C++ FT_MulFix函数代码示例

/*
 * Class:     FreetypeFont
 * Method:    loadGlyph0
 * Signature: (JI)V
 */
JNIEXPORT void JNICALL Java_sage_FreetypeFont_loadGlyph0
  (JNIEnv *env, jobject jo, jlong fontPtr, jint glyphCode)
{
	//FT_Face face = (FT_Face) facePtr;
	FTDataStruct* fontData = (FTDataStruct*)(intptr_t) fontPtr;
	FT_Activate_Size(fontData->sizePtr);
	int error = FT_Load_Glyph(fontData->facePtr, glyphCode, FT_LOAD_FORCE_AUTOHINT);
	if ((fontData->style & FT_STYLE_FLAG_BOLD) != 0)
	{
		// Apply bold effect
		if (fontData->facePtr->glyph->format == FT_GLYPH_FORMAT_OUTLINE)
		{
			/* some reasonable strength */
			FT_Pos strength = FT_MulFix(fontData->facePtr->units_per_EM,
				fontData->facePtr->size->metrics.y_scale ) / 42;

			FT_BBox bbox_before, bbox_after;
			// The bounding box code was what XBMC was using to do this calculation; but the
			// examples in the freetype library use the *4 math below which then doesn't clip
			// the text when we render it.
//			FT_Outline_Get_CBox(&fontData->facePtr->glyph->outline, &bbox_before);
			FT_Outline_Embolden(&fontData->facePtr->glyph->outline, strength);  // ignore error
//			FT_Outline_Get_CBox(&fontData->facePtr->glyph->outline, &bbox_after);

//			FT_Pos dx = bbox_after.xMax - bbox_before.xMax;
//			FT_Pos dy = bbox_after.yMax - bbox_before.yMax;
FT_Pos dx = strength * 4;
FT_Pos dy = dx;
			if (fontData->facePtr->glyph->advance.x)
				fontData->facePtr->glyph->advance.x += dx;

			if (fontData->facePtr->glyph->advance.y)
				fontData->facePtr->glyph->advance.y += dy;

			fontData->facePtr->glyph->metrics.width        += dx;
			fontData->facePtr->glyph->metrics.height       += dy;
			fontData->facePtr->glyph->metrics.horiBearingY += dy;
			fontData->facePtr->glyph->metrics.horiAdvance  += dx;
			fontData->facePtr->glyph->metrics.vertBearingX -= dx / 2;
			fontData->facePtr->glyph->metrics.vertBearingY += dy;
			fontData->facePtr->glyph->metrics.vertAdvance  += dy;
		}
	}
	if ((fontData->style & FT_STYLE_FLAG_ITALIC) != 0)
	{
		// Apply italics effect
		if (fontData->facePtr->glyph->format == FT_GLYPH_FORMAT_OUTLINE)
		{
			/* For italic, simply apply a shear transform, with an angle */
			/* of about 12 degrees.                                      */

			FT_Matrix    transform;
			transform.xx = 0x10000L;
			transform.yx = 0x00000L;

			transform.xy = 0x06000L;
			transform.yy = 0x10000L;

			FT_BBox bbox_before, bbox_after;
			FT_Outline_Get_CBox(&fontData->facePtr->glyph->outline, &bbox_before);
			FT_Outline_Transform(&fontData->facePtr->glyph->outline, &transform);
			FT_Outline_Get_CBox(&fontData->facePtr->glyph->outline, &bbox_after);

			FT_Pos dx = bbox_after.xMax - bbox_before.xMax;
			FT_Pos dy = bbox_after.yMax - bbox_before.yMax;

			fontData->facePtr->glyph->metrics.width        += dx;
			fontData->facePtr->glyph->metrics.height       += dy;
		}
	}
}

// aScale is intended for a 16.16 x/y_scale of an FT_Size_Metrics
static inline FT_Long
ScaleRoundDesignUnits(FT_Short aDesignMetric, FT_Fixed aScale)
{
    FT_Long fixed26dot6 = FT_MulFix(aDesignMetric, aScale);
    return ROUND_26_6_TO_INT(fixed26dot6);
}

//.........这里部分代码省略.........
    pfrslot->format     = FT_GLYPH_FORMAT_OUTLINE;
    outline->n_points   = 0;
    outline->n_contours = 0;
    gps_offset          = face->header.gps_section_offset;

    /* load the glyph outline (FT_LOAD_NO_RECURSE isn't supported) */
    error = pfr_glyph_load( &slot->glyph, face->root.stream,
                            gps_offset, gchar->gps_offset, gchar->gps_size );

    if ( !error )
    {
      FT_BBox            cbox;
      FT_Glyph_Metrics*  metrics = &pfrslot->metrics;
      FT_Pos             advance;
      FT_Int             em_metrics, em_outline;
      FT_Bool            scaling;


      scaling = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE ) == 0 );

      /* copy outline data */
      *outline = slot->glyph.loader->base.outline;

      outline->flags &= ~FT_OUTLINE_OWNER;
      outline->flags |= FT_OUTLINE_REVERSE_FILL;

      if ( size && pfrsize->metrics.y_ppem < 24 )
        outline->flags |= FT_OUTLINE_HIGH_PRECISION;

