ref: 84989770721391018dd6a247831cb79a43c1d86b
dir: /libfreetype/bdfdrivr.c/
/* bdfdrivr.c
FreeType font driver for bdf files
Copyright (C) 2001-2002 by
Francesco Zappa Nardelli
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
#include <ft2build.h>
#include FT_INTERNAL_DEBUG_H
#include FT_INTERNAL_STREAM_H
#include FT_INTERNAL_OBJECTS_H
#include "bdf.h"
#include "bdfdrivr.h"
#include "bdferror.h"
/*************************************************************************/
/* */
/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
/* messages during execution. */
/* */
#undef FT_COMPONENT
#define FT_COMPONENT trace_bdfdriver
typedef struct BDF_CMapRec_
{
FT_CMapRec cmap;
FT_UInt num_encodings;
BDF_encoding_el* encodings;
} BDF_CMapRec, *BDF_CMap;
FT_CALLBACK_DEF( FT_Error )
bdf_cmap_init( BDF_CMap cmap )
{
BDF_Face face = (BDF_Face)FT_CMAP_FACE( cmap );
cmap->num_encodings = face->bdffont->glyphs_used;
cmap->encodings = face->en_table;
return FT_Err_Ok;
}
FT_CALLBACK_DEF( void )
bdf_cmap_done( BDF_CMap cmap )
{
cmap->encodings = NULL;
cmap->num_encodings = 0;
}
FT_CALLBACK_DEF( FT_UInt )
bdf_cmap_char_index( BDF_CMap cmap,
FT_UInt32 charcode )
{
BDF_encoding_el* encodings = cmap->encodings;
FT_UInt min, max, mid;
FT_UInt result = 0;
min = 0;
max = cmap->num_encodings;
while ( min < max )
{
FT_UInt32 code;
mid = ( min + max ) >> 1;
code = encodings[mid].enc;
if ( charcode == code )
{
result = encodings[mid].glyph + 1;
break;
}
if ( charcode < code )
max = mid;
else
min = mid + 1;
}
return result;
}
FT_CALLBACK_DEF( FT_UInt )
bdf_cmap_char_next( BDF_CMap cmap,
FT_UInt32 *acharcode )
{
BDF_encoding_el* encodings = cmap->encodings;
FT_UInt min, max, mid;
FT_UInt32 charcode = *acharcode + 1;
FT_UInt result = 0;
min = 0;
max = cmap->num_encodings;
while ( min < max )
{
FT_UInt32 code;
mid = ( min + max ) >> 1;
code = encodings[mid].enc;
if ( charcode == code )
{
result = encodings[mid].glyph + 1;
goto Exit;
}
if ( charcode < code )
max = mid;
else
min = mid + 1;
}
charcode = 0;
if ( min < cmap->num_encodings )
{
charcode = encodings[min].enc;
result = encodings[min].glyph + 1;
}
Exit:
*acharcode = charcode;
return result;
}
FT_CALLBACK_TABLE_DEF const FT_CMap_ClassRec bdf_cmap_class =
{
sizeof( BDF_CMapRec ),
(FT_CMap_InitFunc) bdf_cmap_init,
(FT_CMap_DoneFunc) bdf_cmap_done,
(FT_CMap_CharIndexFunc)bdf_cmap_char_index,
(FT_CMap_CharNextFunc) bdf_cmap_char_next
};
FT_CALLBACK_DEF( FT_Error )
BDF_Face_Done( BDF_Face face )
{
FT_Memory memory = FT_FACE_MEMORY( face );
bdf_free_font( face->bdffont );
FT_FREE( face->en_table );
FT_FREE( face->charset_encoding );
FT_FREE( face->charset_registry );
FT_FREE( face->root.family_name );
FT_FREE( face->root.available_sizes );
FT_FREE( face->bdffont );
FT_TRACE4(( "BDF_Face_Done: done face\n" ));
return BDF_Err_Ok;
}
FT_CALLBACK_DEF( FT_Error )
BDF_Face_Init( FT_Stream stream,
BDF_Face face,
FT_Int face_index,
FT_Int num_params,
FT_Parameter* params )
{
FT_Error error = BDF_Err_Ok;
FT_Memory memory = FT_FACE_MEMORY( face );
bdf_font_t* font;
bdf_options_t options;
FT_UNUSED( num_params );
FT_UNUSED( params );
FT_UNUSED( face_index );
if ( FT_STREAM_SEEK( 0 ) )
goto Exit;
options.correct_metrics = 1; /* FZ XXX: options semantics */
options.keep_unencoded = 1;
options.keep_comments = 0;
