ref: 7eedf08747a9d12d5444ee4d57c2a8b66ff93f5c
dir: /src/pcf/pcfdriver.c/
/* pcfdriver.c
FreeType font driver for pcf files
Copyright (C) 2000-2001 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 "pcf.h"
#include "pcfdriver.h"
#include "pcfutil.h"
#include "pcferror.h"
#undef FT_COMPONENT
#define FT_COMPONENT trace_pcfread
#ifdef FT_CONFIG_OPTION_USE_CMAPS
typedef struct PCF_CMapRec_
{
FT_CMapRec cmap;
FT_UInt num_encodings;
PCF_Encoding encodings;
} PCF_CMapRec, *PCF_CMap;
FT_CALLBACK_DEF( FT_Error )
pcf_cmap_init( PCF_CMap cmap )
{
PCF_Face face = (PCF_Face) FT_CMAP_FACE(cmap);
cmap->num_encodings = (FT_UInt) face->nencodings;
cmap->encodings = face->encodings;
return FT_Err_Ok;
}
FT_CALLBACK_DEF( void )
pcf_cmap_done( PCF_CMap cmap )
{
cmap->encodings = NULL;
cmap->num_encodings = 0;
}
FT_CALLBACK_DEF( FT_UInt )
pcf_cmap_char_index( FT_CMap cmap,
FT_UInt32 charcode )
{
PCF_Encoding encoding = 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;
break;
}
if ( charcode < code )
max = mid;
else
min = mid+1;
}
return result;
}
FT_CALLBACK_DEF( FT_UInt )
pcf_cmap_char_next( PCF_CMap cmap,
FT_UInt32 *acharcode )
{
PCF_Encoding 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;
goto Exit;
}
if ( charcode < code )
max = mid;
else
min = mid+1;
}
charcode = 0;
if ( ++min < cmap->num_encodings )
{
charcode = encodings[min].enc;
glyph = encodings[min].glyph;
}
Exit:
*acharcode = charcode;
return result;
}
FT_CALLBACK_TABLE const FT_CMap_ClassRec pcf_cmap_class =
{
sizeof( PCF_CMapRec ),
(FT_CMap_InitFunc) pcf_cmap_init,
(FT_CMap_DoneFunc) pcf_cmap_done,
(FT_CMap_CharIndexFunc) pcf_cmap_char_index,
(FT_CMap_CharNextFunc) pcf_cmap_char_next
};
#else /* !FT_CONFIG_OPTION_USE_CMAPS */
static FT_UInt
PCF_Char_Get_Index( FT_CharMap charmap,
FT_Long char_code )
{
PCF_Face face = (PCF_Face)charmap->face;
PCF_Encoding en_table = face->encodings;
int low, high, mid;
FT_TRACE4(( "get_char_index %ld\n", char_code ));
low = 0;
high = face->nencodings - 1;
while ( low <= high )
{
mid = ( low + high ) / 2;
if ( char_code < en_table[mid].enc )
high = mid - 1;
else if ( char_code > en_table[mid].enc )
low = mid + 1;
else
return en_table[mid].glyph;
}
return 0;
}
static FT_Long
PCF_Char_Get_Next( FT_CharMap charmap,
FT_Long char_code )
{
PCF_Face face = (PCF_Face)charmap->face;
PCF_Encoding en_table = face->encodings;
int low, high, mid;
FT_TRACE4(( "get_next_char %ld\n", char_code ));
char_code++;
low = 0;
high = face->nencodings - 1;
while ( low <= high )
{
mid = ( low + high ) / 2;
if ( char_code < en_table[mid].enc )
high = mid - 1;
else if ( char_code > en_table[mid].enc )
low = mid + 1;
else
return char_code;
}
if ( high < 0 )
high = 0;
while ( high < face->nencodings )
{
if ( en_table[high].enc >= char_code )
return en_table[high].enc;
high++;
}
return 0;
}
#endif /* !FT_CONFIG_OPTION_USE_CMAPS */
/*************************************************************************/
/* */
/* 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_pcfdriver
FT_CALLBACK_DEF( FT_Error )
PCF_Face_Done( PCF_Face face )
{
FT_Memory memory = FT_FACE_MEMORY( face );
FT_FREE( face->encodings );
FT_FREE( face->metrics );
/* free properties */
{
PCF_Property prop = face->properties;
FT_Int i;
for ( i = 0; i < face->nprops; i++ )
{
prop = &face->properties[i];
FT_FREE( prop->name );
if ( prop->isString )
FT_FREE( prop->value );