      /* compute the advance vector */
      metrics->horiAdvance = 0;
      metrics->vertAdvance = 0;

      advance    = gchar->advance;
      em_metrics = face->phy_font.metrics_resolution;
      em_outline = face->phy_font.outline_resolution;

      if ( em_metrics != em_outline )
        advance = FT_MulDiv( advance, em_outline, em_metrics );

      if ( face->phy_font.flags & PFR_PHY_VERTICAL )
        metrics->vertAdvance = advance;
      else
        metrics->horiAdvance = advance;

      pfrslot->linearHoriAdvance = metrics->horiAdvance;
      pfrslot->linearVertAdvance = metrics->vertAdvance;

      /* make-up vertical metrics(?) */
      metrics->vertBearingX = 0;
      metrics->vertBearingY = 0;

      /* Apply the font matrix, if any.                 */
      /* TODO: Test existing fonts with unusual matrix  */
      /* whether we have to adjust Units per EM.        */
      {
        FT_Matrix font_matrix;


        font_matrix.xx = face->log_font.matrix[0] << 8;
        font_matrix.yx = face->log_font.matrix[1] << 8;
        font_matrix.xy = face->log_font.matrix[2] << 8;
        font_matrix.yy = face->log_font.matrix[3] << 8;

        FT_Outline_Transform( outline, &font_matrix );
      }

      /* scale when needed */
      if ( scaling )
      {
        FT_Int      n;
        FT_Fixed    x_scale = pfrsize->metrics.x_scale;
        FT_Fixed    y_scale = pfrsize->metrics.y_scale;
        FT_Vector*  vec     = outline->points;


        /* scale outline points */
        for ( n = 0; n < outline->n_points; n++, vec++ )
        {
          vec->x = FT_MulFix( vec->x, x_scale );
          vec->y = FT_MulFix( vec->y, y_scale );
        }

        /* scale the advance */
        metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
        metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
      }

      /* compute the rest of the metrics */
      FT_Outline_Get_CBox( outline, &cbox );

      metrics->width        = cbox.xMax - cbox.xMin;
      metrics->height       = cbox.yMax - cbox.yMin;
      metrics->horiBearingX = cbox.xMin;
      metrics->horiBearingY = cbox.yMax - metrics->height;
    }

  Exit:
    return error;
  }

  pfr_slot_load( PFR_Slot  slot,
                 PFR_Size  size,
                 FT_UInt   gindex,
                 FT_Int32  load_flags )
  {
    FT_Error     error;
    PFR_Face     face    = (PFR_Face)slot->root.face;
    PFR_Char     gchar;
    FT_Outline*  outline = &slot->root.outline;
    FT_ULong     gps_offset;

    if (gindex > 0)
      gindex--;

    /* check that the glyph index is correct */
    FT_ASSERT( gindex < face->phy_font.num_chars );

    /* try to load an embedded bitmap */
    if ( ( load_flags & ( FT_LOAD_NO_SCALE | FT_LOAD_NO_BITMAP ) ) == 0 )
    {
      error = pfr_slot_load_bitmap( slot, size, gindex );
      if ( error == 0 )
        goto Exit;
    }

    gchar               = face->phy_font.chars + gindex;
    slot->root.format   = FT_GLYPH_FORMAT_OUTLINE;
    outline->n_points   = 0;
    outline->n_contours = 0;
    gps_offset          = face->header.gps_section_offset;

    /* load the glyph outline (FT_LOAD_NO_RECURSE isn't supported) */
    error = pfr_glyph_load( &slot->glyph, face->root.stream,
                            gps_offset, gchar->gps_offset, gchar->gps_size );

    if ( !error )
    {
      FT_BBox            cbox;
      FT_Glyph_Metrics*  metrics = &slot->root.metrics;
      FT_Pos             advance;
      FT_Int             em_metrics, em_outline;
      FT_Bool            scaling;


      scaling = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE ) == 0 );

      /* copy outline data */
      *outline = slot->glyph.loader->base.outline;

      outline->flags &= ~FT_OUTLINE_OWNER;
      outline->flags |= FT_OUTLINE_REVERSE_FILL;

      if ( size && size->root.metrics.y_ppem < 24 )
        outline->flags |= FT_OUTLINE_HIGH_PRECISION;

      /* compute the advance vector */
      metrics->horiAdvance = 0;
      metrics->vertAdvance = 0;

      advance    = gchar->advance;
      em_metrics = face->phy_font.metrics_resolution;
      em_outline = face->phy_font.outline_resolution;

      if ( em_metrics != em_outline )
        advance = FT_MulDiv( advance, em_outline, em_metrics );

      if ( face->phy_font.flags & PFR_PHY_VERTICAL )
        metrics->vertAdvance = advance;
      else
        metrics->horiAdvance = advance;

      slot->root.linearHoriAdvance = metrics->horiAdvance;
      slot->root.linearVertAdvance = metrics->vertAdvance;

      /* make-up vertical metrics(?) */
      metrics->vertBearingX = 0;
      metrics->vertBearingY = 0;

      /* scale when needed */
      if ( scaling )
      {
        FT_Int      n;
        FT_Fixed    x_scale = size->root.metrics.x_scale;
        FT_Fixed    y_scale = size->root.metrics.y_scale;
        FT_Vector*  vec     = outline->points;


        /* scale outline points */
        for ( n = 0; n < outline->n_points; n++, vec++ )
        {
          vec->x = FT_MulFix( vec->x, x_scale );
          vec->y = FT_MulFix( vec->y, y_scale );
        }