options.font_spacing = BDF_PROPORTIONAL;
error = bdf_load_font( stream, memory, &options, &font );
if ( error == BDF_Err_Missing_Startfont_Field )
{
FT_TRACE2(( "[not a valid BDF file]\n" ));
goto Fail;
}
else if ( error )
goto Exit;
/* we have a bdf font: let's construct the face object */
face->bdffont = font;
{
FT_Face root = FT_FACE( face );
bdf_property_t* prop = NULL;
FT_TRACE4(( "number of glyphs: %d (%d)\n",
font->glyphs_size,
font->glyphs_used ));
FT_TRACE4(( "number of unencoded glyphs: %d (%d)\n",
font->unencoded_size,
font->unencoded_used ));
root->num_faces = 1;
root->face_index = 0;
root->face_flags = FT_FACE_FLAG_FIXED_SIZES |
FT_FACE_FLAG_HORIZONTAL |
FT_FACE_FLAG_FAST_GLYPHS;
prop = bdf_get_font_property( font, (char *)"SPACING" );
if ( prop != NULL )
if ( prop->format == BDF_ATOM )
if ( prop->value.atom != NULL )
if ( ( *(prop->value.atom) == 'M' ) ||
( *(prop->value.atom) == 'C' ) )
root->face_flags |= FT_FACE_FLAG_FIXED_WIDTH;
/* FZ XXX: TO DO: FT_FACE_FLAGS_VERTICAL */
/* FZ XXX: I need a font to implement this */
root->style_flags = 0;
prop = bdf_get_font_property( font, (char *)"SLANT" );
if ( prop != NULL )
if ( prop->format == BDF_ATOM )
if ( prop->value.atom != NULL )
if ( ( *(prop->value.atom) == 'O' ) ||
( *(prop->value.atom) == 'I' ) )
root->style_flags |= FT_STYLE_FLAG_ITALIC;
prop = bdf_get_font_property( font, (char *)"WEIGHT_NAME" );
if ( prop != NULL )
if ( prop->format == BDF_ATOM )
if ( prop->value.atom != NULL )
if ( *(prop->value.atom) == 'B' )
root->style_flags |= FT_STYLE_FLAG_BOLD;
prop = bdf_get_font_property( font, (char *)"FAMILY_NAME" );
if ( ( prop != NULL ) && ( prop->value.atom != NULL ) )
{
int l = ft_strlen( prop->value.atom ) + 1;
if ( FT_NEW_ARRAY( root->family_name, l ) )
goto Exit;
ft_strcpy( root->family_name, prop->value.atom );
}
else
root->family_name = 0;
root->style_name = (char *)"Regular";
if ( root->style_flags & FT_STYLE_FLAG_BOLD )
{
if ( root->style_flags & FT_STYLE_FLAG_ITALIC )
root->style_name = (char *)"Bold Italic";
else
root->style_name = (char *)"Bold";
}
else if ( root->style_flags & FT_STYLE_FLAG_ITALIC )
root->style_name = (char *)"Italic";
root->num_glyphs = font->glyphs_size; /* unencoded included */
root->num_fixed_sizes = 1;
if ( FT_NEW_ARRAY( root->available_sizes, 1 ) )
goto Exit;
prop = bdf_get_font_property( font, (char *)"AVERAGE_WIDTH" );
if ( ( prop != NULL ) && ( prop->value.int32 >= 10 ) )
root->available_sizes->width = (short)( prop->value.int32 / 10 );
prop = bdf_get_font_property( font, (char *)"PIXEL_SIZE" );
if ( prop != NULL )
root->available_sizes->height = (short) prop->value.int32;
else
{
prop = bdf_get_font_property( font, (char *)"POINT_SIZE" );
if ( prop != NULL )
{
bdf_property_t *yres;
yres = bdf_get_font_property( font, (char *)"RESOLUTION_Y" );
if ( yres != NULL )
{
FT_TRACE4(( "POINT_SIZE: %d RESOLUTION_Y: %d\n",
prop->value.int32, yres->value.int32 ));
root->available_sizes->height =
(FT_Short)( prop->value.int32 * yres->value.int32 / 720 );
}
}
}
if ( root->available_sizes->width == 0 )
{
if ( root->available_sizes->height == 0 )
{
/* some fonts have broken SIZE declaration (jiskan24.bdf) */
FT_ERROR(( "BDF_Face_Init: reading size\n" ));
root->available_sizes->width = (FT_Short)font->point_size;
}
else
