XFA: merge patch from CL 817753002
[pdfium.git] / core / src / fxge / fx_freetype / fxft2.5.01 / include / freetype / ftglyph.h
1 /***************************************************************************/
2 /*                                                                         */
3 /*  ftglyph.h                                                              */
4 /*                                                                         */
5 /*    FreeType convenience functions to handle glyphs (specification).     */
6 /*                                                                         */
7 /*  Copyright 1996-2003, 2006, 2008, 2009, 2011 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   /*************************************************************************/
20   /*                                                                       */
21   /* This file contains the definition of several convenience functions    */
22   /* that can be used by client applications to easily retrieve glyph      */
23   /* bitmaps and outlines from a given face.                               */
24   /*                                                                       */
25   /* These functions should be optional if you are writing a font server   */
26   /* or text layout engine on top of FreeType.  However, they are pretty   */
27   /* handy for many other simple uses of the library.                      */
28   /*                                                                       */
29   /*************************************************************************/
30
31
32 #ifndef __FTGLYPH_H__
33 #define __FTGLYPH_H__
34
35
36 #include "../ft2build.h"
37 #include "freetype.h"
38
39 #ifdef FREETYPE_H
40 #error "freetype.h of FreeType 1 has been loaded!"
41 #error "Please fix the directory search order for header files"
42 #error "so that freetype.h of FreeType 2 is found first."
43 #endif
44
45
46 FT_BEGIN_HEADER
47
48
49   /*************************************************************************/
50   /*                                                                       */
51   /* <Section>                                                             */
52   /*    glyph_management                                                   */
53   /*                                                                       */
54   /* <Title>                                                               */
55   /*    Glyph Management                                                   */
56   /*                                                                       */
57   /* <Abstract>                                                            */
58   /*    Generic interface to manage individual glyph data.                 */
59   /*                                                                       */
60   /* <Description>                                                         */
61   /*    This section contains definitions used to manage glyph data        */
62   /*    through generic FT_Glyph objects.  Each of them can contain a      */
63   /*    bitmap, a vector outline, or even images in other formats.         */
64   /*                                                                       */
65   /*************************************************************************/
66
67
68   /* forward declaration to a private type */
69   typedef struct FT_Glyph_Class_  FT_Glyph_Class;
70
71
72   /*************************************************************************/
73   /*                                                                       */
74   /* <Type>                                                                */
75   /*    FT_Glyph                                                           */
76   /*                                                                       */
77   /* <Description>                                                         */
78   /*    Handle to an object used to model generic glyph images.  It is a   */
79   /*    pointer to the @FT_GlyphRec structure and can contain a glyph      */
80   /*    bitmap or pointer.                                                 */
81   /*                                                                       */
82   /* <Note>                                                                */
83   /*    Glyph objects are not owned by the library.  You must thus release */
84   /*    them manually (through @FT_Done_Glyph) _before_ calling            */
85   /*    @FT_Done_FreeType.                                                 */
86   /*                                                                       */
87   typedef struct FT_GlyphRec_*  FT_Glyph;
88
89
90   /*************************************************************************/
91   /*                                                                       */
92   /* <Struct>                                                              */
93   /*    FT_GlyphRec                                                        */
94   /*                                                                       */
95   /* <Description>                                                         */
96   /*    The root glyph structure contains a given glyph image plus its     */
97   /*    advance width in 16.16 fixed-point format.                         */
98   /*                                                                       */
99   /* <Fields>                                                              */
100   /*    library :: A handle to the FreeType library object.                */
101   /*                                                                       */
102   /*    clazz   :: A pointer to the glyph's class.  Private.               */
103   /*                                                                       */
104   /*    format  :: The format of the glyph's image.                        */
105   /*                                                                       */
106   /*    advance :: A 16.16 vector that gives the glyph's advance width.    */
107   /*                                                                       */
108   typedef struct  FT_GlyphRec_
109   {
110     FT_Library             library;
111     const FT_Glyph_Class*  clazz;
112     FT_Glyph_Format        format;
113     FT_Vector              advance;
114
115   } FT_GlyphRec;
116
117
118   /*************************************************************************/
119   /*                                                                       */
120   /* <Type>                                                                */
121   /*    FT_BitmapGlyph                                                     */
122   /*                                                                       */
123   /* <Description>                                                         */
