axmol/cocos2dx/platform/nacl/CCImage.cpp

/****************************************************************************
Copyright (c) 2013 The Chromium Authors

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
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all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#include <string.h>

#include <vector>
#include <string>
#include <sstream>
#include <algorithm>

#include "platform/CCFileUtils.h"
#include "platform/CCPlatformMacros.h"
#define __CC_PLATFORM_IMAGE_CPP__
#include "platform/CCImageCommon_cpp.h"
#include "platform/CCImage.h"
#include "platform/linux/CCApplication.h"

#include "ft2build.h"
#include "CCStdC.h"

#include FT_FREETYPE_H

#define szFont_kenning 2

#define SHIFT6(num) (num>>6)

using namespace std;

struct TextLine {
    int iLineWidth;
    wchar_t* text;
};

NS_CC_BEGIN

class BitmapDC
{
public:
    BitmapDC() : _data(NULL), _cachedFont(NULL)
    {
        libError = FT_Init_FreeType(&_library);
        iInterval = szFont_kenning;
        reset();
    }

    ~BitmapDC()
    {
        if (_cachedFont)
            FT_Done_Face(_cachedFont);
        FT_Done_FreeType(_library);
        reset();
    }

    void reset()
    {
        iMaxLineWidth = 0;
        iMaxLineHeight = 0;
        //Free all text lines
        size_t size = vLines.size();
        for (size_t i=0; i<size; ++i)
        {
            TextLine line = vLines[i];
            free(line.text);
        }
        vLines.clear();
    }

    int utf8(char **p)
    {
        if ((**p & 0x80) == 0x00)
        {
            int a = *((*p)++);

            return a;
        }
        if ((**p & 0xE0) == 0xC0)
        {
            int a = *((*p)++) & 0x1F;
            int b = *((*p)++) & 0x3F;

            return (a << 6) | b;
        }
        if ((**p & 0xF0) == 0xE0)
        {
            int a = *((*p)++) & 0x0F;
            int b = *((*p)++) & 0x3F;
            int c = *((*p)++) & 0x3F;

            return (a << 12) | (b << 6) | c;
        }
        if ((**p & 0xF8) == 0xF0)
        {
            int a = *((*p)++) & 0x07;
            int b = *((*p)++) & 0x3F;
            int c = *((*p)++) & 0x3F;
            int d = *((*p)++) & 0x3F;

            return (a << 18) | (b << 12) | (c << 8) | d;
        }
        return 0;
    }

    void buildLine(wchar_t* buf, size_t buf_len, FT_Face face, int iCurXCursor, FT_UInt cLastChar)
    {
        TextLine oTempLine;
        wchar_t* text = (wchar_t*)malloc(sizeof(wchar_t) * (buf_len+1));
        memcpy(text, buf, sizeof(wchar_t) * buf_len);
        text[buf_len] = '\0';
        oTempLine.text = text;

        //get last glyph
        FT_Load_Char(face, cLastChar, FT_LOAD_DEFAULT);

        oTempLine.iLineWidth = iCurXCursor;// - SHIFT6((face->glyph->metrics.horiAdvance + face->glyph->metrics.horiBearingX - face->glyph->metrics.width))/*-iInterval*/;//TODO interval
        iMaxLineWidth = MAX(iMaxLineWidth, oTempLine.iLineWidth);

        vLines.push_back(oTempLine);
    }

    bool divideString(FT_Face face, const char* sText, int iMaxWidth, int iMaxHeight)
    {
        int iError = 0;
        const char* pText = sText;

        FT_UInt unicode = utf8((char**)&pText);
        iError = FT_Load_Char(face, unicode, FT_LOAD_DEFAULT);
        if (iError)
            return false;

        int iCurXCursor = -SHIFT6(face->glyph->metrics.horiBearingX);

        FT_UInt cLastCh = 0;

        pText = sText;
        size_t text_len = 0;
        wchar_t* text_buf = (wchar_t*) malloc(sizeof(wchar_t) * strlen(sText));
        while ((unicode=utf8((char**)&pText)))
        {
            if (unicode == '\n')
            {
                buildLine(text_buf, text_len, face, iCurXCursor, cLastCh);
                text_len = 0;

                iError = FT_Load_Char(face, unicode, FT_LOAD_DEFAULT);
                if (iError) {
                    free(text_buf);
                    return false;
                }
                iCurXCursor = -SHIFT6(face->glyph->metrics.horiBearingX);
                continue;
            }

            iError = FT_Load_Char(face, unicode, FT_LOAD_DEFAULT);

            if (iError) {
                free(text_buf);
                return false;
            }

