misc/libfreetype/src/base/ftlcdfil.c
changeset 9372 915436ff64ab
parent 9371 f3840de881bd
child 9373 b769a8e38cbd
--- a/misc/libfreetype/src/base/ftlcdfil.c	Thu Jul 25 23:16:06 2013 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,376 +0,0 @@
-/***************************************************************************/
-/*                                                                         */
-/*  ftlcdfil.c                                                             */
-/*                                                                         */
-/*    FreeType API for color filtering of subpixel bitmap glyphs (body).   */
-/*                                                                         */
-/*  Copyright 2006, 2008, 2009, 2010 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_LCD_FILTER_H
-#include FT_IMAGE_H
-#include FT_INTERNAL_OBJECTS_H
-
-
-#ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
-
-/* define USE_LEGACY to implement the legacy filter */
-#define  USE_LEGACY
-
-  /* FIR filter used by the default and light filters */
-  static void
-  _ft_lcd_filter_fir( FT_Bitmap*      bitmap,
-                      FT_Render_Mode  mode,
-                      FT_Library      library )
-  {
-    FT_Byte*  weights = library->lcd_weights;
-    FT_UInt   width   = (FT_UInt)bitmap->width;
-    FT_UInt   height  = (FT_UInt)bitmap->rows;
-
-
-    /* horizontal in-place FIR filter */
-    if ( mode == FT_RENDER_MODE_LCD && width >= 4 )
-    {
-      FT_Byte*  line = bitmap->buffer;
-
-
-      for ( ; height > 0; height--, line += bitmap->pitch )
-      {
-        FT_UInt  fir[5];
-        FT_UInt  val1, xx;
-
-
-        val1   = line[0];
-        fir[0] = weights[2] * val1;
-        fir[1] = weights[3] * val1;
-        fir[2] = weights[4] * val1;
-        fir[3] = 0;
-        fir[4] = 0;
-
-        val1    = line[1];
-        fir[0] += weights[1] * val1;
-        fir[1] += weights[2] * val1;
-        fir[2] += weights[3] * val1;
-        fir[3] += weights[4] * val1;
-
-        for ( xx = 2; xx < width; xx++ )
-        {
-          FT_UInt  val, pix;
-
-
-          val    = line[xx];
-          pix    = fir[0] + weights[0] * val;
-          fir[0] = fir[1] + weights[1] * val;
-          fir[1] = fir[2] + weights[2] * val;
-          fir[2] = fir[3] + weights[3] * val;
-          fir[3] =          weights[4] * val;
-
-          pix        >>= 8;
-          pix         |= -( pix >> 8 );
-          line[xx - 2] = (FT_Byte)pix;
-        }
-
-        {
-          FT_UInt  pix;
-
-
-          pix          = fir[0] >> 8;
-          pix         |= -( pix >> 8 );
-          line[xx - 2] = (FT_Byte)pix;
-
-          pix          = fir[1] >> 8;
-          pix         |= -( pix >> 8 );
-          line[xx - 1] = (FT_Byte)pix;
-        }
-      }
-    }
-
-    /* vertical in-place FIR filter */
-    else if ( mode == FT_RENDER_MODE_LCD_V && height >= 4 )
-    {
-      FT_Byte*  column = bitmap->buffer;
-      FT_Int    pitch  = bitmap->pitch;
-
-
-      for ( ; width > 0; width--, column++ )
-      {
-        FT_Byte*  col = column;
-        FT_UInt   fir[5];
-        FT_UInt   val1, yy;
-
-
-        val1   = col[0];
-        fir[0] = weights[2] * val1;
-        fir[1] = weights[3] * val1;
