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