ref: c6a92202c23b916536903921401e6289f8b66ca2
dir: /demos/src/ftview.c/
/****************************************************************************/
/* */
/* The FreeType project -- a free and portable quality TrueType renderer. */
/* */
/* Copyright 1996-2000 by */
/* D. Turner, R.Wilhelm, and W. Lemberg */
/* */
/* */
/* FTView - a simple font viewer. */
/* */
/* This is a new version using the MiGS graphics subsystem for */
/* blitting and display. */
/* */
/* Press F1 when running this program to have a list of key-bindings */
/* */
/****************************************************************************/
#include <freetype/freetype.h>
/* the following header shouldn't be used in normal programs */
#include <freetype/internal/ftdebug.h>
#include "common.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include "graph.h"
#include "grfont.h"
#define DIM_X 500
#define DIM_Y 400
#define CENTER_X ( bit.width / 2 )
#define CENTER_Y ( bit.rows / 2 )
#define MAXPTSIZE 500 /* dtp */
char Header[128];
char* new_header = 0;
const unsigned char* Text = (unsigned char*)
"The quick brown fox jumped over the lazy dog 0123456789 "
"\342\352\356\373\364\344\353\357\366\374\377\340\371\351\350\347 "
"&#~\"\'(-`_^@)=+\260 ABCDEFGHIJKLMNOPQRSTUVWXYZ "
"$\243^\250*\265\371%!\247:/;.,?<>";
FT_Library library; /* the FreeType library */
FT_Face face; /* the font face */
FT_Size size; /* the font size */
FT_GlyphSlot glyph; /* the glyph slot */
FT_Error error; /* error code returned by FreeType */
grSurface* surface; /* current display surface */
grBitmap bit; /* current display bitmap */
int num_glyphs; /* number of glyphs */
int ptsize; /* current point size */
int hinted = 1; /* is glyph hinting active? */
int antialias = 1; /* is anti-aliasing active? */
int use_sbits = 1; /* do we use embedded bitmaps? */
int low_prec = 0; /* force low precision */
int Num; /* current first glyph index */
int res = 72;
static grColor fore_color = { 255 };
int Fail;
int graph_init = 0;
int render_mode = 1;
int debug = 0;
int trace_level = 0;
#define RASTER_BUFF_SIZE 32768
char raster_buff[RASTER_BUFF_SIZE];
#define LOG( x ) LogMessage##x
static
void LogMessage( const char* fmt, ... )
{
va_list ap;
va_start( ap, fmt );
vfprintf( stderr, fmt, ap );
va_end( ap );
}
/* PanicZ */
static
void PanicZ( const char* message )
{
fprintf( stderr, "%s\n error = 0x%04x\n", message, error );
exit( 1 );
}
/* Clears the Bit bitmap/pixmap */
static
void Clear_Display( void )
{
long size = (long)bit.pitch * bit.rows;
if ( size < 0 )
size = -size;
memset( bit.buffer, 0, size );
}
/* Initialize the display bitmap `bit' */
static
void Init_Display( void )
{
grInitDevices();
bit.mode = gr_pixel_mode_gray;
bit.width = DIM_X;
bit.rows = DIM_Y;
bit.grays = 256;
surface = grNewSurface( 0, &bit );
if ( !surface )
PanicZ( "could not allocate display surface\n" );
graph_init = 1;
}
#define MAX_BUFFER 300000
#define FLOOR( x ) ( (x) & -64 )
#define CEIL( x ) ( ( (x) + 63 ) & -64 )
#define TRUNC( x ) ( (x) >> 6 )
/* Render a single glyph with the `grays' component */
static
FT_Error Render_Glyph( int x_offset,
int y_offset )
{
grBitmap bit3;
FT_Pos x_top, y_top;
/* first, render the glyph image into a bitmap */
if (glyph->format != ft_glyph_format_bitmap)
{
error = FT_Render_Glyph( glyph, antialias ? ft_render_mode_normal : ft_render_mode_mono );
if (error) return error;
}
/* now blit it to our display screen */
bit3.rows = glyph->bitmap.rows;
