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a new program to demonstrate the new convenience glyph

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API (see include/ftglyph.h).

Supports kerning, rotation, sub-pixel rendering..
Could be easily modified to reach the level of strtto when
we have the relevant OpenType module handy..
VER-2-0-4-PATCH
David Turner 25 years ago
parent 6b0149b826
commit b5c1a4e567
1 changed files with 835 additions and 0 deletions
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  1. 835
      demos/src/ftstring.c

835
demos/src/ftstring.c
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/****************************************************************************/
/* */
/* The FreeType project -- a free and portable quality TrueType renderer. */
/* */
/* Copyright 1996-1999 by */
/* D. Turner, R.Wilhelm, and W. Lemberg */
/* */
/* */
/* FTString.c - simple text string display */
/* */
/****************************************************************************/
#include "freetype.h"
#include "ftglyph.h"
#include "common.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <math.h>
#include "graph.h"
#include "grfont.h"
#include "ftgrays.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 */
static char Header[128];
static char* new_header = 0;
static unsigned char* Text = "The quick brown fox jumps over the lazy dog";
static FT_Library library; /* the FreeType library */
static FT_Face face; /* the font face */
static FT_Error error; /* error returned by FreeType ? */
static grSurface* surface; /* current display surface */
static grBitmap bit; /* current display bitmap */
static int ptsize; /* current point size */
static int Num;
static int Rotation = 0;
static int Fail;
static int hinted = 1; /* is glyph hinting active ? */
static int antialias = 1; /* is anti-aliasing active ? */
static int use_sbits = 1; /* do we use embedded bitmaps ? */
static int kerning = 1;
static int res = 72; /* default resolution in dpi */
static grColor fore_color = { 127 };
static int graph_init = 0;
static int render_mode = 1;
static int use_grays = 0;
/* the standard raster's interface */
static FT_Raster_Funcs std_raster;
static FT_Matrix trans_matrix;
static int transform = 0;
static FT_Vector string_center;
typedef struct TGlyph_
{
FT_UInt glyph_index; /* glyph index in face */
FT_Vector pos; /* position of glyph origin */
FT_Glyph image; /* glyph image */
} TGlyph, *PGlyph;
#define FLOOR(x) ((x) & -64)
#define CEIL(x) (((x)+63) & -64)
#define TRUNC(x) ((x) >> 6)
/****************************************************************************/
/****************************************************************************/
/****************************************************************************/
/**** ****/
/**** U T I L I T Y F U N C T I O N S ****/
/**** ****/
/**** ****/
/****************************************************************************/
/****************************************************************************/
/****************************************************************************/
#define DEBUGxxx
#ifdef DEBUG
#define LOG(x) LogMessage##x
#else
#define LOG(x) /* rien */
#endif
#ifdef DEBUG
static void LogMessage( const char* fmt, ... )
{
va_list ap;
va_start( ap, fmt );
vfprintf( stderr, fmt, ap );
va_end( ap );
}
#endif
/* PanicZ */
static void PanicZ( const char* message )
{
fprintf( stderr, "%s\n error = 0x%04x\n", message, error );
exit(1);
}
/****************************************************************************/
/****************************************************************************/
/****************************************************************************/
/**** ****/
/**** D I S P L A Y M A N A G E M E N T ****/
/**** ****/
/**** ****/
/****************************************************************************/
/****************************************************************************/
/****************************************************************************/
#define MAX_GLYPHS 512
/***********************************************************************
*
* The following arrays are used to store the glyph set that makes
* up a string of text..
*
*/
static TGlyph glyphs[ MAX_GLYPHS ];
static int num_glyphs;
/**************************************************************
*
* Initialise the display surface
*
*/
static int init_display( void )
{
grInitDevices();
bit.mode = gr_pixel_mode_gray;
bit.width = DIM_X;
bit.rows = DIM_Y;
bit.grays = 128;
surface = grNewSurface( 0, &bit );
if (!surface)
PanicZ( "could not allocate display surface\n" );
graph_init = 1;
return 0;
}
/**************************************************************
*
* Clears the display surface
*
*/
static void clear_display( void )
{
long size = (long)bit.pitch * bit.rows;
if (size < 0) size = -size;
memset( bit.buffer, 0, size );
}
