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|
/****************************************************************************/
/* */
/* The FreeType project -- a free and portable quality TrueType renderer. */
/* */
/* Copyright 1996-2001 by */
/* D. Turner, R.Wilhelm, and W. Lemberg */
/* */
/* ftstring: Making string text from individual glyph information. */
/* */
/* Keys: */
/* */
/* + : fast scale up */
/* - : fast scale down */
/* u : fine scale down */
/* j : fine scale up */
/* */
/* h : toggle hinting */
/* */
/* ESC : exit */
/* */
/* */
/* NOTE: This is just a test program that is used to show off and */
/* debug the current engine. */
/* */
/****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "common.h"
#include "display.h"
#include "freetype.h"
#include "gevents.h"
#include "gdriver.h"
#include "gmain.h"
#define Pi 3.1415926535
#define MAXPTSIZE 500 /* dtp */
#define Center_X ( Bit.width / 2 ) /* dtp */
#define Center_Y ( Bit.rows / 2 ) /* dtp */
TT_Engine engine;
TT_Face face;
TT_Instance instance;
TT_Glyph glyph;
TT_CharMap char_map;
TT_Glyph_Metrics metrics;
TT_Face_Properties properties;
TT_Instance_Metrics imetrics;
int num_glyphs;
int ptsize;
int hinted;
char Header[128];
int Fail;
int Num;
int gray_render;
short glyph_code[128];
int num_codes;
/* Convert an ASCII string to a string of glyph indexes. */
/* */
/* IMPORTANT NOTE: */
/* */
/* There is no portable way to convert from any system's char. code */
/* to Unicode. This function simply takes a char. string as argument */
/* and "interprets" each character as a Unicode char. index with no */
/* further check. */
/* */
/* This mapping is only valid for the ASCII character set (i.e., */
/* codes 32 to 127); all other codes (like accentuated characters) */
/* will produce more or less random results, depending on the system */
/* being run. */
static void CharToUnicode( char* source )
{
unsigned short i, n;
unsigned short platform, encoding;
/* First, look for a Unicode charmap */
n = properties.num_CharMaps;
for ( i = 0; i < n; i++ )
{
TT_Get_CharMap_ID( face, i, &platform, &encoding );
if ( (platform == 3 && encoding == 1 ) ||
(platform == 0 && encoding == 0 ) )
{
TT_Get_CharMap( face, i, &char_map );
i = n + 1;
}
}
if ( i == n )
Panic( "Sorry, but this font doesn't contain any Unicode mapping table\n" );
for ( n = 0; n < 128 && source[n]; n++ )
#if 1
glyph_code[n] = TT_Char_Index( char_map, (short)source[n] );
#else
/* Note, if you have a function, say ToUnicode(), to convert from */
/* char codes to Unicode, use the following line instead: */
glyph_code[n] = TT_Char_Index( char_map, ToUnicode( source[n] ) );
#endif
num_codes = n;
}
static TT_Error Reset_Scale( int pointSize )
{
TT_Error error;
if ( (error = TT_Set_Instance_PointSize( instance, pointSize )) )
{
RestoreScreen();
fprintf( stderr, "Error = 0x%x.\n", (unsigned)error );
Panic( "Could not reset instance.\n" );
}
TT_Get_Instance_Metrics( instance, &imetrics );
/* now re-allocates the small bitmap */
if ( gray_render )
{
Init_Small( imetrics.x_ppem, imetrics.y_ppem );
Clear_Small();
}
return TT_Err_Ok;
}
static TT_Error LoadTrueTypeChar( int idx, int hint )
{
int flags;
flags = TTLOAD_SCALE_GLYPH;
if ( hint )
flags |= TTLOAD_HINT_GLYPH;
return TT_Load_Glyph( instance, glyph, idx, flags );
}
static TT_Error Render_All( void )
{
TT_F26Dot6 x, y, z, minx, miny, maxx, maxy;
int i;
TT_Error error;
/* On the first pass, we compute the compound bounding box */
x = y = 0;
minx = miny = maxx = maxy = 0;
for ( i = 0; i < num_codes; i++ )
{
if ( !(error = LoadTrueTypeChar( glyph_code[i], hinted )) )
{
TT_Get_Glyph_Metrics( glyph, &metrics );
z = x + metrics.bbox.xMin;
if ( minx > z )
minx = z;
z = x + metrics.bbox.xMax;
if ( maxx < z )
maxx = z;
z = y + metrics.bbox.yMin;
if ( miny > z )
miny = z;
z = y + metrics.bbox.yMax;
if ( maxy < z )
maxy = z;
x += metrics.advance & -64;
}
else
Fail++;
}
/* We now center the bbox inside the target bitmap */
minx = ( minx & -64 ) >> 6;
miny = ( miny & -64 ) >> 6;
maxx = ( (maxx+63) & -64 ) >> 6;
maxy = ( (maxy+63) & -64 ) >> 6;
maxx -= minx;
maxy -= miny;
minx = (Bit.width - maxx)/2;
miny = (Bit.rows + miny)/2;
maxx += minx;
maxy += maxy;
/* On the second pass, we render each glyph to its centered position. */
/* This is slow, because we reload each glyph to render it! */
x = minx;
y = miny;
for ( i = 0; i < num_codes; i++ )
{
