cocos2dx windows phone平台下CCLabelTTF自动换行的实现(2)
时间：2014-08-07 13:13:10
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前几天发过一篇文章说如何实现wp8下的CCLabelTTF如何自动换行，后来发现果如预料的那般，效果很不好，主要是非等宽字体的情况下看着很糟心，因此再修改了一版，效果要好很多了。
具体实现其实就是参考initGlyphs，但是会不断的检查是否超过宽度，如果超过则自动换行。
具体的直接看代码就明白了
/****************************************************************************
Copyright (c) 2010 cocos2d-x.org
Copyright (c) Microsoft Open Technologies, Inc.
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.
****************************************************************************/
#ifndef __PLATFORM_WINRT_FREETYPE_H__
#define __PLATFORM_WINRT_FREETYPE_H__
#include "platform/CCCommon.h"
#include "platform/CCImage.h"
#include <string>
#include <vector>
#include <memory>
#define generic GenericFromFreeTypeLibrary
#define internal InternalFromFreeTypeLibrary
#include <ft2build.h>
#include <freetype/freetype.h>
#include <freetype/ftglyph.h>
#include <freetype/ftoutln.h>
#include <freetype/fttrigon.h>
#undef generic
#undef internal
NS_CC_BEGIN
typedef struct TGlyph_
{
FT_UInt index; // glyph index
FT_Vector pos; // glyph origin on the baseline
FT_Glyph image; // glyph image
} TGlyph, *PGlyph;
typedef struct FontBufferInfo
{
unsigned char* pBuffer;
unsigned long size;
} FontBufferInfo;
typedef struct FTWordInfo
{
std::vector<TGlyph> glyphs; // glyphs for the word
FT_BBox bbox; // bounding box containing all of the glyphs in the word
} FTWordInfo;
typedef struct FTLineInfo
{
std::vector<TGlyph> glyphs; // glyphs for the line text
FT_BBox bbox; // bounding box containing all of the glyphs in the line
unsigned int width; // width of the line
FT_Vector pen; // current pen position
} FTLineInfo;
class CC_DLL CCFreeTypeFont
{
public:
CCFreeTypeFont();
~CCFreeTypeFont();
bool initWithString(
const char* pText,
const char* pFontName,
int nSize,
int width,
int height
);
unsigned char* getBitmap(
CCImage::ETextAlign eAlignMask,
int* outWidth,
int* outHeight
);
private:
unsigned char* loadFont(const char *pFontName, unsigned long *size);
unsigned char* CCFreeTypeFont::loadSystemFont(const char *pFontName, unsigned long *size);
FT_Error CCFreeTypeFont::initGlyphs(const char* text);
void compute_bbox(std::vector<TGlyph>& glyphs, FT_BBox *abbox);
void drawText(FTLineInfo* pInfo, unsigned char* pBuffer, FT_Vector *pen);
void draw_bitmap(unsigned char* pBuffer, FT_Bitmap* bitmap,FT_Int x,FT_Int y);
void reset();
FT_Vector getPenForAlignment(FTLineInfo* pInfo, CCImage::ETextAlign eAlignMask, int lineNumber, int totalLines);
FT_Error addLine(const std::string& line);
void newLine();
void endLine();
const std::string m_space;
std::string m_text;
std::string m_fontName;
FT_Face m_face;
std::vector<FTLineInfo*> m_lines;
int m_inWidth; // requested width of text box
int m_inHeight; // requested height of text box
int m_width; // final bitMap width
int m_height; // final bitMap height
int m_textWidth; // width of text text after word wrapping and line breaks
int m_textHeight; // height of text text after word wrapping and line breaks
int m_lineHeight; // height of a line for the font size
int m_windowWidth; // the width of the window
FTLineInfo* m_currentLine; // the current line object to add words to.
};
NS_CC_END/****************************************************************************
Copyright (c) 2013 cocos2d-x.org http://cocos2d-x.org
Copyright (c) Microsoft Open Technologies, Inc.
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.
