freetype2字体的处理问题

[didijiji]

这个链接：
http://blog.chinaunix.net/uid-22670933-id-1771615.html

其中的这段代码看不懂，麻烦解释一下：

 for (; j < face->glyph->bitmap.rows + (font_size * 26) / 32 - face->glyph->bitmap_top; j++)
    {
        for (i = 1; i <= face->glyph->bitmap_left; i++)
        {
            printf("_");
        }

        for (k = 0; k < face->glyph->bitmap.pitch; k++)
        {
            temp = face->glyph->bitmap.buffer[face->glyph->bitmap.pitch*(j + face->glyph->bitmap_top - (font_size * 26) / 32) + k];
            for (counter = 0; counter < 8; counter++)
            {
 if (temp & 0x80)
                {
                    printf("*");
                }
                else
                {
                    printf("_");
                }
                temp <<= 1;
                i++;
                if (i > font_size)
                {
                    break;
                }
            }
        }

        for (; i <= font_size; i++)
        {
        // printf("|");

        }
        printf("\n");
    }

还有face->glyph->bitmap.pitch为什么是6，用printf（）打印出来是6。