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

• /***************************************************************************/
  /*                                                                         */
  /*  ftsmooth.c                                                             */
  /*                                                                         */
  /*    Anti-aliasing renderer interface (body).                             */
  /*                                                                         */
  /*  Copyright 2000-2001, 2002 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 <ft2build.h>
  #include FT_INTERNAL_OBJECTS_H
  #include FT_OUTLINE_H
  #include "ftsmooth.h"
  #include "ftgrays.h"
  
  #include "ftsmerrs.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 = Smooth_Err_Ok;
  
  
      if ( slot->format != render->glyph_format )
      {
        error = Smooth_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 )
    {
      FT_MEM_ZERO( cbox, 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_generic( FT_Renderer   render,
                              FT_GlyphSlot  slot,
                              FT_UInt       mode,
                              FT_Vector*    origin,
                              FT_UInt       required_mode,
                              FT_Int        hmul,
                              FT_Int        vmul )
    {
      FT_Error     error;
      FT_Outline*  outline = NULL;
      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 = Smooth_Err_Invalid_Argument;
        goto Exit;
      }
  
      /* check mode */
      if ( mode != required_mode )
        return Smooth_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 )
      {
        FT_FREE( bitmap->buffer );
        slot->flags &= ~FT_GLYPH_OWN_BITMAP;
      }
  
      /* allocate new one, depends on pixel format */
      pitch = width;
      if ( hmul )
      {
        width = width*hmul;
        pitch = ( width + 3 ) & -4;
      }
  
      if ( vmul )
        height *= vmul;
  
      bitmap->pixel_mode = FT_PIXEL_MODE_GRAY;
      bitmap->num_grays  = 256;
      bitmap->width      = width;
      bitmap->rows       = height;
      bitmap->pitch      = pitch;
  
      if ( FT_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;
  
      /* implode outline if needed */
      {
        FT_Int      n;
        FT_Vector*  vec;
  
        if ( hmul )
          for ( vec = outline->points, n = 0; n < outline->n_points; n++, vec++ )
            vec->x *= hmul;
  
        if ( vmul )
          for ( vec = outline->points, n = 0; n < outline->n_points; n++, vec++ )
            vec->y *= vmul;
      }
  
      /* render outline into the bitmap */
      error = render->raster_render( render->raster, &params );
  
      /* deflate outline if needed */
      {
        FT_Int      n;
        FT_Vector*  vec;
  
        if ( hmul )
          for ( vec = outline->points, n = 0; n < outline->n_points; n++, vec++ )
            vec->x /= hmul;
  
        if ( vmul )
          for ( vec = outline->points, n = 0; n < outline->n_points; n++, vec++ )
            vec->y /= vmul;
      }
  
  
      FT_Outline_Translate( outline, cbox.xMin, cbox.yMin );
  
      if ( error )
        goto Exit;
  
      slot->format      = FT_GLYPH_FORMAT_BITMAP;
      slot->bitmap_left = cbox.xMin >> 6;
      slot->bitmap_top  = cbox.yMax >> 6;
  
    Exit:
      if ( outline && origin )
        FT_Outline_Translate( outline, -origin->x, -origin->y );
  
      return error;
    }
  
  
  
    /* 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 )
    {
      return ft_smooth_render_generic( render, slot, mode, origin,
                                       FT_RENDER_MODE_NORMAL,
                                       0, 0 );
    }
  
  
    /* convert a slot's glyph image into a horizontal LCD bitmap */
    static FT_Error
    ft_smooth_render_lcd( FT_Renderer   render,
                          FT_GlyphSlot  slot,
                          FT_UInt       mode,
                          FT_Vector*    origin )
    {
      return ft_smooth_render_generic( render, slot, mode, origin,
                                       FT_RENDER_MODE_LCD,
                                       3, 0 );
    }
  
  
    /* convert a slot's glyph image into a vertical LCD bitmap */
    static FT_Error
    ft_smooth_render_lcd_v( FT_Renderer   render,
                            FT_GlyphSlot  slot,
                            FT_UInt       mode,
                            FT_Vector*    origin )
    {
      return ft_smooth_render_generic( render, slot, mode, origin,
                                       FT_RENDER_MODE_LCD_V,
                                       0, 3 );
    }
  
  
  
    FT_CALLBACK_TABLE_DEF
    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,
  
      (FT_Renderer_RenderFunc)   ft_smooth_render,
      (FT_Renderer_TransformFunc)ft_smooth_transform,
      (FT_Renderer_GetCBoxFunc)  ft_smooth_get_cbox,
      (FT_Renderer_SetModeFunc)  ft_smooth_set_mode,
  
      (FT_Raster_Funcs*)    &ft_grays_raster
    };
  
  
    FT_CALLBACK_TABLE_DEF
    const FT_Renderer_Class  ft_smooth_lcd_renderer_class =
    {
      {
        ft_module_renderer,
        sizeof( FT_RendererRec ),
  
        "smooth-lcd",
        0x10000L,
        0x20000L,
  
        0,    /* module specific interface */
  
        (FT_Module_Constructor)ft_smooth_init,
        (FT_Module_Destructor) 0,
        (FT_Module_Requester)  0
      },
  
      FT_GLYPH_FORMAT_OUTLINE,
  
      (FT_Renderer_RenderFunc)   ft_smooth_render_lcd,
      (FT_Renderer_TransformFunc)ft_smooth_transform,
      (FT_Renderer_GetCBoxFunc)  ft_smooth_get_cbox,
      (FT_Renderer_SetModeFunc)  ft_smooth_set_mode,
  
      (FT_Raster_Funcs*)    &ft_grays_raster
    };
  
  
  
    FT_CALLBACK_TABLE_DEF
    const FT_Renderer_Class  ft_smooth_lcdv_renderer_class =
    {
      {
        ft_module_renderer,
        sizeof( FT_RendererRec ),
  
        "smooth-lcdv",
        0x10000L,
        0x20000L,
  
        0,    /* module specific interface */
  
        (FT_Module_Constructor)ft_smooth_init,
        (FT_Module_Destructor) 0,
        (FT_Module_Requester)  0
      },
  
      FT_GLYPH_FORMAT_OUTLINE,
  
      (FT_Renderer_RenderFunc)   ft_smooth_render_lcd_v,
      (FT_Renderer_TransformFunc)ft_smooth_transform,
      (FT_Renderer_GetCBoxFunc)  ft_smooth_get_cbox,
      (FT_Renderer_SetModeFunc)  ft_smooth_set_mode,
  
      (FT_Raster_Funcs*)    &ft_grays_raster
    };
  
  
  /* END */
  

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