****************************************************************************/
#include "CCFreeTypeFont.h"
#include "CCDirector.h"
#include "platform/CCFileUtils.h"
#if (CC_TARGET_PLATFORM != CC_PLATFORM_WP8)
#include <dwrite.h>
#endif
#include <map>
#include <string>
#include <sstream>
#include <vector>
#include <memory>
#include <algorithm>
using namespace std;
NS_CC_BEGIN
static map<std::string, FontBufferInfo> s_fontsNames;
static FT_Library s_FreeTypeLibrary = nullptr;
CCFreeTypeFont::CCFreeTypeFont()
:m_space(" ")
, m_face(nullptr)
{
}
CCFreeTypeFont::~CCFreeTypeFont()
{
reset();
}
void CCFreeTypeFont::reset()
{
for(auto line:m_lines)
{
line->glyphs.clear();
delete line;
}
m_lines.clear();
if(m_face)
{
FT_Done_Face(m_face);
m_face = nullptr;
}
}
bool CCFreeTypeFont::initWithString(
const char* pText,
const char* pFontName,
int nSize,
int inWidth,
int inHeight )
{
FT_Error error = 0;
unsigned long size = 0;
unsigned char* pBuffer = nullptr;
unsigned char* data = nullptr;
CCSize winSize = CCDirector::sharedDirector()->getWinSizeInPixels();
m_windowWidth = (int)winSize.width;
m_inWidth = inWidth;
m_inHeight = inHeight;
#if 0
// check the cache for the font file buffer
auto ittFontNames = s_fontsNames.find(pFontName);
if(ittFontNames != s_fontsNames.end())
{
pBuffer = ittFontNames->second.pBuffer;
size = ittFontNames->second.size;
}
#endif // 0
if(!pBuffer)
{
// attempt to load font from Resources fonts folder
pBuffer = loadFont(pFontName, &size);
if(!pBuffer)
{
// attempt to load font from System fonts folder
pBuffer = loadSystemFont(pFontName, &size);
}
if(!pBuffer)
{
// attempt to load default font from Resources fonts folder
pBuffer = loadFont("Arial", &size);
}
if(!pBuffer)
{
// attempt to load default font from System fonts folder
pBuffer = loadSystemFont("Arial", &size);
}
if(!pBuffer) // font not found!
return false;
#if 0
// cache the font file buffer
FontBufferInfo info;
info.pBuffer = pBuffer;
info.size = size;
s_fontsNames[pFontName]=info;
#endif // 0
}
m_fontName = pFontName;
m_text = pText;
if(!s_FreeTypeLibrary)
{
error = FT_Init_FreeType(&s_FreeTypeLibrary);
}
if(!error && !m_face)
{
error = FT_New_Memory_Face(s_FreeTypeLibrary, pBuffer, size, 0, &m_face);
}
if(!error)
{
error = FT_Select_Charmap(m_face, FT_ENCODING_UNICODE);
}
if(!error)
error = FT_Set_Char_Size(m_face,nSize<<6,nSize<<6,72,72);
if(!error)
error = initGlyphs(pText);
delete [] pBuffer;
return error == 0;
}
unsigned char* CCFreeTypeFont::getBitmap(CCImage::ETextAlign eAlignMask, int* outWidth, int* outHeight)
{
int lineNumber = 0;
int totalLines = m_lines.size();
m_width = m_inWidth ? m_inWidth : m_textWidth;
m_height = m_inHeight ? m_inHeight : m_textHeight;
unsigned int size = m_width * m_height * 4;
unsigned char* pBuffer = new unsigned char[size];
if(!pBuffer)
{
return nullptr;
}
memset(pBuffer, 0, size);
for (auto line = m_lines.begin() ; line != m_lines.end(); ++line)
{
FT_Vector pen = getPenForAlignment(*line, eAlignMask, lineNumber, totalLines);
drawText(*line, pBuffer, &pen);
lineNumber++;
}
*outWidth = m_width;
*outHeight = m_height;
reset();
return pBuffer;
}
FT_Vector CCFreeTypeFont::getPenForAlignment(FTLineInfo* pInfo, CCImage::ETextAlign eAlignMask,int lineNumber, int totalLines)
{
FT_Error error = 0;
FT_Vector pen;
int top;
int stringWidth = pInfo->bbox.xMax - pInfo->bbox.xMin;
int maxLineNumber = totalLines - 1;
pen.x = 0;
pen.y = 0;
switch(eAlignMask)
{
case CCImage::ETextAlign::kAlignTop: // Horizontal center and vertical top.
