misc/libfreetype/src/base/ftlcdfil.c
author sheepluva
Wed, 02 May 2012 12:24:44 +0200
changeset 6991 1ec44dde5eb9
parent 5172 88f2e05288ba
permissions -rw-r--r--
make search filter field have a useable size on low frontend resolution
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/***************************************************************************/
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/*                                                                         */
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/*  ftlcdfil.c                                                             */
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/*                                                                         */
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/*    FreeType API for color filtering of subpixel bitmap glyphs (body).   */
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/*                                                                         */
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/*  Copyright 2006, 2008, 2009, 2010 by                                    */
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/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
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/*                                                                         */
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/*  This file is part of the FreeType project, and may only be used,       */
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/*  modified, and distributed under the terms of the FreeType project      */
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/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
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/*  this file you indicate that you have read the license and              */
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/*  understand and accept it fully.                                        */
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/*                                                                         */
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/***************************************************************************/
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#include <ft2build.h>
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#include FT_LCD_FILTER_H
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#include FT_IMAGE_H
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#include FT_INTERNAL_OBJECTS_H
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#ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
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/* define USE_LEGACY to implement the legacy filter */
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#define  USE_LEGACY
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  /* FIR filter used by the default and light filters */
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  static void
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  _ft_lcd_filter_fir( FT_Bitmap*      bitmap,
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                      FT_Render_Mode  mode,
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                      FT_Library      library )
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  {
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    FT_Byte*  weights = library->lcd_weights;
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    FT_UInt   width   = (FT_UInt)bitmap->width;
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    FT_UInt   height  = (FT_UInt)bitmap->rows;
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    /* horizontal in-place FIR filter */
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    if ( mode == FT_RENDER_MODE_LCD && width >= 4 )
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    {
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      FT_Byte*  line = bitmap->buffer;
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      for ( ; height > 0; height--, line += bitmap->pitch )
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      {
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        FT_UInt  fir[5];
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        FT_UInt  val1, xx;
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        val1   = line[0];
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        fir[0] = weights[2] * val1;
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        fir[1] = weights[3] * val1;
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        fir[2] = weights[4] * val1;
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        fir[3] = 0;
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        fir[4] = 0;
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        val1    = line[1];
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        fir[0] += weights[1] * val1;
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        fir[1] += weights[2] * val1;
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        fir[2] += weights[3] * val1;
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        fir[3] += weights[4] * val1;
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        for ( xx = 2; xx < width; xx++ )
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        {
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          FT_UInt  val, pix;
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          val    = line[xx];
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          pix    = fir[0] + weights[0] * val;
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          fir[0] = fir[1] + weights[1] * val;
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          fir[1] = fir[2] + weights[2] * val;
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          fir[2] = fir[3] + weights[3] * val;
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          fir[3] =          weights[4] * val;
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          pix        >>= 8;
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          pix         |= -( pix >> 8 );
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          line[xx - 2] = (FT_Byte)pix;
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        }
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        {
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          FT_UInt  pix;
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          pix          = fir[0] >> 8;
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          pix         |= -( pix >> 8 );
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          line[xx - 2] = (FT_Byte)pix;
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          pix          = fir[1] >> 8;
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          pix         |= -( pix >> 8 );
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          line[xx - 1] = (FT_Byte)pix;
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        }
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      }
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    }
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    /* vertical in-place FIR filter */
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    else if ( mode == FT_RENDER_MODE_LCD_V && height >= 4 )
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    {
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      FT_Byte*  column = bitmap->buffer;
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      FT_Int    pitch  = bitmap->pitch;
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      for ( ; width > 0; width--, column++ )
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      {
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        FT_Byte*  col = column;
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        FT_UInt   fir[5];
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        FT_UInt   val1, yy;
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        val1   = col[0];
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        fir[0] = weights[2] * val1;
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        fir[1] = weights[3] * val1;
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        fir[2] = weights[4] * val1;
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        fir[3] = 0;
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        fir[4] = 0;