124   /*    A handle to an object used to model a bitmap glyph image.  This is */
125   /*    a sub-class of @FT_Glyph, and a pointer to @FT_BitmapGlyphRec.     */
126   /*                                                                       */
127   typedef struct FT_BitmapGlyphRec_*  FT_BitmapGlyph;
128
129
130   /*************************************************************************/
131   /*                                                                       */
132   /* <Struct>                                                              */
133   /*    FT_BitmapGlyphRec                                                  */
134   /*                                                                       */
135   /* <Description>                                                         */
136   /*    A structure used for bitmap glyph images.  This really is a        */
137   /*    `sub-class' of @FT_GlyphRec.                                       */
138   /*                                                                       */
139   /* <Fields>                                                              */
140   /*    root   :: The root @FT_Glyph fields.                               */
141   /*                                                                       */
142   /*    left   :: The left-side bearing, i.e., the horizontal distance     */
143   /*              from the current pen position to the left border of the  */
144   /*              glyph bitmap.                                            */
145   /*                                                                       */
146   /*    top    :: The top-side bearing, i.e., the vertical distance from   */
147   /*              the current pen position to the top border of the glyph  */
148   /*              bitmap.  This distance is positive for upwards~y!        */
149   /*                                                                       */
150   /*    bitmap :: A descriptor for the bitmap.                             */
151   /*                                                                       */
152   /* <Note>                                                                */
153   /*    You can typecast an @FT_Glyph to @FT_BitmapGlyph if you have       */
154   /*    `glyph->format == FT_GLYPH_FORMAT_BITMAP'.  This lets you access   */
155   /*    the bitmap's contents easily.                                      */
156   /*                                                                       */
157   /*    The corresponding pixel buffer is always owned by @FT_BitmapGlyph  */
158   /*    and is thus created and destroyed with it.                         */
159   /*                                                                       */
160   typedef struct  FT_BitmapGlyphRec_
161   {
162     FT_GlyphRec  root;
163     FT_Int       left;
164     FT_Int       top;
165     FT_Bitmap    bitmap;
166
167   } FT_BitmapGlyphRec;
168
169
170   /*************************************************************************/
171   /*                                                                       */
172   /* <Type>                                                                */
173   /*    FT_OutlineGlyph                                                    */
174   /*                                                                       */
175   /* <Description>                                                         */
176   /*    A handle to an object used to model an outline glyph image.  This  */
177   /*    is a sub-class of @FT_Glyph, and a pointer to @FT_OutlineGlyphRec. */
178   /*                                                                       */
179   typedef struct FT_OutlineGlyphRec_*  FT_OutlineGlyph;
180
181
182   /*************************************************************************/
183   /*                                                                       */
184   /* <Struct>                                                              */
185   /*    FT_OutlineGlyphRec                                                 */
186   /*                                                                       */
187   /* <Description>                                                         */
188   /*    A structure used for outline (vectorial) glyph images.  This       */
189   /*    really is a `sub-class' of @FT_GlyphRec.                           */
190   /*                                                                       */
191   /* <Fields>                                                              */
192   /*    root    :: The root @FT_Glyph fields.                              */
193   /*                                                                       */
194   /*    outline :: A descriptor for the outline.                           */
195   /*                                                                       */
196   /* <Note>                                                                */
197   /*    You can typecast an @FT_Glyph to @FT_OutlineGlyph if you have      */
198   /*    `glyph->format == FT_GLYPH_FORMAT_OUTLINE'.  This lets you access  */
199   /*    the outline's content easily.                                      */
200   /*                                                                       */
201   /*    As the outline is extracted from a glyph slot, its coordinates are */
202   /*    expressed normally in 26.6 pixels, unless the flag                 */
203   /*    @FT_LOAD_NO_SCALE was used in @FT_Load_Glyph() or @FT_Load_Char(). */
204   /*                                                                       */
205   /*    The outline's tables are always owned by the object and are        */
206   /*    destroyed with it.                                                 */
207   /*                                                                       */
208   typedef struct  FT_OutlineGlyphRec_
209   {
210     FT_GlyphRec  root;
211     FT_Outline   outline;
212
213   } FT_OutlineGlyphRec;
214
215
216   /*************************************************************************/
217   /*                                                                       */
218   /* <Function>                                                            */
219   /*    FT_Get_Glyph                                                       */
220   /*                                                                       */
221   /* <Description>                                                         */
222   /*    A function used to extract a glyph image from a slot.  Note that   */
223   /*    the created @FT_Glyph object must be released with @FT_Done_Glyph. */
224   /*                                                                       */
225   /* <Input>                                                               */
226   /*    slot   :: A handle to the source glyph slot.                       */