-        fir[2] = weights[4] * val1;
-        fir[3] = 0;
-        fir[4] = 0;
-        col   += pitch;
-
-        val1    = col[0];
-        fir[0] += weights[1] * val1;
-        fir[1] += weights[2] * val1;
-        fir[2] += weights[3] * val1;
-        fir[3] += weights[4] * val1;
-        col    += pitch;
-
-        for ( yy = 2; yy < height; yy++ )
-        {
-          FT_UInt  val, pix;
-
-
-          val    = col[0];
-          pix    = fir[0] + weights[0] * val;
-          fir[0] = fir[1] + weights[1] * val;
-          fir[1] = fir[2] + weights[2] * val;
-          fir[2] = fir[3] + weights[3] * val;
-          fir[3] =          weights[4] * val;
-
-          pix           >>= 8;
-          pix            |= -( pix >> 8 );
-          col[-2 * pitch] = (FT_Byte)pix;
-          col            += pitch;
-        }
-
-        {
-          FT_UInt  pix;
-
-
-          pix             = fir[0] >> 8;
-          pix            |= -( pix >> 8 );
-          col[-2 * pitch] = (FT_Byte)pix;
-
-          pix         = fir[1] >> 8;
-          pix        |= -( pix >> 8 );
-          col[-pitch] = (FT_Byte)pix;
-        }
-      }
-    }
-  }
-
-
-#ifdef USE_LEGACY
-
-  /* intra-pixel filter used by the legacy filter */
-  static void
-  _ft_lcd_filter_legacy( FT_Bitmap*      bitmap,
-                         FT_Render_Mode  mode,
-                         FT_Library      library )
-  {
-    FT_UInt  width  = (FT_UInt)bitmap->width;
-    FT_UInt  height = (FT_UInt)bitmap->rows;
-    FT_Int   pitch  = bitmap->pitch;
-
-    static const int  filters[3][3] =
-    {
-      { 65538 * 9/13, 65538 * 1/6, 65538 * 1/13 },
-      { 65538 * 3/13, 65538 * 4/6, 65538 * 3/13 },
-      { 65538 * 1/13, 65538 * 1/6, 65538 * 9/13 }
-    };
-
-    FT_UNUSED( library );
-
-
-    /* horizontal in-place intra-pixel filter */
-    if ( mode == FT_RENDER_MODE_LCD && width >= 3 )
-    {
-      FT_Byte*  line = bitmap->buffer;
-
-
-      for ( ; height > 0; height--, line += pitch )
-      {
-        FT_UInt  xx;
-
-
-        for ( xx = 0; xx < width; xx += 3 )
-        {
-          FT_UInt  r = 0;
-          FT_UInt  g = 0;
-          FT_UInt  b = 0;
-          FT_UInt  p;
-
-
-          p  = line[xx];
-          r += filters[0][0] * p;
-          g += filters[0][1] * p;
-          b += filters[0][2] * p;
-
-          p  = line[xx + 1];
-          r += filters[1][0] * p;
-          g += filters[1][1] * p;
-          b += filters[1][2] * p;
-
-          p  = line[xx + 2];
-          r += filters[2][0] * p;
-          g += filters[2][1] * p;
-          b += filters[2][2] * p;
-
-          line[xx]     = (FT_Byte)( r / 65536 );
-          line[xx + 1] = (FT_Byte)( g / 65536 );
-          line[xx + 2] = (FT_Byte)( b / 65536 );
-        }
-      }
-    }
-    else if ( mode == FT_RENDER_MODE_LCD_V && height >= 3 )
-    {
-      FT_Byte*  column = bitmap->buffer;
-
-
-      for ( ; width > 0; width--, column++ )
-      {
-        FT_Byte*  col     = column;
-        FT_Byte*  col_end = col + height * pitch;
-
-
-        for ( ; col < col_end; col += 3 * pitch )
-        {
-          FT_UInt  r = 0;
-          FT_UInt  g = 0;
-          FT_UInt  b = 0;
-          FT_UInt  p;
-
-
-          p  = col[0];
-          r += filters[0][0] * p;
