kc3-lang/freetype/src/pcf/pcfdriver.c

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• Hash : b08fe2dc
  Author :
  Date : 2002-08-27T20:20:29
  

  * massive re-formatting changes to many, many source files. I don't want to list them all here. The operations performed were all logical transformations of the sources: - trying to convert all enums and constants to CAPITALIZED_STYLE, with #define definitions like #define my_old_constants MY_NEW_CONSTANT - big, big update of the documentation comments * include/freetype/freetype.h, src/base/ftobjs.c, src/smooth/ftsmooth.c, include/freetype/ftimage.h: adding support for LCD-optimized rendering though the new constants/enums: FT_RENDER_MODE_LCD, FT_RENDER_MODE_LCD_V FT_PIXEL_MODE_LCD, FT_PIXEL_MODE_LCD_V this is still work in progress, don't expect everything to work correctly though most of the features have been implemented. * adding new FT_LOAD_XXX flags, used to specify both hinting and rendering targets: FT_LOAD_TARGET_NORMAL :: anti-aliased hinting & rendering FT_LOAD_TARGET_MONO :: monochrome bitmaps FT_LOAD_TARGET_LCD :: horizontal RGB/BGR decimated hinting & rendering FT_LOAD_TARGET_LCD_V :: vertical RGB/BGR decimated hinting & rendering note that FT_LOAD_TARGET_NORMAL is 0, which means that the default behaviour of the font engine is _unchanged_.

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• src/pcf/pcfdriver.c

• /*  pcfdriver.c
  
      FreeType font driver for pcf files
  
      Copyright (C) 2000-2001, 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 "pcf.h"
  #include "pcfdriver.h"
  #include "pcfutil.h"
  
  #include "pcferror.h"
  
  #undef  FT_COMPONENT
  #define FT_COMPONENT  trace_pcfread
  
  
    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( PCF_CMap   cmap,
                         FT_UInt32  charcode )
    {
      PCF_Encoding  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 )
    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 + 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  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
    };
  
  
    /*************************************************************************/
    /*                                                                       */
    /* 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_Bool     unicode_charmap  = 0;
  
  
        charset_registry = face->charset_registry;
        charset_encoding = face->charset_encoding;
  
        if ( ( charset_registry != NULL ) &&
             ( charset_encoding != NULL ) )
        {
          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( &pcf_cmap_class, NULL, &charmap, NULL );
  
  #if 0
          /* Select default charmap */
          if (face->root.num_charmaps)
            face->root.charmap = face->root.charmaps[0];
  #endif
        }
      }
  
    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;
      }
  
      if ( glyph_index > 0 )
        glyph_index--;
  
      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->leftSideBearing << 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,
  
      (FT_Face_GetKerningFunc)  0,
      (FT_Face_AttachFunc)      0,
      (FT_Face_GetAdvancesFunc) 0
    };
  
  
  /* END */
  

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