1 /***************************************************************************/
5 /* FreeType synthesizing code for emboldening and slanting (body). */
7 /* Copyright 2000-2018 by */
8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
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. */
16 /***************************************************************************/
20 #include FT_SYNTHESIS_H
21 #include FT_INTERNAL_DEBUG_H
22 #include FT_INTERNAL_OBJECTS_H
27 /*************************************************************************/
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. */
34 #define FT_COMPONENT trace_synth
37 /*************************************************************************/
38 /*************************************************************************/
40 /**** EXPERIMENTAL OBLIQUING SUPPORT ****/
42 /*************************************************************************/
43 /*************************************************************************/
45 /* documentation is in ftsynth.h */
48 FT_GlyphSlot_Oblique( FT_GlyphSlot slot
)
57 outline
= &slot
->outline
;
59 /* only oblique outline glyphs */
60 if ( slot
->format
!= FT_GLYPH_FORMAT_OUTLINE
)
63 /* we don't touch the advance width */
65 /* For italic, simply apply a shear transform, with an angle */
66 /* of about 12 degrees. */
68 transform
.xx
= 0x10000L
;
69 transform
.yx
= 0x00000L
;
71 transform
.xy
= 0x0366AL
;
72 transform
.yy
= 0x10000L
;
74 FT_Outline_Transform( outline
, &transform
);
78 /*************************************************************************/
79 /*************************************************************************/
81 /**** EXPERIMENTAL EMBOLDENING SUPPORT ****/
83 /*************************************************************************/
84 /*************************************************************************/
87 /* documentation is in ftsynth.h */
90 FT_GlyphSlot_Embolden( FT_GlyphSlot slot
)
101 library
= slot
->library
;
104 if ( slot
->format
!= FT_GLYPH_FORMAT_OUTLINE
&&
105 slot
->format
!= FT_GLYPH_FORMAT_BITMAP
)
108 /* some reasonable strength */
109 xstr
= FT_MulFix( face
->units_per_EM
,
110 face
->size
->metrics
.y_scale
) / 24;
113 if ( slot
->format
== FT_GLYPH_FORMAT_OUTLINE
)
114 FT_Outline_EmboldenXY( &slot
->outline
, xstr
, ystr
);
116 else /* slot->format == FT_GLYPH_FORMAT_BITMAP */
118 /* round to full pixels */
125 * XXX: overflow check for 16-bit system, for compatibility
126 * with FT_GlyphSlot_Embolden() since FreeType 2.1.10.
127 * unfortunately, this function return no informations
128 * about the cause of error.
130 if ( ( ystr
>> 6 ) > FT_INT_MAX
|| ( ystr
>> 6 ) < FT_INT_MIN
)
132 FT_TRACE1(( "FT_GlyphSlot_Embolden:" ));
133 FT_TRACE1(( "too strong emboldening parameter ystr=%d\n", ystr
));
136 error
= FT_GlyphSlot_Own_Bitmap( slot
);
140 error
= FT_Bitmap_Embolden( library
, &slot
->bitmap
, xstr
, ystr
);
145 if ( slot
->advance
.x
)
146 slot
->advance
.x
+= xstr
;
148 if ( slot
->advance
.y
)
149 slot
->advance
.y
+= ystr
;
151 slot
->metrics
.width
+= xstr
;
152 slot
->metrics
.height
+= ystr
;
153 slot
->metrics
.horiAdvance
+= xstr
;
154 slot
->metrics
.vertAdvance
+= ystr
;
155 slot
->metrics
.horiBearingY
+= ystr
;
157 /* XXX: 16-bit overflow case must be excluded before here */
158 if ( slot
->format
== FT_GLYPH_FORMAT_BITMAP
)
159 slot
->bitmap_top
+= (FT_Int
)( ystr
>> 6 );