axmol/cocos/platform/linux/CCDevice-linux.cpp

/****************************************************************************
Copyright (c) 2011      Laschweinski
Copyright (c) 2013-2014 Chukong 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
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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

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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
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#include "platform/CCPlatformConfig.h"
#if CC_TARGET_PLATFORM == CC_PLATFORM_LINUX

#include "platform/CCDevice.h"
#include <X11/Xlib.h>
#include <stdio.h>

#include <algorithm>
#include <vector>
#include <map>
#include <string>
#include <sstream>
#include <fontconfig/fontconfig.h>
#include "platform/CCFileUtils.h"

#include "ft2build.h"
#include FT_FREETYPE_H

using namespace std;

// as FcFontMatch is quite an expensive call, cache the results of getFontFile
static std::map<std::string, std::string> fontCache;

struct LineBreakGlyph {
    FT_UInt glyphIndex;
    int paintPosition;
    int glyphWidth;

    int bearingX;
    int kerning;
    int horizAdvance;
};

struct LineBreakLine {
    LineBreakLine() : lineWidth(0) {}

    std::vector<LineBreakGlyph> glyphs;
    int lineWidth;

    void reset() {
        glyphs.clear();
        lineWidth = 0;
    }

    void calculateWidth() {
        lineWidth = 0;
        if ( glyphs.empty() == false ) {
            lineWidth = glyphs.at(glyphs.size() - 1).paintPosition + glyphs.at(glyphs.size() - 1).glyphWidth;
        }
    }
};

NS_CC_BEGIN

int Device::getDPI()
{
    static int dpi = -1;
    if (dpi == -1)
    {
        Display *dpy;
        char *displayname = NULL;
        int scr = 0; /* Screen number */
        dpy = XOpenDisplay (displayname);
        /*
         * there are 2.54 centimeters to an inch; so there are 25.4 millimeters.
         *
         *     dpi = N pixels / (M millimeters / (25.4 millimeters / 1 inch))
         *         = N pixels / (M inch / 25.4)
         *         = N * 25.4 pixels / M inch
         */
        double xres = ((((double) DisplayWidth(dpy,scr)) * 25.4) / 
            ((double) DisplayWidthMM(dpy,scr)));
        dpi = (int) (xres + 0.5);
        //printf("dpi = %d\n", dpi);
        XCloseDisplay (dpy);
    }
    return dpi;
}

void Device::setAccelerometerEnabled(bool isEnabled)
{

}

void Device::setAccelerometerInterval(float interval)
{

}

class BitmapDC
{
public:
    BitmapDC() {
        libError = FT_Init_FreeType( &library );
        FcInit();
        _data = NULL;
        reset();
    }

    ~BitmapDC() {
        FT_Done_FreeType(library);
        FcFini();
        
        reset();
    }

    void reset() {
        iMaxLineWidth = 0;
        iMaxLineHeight = 0;
        textLines.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;
    }

    bool isBreakPoint(FT_UInt currentCharacter, FT_UInt previousCharacter) {
        if ( previousCharacter == '-' || previousCharacter == '/' || previousCharacter == '\\' ) {
            // we can insert a line break after one of these characters
            return true;
        }
        return false;
    }

    bool divideString(FT_Face face, const char* sText, int iMaxWidth, int iMaxHeight) {
        const char* pText = sText;
        textLines.clear();
        iMaxLineWidth = 0;

        FT_UInt unicode;
        FT_UInt prevCharacter = 0;
        FT_UInt glyphIndex = 0;
        FT_UInt prevGlyphIndex = 0;
        FT_Vector delta;
        LineBreakLine currentLine;

        int currentPaintPosition = 0;
        int lastBreakIndex = -1;
        bool hasKerning = FT_HAS_KERNING( face );
        while ((unicode=utf8((char**)&pText))) {
            if (unicode == '\n') {
                currentLine.calculateWidth();
                iMaxLineWidth = max(iMaxLineWidth, currentLine.lineWidth);
                textLines.push_back(currentLine);
                currentLine.reset();
                prevGlyphIndex = 0;
                prevCharacter = 0;
                lastBreakIndex = -1;
                currentPaintPosition = 0;
                continue;
            }

