ref: 6ee89519561aa33c63abcb24ae63920742f81316
dir: /src/base/ftsynth.c/
/**************************************************************************** * * ftsynth.c * * FreeType synthesizing code for emboldening and slanting (body). * * Copyright (C) 2000-2022 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 <freetype/ftsynth.h> #include <freetype/internal/ftdebug.h> #include <freetype/internal/ftobjs.h> #include <freetype/ftoutln.h> #include <freetype/ftbitmap.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 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; if ( !slot ) return; 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; FT_Face face; FT_Error error; FT_Pos xstr, ystr; if ( !slot ) return; library = slot->library; face = slot->face; 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 ) 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 emboldening parameter ystr=%ld\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; slot->metrics.horiBearingY += 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 */