        /* scale the advance */
        metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
        metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
      }

      /* compute the rest of the metrics */
//.........这里部分代码省略.........

  static void
  af_warper_compute_line_best( AF_Warper     warper,
                               FT_Fixed      scale,
                               FT_Pos        delta,
                               FT_Pos        xx1,
                               FT_Pos        xx2,
                               AF_WarpScore  base_distort,
                               AF_Segment    segments,
                               FT_UInt       num_segments )
  {
    FT_Int        idx_min, idx_max, idx0;
    FT_UInt       nn;
    AF_WarpScore  scores[65];


    for ( nn = 0; nn < 65; nn++ )
      scores[nn] = 0;

    idx0 = xx1 - warper->t1;

    /* compute minimum and maximum indices */
    {
      FT_Pos  xx1min = warper->x1min;
      FT_Pos  xx1max = warper->x1max;
      FT_Pos  w      = xx2 - xx1;


      if ( xx1min + w < warper->x2min )
        xx1min = warper->x2min - w;

      xx1max = warper->x1max;
      if ( xx1max + w > warper->x2max )
        xx1max = warper->x2max - w;

      idx_min = xx1min - warper->t1;
      idx_max = xx1max - warper->t1;

      if ( idx_min < 0 || idx_min > idx_max || idx_max > 64 )
      {
        FT_TRACE5(( "invalid indices:\n"
                    "  min=%d max=%d, xx1=%ld xx2=%ld,\n"
                    "  x1min=%ld x1max=%ld, x2min=%ld x2max=%ld\n",
                    idx_min, idx_max, xx1, xx2,
                    warper->x1min, warper->x1max,
                    warper->x2min, warper->x2max ));
        return;
      }
    }

    for ( nn = 0; nn < num_segments; nn++ )
    {
      FT_Pos  len = segments[nn].max_coord - segments[nn].min_coord;
      FT_Pos  y0  = FT_MulFix( segments[nn].pos, scale ) + delta;
      FT_Pos  y   = y0 + ( idx_min - idx0 );
      FT_Int  idx;


      /* score the length of the segments for the given range */
      for ( idx = idx_min; idx <= idx_max; idx++, y++ )
        scores[idx] += af_warper_weights[y & 63] * len;
    }

    /* find best score */
    {
      FT_Int  idx;


      for ( idx = idx_min; idx <= idx_max; idx++ )
      {
        AF_WarpScore  score = scores[idx];
        AF_WarpScore  distort = base_distort + ( idx - idx0 );


        if ( score > warper->best_score         ||
             ( score == warper->best_score    &&
               distort < warper->best_distort ) )
        {
          warper->best_score   = score;
          warper->best_distort = distort;
          warper->best_scale   = scale;
          warper->best_delta   = delta + ( idx - idx0 );
        }
      }
    }
  }

  static FT_Error
  af_loader_embolden_glyph_in_slot( AF_Loader        loader,
                                    FT_Face          face,
                                    AF_StyleMetrics  style_metrics )
  {
    FT_Error  error = FT_Err_Ok;

    FT_GlyphSlot           slot    = face->glyph;
    AF_FaceGlobals         globals = loader->globals;
    AF_WritingSystemClass  writing_system_class;

    FT_Size_Metrics*  size_metrics = &face->size->internal->autohint_metrics;

    FT_Pos  stdVW = 0;
    FT_Pos  stdHW = 0;

    FT_Bool  size_changed = size_metrics->x_ppem !=
                              globals->stem_darkening_for_ppem;

    FT_Fixed  em_size  = af_intToFixed( face->units_per_EM );
    FT_Fixed  em_ratio = FT_DivFix( af_intToFixed( 1000 ), em_size );

    FT_Matrix  scale_down_matrix = { 0x10000L, 0, 0, 0x10000L };


    /* Skip stem darkening for broken fonts. */
    if ( !face->units_per_EM )
    {
      error = FT_ERR( Corrupted_Font_Header );
      goto Exit;
    }

    /*
     * We depend on the writing system (script analyzers) to supply
     * standard widths for the script of the glyph we are looking at.  If
     * it can't deliver, stem darkening is disabled.
     */
    writing_system_class =
      af_writing_system_classes[style_metrics->style_class->writing_system];

    if ( writing_system_class->style_metrics_getstdw )
      writing_system_class->style_metrics_getstdw( style_metrics,
                                                   &stdHW,
                                                   &stdVW );
    else
    {
      error = FT_ERR( Unimplemented_Feature );
      goto Exit;
    }

    if ( size_changed                                               ||
         ( stdVW > 0 && stdVW != globals->standard_vertical_width ) )
    {
      FT_Fixed  darken_by_font_units_x, darken_x;


      darken_by_font_units_x =
        af_intToFixed( af_loader_compute_darkening( loader,
                                                    face,
                                                    stdVW ) );
      darken_x = FT_DivFix( FT_MulFix( darken_by_font_units_x,
                                       size_metrics->x_scale ),
                            em_ratio );

      globals->standard_vertical_width = stdVW;
      globals->stem_darkening_for_ppem = size_metrics->x_ppem;
      globals->darken_x                = af_fixedToInt( darken_x );
    }

    if ( size_changed                                                 ||
         ( stdHW > 0 && stdHW != globals->standard_horizontal_width ) )
    {
      FT_Fixed  darken_by_font_units_y, darken_y;


      darken_by_font_units_y =
        af_intToFixed( af_loader_compute_darkening( loader,
                                                    face,
                                                    stdHW ) );
      darken_y = FT_DivFix( FT_MulFix( darken_by_font_units_y,
                                       size_metrics->y_scale ),
                            em_ratio );

      globals->standard_horizontal_width = stdHW;
      globals->stem_darkening_for_ppem   = size_metrics->x_ppem;
      globals->darken_y                  = af_fixedToInt( darken_y );