pen.x = ((m_width - stringWidth) / 2) - pInfo->bbox.xMin;
pen.y = pInfo->bbox.yMax + (lineNumber * m_lineHeight);
break;
case CCImage::ETextAlign::kAlignTopLeft: // Horizontal left and vertical top.
pen.x -=pInfo->bbox.xMin;
pen.y = pInfo->bbox.yMax + (lineNumber * m_lineHeight);
break;
case CCImage::ETextAlign::kAlignTopRight: // Horizontal right and vertical top.
pen.x = m_width - stringWidth - pInfo->bbox.xMin;
pen.y = pInfo->bbox.yMax + (lineNumber * m_lineHeight);
break;
case CCImage::ETextAlign::kAlignBottomRight: // Horizontal right and vertical bottom.
pen.x = m_width - stringWidth - pInfo->bbox.xMin;
pen.y = m_height + pInfo->bbox.yMin - ((maxLineNumber - lineNumber) * m_lineHeight);
break;
case CCImage::ETextAlign::kAlignBottom: // Horizontal center and vertical bottom.
pen.x = ((m_width - stringWidth) / 2) - pInfo->bbox.xMin;
pen.y = m_height + pInfo->bbox.yMin - ((maxLineNumber - lineNumber) * m_lineHeight);
break;
case CCImage::ETextAlign::kAlignBottomLeft: // Horizontal left and vertical bottom.
pen.x -=pInfo->bbox.xMin;
top = (m_height - m_textHeight) / 2;
pen.y = m_height + pInfo->bbox.yMin - ((maxLineNumber - lineNumber) * m_lineHeight);
break;
case CCImage::ETextAlign::kAlignCenter: // Horizontal center and vertical center
pen.x = ((m_width - stringWidth) / 2) - pInfo->bbox.xMin;
top = (m_height - m_textHeight) / 2;
pen.y = top + (lineNumber * m_lineHeight) + pInfo->bbox.yMax;
break;
case CCImage::ETextAlign::kAlignRight: // Horizontal right and vertical center.
pen.x = m_width - stringWidth - pInfo->bbox.xMin;
top = (m_height - m_textHeight) / 2;
pen.y = top + (lineNumber * m_lineHeight) + pInfo->bbox.yMax;
break;
case CCImage::ETextAlign::kAlignLeft: // Horizontal left and vertical center.
default:
pen.x -=pInfo->bbox.xMin;
top = (m_height - m_textHeight) / 2;
pen.y = top + (lineNumber * m_lineHeight) + pInfo->bbox.yMax;
break;
}
return pen;
}
void CCFreeTypeFont::drawText(FTLineInfo* pInfo, unsigned char* pBuffer, FT_Vector *pen)
{
auto glyphs = pInfo->glyphs;
for (auto glyph = glyphs.begin() ; glyph != glyphs.end(); ++glyph)
{
FT_Glyph image = glyph->image;
FT_Error error = FT_Glyph_To_Bitmap(&image, FT_RENDER_MODE_NORMAL, 0, 1);
if (!error)
{
FT_BitmapGlyph bit = (FT_BitmapGlyph)image;
draw_bitmap(pBuffer, &bit->bitmap, pen->x + glyph->pos.x + bit->left,pen->y - bit->top);
FT_Done_Glyph(image);
}
}
}
void CCFreeTypeFont::draw_bitmap(unsigned char* pBuffer, FT_Bitmap* bitmap, FT_Int x, FT_Int y)
{
FT_Int i, j, p, q;
FT_Int x_max = x + bitmap->width;
FT_Int y_max = y + bitmap->rows;
for (i = x, p = 0; i < x_max; i++, p++)
{
for ( j = y, q = 0; j < y_max; j++, q++ )
{
if (i < 0 || j < 0 || i >= m_width || j >= m_height)
continue;
unsigned char value = bitmap->buffer[q * bitmap->width + p];
if(value > 0)
{
FT_Int index = (j * m_width * 4) + (i * 4);
pBuffer[index++] = 0xff;
pBuffer[index++] = 0xff;
pBuffer[index++] = 0xff;
pBuffer[index++] = value;
}
}
}
}
void CCFreeTypeFont::endLine()
{
if(m_currentLine)
{
m_lines.push_back(m_currentLine);
compute_bbox(m_currentLine->glyphs, &m_currentLine->bbox);
m_currentLine->width = m_currentLine->bbox.xMax - m_currentLine->bbox.xMin;
