TextManager.cpp

// Mandexing: a manual indexing program for crystallographic data.
// Copyright (C) 2017-2018 Helen Ginn
// 
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
// 
// Please email: vagabond @ hginn.co.uk for more details.

#include "TextManager.h"
#include "font.h"
#include <cstdlib>

void TextManager::text_free(png_byte **pointer)
{
    free(*pointer);
}

void TextManager::text_malloc(png_byte **pointer, std::string text, int *width, int *height)
{
	if (!text.length())
	{
		return;
	}
	
    int squish = 3;
    int totalWidth = squish;
    int maxHeight = 0;
    
    for (size_t i = 0; i < text.length(); i++)
    {
	int pos = text[i];
        int charHeight = asciiDimensions[pos][0];
        int charWidth = asciiDimensions[pos][1];
        totalWidth += charWidth - squish;
        if (charHeight > maxHeight)
        {
            maxHeight = charHeight;
        }
    }
    
    totalWidth += squish;
    
    *width = totalWidth;
    *height = maxHeight;
    
    *pointer = (png_byte *)calloc(maxHeight * totalWidth, sizeof(png_byte));
    
    int currentX = 0;
    
    for (size_t i = 0; i < text.length(); i++)
    {
        int whichAscii = text[i];
        png_byte *chosenAscii = asciis[whichAscii];
        int chosenHeight = asciiDimensions[whichAscii][0];
        int chosenWidth = asciiDimensions[whichAscii][1];
        
        for (int k = 0; k < chosenHeight; k++)
        {
            for (int j = 0; j < chosenWidth; j++)
            {
                int xPos = currentX + j;
                int newPos = totalWidth * k + xPos;
                int asciiPos = chosenWidth * k + j;
                
                (*pointer)[newPos] += chosenAscii[asciiPos];
            }
        }
        
        currentX += chosenWidth - squish;
    }
}