1 /***************************************************************************/
5 /* FreeType synthesizing code for emboldening and slanting (body). */
7 /* Copyright 2000-2001, 2002, 2003, 2004, 2005, 2006, 2010 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
36 /*************************************************************************/
37 /*************************************************************************/
39 /**** EXPERIMENTAL OBLIQUING SUPPORT ****/
41 /*************************************************************************/
42 /*************************************************************************/
44 /* documentation is in ftsynth.h */
47 FT_GlyphSlot_Oblique( FT_GlyphSlot slot )
50 FT_Outline* outline = &slot->outline;
53 /* only oblique outline glyphs */
54 if ( slot->format != FT_GLYPH_FORMAT_OUTLINE )
57 /* we don't touch the advance width */
59 /* For italic, simply apply a shear transform, with an angle */
60 /* of about 12 degrees. */
62 transform.xx = 0x10000L;
63 transform.yx = 0x00000L;
65 transform.xy = 0x06000L;
66 transform.yy = 0x10000L;
68 FT_Outline_Transform( outline, &transform );
72 /*************************************************************************/
73 /*************************************************************************/
75 /**** EXPERIMENTAL EMBOLDENING/OUTLINING SUPPORT ****/
77 /*************************************************************************/
78 /*************************************************************************/
81 /* documentation is in ftsynth.h */
84 FT_GlyphSlot_Embolden( FT_GlyphSlot slot )
86 FT_Library library = slot->library;
87 FT_Face face = slot->face;
92 if ( slot->format != FT_GLYPH_FORMAT_OUTLINE &&
93 slot->format != FT_GLYPH_FORMAT_BITMAP )
96 /* some reasonable strength */
97 xstr = FT_MulFix( face->units_per_EM,
98 face->size->metrics.y_scale ) / 24;
101 if ( slot->format == FT_GLYPH_FORMAT_OUTLINE )
104 (void)FT_Outline_Embolden( &slot->outline, xstr );
106 /* this is more than enough for most glyphs; if you need accurate */
107 /* values, you have to call FT_Outline_Get_CBox */
111 else /* slot->format == FT_GLYPH_FORMAT_BITMAP */
113 /* round to full pixels */
120 * XXX: overflow check for 16-bit system, for compatibility
121 * with FT_GlyphSlot_Embolden() since freetype-2.1.10.
122 * unfortunately, this function return no informations
123 * about the cause of error.
125 if ( ( ystr >> 6 ) > FT_INT_MAX || ( ystr >> 6 ) < FT_INT_MIN )
127 FT_TRACE1(( "FT_GlyphSlot_Embolden:" ));
128 FT_TRACE1(( "too strong embolding parameter ystr=%d\n", ystr ));
131 error = FT_GlyphSlot_Own_Bitmap( slot );
135 error = FT_Bitmap_Embolden( library, &slot->bitmap, xstr, ystr );
140 if ( slot->advance.x )
141 slot->advance.x += xstr;
143 if ( slot->advance.y )
144 slot->advance.y += ystr;
146 slot->metrics.width += xstr;
147 slot->metrics.height += ystr;
148 slot->metrics.horiBearingY += ystr;
149 slot->metrics.horiAdvance += xstr;
150 slot->metrics.vertBearingX -= xstr / 2;
151 slot->metrics.vertBearingY += ystr;
152 slot->metrics.vertAdvance += ystr;
154 /* XXX: 16-bit overflow case must be excluded before here */
155 if ( slot->format == FT_GLYPH_FORMAT_BITMAP )
156 slot->bitmap_top += (FT_Int)( ystr >> 6 );