Qt 4.8
qrasterdefs_p.h
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41 
42 /***************************************************************************/
43 /* */
44 /* ftimage.h */
45 /* */
46 /* FreeType glyph image formats and default raster interface */
47 /* (specification). */
48 /* */
49 /* Copyright 1996-2001, 2002, 2003, 2004 by */
50 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
51 /* */
52 /* This file is part of the FreeType project, and may only be used, */
53 /* modified, and distributed under the terms of the FreeType project */
54 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
55 /* this file you indicate that you have read the license and */
56 /* understand and accept it fully. */
57 /* */
58 /***************************************************************************/
59 
60  /*************************************************************************/
61  /* */
62  /* Note: A `raster' is simply a scan-line converter, used to render */
63  /* QT_FT_Outlines into QT_FT_Bitmaps. */
64  /* */
65  /*************************************************************************/
66 
67 
68 #ifndef __QT_FTIMAGE_H__
69 #define __QT_FTIMAGE_H__
70 
71 /*
72 // W A R N I N G
73 // -------------
74 //
75 // This file is not part of the Qt API. It exists purely as an
76 // implementation detail. This header file may change from version to
77 // version without notice, or even be removed.
78 //
79 // We mean it.
80 */
81 
82 QT_FT_BEGIN_HEADER
83 
84  /*************************************************************************/
85  /* */
86  /* <Section> */
87  /* basic_types */
88  /* */
89  /*************************************************************************/
90 
91 
92  /*************************************************************************/
93  /* */
94  /* <Type> */
95  /* QT_FT_Pos */
96  /* */
97  /* <Description> */
98  /* The type QT_FT_Pos is a 32-bit integer used to store vectorial */
99  /* coordinates. Depending on the context, these can represent */
100  /* distances in integer font units, or 16,16, or 26.6 fixed float */
101  /* pixel coordinates. */
102  /* */
103  typedef signed int QT_FT_Pos;
104 
105 
106  /*************************************************************************/
107  /* */
108  /* <Struct> */
109  /* QT_FT_Vector */
110  /* */
111  /* <Description> */
112  /* A simple structure used to store a 2D vector; coordinates are of */
113  /* the QT_FT_Pos type. */
114  /* */
115  /* <Fields> */
116  /* x :: The horizontal coordinate. */
117  /* y :: The vertical coordinate. */
118  /* */
119  typedef struct QT_FT_Vector_
120  {
121  QT_FT_Pos x;
122  QT_FT_Pos y;
123 
124  } QT_FT_Vector;
125 
126 
127  /*************************************************************************/
128  /* */
129  /* <Struct> */
130  /* QT_FT_BBox */
131  /* */
132  /* <Description> */
133  /* A structure used to hold an outline's bounding box, i.e., the */
134  /* coordinates of its extrema in the horizontal and vertical */
135  /* directions. */
136  /* */
137  /* <Fields> */
138  /* xMin :: The horizontal minimum (left-most). */
139  /* */
140  /* yMin :: The vertical minimum (bottom-most). */
141  /* */
142  /* xMax :: The horizontal maximum (right-most). */
143  /* */
144  /* yMax :: The vertical maximum (top-most). */
145  /* */
146  typedef struct QT_FT_BBox_
147  {
148  QT_FT_Pos xMin, yMin;
149  QT_FT_Pos xMax, yMax;
150 
151  } QT_FT_BBox;
152 
153 
154  /*************************************************************************/
155  /* */
156  /* <Enum> */
157  /* QT_FT_Pixel_Mode */
158  /* */
159  /* <Description> */
160  /* An enumeration type used to describe the format of pixels in a */
161  /* given bitmap. Note that additional formats may be added in the */
162  /* future. */
163  /* */
164  /* <Values> */
165  /* QT_FT_PIXEL_MODE_NONE :: */
166  /* Value 0 is reserved. */
167  /* */
168  /* QT_FT_PIXEL_MODE_MONO :: */
169  /* A monochrome bitmap, using 1 bit per pixel. Note that pixels */
170  /* are stored in most-significant order (MSB), which means that */
171  /* the left-most pixel in a byte has value 128. */
172  /* */
173  /* QT_FT_PIXEL_MODE_GRAY :: */
174  /* An 8-bit bitmap, generally used to represent anti-aliased glyph */
175  /* images. Each pixel is stored in one byte. Note that the number */
176  /* of value "gray" levels is stored in the `num_bytes' field of */
177  /* the @QT_FT_Bitmap structure (it generally is 256). */
178  /* */
179  /* QT_FT_PIXEL_MODE_GRAY2 :: */
180  /* A 2-bit/pixel bitmap, used to represent embedded anti-aliased */
181  /* bitmaps in font files according to the OpenType specification. */
