ref: cd92b11dc630b67d0ae630e03469e656abd86c19
dir: /src/pcf/pcfdriver.c/
/* pcfdriver.c
FreeType font driver for pcf files
Copyright (C) 2000 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_ERRORS_H
#include FT_INTERNAL_DEBUG_H
#include FT_INTERNAL_STREAM_H
#include FT_INTERNAL_OBJECTS_H
#include FT_SOURCE_FILE(pcf,pcf.h)
#include FT_SOURCE_FILE(pcf,pcfdriver.h)
#include FT_SOURCE_FILE(pcf,pcfutil.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_pcfdriver
static
FT_Error PCF_Done_Face( PCF_Face face )
{
FT_Memory memory = FT_FACE_MEMORY( face );
PCF_Property tmp = face->properties;
int i;
FREE( face->encodings );
FREE( face->metrics );
for ( i = 0; i < face->nprops; i++ )
{
FREE( tmp->name );
if ( tmp->isString )
FREE( tmp->value );
}
FREE( face->properties );
FT_TRACE4(( "DONE_FACE!!!\n" ));
return FT_Err_Ok;
}
static
FT_Error PCF_Init_Face( FT_Stream stream,
PCF_Face face,
FT_Int face_index,
FT_Int num_params,
FT_Parameter* params )
{
FT_Error error = FT_Err_Ok;
FT_UNUSED( num_params );
FT_UNUSED( params );
FT_UNUSED( face_index );
error = pcf_load_font( stream, face );
if ( error )
goto Fail;
return FT_Err_Ok;
Fail:
FT_TRACE2(( "[not a valid PCF file]\n" ));
PCF_Done_Face( face );
return FT_Err_Unknown_File_Format; /* error */
}
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;
return FT_Err_Ok;
}
else
{
FT_TRACE4(( "size WRONG\n" ));
return FT_Err_Invalid_Pixel_Size;
}
}
static
FT_Error PCF_Load_Glyph( FT_GlyphSlot slot,
FT_Size size,
FT_UInt glyph_index,
FT_Int load_flags )
{
PCF_Face face = (PCF_Face)FT_SIZE_FACE( size );
FT_Error error = FT_Err_Ok;
FT_Memory memory = FT_FACE(face)->memory;
FT_Bitmap* bitmap = &slot->bitmap;
PCF_Metric metric;
int bytes;
FT_Stream stream = face->root.stream;
FT_UNUSED( load_flags );
FT_TRACE4(( "load_glyph %d ---", glyph_index ));
if ( !face )
{
error = FT_Err_Invalid_Argument;
goto Exit;
}
metric = face->metrics + glyph_index;
bitmap->rows = metric->ascent + metric->descent;
bitmap->width = metric->characterWidth;
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 FT_Err_Invalid_File_Format;
}
/* XXX: to do: are there cases that need repadding the bitmap? */
bytes = bitmap->pitch * bitmap->rows;
if ( ALLOC( bitmap->buffer, bytes ) )
goto Exit;
if ( FILE_Seek( metric->bits ) ||
FILE_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 = 0;
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;
}
static
FT_UInt PCF_Get_Char_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 face->defaultChar;
}
FT_CALLBACK_TABLE_DEF
const FT_Driver_Class 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 ),
(FTDriver_initFace) PCF_Init_Face,
(FTDriver_doneFace) PCF_Done_Face,
(FTDriver_initSize) 0,
(FTDriver_doneSize) 0,
(FTDriver_initGlyphSlot)0,
(FTDriver_doneGlyphSlot)0,
(FTDriver_setCharSizes) PCF_Set_Pixel_Size,
(FTDriver_setPixelSizes)PCF_Set_Pixel_Size,
(FTDriver_loadGlyph) PCF_Load_Glyph,
(FTDriver_getCharIndex) PCF_Get_Char_Index,
(FTDriver_getKerning) 0,
(FTDriver_attachFile) 0,
(FTDriver_getAdvances) 0
};
#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 */