            if ( isBreakPoint(unicode, prevCharacter) ) {
                lastBreakIndex = currentLine.glyphs.size() - 1;
            }

            glyphIndex = FT_Get_Char_Index(face, unicode);
            if (FT_Load_Glyph(face, glyphIndex, FT_LOAD_DEFAULT)) {
                return false;
            }

            if (iswspace(unicode)) {
                currentPaintPosition += face->glyph->metrics.horiAdvance >> 6;
                prevGlyphIndex = glyphIndex;
                prevCharacter = unicode;
                lastBreakIndex = currentLine.glyphs.size();
                continue;
            }

            LineBreakGlyph glyph;
            glyph.glyphIndex = glyphIndex;
            glyph.glyphWidth = face->glyph->metrics.width >> 6;
            glyph.bearingX = face->glyph->metrics.horiBearingX >> 6;
            glyph.horizAdvance = face->glyph->metrics.horiAdvance >> 6;
            glyph.kerning = 0;

            if (prevGlyphIndex != 0 && hasKerning) {
                FT_Get_Kerning(face, prevGlyphIndex, glyphIndex, FT_KERNING_DEFAULT, &delta);
                glyph.kerning = delta.x >> 6;
            }

            if (iMaxWidth > 0 && currentPaintPosition + glyph.bearingX + glyph.kerning + glyph.glyphWidth > iMaxWidth) {

                int glyphCount = currentLine.glyphs.size();
                if ( lastBreakIndex >= 0 && lastBreakIndex < glyphCount && currentPaintPosition + glyph.bearingX + glyph.kerning + glyph.glyphWidth - currentLine.glyphs.at(lastBreakIndex).paintPosition < iMaxWidth ) {
                    // we insert a line break at our last break opportunity
                    std::vector<LineBreakGlyph> tempGlyphs;
                    std::vector<LineBreakGlyph>::iterator it = currentLine.glyphs.begin();
                    std::advance(it, lastBreakIndex);
                    tempGlyphs.insert(tempGlyphs.begin(), it, currentLine.glyphs.end());
                    currentLine.glyphs.erase(it, currentLine.glyphs.end());
                    currentLine.calculateWidth();
                    iMaxLineWidth = max(iMaxLineWidth, currentLine.lineWidth);
                    textLines.push_back(currentLine);
                    currentLine.reset();
                    currentPaintPosition = 0;
                    for ( it = tempGlyphs.begin(); it != tempGlyphs.end(); it++ ) {
                        if ( currentLine.glyphs.empty() ) {
                            currentPaintPosition = -(*it).bearingX;
                            (*it).kerning = 0;
                        }
                        (*it).paintPosition = currentPaintPosition + (*it).bearingX + (*it).kerning;
                        currentLine.glyphs.push_back((*it));
                        currentPaintPosition += (*it).kerning + (*it).horizAdvance;
                    }
                } else {
                    // the current word is too big to fit into one line, insert line break right here
                    currentPaintPosition = 0;
                    glyph.kerning = 0;
                    currentLine.calculateWidth();
                    iMaxLineWidth = max(iMaxLineWidth, currentLine.lineWidth);
                    textLines.push_back(currentLine);
                    currentLine.reset();
                }

                prevGlyphIndex = 0;
                prevCharacter = 0;
                lastBreakIndex = -1;
            } else {
                prevGlyphIndex = glyphIndex;
                prevCharacter = unicode;
            }

            if ( currentLine.glyphs.empty() ) {
                currentPaintPosition = -glyph.bearingX;
            }
            glyph.paintPosition = currentPaintPosition + glyph.bearingX + glyph.kerning;
            currentLine.glyphs.push_back(glyph);
            currentPaintPosition += glyph.kerning + glyph.horizAdvance;
        }

        if ( currentLine.glyphs.empty() == false ) {
            currentLine.calculateWidth();
            iMaxLineWidth = max(iMaxLineWidth, currentLine.lineWidth);
            textLines.push_back(currentLine);
        }
        return true;
    }

