imagefont.cpp

/*      _______   __   __   __   ______   __   __   _______   __   __                 
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 *
 * Copyright (c) 2004, 2005 darkbits                        Js_./
 * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
 * Olof Naessén a.k.a jansem/yakslem                _asww7!uY`>  )\a//
 *                                                 _Qhm`] _f "'c  1!5m
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/*
 * For comments regarding functions please see the header file. 
 */

#include "guichan/imagefont.hpp"

#include <sstream>

#include "guichan/color.hpp"
#include "guichan/exception.hpp"
#include "guichan/graphics.hpp"
#include "guichan/image.hpp"

namespace gcn
{
    ImageFont::ImageFont(const std::string& filename, const std::string& glyphs)
    {
        mFilename = filename;
        mImage = Image::load(filename, false);
 
        Color separator = mImage->getPixel(0, 0);

        int i = 0;
        for (i=0; separator == mImage->getPixel(i, 0)
                 && i < mImage->getWidth(); ++i)
        {         
        }
        
        if (i >= mImage->getWidth())
        {
            throw GCN_EXCEPTION("Corrupt image.");
        }
        
        int j = 0;
        for (j = 0; j < mImage->getHeight(); ++j)
        {
            if (separator == mImage->getPixel(i, j))
            {
                break;
            }
        }                       

        mHeight = j;
        int x = 0, y = 0;
        unsigned char k;

        for (i=0; i < (int)glyphs.size(); ++i) 
        {
            k = glyphs.at(i);
            addGlyph(k, x, y, separator);
        }
    
        int w = mImage->getWidth();
        int h = mImage->getHeight();
        mImage->convertToDisplayFormat();
    
        mRowSpacing = 0;
        mGlyphSpacing = 0;        
    }

    ImageFont::ImageFont(const std::string& filename, unsigned char glyphsFrom, unsigned char glyphsTo)
    {
        mFilename = filename;                
        mImage = Image::load(filename, false);
        
        Color separator = mImage->getPixel(0, 0);

        int i = 0;
        for (i=0; separator == mImage->getPixel(i, 0)
                 && i < mImage->getWidth(); ++i)
        {         
        }
        
        if (i >= mImage->getWidth())
        {
            throw GCN_EXCEPTION("Corrupt image.");
        }
        
        int j = 0;
        for (j = 0; j < mImage->getHeight(); ++j)
        {
            if (separator == mImage->getPixel(i, j))
            {
                break;
            }
        }                       

        mHeight = j;
        int x = 0, y = 0;
        unsigned char k;
        
        for (i=glyphsFrom; i<glyphsTo+1; i++)
        {
            addGlyph(i, x, y, separator); 
        }

        int w = mImage->getWidth();
        int h = mImage->getHeight();
        mImage->convertToDisplayFormat();
        
        mRowSpacing = 0;
        mGlyphSpacing = 0;        
    }

    ImageFont::~ImageFont()
    {
        delete mImage;        
    }
  
    int ImageFont::getWidth(unsigned char glyph) const
    {
        if (mGlyph[glyph].width == 0)
        {         
            return mGlyph[(int)(' ')].width + mGlyphSpacing;
        }
    
        return mGlyph[glyph].width + mGlyphSpacing;
    }

    int ImageFont::getHeight() const
    {
        return mHeight + mRowSpacing;
    }

    int ImageFont::drawGlyph(Graphics* graphics, unsigned char glyph, int x, int y)
    {
        // This is needed for drawing the Glyph in the middle if we have spacing
        int yoffset = getRowSpacing() >> 1;
        
        if (mGlyph[glyph].width == 0)
        {
            graphics->drawRectangle(Rectangle(x, y + 1 + yoffset, mGlyph[(int)(' ')].width - 1,
                                              mGlyph[(int)(' ')].height - 2));
      
            return mGlyph[(int)(' ')].width + mGlyphSpacing;
        }
    
        graphics->drawImage(mImage, mGlyph[glyph].x, mGlyph[glyph].y, x,
                            y + yoffset, mGlyph[glyph].width, mGlyph[glyph].height);
        
        return mGlyph[glyph].width + mGlyphSpacing;
    }

    void ImageFont::drawString(Graphics* graphics, const std::string& text, int x, int y)
    {
        unsigned int i;
    
        for (i = 0; i< text.size(); ++i)
        {
            drawGlyph(graphics, text.at(i), x, y);
            x += getWidth(text.at(i));      
        }    
    }

    void ImageFont::setRowSpacing(int spacing)
    {
        mRowSpacing = spacing;
    }

    int ImageFont::getRowSpacing()
    {
        return mRowSpacing;
    }
    
    void ImageFont::setGlyphSpacing(int spacing)
    {
        mGlyphSpacing = spacing;
    }
    
    int ImageFont::getGlyphSpacing()
    {
        return mGlyphSpacing;
    }

    void ImageFont::addGlyph(unsigned char c, int &x,
                             int &y, const Color& separator)
    {
        Color color;
        do
        {
            ++x;

            if (x >= mImage->getWidth())
            {
                y += mHeight + 1;
                x = 0;

                if (y >= mImage->getHeight())
                {
                    std::string str;
                    std::ostringstream os(str);
                    os << "Image ";
                    os << mFilename;
                    os << " with font is corrupt near character '";
                    os << c;
                    os << "'";
                    throw GCN_EXCEPTION(os.str());
                }
            }            

            color = mImage->getPixel(x, y);

        } while (color == separator);
        
        int w = 0;
        
        do
        {
            ++w;

            if (x+w >= mImage->getWidth())
            {
                std::string str;
                std::ostringstream os(str);
                os << "Image ";
                os << mFilename;
                os << " with font is corrupt near character '";
                os << c;
                os << "'";
                throw GCN_EXCEPTION(os.str());
            }            
            
            color = mImage->getPixel(x + w, y);
            
        } while (color != separator);
        
        mGlyph[c] = Rectangle(x, y, w, mHeight);
        
        x += w;        
    }

    int ImageFont::getWidth(const std::string& text) const
    {
        unsigned int i;
        int size = 0;
    
        for (i = 0; i < text.size(); ++i)
        {
            size += getWidth(text.at(i));
        }
    
        return size;    
    }
    
    int ImageFont::getStringIndexAt(const std::string& text, int x)
    {
        unsigned int i;
        int size = 0;
    
        for (i = 0; i < text.size(); ++i)
        {
            size += getWidth(text.at(i));
      
            if (size > x)
            {
                return i;
            }
        }
    
        return text.size();    
    }
}

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