      /*
       * Scale outlines down on the Y-axis to keep them inside their blue
       * zones.  The stronger the emboldening, the stronger the downscaling
       * (plus heuristical padding to prevent outlines still falling out
       * their zones due to rounding).
       *
       * Reason: `FT_Outline_Embolden' works by shifting the rightmost
       * points of stems farther to the right, and topmost points farther
       * up.  This positions points on the Y-axis outside their
       * pre-computed blue zones and leads to distortion when applying the
       * hints in the code further below.  Code outside this emboldening
       * block doesn't know we are presenting it with modified outlines the
       * analyzer didn't see!
//.........这里部分代码省略.........

tt_size_reset( TT_Size  size )
{
    TT_Face           face;
    FT_Error          error = FT_Err_Ok;
    FT_Size_Metrics*  metrics;


    size->ttmetrics.valid = FALSE;

    face = (TT_Face)size->root.face;

    metrics = &size->metrics;

    /* copy the result from base layer */
    *metrics = size->root.metrics;

    if ( metrics->x_ppem < 1 || metrics->y_ppem < 1 )
        return FT_THROW( Invalid_PPem );

    /* This bit flag, if set, indicates that the ppems must be       */
    /* rounded to integers.  Nearly all TrueType fonts have this bit */
    /* set, as hinting won't work really well otherwise.             */
    /*                                                               */
    if ( face->header.Flags & 8 )
    {
        metrics->x_scale = FT_DivFix( metrics->x_ppem << 6,
                                      face->root.units_per_EM );
        metrics->y_scale = FT_DivFix( metrics->y_ppem << 6,
                                      face->root.units_per_EM );

        metrics->ascender =
            FT_PIX_ROUND( FT_MulFix( face->root.ascender, metrics->y_scale ) );
        metrics->descender =
            FT_PIX_ROUND( FT_MulFix( face->root.descender, metrics->y_scale ) );
        metrics->height =
            FT_PIX_ROUND( FT_MulFix( face->root.height, metrics->y_scale ) );
        metrics->max_advance =
            FT_PIX_ROUND( FT_MulFix( face->root.max_advance_width,
                                     metrics->x_scale ) );
    }

    /* compute new transformation */
    if ( metrics->x_ppem >= metrics->y_ppem )
    {
        size->ttmetrics.scale   = metrics->x_scale;
        size->ttmetrics.ppem    = metrics->x_ppem;
        size->ttmetrics.x_ratio = 0x10000L;
        size->ttmetrics.y_ratio = FT_DivFix( metrics->y_ppem,
                                             metrics->x_ppem );
    }
    else
    {
        size->ttmetrics.scale   = metrics->y_scale;
        size->ttmetrics.ppem    = metrics->y_ppem;
        size->ttmetrics.x_ratio = FT_DivFix( metrics->x_ppem,
                                             metrics->y_ppem );
        size->ttmetrics.y_ratio = 0x10000L;
    }

#ifdef TT_USE_BYTECODE_INTERPRETER
    size->cvt_ready = -1;
#endif /* TT_USE_BYTECODE_INTERPRETER */

    if ( !error )
        size->ttmetrics.valid = TRUE;

    return error;
}

int PG_Font::GetFontHeight() {
	return my_internaldata->FaceCache ?
		FT_CEIL(FT_MulFix(my_internaldata->FaceCache->Face->height, my_internaldata->FaceCache->Face->size->metrics.y_scale)) : 0;
}

  tt_size_reset( TT_Size  size )
  {
    TT_Face           face;
    FT_Error          error = TT_Err_Ok;
    FT_Size_Metrics*  metrics;


    size->ttmetrics.valid = FALSE;

    face = (TT_Face)size->root.face;

    metrics = &size->metrics;

    /* copy the result from base layer */
    *metrics = size->root.metrics;

    if ( metrics->x_ppem < 1 || metrics->y_ppem < 1 )
      return TT_Err_Invalid_PPem;

    /* This bit flag, if set, indicates that the ppems must be       */
    /* rounded to integers.  Nearly all TrueType fonts have this bit */
    /* set, as hinting won't work really well otherwise.             */
    /*                                                               */
    if ( face->header.Flags & 8 )
    {
      metrics->x_scale = FT_DivFix( metrics->x_ppem << 6,
                                    face->root.units_per_EM );
      metrics->y_scale = FT_DivFix( metrics->y_ppem << 6,
                                    face->root.units_per_EM );

      metrics->ascender =
        FT_PIX_ROUND( FT_MulFix( face->root.ascender, metrics->y_scale ) );
      metrics->descender =
        FT_PIX_ROUND( FT_MulFix( face->root.descender, metrics->y_scale ) );
      metrics->height =
        FT_PIX_ROUND( FT_MulFix( face->root.height, metrics->y_scale ) );
      metrics->max_advance =
        FT_PIX_ROUND( FT_MulFix( face->root.max_advance_width,
                                 metrics->x_scale ) );
    }

