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cocos2dx windows phone平台下CCLabelTTF自动换行的实现
先吐个槽，刚准备发这条博客的时候居然发现账号被盗了，真是有人闲得蛋疼，顺便赞一个csdn的客服，处理的很快。
好了，言归正转。看了一下，自动换行的实现在CCFreeType这个类里，这个类的实现只是针对英文的，它采用空格断句的方式来进行操作，一个word一个word的加，如果发现超过规定的范围就会换行，但是对于中文来说，这个实现简直弱爆了，所以就会出现不能自动换行的情况。参考它的实现，做一点小的修改，基本原理如下
1、读一行文本出来，参考它的实现，算出这个文本的宽度
2、如果这个宽度没有超过，则直接显示
3、如果这个宽度走过了，则按等宽字体处理，根据宽度算出来总共应该是几行，然后按长度进行分隔换行。
注意这个实现有几个问题：
1、性能问题，其实是在计算出了所有的字之后才发现超过了，这个本来可以发现的更早，但是为了尽可能利用原有的代码结构，只用先这样了。
2、是以等宽字体的实现的，这个不一定正确，所以可能会出现某一些还是超过了的情况。
最后附上修改的diff，我使用的是2.2.4版本。
diff --git a/cocos2d-x-2.2.4/cocos2dx/platform/winrt/CCFreeTypeFont.cpp b/cocos2d-x-2.2.4/cocos2dx/platform/winrt/CCFreeTypeFont.cpp
index 9886d0a..46489af 100644
--- a/cocos2d-x-2.2.4/cocos2dx/platform/winrt/CCFreeTypeFont.cpp
+++ b/cocos2d-x-2.2.4/cocos2dx/platform/winrt/CCFreeTypeFont.cpp
@@ -368,13 +368,67 @@ FT_Error CCFreeTypeFont::addWord(const std::string& word)
return error;
}
+FT_Error CCFreeTypeFont::addLine(wchar_t* line, int size, bool wrap)
+{
+ std::vector<TGlyph> glyphs; // glyphs for the word
+ FT_BBox bbox; // bounding box containing all of the glyphs in the word
+ int maxWidth = m_inWidth ? m_inWidth : m_windowWidth;
+
+ FT_Vector pen = m_currentLine->pen;
+ FT_Error error = initWordGlyphs(glyphs, line, size, pen);
+ if (!error)
+ {
+ compute_bbox(glyphs, &bbox);
+ if (!wrap || bbox.xMax <= maxWidth)
+ {
+ m_currentLine->pen = pen;
+ m_currentLine->glyphs.insert(m_currentLine->glyphs.end(), glyphs.begin(), glyphs.end());
+ if (m_currentLine->width == 0)
+ {
+ m_currentLine->bbox = bbox;
+ }
+ else
+ {
+ m_currentLine->bbox.xMax = bbox.xMax;
+ }
+ m_currentLine->width = m_currentLine->bbox.xMax - m_currentLine->bbox.xMin;
+ }
+ else
+ {
+ int width = bbox.xMax;
+ int lines = width / maxWidth + 1;
+ float fline = float(width) / float(maxWidth);
+ int lineWidth = int(size / fline);
+ int offset = 0;
+ for (int i = 0; i < lines; i++)
+ {
+ if (i)
+ {
+ newLine();
+ }
+ wchar_t* buffer = line + offset;
+ int buffer_len = size - offset;
+ if (buffer_len > lineWidth)
+ {
+ buffer_len = lineWidth;
+ }
+ offset += buffer_len;
+ addLine(buffer, buffer_len, false);
+ if (i < lines - 1)
+ {
+ endLine();
+ }
+ }
+ }
+ }
+ return error;
+}
+
FT_Error CCFreeTypeFont::initGlyphs(const char* text)
{
FT_Error error = 0;
std::stringstream stringStream(text);
std::string line;
- vector<std::string> lines;
- vector<std::string> words;
m_textWidth = 0;
m_textHeight = 0;
@@ -387,19 +441,21 @@ FT_Error CCFreeTypeFont::initGlyphs(const char* text)
{
newLine();
- std::size_t prev = 0, pos;
- while ((pos = line.find_first_of(" ", prev)) != std::string::npos)
- {
- if (pos > prev)
- {
- addWord(line.substr(prev, pos-prev));
- }
- prev = pos + 1;
- }
- if (prev < line.length())
- {
- addWord(line.substr(prev, std::string::npos));
- }
+ wchar_t * pwszBuffer = nullptr;
+
+ int num_chars = line.size();
+ int nBufLen = num_chars + 1;
+ pwszBuffer = new wchar_t[nBufLen];
