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* src/base/ftlcdfil.c (_ft_lcd_filter_legacy): Updated comment to 

mention intra-pixel algorithm.

* include/freetype/freetype.h (FT_Render_Mode): Mention that
FT_Library_SetLcdFilter can be used to reduce fringes.
This commit is contained in:
Werner Lemberg 2008-01-18 05:32:55 +00:00
parent 61d83d0938
commit 4c93399155
3 changed files with 18 additions and 8 deletions
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10
ChangeLog
View File

@ -1,3 +1,11 @@
2008-01-18 Sylvain Pasche <sylvain.pasche@gmail.com>
* src/base/ftlcdfil.c (_ft_lcd_filter_legacy): Updated comment to
mention intra-pixel algorithm.
* include/freetype/freetype.h (FT_Render_Mode): Mention that
FT_Library_SetLcdFilter can be used to reduce fringes.
2008-01-16 Werner Lemberg <wl@gnu.org>
* src/raster/ftraster.c (ft_black_render): Check `outline' before
@ -2923,7 +2931,7 @@
----------------------------------------------------------------------------
Copyright 2006, 2007 by
Copyright 2006, 2007, 2008 by
David Turner, Robert Wilhelm, and Werner Lemberg.
This file is part of the FreeType project, and may only be used, modified,

10
include/freetype/freetype.h
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@ -4,7 +4,7 @@
/* */
/* FreeType high-level API and common types (specification only). */
/* */
/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007 by */
/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
@ -2545,9 +2545,11 @@ FT_BEGIN_HEADER
/* glyph outline in pixels and use the @FT_PIXEL_MODE_LCD_V mode. */
/* */
/* <Note> */
/* The LCD-optimized glyph bitmaps produced by FT_Render_Glyph are */
/* _not_ _filtered_ to reduce color-fringes. It is up to the caller */
/* to perform this pass. */
/* The LCD-optimized glyph bitmaps produced by FT_Render_Glyph can be */
/* filtered to reduce color-fringes by using @FT_Library_SetLcdFilter */
/* (not active in the default builds). It is up to the caller to */
/* either call @FT_Library_SetLcdFilter (if available) or do the */
/* filtering itself. */
/* */
typedef enum FT_Render_Mode_
{

6
src/base/ftlcdfil.c
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@ -4,7 +4,7 @@
/* */
/* FreeType API for color filtering of subpixel bitmap glyphs (body). */
/* */
/* Copyright 2006 by */
/* Copyright 2006, 2008 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
@ -161,7 +161,7 @@
#ifdef USE_LEGACY
/* FIR filter used by the default and light filters */
/* intra-pixel filter used by the legacy filter */
static void
_ft_lcd_filter_legacy( FT_Bitmap* bitmap,
FT_Render_Mode mode,
@ -181,7 +181,7 @@
FT_UNUSED( library );
/* horizontal in-place FIR filter */
/* horizontal in-place intra-pixel filter */
if ( mode == FT_RENDER_MODE_LCD && width >= 3 )
{
FT_Byte* line = bitmap->buffer;