182  /* We haven't found a single font using this format, however. */
183  /* */
184  /* QT_FT_PIXEL_MODE_GRAY4 :: */
185  /* A 4-bit/pixel bitmap, used to represent embedded anti-aliased */
186  /* bitmaps in font files according to the OpenType specification. */
187  /* We haven't found a single font using this format, however. */
188  /* */
189  /* QT_FT_PIXEL_MODE_LCD :: */
190  /* An 8-bit bitmap, used to represent RGB or BGR decimated glyph */
191  /* images used for display on LCD displays; the bitmap's width is */
192  /* three times wider than the original glyph image. See also */
193  /* @QT_FT_RENDER_MODE_LCD. */
194  /* */
195  /* QT_FT_PIXEL_MODE_LCD_V :: */
196  /* An 8-bit bitmap, used to represent RGB or BGR decimated glyph */
197  /* images used for display on rotated LCD displays; the bitmap's */
198  /* height is three times taller than the original glyph image. */
199  /* See also @QT_FT_RENDER_MODE_LCD_V. */
200  /* */
201  typedef enum QT_FT_Pixel_Mode_
202  {
203  QT_FT_PIXEL_MODE_NONE = 0,
204  QT_FT_PIXEL_MODE_MONO,
205  QT_FT_PIXEL_MODE_GRAY,
206  QT_FT_PIXEL_MODE_GRAY2,
207  QT_FT_PIXEL_MODE_GRAY4,
208  QT_FT_PIXEL_MODE_LCD,
209  QT_FT_PIXEL_MODE_LCD_V,
210 
211  QT_FT_PIXEL_MODE_MAX /* do not remove */
212 
213  } QT_FT_Pixel_Mode;
214 
215 
216  /*************************************************************************/
217  /* */
218  /* <Enum> */
219  /* qt_ft_pixel_mode_xxx */
220  /* */
221  /* <Description> */
222  /* A list of deprecated constants. Use the corresponding */
223  /* @QT_FT_Pixel_Mode values instead. */
224  /* */
225  /* <Values> */
226  /* qt_ft_pixel_mode_none :: see @QT_FT_PIXEL_MODE_NONE */
227  /* qt_ft_pixel_mode_mono :: see @QT_FT_PIXEL_MODE_MONO */
228  /* qt_ft_pixel_mode_grays :: see @QT_FT_PIXEL_MODE_GRAY */
229  /* qt_ft_pixel_mode_pal2 :: see @QT_FT_PIXEL_MODE_GRAY2 */
230  /* qt_ft_pixel_mode_pal4 :: see @QT_FT_PIXEL_MODE_GRAY4 */
231  /* */
232 #define qt_ft_pixel_mode_none QT_FT_PIXEL_MODE_NONE
233 #define qt_ft_pixel_mode_mono QT_FT_PIXEL_MODE_MONO
234 #define qt_ft_pixel_mode_grays QT_FT_PIXEL_MODE_GRAY
235 #define qt_ft_pixel_mode_pal2 QT_FT_PIXEL_MODE_GRAY2
236 #define qt_ft_pixel_mode_pal4 QT_FT_PIXEL_MODE_GRAY4
237 
238  /* */
239 
240 #if 0
241 
242  /*************************************************************************/
243  /* */
244  /* <Enum> */
245  /* QT_FT_Palette_Mode */
246  /* */
247  /* <Description> */
248  /* THIS TYPE IS DEPRECATED. DO NOT USE IT! */
249  /* */
250  /* An enumeration type used to describe the format of a bitmap */
251  /* palette, used with qt_ft_pixel_mode_pal4 and qt_ft_pixel_mode_pal8. */
252  /* */
253  /* <Fields> */
254  /* qt_ft_palette_mode_rgb :: The palette is an array of 3-bytes RGB */
255  /* records. */
256  /* */
257  /* qt_ft_palette_mode_rgba :: The palette is an array of 4-bytes RGBA */
258  /* records. */
259  /* */
260  /* <Note> */
261  /* As qt_ft_pixel_mode_pal2, pal4 and pal8 are currently unused by */
262  /* FreeType, these types are not handled by the library itself. */
263  /* */
264  typedef enum QT_FT_Palette_Mode_
265  {
266  qt_ft_palette_mode_rgb = 0,
267  qt_ft_palette_mode_rgba,
268 
269  qt_ft_palettte_mode_max /* do not remove */
270 
271  } QT_FT_Palette_Mode;
272 
273  /* */
274 
275 #endif
276 
277 
278  /*************************************************************************/
279  /* */
280  /* <Struct> */
281  /* QT_FT_Bitmap */
282  /* */
283  /* <Description> */
284  /* A structure used to describe a bitmap or pixmap to the raster. */
285  /* Note that we now manage pixmaps of various depths through the */
286  /* `pixel_mode' field. */
287  /* */
288  /* <Fields> */
289  /* rows :: The number of bitmap rows. */
290  /* */
291  /* width :: The number of pixels in bitmap row. */
292  /* */
293  /* pitch :: The pitch's absolute value is the number of bytes */
294  /* taken by one bitmap row, including padding. */
295  /* However, the pitch is positive when the bitmap has */
296  /* a `down' flow, and negative when it has an `up' */
297  /* flow. In all cases, the pitch is an offset to add */
298  /* to a bitmap pointer in order to go down one row. */
299  /* */
300  /* buffer :: A typeless pointer to the bitmap buffer. This */
301  /* value should be aligned on 32-bit boundaries in */
302  /* most cases. */
303  /* */
304  /* num_grays :: This field is only used with */
305  /* `QT_FT_PIXEL_MODE_GRAY'; it gives the number of gray */
306  /* levels used in the bitmap. */
307  /* */
308  /* pixel_mode :: The pixel mode, i.e., how pixel bits are stored. */
309  /* See @QT_FT_Pixel_Mode for possible values. */
