ref: a95e5c62decad738707748efe78f8dba349c6d51
dir: /src/base/ftlcdfil.c/
/***************************************************************************/
/* */
/* ftlcdfil.c */
/* */
/* FreeType API for color filtering of subpixel bitmap glyphs (body). */
/* */
/* Copyright 2006 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
/* FIR filter used by the default and light filters */
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 FIR 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( FT_Error )
FT_Library_SetLcdFilter( FT_Library library,
FT_LcdFilter filter )
{
static const FT_Byte light_filter[5] = { 0, 85, 86, 85, 0 };
static const FT_Byte default_filter[5] = { 0x10, 0x40, 0x70, 0x40, 0x10 };
if ( library == NULL )
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)
memcpy( library->lcd_weights, default_filter, 5 );
library->lcd_filter_func = _ft_lcd_filter_fir;
library->lcd_extra = 2;
#else
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:
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 0;
}
#else /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
FT_EXPORT( 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 */