    /**
     * compute the start pos of every line
     */
    int computeLineStart(FT_Face face, Device::TextAlign eAlignMask, int line) {
                int lineWidth = textLines.at(line).lineWidth;
        if (eAlignMask == Device::TextAlign::CENTER || eAlignMask == Device::TextAlign::TOP || eAlignMask == Device::TextAlign::BOTTOM) {
            return (iMaxLineWidth - lineWidth) / 2;
        } else if (eAlignMask == Device::TextAlign::RIGHT || eAlignMask == Device::TextAlign::TOP_RIGHT || eAlignMask == Device::TextAlign::BOTTOM_RIGHT) {
            return (iMaxLineWidth - lineWidth);
        }

        // left or other situation
        return 0;
    }

    int computeLineStartY( FT_Face face, Device::TextAlign eAlignMask, int txtHeight, int borderHeight ){
        int baseLinePos = ceilf(FT_MulFix( face->bbox.yMax, face->size->metrics.y_scale )/64.0f);
        if (eAlignMask == Device::TextAlign::CENTER || eAlignMask == Device::TextAlign::LEFT || eAlignMask == Device::TextAlign::RIGHT) {
            //vertical center
            return (borderHeight - txtHeight) / 2 + baseLinePos;
        } else if (eAlignMask == Device::TextAlign::BOTTOM_RIGHT || eAlignMask == Device::TextAlign::BOTTOM || eAlignMask == Device::TextAlign::BOTTOM_LEFT) {
            //vertical bottom
            return borderHeight - txtHeight + baseLinePos;
        }

        // top alignment
        return baseLinePos;
    }

    std::string getFontFile(const char* family_name) {
        std::string fontPath = family_name;

        std::map<std::string, std::string>::iterator it = fontCache.find(family_name);
        if ( it != fontCache.end() ) {
            return it->second;
        }

        // check if the parameter is a font file shipped with the application
        std::string lowerCasePath = fontPath;
        std::transform(lowerCasePath.begin(), lowerCasePath.end(), lowerCasePath.begin(), ::tolower);
        if ( lowerCasePath.find(".ttf") != std::string::npos ) {
            fontPath = cocos2d::FileUtils::getInstance()->fullPathForFilename(fontPath.c_str());

            FILE *f = fopen(fontPath.c_str(), "r");
            if ( f ) {
                fclose(f);
                fontCache.insert(std::pair<std::string, std::string>(family_name, fontPath));
                return fontPath;
            }
        }

        // use fontconfig to match the parameter against the fonts installed on the system
        FcPattern *pattern = FcPatternBuild (0, FC_FAMILY, FcTypeString, family_name, (char *) 0);
        FcConfigSubstitute(0, pattern, FcMatchPattern);
        FcDefaultSubstitute(pattern);

        FcResult result;
        FcPattern *font = FcFontMatch(0, pattern, &result);
        if ( font ) {
            FcChar8 *s = NULL;
            if ( FcPatternGetString(font, FC_FILE, 0, &s) == FcResultMatch ) {
                fontPath = (const char*)s;

                FcPatternDestroy(font);
                FcPatternDestroy(pattern);

                fontCache.insert(std::pair<std::string, std::string>(family_name, fontPath));
                return fontPath;
            }
            FcPatternDestroy(font);
        }
        FcPatternDestroy(pattern);

        return family_name;
    }

    bool getBitmap(const char *text, const FontDefinition& textDefinition, Device::TextAlign eAlignMask) {
        if (libError) {
            return false;
        }

        FT_Face face;
        std::string fontfile = getFontFile(textDefinition._fontName.c_str());
        if ( FT_New_Face(library, fontfile.c_str(), 0, &face) ) {
            //no valid font found use default
            if ( FT_New_Face(library, "/usr/share/fonts/truetype/freefont/FreeSerif.ttf", 0, &face) ) {
                return false;
            }
        }

