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/***************************************************************************/
/*                                                                         */
/*  renderer.c                                                             */
/*                                                                         */
/*    FreeType renderer module (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>


  /* initialize renderer - init its raster */
  static
  FT_Error  ft_renderer_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;
  }
  

  /* set render-specific mode */
  static
  FT_Error  ft_renderer_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_renderer_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_renderer_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_renderer_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;
    }
    
    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 = slot->face->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 */
    if ( mode & ft_render_mode_antialias )
    {
      pitch = width;
      bitmap->pixel_mode = ft_pixel_mode_grays;
      bitmap->num_grays  = 256;
    }
    else
    {
      pitch = ( width + 7 ) >> 3;
      bitmap->pixel_mode = ft_pixel_mode_mono;
    }

    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  = 0;

    if ( bitmap->pixel_mode == ft_pixel_mode_grays )
      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;
  }


#ifndef  FT_CONFIG_OPTION_NO_STD_RASTER


#include <ftraster.h>


  const FT_Renderer_Class  ft_standard_renderer_class =
  {
    {
      ft_module_renderer,
      sizeof ( FT_RendererRec ),
      
      "standard renderer",
      0x10000L,
      0x20000L,
      
      0,    /* module specific interface */
      
      (FT_Module_Constructor)ft_renderer_init,
      (FT_Module_Destructor) 0,
      (FT_Module_Requester)  0
    },
    
    ft_glyph_format_outline,
    
    (FTRenderer_render)   ft_renderer_render,
    (FTRenderer_transform)ft_renderer_transform,
    (FTRenderer_getCBox)  ft_renderer_get_cbox,
    (FTRenderer_setMode)  ft_renderer_set_mode,
    
    (FT_Raster_Funcs*)    &ft_standard_raster
  };
  

#endif /* !FT_CONFIG_OPTION_NO_STD_RASTER */


#ifndef FT_CONFIG_OPTION_NO_SMOOTH_RASTER


#include <ftgrays.h>


  const FT_Renderer_Class  ft_smooth_renderer_class =
  {
    {
      ft_module_renderer,
      sizeof ( FT_RendererRec ),
      
      "smooth renderer",
      0x10000L,
      0x20000L,
      
      0,    /* module specific interface */
      
      (FT_Module_Constructor)ft_renderer_init,
      (FT_Module_Destructor) 0,
      (FT_Module_Requester)  0
    },

    ft_glyph_format_outline,
    
    (FTRenderer_render)   ft_renderer_render,
    (FTRenderer_transform)ft_renderer_transform,
    (FTRenderer_getCBox)  ft_renderer_get_cbox,
    (FTRenderer_setMode)  ft_renderer_set_mode,
    
    (FT_Raster_Funcs*)    &ft_grays_raster
  };


#endif /* !FT_CONFIG_OPTION_NO_SMOOTH_RASTER */


/* END */
kc3-lang/freetype/src/renderer/renderer.c

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src/renderer/renderer.c