root->available_sizes->width = root->available_sizes->height;
}
if ( root->available_sizes->height == 0 )
root->available_sizes->height = root->available_sizes->width;
/* encoding table */
{
bdf_glyph_t* cur = font->glyphs;
unsigned long n;
if ( FT_NEW_ARRAY( face->en_table, font->glyphs_size ) )
goto Exit;
for ( n = 0; n < font->glyphs_size; n++ )
{
(face->en_table[n]).enc = cur[n].encoding;
FT_TRACE4(( "idx %d, val 0x%lX\n", n, cur[n].encoding ));
(face->en_table[n]).glyph = (FT_Short)n;
}
}
/* charmaps */
{
bdf_property_t *charset_registry = 0, *charset_encoding = 0;
FT_Bool unicode_charmap = 0;
charset_registry =
bdf_get_font_property( font, (char *)"CHARSET_REGISTRY" );
charset_encoding =
bdf_get_font_property( font, (char *)"CHARSET_ENCODING" );
if ( ( charset_registry != NULL ) && ( charset_encoding != NULL ) )
{
if ( ( charset_registry->format == BDF_ATOM ) &&
( charset_encoding->format == BDF_ATOM ) &&
( charset_registry->value.atom != NULL ) &&
( charset_encoding->value.atom != NULL ) )
{
if ( FT_NEW_ARRAY( face->charset_encoding,
strlen( charset_encoding->value.atom ) + 1 ) )
goto Exit;
if ( FT_NEW_ARRAY( face->charset_registry,
strlen( charset_registry->value.atom ) + 1 ) )
goto Exit;
ft_strcpy( face->charset_registry, charset_registry->value.atom );
ft_strcpy( face->charset_encoding, charset_encoding->value.atom );
if ( !ft_strcmp( face->charset_registry, "ISO10646" ) ||
( !ft_strcmp( face->charset_registry, "ISO8859" ) &&
!ft_strcmp( face->charset_encoding, "1" ) ) )
unicode_charmap = 1;
{
FT_CharMapRec charmap;
charmap.face = FT_FACE( face );
charmap.encoding = FT_ENCODING_NONE;
charmap.platform_id = 0;
charmap.encoding_id = 0;
if ( unicode_charmap )
{
charmap.encoding = FT_ENCODING_UNICODE;
charmap.platform_id = 3;
charmap.encoding_id = 1;
}
error = FT_CMap_New( &bdf_cmap_class, NULL, &charmap, NULL );
#if 0
/* Select default charmap */
if (root->num_charmaps)
root->charmap = root->charmaps[0];
#endif
}
goto Exit;
}
}
/* otherwise assume Adobe standard encoding */
{
FT_CharMapRec charmap;
charmap.face = FT_FACE( face );
charmap.encoding = FT_ENCODING_ADOBE_STANDARD;
charmap.platform_id = 7;
charmap.encoding_id = 0;
error = FT_CMap_New( &bdf_cmap_class, NULL, &charmap, NULL );
/* Select default charmap */
if (root->num_charmaps)
root->charmap = root->charmaps[0];
}
}
}
Exit:
return error;
Fail:
BDF_Face_Done( face );
return BDF_Err_Unknown_File_Format;
}
static FT_Error
BDF_Set_Pixel_Size( FT_Size size )
{
BDF_Face face = (BDF_Face)FT_SIZE_FACE( size );
FT_Face root = FT_FACE( face );
FT_TRACE4(( "rec %d - pres %d\n",
size->metrics.y_ppem, root->available_sizes->height ));
if ( size->metrics.y_ppem == root->available_sizes->height )
{
size->metrics.ascender = face->bdffont->bbx.ascent << 6;
size->metrics.descender = face->bdffont->bbx.descent * ( -64 );
size->metrics.height = face->bdffont->bbx.height << 6;
return BDF_Err_Ok;
}
else
return BDF_Err_Invalid_Pixel_Size;
}
static FT_Error
BDF_Glyph_Load( FT_GlyphSlot slot,
FT_Size size,
FT_UInt glyph_index,
FT_Int32 load_flags )
{
BDF_Face face = (BDF_Face)FT_SIZE_FACE( size );
FT_Error error = BDF_Err_Ok;
FT_Bitmap* bitmap = &slot->bitmap;
bdf_glyph_t glyph;
int bpp = face->bdffont->bpp;
int i, j, count;
unsigned char *p, *pp;
FT_Memory memory = face->bdffont->memory;
FT_UNUSED( load_flags );
