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) More...
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) More...
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) More...
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. More...
void	g15r_ttfLoad (g15canvas *canvas, char *fontname, int fontsize, int face_num)
	Loads a font through the FreeType2 library. More...
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. More...

Function Documentation

calc_ttf_centering()

int calc_ttf_centering	(	FT_Face	face,
		char *	str
	)

Definition at line 209 of file text.c.

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

References calc_ttf_totalstringwidth().

Referenced by g15r_ttfPrint().

calc_ttf_right_justify()

int calc_ttf_right_justify	(	FT_Face	face,
		char *	str
	)

Definition at line 221 of file text.c.

{
  int leftpos;
 
  leftpos = 160 - calc_ttf_totalstringwidth (face, str);
  if (leftpos < 1)
    leftpos = 1;
 
  return leftpos;
}

References calc_ttf_totalstringwidth().

Referenced by g15r_ttfPrint().

calc_ttf_totalstringwidth()

int calc_ttf_totalstringwidth	(	FT_Face	face,
		char *	str
	)

Definition at line 191 of file text.c.

{
  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;
}

Referenced by calc_ttf_centering(), and calc_ttf_right_justify().

calc_ttf_true_ypos()

int calc_ttf_true_ypos	(	FT_Face	face,
		int	y,
		int	ttf_fontsize
	)

Definition at line 179 of file text.c.

{
 
  if (!FT_IS_SCALABLE (face))
    ttf_fontsize = face->available_sizes->height;
 
  y += ttf_fontsize * .75;
 
  return y;
}

Referenced by g15r_ttfPrint().

draw_ttf_char()

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.

{
  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);
}

References g15canvas::ftLib, and g15r_setPixel().

Referenced by draw_ttf_str().

draw_ttf_str()

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.

{
  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;
    }
}

References draw_ttf_char().

Referenced by g15r_ttfPrint().

g15r_renderCharacterLarge()

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.

{
  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);
 
        }
    }
}

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

Referenced by g15r_renderString().

g15r_renderCharacterMedium()

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.

{
  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);
 
        }
    }
}

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

Referenced by g15r_renderString().

g15r_renderCharacterSmall()

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.

{
  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);
 
        }
    }
}

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

Referenced by g15r_renderString().

g15r_renderString()

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.

{
 
  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;
        }
    }
 
}

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

g15r_ttfLoad()

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

canvas	A pointer to a g15canvas struct in which the buffer to be operated on is found.
fontname	Absolute pathname to font file to be loaded.
fontsize	Size in points for font to be loaded.
face_num	Slot into which font face will be loaded.

Definition at line 145 of file text.c.

{
  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);
    }
}

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

g15r_ttfPrint()

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

canvas	A pointer to a g15canvas struct in which the buffer to be operated on is found.
x	initial x position for string.
y	initial y position for string.
fontsize	Size of string in points.
face_num	Font to be used is loaded in this slot.
color	Text will be drawn this color.
center	Text will be centered if center == 1 and right justified if center == 2.
print_string	Pointer to the string to be printed.

Definition at line 283 of file text.c.

{
  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]);
    }
}

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