, 0, pszText, nLen, pwszBuffer, nBufLen);

			SIZE newSize = sizeWithText(pwszBuffer, nLen, dwFmt, tSize.cx);

			RECT rcText = {0};
			// if content width is 0, use text size as content size
			if (tSize.cx <= 0)
			{
				tSize = newSize;
				rcText.right  = newSize.cx;
				rcText.bottom = newSize.cy;
			}
			else
			{

				LONG offsetX = 0;
				LONG offsetY = 0;
				rcText.right = newSize.cx; // store the text width to rectangle

				// calculate text horizontal offset
				if (1 != dwHoriFlag          // and text isn't align to left
					&& newSize.cx < tSize.cx)   // and text's width less then content width,
				{                               // then need adjust offset of X.
					offsetX = (2 == dwHoriFlag) ? tSize.cx - newSize.cx     // align to right
						: (tSize.cx - newSize.cx) / 2;                      // align to center
				}

				// if content height is 0, use text height as content height
				// else if content height less than text height, use content height to draw text
				if (tSize.cy <= 0)
				{
					tSize.cy = newSize.cy;
					dwFmt   |= DT_NOCLIP;
					rcText.bottom = newSize.cy; // store the text height to rectangle
				}
				else if (tSize.cy < newSize.cy)
				{
					// content height larger than text height need, clip text to rect
					rcText.bottom = tSize.cy;
				}
				else
				{
					rcText.bottom = newSize.cy; // store the text height to rectangle

					// content larger than text, need adjust vertical position
					dwFmt |= DT_NOCLIP;

					// calculate text vertical offset
					offsetY = (2 == dwVertFlag) ? tSize.cy - newSize.cy     // align to bottom
						: (3 == dwVertFlag) ? (tSize.cy - newSize.cy) / 2   // align to middle
						: 0;                                                // align to top
				}

				if (offsetX || offsetY)
				{
					OffsetRect(&rcText, offsetX, offsetY);
				}
			}

			CC_BREAK_IF(! prepareBitmap(tSize.cx, tSize.cy));

			// draw text
			HGDIOBJ hOldFont = SelectObject(m_hDC, m_hFont);
			HGDIOBJ hOldBmp  = SelectObject(m_hDC, m_hBmp);
			
			SetBkMode(m_hDC, TRANSPARENT);
			SetTextColor(m_hDC, RGB(255, 255, 255)); // white color

			// draw text
			nRet = DrawTextW(m_hDC, pwszBuffer, nLen, &rcText, dwFmt);
			//DrawTextA(m_hDC, pszText, nLen, &rcText, dwFmt);

			SelectObject(m_hDC, hOldBmp);
			SelectObject(m_hDC, hOldFont);
		} while (0);
		CC_SAFE_DELETE_ARRAY(pwszBuffer);
		return nRet;
	}

	CC_SYNTHESIZE_READONLY(HDC, m_hDC, DC);
	CC_SYNTHESIZE_READONLY(HBITMAP, m_hBmp, Bitmap);
private:
	friend class CCImage;
	HFONT   m_hFont;
	HWND    m_hWnd;
	std::string m_curFontPath;
};

static BitmapDC& sharedBitmapDC()
{
	static BitmapDC s_BmpDC;
	return s_BmpDC;
}

bool CCImage::initWithString(
							   const char *    pText, 
							   int             nWidth/* = 0*/, 
							   int             nHeight/* = 0*/,
							   ETextAlign      eAlignMask/* = kAlignCenter*/,
							   const char *    pFontName/* = nil*/,
							   int             nSize/* = 0*/)
{
	bool bRet = false;
	do 
	{
		CC_BREAK_IF(! pText);       

		BitmapDC& dc = sharedBitmapDC();

		if (! dc.setFont(pFontName, nSize))
		{
			CCLog("Can't found font(%s), use system default", pFontName);
		}

		// draw text
		SIZE size = {nWidth, nHeight};
		CC_BREAK_IF(! dc.drawText(pText, size, eAlignMask));

		m_pData = new unsigned char[size.cx * size.cy * 4];
		CC_BREAK_IF(! m_pData);

		struct
		{
			BITMAPINFOHEADER bmiHeader;
			int mask[4];
		} bi = {0};
		bi.bmiHeader.biSize = sizeof(bi.bmiHeader);
		CC_BREAK_IF(! GetDIBits(dc.getDC(), dc.getBitmap(), 0, 0, 
			NULL, (LPBITMAPINFO)&bi, DIB_RGB_COLORS));

		m_nWidth    = (short)size.cx;
		m_nHeight   = (short)size.cy;
		m_bHasAlpha = true;
		m_bPreMulti = false;
		m_nBitsPerComponent = 8;
		// copy pixed data
		bi.bmiHeader.biHeight = (bi.bmiHeader.biHeight > 0)
		   ? - bi.bmiHeader.biHeight : bi.bmiHeader.biHeight;
		GetDIBits(dc.getDC(), dc.getBitmap(), 0, m_nHeight, m_pData, 
			(LPBITMAPINFO)&bi, DIB_RGB_COLORS);

		// change pixel's alpha value to 255, when it's RGB != 0
		
		COLORREF * pPixel = NULL;
		for (int y = 0; y < m_nHeight; ++y)
		{
			pPixel = (COLORREF *)m_pData + y * m_nWidth;
			for (int x = 0; x < m_nWidth; ++x)
			{
				COLORREF& clr = *pPixel;
				if (GetRValue(clr) || GetGValue(clr) || GetBValue(clr))
				{
					long mask = GetRValue(clr) << 24;
					//clr |= 0xff000000;
					clr |= mask;
				}
				++pPixel;
			}
		}

		bRet = true;
	} while (0);

	return bRet;
}

NS_CC_END

展开阅读全文
加载中
点击加入讨论🔥(5) 发布并加入讨论🔥
打赏
5 评论
8 收藏
0
分享
返回顶部
顶部