            //check its width
            //divide it when exceeding
            if ((iMaxWidth > 0
                            && iCurXCursor + SHIFT6(face->glyph->metrics.width)
                            > iMaxWidth)) {
                buildLine(text_buf, text_len, face , iCurXCursor, cLastCh);
                text_len = 0;

                iCurXCursor = -SHIFT6(face->glyph->metrics.horiBearingX);
            }

            cLastCh = unicode;
            text_buf[text_len] = unicode;
            ++text_len;
            iCurXCursor += SHIFT6(face->glyph->metrics.horiAdvance) + iInterval;
        }

        if (iError)
        {
            free(text_buf);
            return false;
        }

        buildLine(text_buf, text_len, face, iCurXCursor, cLastCh);
        free(text_buf);

        return true;
    }

    /**
     * compute the start pos of every line
     *
     * return >0 represent the start x pos of the line
     * while -1 means fail
     *
     */
    int computeLineStart(FT_Face face, Image::ETextAlign eAlignMask, FT_UInt unicode,
            int iLineIndex)
    {
        int iRet;
        int iError = FT_Load_Char(face, unicode, FT_LOAD_DEFAULT);
        if (iError) {
            return -1;
        }

        if (eAlignMask == Image::kAlignCenter) {
            iRet = (iMaxLineWidth - vLines[iLineIndex].iLineWidth) / 2
            - SHIFT6(face->glyph->metrics.horiBearingX );

        } else if (eAlignMask == Image::kAlignRight) {
            iRet = (iMaxLineWidth - vLines[iLineIndex].iLineWidth)
            - SHIFT6(face->glyph->metrics.horiBearingX );
        } else {
            // left or other situation
            iRet = -SHIFT6(face->glyph->metrics.horiBearingX );
        }
        return iRet;
    }

    int computeLineStartY(FT_Face face, Image::ETextAlign eAlignMask, int txtHeight, int borderHeight)
    {
        int iRet = 0;
        if (eAlignMask == Image::kAlignCenter || eAlignMask == Image::kAlignLeft ||
            eAlignMask == Image::kAlignRight ) {
            //vertical center
            iRet = (borderHeight - txtHeight)/2;

        } else if (eAlignMask == Image::kAlignBottomRight ||
                   eAlignMask == Image::kAlignBottom ||
                   eAlignMask == Image::kAlignBottomLeft ) {
            //vertical bottom
            iRet = borderHeight - txtHeight;
        }
        iRet += SHIFT6(face->size->metrics.ascender);
        return iRet;
    }

    bool renderLine(FT_Face face, const wchar_t* text_ptr, int* iCurXCursor, int iCurYCursor)
    {
        assert(iCurYCursor > 0);
        size_t text_len = wcslen(text_ptr);
        for (size_t i=0; i<text_len; ++i)
        {
            int iError = FT_Load_Char(face, text_ptr[i], FT_LOAD_RENDER);
            if (iError)
                return false;

            //  convert glyph to bitmap with 256 gray
            //  and get the bitmap
            FT_Bitmap& bitmap = face->glyph->bitmap;

            int yoffset = iCurYCursor - SHIFT6(face->glyph->metrics.horiBearingY);
            int xoffset = *iCurXCursor + SHIFT6(face->glyph->metrics.horiBearingX);
            for (int i = 0; i < bitmap.rows; ++i)
            {
                for (int j = 0; j < bitmap.width; ++j)
                {
                    unsigned char cTemp = bitmap.buffer[i * bitmap.width + j];
                    if (cTemp == 0) continue;

                    //  if it has gray>0 we set show it as 1, o otherwise
                    int iY = yoffset + i;
                    int iX = xoffset + j;

                    if (iY < 0)
                    {
                        //truncate if drawing below first line
                        assert(iY >= -1);
                        continue;
                    }

                    if (iY >= iMaxLineHeight)
                    {
                        //exceed the height truncate
                        assert(iY <= iMaxLineHeight + 1);
                        continue;
                    }

                    int iTemp = cTemp << 24 | cTemp << 16 | cTemp << 8 | cTemp;
                    int data_offset = iY * iMaxLineWidth + iX;
                    assert(data_offset >= 0);
                    assert(data_offset < _dataSize);
                    _data[data_offset] = iTemp;
                }
            }

            //step to next glyph
            *iCurXCursor += SHIFT6(face->glyph->metrics.horiAdvance) + iInterval;
        }
        return true;
    }

    bool renderLines(FT_Face face, Image::ETextAlign eAlignMask, int iCurYCursor)
    {
        size_t lines = vLines.size();
        for (size_t i = 0; i < lines; i++)
        {
            const wchar_t* text_ptr = vLines[i].text;

