kc3-lang/freetype/src/smooth/ftsmooth.c

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• Hash : fbeb41d9
  Author :
  Date : 2000-07-02T00:27:53
  

  Formatting. Adding copyright notices. Removing an unnecessary file (smooth.h).

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• src/smooth/ftsmooth.c

• /***************************************************************************/
  /*                                                                         */
  /*  ftsmooth.c                                                             */
  /*                                                                         */
  /*    Anti-aliasing renderer interface (body).                             */
  /*                                                                         */
  /*  Copyright 2000 by                                                      */
  /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
  /*                                                                         */
  /*  This file is part of the FreeType project, and may only be used,       */
  /*  modified, and distributed under the terms of the FreeType project      */
  /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
  /*  this file you indicate that you have read the license and              */
  /*  understand and accept it fully.                                        */
  /*                                                                         */
  /***************************************************************************/
  
  
  #include <freetype/internal/ftobjs.h>
  #include <freetype/ftoutln.h>
  #include <ftsmooth.h>
  #include <ftgrays.h>
  
  
    /* initialize renderer -- init its raster */
    static
    FT_Error  ft_smooth_init( FT_Renderer  render )
    {
      FT_Library  library = FT_MODULE_LIBRARY( render );
      
  
      render->clazz->raster_class->raster_reset( render->raster,
                                                 library->raster_pool,
                                                 library->raster_pool_size );
  
      return 0;
    }
    
  
    /* sets render-specific mode */
    static
    FT_Error  ft_smooth_set_mode( FT_Renderer  render,
                                  FT_ULong     mode_tag,
                                  FT_Pointer   data )
    {
      /* we simply pass it to the raster */
      return render->clazz->raster_class->raster_set_mode( render->raster,
                                                           mode_tag,
                                                           data );
    }                                          
  
    /* transform a given glyph image */
    static
    FT_Error  ft_smooth_transform( FT_Renderer   render,
                                   FT_GlyphSlot  slot,
                                   FT_Matrix*    matrix,
                                   FT_Vector*    delta )
    {
      FT_Error  error = FT_Err_Ok;
      
  
      if ( slot->format != render->glyph_format )
      {
        error = FT_Err_Invalid_Argument;
        goto Exit;
      }
      
      if ( matrix )
        FT_Outline_Transform( &slot->outline, matrix );
        
      if ( delta )
        FT_Outline_Translate( &slot->outline, delta->x, delta->y );
      
    Exit:
      return error;
    }
  
  
    /* return the glyph's control box */
    static
    void  ft_smooth_get_cbox( FT_Renderer   render,
                              FT_GlyphSlot  slot,
                              FT_BBox*      cbox )
    {
      MEM_Set( cbox, 0, sizeof ( *cbox ) );
  
      if ( slot->format == render->glyph_format )
        FT_Outline_Get_CBox( &slot->outline, cbox );
    }                                      
    
  
    /* convert a slot's glyph image into a bitmap */
    static
    FT_Error  ft_smooth_render( FT_Renderer   render,
                                FT_GlyphSlot  slot,
                                FT_UInt       mode,
                                FT_Vector*    origin )
    {
      FT_Error     error;
      FT_Outline*  outline;
      FT_BBox      cbox;
      FT_UInt      width, height, pitch;
      FT_Bitmap*   bitmap;
      FT_Memory    memory;
      
      FT_Raster_Params  params;
      
  
      /* check glyph image format */
      if ( slot->format != render->glyph_format )
      {
        error = FT_Err_Invalid_Argument;
        goto Exit;
      }
      
      /* check mode */
      if ( mode != ft_render_mode_normal )
        return FT_Err_Cannot_Render_Glyph;
        
      outline = &slot->outline;
      
      /* translate the outline to the new origin if needed */
      if ( origin )
        FT_Outline_Translate( outline, origin->x, origin->y );
      
      /* compute the control box, and grid fit it */
      FT_Outline_Get_CBox( outline, &cbox );
      
      cbox.xMin &= -64;
      cbox.yMin &= -64;
      cbox.xMax  = ( cbox.xMax + 63 ) & -64;
      cbox.yMax  = ( cbox.yMax + 63 ) & -64;
  
      width  = ( cbox.xMax - cbox.xMin ) >> 6;
      height = ( cbox.yMax - cbox.yMin ) >> 6;
      bitmap = &slot->bitmap;
      memory = render->root.memory;
      
      /* release old bitmap buffer */
      if ( slot->flags & ft_glyph_own_bitmap )
      {
        FREE( bitmap->buffer );
        slot->flags &= ~ft_glyph_own_bitmap;
      }
        
      /* allocate new one, depends on pixel format */
      pitch = width;
      bitmap->pixel_mode = ft_pixel_mode_grays;
      bitmap->num_grays  = 256;
      bitmap->width      = width;
      bitmap->rows       = height;
      bitmap->pitch      = pitch;
      
      if ( ALLOC( bitmap->buffer, (FT_ULong)pitch * height ) )
        goto Exit;
  
      slot->flags |= ft_glyph_own_bitmap;
      
      /* translate outline to render it into the bitmap */
      FT_Outline_Translate( outline, -cbox.xMin, -cbox.yMin );
  
      /* set up parameters */
      params.target = bitmap;
      params.source = outline;
      params.flags  = ft_raster_flag_aa;
  
      /* render outline into the bitmap */
      error = render->raster_render( render->raster, &params );
      if ( error )
        goto Exit;
      
      slot->format      = ft_glyph_format_bitmap;
      slot->bitmap_left = cbox.xMin >> 6;
      slot->bitmap_top  = cbox.yMax >> 6;
  
    Exit:
      return error;
    }
  
  
    const FT_Renderer_Class  ft_smooth_renderer_class =
    {
      {
        ft_module_renderer,
        sizeof( FT_RendererRec ),
        
        "smooth",
        0x10000L,
        0x20000L,
        
        0,    /* module specific interface */
        
        (FT_Module_Constructor)ft_smooth_init,
        (FT_Module_Destructor) 0,
        (FT_Module_Requester)  0
      },
  
      ft_glyph_format_outline,
      
      (FTRenderer_render)   ft_smooth_render,
      (FTRenderer_transform)ft_smooth_transform,
      (FTRenderer_getCBox)  ft_smooth_get_cbox,
      (FTRenderer_setMode)  ft_smooth_set_mode,
      
      (FT_Raster_Funcs*)    &ft_grays_raster
    };
  
  
  /* END */
  

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