227   /*                                                                       */
228   /* <Output>                                                              */
229   /*    aglyph :: A handle to the glyph object.                            */
230   /*                                                                       */
231   /* <Return>                                                              */
232   /*    FreeType error code.  0~means success.                             */
233   /*                                                                       */
234   FT_EXPORT( FT_Error )
235   FT_Get_Glyph( FT_GlyphSlot  slot,
236                 FT_Glyph     *aglyph );
237
238
239   /*************************************************************************/
240   /*                                                                       */
241   /* <Function>                                                            */
242   /*    FT_Glyph_Copy                                                      */
243   /*                                                                       */
244   /* <Description>                                                         */
245   /*    A function used to copy a glyph image.  Note that the created      */
246   /*    @FT_Glyph object must be released with @FT_Done_Glyph.             */
247   /*                                                                       */
248   /* <Input>                                                               */
249   /*    source :: A handle to the source glyph object.                     */
250   /*                                                                       */
251   /* <Output>                                                              */
252   /*    target :: A handle to the target glyph object.  0~in case of       */
253   /*              error.                                                   */
254   /*                                                                       */
255   /* <Return>                                                              */
256   /*    FreeType error code.  0~means success.                             */
257   /*                                                                       */
258   FT_EXPORT( FT_Error )
259   FT_Glyph_Copy( FT_Glyph   source,
260                  FT_Glyph  *target );
261
262
263   /*************************************************************************/
264   /*                                                                       */
265   /* <Function>                                                            */
266   /*    FT_Glyph_Transform                                                 */
267   /*                                                                       */
268   /* <Description>                                                         */
269   /*    Transform a glyph image if its format is scalable.                 */
270   /*                                                                       */
271   /* <InOut>                                                               */
272   /*    glyph  :: A handle to the target glyph object.                     */
273   /*                                                                       */
274   /* <Input>                                                               */
275   /*    matrix :: A pointer to a 2x2 matrix to apply.                      */
276   /*                                                                       */
277   /*    delta  :: A pointer to a 2d vector to apply.  Coordinates are      */
278   /*              expressed in 1/64th of a pixel.                          */
279   /*                                                                       */
280   /* <Return>                                                              */
281   /*    FreeType error code (if not 0, the glyph format is not scalable).  */
282   /*                                                                       */
283   /* <Note>                                                                */
284   /*    The 2x2 transformation matrix is also applied to the glyph's       */
285   /*    advance vector.                                                    */
286   /*                                                                       */
287   FT_EXPORT( FT_Error )
288   FT_Glyph_Transform( FT_Glyph    glyph,
289                       FT_Matrix*  matrix,
290                       FT_Vector*  delta );
291
292
293   /*************************************************************************/
294   /*                                                                       */
295   /* <Enum>                                                                */
296   /*    FT_Glyph_BBox_Mode                                                 */
297   /*                                                                       */
298   /* <Description>                                                         */
299   /*    The mode how the values of @FT_Glyph_Get_CBox are returned.        */
300   /*                                                                       */
301   /* <Values>                                                              */
302   /*    FT_GLYPH_BBOX_UNSCALED ::                                          */
303   /*      Return unscaled font units.                                      */
304   /*                                                                       */
305   /*    FT_GLYPH_BBOX_SUBPIXELS ::                                         */
306   /*      Return unfitted 26.6 coordinates.                                */
307   /*                                                                       */
308   /*    FT_GLYPH_BBOX_GRIDFIT ::                                           */
309   /*      Return grid-fitted 26.6 coordinates.                             */
310   /*                                                                       */
311   /*    FT_GLYPH_BBOX_TRUNCATE ::                                          */
312   /*      Return coordinates in integer pixels.                            */
313   /*                                                                       */
314   /*    FT_GLYPH_BBOX_PIXELS ::                                            */
315   /*      Return grid-fitted pixel coordinates.                            */
316   /*                                                                       */
317   typedef enum  FT_Glyph_BBox_Mode_
318   {
319     FT_GLYPH_BBOX_UNSCALED  = 0,
320     FT_GLYPH_BBOX_SUBPIXELS = 0,
321     FT_GLYPH_BBOX_GRIDFIT   = 1,
322     FT_GLYPH_BBOX_TRUNCATE  = 2,
323     FT_GLYPH_BBOX_PIXELS    = 3
324
325   } FT_Glyph_BBox_Mode;
326
327
328   /*************************************************************************/
329   /*                                                                       */
