cfont.cpp

#include "globals.h"

#include "cfont.h"
#include "cvideo.h"
#include "cgame.h"

#include <stdlib.h>
#include <assert.h>
#include <string.h>

/* Constructs a new font object.  Loads a tiled font file from the given bitmap image
   file, using the given character width and height (the font is monospaced).  The
   characters-per-line are used when extracting a character from the tiled bitmap file
   and corresponds to the number of characters per "line of characters" there are
   in the bitmap file. */
CFont::CFont(const char *bmp_filename, int char_width, int char_height, int bitmap_chars_per_line)
{
        this->bitmap_chars_per_line = bitmap_chars_per_line;
        this->char_height = char_height;
        this->char_width = char_width;

  CSurface bmp_image(bmp_filename);
  bitmap = bmp_image;
  bitmap.set_transparent_color(CColor(1));
}

/* Draws the given string in the given font, centered at the specified (x,y) coordinates. */
void CFont::draw_string_centered(CSurface *surface, CPoint point, const char *string)
{
        point.x -= ( ((int) strlen(string) * char_width) / 2);
        point.y -= (char_height / 2);

        draw_string(surface, point, string);
}

/* Draws the given string with a black rectangle behind it and then updates the
   game's rectangle list for redrawing. */
void CFont::draw_string_opaque(CSurface *surface, CPoint point, const char *string)
{
  CRect r;

  /* Draw a black rectangle behind where the string is going to be drawn */
  r.pos = point;
  r.size.x = (char_width*(int)strlen(string));
  r.size.y = char_height;

  surface->fill_rect(r, 0);

  /* Draw the string */
  draw_string(surface, point, string);
}

/* Draws the given string in the given font, so that the upper-left corner of the string
   is at the given (x,y) pixel coordinates. */
void CFont::draw_string(CSurface *surface, CPoint point, const char *string)
{
        int i;
        int string_length;

  CRect r_src;

        r_src.size.x = char_width;
        r_src.size.y = char_height;

        string_length = (int) strlen(string);

        for (i = 0; i < string_length; i++) {
                int char_code, char_x, char_y;

                char_code = string[i] - CHAR_CODE_OFFSET;

    char_x = char_code % bitmap_chars_per_line;
                char_y = char_code / bitmap_chars_per_line;

                r_src.pos.x = char_x * char_width;
                r_src.pos.y = char_y * char_height;

    surface->blit(bitmap, point, r_src);
                point.x += char_width;
  }
}

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