freetype2/src/dense/ftdenserend.c

  /** The 'dense' renderer */

#include <freetype/ftoutln.h>
#include <freetype/internal/ftdebug.h>
#include <freetype/internal/ftobjs.h>
#include "ftdenserend.h"
#include "ftdense.h"

#include "ftdenseerrs.h"

  /**************************************************************************
   *
   * 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 dense



  /**************************************************************************
   *
   * interface functions
   *
   */

  /* set render specific modes or attributes */
  static FT_Error
  ft_dense_set_mode( FT_Renderer render, FT_ULong mode_tag, FT_Pointer data )
  {
    /* pass it to the rasterizer */
    return render->clazz->raster_class->raster_set_mode( render->raster, mode_tag,
                                                         data );
  }

  /* transform the glyph using matrix and/or delta */
  static FT_Error
  ft_dense_transform( FT_Renderer      render,
                      FT_GlyphSlot     slot,
                      const FT_Matrix* matrix,
                      const FT_Vector* delta )
  {

    FT_Error error = FT_Err_Ok;

    if ( slot->format != render->glyph_format )
    {
      error = FT_THROW( 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 control box of a glyph's outline */
  static void
  ft_dense_get_cbox( FT_Renderer render, FT_GlyphSlot slot, FT_BBox* cbox )
  {

    FT_ZERO( cbox );

    if ( slot->format == render->glyph_format )
      FT_Outline_Get_CBox( &slot->outline, cbox );
  }

  static FT_Error
  ft_dense_init( FT_Renderer render )
  {
    return FT_Err_Ok;
  }

  static void
  ft_dense_done( FT_Renderer render )
  {
    FT_UNUSED( render );
  }

  /* generate bitmap from a glyph's slot image */
  static FT_Error
  ft_dense_render( FT_Renderer      render,
                   FT_GlyphSlot     slot,
                   FT_Render_Mode   mode,
                   const FT_Vector* origin )
  {
    FT_Error    error   = FT_Err_Ok;
    FT_Outline* outline = &slot->outline;
    FT_Bitmap*  bitmap  = &slot->bitmap;

    /* FT_FREE and FT_ALLOC_MULT macros need a variable named 'memory' */
    FT_Memory   memory  = render->root.memory;

    FT_Pos x_shift = 0;
    FT_Pos y_shift = 0;

    FT_Raster_Params params;

    /* check whether slot format is correct before rendering */
    if ( slot->format != render->glyph_format )
    {
      error = FT_THROW( Invalid_Glyph_Format );
      goto Exit;
    }

    /* check mode */
    if ( mode != FT_RENDER_MODE_NORMAL &&
         mode != FT_RENDER_MODE_LIGHT  &&
         mode != FT_RENDER_MODE_LCD    &&
         mode != FT_RENDER_MODE_LCD_V  )
    {
      error = FT_THROW( Cannot_Render_Glyph );
      goto Exit;
    }


    /* deallocate the previously allocated bitmap */
    if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP )
    {
      FT_FREE( bitmap->buffer );
      slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
    }

    /* preset the bitmap using the glyph's outline */
    if ( ft_glyphslot_preset_bitmap( slot, mode, origin ) )
    {
      error = FT_THROW( Raster_Overflow );
      goto Exit;
    }

    if ( !bitmap->rows || !bitmap->pitch )
      goto Exit;


    /* allocate new one */
    // ARM NEON crashes if memory is not aligned
    if ( FT_ALLOC_MULT( bitmap->buffer, 1,bitmap->rows*bitmap->pitch + 16 ) )
      goto Exit;

    slot->internal->flags |= FT_GLYPH_OWN_BITMAP;

    /* Calculate shift in 26.6 format */
    x_shift = 64 * -slot->bitmap_left;
    y_shift = 64 * -slot->bitmap_top;

    if ( bitmap->pixel_mode == FT_PIXEL_MODE_LCD_V )
       y_shift += 64 * (FT_Int)bitmap->rows / 3;
     else
       y_shift += 64 * (FT_Int)bitmap->rows;


    if ( origin )
    {
      x_shift += origin->x;
      y_shift += origin->y;
    }

    /* translate outline to render it into the bitmap */
    if ( (x_shift || y_shift) && !slot->prel_shifted){
      //FT_Outline_Translate( outline, x_shift, y_shift );
      FT_PreLine pl = slot->prelines;
      while (pl!=NULL)
      {
        pl->x1 += x_shift;
        pl->y1 += y_shift;
        pl->x2 += x_shift;
        pl->y2 += y_shift;

        pl = pl->next;
      }
      slot->prel_shifted = 1;
    }

    /* set up parameters */
    params.target = bitmap;
    params.source = outline;
    params.prelines = slot->prelines;

    /* render the outline */
    error =
        render->raster_render( render->raster, (const FT_Raster_Params*)&params );

  Exit:
    if ( !error )
    {
      /* the glyph is successfully rendered to a bitmap */
      slot->format = FT_GLYPH_FORMAT_BITMAP;
    }
    else if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP )
    {
      FT_FREE( bitmap->buffer );
      slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
    }

    // if ( x_shift || y_shift )
    //   FT_Outline_Translate( outline, -x_shift, -y_shift );

    return error;
  }


  FT_DEFINE_RENDERER(
      ft_dense_renderer_class,

      FT_MODULE_RENDERER,
      sizeof( FT_RendererRec ),

      "dense",
      0x10000L,
      0x20000L,

      NULL,

      (FT_Module_Constructor)ft_dense_init,
      (FT_Module_Destructor)ft_dense_done,
      (FT_Module_Requester)NULL,

      FT_GLYPH_FORMAT_OUTLINE,

      (FT_Renderer_RenderFunc)ft_dense_render,       /* render_glyph    */
      (FT_Renderer_TransformFunc)ft_dense_transform, /* transform_glyph */
      (FT_Renderer_GetCBoxFunc)ft_dense_get_cbox,    /* get_glyph_cbox  */
      (FT_Renderer_SetModeFunc)ft_dense_set_mode,    /* set_mode        */

      (FT_Raster_Funcs*)&ft_dense_raster /* raster_class    */
  )

  /* END */