原文链接： http://www.cnblogs.com/zouzf/p/3985330.html
在wp8平台上，CCLabeTTF显示中文不会自动换行，看了下源码，原来底层的实现是根据text的空格进行判断的，每遇到一个空格就判断是否超过label的宽度，超过就换行，但text如果是中文的话，哪来的空格给换行~~
以下实现全部参考 http://blog.csdn.net/hopingwhite/article/details/38414917 ，整理后的代码如下：
在CCFreeTypeFont.h里的CCFreeTypeFont类添加两个方法：
FT_Error addLine(const std::string& line);
void endLine_chinese();
实现如下：
1 void CCFreeTypeFont::endLine_chinese() 2 { 3 if(m_currentLine) 4 { 5 m_lines.push_back(m_currentLine); 6 compute_bbox(m_currentLine->glyphs, &m_currentLine->bbox); 7 m_currentLine->width = m_currentLine->bbox.xMax - m_currentLine->bbox.xMin; 8 m_textWidth = max(m_textWidth,m_currentLine->bbox.xMax - m_currentLine->bbox.xMin); 9 m_textHeight += m_lineHeight; 10 m_currentLine = NULL; 11 } 12 } 13 14 15 16 FT_Error CCFreeTypeFont::addLine(const std::string& line) 17 { 18 wchar_t * pwszBuffer = nullptr; 19 20 int num_chars = line.size(); 21 int nBufLen = num_chars + 1; 22 pwszBuffer = new wchar_t[nBufLen]; 23 if (!pwszBuffer) 24 { 25 return -1; 26 } 27 28 memset(pwszBuffer, 0, nBufLen); 29 num_chars = MultiByteToWideChar(CP_UTF8, 0, line.c_str(), num_chars, pwszBuffer, nBufLen); 30 pwszBuffer[num_chars] = ' '; 31 32 int maxWidth = m_inWidth ? m_inWidth : m_windowWidth; 33 34 newLine(); 35 FT_Vector pen = m_currentLine->pen; 36 FT_GlyphSlot slot = m_face->glyph; 37 FT_UInt glyph_index; 38 FT_UInt previous = 0; 39 FT_Error error = 0; 40 unsigned int numGlyphs = 0; 41 42 FT_Bool useKerning = FT_HAS_KERNING(m_face); 43 44 int n = 0; 45 while (n < num_chars) 46 { 47 TGlyph glyph; 48 49 /* convert character code to glyph index */ 50 FT_ULong c = pwszBuffer[n++]; 51 glyph_index = FT_Get_Char_Index(m_face, c); 52 53 if (useKerning && previous && glyph_index) 54 { 55 FT_Vector delta; 56 FT_Get_Kerning(m_face, previous, glyph_index, 57 FT_KERNING_DEFAULT, &delta); 58 pen.x += delta.x >> 6; 59 } 60 61 /* store current pen position */ 62 glyph.pos = pen; 63 glyph.index = glyph_index; 64 65 /* load glyph image into the slot without rendering */ 66 error = FT_Load_Glyph(m_face, glyph_index, FT_LOAD_DEFAULT); 67 if (error) 68 continue; /* ignore errors, jump to next glyph */ 69 70 /* extract glyph image and store it in our table */ 71 error = FT_Get_Glyph(m_face->glyph, &glyph.image); 72 if (error) 73 continue; /* ignore errors, jump to next glyph */ 74 75 /* translate the glyph image now */ 76 FT_Glyph_Transform(glyph.image, 0, &glyph.pos); 77 78 /* increment pen position */ 79 pen.x += slot->advance.x >> 6; 80 81 if (pen.x > maxWidth) 82 { 83 m_currentLine->pen = pen; 84 85 // endLine(); 86 endLine_chinese(); 87 88 newLine(); 89 pen = m_currentLine->pen; 90 previous = 0; 91 n--; 92 } 93 else 94 { 95 m_currentLine->glyphs.push_back(glyph); 96 /* record current glyph index */ 97 previous = glyph_index; 98 } 99 } 100 101 if (m_currentLine) 102 { 103 m_currentLine->pen = pen; 104 105 //endLine(); 106 endLine_chinese(); 107 } 108 109 CC_SAFE_DELETE_ARRAY(pwszBuffer); 110 return error; 111 }
FT_Error CCFreeTypeFont::initGlyphs(const char* text)的实现改成如下：
1 FT_Error CCFreeTypeFont::initGlyphs(const char* text) 2 { 3 FT_Error error = 0; 4 std::stringstream stringStream(text); 5 std::string line; 6 vector<std::string> lines; 7 vector<std::string> words; 8 9 m_textWidth = 0; 10 m_textHeight = 0; 11 // the height of a line of text based on the max height of a glyph in the font size 12 m_lineHeight = ((m_face->size->metrics.ascender) >> 6) - ((m_face->size->metrics.descender) >> 6); 13 14 m_lines.clear(); 15 16 while(std::getline(stringStream, line) && !error) 17 { 18 /* newLine(); 19 20 std::size_t prev = 0, pos; 21 while ((pos = line.find_first_of(" ", prev)) != std::string::npos) 22 { 23 if (pos > prev) 24 { 25 addWord(line.substr(prev, pos-prev)); 26 } 27 prev = pos + 1; 28 } 29 if (prev < line.length()) 30 { 31 addWord(line.substr(prev, std::string::npos)); 32 } 33 endLine(); 34 */ 35 addLine(line); 36 } 37 38 return error; 39 }
再次感谢： http://blog.csdn.net/hopingwhite/article/details/38414917