    /* compute new transformation */
    if ( metrics->x_ppem >= metrics->y_ppem )
    {
      size->ttmetrics.scale   = metrics->x_scale;
      size->ttmetrics.ppem    = metrics->x_ppem;
      size->ttmetrics.x_ratio = 0x10000L;
      size->ttmetrics.y_ratio = FT_MulDiv( metrics->y_ppem,
                                           0x10000L,
                                           metrics->x_ppem );
    }
    else
    {
      size->ttmetrics.scale   = metrics->y_scale;
      size->ttmetrics.ppem    = metrics->y_ppem;
      size->ttmetrics.x_ratio = FT_MulDiv( metrics->x_ppem,
                                           0x10000L,
                                           metrics->y_ppem );
      size->ttmetrics.y_ratio = 0x10000L;
    }


#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER

    {
      FT_UInt  i;


      /* Scale the cvt values to the new ppem.          */
      /* We use by default the y ppem to scale the CVT. */
      for ( i = 0; i < size->cvt_size; i++ )
        size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale );

      /* All twilight points are originally zero */
      for ( i = 0; i < (FT_UInt)size->twilight.n_points; i++ )
      {
        size->twilight.org[i].x = 0;
        size->twilight.org[i].y = 0;
        size->twilight.cur[i].x = 0;
        size->twilight.cur[i].y = 0;
      }

      /* clear storage area */
      for ( i = 0; i < (FT_UInt)size->storage_size; i++ )
        size->storage[i] = 0;

      size->GS = tt_default_graphics_state;

      error = tt_size_run_prep( size );
    }

#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */

    if ( !error )
      size->ttmetrics.valid = TRUE;

    return error;
  }

bool Font::insertGlyph(Char character) {
	
	if(!m_size) {
		insertPlaceholderGlyph(character);
		return false;
	}
	
	FT_UInt glyphIndex = FT_Get_Char_Index(m_size->face, character);
	if(!glyphIndex) {
		insertPlaceholderGlyph(character);
		return false;
	}
	
	FT_Int32 flags = FT_LOAD_TARGET_LIGHT;
	if(m_info.weight != 0) {
		flags |= FT_LOAD_FORCE_AUTOHINT;
	}
	if(FT_Load_Glyph(m_size->face, glyphIndex, flags)) {
		insertPlaceholderGlyph(character);
		return false;
	}
	
	FT_GlyphSlot ftGlyph = m_size->face->glyph;
	
	if(m_info.weight != 0 && ftGlyph->format == FT_GLYPH_FORMAT_OUTLINE) {
		FT_Pos strength = FT_MulFix(m_size->face->units_per_EM, m_size->metrics.y_scale) / 24 * m_info.weight / 4;
		FT_Outline_Embolden(&ftGlyph->outline, strength);
	}
	
	if(FT_Render_Glyph(ftGlyph, FT_RENDER_MODE_NORMAL)) {
		insertPlaceholderGlyph(character);
		return false;
	}
	
	// Fill in info for this glyph.
	Glyph & glyph = m_glyphs[character];
	glyph.index = glyphIndex;
	glyph.size.x = ftGlyph->bitmap.width;
	glyph.size.y = ftGlyph->bitmap.rows;
	glyph.advance.x = float(ftGlyph->linearHoriAdvance) / 65536.f;
	glyph.advance.y = float(ftGlyph->linearVertAdvance) / 65536.f;
	glyph.lsb_delta = ftGlyph->lsb_delta;
	glyph.rsb_delta = ftGlyph->rsb_delta;
	glyph.draw_offset.x = ftGlyph->bitmap_left;
	glyph.draw_offset.y = ftGlyph->bitmap_top - ftGlyph->bitmap.rows;
	glyph.uv_start = Vec2f(0.f);
	glyph.uv_end = Vec2f(0.f);
	glyph.texture = 0;
	
	// Some glyphs like spaces have a size of 0...
	if(glyph.size.x != 0 && glyph.size.y != 0) {
		
		Image imgGlyph;
		imgGlyph.create(size_t(glyph.size.x), size_t(glyph.size.y), Image::Format_A8);
		
		FT_Bitmap & srcBitmap = ftGlyph->bitmap;
		arx_assert(srcBitmap.pitch >= 0);
		arx_assert(unsigned(srcBitmap.pitch) == unsigned(srcBitmap.width));
		
		// Copy pixels
		unsigned char * src = srcBitmap.buffer;
		unsigned char * dst = imgGlyph.getData();
		memcpy(dst, src, glyph.size.x * glyph.size.y);
		
		Vec2i offset;
		if(!m_textures->insertImage(imgGlyph, glyph.texture, offset)) {
			LogWarning << "Could not upload glyph for character U+" << std::hex << character
			           << " (" << util::encode<util::UTF8>(character) << ") in font "
			           << m_info.name;
			insertPlaceholderGlyph(character);
			return false;
		}
		
		// Compute UV mapping for each glyph.
		const float textureSize = float(m_textures->getTextureSize());
		glyph.uv_start = Vec2f(offset) / Vec2f(textureSize);
		glyph.uv_end = Vec2f(offset + glyph.size) / Vec2f(textureSize);
		