310  /* */
311  /* palette_mode :: This field is only used with paletted pixel modes; */
312  /* it indicates how the palette is stored. */
313  /* */
314  /* palette :: A typeless pointer to the bitmap palette; only */
315  /* used for paletted pixel modes. */
316  /* */
317  /* <Note> */
318  /* For now, the only pixel mode supported by FreeType are mono and */
319  /* grays. However, drivers might be added in the future to support */
320  /* more `colorful' options. */
321  /* */
322  /* When using pixel modes pal2, pal4 and pal8 with a void `palette' */
323  /* field, a gray pixmap with respectively 4, 16, and 256 levels of */
324  /* gray is assumed. This, in order to be compatible with some */
325  /* embedded bitmap formats defined in the TrueType specification. */
326  /* */
327  /* Note that no font was found presenting such embedded bitmaps, so */
328  /* this is currently completely unhandled by the library. */
329  /* */
330  typedef struct QT_FT_Bitmap_
331  {
332  int rows;
333  int width;
334  int pitch;
335  unsigned char* buffer;
336  short num_grays;
337  char pixel_mode;
338  char palette_mode;
339  void* palette;
340 
341  } QT_FT_Bitmap;
342 
343 
344  /*************************************************************************/
345  /* */
346  /* <Section> */
347  /* outline_processing */
348  /* */
349  /*************************************************************************/
350 
351 
352  /*************************************************************************/
353  /* */
354  /* <Struct> */
355  /* QT_FT_Outline */
356  /* */
357  /* <Description> */
358  /* This structure is used to describe an outline to the scan-line */
359  /* converter. */
360  /* */
361  /* <Fields> */
362  /* n_contours :: The number of contours in the outline. */
363  /* */
364  /* n_points :: The number of points in the outline. */
365  /* */
366  /* points :: A pointer to an array of `n_points' QT_FT_Vector */
367  /* elements, giving the outline's point coordinates. */
368  /* */
369  /* tags :: A pointer to an array of `n_points' chars, giving */
370  /* each outline point's type. If bit 0 is unset, the */
371  /* point is `off' the curve, i.e. a Bezier control */
372  /* point, while it is `on' when set. */
373  /* */
374  /* Bit 1 is meaningful for `off' points only. If set, */
375  /* it indicates a third-order Bezier arc control point; */
376  /* and a second-order control point if unset. */
377  /* */
378  /* contours :: An array of `n_contours' shorts, giving the end */
379  /* point of each contour within the outline. For */
380  /* example, the first contour is defined by the points */
381  /* `0' to `contours[0]', the second one is defined by */
382  /* the points `contours[0]+1' to `contours[1]', etc. */
383  /* */
384  /* flags :: A set of bit flags used to characterize the outline */
385  /* and give hints to the scan-converter and hinter on */
386  /* how to convert/grid-fit it. See QT_FT_Outline_Flags. */
387  /* */
388  typedef struct QT_FT_Outline_
389  {
390  int n_contours; /* number of contours in glyph */
391  int n_points; /* number of points in the glyph */
392 
393  QT_FT_Vector* points; /* the outline's points */
394  char* tags; /* the points flags */
395  int* contours; /* the contour end points */
396 
397  int flags; /* outline masks */
398 
399  } QT_FT_Outline;
400 
401 
402  /*************************************************************************/
403  /* */
404  /* <Enum> */
405  /* QT_FT_OUTLINE_FLAGS */
406  /* */
407  /* <Description> */
408  /* A list of bit-field constants use for the flags in an outline's */
409  /* `flags' field. */
410  /* */
411  /* <Values> */
412  /* QT_FT_OUTLINE_NONE :: Value 0 is reserved. */
413  /* */
414  /* QT_FT_OUTLINE_OWNER :: If set, this flag indicates that the */
415  /* outline's field arrays (i.e. */
416  /* `points', `flags' & `contours') are */
417  /* `owned' by the outline object, and */
418  /* should thus be freed when it is */
419  /* destroyed. */
420  /* */
421  /* QT_FT_OUTLINE_EVEN_ODD_FILL :: By default, outlines are filled using */
422  /* the non-zero winding rule. If set to */
423  /* 1, the outline will be filled using */
424  /* the even-odd fill rule (only works */
425  /* with the smooth raster). */
426  /* */
427  /* QT_FT_OUTLINE_REVERSE_FILL :: By default, outside contours of an */
428  /* outline are oriented in clock-wise */
429  /* direction, as defined in the TrueType */
430  /* specification. This flag is set if */
431  /* the outline uses the opposite */
432  /* direction (typically for Type 1 */
433  /* fonts). This flag is ignored by the */
