kc3-lang/freetype/src/cache/ftcsbits.c

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• Hash : 4e4a4363
  Author :
  Date : 2000-10-28T13:17:11
  

  - completed the abstract chunk cache class - started implementin a "small-bitmaps" cache derived from it - (soon a "metrics" cache will be written too)

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• src/cache/ftcsbits.c

• #include <cache/ftcsbits.h>
  
    /*************************************************************************/
    /*************************************************************************/
    /*****                                                               *****/
    /*****                    GLYPH IMAGE NODES                          *****/
    /*****                                                               *****/
    /*************************************************************************/
    /*************************************************************************/
  
  
    LOCAL_FUNC_X
    void  ftc_sbit_chunk_node_destroy( FTC_ChunkNode  node )
    {
      FTC_ChunkSet   cset   = node->cset;
      FT_Memory      memory = cset->memory;
      FT_UInt        count  = node->num_elements;
      FTC_SBit       sbit   = (FTC_SBit)node->elements;
      
      for ( ; count > 0; sbit++, count-- )
        FREE( sbit->buffer );
  
      FREE( node );
    }
  
  
    static
    FT_Error  ftc_bitmap_copy( FT_Memory   memory,
                               FT_Bitmap*  source,
                               FTC_SBit    target )
    {
      FT_Error  error;
      FT_Int    pitch = source->pitch;
      FT_ULong  size;
  
      if ( pitch < 0 )
        pitch = -pitch;
  
      size = (FT_ULong)( pitch * source->rows );
  
      if ( !ALLOC( target->buffer, size ) )
        MEM_Copy( target->buffer, source->buffer, size );
  
      return error;
    }
  
  
    LOCAL_FUNC_X
    FT_Error  ftc_sbit_chunk_node_new( FTC_ChunkSet   cset,
                                       FT_UInt        index,
                                       FTC_SBitChunk *anode )
    {
      FT_Error         error;
      FT_Memory        memory  = cset->memory;
      FTC_SBitSet      sbitset = (FTC_SBitSet)cset;
      FTC_SBitChunk    node    = 0;
      FT_Face          face;
      FT_Size          size;
  
  
      /* allocate node */
      if ( ALLOC( node, sizeof ( *node ) ) )
        goto Exit;
  
      /* init its inner fields */
      error = FTC_ChunkNode_Init( FTC_CHUNKNODE(node), cset, index, 1 );
      if (error)
        goto Exit;
  
      /* we will now load all glyph images */
      error = FTC_Manager_Lookup_Size( cset->manager,
                                       &sbitset->description.font,
                                       &face, &size );
      if ( !error )
      {
        FT_UInt  glyph_index = index * cset->chunk_size;
        FT_UInt  load_flags  = FT_LOAD_DEFAULT;
        FT_UInt  image_type  = sbitset->description.image_type;
        FT_UInt  count       = node->num_elements;
        FTC_SBit sbit        = (FTC_SBit)node->elements;
  
  
        if ( FTC_IMAGE_FORMAT( image_type ) == ftc_image_format_bitmap )
        {
          if ( image_type & ftc_image_flag_monochrome )
            load_flags |= FT_LOAD_MONOCHROME;
  
          /* disable embedded bitmaps loading if necessary */
          if ( image_type & ftc_image_flag_no_sbits )
            load_flags |= FT_LOAD_NO_BITMAP;
        }
        else if ( FTC_IMAGE_FORMAT( image_type ) == ftc_image_format_outline )
        {
          /* disable embedded bitmaps loading */
          load_flags |= FT_LOAD_NO_BITMAP;
  
          if ( image_type & ftc_image_flag_unscaled )
          {
            FT_ERROR(( "FTC_SBit_Cache: cannot load vector outlines in a"
                       " sbit cache, please check your arguments !!\n" ));
            error = FT_Err_Bad_Argument;
            goto Exit;
          }
        }
  