	}
	
	return true;
}

//.........这里部分代码省略.........
      /* advance width                                           */
      if ( load_flags & FT_LOAD_NO_RECURSE )
      {
        FT_Slot_Internal  internal = glyph->root.internal;


        glyph->root.metrics.horiBearingX = decoder.builder.left_bearing.x;
        glyph->root.metrics.horiAdvance  = decoder.builder.advance.x;

        internal->glyph_matrix         = font_matrix;
        internal->glyph_delta          = font_offset;
        internal->glyph_transformed    = 1;
      }
      else
      {
        FT_BBox            cbox;
        FT_Glyph_Metrics*  metrics = &glyph->root.metrics;


        /* copy the _unscaled_ advance width */
        metrics->horiAdvance          = decoder.builder.advance.x;
        glyph->root.linearHoriAdvance = decoder.builder.advance.x;
        glyph->root.internal->glyph_transformed = 0;

        /* make up vertical metrics */
        metrics->vertBearingX = 0;
        metrics->vertBearingY = 0;
        metrics->vertAdvance  = 0;

        glyph->root.linearVertAdvance = 0;
        glyph->root.format = ft_glyph_format_outline;

        if ( size && size->root.metrics.y_ppem < 24 )
          glyph->root.outline.flags |= ft_outline_high_precision;

        /* apply the font matrix */
        FT_Outline_Transform( &glyph->root.outline, &font_matrix );

        FT_Outline_Translate( &glyph->root.outline,
                              font_offset.x,
                              font_offset.y );

        if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 )
        {
          /* scale the outline and the metrics */
          FT_Int       n;
          FT_Outline*  cur = decoder.builder.base;
          FT_Vector*   vec = cur->points;
          FT_Fixed     x_scale = glyph->x_scale;
          FT_Fixed     y_scale = glyph->y_scale;


          /* First of all, scale the points */
          if ( !hinting )
            for ( n = cur->n_points; n > 0; n--, vec++ )
            {
              vec->x = FT_MulFix( vec->x, x_scale );
              vec->y = FT_MulFix( vec->y, y_scale );
            }

          FT_Outline_Get_CBox( &glyph->root.outline, &cbox );

          /* Then scale the metrics */
          metrics->horiAdvance  = FT_MulFix( metrics->horiAdvance,  x_scale );
          metrics->vertAdvance  = FT_MulFix( metrics->vertAdvance,  y_scale );

          metrics->vertBearingX = FT_MulFix( metrics->vertBearingX, x_scale );
          metrics->vertBearingY = FT_MulFix( metrics->vertBearingY, y_scale );

          if ( hinting )
          {
            metrics->horiAdvance = ( metrics->horiAdvance + 32 ) & -64;
            metrics->vertAdvance = ( metrics->vertAdvance + 32 ) & -64;

            metrics->vertBearingX = ( metrics->vertBearingX + 32 ) & -64;
            metrics->vertBearingY = ( metrics->vertBearingY + 32 ) & -64;
          }
        }

        /* compute the other metrics */
        FT_Outline_Get_CBox( &glyph->root.outline, &cbox );

        /* grid fit the bounding box if necessary */
        if ( hinting )
        {
          cbox.xMin &= -64;
          cbox.yMin &= -64;
          cbox.xMax  = ( cbox.xMax + 63 ) & -64;
          cbox.yMax  = ( cbox.yMax + 63 ) & -64;
        }

        metrics->width  = cbox.xMax - cbox.xMin;
        metrics->height = cbox.yMax - cbox.yMin;

        metrics->horiBearingX = cbox.xMin;
        metrics->horiBearingY = cbox.yMax;
      }
    }
    return error;
  }

  af_warper_compute( AF_Warper      warper,
                     AF_GlyphHints  hints,
                     AF_Dimension   dim,
                     FT_Fixed      *a_scale,
                     FT_Pos        *a_delta )
  {
    AF_AxisHints  axis;
    AF_Point      points;

    FT_Fixed      org_scale;
    FT_Pos        org_delta;

    FT_UInt       nn, num_points, num_segments;
    FT_Int        X1, X2;
    FT_Int        w;

    AF_WarpScore  base_distort;
    AF_Segment    segments;


    /* get original scaling transformation */
    if ( dim == AF_DIMENSION_VERT )
    {
      org_scale = hints->y_scale;
      org_delta = hints->y_delta;
    }
    else
    {
      org_scale = hints->x_scale;
      org_delta = hints->x_delta;
    }

    warper->best_scale   = org_scale;
    warper->best_delta   = org_delta;
    warper->best_score   = 0;
    warper->best_distort = 0;

    axis         = &hints->axis[dim];
    segments     = axis->segments;
    num_segments = axis->num_segments;
    points       = hints->points;
    num_points   = hints->num_points;

    *a_scale = org_scale;
    *a_delta = org_delta;

    /* get X1 and X2, minimum and maximum in original coordinates */
    if ( axis->num_segments < 1 )
      return;