if ( !face )
{
error = BDF_Err_Invalid_Argument;
goto Exit;
}
if ( glyph_index > 0 )
glyph_index--;
/* slot, bitmap => freetype, glyph => bdflib */
glyph = face->bdffont->glyphs[glyph_index];
bitmap->rows = glyph.bbx.height;
bitmap->width = glyph.bbx.width;
if ( bpp == 1 )
{
bitmap->pixel_mode = FT_PIXEL_MODE_MONO;
bitmap->pitch = glyph.bpr;
if ( FT_NEW_ARRAY( bitmap->buffer, glyph.bytes ) )
goto Exit;
FT_MEM_COPY( bitmap->buffer, glyph.bitmap, glyph.bytes );
}
else
{
/* blow up pixmap to have 8 bits per pixel */
bitmap->pixel_mode = FT_PIXEL_MODE_GRAY;
bitmap->pitch = bitmap->width;
if ( FT_NEW_ARRAY( bitmap->buffer, bitmap->rows * bitmap->pitch ) )
goto Exit;
switch ( bpp )
{
case 2:
bitmap->num_grays = 4;
count = 0;
p = glyph.bitmap;
for ( i = 0; i < bitmap->rows; i++ )
{
pp = p;
/* get the full bytes */
for ( j = 0; j < ( bitmap->width >> 2 ); j++ )
{
bitmap->buffer[count++] = (FT_Byte)( ( *pp & 0xC0 ) >> 6 );
bitmap->buffer[count++] = (FT_Byte)( ( *pp & 0x30 ) >> 4 );
bitmap->buffer[count++] = (FT_Byte)( ( *pp & 0x0C ) >> 2 );
bitmap->buffer[count++] = (FT_Byte)( *pp & 0x03 );
pp++;
}
/* get remaining pixels (if any) */
switch ( bitmap->width & 3 )
{
case 3:
bitmap->buffer[count++] = (FT_Byte)( ( *pp & 0xC0 ) >> 6 );
/* fall through */
case 2:
bitmap->buffer[count++] = (FT_Byte)( ( *pp & 0x30 ) >> 4 );
/* fall through */
case 1:
bitmap->buffer[count++] = (FT_Byte)( ( *pp & 0x0C ) >> 2 );
/* fall through */
case 0:
break;
}
p += glyph.bpr;
}
break;
case 4:
bitmap->num_grays = 16;
count = 0;
p = glyph.bitmap;
for ( i = 0; i < bitmap->rows; i++ )
{
pp = p;
/* get the full bytes */
for ( j = 0; j < ( bitmap->width >> 1 ); j++ )
{
bitmap->buffer[count++] = (FT_Byte)( ( *pp & 0xF0 ) >> 4 );
bitmap->buffer[count++] = (FT_Byte)( *pp & 0x0F );
pp++;
}
/* get remaining pixel (if any) */
switch ( bitmap->width & 1 )
{
case 1:
bitmap->buffer[count++] = (FT_Byte)( ( *pp & 0xF0 ) >> 4 );
/* fall through */
case 0:
break;
}
p += glyph.bpr;
}
break;
case 8:
bitmap->num_grays = 256;
FT_MEM_COPY( bitmap->buffer, glyph.bitmap,
bitmap->rows * bitmap->pitch );
break;
}
}
slot->bitmap_left = 0;
slot->bitmap_top = glyph.bbx.ascent;
/* FZ XXX: TODO: vertical metrics */
slot->metrics.horiAdvance = glyph.dwidth << 6;
slot->metrics.horiBearingX = glyph.bbx.x_offset << 6;
slot->metrics.horiBearingY = ( glyph.bbx.y_offset +
glyph.bbx.height ) << 6;
slot->metrics.width = bitmap->width << 6;
slot->metrics.height = bitmap->rows << 6;
slot->linearHoriAdvance = (FT_Fixed)glyph.dwidth << 16;
slot->format = FT_GLYPH_FORMAT_BITMAP;
slot->flags = FT_GLYPH_OWN_BITMAP;
Exit:
return error;
}
FT_CALLBACK_TABLE_DEF
const FT_Driver_ClassRec bdf_driver_class =
{
{
ft_module_font_driver,
sizeof ( FT_DriverRec ),
"bdf",
0x10000L,
0x20000L,
0,
(FT_Module_Constructor)0,
(FT_Module_Destructor) 0,
(FT_Module_Requester) 0
},
sizeof ( BDF_FaceRec ),
sizeof ( FT_SizeRec ),
sizeof ( FT_GlyphSlotRec ),
(FT_Face_InitFunc) BDF_Face_Init,
(FT_Face_DoneFunc) BDF_Face_Done,
(FT_Size_InitFunc) 0,
(FT_Size_DoneFunc) 0,
(FT_Slot_InitFunc) 0,
(FT_Slot_DoneFunc) 0,
(FT_Size_ResetPointsFunc) BDF_Set_Pixel_Size,
(FT_Size_ResetPixelsFunc) BDF_Set_Pixel_Size,
(FT_Slot_LoadFunc) BDF_Glyph_Load,
(FT_Face_GetKerningFunc) 0,
(FT_Face_AttachFunc) 0,
(FT_Face_GetAdvancesFunc) 0
};
/* END */