static FT_Error reset_scale( int pointSize )
{
FT_Error error;
error = FT_Set_Char_Size( face, pointSize << 6,
pointSize << 6,
res,
res );
return FT_Err_Ok;
}
/**************************************************************
*
* Compute the dimension of a string of glyphs in pixels
*
*/
static void compute_bbox( FT_BBox* abbox )
{
PGlyph glyph = glyphs;
FT_BBox bbox;
int n;
bbox.xMin = 32000; bbox.xMax = -32000;
bbox.yMin = 32000; bbox.yMax = -32000;
for ( n = 0; n < num_glyphs; n++, glyph++ )
{
FT_BBox cbox;
FT_Pos x, y;
if (!glyph->image) continue;
x = glyph->pos.x >> 6;
y = glyph->pos.y >> 6;
FT_Glyph_Get_Box( glyph->image, &cbox );
cbox.xMin += x;
cbox.yMin += y;
cbox.xMax += x;
cbox.yMax += y;
if (cbox.xMin < bbox.xMin) bbox.xMin = cbox.xMin;
if (cbox.xMax > bbox.xMax) bbox.xMax = cbox.xMax;
if (cbox.yMin < bbox.yMin) bbox.yMin = cbox.yMin;
if (cbox.yMax > bbox.yMax) bbox.yMax = cbox.yMax;
}
*abbox = bbox;
}
/**************************************************************
*
* Layout a string of glyphs
*
*/
static void layout_glyphs( void )
{
PGlyph glyph = glyphs;
FT_Error error;
int n;
FT_Vector origin;
FT_Pos origin_x = 0;
FT_UInt load_flags;
FT_UInt num_grays;
FT_UInt prev_index = 0;
load_flags = FT_LOAD_DEFAULT;
if( !hinted )
load_flags |= FT_LOAD_NO_HINTING;
num_grays = 128;
if (!antialias)
num_grays = 0;
for ( n = 0; n < num_glyphs; n++, glyph++ )
{
/* compute glyph origin */
if (kerning)
{
if (prev_index)
{
FT_Vector kern;
FT_Get_Kerning( face, prev_index, glyph->glyph_index, &kern );
kern.x = FT_MulFix( kern.x, face->size->metrics.x_scale );
if (hinted) kern.x = (kern.x+32) & -64;
origin_x += kern.x;
}
prev_index = glyph->glyph_index;
}
origin.x = origin_x;
origin.y = 0;
if (transform)
FT_Vector_Transform( &origin, &trans_matrix );
/* clear existing image if there is one */
if (glyph->image)
FT_Done_Glyph(glyph->image);
/* load the glyph image */
/* for now, we take a monochrome glyph bitmap */
error = FT_Get_Glyph_Bitmap( face, glyph->glyph_index,
load_flags,
num_grays,
&origin,
(FT_BitmapGlyph*)&glyph->image );
if (error) continue;
glyph->pos = origin;
origin_x += glyph->image->advance;
}
string_center.x = origin_x / 2;
string_center.y = 0;
if (transform)
FT_Vector_Transform( &string_center, &trans_matrix );
}
/**************************************************************
*
* Renders a given glyph vector set
*
*/
static void render_string( FT_Pos x, FT_Pos y )
{
PGlyph glyph = glyphs;
grBitmap bit3;
int n;
for ( n = 0; n < num_glyphs; n++, glyph++ )
{
if (!glyph->image)
continue;
switch (glyph->image->glyph_type)
{
case ft_glyph_type_bitmap:
{
/* this is a bitmap, we simply blit it to our target surface */
FT_BitmapGlyph bitm = (FT_BitmapGlyph)glyph->image;
FT_Bitmap* source = &bitm->bitmap;
FT_Pos x_top, y_top;
bit3.rows = source->rows;
bit3.width = source->width;
bit3.pitch = source->pitch;
bit3.buffer = source->buffer;
switch (source->pixel_mode)
{
case ft_pixel_mode_mono:
bit3.mode = gr_pixel_mode_mono;
break;
case ft_pixel_mode_grays:
bit3.mode = gr_pixel_mode_gray;
bit3.grays = source->num_grays;
break;
default:
continue;
}
/* now render the bitmap into the display surface */
x_top = x + (glyph->pos.x >> 6) + bitm->left;
y_top = y - (glyph->pos.y >> 6) - bitm->top;
grBlitGlyphToBitmap( &bit, &bit3, x_top, y_top, fore_color );
}
break;
#if 0
case ft_glyph_type_outline:
{
/* in the case of outlines, we directly render it into the */
/* target surface with the smooth renderer.. */
FT_OutlineGlyph out = (FT_OutlineGlyph)glyph->image;
FT_Outline_Translate( (x+pen_pos[n]) << 6, (y+
error = FT_Outline_Render(
}
break;
#endif
default:
;
}
}
}
/**************************************************************
*
* Convert a string of text into a glyph vector
*
* XXX: For now, we perform a trivial conversion
*
*/
static void prepare_text( const char* string )
{
const unsigned char* p = (const unsigned char*)string;
PGlyph glyph = glyphs;
FT_UInt glyph_index;
num_glyphs = 0;
while (*p)
{
glyph_index = FT_Get_Char_Index( face, (FT_ULong)*p );
glyph->glyph_index = glyph_index;
glyph++;
num_glyphs++;
if (num_glyphs >= MAX_GLYPHS)
break;
p++;
}
}
static void reset_transform( void )
{
double angle = Rotation*3.14159/64.0;
FT_Fixed cosinus = (FT_Fixed)(cos(angle)*65536.0);
FT_Fixed sinus = (FT_Fixed)(sin(angle)*65536.0);
transform = (angle != 0);
trans_matrix.xx = cosinus;
trans_matrix.xy = -sinus;
trans_matrix.yx = sinus;
trans_matrix.yy = cosinus;
FT_Set_Transform(face,&trans_matrix, 0);
}
/****************************************************************************/
/****************************************************************************/
/****************************************************************************/
/**** ****/
/**** E V E N T H A N D L I N G ****/
/**** ****/
/**** ****/
/****************************************************************************/
