libg15render

text.c File Reference

#include "libg15render.h"

Go to the source code of this file.

Functions

int calc_ttf_centering (FT_Face face, char *str)
int calc_ttf_right_justify (FT_Face face, char *str)
int calc_ttf_totalstringwidth (FT_Face face, char *str)
int calc_ttf_true_ypos (FT_Face face, int y, int ttf_fontsize)
void draw_ttf_char (g15canvas *canvas, FT_Bitmap charbitmap, unsigned char character, int x, int y, int color)
void draw_ttf_str (g15canvas *canvas, char *str, int x, int y, int color, FT_Face face)
void g15r_renderCharacterLarge (g15canvas *canvas, int col, int row, unsigned char character, unsigned int sx, unsigned int sy)
 Renders a character in the large font at (x, y)
void g15r_renderCharacterMedium (g15canvas *canvas, int col, int row, unsigned char character, unsigned int sx, unsigned int sy)
 Renders a character in the meduim font at (x, y)
void g15r_renderCharacterSmall (g15canvas *canvas, int col, int row, unsigned char character, unsigned int sx, unsigned int sy)
 Renders a character in the small font at (x, y)
void g15r_renderString (g15canvas *canvas, unsigned char stringOut[], int row, int size, unsigned int sx, unsigned int sy)
 Renders a string with font size in row.
void g15r_ttfLoad (g15canvas *canvas, char *fontname, int fontsize, int face_num)
 Loads a font through the FreeType2 library.
void g15r_ttfPrint (g15canvas *canvas, int x, int y, int fontsize, int face_num, int color, int center, char *print_string)
 Prints a string in a given font.

Function Documentation

int calc_ttf_centering ( FT_Face  face,
char *  str 
)

Definition at line 209 of file text.c.

References calc_ttf_totalstringwidth().

Referenced by g15r_ttfPrint().

{
  int leftpos;

  leftpos = 80 - (calc_ttf_totalstringwidth (face, str) / 2);
  if (leftpos < 1)
    leftpos = 1;

  return leftpos;
}
int calc_ttf_right_justify ( FT_Face  face,
char *  str 
)

Definition at line 221 of file text.c.

References calc_ttf_totalstringwidth().

Referenced by g15r_ttfPrint().

{
  int leftpos;

  leftpos = 160 - calc_ttf_totalstringwidth (face, str);
  if (leftpos < 1)
    leftpos = 1;

  return leftpos;
}
int calc_ttf_totalstringwidth ( FT_Face  face,
char *  str 
)

Definition at line 191 of file text.c.

Referenced by calc_ttf_centering(), and calc_ttf_right_justify().

{
  FT_GlyphSlot slot = face->glyph;
  FT_UInt glyph_index;
  int i, errcode;
  unsigned int len = strlen (str);
  int width = 0;

  for (i = 0; i < len; i++)
    {
      glyph_index = FT_Get_Char_Index (face, str[i]);
      errcode = FT_Load_Glyph (face, glyph_index, 0);
      width += slot->advance.x >> 6;
    }
  return width;
}
int calc_ttf_true_ypos ( FT_Face  face,
int  y,
int  ttf_fontsize 
)

Definition at line 179 of file text.c.

Referenced by g15r_ttfPrint().

{

  if (!FT_IS_SCALABLE (face))
    ttf_fontsize = face->available_sizes->height;

  y += ttf_fontsize * .75;

  return y;
}
void draw_ttf_char ( g15canvas canvas,
FT_Bitmap  charbitmap,
unsigned char  character,
int  x,
int  y,
int  color 
)

Definition at line 233 of file text.c.

References g15canvas::ftLib, and g15r_setPixel().

Referenced by draw_ttf_str().

{
  FT_Int char_x, char_y, p, q;
  FT_Int x_max = x + charbitmap.width;
  FT_Int y_max = y + charbitmap.rows;
  static FT_Bitmap tmpbuffer;

  /* convert to 8bit format.. */
  FT_Bitmap_Convert (canvas->ftLib, &charbitmap, &tmpbuffer, 1);

  for (char_y = y, q = 0; char_y < y_max; char_y++, q++)
      for (char_x = x, p = 0; char_x < x_max; char_x++, p++)
          if (tmpbuffer.buffer[q * tmpbuffer.width + p])
            g15r_setPixel (canvas, char_x, char_y, color);
}
void draw_ttf_str ( g15canvas canvas,
char *  str,
int  x,
int  y,
int  color,
FT_Face  face 
)

Definition at line 251 of file text.c.