}
FT_FREE( face->properties );
}
FT_FREE( face->toc.tables );
FT_FREE( face->root.family_name );
FT_FREE( face->root.available_sizes );
FT_FREE( face->charset_encoding );
FT_FREE( face->charset_registry );
FT_TRACE4(( "DONE_FACE!!!\n" ));
return PCF_Err_Ok;
}
FT_CALLBACK_DEF( FT_Error )
PCF_Face_Init( FT_Stream stream,
PCF_Face face,
FT_Int face_index,
FT_Int num_params,
FT_Parameter* params )
{
FT_Error error = PCF_Err_Ok;
FT_UNUSED( num_params );
FT_UNUSED( params );
FT_UNUSED( face_index );
error = pcf_load_font( stream, face );
if ( error )
goto Fail;
/* set-up charmap */
{
FT_String *charset_registry, *charset_encoding;
FT_Face root = FT_FACE(face);
FT_Bool unicode_charmap = 0;
charset_registry = face->charset_registry;
charset_encoding = face->charset_encoding;
if ( ( charset_registry != NULL ) &&
( charset_encoding != NULL ) )
{
if ( !strcmp( face->charset_registry, "ISO10646" ) ||
( !strcmp( face->charset_registry, "ISO8859" ) &&
!strcmp( face->charset_encoding, "1" ) ) )
unicode_charmap = 1;
}
#ifdef FT_CONFIG_OPTION_USE_CMAPS
{
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( &pcf_cmap_class, NULL, &charmap, NULL );
}
#else /* !FT_CONFIG_OPTION_USE_CMAPS */
/* XXX: charmaps. For now, report unicode for Unicode and Latin 1 */
root->charmaps = &face->charmap_handle;
root->num_charmaps = 1;
face->charmap.encoding = ft_encoding_none;
face->charmap.platform_id = 0;
face->charmap.encoding_id = 0;
if ( unicode_charmap )
{
face->charmap.encoding = ft_encoding_unicode;
face->charmap.platform_id = 3;
face->charmap.encoding_id = 1;
}
face->charmap.face = root;
face->charmap_handle = &face->charmap;
root->charmap = face->charmap_handle;
#endif /* !FT_CONFIG_OPTION_USE_CMAPS */
}
Exit:
return error;
Fail:
FT_TRACE2(( "[not a valid PCF file]\n" ));
error = PCF_Err_Unknown_File_Format; /* error */
goto Exit;
}
static FT_Error
PCF_Set_Pixel_Size( FT_Size size )
{
PCF_Face face = (PCF_Face)FT_SIZE_FACE( size );
FT_TRACE4(( "rec %d - pres %d\n", size->metrics.y_ppem,
face->root.available_sizes->height ));
if ( size->metrics.y_ppem == face->root.available_sizes->height )
{
size->metrics.ascender = face->accel.fontAscent << 6;
size->metrics.descender = face->accel.fontDescent * (-64);
#if 0
size->metrics.height = face->accel.maxbounds.ascent << 6;
#endif
size->metrics.height = size->metrics.ascender -
size->metrics.descender;
size->metrics.max_advance = face->accel.maxbounds.characterWidth << 6;
return PCF_Err_Ok;
}
else
{
FT_TRACE4(( "size WRONG\n" ));
return PCF_Err_Invalid_Pixel_Size;
}
}
static FT_Error
PCF_Glyph_Load( FT_GlyphSlot slot,
FT_Size size,
FT_UInt glyph_index,
FT_Int load_flags )
{
PCF_Face face = (PCF_Face)FT_SIZE_FACE( size );
FT_Stream stream = face->root.stream;
FT_Error error = PCF_Err_Ok;
FT_Memory memory = FT_FACE(face)->memory;
FT_Bitmap* bitmap = &slot->bitmap;
PCF_Metric metric;
int bytes;
FT_UNUSED( load_flags );
FT_TRACE4(( "load_glyph %d ---", glyph_index ));
if ( !face )
{
error = PCF_Err_Invalid_Argument;
goto Exit;
}
metric = face->metrics + glyph_index;
bitmap->rows = metric->ascent + metric->descent;
bitmap->width = metric->rightSideBearing - metric->leftSideBearing;
bitmap->num_grays = 1;
bitmap->pixel_mode = ft_pixel_mode_mono;
FT_TRACE6(( "BIT_ORDER %d ; BYTE_ORDER %d ; GLYPH_PAD %d\n",
PCF_BIT_ORDER( face->bitmapsFormat ),
PCF_BYTE_ORDER( face->bitmapsFormat ),