        /* always render glyphs to bitmaps */
        load_flags |= FT_LOAD_RENDER;
          
        if ( image_type & ftc_image_flag_unhinted )
          load_flags |= FT_LOAD_NO_HINTING;
  
        if ( image_type & ftc_image_flag_autohinted )
          load_flags |= FT_LOAD_FORCE_AUTOHINT;
  
  
        /* load a chunk of small bitmaps in a row */
        for ( ; count > 0; count--, glyph_index++ )
        {
          error = FT_Load_Glyph( face, glyph_index, load_flags );
          if (!error)
          {
            FT_Int        temp;
            FT_GlyphSlot  slot   = face->glyph;
            FT_Bitmap*    bitmap = &slot->bitmap;
            FT_Int        advance;
  
            /* check that our values fit in 8-bit containers !! */
  #define  CHECK_SCHAR(d)  ( temp = (FT_SChar)d, temp == d )
  #define  CHECK_BYTE(d)   ( temp = (FT_Byte) d, temp == d )
  
            advance = (slot->metrics.horiAdvance+32) >> 6;
            
            if ( CHECK_BYTE ( bitmap->rows  )     &&
                 CHECK_BYTE ( bitmap->width )     &&
                 CHECK_SCHAR( bitmap->pitch )     &&
                 CHECK_SCHAR( slot->bitmap_left ) &&
                 CHECK_SCHAR( slot->bitmap_top  ) &&
                 CHECK_SCHAR( advance )           )
            {
              sbit->width   = (FT_Byte) bitmap->width;
              sbit->height  = (FT_Byte) bitmap->height;
              sbit->pitch   = (FT_SChar)bitmap->pitch;
              sbit->left    = (FT_SChar)slot->bitmap_left;
              sbit->top     = (FT_SChar)slot->bitmap_top;
              sbit->advance = (FT_SChar)advance;
  
              /* grab the bitmap when possible */
              if ( slot->flags & ft_glyph_own_bitmap )
              {
                slot->flags &= ~ft_glyph_own_bitmap;
                sbit->buffer = bitmap->buffer;
              }
              else
              {
                /* copy the bitmap into a new buffer - ignore error */
                ftc_bitmap_copy( memory, bitmap, sbit );
              }
            }
          }
          else
            sbit->buffer = 0;
        }
  
        /* ignore the errors that might have occured there      */
        /* we recognize unloaded glyphs with "sbit.buffer == 0" */
        error = 0;
      }
  
    Exit:
      if ( error && node )
      {
        FREE( node->elements );
        FREE( node );
      }
  
      *anode = node;
      return error;
    }
  
  
    /* this function is important because it is both part of */
    /* a FTC_ChunkSet_Class and a FTC_CacheNode_Class     */
    /*                                                       */
    LOCAL_FUNC_X
    FT_ULong  ftc_sbit_chunk_node_size( FTC_SBitChunk  node )
    {
      FT_ULong  size  = 0;
      FT_Glyph  glyph = node->ft_glyph;
  
  
      switch ( glyph->format )
      {
      case ft_glyph_format_bitmap:
        {
          FT_BitmapGlyph  bitg;
  
  
          bitg = (FT_BitmapGlyph)glyph;
          size = bitg->bitmap.rows * labs( bitg->bitmap.pitch ) +
                 sizeof ( *bitg );
        }
        break;
  
      case ft_glyph_format_outline:
        {
          FT_OutlineGlyph  outg;
  
  
          outg = (FT_OutlineGlyph)glyph;
          size = outg->outline.n_points *
                   ( sizeof( FT_Vector ) + sizeof ( FT_Byte ) ) +
                 outg->outline.n_contours * sizeof ( FT_Short ) +
                 sizeof ( *outg );
        }
        break;
  
      default:
        ;
      }
  
      size += sizeof ( *node );
      return size;
    }
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*****                                                               *****/
    /*****                    GLYPH IMAGE QUEUES                         *****/
    /*****                                                               *****/
    /*************************************************************************/
    /*************************************************************************/
  