330   /* <Enum>                                                                */
331   /*    ft_glyph_bbox_xxx                                                  */
332   /*                                                                       */
333   /* <Description>                                                         */
334   /*    These constants are deprecated.  Use the corresponding             */
335   /*    @FT_Glyph_BBox_Mode values instead.                                */
336   /*                                                                       */
337   /* <Values>                                                              */
338   /*   ft_glyph_bbox_unscaled  :: See @FT_GLYPH_BBOX_UNSCALED.             */
339   /*   ft_glyph_bbox_subpixels :: See @FT_GLYPH_BBOX_SUBPIXELS.            */
340   /*   ft_glyph_bbox_gridfit   :: See @FT_GLYPH_BBOX_GRIDFIT.              */
341   /*   ft_glyph_bbox_truncate  :: See @FT_GLYPH_BBOX_TRUNCATE.             */
342   /*   ft_glyph_bbox_pixels    :: See @FT_GLYPH_BBOX_PIXELS.               */
343   /*                                                                       */
344 #define ft_glyph_bbox_unscaled   FT_GLYPH_BBOX_UNSCALED
345 #define ft_glyph_bbox_subpixels  FT_GLYPH_BBOX_SUBPIXELS
346 #define ft_glyph_bbox_gridfit    FT_GLYPH_BBOX_GRIDFIT
347 #define ft_glyph_bbox_truncate   FT_GLYPH_BBOX_TRUNCATE
348 #define ft_glyph_bbox_pixels     FT_GLYPH_BBOX_PIXELS
349
350
351   /*************************************************************************/
352   /*                                                                       */
353   /* <Function>                                                            */
354   /*    FT_Glyph_Get_CBox                                                  */
355   /*                                                                       */
356   /* <Description>                                                         */
357   /*    Return a glyph's `control box'.  The control box encloses all the  */
358   /*    outline's points, including Bézier control points.  Though it      */
359   /*    coincides with the exact bounding box for most glyphs, it can be   */
360   /*    slightly larger in some situations (like when rotating an outline  */
361   /*    which contains Bézier outside arcs).                               */
362   /*                                                                       */
363   /*    Computing the control box is very fast, while getting the bounding */
364   /*    box can take much more time as it needs to walk over all segments  */
365   /*    and arcs in the outline.  To get the latter, you can use the       */
366   /*    `ftbbox' component which is dedicated to this single task.         */
367   /*                                                                       */
368   /* <Input>                                                               */
369   /*    glyph :: A handle to the source glyph object.                      */
370   /*                                                                       */
371   /*    mode  :: The mode which indicates how to interpret the returned    */
372   /*             bounding box values.                                      */
373   /*                                                                       */
374   /* <Output>                                                              */
375   /*    acbox :: The glyph coordinate bounding box.  Coordinates are       */
376   /*             expressed in 1/64th of pixels if it is grid-fitted.       */
377   /*                                                                       */
378   /* <Note>                                                                */
379   /*    Coordinates are relative to the glyph origin, using the y~upwards  */
380   /*    convention.                                                        */
381   /*                                                                       */
382   /*    If the glyph has been loaded with @FT_LOAD_NO_SCALE, `bbox_mode'   */
383   /*    must be set to @FT_GLYPH_BBOX_UNSCALED to get unscaled font        */
384   /*    units in 26.6 pixel format.  The value @FT_GLYPH_BBOX_SUBPIXELS    */
385   /*    is another name for this constant.                                 */
386   /*                                                                       */
387   /*    If the font is tricky and the glyph has been loaded with           */
388   /*    @FT_LOAD_NO_SCALE, the resulting CBox is meaningless.  To get      */
389   /*    reasonable values for the CBox it is necessary to load the glyph   */
390   /*    at a large ppem value (so that the hinting instructions can        */
391   /*    properly shift and scale the subglyphs), then extracting the CBox  */
392   /*    which can be eventually converted back to font units.              */
393   /*                                                                       */
394   /*    Note that the maximum coordinates are exclusive, which means that  */
395   /*    one can compute the width and height of the glyph image (be it in  */
396   /*    integer or 26.6 pixels) as:                                        */
397   /*                                                                       */
398   /*    {                                                                  */
399   /*      width  = bbox.xMax - bbox.xMin;                                  */
400   /*      height = bbox.yMax - bbox.yMin;                                  */
401   /*    }                                                                  */
402   /*                                                                       */
403   /*    Note also that for 26.6 coordinates, if `bbox_mode' is set to      */
404   /*    @FT_GLYPH_BBOX_GRIDFIT, the coordinates will also be grid-fitted,  */
405   /*    which corresponds to:                                              */
406   /*                                                                       */
407   /*    {                                                                  */
408   /*      bbox.xMin = FLOOR(bbox.xMin);                                    */
409   /*      bbox.yMin = FLOOR(bbox.yMin);                                    */
410   /*      bbox.xMax = CEILING(bbox.xMax);                                  */
411   /*      bbox.yMax = CEILING(bbox.yMax);                                  */
412   /*    }                                                                  */
413   /*                                                                       */
414   /*    To get the bbox in pixel coordinates, set `bbox_mode' to           */
415   /*    @FT_GLYPH_BBOX_TRUNCATE.                                           */
416   /*                                                                       */
417   /*    To get the bbox in grid-fitted pixel coordinates, set `bbox_mode'  */
