| --- freetype-2.3.11/builds/unix/configure.orig 2010-08-25 13:37:30.000000000 -0700 |
| +++ freetype-2.3.11/builds/unix/configure 2010-08-25 14:23:35.000000000 -0700 |
| @@ -6043,7 +6043,7 @@ |
| fi |
| if test x$with_zlib != xno && test -n "$LIBZ"; then |
| CFLAGS="$CFLAGS -DFT_CONFIG_OPTION_SYSTEM_ZLIB" |
| - LDFLAGS="$LDFLAGS $LIBZ" |
| + LDFLAGS="$LDFLAGS $LIBZ -lm" |
| SYSTEM_ZLIB=yes |
| fi |
| |
| /*************************************************************************/ |
| diff --git a/src/smooth/ftsmooth.c b/src/smooth/ftsmooth.c |
| index 7d16b94..57de912 100644 |
| --- a/src/smooth/ftsmooth.c |
| +++ b/src/smooth/ftsmooth.c |
| @@ -25,6 +25,7 @@ |
| #include "ftspic.h" |
| |
| #include "ftsmerrs.h" |
| +#include <math.h> |
| |
| |
| /* initialize renderer -- init its raster */ |
| @@ -94,6 +95,47 @@ |
| } |
| |
| |
| + /* soften the sub-pixel anti-aliasing and sharpen */ |
| + static void |
| + _ft_subpixel_sharpen( FT_Bitmap* bitmap, |
| + FT_Render_Mode mode, |
| + FT_Byte cutoff, |
| + double gamma_value ) |
| + { |
| + static FT_Bool initialized_gamma = FALSE; |
| + static unsigned short gamma_ramp[256]; |
| + FT_UInt width = (FT_UInt)bitmap->width; |
| + FT_UInt height = (FT_UInt)bitmap->rows; |
| + int ii; |
| + if (!initialized_gamma) |
| + { |
| + initialized_gamma = TRUE; |
| + /* linear to voltage */ |
| + for ( ii = 0; ii < 256; ii++ ) |
| + { |
| + gamma_ramp[ii] = (unsigned char) |
| + ( pow( (double)ii/255.0, gamma_value ) * 255.0f ); |
| + if (gamma_ramp[ii] < cutoff) { |
| + gamma_ramp[ii] = 0; |
| + } |
| + } |
| + } |
| + |
| + /* horizontal in-place sub-pixel sharpening filter */ |
| + if ( mode == FT_RENDER_MODE_LCD) |
| + { |
| + FT_Byte* line = bitmap->buffer; |
| + for ( ; height > 0; height--, line += bitmap->pitch ) |
| + { |
| + FT_UInt xx; |
| + for ( xx = 0; xx < width; xx++ ) |
| + { |
| + line[xx] = gamma_ramp[line[xx]]; |
| + } |
| + } |
| + } |
| + } |
| + |
| /* convert a slot's glyph image into a bitmap */ |
| static FT_Error |
| ft_smooth_render_generic( FT_Renderer render, |
| @@ -265,6 +307,12 @@ |
| vec->y /= 3; |
| } |
| |
| + /* These should be controllable */ |
| + FT_Byte cutoff = (FT_Byte)(0.25 * 255.0); |
| + double gamma_value = 1.2; |
| + /* sharpen the glyphs */ |
| + _ft_subpixel_sharpen( bitmap, mode, cutoff, gamma_value ); |
| + |
| if ( slot->library->lcd_filter_func ) |
| slot->library->lcd_filter_func( bitmap, mode, slot->library ); |
| |