m_textWidth = max(m_textWidth,m_currentLine->bbox.xMax - m_currentLine->bbox.xMin);
m_textHeight += m_lineHeight;
m_currentLine = NULL;
}
}
void CCFreeTypeFont::newLine()
{
m_currentLine = new FTLineInfo();
m_currentLine->width = 0;
m_currentLine->pen.x = 0;
m_currentLine->pen.y = 0;
}
FT_Error CCFreeTypeFont::addLine(const std::string& line)
{
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';
int maxWidth = m_inWidth ? m_inWidth : m_windowWidth;
newLine();
FT_Vector pen = m_currentLine->pen;
FT_GlyphSlot slot = m_face->glyph;
FT_UInt glyph_index;
FT_UInt previous = 0;
FT_Error error = 0;
unsigned int numGlyphs = 0;
FT_Bool useKerning = FT_HAS_KERNING(m_face);
int n = 0;
while (n < num_chars)
{
TGlyph glyph;
/* convert character code to glyph index */
FT_ULong c = pwszBuffer[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;
if (pen.x > maxWidth)
{
m_currentLine->pen = pen;
endLine();
newLine();
pen = m_currentLine->pen;
previous = 0;
n--;
}
else
{
m_currentLine->glyphs.push_back(glyph);
/* record current glyph index */
previous = glyph_index;
}
}
if (m_currentLine)
{
m_currentLine->pen = pen;
endLine();
}
CC_SAFE_DELETE_ARRAY(pwszBuffer);
return error;
}
FT_Error CCFreeTypeFont::initGlyphs(const char* text)
{
FT_Error error = 0;
std::stringstream stringStream(text);
std::string line;
m_textWidth = 0;
m_textHeight = 0;
// the height of a line of text based on the max height of a glyph in the font size
m_lineHeight = ((m_face->size->metrics.ascender) >> 6) - ((m_face->size->metrics.descender) >> 6);
m_lines.clear();
while(std::getline(stringStream, line) && !error)
{
addLine(line);
}
return error;
}
void CCFreeTypeFont::compute_bbox(std::vector<TGlyph>& glyphs, FT_BBox *abbox)
{
FT_BBox bbox;
FT_BBox glyph_bbox;
/* initialize string bbox to "empty" values */
bbox.xMin = 32000;
bbox.xMax = -32000;
// use the max and min values for the entire font face
bbox.yMin = (m_face->size->metrics.descender) >> 6;
bbox.yMax = (m_face->size->metrics.ascender) >> 6;
/* for each glyph image, compute its bounding box, */
/* translate it, and grow the string bbox */
for (auto glyph = glyphs.begin() ; glyph != glyphs.end(); ++glyph)
{
FT_Glyph_Get_CBox(glyph->image, ft_glyph_bbox_pixels, &glyph_bbox);
glyph_bbox.xMin += glyph->pos.x;
glyph_bbox.xMax += glyph->pos.x;
glyph_bbox.yMin += glyph->pos.y;
glyph_bbox.yMax += glyph->pos.y;
if (glyph_bbox.xMin < bbox.xMin)
bbox.xMin = glyph_bbox.xMin;
if (glyph_bbox.yMin < bbox.yMin)
bbox.yMin = glyph_bbox.yMin;
if (glyph_bbox.xMax > bbox.xMax)
bbox.xMax = glyph_bbox.xMax;
if (glyph_bbox.yMax > bbox.yMax)
bbox.yMax = glyph_bbox.yMax;
}
/* check that we really grew the string bbox */
if (bbox.xMin > bbox.xMax)
{
bbox.xMin = 0;
bbox.yMin = 0;
bbox.xMax = 0;
bbox.yMax = 0;
}
/* return string bbox */
*abbox = bbox;
}
unsigned char* CCFreeTypeFont::loadFont(const char *pFontName, unsigned long *size)
{
std::string lowerCase(pFontName);
std::string path(pFontName);
for (unsigned int i = 0; i < lowerCase.length(); ++i)
{
lowerCase[i] = tolower(lowerCase[i]);
}
if (std::string::npos == lowerCase.find("fonts/"))
{
path = "fonts/";
path += pFontName;
}
if (std::string::npos == lowerCase.find(".ttf"))
{
path += ".ttf";
}