434  /* scan-converter. However, it is very */
435  /* important for the auto-hinter. */
436  /* */
437  /* QT_FT_OUTLINE_IGNORE_DROPOUTS :: By default, the scan converter will */
438  /* try to detect drop-outs in an outline */
439  /* and correct the glyph bitmap to */
440  /* ensure consistent shape continuity. */
441  /* If set, this flag hints the scan-line */
442  /* converter to ignore such cases. */
443  /* */
444  /* QT_FT_OUTLINE_HIGH_PRECISION :: This flag indicates that the */
445  /* scan-line converter should try to */
446  /* convert this outline to bitmaps with */
447  /* the highest possible quality. It is */
448  /* typically set for small character */
449  /* sizes. Note that this is only a */
450  /* hint, that might be completely */
451  /* ignored by a given scan-converter. */
452  /* */
453  /* QT_FT_OUTLINE_SINGLE_PASS :: This flag is set to force a given */
454  /* scan-converter to only use a single */
455  /* pass over the outline to render a */
456  /* bitmap glyph image. Normally, it is */
457  /* set for very large character sizes. */
458  /* It is only a hint, that might be */
459  /* completely ignored by a given */
460  /* scan-converter. */
461  /* */
462 #define QT_FT_OUTLINE_NONE 0x0
463 #define QT_FT_OUTLINE_OWNER 0x1
464 #define QT_FT_OUTLINE_EVEN_ODD_FILL 0x2
465 #define QT_FT_OUTLINE_REVERSE_FILL 0x4
466 #define QT_FT_OUTLINE_IGNORE_DROPOUTS 0x8
467 
468 #define QT_FT_OUTLINE_HIGH_PRECISION 0x100
469 #define QT_FT_OUTLINE_SINGLE_PASS 0x200
470 
471 
472  /*************************************************************************
473  *
474  * @enum:
475  * qt_ft_outline_flags
476  *
477  * @description:
478  * These constants are deprecated. Please use the corresponding
479  * @QT_FT_OUTLINE_FLAGS values.
480  *
481  * @values:
482  * qt_ft_outline_none :: See @QT_FT_OUTLINE_NONE.
483  * qt_ft_outline_owner :: See @QT_FT_OUTLINE_OWNER.
484  * qt_ft_outline_even_odd_fill :: See @QT_FT_OUTLINE_EVEN_ODD_FILL.
485  * qt_ft_outline_reverse_fill :: See @QT_FT_OUTLINE_REVERSE_FILL.
486  * qt_ft_outline_ignore_dropouts :: See @QT_FT_OUTLINE_IGNORE_DROPOUTS.
487  * qt_ft_outline_high_precision :: See @QT_FT_OUTLINE_HIGH_PRECISION.
488  * qt_ft_outline_single_pass :: See @QT_FT_OUTLINE_SINGLE_PASS.
489  */
490 #define qt_ft_outline_none QT_FT_OUTLINE_NONE
491 #define qt_ft_outline_owner QT_FT_OUTLINE_OWNER
492 #define qt_ft_outline_even_odd_fill QT_FT_OUTLINE_EVEN_ODD_FILL
493 #define qt_ft_outline_reverse_fill QT_FT_OUTLINE_REVERSE_FILL
494 #define qt_ft_outline_ignore_dropouts QT_FT_OUTLINE_IGNORE_DROPOUTS
495 #define qt_ft_outline_high_precision QT_FT_OUTLINE_HIGH_PRECISION
496 #define qt_ft_outline_single_pass QT_FT_OUTLINE_SINGLE_PASS
497 
498  /* */
499 
500 #define QT_FT_CURVE_TAG( flag ) ( flag & 3 )
501 
502 #define QT_FT_CURVE_TAG_ON 1
503 #define QT_FT_CURVE_TAG_CONIC 0
504 #define QT_FT_CURVE_TAG_CUBIC 2
505 
506 #define QT_FT_CURVE_TAG_TOUCH_X 8 /* reserved for the TrueType hinter */
507 #define QT_FT_CURVE_TAG_TOUCH_Y 16 /* reserved for the TrueType hinter */
508 
509 #define QT_FT_CURVE_TAG_TOUCH_BOTH ( QT_FT_CURVE_TAG_TOUCH_X | \
510  QT_FT_CURVE_TAG_TOUCH_Y )
511 
512 #define QT_FT_Curve_Tag_On QT_FT_CURVE_TAG_ON
513 #define QT_FT_Curve_Tag_Conic QT_FT_CURVE_TAG_CONIC
514 #define QT_FT_Curve_Tag_Cubic QT_FT_CURVE_TAG_CUBIC
515 #define QT_FT_Curve_Tag_Touch_X QT_FT_CURVE_TAG_TOUCH_X
516 #define QT_FT_Curve_Tag_Touch_Y QT_FT_CURVE_TAG_TOUCH_Y
517 
518  /*************************************************************************/
519  /* */
520  /* <FuncType> */
521  /* QT_FT_Outline_MoveToFunc */
522  /* */
523  /* <Description> */
524  /* A function pointer type used to describe the signature of a `move */
525  /* to' function during outline walking/decomposition. */
526  /* */
527  /* A `move to' is emitted to start a new contour in an outline. */
528  /* */
529  /* <Input> */
530  /* to :: A pointer to the target point of the `move to'. */
531  /* */
532  /* user :: A typeless pointer which is passed from the caller of the */
533  /* decomposition function. */
534  /* */
535  /* <Return> */
536  /* Error code. 0 means success. */
537  /* */
538  typedef int
539  (*QT_FT_Outline_MoveToFunc)( QT_FT_Vector* to,
540  void* user );
541 
542 #define QT_FT_Outline_MoveTo_Func QT_FT_Outline_MoveToFunc
543 
544  /*************************************************************************/
545  /* */
546  /* <FuncType> */
547  /* QT_FT_Outline_LineToFunc */
548  /* */
549  /* <Description> */
550  /* A function pointer type used to describe the signature of a `line */
551  /* to' function during outline walking/decomposition. */