bit3.width = glyph->bitmap.width;
bit3.pitch = glyph->bitmap.pitch;
bit3.buffer = glyph->bitmap.buffer;
switch (glyph->bitmap.pixel_mode)
{
case ft_pixel_mode_mono:
bit3.mode = gr_pixel_mode_mono;
bit3.grays = 0;
break;
case ft_pixel_mode_grays:
bit3.mode = gr_pixel_mode_gray;
bit3.grays = glyph->bitmap.num_grays;
}
/* Then, blit the image to the target surface */
x_top = x_offset + glyph->bitmap_left;
y_top = y_offset - glyph->bitmap_top;
grBlitGlyphToBitmap( &bit, &bit3, x_top, y_top, fore_color );
return 0;
}
static
FT_Error Reset_Scale( int pointSize )
{
FT_Error error;
error = FT_Set_Char_Size( face, pointSize << 6,
pointSize << 6,
res,
res );
if ( error )
{
/* to be written */
}
return FT_Err_Ok;
}
static
FT_Error LoadChar( int idx,
int hint )
{
int flags;
flags = FT_LOAD_DEFAULT;
if ( !hint )
flags |= FT_LOAD_NO_HINTING;
if ( !use_sbits )
flags |= FT_LOAD_NO_BITMAP;
return FT_Load_Glyph( face, idx, flags );
}
static
FT_Error Render_All( int first_glyph,
int ptsize )
{
FT_F26Dot6 start_x, start_y, step_x, step_y, x, y;
int i;
FT_Error error;
start_x = 4;
start_y = 16 + ptsize ;
step_x = size->metrics.x_ppem + 4;
step_y = size->metrics.y_ppem + 10;
x = start_x;
y = start_y;
i = first_glyph;
#if 0
while ( i < first_glyph + 1 )
#else
while ( i < num_glyphs )
#endif
{
if ( !( error = LoadChar( i, hinted ) ) )
{
if ( debug && trace_level > 1 )
{
if ( i <= first_glyph + 6 )
{
LOG(( "metrics[%02d] = [%x %x]\n",
i,
glyph->metrics.horiBearingX,
glyph->metrics.horiAdvance ));
if ( i == first_glyph + 6 )
LOG(( "-------------------------\n" ));
}
}
Render_Glyph( x, y );
x += ( glyph->metrics.horiAdvance >> 6 ) + 1;
if ( x + size->metrics.x_ppem > bit.width )
{
x = start_x;
y += step_y;
if ( y >= bit.rows )
return FT_Err_Ok;
}
}
else
Fail++;
i++;
}
return FT_Err_Ok;
}
static
FT_Error Render_Text( int first_glyph,
int ptsize )
{
FT_F26Dot6 start_x, start_y, step_x, step_y, x, y;
int i;
FT_Error error;
const unsigned char* p;
start_x = 4;
start_y = 12 + size->metrics.y_ppem;
step_x = size->metrics.x_ppem + 4;
step_y = size->metrics.y_ppem + 10;
x = start_x;
y = start_y;
i = first_glyph;
p = Text;
while ( i > 0 && *p )
{
p++;
i--;
}
while ( *p )
{
if ( !( error = LoadChar( FT_Get_Char_Index( face,
(unsigned char)*p ),
hinted ) ) )
{
if ( debug && trace_level > 1 )
{
if ( i <= first_glyph + 6 )
{
LOG(( "metrics[%02d] = [%x %x]\n",
i,
glyph->metrics.horiBearingX,
glyph->metrics.horiAdvance ));
if ( i == first_glyph + 6 )
LOG(( "-------------------------\n" ));
}
}
Render_Glyph( x, y );
x += ( glyph->metrics.horiAdvance >> 6 ) + 1;
if ( x + size->metrics.x_ppem > bit.width )
{
x = start_x;
y += step_y;
if ( y >= bit.rows )
return FT_Err_Ok;
}
}
else
Fail++;
i++;
p++;
}
return FT_Err_Ok;
}
static
void Help( void )
{
grEvent dummy_event;
Clear_Display();
grGotoxy( 0, 0 );
grSetMargin( 2, 1 );
grGotobitmap( &bit );
grWriteln("FreeType Glyph Viewer - part of the FreeType test suite" );
grLn();
grWriteln("This program is used to display all glyphs from one or" );
grWriteln("several font files, with the FreeType library.");
grLn();
grWriteln("Use the following keys :");
grLn();
grWriteln(" F1 or ? : display this help screen" );
grWriteln(" a : toggle anti-aliasing" );
grWriteln(" h : toggle outline hinting" );
grWriteln(" b : toggle embedded bitmaps" );
grWriteln(" l : toggle low precision rendering" );
grWriteln(" space : toggle rendering mode" );
grLn();
grWriteln(" Up : increase pointsize by 1 unit" );
