ReactOS  0.4.13-dev-651-g5dbc677
ftsynth.c
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1 /***************************************************************************/
2 /* */
3 /* ftsynth.c */
4 /* */
5 /* FreeType synthesizing code for emboldening and slanting (body). */
6 /* */
7 /* Copyright 2000-2018 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 )
49  {
52 
53 
54  if ( !slot )
55  return;
56 
57  outline = &slot->outline;
58 
59  /* only oblique outline glyphs */
60  if ( slot->format != FT_GLYPH_FORMAT_OUTLINE )
61  return;
62 
63  /* we don't touch the advance width */
64 
65  /* For italic, simply apply a shear transform, with an angle */
66  /* of about 12 degrees. */
67 
68  transform.xx = 0x10000L;
69  transform.yx = 0x00000L;
70 
71  transform.xy = 0x0366AL;
72  transform.yy = 0x10000L;
73 
75  }
76 
77 
78  /*************************************************************************/
79  /*************************************************************************/
80  /**** ****/
81  /**** EXPERIMENTAL EMBOLDENING SUPPORT ****/
82  /**** ****/
83  /*************************************************************************/
84  /*************************************************************************/
85 
86 
87  /* documentation is in ftsynth.h */
88 
89  FT_EXPORT_DEF( void )
91  {
93  FT_Face face;
95  FT_Pos xstr, ystr;
96 
97 
98  if ( !slot )
99  return;
100 
101  library = slot->library;
102  face = slot->face;
103 
104  if ( slot->format != FT_GLYPH_FORMAT_OUTLINE &&
105  slot->format != FT_GLYPH_FORMAT_BITMAP )
106  return;
107 
108  /* some reasonable strength */
109  xstr = FT_MulFix( face->units_per_EM,
110  face->size->metrics.y_scale ) / 24;
111  ystr = xstr;
112 
113  if ( slot->format == FT_GLYPH_FORMAT_OUTLINE )
114  FT_Outline_EmboldenXY( &slot->outline, xstr, ystr );
115 
116  else /* slot->format == FT_GLYPH_FORMAT_BITMAP */
117  {
118  /* round to full pixels */
119  xstr &= ~63;
120  if ( xstr == 0 )
121  xstr = 1 << 6;
122  ystr &= ~63;
123 
124  /*
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.
129  */
130  if ( ( ystr >> 6 ) > FT_INT_MAX || ( ystr >> 6 ) < FT_INT_MIN )
131  {
132  FT_TRACE1(( "FT_GlyphSlot_Embolden:" ));
133  FT_TRACE1(( "too strong emboldening parameter ystr=%d\n", ystr ));
134  return;
135  }
137  if ( error )
138  return;
139 
140  error = FT_Bitmap_Embolden( library, &slot->bitmap, xstr, ystr );
141  if ( error )
142  return;
143  }
144 
145  if ( slot->advance.x )
146  slot->advance.x += xstr;
147 
148  if ( slot->advance.y )
149  slot->advance.y += ystr;
150 
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;
156 
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 );
160  }
161 
162 
163 /* END */
int FT_Error
Definition: fttypes.h:300
FT_BEGIN_HEADER typedef signed long FT_Pos
Definition: ftimage.h:58
FT_Bitmap_Embolden(FT_Library library, FT_Bitmap *bitmap, FT_Pos xStrength, FT_Pos yStrength)
Definition: ftbitmap.c:296
#define error(str)
Definition: mkdosfs.c:1605
signed int FT_Int
Definition: fttypes.h:220
WORD face[3]
Definition: mesh.c:4747
FT_Library library
Definition: cffdrivr.c:654
FT_GlyphSlot_Embolden(FT_GlyphSlot slot)
Definition: ftsynth.c:90
#define FT_TRACE1(varformat)
Definition: ftdebug.h:158
FT_GlyphSlot_Oblique(FT_GlyphSlot slot)
Definition: ftsynth.c:48
FT_Outline_Transform(const FT_Outline *outline, const FT_Matrix *matrix)
Definition: ftoutln.c:711
FT_GlyphSlot_Own_Bitmap(FT_GlyphSlot slot)
Definition: ftbitmap.c:801
smooth FT_Module_Constructor FT_Module_Destructor FT_Module_Requester FT_GLYPH_FORMAT_OUTLINE
Definition: ftsmooth.c:416
#define FT_INT_MIN
Definition: ftstdlib.h:64
FT_Outline_EmboldenXY(FT_Outline *outline, FT_Pos xstrength, FT_Pos ystrength)
Definition: ftoutln.c:909
static const WCHAR L[]
Definition: oid.c:1250
Definition: mesh.c:5329
FT_MulFix(FT_Long a, FT_Long b)
Definition: ftcalc.c:509
Definition: vfat.h:184
#define FT_EXPORT_DEF(x)
Definition: ftconfig.h:483
#define FT_INT_MAX
Definition: ftstdlib.h:63
GLuint GLenum GLenum transform
Definition: glext.h:9407
GLenum GLuint GLint GLenum face
Definition: glext.h:7025