1 /***************************************************************************/ 2 /* */ 3 /* ftsynth.c */ 4 /* */ 5 /* FreeType synthesizing code for emboldening and slanting (body). */ 6 /* */ 7 /* Copyright 2000-2001, 2002, 2003, 2004, 2005, 2006 by */ 8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ 9 /* */ 10 /* This file is part of the FreeType project, and may only be used, */ 11 /* modified, and distributed under the terms of the FreeType project */ 12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 13 /* this file you indicate that you have read the license and */ 14 /* understand and accept it fully. */ 15 /* */ 16 /***************************************************************************/ 17 18 19 #include <ft2build.h> 20 #include FT_SYNTHESIS_H 21 #include FT_INTERNAL_OBJECTS_H 22 #include FT_OUTLINE_H 23 #include FT_BITMAP_H 24 25 26 /*************************************************************************/ 27 /*************************************************************************/ 28 /**** ****/ 29 /**** EXPERIMENTAL OBLIQUING SUPPORT ****/ 30 /**** ****/ 31 /*************************************************************************/ 32 /*************************************************************************/ 33 34 /* documentation is in ftsynth.h */ 35 36 FT_EXPORT_DEF( void ) FT_GlyphSlot_Oblique(FT_GlyphSlot slot)37 FT_GlyphSlot_Oblique( FT_GlyphSlot slot ) 38 { 39 FT_Matrix transform; 40 FT_Outline* outline = &slot->outline; 41 42 43 /* only oblique outline glyphs */ 44 if ( slot->format != FT_GLYPH_FORMAT_OUTLINE ) 45 return; 46 47 /* we don't touch the advance width */ 48 49 /* For italic, simply apply a shear transform, with an angle */ 50 /* of about 12 degrees. */ 51 52 transform.xx = 0x10000L; 53 transform.yx = 0x00000L; 54 55 transform.xy = 0x06000L; 56 transform.yy = 0x10000L; 57 58 FT_Outline_Transform( outline, &transform ); 59 } 60 61 62 /*************************************************************************/ 63 /*************************************************************************/ 64 /**** ****/ 65 /**** EXPERIMENTAL EMBOLDENING/OUTLINING SUPPORT ****/ 66 /**** ****/ 67 /*************************************************************************/ 68 /*************************************************************************/ 69 70 71 /* documentation is in ftsynth.h */ 72 73 FT_EXPORT_DEF( void ) FT_GlyphSlot_Embolden(FT_GlyphSlot slot)74 FT_GlyphSlot_Embolden( FT_GlyphSlot slot ) 75 { 76 FT_Library library = slot->library; 77 FT_Face face = slot->face; 78 FT_Error error; 79 FT_Pos xstr, ystr; 80 81 82 if ( slot->format != FT_GLYPH_FORMAT_OUTLINE && 83 slot->format != FT_GLYPH_FORMAT_BITMAP ) 84 return; 85 86 /* some reasonable strength */ 87 xstr = FT_MulFix( face->units_per_EM, 88 face->size->metrics.y_scale ) / 24; 89 ystr = xstr; 90 91 if ( slot->format == FT_GLYPH_FORMAT_OUTLINE ) 92 { 93 error = FT_Outline_Embolden( &slot->outline, xstr ); 94 /* ignore error */ 95 96 /* this is more than enough for most glyphs; if you need accurate */ 97 /* values, you have to call FT_Outline_Get_CBox */ 98 xstr = xstr * 2; 99 ystr = xstr; 100 } 101 else if ( slot->format == FT_GLYPH_FORMAT_BITMAP ) 102 { 103 /* round to full pixels */ 104 xstr &= ~63; 105 if ( xstr == 0 ) 106 xstr = 1 << 6; 107 ystr &= ~63; 108 109 error = FT_GlyphSlot_Own_Bitmap( slot ); 110 if ( error ) 111 return; 112 113 error = FT_Bitmap_Embolden( library, &slot->bitmap, xstr, ystr ); 114 if ( error ) 115 return; 116 } 117 118 if ( slot->advance.x ) 119 slot->advance.x += xstr; 120 121 if ( slot->advance.y ) 122 slot->advance.y += ystr; 123 124 slot->metrics.width += xstr; 125 slot->metrics.height += ystr; 126 slot->metrics.horiBearingY += ystr; 127 slot->metrics.horiAdvance += xstr; 128 slot->metrics.vertBearingX -= xstr / 2; 129 slot->metrics.vertBearingY += ystr; 130 slot->metrics.vertAdvance += ystr; 131 132 if ( slot->format == FT_GLYPH_FORMAT_BITMAP ) 133 slot->bitmap_top += ystr >> 6; 134 } 135 136 137 /* END */ 138