std::string fullpath = CCFileUtils::sharedFileUtils()->fullPathForFilename(path.c_str());
return CCFileUtils::sharedFileUtils()->getFileData(fullpath.c_str(), "rb", size);
}
unsigned char* CCFreeTypeFont::loadSystemFont(const char *pFontName, unsigned long *size)
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_WP8)
return nullptr;
#else
std::string aName(pFontName);
unsigned char* pBuffer = nullptr;
HRESULT hr = S_OK;
IDWriteFactory *writeFactory = nullptr;
IDWriteFontCollection *fontCollection = nullptr;
IDWriteFontFamily *fontFamily = nullptr;
IDWriteFont *matchingFont = nullptr;
IDWriteFontFace *fontFace = nullptr;
IDWriteFontFile *fontFile = nullptr;
IDWriteFontFileLoader *fontFileLoader = nullptr;
IDWriteFontFileStream *fontFileStream = nullptr;
UINT32 index;
BOOL exists;
std::wstring fontNameW;
const void *fontFileReferenceKey = nullptr;
UINT32 fontFileReferenceKeySize;
void *fragmentContext = nullptr;
for (unsigned int i = 0; i < aName.length(); ++i)
{
aName[i] = tolower(aName[i]);
}
fontNameW.assign(aName.begin(), aName.end());
//create the factory
hr = DWriteCreateFactory(DWRITE_FACTORY_TYPE_SHARED, __uuidof(IDWriteFactory), reinterpret_cast<IUnknown**>(&writeFactory));
if(SUCCEEDED(hr))
{
//obtain the fonts owned by the machine
hr = writeFactory->GetSystemFontCollection(&fontCollection, TRUE);
}
//get the font
if(SUCCEEDED(hr))
{
hr = fontCollection->FindFamilyName(fontNameW.c_str(), &index, &exists);
if(SUCCEEDED(hr) && exists)
{
hr = fontCollection->GetFontFamily(index, &fontFamily);
if(SUCCEEDED(hr))
{
hr = fontFamily->GetFirstMatchingFont(DWRITE_FONT_WEIGHT_REGULAR, DWRITE_FONT_STRETCH_NORMAL, DWRITE_FONT_STYLE_NORMAL, &matchingFont);
}
if(SUCCEEDED(hr))
{
hr = matchingFont->CreateFontFace(&fontFace);
}
if(SUCCEEDED(hr))
{
UINT32 numberOfFiles = 1;
hr = fontFace->GetFiles(&numberOfFiles, &fontFile);
}
if(SUCCEEDED(hr))
{
//create the font file stream
hr = fontFile->GetReferenceKey(&fontFileReferenceKey, &fontFileReferenceKeySize);
}
if(SUCCEEDED(hr))
{
hr = fontFile->GetLoader(&fontFileLoader);
}
if(SUCCEEDED(hr))
{
hr = fontFileLoader->CreateStreamFromKey(fontFileReferenceKey, fontFileReferenceKeySize, &fontFileStream);
}
if(SUCCEEDED(hr))
{
//finally get the font file dat
UINT64 fileSize;
const void *fragmentStart = nullptr;
hr = fontFileStream->GetFileSize(&fileSize);
if(SUCCEEDED(hr))
{
hr = fontFileStream->ReadFileFragment(&fragmentStart, 0, fileSize, &fragmentContext);
}
if(SUCCEEDED(hr))
{
pBuffer = (unsigned char*)malloc((size_t)fileSize);
memcpy(pBuffer, fragmentStart, (size_t)fileSize);
*size = (unsigned long)fileSize;
}
}
}
}
//clean up all the DWrite stuff
if(fontFileStream)
{
fontFileStream->ReleaseFileFragment(fragmentContext);
fontFileStream->Release();
}
if(fontFileLoader)
{
fontFileLoader->Release();
}
if(fontFile)
{
fontFile->Release();
}
if(fontFace)
{
fontFace->Release();
}
if(matchingFont)
{
matchingFont->Release();
}
if(fontFamily)
{
fontFamily->Release();
}
if(fontCollection)
{
fontCollection->Release();
}
if(writeFactory)
{
writeFactory->Release();
}
return pBuffer;
#endif
}
NS_CC_ENDcocos2dx windows phone平台下CCLabelTTF自动换行的实现(2),布布扣,bubuko.com
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