        //select utf8 charmap
        if ( FT_Select_Charmap(face, FT_ENCODING_UNICODE) ) {
            FT_Done_Face(face);
            return false;
        }

        if ( FT_Set_Pixel_Sizes(face, textDefinition._fontSize, textDefinition._fontSize) ) {
            FT_Done_Face(face);
            return false;
        }

        if ( divideString(face, text, textDefinition._dimensions.width, textDefinition._dimensions.height) == false ) {
            FT_Done_Face(face);
            return false;
        }

        //compute the final line width
        iMaxLineWidth = MAX(iMaxLineWidth, textDefinition._dimensions.width);

        //compute the final line height
        iMaxLineHeight = ceilf(FT_MulFix( face->bbox.yMax - face->bbox.yMin, face->size->metrics.y_scale )/64.0f);
        int lineHeight = face->size->metrics.height>>6;
        if ( textLines.size() > 0 ) {
            iMaxLineHeight += (lineHeight * (textLines.size() -1));
        }
        int txtHeight = iMaxLineHeight;
        iMaxLineHeight = MAX(iMaxLineHeight, textDefinition._dimensions.height);

        _data = (unsigned char*)malloc(sizeof(unsigned char) * (iMaxLineWidth * iMaxLineHeight * 4));
        memset(_data,0, iMaxLineWidth * iMaxLineHeight*4);

        int iCurYCursor = computeLineStartY(face, eAlignMask, txtHeight, iMaxLineHeight);

        int lineCount = textLines.size();
        for (int line = 0; line < lineCount; line++) {
            int iCurXCursor = computeLineStart(face, eAlignMask, line);

            int glyphCount = textLines.at(line).glyphs.size();
            for (int i = 0; i < glyphCount; i++) {
                LineBreakGlyph glyph = textLines.at(line).glyphs.at(i);

                if (FT_Load_Glyph(face, glyph.glyphIndex, FT_LOAD_RENDER)) {
                    continue;
                }

                FT_Bitmap& bitmap = face->glyph->bitmap;
                int yoffset = iCurYCursor - (face->glyph->metrics.horiBearingY >> 6);
                int xoffset = iCurXCursor + glyph.paintPosition;

                for (int y = 0; y < bitmap.rows; ++y) {
                    int iY = yoffset + y;
                    if (iY>=iMaxLineHeight) {
                        //exceed the height truncate
                        break;
                    }
                    iY *= iMaxLineWidth;

                    int bitmap_y = y * bitmap.width;

                    for (int x = 0; x < bitmap.width; ++x) {
                        unsigned char cTemp = bitmap.buffer[bitmap_y + x];
                        if (cTemp == 0) {
                            continue;
                        }

                        int iX = xoffset + x;
                        //FIXME:wrong text color
                        int iTemp = cTemp << 24 | cTemp << 16 | cTemp << 8 | cTemp;
                        *(int*) &_data[(iY + iX) * 4 + 0] = iTemp;
                    }
                }
            }
            // step to next line
            iCurYCursor += lineHeight;
        }

        //  free face
        FT_Done_Face(face);
        return true;
    }

public:
    FT_Library library;

    unsigned char *_data;
    int libError;
    std::vector<LineBreakLine> textLines;
    int iMaxLineWidth;
    int iMaxLineHeight;
};

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

Data Device::getTextureDataForText(const char * text, const FontDefinition& textDefinition, TextAlign align, int &width, int &height, bool& hasPremultipliedAlpha)
{
    Data ret;
    do 
    {
        BitmapDC &dc = sharedBitmapDC();

        CC_BREAK_IF(! dc.getBitmap(text, textDefinition, align));
        CC_BREAK_IF(! dc._data);
        width = dc.iMaxLineWidth;
        height = dc.iMaxLineHeight;
        dc.reset();
        ret.fastSet(dc._data,width * height * 4);
        hasPremultipliedAlpha = true;
    } while (0);

    return ret;
}

void Device::setKeepScreenOn(bool value)
{
}

NS_CC_END

#endif // CC_TARGET_PLATFORM == CC_PLATFORM_LINUX