552  /* */
553  /* A `line to' is emitted to indicate a segment in the outline. */
554  /* */
555  /* <Input> */
556  /* to :: A pointer to the target point of the `line to'. */
557  /* */
558  /* user :: A typeless pointer which is passed from the caller of the */
559  /* decomposition function. */
560  /* */
561  /* <Return> */
562  /* Error code. 0 means success. */
563  /* */
564  typedef int
565  (*QT_FT_Outline_LineToFunc)( QT_FT_Vector* to,
566  void* user );
567 
568 #define QT_FT_Outline_LineTo_Func QT_FT_Outline_LineToFunc
569 
570  /*************************************************************************/
571  /* */
572  /* <FuncType> */
573  /* QT_FT_Outline_ConicToFunc */
574  /* */
575  /* <Description> */
576  /* A function pointer type use to describe the signature of a `conic */
577  /* to' function during outline walking/decomposition. */
578  /* */
579  /* A `conic to' is emitted to indicate a second-order Bezier arc in */
580  /* the outline. */
581  /* */
582  /* <Input> */
583  /* control :: An intermediate control point between the last position */
584  /* and the new target in `to'. */
585  /* */
586  /* to :: A pointer to the target end point of the conic arc. */
587  /* */
588  /* user :: A typeless pointer which is passed from the caller of */
589  /* the decomposition function. */
590  /* */
591  /* <Return> */
592  /* Error code. 0 means success. */
593  /* */
594  typedef int
595  (*QT_FT_Outline_ConicToFunc)( QT_FT_Vector* control,
596  QT_FT_Vector* to,
597  void* user );
598 
599 #define QT_FT_Outline_ConicTo_Func QT_FT_Outline_ConicToFunc
600 
601  /*************************************************************************/
602  /* */
603  /* <FuncType> */
604  /* QT_FT_Outline_CubicToFunc */
605  /* */
606  /* <Description> */
607  /* A function pointer type used to describe the signature of a `cubic */
608  /* to' function during outline walking/decomposition. */
609  /* */
610  /* A `cubic to' is emitted to indicate a third-order Bezier arc. */
611  /* */
612  /* <Input> */
613  /* control1 :: A pointer to the first Bezier control point. */
614  /* */
615  /* control2 :: A pointer to the second Bezier control point. */
616  /* */
617  /* to :: A pointer to the target end point. */
618  /* */
619  /* user :: A typeless pointer which is passed from the caller of */
620  /* the decomposition function. */
621  /* */
622  /* <Return> */
623  /* Error code. 0 means success. */
624  /* */
625  typedef int
626  (*QT_FT_Outline_CubicToFunc)( QT_FT_Vector* control1,
627  QT_FT_Vector* control2,
628  QT_FT_Vector* to,
629  void* user );
630 
631 #define QT_FT_Outline_CubicTo_Func QT_FT_Outline_CubicToFunc
632 
633 
634  /*************************************************************************/
635  /* */
636  /* <Struct> */
637  /* QT_FT_Outline_Funcs */
638  /* */
639  /* <Description> */
640  /* A structure to hold various function pointers used during outline */
641  /* decomposition in order to emit segments, conic, and cubic Beziers, */
642  /* as well as `move to' and `close to' operations. */
643  /* */
644  /* <Fields> */
645  /* move_to :: The `move to' emitter. */
646  /* */
647  /* line_to :: The segment emitter. */
648  /* */
649  /* conic_to :: The second-order Bezier arc emitter. */
650  /* */
651  /* cubic_to :: The third-order Bezier arc emitter. */
652  /* */
653  /* shift :: The shift that is applied to coordinates before they */
654  /* are sent to the emitter. */
655  /* */
656  /* delta :: The delta that is applied to coordinates before they */
657  /* are sent to the emitter, but after the shift. */
658  /* */
659  /* <Note> */
660  /* The point coordinates sent to the emitters are the transformed */
661  /* version of the original coordinates (this is important for high */
662  /* accuracy during scan-conversion). The transformation is simple: */
663  /* */
664  /* x' = (x << shift) - delta */
665  /* y' = (x << shift) - delta */
666  /* */
667  /* Set the value of `shift' and `delta' to 0 to get the original */
668  /* point coordinates. */
669  /* */
670  typedef struct QT_FT_Outline_Funcs_
671  {
672  QT_FT_Outline_MoveToFunc move_to;
673  QT_FT_Outline_LineToFunc line_to;
674  QT_FT_Outline_ConicToFunc conic_to;
675  QT_FT_Outline_CubicToFunc cubic_to;
676 
677  int shift;
678  QT_FT_Pos delta;
679 
680  } QT_FT_Outline_Funcs;
681 
682 
683  /*************************************************************************/
684  /* */
685  /* <Section> */
686  /* basic_types */
687  /* */
688  /*************************************************************************/
689 
690 
691  /*************************************************************************/