if ( !(error = LoadTrueTypeChar( glyph_code[i], hinted )) )
{
TT_Get_Glyph_Metrics( glyph, &metrics );
Render_Single_Glyph( gray_render, glyph, (int)x, (int)y );
x += metrics.advance/64;
}
}
return TT_Err_Ok;
}
static int Process_Event( TEvent* event )
{
switch ( event->what )
{
case event_Quit: /* ESC or q */
return 0;
case event_Keyboard:
if ( event->info == 'h' ) /* Toggle hinting */
hinted = !hinted;
break;
case event_Rotate_Glyph:
break;
case event_Scale_Glyph:
ptsize += event->info;
if ( ptsize < 1 ) ptsize = 1;
if ( ptsize > MAXPTSIZE ) ptsize = MAXPTSIZE;
break;
case event_Change_Glyph:
break;
}
return 1;
}
static void usage( char* execname )
{
fprintf( stderr,
"\n"
"ftstring: simple String Test Display -- part of the FreeType project\n"
"--------------------------------------------------------------------\n"
"\n"
"Usage: %s [options below] ppem fontname[.ttf|.ttc] [string]\n",
execname );
fprintf( stderr,
"\n"
" -g gray-level rendering (default: none)\n"
" -r R use resolution R dpi (default: 96)\n"
"\n" );
exit( EXIT_FAILURE );
}
int main( int argc, char** argv )
{
int i, old_ptsize, orig_ptsize, file;
int XisSetup = 0;
char filename[128 + 4];
char alt_filename[128 + 4];
char* execname;
int option;
int res = 96;
TT_Error error;
TEvent event;
execname = ft_basename( argv[0] );
while ( 1 )
{
option = ft_getopt( argc, argv, "gr:" );
if ( option == -1 )
break;
switch ( option )
{
case 'g':
gray_render = 1;
break;
case 'r':
res = atoi( ft_optarg );
if ( res < 1 )
usage( execname );
break;
default:
usage( execname );
break;
}
}
argc -= ft_optind;
argv += ft_optind;
if ( argc <= 1 )
usage( execname );
if ( sscanf( argv[0], "%d", &orig_ptsize ) != 1 )
orig_ptsize = 64;
file = 1;
/* Initialize engine */
if ( (error = TT_Init_FreeType( &engine )) )
Panic( "Error while initializing engine, code = 0x%x.\n", error );
ptsize = orig_ptsize;
hinted = 1;
i = strlen( argv[file] );
while ( i > 0 && argv[file][i] != '\\' && argv[file][i] != '/' )
{
if ( argv[file][i] == '.' )
i = 0;
i--;
}
filename[128] = '\0';
alt_filename[128] = '\0';
strncpy( filename, argv[file], 128 );
strncpy( alt_filename, argv[file], 128 );
if ( i >= 0 )
{
strncpy( filename + strlen( filename ), ".ttf", 4 );
strncpy( alt_filename + strlen( alt_filename ), ".ttc", 4 );
}
/* Load face */
error = TT_Open_Face( engine, filename, &face );
if ( error == TT_Err_Could_Not_Open_File )
{
strcpy( filename, alt_filename );
error = TT_Open_Face( engine, alt_filename, &face );
}
if ( error == TT_Err_Could_Not_Open_File )
Panic( "Could not find/open %s.\n", filename );
else if (error)
Panic( "Error while opening %s, error code = 0x%x.\n",
filename, error );
/* get face properties and allocate preload arrays */
TT_Get_Face_Properties( face, &properties );
num_glyphs = properties.num_Glyphs;
/* create glyph */
error = TT_New_Glyph( face, &glyph );
if ( error )
Panic( "Could not create glyph container.\n" );
/* create instance */
error = TT_New_Instance( face, &instance );
if ( error )
Panic( "Could not create instance for %s.\n", filename );
error = TT_Set_Instance_Resolutions( instance, res, res );
if ( error )
Panic( "Could not set device resolutions." );
if ( !XisSetup )
{
XisSetup = 1;
if ( gray_render )
{
if ( !SetGraphScreen( Graphics_Mode_Gray ) )
Panic( "Could not set up grayscale graphics mode.\n" );
TT_Set_Raster_Gray_Palette( engine, virtual_palette );
}
else
{
if ( !SetGraphScreen( Graphics_Mode_Mono ) )
Panic( "Could not set up mono graphics mode.\n" );
}
}
Init_Display( gray_render );
Reset_Scale( ptsize );
old_ptsize = ptsize;
Fail = 0;
Num = 0;
CharToUnicode( ( argv[2] ? argv[2] :
"The quick brown fox jumps over the lazy dog" ) );
for ( ;; )
{
Clear_Display();
Render_All();
if ( gray_render )
Convert_To_Display_Palette();
sprintf( Header, "%s: ptsize: %4d hinting: %s",
ft_basename( filename ), ptsize,
hinted ? "on" : "off" );
Display_Bitmap_On_Screen( Bit.bitmap, Bit.rows, Bit.cols );
#ifndef X11
#ifndef OS2
Print_XY( 0, 0, Header );
#endif
#endif
Get_Event( &event );
if ( !( Process_Event( &event ) ) )
goto End;
if ( ptsize != old_ptsize )
{
if ( Reset_Scale( ptsize ) )
Panic( "Could not resize font.\n" );
old_ptsize = ptsize;
}
}
End:
RestoreScreen();
TT_Close_Face( face );
TT_Done_FreeType( engine );
printf( "Execution completed successfully.\n" );
printf( "Fails = %d.\n", Fail );
exit( EXIT_SUCCESS ); /* for safety reasons */
return 0; /* never reached */
}
/* End */
|