  
    LOCAL_FUNC_X
    FT_Error  ftc_image_set_init( FTC_ImageSet     iset,
                                  FTC_Image_Desc*  type )
    {
      iset->description = *type;
      return 0;
    }
  
  
    LOCAL_FUNC_X
    FT_Bool  ftc_image_set_compare( FTC_ImageSet     iset,
                                    FTC_Image_Desc*  type )
    {
      return !memcmp( &iset->description, type, sizeof ( *type ) );
    }
  
  
    FT_CPLUSPLUS( const FTC_ChunkSet_Class )  ftc_sbit_chunk_set_class =
    {
      sizeof( FTC_ImageSetRec ),
  
      (FTC_ChunkSet_InitFunc)       ftc_image_set_init,
      (FTC_ChunkSet_DoneFunc)       0,
      (FTC_ChunkSet_CompareFunc)    ftc_image_set_compare,
  
      (FTC_ChunkSet_NewNodeFunc)    ftc_sbit_chunk_node_new,
      (FTC_ChunkSet_SizeNodeFunc)   ftc_sbit_chunk_node_size,
      (FTC_ChunkSet_DestroyNodeFunc)ftc_sbit_chunk_node_destroy
    };
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*****                                                               *****/
    /*****                    GLYPH IMAGE CACHE                          *****/
    /*****                                                               *****/
    /*************************************************************************/
    /*************************************************************************/
  
  
    FT_CPLUSPLUS( const FTC_Glyph_Cache_Class )  ftc_sbit_chunk_cache_class =
    {
      {
        sizeof( FTC_Image_CacheRec ),
        (FTC_Cache_InitFunc) FTC_Glyph_Cache_Init,
        (FTC_Cache_DoneFunc) FTC_Glyph_Cache_Done
      },
      (FTC_ChunkSet_Class*) &ftc_sbit_chunk_set_class
    };
  
  
    FT_EXPORT_FUNC( FT_Error )  FTC_Image_Cache_New( FTC_Manager       manager,
                                                     FTC_Image_Cache*  acache )
    {
      return FTC_Manager_Register_Cache(
                manager,
                (FTC_Cache_Class*)&ftc_sbit_chunk_cache_class,
                (FTC_Cache*)acache );
    }
  
  
    FT_EXPORT_DEF( FT_Error )
    FTC_Image_Cache_Lookup( FTC_Image_Cache  cache,
                            FTC_Image_Desc*  desc,
                            FT_UInt          gindex,
                            FT_Glyph*        aglyph )
    {
      FT_Error       error;
      FTC_ChunkSet   gset;
      FTC_GlyphNode  node;
      FTC_Manager    manager;
  
      FTC_ImageSet   img_set;
  
  
      /* check for valid `desc' delayed to FT_Lru_Lookup() */
  
      if ( !cache || !aglyph )
        return FT_Err_Invalid_Argument;
  
      *aglyph  = 0;
      gset     = cache->root.last_gset;
      img_set  = (FTC_ImageSet)gset;
      if ( !gset || memcmp( &img_set->description, desc, sizeof ( *desc ) ) )
      {
        error = FT_Lru_Lookup( cache->root.gsets_lru,
                               (FT_LruKey)desc,
                               (FT_Pointer*)&gset );
        cache->root.last_gset = gset;
        if ( error )
          goto Exit;
      }
  
      error = FTC_ChunkSet_Lookup_Node( gset, gindex, &node );
      if ( error )
        goto Exit;
  
      /* now compress the manager's cache pool if needed */
      manager = cache->root.root.manager;
      if ( manager->num_bytes > manager->max_bytes )
      {
        FTC_GlyphNode_Ref   ( node );
        FTC_Manager_Compress( manager );
        FTC_GlyphNode_Unref ( node );
      }
  
      *aglyph = ((FTC_SBitChunk)node)->ft_glyph;
  
    Exit:
      return error;
    }
  
  

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