692  /* */
693  /* <Macro> */
694  /* QT_FT_IMAGE_TAG */
695  /* */
696  /* <Description> */
697  /* This macro converts four letter tags into an unsigned long. */
698  /* */
699  /* <Note> */
700  /* Since many 16bit compilers don't like 32bit enumerations, you */
701  /* should redefine this macro in case of problems to something like */
702  /* this: */
703  /* */
704  /* #define QT_FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 ) value */
705  /* */
706  /* to get a simple enumeration without assigning special numbers. */
707  /* */
708 #ifndef QT_FT_IMAGE_TAG
709 #define QT_FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 ) \
710  value = ( ( (unsigned long)_x1 << 24 ) | \
711  ( (unsigned long)_x2 << 16 ) | \
712  ( (unsigned long)_x3 << 8 ) | \
713  (unsigned long)_x4 )
714 #endif /* QT_FT_IMAGE_TAG */
715 
716 
717  /*************************************************************************/
718  /* */
719  /* <Enum> */
720  /* QT_FT_Glyph_Format */
721  /* */
722  /* <Description> */
723  /* An enumeration type used to describe the format of a given glyph */
724  /* image. Note that this version of FreeType only supports two image */
725  /* formats, even though future font drivers will be able to register */
726  /* their own format. */
727  /* */
728  /* <Values> */
729  /* QT_FT_GLYPH_FORMAT_NONE :: */
730  /* The value 0 is reserved and does describe a glyph format. */
731  /* */
732  /* QT_FT_GLYPH_FORMAT_COMPOSITE :: */
733  /* The glyph image is a composite of several other images. This */
734  /* format is _only_ used with @QT_FT_LOAD_NO_RECURSE, and is used to */
735  /* report compound glyphs (like accented characters). */
736  /* */
737  /* QT_FT_GLYPH_FORMAT_BITMAP :: */
738  /* The glyph image is a bitmap, and can be described as an */
739  /* @QT_FT_Bitmap. You generally need to access the `bitmap' field of */
740  /* the @QT_FT_GlyphSlotRec structure to read it. */
741  /* */
742  /* QT_FT_GLYPH_FORMAT_OUTLINE :: */
743  /* The glyph image is a vertorial outline made of line segments */
744  /* and Bezier arcs; it can be described as an @QT_FT_Outline; you */
745  /* generally want to access the `outline' field of the */
746  /* @QT_FT_GlyphSlotRec structure to read it. */
747  /* */
748  /* QT_FT_GLYPH_FORMAT_PLOTTER :: */
749  /* The glyph image is a vectorial path with no inside/outside */
750  /* contours. Some Type 1 fonts, like those in the Hershey family, */
751  /* contain glyphs in this format. These are described as */
752  /* @QT_FT_Outline, but FreeType isn't currently capable of rendering */
753  /* them correctly. */
754  /* */
755  typedef enum QT_FT_Glyph_Format_
756  {
757  QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_NONE, 0, 0, 0, 0 ),
758 
759  QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_COMPOSITE, 'c', 'o', 'm', 'p' ),
760  QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_BITMAP, 'b', 'i', 't', 's' ),
761  QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_OUTLINE, 'o', 'u', 't', 'l' ),
762  QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_PLOTTER, 'p', 'l', 'o', 't' )
763 
764  } QT_FT_Glyph_Format;
765 
766 
767  /*************************************************************************/
768  /* */
769  /* <Enum> */
770  /* qt_ft_glyph_format_xxx */
771  /* */
772  /* <Description> */
773  /* A list of decprecated constants. Use the corresponding */
774  /* @QT_FT_Glyph_Format values instead. */
775  /* */
776  /* <Values> */
777  /* qt_ft_glyph_format_none :: see @QT_FT_GLYPH_FORMAT_NONE */
778  /* qt_ft_glyph_format_composite :: see @QT_FT_GLYPH_FORMAT_COMPOSITE */
779  /* qt_ft_glyph_format_bitmap :: see @QT_FT_GLYPH_FORMAT_BITMAP */
780  /* qt_ft_glyph_format_outline :: see @QT_FT_GLYPH_FORMAT_OUTLINE */
781  /* qt_ft_glyph_format_plotter :: see @QT_FT_GLYPH_FORMAT_PLOTTER */
782  /* */
783 #define qt_ft_glyph_format_none QT_FT_GLYPH_FORMAT_NONE
784 #define qt_ft_glyph_format_composite QT_FT_GLYPH_FORMAT_COMPOSITE
785 #define qt_ft_glyph_format_bitmap QT_FT_GLYPH_FORMAT_BITMAP
786 #define qt_ft_glyph_format_outline QT_FT_GLYPH_FORMAT_OUTLINE
787 #define qt_ft_glyph_format_plotter QT_FT_GLYPH_FORMAT_PLOTTER
788 
789 
790  /*************************************************************************/
791  /*************************************************************************/
792  /*************************************************************************/
793  /***** *****/
794  /***** R A S T E R D E F I N I T I O N S *****/
795  /***** *****/
796  /*************************************************************************/