grWriteln(" Down : decrease pointsize by 1 unit" );
grWriteln(" Page Up : increase pointsize by 10 units" );
grWriteln(" Page Down : decrease pointsize by 10 units" );
grLn();
grWriteln(" Right : increment first glyph index" );
grWriteln(" Left : decrement first glyph index" );
grLn();
grWriteln(" F7 : decrement first glyph index by 10" );
grWriteln(" F8 : increment first glyph index by 10" );
grWriteln(" F9 : decrement first glyph index by 100");
grWriteln(" F10 : increment first glyph index by 100");
grWriteln(" F11 : decrement first glyph index by 1000");
grWriteln(" F12 : increment first glyph index by 1000");
grLn();
grWriteln("press any key to exit this help screen");
grRefreshSurface( surface );
grListenSurface( surface, gr_event_key, &dummy_event );
}
static
int Process_Event( grEvent* event )
{
int i;
switch ( event->key )
{
case grKeyEsc: /* ESC or q */
case grKEY( 'q' ):
return 0;
case grKEY( 'a' ):
antialias = !antialias;
new_header = antialias ? "anti-aliasing is now on"
: "anti-aliasing is now off";
return 1;
case grKEY( 'b' ):
use_sbits = !use_sbits;
new_header = use_sbits
? "embedded bitmaps are now used when available"
: "embedded bitmaps are now ignored";
return 1;
case grKEY( 'n' ):
case grKEY( 'p' ):
return (int)event->key;
case grKEY( 'l' ):
low_prec = !low_prec;
new_header = low_prec
? "rendering precision is now forced to low"
: "rendering precision is now normal";
break;
case grKEY( 'h' ):
hinted = !hinted;
new_header = hinted ? "glyph hinting is now active"
: "glyph hinting is now ignored";
break;
case grKEY( ' ' ):
render_mode ^= 1;
new_header = render_mode ? "rendering all glyphs in font"
: "rendering test text string" ;
break;
case grKeyF1:
case grKEY( '?' ):
Help();
return 1;
#if 0
case grKeyF3: i = 16; goto Do_Rotate;
case grKeyF4: i = -16; goto Do_Rotate;
case grKeyF5: i = 1; goto Do_Rotate;
case grKeyF6: i = -1; goto Do_Rotate;
#endif
case grKeyPageUp: i = 10; goto Do_Scale;
case grKeyPageDown: i = -10; goto Do_Scale;
case grKeyUp: i = 1; goto Do_Scale;
case grKeyDown: i = -1; goto Do_Scale;
case grKeyLeft: i = -1; goto Do_Glyph;
case grKeyRight: i = 1; goto Do_Glyph;
case grKeyF7: i = -10; goto Do_Glyph;
case grKeyF8: i = 10; goto Do_Glyph;
case grKeyF9: i = -100; goto Do_Glyph;
case grKeyF10: i = 100; goto Do_Glyph;
case grKeyF11: i = -1000; goto Do_Glyph;
case grKeyF12: i = 1000; goto Do_Glyph;
default:
;
}
return 1;
#if 0
Do_Rotate:
Rotation = ( Rotation + i ) & 1023;
return 1;
#endif
Do_Scale:
ptsize += i;
if ( ptsize < 1 ) ptsize = 1;
if ( ptsize > MAXPTSIZE ) ptsize = MAXPTSIZE;
return 1;
Do_Glyph:
Num += i;
if ( Num < 0 ) Num = 0;
if ( Num >= num_glyphs ) Num = num_glyphs - 1;
return 1;
}
static
void usage( char* execname )
{
fprintf( stderr, "\n" );
fprintf( stderr, "ftview: simple glyph viewer -- part of the FreeType project\n" );
fprintf( stderr, "-----------------------------------------------------------\n" );
fprintf( stderr, "\n" );
fprintf( stderr, "Usage: %s [options below] ppem fontname[.ttf|.ttc] ...\n",
execname );
fprintf( stderr, "\n" );
fprintf( stderr, " -d enable debugging messages\n" );
fprintf( stderr, " -l N set debugging trace level to N (default: 0, max: 7)\n" );
fprintf( stderr, " -r R use resolution R dpi (default: 72 dpi)\n" );
fprintf( stderr, " -f index specify first glyph index to display\n" );
fprintf( stderr, "\n" );
exit( 1 );
}
int main( int argc,
char* argv[] )
{
int i, old_ptsize, orig_ptsize, file;