PCF_GLYPH_PAD( face->bitmapsFormat ) ));
switch ( PCF_GLYPH_PAD( face->bitmapsFormat ) )
{
case 1:
bitmap->pitch = ( bitmap->width + 7 ) >> 3;
break;
case 2:
bitmap->pitch = ( ( bitmap->width + 15 ) >> 4 ) << 1;
break;
case 4:
bitmap->pitch = ( ( bitmap->width + 31 ) >> 5 ) << 2;
break;
case 8:
bitmap->pitch = ( ( bitmap->width + 63 ) >> 6 ) << 3;
break;
default:
return PCF_Err_Invalid_File_Format;
}
/* XXX: to do: are there cases that need repadding the bitmap? */
bytes = bitmap->pitch * bitmap->rows;
if ( FT_ALLOC( bitmap->buffer, bytes ) )
goto Exit;
if ( FT_STREAM_SEEK( metric->bits ) ||
FT_STREAM_READ( bitmap->buffer, bytes ) )
goto Exit;
if ( PCF_BIT_ORDER( face->bitmapsFormat ) != MSBFirst )
BitOrderInvert( bitmap->buffer,bytes );
if ( ( PCF_BYTE_ORDER( face->bitmapsFormat ) !=
PCF_BIT_ORDER( face->bitmapsFormat ) ) )
{
switch ( PCF_SCAN_UNIT( face->bitmapsFormat ) )
{
case 1:
break;
case 2:
TwoByteSwap( bitmap->buffer, bytes );
break;
case 4:
FourByteSwap( bitmap->buffer, bytes );
break;
}
}
slot->bitmap_left = metric->leftSideBearing;
slot->bitmap_top = metric->ascent;
slot->metrics.horiAdvance = metric->characterWidth << 6 ;
slot->metrics.horiBearingX = metric->rightSideBearing << 6 ;
slot->metrics.horiBearingY = metric->ascent << 6 ;
slot->metrics.width = metric->characterWidth << 6 ;
slot->metrics.height = bitmap->rows << 6;
slot->linearHoriAdvance = (FT_Fixed)bitmap->width << 16;
slot->format = ft_glyph_format_bitmap;
slot->flags = FT_GLYPH_OWN_BITMAP;
FT_TRACE4(( " --- ok\n" ));
Exit:
return error;
}
FT_CALLBACK_TABLE_DEF
const FT_Driver_ClassRec pcf_driver_class =
{
{
ft_module_font_driver,
sizeof ( FT_DriverRec ),
"pcf",
0x10000L,
0x20000L,
0,
(FT_Module_Constructor)0,
(FT_Module_Destructor) 0,
(FT_Module_Requester) 0
},
sizeof( PCF_FaceRec ),
sizeof( FT_SizeRec ),
sizeof( FT_GlyphSlotRec ),
(FT_Face_InitFunc) PCF_Face_Init,
(FT_Face_DoneFunc) PCF_Face_Done,
(FT_Size_InitFunc) 0,
(FT_Size_DoneFunc) 0,
(FT_Slot_InitFunc)0,
(FT_Slot_DoneFunc)0,
(FT_Size_ResetPointsFunc) PCF_Set_Pixel_Size,
(FT_Size_ResetPixelsFunc) PCF_Set_Pixel_Size,
(FT_Slot_LoadFunc) PCF_Glyph_Load,
#ifndef FT_CONFIG_OPTION_USE_CMAPS
(FT_CharMap_CharIndexFunc) PCF_Char_Get_Index,
#else
(FT_CharMap_CharNextFunc) 0,
#endif
(FT_Face_GetKerningFunc) 0,
(FT_Face_AttachFunc) 0,
(FT_Face_GetAdvancesFunc) 0,
#ifndef FT_CONFIG_OPTION_USE_CMAPS
(FT_CharMap_CharNextFunc) PCF_Char_Get_Next,
#else
(FT_CharMap_CharNextFunc) 0
#endif
};
#ifdef FT_CONFIG_OPTION_DYNAMIC_DRIVERS
/*************************************************************************/
/* */
/* <Function> */
/* getDriverClass */
/* */
/* <Description> */
/* This function is used when compiling the TrueType driver as a */
/* shared library (`.DLL' or `.so'). It will be used by the */
/* high-level library of FreeType to retrieve the address of the */
/* driver's generic interface. */
/* */
/* It shouldn't be implemented in a static build, as each driver must */
/* have the same function as an exported entry point. */
/* */
/* <Return> */
/* The address of the TrueType's driver generic interface. The */
/* format-specific interface can then be retrieved through the method */
/* interface->get_format_interface. */
/* */
FT_EXPORT_DEF( const FT_Driver_Class )
getDriverClass( void )
{
return &pcf_driver_class;
}
#endif /* FT_CONFIG_OPTION_DYNAMIC_DRIVERS */
/* END */