Initial commit

freetype.c

@@ -0,0 +1,156 @@
+/* example1.c                                                      */
+/*                                                                 */
+/* This small program shows how to print a rotated string with the */
+/* FreeType 2 library.                                             */
+
+
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+
+#include <ft2build.h>
+#include FT_FREETYPE_H
+
+
+#define WIDTH   640
+#define HEIGHT  480
+
+
+/* origin is the upper left corner */
+unsigned char image[HEIGHT][WIDTH];
+
+
+/* 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 simplicity, we assume that `bitmap->pixel_mode' */
+  /* is `FT_PIXEL_MODE_GRAY' (i.e., not a bitmap font)   */
+
+  for ( i = x, p = 0; i < x_max; i++, p++ )
+  {
+    for ( j = y, q = 0; j < y_max; j++, q++ )
+    {
+      if ( i < 0      || j < 0       ||
+           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++ )
+      putchar( image[i][j] == 0 ? ' '
+                                : image[i][j] < 128 ? '+'
+                                                    : '*' );
+    putchar( '\n' );
+  }
+}
+
+
+int
+main( int     argc,
+      char**  argv )
+{
+  FT_Library    library;
+  FT_Face       face;
+
+  FT_GlyphSlot  slot;
+  FT_Matrix     matrix;                 /* transformation matrix */
+  FT_Vector     pen;                    /* untransformed origin  */
+  FT_Error      error;
+
+  char*         filename;
+  char*         text;
+
+  double        angle;
+  int           target_height;
+  int           n, num_chars;
+
+
+  if ( argc != 3 )
+  {
+    fprintf ( stderr, "usage: %s font sample-text\n", argv[0] );
+    exit( 1 );
+  }
+
+  filename      = argv[1];                           /* first argument     */
+  text          = argv[2];                           /* second argument    */
+  num_chars     = strlen( text );
+  angle         = ( 25.0 / 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, 50 * 64, 0,
+                            100, 0 );                /* set character size */
+  /* error handling omitted */
+
+  /* cmap selection omitted;                                        */
+  /* for simplicity we assume that the font contains a Unicode cmap */
+
+  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 = 300 * 64;
+  pen.y = ( target_height - 200 ) * 64;
+
+  for ( n = 0; n < num_chars; n++ )
+  {
+    /* set transformation */
+    FT_Set_Transform( face, &matrix, &pen );
+
+    /* load glyph image into the slot (erase previous one) */
+    error = FT_Load_Char( face, text[n], FT_LOAD_RENDER );
+    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;
+}
+
+/* EOF */