#if 1
    X1 = X2 = points[0].fx;
    for ( nn = 1; nn < num_points; nn++ )
    {
      FT_Int  X = points[nn].fx;


      if ( X < X1 )
        X1 = X;
      if ( X > X2 )
        X2 = X;
    }
#else
    X1 = X2 = segments[0].pos;
    for ( nn = 1; nn < num_segments; nn++ )
    {
      FT_Int  X = segments[nn].pos;


      if ( X < X1 )
        X1 = X;
      if ( X > X2 )
        X2 = X;
    }
#endif

    if ( X1 >= X2 )
      return;

    warper->x1 = FT_MulFix( X1, org_scale ) + org_delta;
    warper->x2 = FT_MulFix( X2, org_scale ) + org_delta;

    warper->t1 = AF_WARPER_FLOOR( warper->x1 );
    warper->t2 = AF_WARPER_CEIL( warper->x2 );

    warper->x1min = warper->x1 & ~31;
    warper->x1max = warper->x1min + 32;
    warper->x2min = warper->x2 & ~31;
    warper->x2max = warper->x2min + 32;

    if ( warper->x1max > warper->x2 )
      warper->x1max = warper->x2;

    if ( warper->x2min < warper->x1 )
      warper->x2min = warper->x1;

    warper->w0 = warper->x2 - warper->x1;

    if ( warper->w0 <= 64 )
    {
//.........这里部分代码省略.........

//.........这里部分代码省略.........
            {
              FT_ERROR(( "t1_decoder_parse_charstrings: " ));
              FT_ERROR(( "incorrect number of mm arguments\n" ));
              goto Syntax_Error;
            }

            top -= blend->num_designs * num_points;
            if ( top < decoder->stack )
              goto Stack_Underflow;

            /* we want to compute:                                   */
            /*                                                       */
            /*  a0*w0 + a1*w1 + ... + ak*wk                          */
            /*                                                       */
            /* but we only have the a0, a1-a0, a2-a0, .. ak-a0       */
            /* however, given that w0 + w1 + ... + wk == 1, we can   */
            /* rewrite it easily as:                                 */
            /*                                                       */
            /*  a0 + (a1-a0)*w1 + (a2-a0)*w2 + .. + (ak-a0)*wk       */
            /*                                                       */
            /* where k == num_designs-1                              */
            /*                                                       */
            /* I guess that's why it's written in this `compact'     */
            /* form.                                                 */
            /*                                                       */
            delta  = top + num_points;
            values = top;
            for ( nn = 0; nn < num_points; nn++ )
            {
              FT_Long  tmp = values[0];


              for ( mm = 1; mm < blend->num_designs; mm++ )
                tmp += FT_MulFix( *delta++, blend->weight_vector[mm] );

              *values++ = tmp;
            }
            /* note that `top' will be incremented later by calls to `pop' */
            break;
          }

        default:
        Unexpected_OtherSubr:
          FT_ERROR(( "t1_decoder_parse_charstrings: "
                     "invalid othersubr [%d %d]!\n", top[0], top[1] ));
          goto Syntax_Error;
        }
        decoder->top = top;
      }
      else  /* general operator */
      {
        FT_Int  num_args = t1_args_count[op];


        if ( top - decoder->stack < num_args )
          goto Stack_Underflow;

        top -= num_args;

        switch ( op )
        {
        case op_endchar:
          FT_TRACE4(( " endchar" ));

          close_contour( builder );

  af_loader_load_glyph( AF_Loader  loader,
                        AF_Module  module,
                        FT_Face    face,
                        FT_UInt    glyph_index,
                        FT_Int32   load_flags )
  {
    FT_Error  error;

    FT_Size           size          = face->size;
    FT_Size_Internal  size_internal = size->internal;
    FT_GlyphSlot      slot          = face->glyph;
    FT_Slot_Internal  slot_internal = slot->internal;
    FT_GlyphLoader    gloader       = slot_internal->loader;

    AF_GlyphHints          hints         = loader->hints;
    AF_ScalerRec           scaler;
    AF_StyleMetrics        style_metrics;
    FT_UInt                style_options = AF_STYLE_NONE_DFLT;
    AF_StyleClass          style_class;
    AF_WritingSystemClass  writing_system_class;


    if ( !size )
      return FT_THROW( Invalid_Size_Handle );

    FT_ZERO( &scaler );

    if ( !size_internal->autohint_metrics.x_scale                          ||
         size_internal->autohint_mode != FT_LOAD_TARGET_MODE( load_flags ) )
    {
      /* switching between hinting modes usually means different scaling */
      /* values; this later on enforces recomputation of everything      */
      /* related to the current size                                     */

      size_internal->autohint_mode    = FT_LOAD_TARGET_MODE( load_flags );
      size_internal->autohint_metrics = size->metrics;

#ifdef AF_CONFIG_OPTION_TT_SIZE_METRICS
      {
        FT_Size_Metrics*  size_metrics = &size_internal->autohint_metrics;


        /* set metrics to integer values and adjust scaling accordingly; */
        /* this is the same setup as with TrueType fonts, cf. function   */
        /* `tt_size_reset' in file `ttobjs.c'                            */
        size_metrics->ascender  = FT_PIX_ROUND(
                                    FT_MulFix( face->ascender,
                                               size_metrics->y_scale ) );
        size_metrics->descender = FT_PIX_ROUND(
                                    FT_MulFix( face->descender,
                                               size_metrics->y_scale ) );
        size_metrics->height    = FT_PIX_ROUND(
                                    FT_MulFix( face->height,
                                               size_metrics->y_scale ) );

        size_metrics->x_scale     = FT_DivFix( size_metrics->x_ppem << 6,
                                               face->units_per_EM );
        size_metrics->y_scale     = FT_DivFix( size_metrics->y_ppem << 6,
                                               face->units_per_EM );
        size_metrics->max_advance = FT_PIX_ROUND(
                                      FT_MulFix( face->max_advance_width,
                                                 size_metrics->x_scale ) );
      }
#endif /* AF_CONFIG_OPTION_TT_SIZE_METRICS */
    }