int first_glyph = 0;
int XisSetup = 0;
char filename[128 + 4];
char alt_filename[128 + 4];
char* execname;
int option;
int file_loaded;
FT_Error error;
grEvent event;
execname = ft_basename( argv[0] );
while ( 1 )
{
option = getopt( argc, argv, "df:l:r:" );
if ( option == -1 )
break;
switch ( option )
{
case 'd':
debug = 1;
break;
case 'f':
first_glyph = atoi( optarg );
break;
case 'l':
trace_level = atoi( optarg );
if ( trace_level < 1 || trace_level > 7 )
usage( execname );
break;
case 'r':
res = atoi( optarg );
if ( res < 1 )
usage( execname );
break;
default:
usage( execname );
break;
}
}
argc -= optind;
argv += optind;
if ( argc <= 1 )
usage( execname );
if ( sscanf( argv[0], "%d", &orig_ptsize ) != 1 )
orig_ptsize = 64;
file = 1;
if ( debug )
{
#ifdef FT_DEBUG_LEVEL_TRACE
FT_SetTraceLevel( trace_any, (FT_Byte)trace_level );
#else
trace_level = 0;
#endif
}
/* Initialize engine */
error = FT_Init_FreeType( &library );
if ( error )
PanicZ( "Could not initialize FreeType library" );
NewFile:
ptsize = orig_ptsize;
hinted = 1;
file_loaded = 0;
filename[128] = '\0';
alt_filename[128] = '\0';
strncpy( filename, argv[file], 128 );
strncpy( alt_filename, argv[file], 128 );
/* try to load the file name as is, first */
error = FT_New_Face( library, argv[file], 0, &face );
if ( !error )
goto Success;
#ifndef macintosh
i = strlen( argv[file] );
while ( i > 0 && argv[file][i] != '\\' && argv[file][i] != '/' )
{
if ( argv[file][i] == '.' )
i = 0;
i--;
}
if ( i >= 0 )
{
strncpy( filename + strlen( filename ), ".ttf", 4 );
strncpy( alt_filename + strlen( alt_filename ), ".ttc", 4 );
}
#endif
/* Load face */
error = FT_New_Face( library, filename, 0, &face );
if ( error )
goto Display_Font;
Success:
file_loaded++;
error = Reset_Scale( ptsize );
if ( error )
goto Display_Font;
num_glyphs = face->num_glyphs;
glyph = face->glyph;
size = face->size;
Display_Font:
/* initialize graphics if needed */
if ( !XisSetup )
{
XisSetup = 1;
Init_Display();
}
grSetTitle( surface, "FreeType Glyph Viewer - press F1 for help" );
old_ptsize = ptsize;
if ( file_loaded >= 1 )
{
Fail = 0;
Num = first_glyph;
if ( Num >= num_glyphs )
Num = num_glyphs - 1;
if ( Num < 0 )
Num = 0;
}
for ( ;; )
{
int key;
Clear_Display();
if ( file_loaded >= 1 )
{
switch ( render_mode )
{
case 0:
Render_Text( Num, ptsize );
break;
default:
Render_All( Num, ptsize );
}
sprintf( Header, "%s %s (file `%s')",
face->family_name,
face->style_name,
ft_basename( filename ) );
if ( !new_header )
new_header = Header;
grWriteCellString( &bit, 0, 0, new_header, fore_color );
new_header = 0;
sprintf( Header, "at %d points, first glyph = %d",
ptsize,
Num );
}
else
sprintf( Header, "`%s': not a font file or could not be opened",
ft_basename( filename ) );
grWriteCellString( &bit, 0, 8, Header, fore_color );
grRefreshSurface( surface );
grListenSurface( surface, 0, &event );
if ( !( key = Process_Event( &event ) ) )
goto End;
if ( key == 'n' )
{
if (file_loaded >= 1)
FT_Done_Face( face );
if ( file < argc - 1 )
file++;
goto NewFile;
}
if ( key == 'p' )
{
if ( file_loaded >= 1 )
FT_Done_Face( face );
if ( file > 1 )
file--;
goto NewFile;
}
if ( ptsize != old_ptsize )
{
if ( Reset_Scale( ptsize ) )
PanicZ( "Could not resize font." );
old_ptsize = ptsize;
}
}
End:
#if 0
grDoneSurface(surface);
grDone();
#endif
printf( "Execution completed successfully.\n" );
printf( "Fails = %d\n", Fail );
exit( 0 ); /* for safety reasons */
return 0; /* never reached */
}
/* End */