797  /*************************************************************************/
798  /*************************************************************************/
799 
800 
801  /*************************************************************************/
802  /* */
803  /* A raster is a scan converter, in charge of rendering an outline into */
804  /* a a bitmap. This section contains the public API for rasters. */
805  /* */
806  /* Note that in FreeType 2, all rasters are now encapsulated within */
807  /* specific modules called `renderers'. See `freetype/ftrender.h' for */
808  /* more details on renderers. */
809  /* */
810  /*************************************************************************/
811 
812 
813  /*************************************************************************/
814  /* */
815  /* <Section> */
816  /* raster */
817  /* */
818  /* <Title> */
819  /* Scanline converter */
820  /* */
821  /* <Abstract> */
822  /* How vectorial outlines are converted into bitmaps and pixmaps. */
823  /* */
824  /* <Description> */
825  /* This section contains technical definitions. */
826  /* */
827  /*************************************************************************/
828 
829 
830  /*************************************************************************/
831  /* */
832  /* <Type> */
833  /* QT_FT_Raster */
834  /* */
835  /* <Description> */
836  /* A handle (pointer) to a raster object. Each object can be used */
837  /* independently to convert an outline into a bitmap or pixmap. */
838  /* */
839  typedef struct TRaster_ *QT_FT_Raster;
840 
841 
842  /*************************************************************************/
843  /* */
844  /* <Struct> */
845  /* QT_FT_Span */
846  /* */
847  /* <Description> */
848  /* A structure used to model a single span of gray (or black) pixels */
849  /* when rendering a monochrome or anti-aliased bitmap. */
850  /* */
851  /* <Fields> */
852  /* x :: The span's horizontal start position. */
853  /* */
854  /* len :: The span's length in pixels. */
855  /* */
856  /* coverage :: The span color/coverage, ranging from 0 (background) */
857  /* to 255 (foreground). Only used for anti-aliased */
858  /* rendering. */
859  /* */
860  /* <Note> */
861  /* This structure is used by the span drawing callback type named */
862  /* QT_FT_SpanFunc which takes the y-coordinate of the span as a */
863  /* a parameter. */
864  /* */
865  /* The coverage value is always between 0 and 255, even if the number */
866  /* of gray levels have been set through QT_FT_Set_Gray_Levels(). */
867  /* */
868  typedef struct QT_FT_Span_
869  {
870  short x;
871  unsigned short len;
872  short y;
873  unsigned char coverage;
874  } QT_FT_Span;
875 
876 
877  /*************************************************************************/
878  /* */
879  /* <FuncType> */
880  /* QT_FT_SpanFunc */
881  /* */
882  /* <Description> */
883  /* A function used as a call-back by the anti-aliased renderer in */
884  /* order to let client applications draw themselves the gray pixel */
885  /* spans on each scan line. */
886  /* */
887  /* <Input> */
888  /* y :: The scanline's y-coordinate. */
889  /* */
890  /* count :: The number of spans to draw on this scanline. */
891  /* */
892  /* spans :: A table of `count' spans to draw on the scanline. */
893  /* */
894  /* user :: User-supplied data that is passed to the callback. */
895  /* */
896  /* <Note> */
897  /* This callback allows client applications to directly render the */
898  /* gray spans of the anti-aliased bitmap to any kind of surfaces. */
899  /* */
900  /* This can be used to write anti-aliased outlines directly to a */
901  /* given background bitmap, and even perform translucency. */
902  /* */
903  /* Note that the `count' field cannot be greater than a fixed value */
904  /* defined by the QT_FT_MAX_GRAY_SPANS configuration macro in */
905  /* ftoption.h. By default, this value is set to 32, which means that */
906  /* if there are more than 32 spans on a given scanline, the callback */
907  /* will be called several times with the same `y' parameter in order */
908  /* to draw all callbacks. */
909  /* */
910  /* Otherwise, the callback is only called once per scan-line, and */
911  /* only for those scanlines that do have `gray' pixels on them. */
912  /* */
913  typedef void
914  (*QT_FT_SpanFunc)(int count,
915  const QT_FT_Span* spans,
916  void* worker);
917 
918 #define QT_FT_Raster_Span_Func QT_FT_SpanFunc
919 
920 
921  /*************************************************************************/
922  /* */
923  /* <FuncType> */
924  /* QT_FT_Raster_BitTest_Func */
