ref: 1a37e4174bf2a4353b5b6dc2e089eb0765c1dc8f
dir: /src/base/ftsynth.c/
/***************************************************************************/ /* */ /* ftsynth.c */ /* */ /* FreeType synthesizing code for emboldening and slanting (body). */ /* */ /* Copyright 2000-2006, 2010, 2012 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_DEBUG_H #include FT_INTERNAL_OBJECTS_H #include FT_OUTLINE_H #include FT_BITMAP_H /*************************************************************************/ /* */ /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ /* messages during execution. */ /* */ #undef FT_COMPONENT #define FT_COMPONENT trace_synth /*************************************************************************/ /*************************************************************************/ /**** ****/ /**** 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 = 0x0366AL; transform.yy = 0x10000L; FT_Outline_Transform( outline, &transform ); } /*************************************************************************/ /*************************************************************************/ /**** ****/ /**** EXPERIMENTAL EMBOLDENING SUPPORT ****/ /**** ****/ /*************************************************************************/ /*************************************************************************/ /* documentation is in ftsynth.h */ FT_EXPORT_DEF( void ) FT_GlyphSlot_Embolden( FT_GlyphSlot slot ) { FT_Library library = slot->library; FT_Face face = slot->face; 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 ) { /* ignore error */ (void)FT_Outline_EmboldenXY( &slot->outline, xstr, ystr ); } else /* slot->format == FT_GLYPH_FORMAT_BITMAP */ { /* round to full pixels */ xstr &= ~63; if ( xstr == 0 ) xstr = 1 << 6; ystr &= ~63; /* * XXX: overflow check for 16-bit system, for compatibility * with FT_GlyphSlot_Embolden() since freetype-2.1.10. * unfortunately, this function return no informations * about the cause of error. */ if ( ( ystr >> 6 ) > FT_INT_MAX || ( ystr >> 6 ) < FT_INT_MIN ) { FT_TRACE1(( "FT_GlyphSlot_Embolden:" )); FT_TRACE1(( "too strong embolding parameter ystr=%d\n", ystr )); return; } 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.horiAdvance += xstr; slot->metrics.vertAdvance += ystr; /* XXX: 16-bit overflow case must be excluded before here */ if ( slot->format == FT_GLYPH_FORMAT_BITMAP ) slot->bitmap_top += (FT_Int)( ystr >> 6 ); } /* END */