ref: 9ca782569c218e18c420e7c13bdbdf3e9a75c87a
dir: /src/base/ftsynth.c/
/***************************************************************************/ /* */ /* 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; } /* assume the layout is horizontal */ slot->advance.x += xstr; 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 */