References draw_ttf_char().

Referenced by g15r_ttfPrint().

{
  FT_GlyphSlot slot = face->glyph;
  int i, errcode;
  unsigned int len = strlen (str);

  for (i = 0; i < len; i++)
    {
      errcode =
        FT_Load_Char (face, str[i],
                      FT_LOAD_RENDER | FT_LOAD_MONOCHROME |
                      FT_LOAD_TARGET_MONO);
      draw_ttf_char (canvas, slot->bitmap, str[i], x + slot->bitmap_left,
                     y - slot->bitmap_top, color);
      x += slot->advance.x >> 6;
    }
}
void g15r_renderCharacterLarge ( g15canvas canvas,
int  col,
int  row,
unsigned char  character,
unsigned int  sx,
unsigned int  sy 
)

Renders a character in the large font at (x, y)

Definition at line 22 of file text.c.

References fontdata_8x8, G15_COLOR_BLACK, G15_COLOR_WHITE, and g15r_setPixel().

Referenced by g15r_renderString().

{
  int helper = character * 8;   /* for our font which is 8x8 */

  int top_left_pixel_x = sx + col * (8);        /* 1 pixel spacing */
  int top_left_pixel_y = sy + row * (8);        /* once again 1 pixel spacing */

  int x, y;
  for (y = 0; y < 8; ++y)
    {
      for (x = 0; x < 8; ++x)
        {
          char font_entry = fontdata_8x8[helper + y];

          if (font_entry & 1 << (7 - x))
            g15r_setPixel (canvas, top_left_pixel_x + x, top_left_pixel_y + y,
                           G15_COLOR_BLACK);
          else
            g15r_setPixel (canvas, top_left_pixel_x + x, top_left_pixel_y + y,
                           G15_COLOR_WHITE);

        }
    }
}
void g15r_renderCharacterMedium ( g15canvas canvas,
int  col,
int  row,
unsigned char  character,
unsigned int  sx,
unsigned int  sy 
)

Renders a character in the meduim font at (x, y)

Definition at line 50 of file text.c.

References fontdata_7x5, G15_COLOR_BLACK, G15_COLOR_WHITE, and g15r_setPixel().

Referenced by g15r_renderString().

{
  int helper = character * 7 * 5;       /* for our font which is 6x4 */

  int top_left_pixel_x = sx + col * (5);        /* 1 pixel spacing */
  int top_left_pixel_y = sy + row * (7);        /* once again 1 pixel spacing */

  int x, y;
  for (y = 0; y < 7; ++y)
    {
      for (x = 0; x < 5; ++x)
        {
          char font_entry = fontdata_7x5[helper + y * 5 + x];
          if (font_entry)
            g15r_setPixel (canvas, top_left_pixel_x + x, top_left_pixel_y + y,
                           G15_COLOR_BLACK);
          else
            g15r_setPixel (canvas, top_left_pixel_x + x, top_left_pixel_y + y,
                           G15_COLOR_WHITE);

        }
    }
}
void g15r_renderCharacterSmall ( g15canvas canvas,
int  col,
int  row,
unsigned char  character,
unsigned int  sx,
unsigned int  sy 
)

Renders a character in the small font at (x, y)

Definition at line 77 of file text.c.

References fontdata_6x4, G15_COLOR_BLACK, G15_COLOR_WHITE, and g15r_setPixel().

Referenced by g15r_renderString().

{
  int helper = character * 6 * 4;       /* for our font which is 6x4 */

  int top_left_pixel_x = sx + col * (4);        /* 1 pixel spacing */
  int top_left_pixel_y = sy + row * (6);        /* once again 1 pixel spacing */

  int x, y;
  for (y = 0; y < 6; ++y)
    {
      for (x = 0; x < 4; ++x)
        {
          char font_entry = fontdata_6x4[helper + y * 4 + x];
          if (font_entry)
            g15r_setPixel (canvas, top_left_pixel_x + x, top_left_pixel_y + y,
                           G15_COLOR_BLACK);
          else
            g15r_setPixel (canvas, top_left_pixel_x + x, top_left_pixel_y + y,
                           G15_COLOR_WHITE);

        }
    }
}
void g15r_renderString ( g15canvas canvas,
unsigned char  stringOut[],
int  row,
int  size,
unsigned int  sx,
unsigned int  sy 
)

Renders a string with font size in row.

