diff options
Diffstat (limited to 'freetype/src/truetype/ttgload.c')
-rw-r--r-- | freetype/src/truetype/ttgload.c | 163 |
1 files changed, 159 insertions, 4 deletions
diff --git a/freetype/src/truetype/ttgload.c b/freetype/src/truetype/ttgload.c index 1e6102cc6..04a5a2933 100644 --- a/freetype/src/truetype/ttgload.c +++ b/freetype/src/truetype/ttgload.c @@ -32,6 +32,7 @@ #endif #include "tterrors.h" +#include "ttsubpix.h" /*************************************************************************/ @@ -149,6 +150,15 @@ loader->top_bearing = top_bearing; loader->vadvance = advance_height; +#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING + if ( loader->exec ) + loader->exec->sph_tweak_flags = 0; + + /* this may not be the right place for this, but it works */ + if ( loader->exec && loader->exec->ignore_x_mode ) + sph_set_tweaks( loader, glyph_index ); +#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */ + if ( !loader->linear_def ) { loader->linear_def = 1; @@ -252,10 +262,6 @@ } -#undef IS_HINTED -#define IS_HINTED( flags ) ( ( flags & FT_LOAD_NO_HINTING ) == 0 ) - - /*************************************************************************/ /* */ /* The following functions are used by default with TrueType fonts. */ @@ -813,6 +819,13 @@ loader->pp4 = zone->cur[zone->n_points - 1]; } +#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING + if ( loader->exec->sph_tweak_flags & SPH_TWEAK_DEEMBOLDEN ) + FT_Outline_EmboldenXY( &loader->gloader->current.outline, -24, 0 ); + + else if ( loader->exec->sph_tweak_flags & SPH_TWEAK_EMBOLDEN ) + FT_Outline_EmboldenXY( &loader->gloader->current.outline, 24, 0 ); +#endif return TT_Err_Ok; } @@ -835,6 +848,14 @@ FT_Outline* outline; FT_Int n_points; +#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING + TT_Face face = (TT_Face)loader->face; + FT_String* family = face->root.family_name; + FT_Int ppem = loader->size->metrics.x_ppem; + FT_String* style = face->root.style_name; + FT_Int x_scale_factor = 1000; +#endif + outline = &gloader->current.outline; n_points = outline->n_points; @@ -889,6 +910,32 @@ loader->zone.n_points + 4 ); } +#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING + /* scale, but only if enabled and only if TT hinting is being used */ + if ( IS_HINTED( loader->load_flags ) ) + x_scale_factor = scale_test_tweak( face, family, ppem, style, + loader->glyph_index, X_SCALING_Rules, + X_SCALING_RULES_SIZE ); + /* scale the glyph */ + if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 || + x_scale_factor != 1000 ) + { + FT_Vector* vec = outline->points; + FT_Vector* limit = outline->points + n_points; + FT_Fixed x_scale = FT_MulDiv( + ((TT_Size)loader->size)->metrics.x_scale, + x_scale_factor, 1000 ); + FT_Fixed y_scale = ((TT_Size)loader->size)->metrics.y_scale; + + + /* compensate for any scaling by de/emboldening; */ + /* the amount was determined via experimentation */ + if ( x_scale_factor != 1000 && ppem > 11 ) + FT_Outline_EmboldenXY( outline, + FT_MulFix( 1280 * ppem, + 1000 - x_scale_factor ), + 0 ); +#else /* scale the glyph */ if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) { @@ -896,6 +943,7 @@ FT_Vector* limit = outline->points + n_points; FT_Fixed x_scale = ((TT_Size)loader->size)->metrics.x_scale; FT_Fixed y_scale = ((TT_Size)loader->size)->metrics.y_scale; +#endif /* !TT_CONFIG_OPTION_SUBPIXEL_HINTING */ for ( ; vec < limit; vec++ ) @@ -1648,12 +1696,26 @@ { FT_Byte* widthp; +#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING + FT_Bool ignore_x_mode; + + + ignore_x_mode = FT_BOOL( FT_LOAD_TARGET_MODE( loader->load_flags ) != + FT_RENDER_MODE_MONO ); +#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */ widthp = tt_face_get_device_metrics( face, size->root.metrics.x_ppem, glyph_index ); +#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING + if ( widthp && + ( ( ignore_x_mode && loader->exec->compatible_widths ) || + !ignore_x_mode || + SPH_OPTION_BITMAP_WIDTHS ) ) +#else if ( widthp ) +#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */ glyph->metrics.horiAdvance = *widthp << 6; } @@ -1833,7 +1895,9 @@ { TT_Face face; FT_Stream stream; +#ifdef TT_USE_BYTECODE_INTERPRETER FT_Bool pedantic = FT_BOOL( load_flags & FT_LOAD_PEDANTIC ); +#endif face = (TT_Face)glyph->face; @@ -1848,6 +1912,16 @@ { TT_ExecContext exec; FT_Bool grayscale; +#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING + FT_Bool subpixel_hinting; + FT_Bool grayscale_hinting; +#if 0 + FT_Bool compatible_widths; + FT_Bool symmetrical_smoothing; + FT_Bool bgr; + FT_Bool subpixel_positioned; +#endif +#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */ if ( !size->cvt_ready ) @@ -1865,11 +1939,90 @@ if ( !exec ) return TT_Err_Could_Not_Find_Context; +#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING + + subpixel_hinting = FT_BOOL( ( FT_LOAD_TARGET_MODE( load_flags ) + != FT_RENDER_MODE_MONO ) && + SPH_OPTION_SET_SUBPIXEL ); + + if ( subpixel_hinting ) + grayscale = grayscale_hinting = FALSE; + + else if ( SPH_OPTION_SET_GRAYSCALE ) + { + grayscale = grayscale_hinting = TRUE; + subpixel_hinting = FALSE; + } + + if ( FT_IS_TRICKY( glyph->face ) ) + subpixel_hinting = grayscale_hinting = FALSE; + + exec->ignore_x_mode = subpixel_hinting || grayscale_hinting; + exec->rasterizer_version = SPH_OPTION_SET_RASTERIZER_VERSION; + if ( exec->sph_tweak_flags & SPH_TWEAK_RASTERIZER_35 ) + exec->rasterizer_version = 35; + +#if 1 + exec->compatible_widths = SPH_OPTION_SET_COMPATIBLE_WIDTHS; + exec->symmetrical_smoothing = FALSE; + exec->bgr = FALSE; + exec->subpixel_positioned = TRUE; +#else /* 0 */ + exec->compatible_widths = + FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != + TT_LOAD_COMPATIBLE_WIDTHS ); + exec->symmetrical_smoothing = + FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != + TT_LOAD_SYMMETRICAL_SMOOTHING ); + exec->bgr = + FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != + TT_LOAD_BGR ); + exec->subpixel_positioned = + FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != + TT_LOAD_SUBPIXEL_POSITIONED ); +#endif /* 0 */ + +#else /* !TT_CONFIG_OPTION_SUBPIXEL_HINTING */ + grayscale = FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != FT_RENDER_MODE_MONO ); +#endif /* !TT_CONFIG_OPTION_SUBPIXEL_HINTING */ + TT_Load_Context( exec, face, size ); +#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING + + /* a change from mono to subpixel rendering (and vice versa) */ + /* requires a re-execution of the CVT program */ + if ( subpixel_hinting != exec->subpixel_hinting ) + { + FT_UInt i; + + + exec->subpixel_hinting = subpixel_hinting; + + for ( i = 0; i < size->cvt_size; i++ ) + size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale ); + tt_size_run_prep( size, pedantic ); + } + + /* a change from mono to grayscale rendering (and vice versa) */ + /* requires a re-execution of the CVT program */ + if ( grayscale != exec->grayscale_hinting ) + { + FT_UInt i; + + + exec->grayscale_hinting = grayscale_hinting; + + for ( i = 0; i < size->cvt_size; i++ ) + size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale ); + tt_size_run_prep( size, pedantic ); + } + +#else /* !TT_CONFIG_OPTION_SUBPIXEL_HINTING */ + /* a change from mono to grayscale rendering (and vice versa) */ /* requires a re-execution of the CVT program */ if ( grayscale != exec->grayscale ) @@ -1887,6 +2040,8 @@ tt_size_run_prep( size, pedantic ); } +#endif /* !TT_CONFIG_OPTION_SUBPIXEL_HINTING */ + /* see whether the cvt program has disabled hinting */ if ( exec->GS.instruct_control & 1 ) load_flags |= FT_LOAD_NO_HINTING; |