+ if (!pwszBuffer)
+ {
+ return -1;
+ }
+
+ memset(pwszBuffer, 0, nBufLen);
+ num_chars = MultiByteToWideChar(CP_UTF8, 0, line.c_str(), num_chars, pwszBuffer, nBufLen);
+ pwszBuffer[num_chars] = '\0';
+ error = addLine(pwszBuffer, num_chars, true);
+ CC_SAFE_DELETE_ARRAY(pwszBuffer);
endLine();
}
@@ -513,6 +569,64 @@ FT_Error CCFreeTypeFont::initWordGlyphs(std::vector<TGlyph>& glyphs, const std::
return error;
}
+FT_Error CCFreeTypeFont::initWordGlyphs(std::vector<TGlyph>& glyphs, wchar_t* word, int size, FT_Vector& pen)
+{
+ FT_GlyphSlot slot = m_face->glyph;
+ FT_UInt glyph_index;
+ FT_UInt previous = 0;
+ FT_Error error = 0;
+ PGlyph glyph;
+ unsigned int numGlyphs = 0;
+
+ glyphs.clear();
+ glyphs.resize(size);
+ FT_Bool useKerning = FT_HAS_KERNING(m_face);
+
+ for (int n = 0; n < size; n++)
+ {
+ glyph = &glyphs[numGlyphs];
+
+ /* convert character code to glyph index */
+ FT_ULong c = word[n];
+ glyph_index = FT_Get_Char_Index(m_face, c);
+
+ if (useKerning && previous && glyph_index)
+ {
+ FT_Vector delta;
+ FT_Get_Kerning(m_face, previous, glyph_index,
+ FT_KERNING_DEFAULT, &delta);
+ pen.x += delta.x >> 6;
+ }
+
+ /* store current pen position */
+ glyph->pos = pen;
+ glyph->index = glyph_index;
+
+ /* load glyph image into the slot without rendering */
+ error = FT_Load_Glyph(m_face, glyph_index, FT_LOAD_DEFAULT);
+ if (error)
+ continue; /* ignore errors, jump to next glyph */
+
+ /* extract glyph image and store it in our table */
+ error = FT_Get_Glyph(m_face->glyph, &glyph->image);
+ if (error)
+ continue; /* ignore errors, jump to next glyph */
+
+ /* translate the glyph image now */
+ FT_Glyph_Transform(glyph->image, 0, &glyph->pos);
+
+ /* increment pen position */
+ pen.x += slot->advance.x >> 6;
+
+ /* record current glyph index */
+ previous = glyph_index;
+
+ numGlyphs++;
+ }
+
+ return error;
+}
+
void CCFreeTypeFont::compute_bbox(std::vector<TGlyph>& glyphs, FT_BBox *abbox)
{
FT_BBox bbox;
diff --git a/cocos2d-x-2.2.4/cocos2dx/platform/winrt/CCFreeTypeFont.h b/cocos2d-x-2.2.4/cocos2dx/platform/winrt/CCFreeTypeFont.h
index 4c1cc3e..a325071 100644
--- a/cocos2d-x-2.2.4/cocos2dx/platform/winrt/CCFreeTypeFont.h
+++ b/cocos2d-x-2.2.4/cocos2dx/platform/winrt/CCFreeTypeFont.h
@@ -100,6 +100,7 @@ private:
FT_Error CCFreeTypeFont::initGlyphs(const char* text);
FT_Error CCFreeTypeFont::initWordGlyphs(std::vector<TGlyph>& glyphs, const std::string& text, FT_Vector& pen);
+ FT_Error CCFreeTypeFont::initWordGlyphs(std::vector<TGlyph>& glyphs, wchar_t* word, int size, FT_Vector& pen);
void compute_bbox(std::vector<TGlyph>& glyphs, FT_BBox *abbox);
@@ -114,6 +115,7 @@ private:
FT_Vector getPenForAlignment(FTLineInfo* pInfo, CCImage::ETextAlign eAlignMask, int lineNumber, int totalLines);
FT_Error addWord(const std::string& word);
+ FT_Error addLine(wchar_t* line, int size, bool wrap);
void newLine();
void endLine();
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