418   /*    to @FT_GLYPH_BBOX_PIXELS.                                          */
419   /*                                                                       */
420   FT_EXPORT( void )
421   FT_Glyph_Get_CBox( FT_Glyph  glyph,
422                      FT_UInt   bbox_mode,
423                      FT_BBox  *acbox );
424
425
426   /*************************************************************************/
427   /*                                                                       */
428   /* <Function>                                                            */
429   /*    FT_Glyph_To_Bitmap                                                 */
430   /*                                                                       */
431   /* <Description>                                                         */
432   /*    Convert a given glyph object to a bitmap glyph object.             */
433   /*                                                                       */
434   /* <InOut>                                                               */
435   /*    the_glyph   :: A pointer to a handle to the target glyph.          */
436   /*                                                                       */
437   /* <Input>                                                               */
438   /*    render_mode :: An enumeration that describes how the data is       */
439   /*                   rendered.                                           */
440   /*                                                                       */
441   /*    origin      :: A pointer to a vector used to translate the glyph   */
442   /*                   image before rendering.  Can be~0 (if no            */
443   /*                   translation).  The origin is expressed in           */
444   /*                   26.6 pixels.                                        */
445   /*                                                                       */
446   /*    destroy     :: A boolean that indicates that the original glyph    */
447   /*                   image should be destroyed by this function.  It is  */
448   /*                   never destroyed in case of error.                   */
449   /*                                                                       */
450   /* <Return>                                                              */
451   /*    FreeType error code.  0~means success.                             */
452   /*                                                                       */
453   /* <Note>                                                                */
454   /*    This function does nothing if the glyph format isn't scalable.     */
455   /*                                                                       */
456   /*    The glyph image is translated with the `origin' vector before      */
457   /*    rendering.                                                         */
458   /*                                                                       */
459   /*    The first parameter is a pointer to an @FT_Glyph handle, that will */
460   /*    be _replaced_ by this function (with newly allocated data).        */
461   /*    Typically, you would use (omitting error handling):                */
462   /*                                                                       */
463   /*                                                                       */
464   /*      {                                                                */
465   /*        FT_Glyph        glyph;                                         */
466   /*        FT_BitmapGlyph  glyph_bitmap;                                  */
467   /*                                                                       */
468   /*                                                                       */
469   /*        // load glyph                                                  */
470   /*        error = FT_Load_Char( face, glyph_index, FT_LOAD_DEFAUT );     */
471   /*                                                                       */
472   /*        // extract glyph image                                         */
473   /*        error = FT_Get_Glyph( face->glyph, &glyph );                   */
474   /*                                                                       */
475   /*        // convert to a bitmap (default render mode + destroying old)  */
476   /*        if ( glyph->format != FT_GLYPH_FORMAT_BITMAP )                 */
477   /*        {                                                              */
478   /*          error = FT_Glyph_To_Bitmap( &glyph, FT_RENDER_MODE_NORMAL,   */
479   /*                                      0, 1 );                          */
480   /*          if ( error ) // `glyph' unchanged                            */
481   /*            ...                                                        */
482   /*        }                                                              */
483   /*                                                                       */
484   /*        // access bitmap content by typecasting                        */
485   /*        glyph_bitmap = (FT_BitmapGlyph)glyph;                          */
486   /*                                                                       */
487   /*        // do funny stuff with it, like blitting/drawing               */
488   /*        ...                                                            */
489   /*                                                                       */
490   /*        // discard glyph image (bitmap or not)                         */
491   /*        FT_Done_Glyph( glyph );                                        */
492   /*      }                                                                */
493   /*                                                                       */
494   /*                                                                       */
495   /*    Here another example, again without error handling:                */
496   /*                                                                       */
497   /*                                                                       */
498   /*      {                                                                */
499   /*        FT_Glyph  glyphs[MAX_GLYPHS]                                   */
500   /*                                                                       */
501   /*                                                                       */
502   /*        ...                                                            */
503   /*                                                                       */
504   /*        for ( idx = 0; i < MAX_GLYPHS; i++ )                           */
505   /*          error = FT_Load_Glyph( face, idx, FT_LOAD_DEFAULT ) ||       */