-          g += filters[0][1] * p;
-          b += filters[0][2] * p;
-
-          p  = col[pitch];
-          r += filters[1][0] * p;
-          g += filters[1][1] * p;
-          b += filters[1][2] * p;
-
-          p  = col[pitch * 2];
-          r += filters[2][0] * p;
-          g += filters[2][1] * p;
-          b += filters[2][2] * p;
-
-          col[0]         = (FT_Byte)( r / 65536 );
-          col[pitch]     = (FT_Byte)( g / 65536 );
-          col[2 * pitch] = (FT_Byte)( b / 65536 );
-        }
-      }
-    }
-  }
-
-#endif /* USE_LEGACY */
-
-
-  FT_EXPORT_DEF( FT_Error )
-  FT_Library_SetLcdFilterWeights( FT_Library      library,
-                                  unsigned char  *weights )
-  {
-    if ( !library || !weights )
-      return FT_Err_Invalid_Argument;
-
-    ft_memcpy( library->lcd_weights, weights, 5 );
-
-    return FT_Err_Ok;
-  }
-
-
-  FT_EXPORT_DEF( FT_Error )
-  FT_Library_SetLcdFilter( FT_Library    library,
-                           FT_LcdFilter  filter )
-  {
-    static const FT_Byte  light_filter[5] =
-                            { 0x00, 0x55, 0x56, 0x55, 0x00 };
-    /* the values here sum up to a value larger than 256, */
-    /* providing a cheap gamma correction                 */
-    static const FT_Byte  default_filter[5] =
-                            { 0x10, 0x40, 0x70, 0x40, 0x10 };
-
-
-    if ( !library )
-      return FT_Err_Invalid_Argument;
-
-    switch ( filter )
-    {
-    case FT_LCD_FILTER_NONE:
-      library->lcd_filter_func = NULL;
-      library->lcd_extra       = 0;
-      break;
-
-    case FT_LCD_FILTER_DEFAULT:
-#if defined( FT_FORCE_LEGACY_LCD_FILTER )
-
-      library->lcd_filter_func = _ft_lcd_filter_legacy;
-      library->lcd_extra       = 0;
-
-#elif defined( FT_FORCE_LIGHT_LCD_FILTER )
-
-      ft_memcpy( library->lcd_weights, light_filter, 5 );
-      library->lcd_filter_func = _ft_lcd_filter_fir;
-      library->lcd_extra       = 2;
-
-#else
-
-      ft_memcpy( library->lcd_weights, default_filter, 5 );
-      library->lcd_filter_func = _ft_lcd_filter_fir;
-      library->lcd_extra       = 2;
-
-#endif
-
-      break;
-
-    case FT_LCD_FILTER_LIGHT:
-      ft_memcpy( library->lcd_weights, light_filter, 5 );
-      library->lcd_filter_func = _ft_lcd_filter_fir;
-      library->lcd_extra       = 2;
-      break;
-
-#ifdef USE_LEGACY
-
-    case FT_LCD_FILTER_LEGACY:
-      library->lcd_filter_func = _ft_lcd_filter_legacy;
-      library->lcd_extra       = 0;
-      break;
-
-#endif
-
-    default:
-      return FT_Err_Invalid_Argument;
-    }
-
-    library->lcd_filter = filter;
-
-    return FT_Err_Ok;
-  }
-
-#else /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
-
-  FT_EXPORT_DEF( FT_Error )
-  FT_Library_SetLcdFilterWeights( FT_Library      library,
-                                  unsigned char  *weights )
-  {
-    FT_UNUSED( library );
-    FT_UNUSED( weights );
-
-    return FT_Err_Unimplemented_Feature;
-  }
-
-
-  FT_EXPORT_DEF( FT_Error )
-  FT_Library_SetLcdFilter( FT_Library    library,
-                           FT_LcdFilter  filter )
-  {
-    FT_UNUSED( library );
-    FT_UNUSED( filter );
-
-    return FT_Err_Unimplemented_Feature;
-  }
-
-#endif /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
-
-
-/* END */