            // initialize the origin cursor
            int iCurXCursor = computeLineStart(face, eAlignMask, text_ptr[0], i);
            if (!renderLine(face, text_ptr, &iCurXCursor, iCurYCursor))
                return false;

            iCurYCursor += SHIFT6(face->size->metrics.ascender) -
                SHIFT6(face->size->metrics.descender);
        }
        return true;
    }

    bool getBitmap(const char *text, int nWidth, int nHeight, Image::ETextAlign eAlignMask, const char * pFontName, float fontSize)
    {
        FT_Error iError;
        if (libError)
            return false;

        std::string fontfile = pFontName;
        std::string fontfileOrig = std::string(fontfile);

        std::string ext = fileNameExtension(fontfile);
        if (ext.empty() || (ext != "ttf" && ext != "TTF"))
        {
            fontfile += ".ttf" ;
        }

        iError = openFont(fontfile, fontfileOrig);
        // try with fonts prefixed
        if (iError && !startsWith(fontfile,"fonts/") )
        {
            fontfile = std::string("fonts/") + fontfile;
            iError = openFont(fontfile, fontfileOrig);
        }

        if (iError)
        {
            // try lowercase version
            std::transform(fontfile.begin(), fontfile.end(), fontfile.begin(), ::tolower);
            iError = openFont(fontfile, fontfileOrig);
            if (iError)
            {
                // try default font
                CCLOG("font missing (%s) falling back to default font", fontfileOrig.c_str());
                iError = openFont("fonts/Marker Felt.ttf", fontfileOrig);
                if (iError)
                    CCLOG("default font missing (fonts/Marker Felt.ttf)");
            }
        }
        if (iError)
            return false;

        FT_Face face = _cachedFont;

        //select utf8 charmap
        iError = FT_Select_Charmap(face,FT_ENCODING_UNICODE);
        if (iError)
            return false;

        iError = FT_Set_Pixel_Sizes(face, fontSize, fontSize);
        if (iError)
            return false;

        if (!divideString(face, text, nWidth, nHeight))
            return false;

        //compute the final line width
        iMaxLineWidth = MAX(iMaxLineWidth, nWidth);

        iMaxLineHeight = SHIFT6(face->size->metrics.ascender) - SHIFT6(face->size->metrics.descender);
        iMaxLineHeight *= vLines.size();

        int txtHeight = iMaxLineHeight;

        //compute the final line height
        iMaxLineHeight = MAX(iMaxLineHeight, nHeight);

        // create _data as render target
        _dataSize = iMaxLineWidth * iMaxLineHeight;
        _data = new int[_dataSize];
        memset(_data, 0, _dataSize*sizeof(*_data));

        //iCurYCursor = SHIFT6(face->size->metrics.ascender);
        int iCurYCursor = computeLineStartY(face, eAlignMask, txtHeight, iMaxLineHeight);
        if (!renderLines(face, eAlignMask, iCurYCursor))
            return false;

        // success;
        return true;
    }

public:
    FT_Library _library;

    int *_data;
    // size of _data in words
    int _dataSize;
    int libError;
    vector<TextLine> vLines;
    int iInterval;
    int iMaxLineWidth;
    int iMaxLineHeight;
private:
    bool startsWith(const std::string& str, const std::string& what);
    /**
     * Attempt to open font file, and cache it if successful.
     */
    int openFont(const std::string& fontName, const std::string& fontNameOrig);
    std::string fileNameExtension(const std::string& pathName);

    FT_Face _cachedFont;
    std::string _cachedFontname;
    std::string _cachedFontnameOrig;
};

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

bool Image::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();

        //const char* pFullFontName = FileUtils::getInstance()->fullPathFromRelativePath(pFontName);

        CC_BREAK_IF(! dc.getBitmap(pText, nWidth, nHeight, eAlignMask, pFontName, nSize));

        // assign the dc._data to _data in order to save time
        _data = (unsigned char*)dc._data;
        CC_BREAK_IF(! _data);

        _width = (short)dc.iMaxLineWidth;
        _height = (short)dc.iMaxLineHeight;
        _hasAlpha = true;
        _preMulti = true;
        _bitsPerComponent = 8;

        bRet = true;

        dc.reset();
    } while (0);

    if (!bRet)
      CCLOG("CCImage::initWithString failed");

    //do nothing
    return bRet;
}

std::string BitmapDC::fileNameExtension(const std::string& pathName)
{
    std::string ext ;
    std::string::size_type pos = pathName.find_last_of(".") ;
    if (pos != std::string::npos && pos != pathName.size()-1 )
    {
        ext = pathName.substr(pos+1) ;
    }

    return ext ;
}

bool BitmapDC::startsWith(const std::string& str, const std::string& what)
{
    bool result = false ;
    if (what.size() <= str.size())
    {
        result = (str.substr(0, what.size()) == what);
    }
    return result ;
}

int BitmapDC::openFont(const std::string& fontName, const std::string& fontNameOrig)
{
    // try to satisfy request based on currently cached font.
    if (fontNameOrig == _cachedFontnameOrig)
      return 0;

    if (fontName == _cachedFontname)
      return 0;

    FT_Face face;
    int iError = FT_New_Face(_library, fontName.c_str(), 0, &face);
    if (iError)
      return iError;

    // free existing cached font
    if (_cachedFont)
      FT_Done_Face(_cachedFont);

    // cache newly loaded font
    _cachedFontnameOrig = fontNameOrig;
    _cachedFontname = fontName;
    _cachedFont = face;
    return 0;
}

NS_CC_END