    /*
     * TODO: This code currently doesn't support fractional advance widths,
     * i.e., placing hinted glyphs at anything other than integer
     * x-positions.  This is only relevant for the warper code, which
     * scales and shifts glyphs to optimize blackness of stems (hinting on
     * the x-axis by nature places things on pixel integers, hinting on the
     * y-axis only, i.e., LIGHT mode, doesn't touch the x-axis).  The delta
     * values of the scaler would need to be adjusted.
     */
    scaler.face    = face;
    scaler.x_scale = size_internal->autohint_metrics.x_scale;
    scaler.x_delta = 0;
    scaler.y_scale = size_internal->autohint_metrics.y_scale;
    scaler.y_delta = 0;

    scaler.render_mode = FT_LOAD_TARGET_MODE( load_flags );
    scaler.flags       = 0;

    /* note that the fallback style can't be changed anymore */
    /* after the first call of `af_loader_load_glyph'        */
    error = af_loader_reset( loader, module, face );
    if ( error )
      goto Exit;

#ifdef FT_OPTION_AUTOFIT2
    /* XXX: undocumented hook to activate the latin2 writing system. */
    if ( load_flags & ( 1UL << 20 ) )
      style_options = AF_STYLE_LTN2_DFLT;
#endif

    /*
     * Glyphs (really code points) are assigned to scripts.  Script
     * analysis is done lazily: For each glyph that passes through here,
     * the corresponding script analyzer is called, but returns immediately
//.........这里部分代码省略.........

//.........这里部分代码省略.........
            /* _most_ at position 23.                                    */
            /*                                                           */
            /* We begin by computing `t1' as the bitwise `OR' of the     */
            /* absolute values of `a', `b', `c'.                         */

            t1  = (FT_ULong)( ( a >= 0 ) ? a : -a );
            t2  = (FT_ULong)( ( b >= 0 ) ? b : -b );
            t1 |= t2;
            t2  = (FT_ULong)( ( c >= 0 ) ? c : -c );
            t1 |= t2;

            /* Now we can be sure that the most significant bit of `t1'  */
            /* is the most significant bit of either `a', `b', or `c',   */
            /* depending on the greatest integer range of the particular */
            /* variable.                                                 */
            /*                                                           */
            /* Next, we compute the `shift', by shifting `t1' as many    */
            /* times as necessary to move its MSB to position 23.  This  */
            /* corresponds to a value of `t1' that is in the range       */
            /* 0x40_0000..0x7F_FFFF.                                     */
            /*                                                           */
            /* Finally, we shift `a', `b', and `c' by the same amount.   */
            /* This ensures that all values are now in the range         */
            /* -2^23..2^23, i.e., they are now expressed as 8.16         */
            /* fixed-float numbers.  This also means that we are using   */
            /* 24 bits of precision to compute the zeros, independently  */
            /* of the range of the original polynomial coefficients.     */
            /*                                                           */
            /* This algorithm should ensure reasonably accurate values   */
            /* for the zeros.  Note that they are only expressed with    */
            /* 16 bits when computing the extrema (the zeros need to     */
            /* be in 0..1 exclusive to be considered part of the arc).   */

            if ( t1 == 0 )  /* all coefficients are 0! */
                return;

            if ( t1 > 0x7FFFFFUL )
            {
                do
                {
                    shift++;
                    t1 >>= 1;

                } while ( t1 > 0x7FFFFFUL );

                /* this loses some bits of precision, but we use 24 of them */
                /* for the computation anyway                               */
                a >>= shift;
                b >>= shift;
                c >>= shift;
            }
            else if ( t1 < 0x400000UL )
            {
                do
                {
                    shift++;
                    t1 <<= 1;

                } while ( t1 < 0x400000UL );

                a <<= shift;
                b <<= shift;
                c <<= shift;
            }
        }

        /* handle a == 0 */
        if ( a == 0 )
        {
            if ( b != 0 )
            {
                t = - FT_DivFix( c, b ) / 2;
                test_cubic_extrema( y1, y2, y3, y4, t, min, max );
            }
        }
        else
        {
            /* solve the equation now */
            d = FT_MulFix( b, b ) - FT_MulFix( a, c );
            if ( d < 0 )
                return;

            if ( d == 0 )
            {
                /* there is a single split point at -b/a */
                t = - FT_DivFix( b, a );
                test_cubic_extrema( y1, y2, y3, y4, t, min, max );
            }
            else
            {
                /* there are two solutions; we need to filter them */
                d = FT_SqrtFixed( (FT_Int32)d );
                t = - FT_DivFix( b - d, a );
                test_cubic_extrema( y1, y2, y3, y4, t, min, max );

                t = - FT_DivFix( b + d, a );
                test_cubic_extrema( y1, y2, y3, y4, t, min, max );
            }
        }
    }