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        col   += pitch;
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        val1    = col[0];
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        fir[0] += weights[1] * val1;
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        fir[1] += weights[2] * val1;
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        fir[2] += weights[3] * val1;
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        fir[3] += weights[4] * val1;
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        col    += pitch;
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        for ( yy = 2; yy < height; yy++ )
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        {
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          FT_UInt  val, pix;
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          val    = col[0];
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          pix    = fir[0] + weights[0] * val;
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          fir[0] = fir[1] + weights[1] * val;
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          fir[1] = fir[2] + weights[2] * val;
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          fir[2] = fir[3] + weights[3] * val;
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          fir[3] =          weights[4] * val;
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          pix           >>= 8;
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          pix            |= -( pix >> 8 );
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          col[-2 * pitch] = (FT_Byte)pix;
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          col            += pitch;
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        }
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        {
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          FT_UInt  pix;
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          pix             = fir[0] >> 8;
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          pix            |= -( pix >> 8 );
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          col[-2 * pitch] = (FT_Byte)pix;
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          pix         = fir[1] >> 8;
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          pix        |= -( pix >> 8 );
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          col[-pitch] = (FT_Byte)pix;
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        }
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      }
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    }
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  }
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#ifdef USE_LEGACY
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  /* intra-pixel filter used by the legacy filter */
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  static void
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  _ft_lcd_filter_legacy( FT_Bitmap*      bitmap,
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                         FT_Render_Mode  mode,
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                         FT_Library      library )
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  {
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    FT_UInt  width  = (FT_UInt)bitmap->width;
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    FT_UInt  height = (FT_UInt)bitmap->rows;
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    FT_Int   pitch  = bitmap->pitch;
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    static const int  filters[3][3] =
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    {
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      { 65538 * 9/13, 65538 * 1/6, 65538 * 1/13 },
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      { 65538 * 3/13, 65538 * 4/6, 65538 * 3/13 },
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      { 65538 * 1/13, 65538 * 1/6, 65538 * 9/13 }
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    };
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    FT_UNUSED( library );
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    /* horizontal in-place intra-pixel filter */
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    if ( mode == FT_RENDER_MODE_LCD && width >= 3 )
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    {
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      FT_Byte*  line = bitmap->buffer;
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      for ( ; height > 0; height--, line += pitch )
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      {
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        FT_UInt  xx;
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        for ( xx = 0; xx < width; xx += 3 )
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        {
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          FT_UInt  r = 0;
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          FT_UInt  g = 0;
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          FT_UInt  b = 0;
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          FT_UInt  p;
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          p  = line[xx];
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          r += filters[0][0] * p;
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          g += filters[0][1] * p;
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          b += filters[0][2] * p;
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          p  = line[xx + 1];
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          r += filters[1][0] * p;
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          g += filters[1][1] * p;
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          b += filters[1][2] * p;
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          p  = line[xx + 2];
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          r += filters[2][0] * p;
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          g += filters[2][1] * p;
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          b += filters[2][2] * p;
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          line[xx]     = (FT_Byte)( r / 65536 );
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          line[xx + 1] = (FT_Byte)( g / 65536 );
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          line[xx + 2] = (FT_Byte)( b / 65536 );
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        }
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      }
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    }
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    else if ( mode == FT_RENDER_MODE_LCD_V && height >= 3 )
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    {
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      FT_Byte*  column = bitmap->buffer;
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      for ( ; width > 0; width--, column++ )
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      {
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        FT_Byte*  col     = column;
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        FT_Byte*  col_end = col + height * pitch;
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        for ( ; col < col_end; col += 3 * pitch )
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        {
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          FT_UInt  r = 0;
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          FT_UInt  g = 0;
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          FT_UInt  b = 0;
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          FT_UInt  p;
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          p  = col[0];
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          r += filters[0][0] * p;
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          g += filters[0][1] * p;
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          b += filters[0][2] * p;
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          p  = col[pitch];
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          r += filters[1][0] * p;
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          g += filters[1][1] * p;
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          b += filters[1][2] * p;
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          p  = col[pitch * 2];
