| /***************************************************************************/ |
| /* */ |
| /* ftsynth.c */ |
| /* */ |
| /* FreeType synthesizing code for emboldening and slanting (body). */ |
| /* */ |
| /* Copyright 2000-2001, 2002, 2003, 2004, 2005, 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_SYNTHESIS_H |
| #include FT_INTERNAL_OBJECTS_H |
| #include FT_OUTLINE_H |
| #include FT_BITMAP_H |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /**** ****/ |
| /**** EXPERIMENTAL OBLIQUING SUPPORT ****/ |
| /**** ****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| /* documentation is in ftsynth.h */ |
| |
| FT_EXPORT_DEF( void ) |
| FT_GlyphSlot_Oblique( FT_GlyphSlot slot ) |
| { |
| FT_Matrix transform; |
| FT_Outline* outline = &slot->outline; |
| |
| |
| /* only oblique outline glyphs */ |
| if ( slot->format != FT_GLYPH_FORMAT_OUTLINE ) |
| return; |
| |
| /* we don't touch the advance width */ |
| |
| /* For italic, simply apply a shear transform, with an angle */ |
| /* of about 12 degrees. */ |
| |
| transform.xx = 0x10000L; |
| transform.yx = 0x00000L; |
| |
| transform.xy = 0x06000L; |
| transform.yy = 0x10000L; |
| |
| FT_Outline_Transform( outline, &transform ); |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /**** ****/ |
| /**** EXPERIMENTAL EMBOLDENING/OUTLINING SUPPORT ****/ |
| /**** ****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| |
| FT_EXPORT_DEF( FT_Error ) |
| FT_GlyphSlot_Own_Bitmap( FT_GlyphSlot slot ) |
| { |
| if ( slot && slot->format == FT_GLYPH_FORMAT_BITMAP && |
| !( slot->internal->flags & FT_GLYPH_OWN_BITMAP ) ) |
| { |
| FT_Bitmap bitmap; |
| FT_Error error; |
| |
| |
| FT_Bitmap_New( &bitmap ); |
| error = FT_Bitmap_Copy( slot->library, &slot->bitmap, &bitmap ); |
| if ( error ) |
| return error; |
| |
| slot->bitmap = bitmap; |
| slot->internal->flags |= FT_GLYPH_OWN_BITMAP; |
| } |
| |
| return FT_Err_Ok; |
| } |
| |
| |
| /* documentation is in ftsynth.h */ |
| |
| FT_EXPORT_DEF( void ) |
| FT_GlyphSlot_Embolden( FT_GlyphSlot slot ) |
| { |
| FT_Library library = slot->library; |
| FT_Face face = FT_SLOT_FACE( slot ); |
| FT_Error error; |
| FT_Pos xstr, ystr; |
| |
| |
| if ( slot->format != FT_GLYPH_FORMAT_OUTLINE && |
| slot->format != FT_GLYPH_FORMAT_BITMAP ) |
| return; |
| |
| /* some reasonable strength */ |
| xstr = FT_MulFix( face->units_per_EM, |
| face->size->metrics.y_scale ) / 24; |
| ystr = xstr; |
| |
| if ( slot->format == FT_GLYPH_FORMAT_OUTLINE ) |
| { |
| error = FT_Outline_Embolden( &slot->outline, xstr ); |
| /* ignore error */ |
| |
| /* this is more than enough for most glyphs; if you need accurate */ |
| /* values, you have to call FT_Outline_Get_CBox */ |
| xstr = xstr * 2; |
| ystr = xstr; |
| } |
| else if ( slot->format == FT_GLYPH_FORMAT_BITMAP ) |
| { |
| xstr = FT_PIX_FLOOR( xstr ); |
| if ( xstr == 0 ) |
| xstr = 1 << 6; |
| ystr = FT_PIX_FLOOR( ystr ); |
| |
| error = FT_GlyphSlot_Own_Bitmap( slot ); |
| if ( error ) |
| return; |
| |
| error = FT_Bitmap_Embolden( library, &slot->bitmap, xstr, ystr ); |
| if ( error ) |
| return; |
| } |
| |
| if ( slot->advance.x ) |
| slot->advance.x += xstr; |
| |
| if ( slot->advance.y ) |
| slot->advance.y += ystr; |
| |
| slot->metrics.width += xstr; |
| slot->metrics.height += ystr; |
| slot->metrics.horiBearingY += ystr; |
| slot->metrics.horiAdvance += xstr; |
| slot->metrics.vertBearingX -= xstr / 2; |
| slot->metrics.vertBearingY += ystr; |
| slot->metrics.vertAdvance += ystr; |
| |
| if ( slot->format == FT_GLYPH_FORMAT_BITMAP ) |
| slot->bitmap_top += ystr >> 6; |
| } |
| |
| |
| /* END */ |
