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/src/freetype/include/freetype/ftglyph.h

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  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 FT_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
 46FT_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 float 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
610FT_END_HEADER
611
612#endif /* __FTGLYPH_H__ */
613
614
615/* END */
616
617
618/* Local Variables: */
619/* coding: utf-8    */
620/* End:             */