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| 1 /***************************************************************************/ | |
| 2 /* */ | |
| 3 /* ftsynth.c */ | |
| 4 /* */ | |
| 5 /* FreeType synthesizing code for emboldening and slanting (body). */ | |
| 6 /* */ | |
| 7 /* Copyright 2000-2006, 2010, 2012 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 "../../include/ft2build.h" | |
| 20 #include "../../include/freetype/ftsynth.h" | |
| 21 #include "../../include/freetype/internal/ftdebug.h" | |
| 22 #include "../../include/freetype/internal/ftobjs.h" | |
| 23 #include "../../include/freetype/ftoutln.h" | |
| 24 #include "../../include/freetype/ftbitmap.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 | |
| 147 /* XXX: 16-bit overflow case must be excluded before here */ | |
| 148 if ( slot->format == FT_GLYPH_FORMAT_BITMAP ) | |
| 149 slot->bitmap_top += (FT_Int)( ystr >> 6 ); | |
| 150 } | |
| 151 | |
| 152 | |
| 153 /* END */ | |
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Chromium Code Reviews
Issue 815103002:
Update freetype to 2.5.4. (Closed)
Base URL: https://pdfium.googlesource.com/pdfium.git@master