src/pcf/pcfdriver.c - third_party/freetype2 - Git at Google

 /*  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_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"


   /*************************************************************************/
   /*                                                                       */
   /* 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_LOCAL_DEF
   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 PCF_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 = PCF_Err_Ok;

     FT_UNUSED( num_params );
     FT_UNUSED( params );
     FT_UNUSED( face_index );


     error = pcf_load_font( stream, face );
     if ( error )
       goto Fail;

     return PCF_Err_Ok;

   Fail:
     FT_TRACE2(( "[not a valid PCF file]\n" ));
     PCF_Done_Face( face );

     return PCF_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 PCF_Err_Ok;
     }
     else
     {
       FT_TRACE4(( "size WRONG\n" ));
       return PCF_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  = PCF_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 = 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 ( 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 = 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;
   }


   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 0;
   }


   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 */
	/* 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_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"


	/*************************************************************************/
	/* */
	/* 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_LOCAL_DEF
	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 PCF_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 = PCF_Err_Ok;

	FT_UNUSED( num_params );
	FT_UNUSED( params );
	FT_UNUSED( face_index );


	error = pcf_load_font( stream, face );
	if ( error )
	goto Fail;

	return PCF_Err_Ok;

	Fail:
	FT_TRACE2(( "[not a valid PCF file]\n" ));
	PCF_Done_Face( face );

	return PCF_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 PCF_Err_Ok;
	}
	else
	{
	FT_TRACE4(( "size WRONG\n" ));
	return PCF_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 = PCF_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 = 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 ( 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 = 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;
	}


	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 0;
	}


	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 */