506   /*                  FT_Get_Glyph ( face->glyph, &glyph[idx] );           */
507   /*                                                                       */
508   /*        ...                                                            */
509   /*                                                                       */
510   /*        for ( idx = 0; i < MAX_GLYPHS; i++ )                           */
511   /*        {                                                              */
512   /*          FT_Glyph  bitmap = glyphs[idx];                              */
513   /*                                                                       */
514   /*                                                                       */
515   /*          ...                                                          */
516   /*                                                                       */
517   /*          // after this call, `bitmap' no longer points into           */
518   /*          // the `glyphs' array (and the old value isn't destroyed)    */
519   /*          FT_Glyph_To_Bitmap( &bitmap, FT_RENDER_MODE_MONO, 0, 0 );    */
520   /*                                                                       */
521   /*          ...                                                          */
522   /*                                                                       */
523   /*          FT_Done_Glyph( bitmap );                                     */
524   /*        }                                                              */
525   /*                                                                       */
526   /*        ...                                                            */
527   /*                                                                       */
528   /*        for ( idx = 0; i < MAX_GLYPHS; i++ )                           */
529   /*          FT_Done_Glyph( glyphs[idx] );                                */
530   /*      }                                                                */
531   /*                                                                       */
532   FT_EXPORT( FT_Error )
533   FT_Glyph_To_Bitmap( FT_Glyph*       the_glyph,
534                       FT_Render_Mode  render_mode,
535                       FT_Vector*      origin,
536                       FT_Bool         destroy );
537
538
539   /*************************************************************************/
540   /*                                                                       */
541   /* <Function>                                                            */
542   /*    FT_Done_Glyph                                                      */
543   /*                                                                       */
544   /* <Description>                                                         */
545   /*    Destroy a given glyph.                                             */
546   /*                                                                       */
547   /* <Input>                                                               */
548   /*    glyph :: A handle to the target glyph object.                      */
549   /*                                                                       */
550   FT_EXPORT( void )
551   FT_Done_Glyph( FT_Glyph  glyph );
552
553   /* */
554
555
556   /* other helpful functions */
557
558   /*************************************************************************/
559   /*                                                                       */
560   /* <Section>                                                             */
561   /*    computations                                                       */
562   /*                                                                       */
563   /*************************************************************************/
564
565
566   /*************************************************************************/
567   /*                                                                       */
568   /* <Function>                                                            */
569   /*    FT_Matrix_Multiply                                                 */
570   /*                                                                       */
571   /* <Description>                                                         */
572   /*    Perform the matrix operation `b = a*b'.                            */
573   /*                                                                       */
574   /* <Input>                                                               */
575   /*    a :: A pointer to matrix `a'.                                      */
576   /*                                                                       */
577   /* <InOut>                                                               */
578   /*    b :: A pointer to matrix `b'.                                      */
579   /*                                                                       */
580   /* <Note>                                                                */
581   /*    The result is undefined if either `a' or `b' is zero.              */
582   /*                                                                       */
583   FT_EXPORT( void )
584   FT_Matrix_Multiply( const FT_Matrix*  a,
585                       FT_Matrix*        b );
586
587
588   /*************************************************************************/
589   /*                                                                       */
590   /* <Function>                                                            */
591   /*    FT_Matrix_Invert                                                   */
592   /*                                                                       */
593   /* <Description>                                                         */
594   /*    Invert a 2x2 matrix.  Return an error if it can't be inverted.     */
595   /*                                                                       */
596   /* <InOut>                                                               */
597   /*    matrix :: A pointer to the target matrix.  Remains untouched in    */
598   /*              case of error.                                           */
599   /*                                                                       */
600   /* <Return>                                                              */
601   /*    FreeType error code.  0~means success.                             */
602   /*                                                                       */
603   FT_EXPORT( FT_Error )
604   FT_Matrix_Invert( FT_Matrix*  matrix );
605
606
607   /* */
608
609
610 FT_END_HEADER
611
612 #endif /* __FTGLYPH_H__ */
613
614
615 /* END */
616
617
618 /* Local Variables: */
619 /* coding: utf-8    */
620 /* End:             */