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[ft-devel] MONOCHROME with hinting???


From: Peter M
Subject: [ft-devel] MONOCHROME with hinting???
Date: Thu, 23 Mar 2006 10:46:59 +0100

I am trying to make a monochrome sample.

 

0== white; 255== black

 

The results are bad and the image always gets grayscale values.

 

I can’t get a 1bit monochrome image. Can somebody help???

 

Also monochrome hinting help is welcome…

 

Regards

Peter M

 

 

 

 

CODE:

===============================================================================

#include <stdio.h>

#include <string.h>

#include <math.h>

 

 

#include <ft2build.h>

#include FT_FREETYPE_H

 

 

 

#define WIDTH   132

#define HEIGHT  128

 

 

/* origin is the upper left corner */

unsigned char image[HEIGHT][WIDTH];

char test;

 

 

/* Replace this function with something useful. */

 

void

draw_bitmap( FT_Bitmap*  bitmap,

             FT_Int      x,

             FT_Int      y)

{

  FT_Int  i, j, p, q;

  FT_Int  x_max = x + bitmap->width;

  FT_Int  y_max = y + bitmap->rows;

 

 

  for ( i = x, p = 0; i < x_max; i++, p++ )

  {

    for ( j = y, q = 0; j < y_max; j++, q++ )

    {

      if ( i >= WIDTH || j >= HEIGHT )

        continue;

 

      image[j][i] |= bitmap->buffer[q * bitmap->width + p];

    }

  }

}

 

 

void

show_image( void )

{

  int  i, j;

 

  for ( i = 0; i < HEIGHT; i++ )

  {

    for ( j = 0; j < WIDTH; j++ )

       {

             if(image[i][j] == 0)    test=' ';

             if(image[i][j] == 255)     test='*';

             putchar(test);

       }

       putchar( '\n' );

  }

}

 

int

main()

{

  FT_Library    library;

  FT_Face       face;

  FT_UInt           glyph_index;

  FT_GlyphSlot  slot;

  FT_Matrix     matrix;                 /* transformation matrix */

  FT_Vector     pen;                    /* untransformed origin  */

  FT_Error      error;

 

  char*         filename;

  unsigned int text[]= { 0x0054, 0x0065, 0x0073, 0x0074, 0x0020, 0x0050, 0x0052, 0x0049, 0x004E, 0x0054, 0x0021};// UNICODE HEX text codes "Test PRINT!"

  double        angle;

  int           target_height;

  int           n, num_chars;

 

 filename      = "arial.ttf";

 

  num_chars= sizeof(text)/sizeof(int);

  angle         = ( 0 / 360 ) * 3.14159 * 2;      /* use 25 degrees     */

  target_height = HEIGHT;

 

  error = FT_Init_FreeType( &library );              /* initialize library */

  /* error handling omitted */

 

  error = FT_New_Face( library, filename, 0, &face ); /* create face object */

  /* error handling omitted */

 

  /* use 50pt at 100dpi */

  error = FT_Set_Char_Size( face  ,

                                               14 *64 ,     

                                               0            , 

                          100         , 

                                               0            );                /* set character size */

 

   slot = face->glyph;

 

  /* set up matrix */

  matrix.xx = (FT_Fixed)( cos( angle ) * 0x10000L );

  matrix.xy = (FT_Fixed)(-sin( angle ) * 0x10000L );

  matrix.yx = (FT_Fixed)( sin( angle ) * 0x10000L );

  matrix.yy = (FT_Fixed)( cos( angle ) * 0x10000L );

 

  /* the pen position in 26.6 cartesian space coordinates; */

  /* start at (300,200) relative to the upper left corner  */

  pen.x = 1 * 64;

  pen.y = ( target_height- 10  ) * 64;

 

  for ( n = 0; n < num_chars; n++ )

  {

    /* set transformation */

    FT_Set_Transform( face, &matrix, &pen );

 

       glyph_index = FT_Get_Char_Index( face, text[n] );

 

       /* load glyph image into the slot (erase previous one) */

       error = FT_Load_Glyph( face, glyph_index,FT_LOAD_TARGET_MONO );

 

       /* convert to an anti-aliased bitmap */ 

       error = FT_Render_Glyph(face->glyph, FT_RENDER_MODE_MONO);

      

       if ( error )

      continue;                 /* ignore errors */

 

    /* now, draw to our target surface (convert position) */

    draw_bitmap( &slot->bitmap,

                 slot->bitmap_left,

                 target_height - slot->bitmap_top );

 

    /* increment pen position */

    pen.x += slot->advance.x;

    pen.y += slot->advance.y;

  }

 

  show_image();

 

  FT_Done_Face    ( face );

  FT_Done_FreeType( library );

 

  return 0;

}

 


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