Definition at line 104 of file text.c.

References G15_TEXT_LARGE, G15_TEXT_MED, G15_TEXT_SMALL, g15r_renderCharacterLarge(), g15r_renderCharacterMedium(), and g15r_renderCharacterSmall().

{

  int i = 0;
  for (i; stringOut[i] != NULL; ++i)
    {
      switch (size)
        {
        case G15_TEXT_SMALL:
          {
            g15r_renderCharacterSmall (canvas, i, row, stringOut[i], sx, sy);
            break;
          }
        case G15_TEXT_MED:
          {
            g15r_renderCharacterMedium (canvas, i, row, stringOut[i], sx, sy);
            break;
          }
        case G15_TEXT_LARGE:
          {
            g15r_renderCharacterLarge (canvas, i, row, stringOut[i], sx, sy);
            break;
          }
        default:
          break;
        }
    }

}
void g15r_ttfLoad ( g15canvas canvas,
char *  fontname,
int  fontsize,
int  face_num 
)

Loads a font through the FreeType2 library.

Load a font for use with FreeType2 font support

Parameters:
canvasA pointer to a g15canvas struct in which the buffer to be operated on is found.
fontnameAbsolute pathname to font file to be loaded.
fontsizeSize in points for font to be loaded.
face_numSlot into which font face will be loaded.

Definition at line 145 of file text.c.

References g15canvas::ftLib, G15_MAX_FACE, g15canvas::ttf_face, and g15canvas::ttf_fontsize.

{
  int errcode = 0;

  if (face_num < 0)
    face_num = 0;
  if (face_num > G15_MAX_FACE)
    face_num = G15_MAX_FACE;

  if (canvas->ttf_fontsize[face_num])
    FT_Done_Face (canvas->ttf_face[face_num][0]);       /* destroy the last face */

  if (!canvas->ttf_fontsize[face_num] && !fontsize)
    canvas->ttf_fontsize[face_num] = 10;
  else
    canvas->ttf_fontsize[face_num] = fontsize;

  errcode =
    FT_New_Face (canvas->ftLib, fontname, 0, &canvas->ttf_face[face_num][0]);
  if (errcode)
    {
      canvas->ttf_fontsize[face_num] = 0;
    }
  else
    {
      if (canvas->ttf_fontsize[face_num]
          && FT_IS_SCALABLE (canvas->ttf_face[face_num][0]))
        errcode =
          FT_Set_Char_Size (canvas->ttf_face[face_num][0], 0,
                            canvas->ttf_fontsize[face_num] * 64, 90, 0);
    }
}
void g15r_ttfPrint ( g15canvas canvas,
int  x,
int  y,
int  fontsize,
int  face_num,
int  color,
int  center,
char *  print_string 
)

Prints a string in a given font.

Render a string with a FreeType2 font

Parameters:
canvasA pointer to a g15canvas struct in which the buffer to be operated on is found.
xinitial x position for string.
yinitial y position for string.
fontsizeSize of string in points.
face_numFont to be used is loaded in this slot.
colorText will be drawn this color.
centerText will be centered if center == 1 and right justified if center == 2.
print_stringPointer to the string to be printed.

Definition at line 283 of file text.c.

References calc_ttf_centering(), calc_ttf_right_justify(), calc_ttf_true_ypos(), draw_ttf_str(), g15canvas::ttf_face, and g15canvas::ttf_fontsize.

{
  int errcode = 0;

  if (canvas->ttf_fontsize[face_num])
    {
      if (fontsize > 0 && FT_IS_SCALABLE (canvas->ttf_face[face_num][0]))
        {
          canvas->ttf_fontsize[face_num] = fontsize;
          int errcode =
            FT_Set_Pixel_Sizes (canvas->ttf_face[face_num][0], 0,
                                canvas->ttf_fontsize[face_num]);
          if (errcode)
            printf ("Trouble setting the Glyph size!\n");
        }
      y =
        calc_ttf_true_ypos (canvas->ttf_face[face_num][0], y,
                            canvas->ttf_fontsize[face_num]);
      if (center == 1)
        x = calc_ttf_centering (canvas->ttf_face[face_num][0], print_string);
      else if (center == 2)
        x = calc_ttf_right_justify (canvas->ttf_face[face_num][0], print_string);
      draw_ttf_str (canvas, print_string, x, y, color,
                    canvas->ttf_face[face_num][0]);
    }
}