/****************************************************************************/
/****************************************************************************/
static void Help( )
{
grEvent dummy_event;
clear_display();
grGotoxy( 0, 0 );
grSetMargin( 2, 1 );
grGotobitmap( &bit );
grWriteln("FreeType String Viewer - part of the FreeType test suite" );
grLn();
grWriteln("This program is used to display a string of text using" );
grWriteln("the new convenience API of the FreeType 2 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(" k : toggle kerning" );
grWriteln(" g : toggle between 'smooth' and 'standard' anti-aliaser" );
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 : rotate counter-clockwise" );
grWriteln(" Left : rotate clockwise" );
grWriteln(" F7 : big rotate counter-clockwise");
grWriteln(" F8 : big rotate clockwise");
grLn();
grWriteln("press any key to exit this help screen");
grRefreshSurface( surface );
grListenSurface( surface, gr_event_key, &dummy_event );
}
static void reset_raster( void )
{
FT_Error error;
error = 1;
if ( use_grays && antialias )
error = FT_Set_Raster( library, &ft_grays_raster );
if (error)
(void)FT_Set_Raster( library, &std_raster );
}
static int Process_Event( grEvent* event )
{
int i;
switch ( event->key )
{
case grKeyEsc: /* ESC or q */
case grKEY('q'):
return 0;
case grKEY('k'):
kerning = !kerning;
new_header = ( kerning
? "kerning is now active"
: "kerning is now ignored" );
return 1;
case grKEY('a'):
antialias = !antialias;
new_header = ( antialias
? "anti-aliasing is now on"
: "anti-aliasing is now off" );
reset_raster();
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('g'):
use_grays = !use_grays;
new_header = ( use_grays
? "now using the smooth anti-aliaser"
: "now using the standard anti-aliaser" );
reset_raster();
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_Rotate;
case grKeyRight: i = 1; goto Do_Rotate;
case grKeyF7: i = -10; goto Do_Rotate;
case grKeyF8: i = 10; goto Do_Rotate;
default:
;
}
return 1;
Do_Rotate:
Rotation = (Rotation + i) & 127;
return 1;
Do_Scale:
ptsize += i;
if (ptsize < 1) ptsize = 1;
if (ptsize > MAXPTSIZE) ptsize = MAXPTSIZE;
return 1;
#if 0
Do_Glyph:
Num += i;
if (Num < 0) Num = 0;
if (Num >= num_glyphs) Num = num_glyphs-1;
return 1;
#endif
}
/****************************************************************************/
/****************************************************************************/
/****************************************************************************/
/**** ****/
/**** M A I N P R O G R A M ****/
/**** ****/
/**** ****/
/****************************************************************************/
/****************************************************************************/
/****************************************************************************/
static void usage( char* execname )
{
fprintf( stderr, "\n" );
fprintf( stderr, "ftview: simple string 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, " -r R use resolution R dpi (default: 72 dpi)\n" );
fprintf( stderr, " -m message message 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, "m:r:" );
if ( option == -1 )
break;
switch ( option )
{
case 'r':
res = atoi( optarg );
if ( res < 1 )
usage( execname );
break;
case 'm':
if (argc < 3)
usage( execname );
Text = optarg;
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;
/* Initialize engine */
error = FT_Init_FreeType( &library );
if (error) PanicZ( "Could not initialise FreeType library" );
/* retrieve the standard raster's interface */
(void)FT_Get_Raster( library, ft_glyph_format_outline, &std_raster );
NewFile:
ptsize = orig_ptsize;
hinted = 1;
file_loaded = 0;
#ifndef macintosh
i = strlen( argv[file] );
while ( i > 0 && argv[file][i] != '\\' && argv[file][i] != '/' )
{
if ( argv[file][i] == '.' )
i = 0;
i--;
}
#endif
filename[128] = '\0';
alt_filename[128] = '\0';
strncpy( filename, argv[file], 128 );
strncpy( alt_filename, argv[file], 128 );
#ifndef macintosh
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;
/* prepare the text to be rendered */
prepare_text( Text );
file_loaded++;
error = reset_scale( ptsize );
if (error) goto Display_Font;
Display_Font:
/* initialise graphics if needed */
if ( !XisSetup )
{
XisSetup = 1;
init_display();
}
grSetTitle( surface, "FreeType String 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 )
{
/* layout & render string */
{
FT_BBox bbox;
reset_transform();
layout_glyphs();
compute_bbox( &bbox );
render_string( (bit.width-(string_center.x >> 5))/2,
(bit.rows +(string_center.y >> 5))/2 );
}
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, rotation = %d",
ptsize,
Rotation );
}
else
{
sprintf( Header, "%s : is 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 Fin;
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;
}
}
Fin:
#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 */
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