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          r += filters[2][0] * p;
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          g += filters[2][1] * p;
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          b += filters[2][2] * p;
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          col[0]         = (FT_Byte)( r / 65536 );
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          col[pitch]     = (FT_Byte)( g / 65536 );
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          col[2 * pitch] = (FT_Byte)( b / 65536 );
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   261
        }
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      }
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    }
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  }
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#endif /* USE_LEGACY */
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  FT_EXPORT_DEF( FT_Error )
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  FT_Library_SetLcdFilterWeights( FT_Library      library,
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                                  unsigned char  *weights )
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  {
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    if ( !library || !weights )
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      return FT_Err_Invalid_Argument;
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    ft_memcpy( library->lcd_weights, weights, 5 );
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    return FT_Err_Ok;
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  }
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  FT_EXPORT_DEF( FT_Error )
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  FT_Library_SetLcdFilter( FT_Library    library,
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                           FT_LcdFilter  filter )
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  {
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    static const FT_Byte  light_filter[5] =
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                            { 0x00, 0x55, 0x56, 0x55, 0x00 };
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    /* the values here sum up to a value larger than 256, */
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    /* providing a cheap gamma correction                 */
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    static const FT_Byte  default_filter[5] =
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                            { 0x10, 0x40, 0x70, 0x40, 0x10 };
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   292
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   293
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   294
    if ( !library )
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   295
      return FT_Err_Invalid_Argument;
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   296
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   297
    switch ( filter )
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   298
    {
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   299
    case FT_LCD_FILTER_NONE:
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      library->lcd_filter_func = NULL;
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      library->lcd_extra       = 0;
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      break;
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   303
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   304
    case FT_LCD_FILTER_DEFAULT:
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   305
#if defined( FT_FORCE_LEGACY_LCD_FILTER )
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   306
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      library->lcd_filter_func = _ft_lcd_filter_legacy;
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      library->lcd_extra       = 0;
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   309
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#elif defined( FT_FORCE_LIGHT_LCD_FILTER )
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   311
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      ft_memcpy( library->lcd_weights, light_filter, 5 );
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      library->lcd_filter_func = _ft_lcd_filter_fir;
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      library->lcd_extra       = 2;
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#else
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   317
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      ft_memcpy( library->lcd_weights, default_filter, 5 );
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      library->lcd_filter_func = _ft_lcd_filter_fir;
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      library->lcd_extra       = 2;
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#endif
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      break;
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    case FT_LCD_FILTER_LIGHT:
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      ft_memcpy( library->lcd_weights, light_filter, 5 );
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      library->lcd_filter_func = _ft_lcd_filter_fir;
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      library->lcd_extra       = 2;
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      break;
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   331
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#ifdef USE_LEGACY
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    case FT_LCD_FILTER_LEGACY:
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      library->lcd_filter_func = _ft_lcd_filter_legacy;
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      library->lcd_extra       = 0;
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      break;
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#endif
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    default:
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      return FT_Err_Invalid_Argument;
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    }
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    library->lcd_filter = filter;
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    return FT_Err_Ok;
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  }
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   349
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#else /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
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  FT_EXPORT_DEF( FT_Error )
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  FT_Library_SetLcdFilterWeights( FT_Library      library,
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                                  unsigned char  *weights )
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  {
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    FT_UNUSED( library );
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    FT_UNUSED( weights );
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   358
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    return FT_Err_Unimplemented_Feature;
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  }
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   361
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   362
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  FT_EXPORT_DEF( FT_Error )
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  FT_Library_SetLcdFilter( FT_Library    library,
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                           FT_LcdFilter  filter )
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  {
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    FT_UNUSED( library );
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    FT_UNUSED( filter );
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   369
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    return FT_Err_Unimplemented_Feature;
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   371
  }
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   372
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   373
#endif /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
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   374
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   375
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   376
/* END */