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freetype2
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Code Issues 4 Releases Wiki Activity

Tweak LCD filtering. 

* src/base/ftlcdfil.c (ft_lcd_filter_fir, _ft_lcd_filter_legacy):
Choose direction from bitmap's pixel_mode.
* include/freetype/internal/ftobjs.c (FT_Bitmap_LcdFilterFunc):
Updated.
* src/smooth/ftsmooth.c (ft_smooth_render_generic): Updated.
This commit is contained in:
Alexei Podtelezhnikov 2019-05-02 23:06:55 -04:00
parent 65e4925af4
commit 65f9516bc7
4 changed files with 17 additions and 9 deletions
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10
ChangeLog
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@ -1,3 +1,13 @@
2019-05-02 Alexei Podtelezhnikov <apodtele@gmail.com>
Tweak LCD filtering.
* src/base/ftlcdfil.c (ft_lcd_filter_fir, _ft_lcd_filter_legacy):
Choose direction from bitmap's pixel_mode.
* include/freetype/internal/ftobjs.c (FT_Bitmap_LcdFilterFunc):
Updated.
* src/smooth/ftsmooth.c (ft_smooth_render_generic): Updated.
2019-05-02 Werner Lemberg <wl@gnu.org>
* vms_make.com: Updated (#56253).

2
include/freetype/internal/ftobjs.h
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@ -278,14 +278,12 @@ FT_BEGIN_HEADER
#ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
typedef void (*FT_Bitmap_LcdFilterFunc)( FT_Bitmap* bitmap,
FT_Render_Mode render_mode,
FT_Byte* weights );
/* This is the default LCD filter, an in-place, 5-tap FIR filter. */
FT_BASE( void )
ft_lcd_filter_fir( FT_Bitmap* bitmap,
FT_Render_Mode mode,
FT_LcdFiveTapFilter weights );
#endif /* FT_CONFIG_OPTION_SUBPIXEL_RENDERING */

12
src/base/ftlcdfil.c
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@ -77,13 +77,13 @@
/* FIR filter used by the default and light filters */
FT_BASE_DEF( void )
ft_lcd_filter_fir( FT_Bitmap* bitmap,
FT_Render_Mode mode,
FT_LcdFiveTapFilter weights )
{
FT_UInt width = (FT_UInt)bitmap->width;
FT_UInt height = (FT_UInt)bitmap->rows;
FT_Int pitch = bitmap->pitch;
FT_Byte* origin = bitmap->buffer;
FT_Byte mode = bitmap->pixel_mode;
/* take care of bitmap flow */
@ -91,7 +91,7 @@
origin += pitch * (FT_Int)( height - 1 );
/* horizontal in-place FIR filter */
if ( mode == FT_RENDER_MODE_LCD && width >= 2 )
if ( mode == FT_PIXEL_MODE_LCD && width >= 2 )
{
FT_Byte* line = origin;
@ -134,7 +134,7 @@
}
/* vertical in-place FIR filter */
else if ( mode == FT_RENDER_MODE_LCD_V && height >= 2 )
else if ( mode == FT_PIXEL_MODE_LCD_V && height >= 2 )
{
FT_Byte* column = origin;
@ -183,13 +183,13 @@
/* intra-pixel filter used by the legacy filter */
static void
_ft_lcd_filter_legacy( FT_Bitmap* bitmap,
FT_Render_Mode mode,
FT_Byte* weights )
{
FT_UInt width = (FT_UInt)bitmap->width;
FT_UInt height = (FT_UInt)bitmap->rows;
FT_Int pitch = bitmap->pitch;
FT_Byte* origin = bitmap->buffer;
FT_Byte mode = bitmap->pixel_mode;
static const unsigned int filters[3][3] =
{
@ -206,7 +206,7 @@
origin += pitch * (FT_Int)( height - 1 );
/* horizontal in-place intra-pixel filter */
if ( mode == FT_RENDER_MODE_LCD && width >= 3 )
if ( mode == FT_PIXEL_MODE_LCD && width >= 3 )
{
FT_Byte* line = origin;
@ -243,7 +243,7 @@
}
}
}
else if ( mode == FT_RENDER_MODE_LCD_V && height >= 3 )
else if ( mode == FT_PIXEL_MODE_LCD_V && height >= 3 )
{
FT_Byte* column = origin;

2
src/smooth/ftsmooth.c
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@ -243,7 +243,7 @@
}
if ( lcd_filter_func )
lcd_filter_func( bitmap, mode, lcd_weights );
lcd_filter_func( bitmap, lcd_weights );
}
#else /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */