1 /***************************************************************************/ 2 /* */ 3 /* ftsynth.c */ 4 /* */ 5 /* FreeType synthesizing code for emboldening and slanting (body). */ 6 /* */ 7 /* Copyright 2000-2006, 2010, 2012, 2013 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_DEBUG_H 22 #include FT_INTERNAL_OBJECTS_H 23 #include FT_OUTLINE_H 24 #include FT_BITMAP_H 25 26 27 /*************************************************************************/ 28 /* */ 29 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 30 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 31 /* messages during execution. */ 32 /* */ 33 #undef FT_COMPONENT 34 #define FT_COMPONENT trace_synth 35 36 37 /*************************************************************************/ 38 /*************************************************************************/ 39 /**** ****/ 40 /**** EXPERIMENTAL OBLIQUING SUPPORT ****/ 41 /**** ****/ 42 /*************************************************************************/ 43 /*************************************************************************/ 44 45 /* documentation is in ftsynth.h */ 46 47 FT_EXPORT_DEF( void ) 48 FT_GlyphSlot_Oblique( FT_GlyphSlot slot ) 49 { 50 FT_Matrix transform; 51 FT_Outline* outline = &slot->outline; 52 53 54 /* only oblique outline glyphs */ 55 if ( slot->format != FT_GLYPH_FORMAT_OUTLINE ) 56 return; 57 58 /* we don't touch the advance width */ 59 60 /* For italic, simply apply a shear transform, with an angle */ 61 /* of about 12 degrees. */ 62 63 transform.xx = 0x10000L; 64 transform.yx = 0x00000L; 65 66 transform.xy = 0x0366AL; 67 transform.yy = 0x10000L; 68 69 FT_Outline_Transform( outline, &transform ); 70 } 71 72 73 /*************************************************************************/ 74 /*************************************************************************/ 75 /**** ****/ 76 /**** EXPERIMENTAL EMBOLDENING SUPPORT ****/ 77 /**** ****/ 78 /*************************************************************************/ 79 /*************************************************************************/ 80 81 82 /* documentation is in ftsynth.h */ 83 84 FT_EXPORT_DEF( void ) 85 FT_GlyphSlot_Embolden( FT_GlyphSlot slot ) 86 { 87 FT_Library library = slot->library; 88 FT_Face face = slot->face; 89 FT_Error error; 90 FT_Pos xstr, ystr; 91 92 93 if ( slot->format != FT_GLYPH_FORMAT_OUTLINE && 94 slot->format != FT_GLYPH_FORMAT_BITMAP ) 95 return; 96 97 /* some reasonable strength */ 98 xstr = FT_MulFix( face->units_per_EM, 99 face->size->metrics.y_scale ) / 24; 100 ystr = xstr; 101 102 if ( slot->format == FT_GLYPH_FORMAT_OUTLINE ) 103 { 104 /* ignore error */ 105 (void)FT_Outline_EmboldenXY( &slot->outline, xstr, ystr ); 106 } 107 else /* slot->format == FT_GLYPH_FORMAT_BITMAP */ 108 { 109 /* round to full pixels */ 110 xstr &= ~63; 111 if ( xstr == 0 ) 112 xstr = 1 << 6; 113 ystr &= ~63; 114 115 /* 116 * XXX: overflow check for 16-bit system, for compatibility 117 * with FT_GlyphSlot_Embolden() since freetype-2.1.10. 118 * unfortunately, this function return no informations 119 * about the cause of error. 120 */ 121 if ( ( ystr >> 6 ) > FT_INT_MAX || ( ystr >> 6 ) < FT_INT_MIN ) 122 { 123 FT_TRACE1(( "FT_GlyphSlot_Embolden:" )); 124 FT_TRACE1(( "too strong embolding parameter ystr=%d\n", ystr )); 125 return; 126 } 127 error = FT_GlyphSlot_Own_Bitmap( slot ); 128 if ( error ) 129 return; 130 131 error = FT_Bitmap_Embolden( library, &slot->bitmap, xstr, ystr ); 132 if ( error ) 133 return; 134 } 135 136 if ( slot->advance.x ) 137 slot->advance.x += xstr; 138 139 if ( slot->advance.y ) 140 slot->advance.y += ystr; 141 142 slot->metrics.width += xstr; 143 slot->metrics.height += ystr; 144 slot->metrics.horiAdvance += xstr; 145 slot->metrics.vertAdvance += ystr; 146 slot->metrics.horiBearingY += ystr; 147 148 /* XXX: 16-bit overflow case must be excluded before here */ 149 if ( slot->format == FT_GLYPH_FORMAT_BITMAP ) 150 slot->bitmap_top += (FT_Int)( ystr >> 6 ); 151 } 152 153 154 /* END */ 155