925  /* */
926  /* <Description> */
927  /* THIS TYPE IS DEPRECATED. DO NOT USE IT. */
928  /* */
929  /* A function used as a call-back by the monochrome scan-converter */
930  /* to test whether a given target pixel is already set to the drawing */
931  /* `color'. These tests are crucial to implement drop-out control */
932  /* per-se the TrueType spec. */
933  /* */
934  /* <Input> */
935  /* y :: The pixel's y-coordinate. */
936  /* */
937  /* x :: The pixel's x-coordinate. */
938  /* */
939  /* user :: User-supplied data that is passed to the callback. */
940  /* */
941  /* <Return> */
942  /* 1 if the pixel is `set', 0 otherwise. */
943  /* */
944  typedef int
945  (*QT_FT_Raster_BitTest_Func)( int y,
946  int x,
947  void* user );
948 
949 
950  /*************************************************************************/
951  /* */
952  /* <FuncType> */
953  /* QT_FT_Raster_BitSet_Func */
954  /* */
955  /* <Description> */
956  /* THIS TYPE IS DEPRECATED. DO NOT USE IT. */
957  /* */
958  /* A function used as a call-back by the monochrome scan-converter */
959  /* to set an individual target pixel. This is crucial to implement */
960  /* drop-out control according to the TrueType specification. */
961  /* */
962  /* <Input> */
963  /* y :: The pixel's y-coordinate. */
964  /* */
965  /* x :: The pixel's x-coordinate. */
966  /* */
967  /* user :: User-supplied data that is passed to the callback. */
968  /* */
969  /* <Return> */
970  /* 1 if the pixel is `set', 0 otherwise. */
971  /* */
972  typedef void
973  (*QT_FT_Raster_BitSet_Func)( int y,
974  int x,
975  void* user );
976 
977 
978  /*************************************************************************/
979  /* */
980  /* <Enum> */
981  /* QT_FT_RASTER_FLAG_XXX */
982  /* */
983  /* <Description> */
984  /* A list of bit flag constants as used in the `flags' field of a */
985  /* @QT_FT_Raster_Params structure. */
986  /* */
987  /* <Values> */
988  /* QT_FT_RASTER_FLAG_DEFAULT :: This value is 0. */
989  /* */
990  /* QT_FT_RASTER_FLAG_AA :: This flag is set to indicate that an */
991  /* anti-aliased glyph image should be */
992  /* generated. Otherwise, it will be */
993  /* monochrome (1-bit). */
994  /* */
995  /* QT_FT_RASTER_FLAG_DIRECT :: This flag is set to indicate direct */
996  /* rendering. In this mode, client */
997  /* applications must provide their own span */
998  /* callback. This lets them directly */
999  /* draw or compose over an existing bitmap. */
1000  /* If this bit is not set, the target */
1001  /* pixmap's buffer _must_ be zeroed before */
1002  /* rendering. */
1003  /* */
1004  /* Note that for now, direct rendering is */
1005  /* only possible with anti-aliased glyphs. */
1006  /* */
1007  /* QT_FT_RASTER_FLAG_CLIP :: This flag is only used in direct */
1008  /* rendering mode. If set, the output will */
1009  /* be clipped to a box specified in the */
1010  /* "clip_box" field of the QT_FT_Raster_Params */
1011  /* structure. */
1012  /* */
1013  /* Note that by default, the glyph bitmap */
1014  /* is clipped to the target pixmap, except */
1015  /* in direct rendering mode where all spans */
1016  /* are generated if no clipping box is set. */
1017  /* */
1018 #define QT_FT_RASTER_FLAG_DEFAULT 0x0
1019 #define QT_FT_RASTER_FLAG_AA 0x1
1020 #define QT_FT_RASTER_FLAG_DIRECT 0x2
1021 #define QT_FT_RASTER_FLAG_CLIP 0x4
1022 
1023  /* deprecated */
1024 #define qt_ft_raster_flag_default QT_FT_RASTER_FLAG_DEFAULT
1025 #define qt_ft_raster_flag_aa QT_FT_RASTER_FLAG_AA
1026 #define qt_ft_raster_flag_direct QT_FT_RASTER_FLAG_DIRECT
1027 #define qt_ft_raster_flag_clip QT_FT_RASTER_FLAG_CLIP
1028 
1029 
1030  /*************************************************************************/
1031  /* */
1032  /* <Struct> */
1033  /* QT_FT_Raster_Params */
1034  /* */
1035  /* <Description> */
1036  /* A structure to hold the arguments used by a raster's render */
1037  /* function. */
1038  /* */
1039  /* <Fields> */
1040  /* target :: The target bitmap. */
1041  /* */
1042  /* source :: A pointer to the source glyph image (e.g. an */
1043  /* QT_FT_Outline). */
1044  /* */
1045  /* flags :: The rendering flags. */
1046  /* */
1047  /* gray_spans :: The gray span drawing callback. */
1048  /* */
1049  /* black_spans :: The black span drawing callback. */
1050  /* */
1051  /* bit_test :: The bit test callback. UNIMPLEMENTED! */
1052  /* */
1053  /* bit_set :: The bit set callback. UNIMPLEMENTED! */
1054  /* */
1055  /* user :: User-supplied data that is passed to each drawing */
1056  /* callback. */
1057  /* */
1058  /* clip_box :: An optional clipping box. It is only used in */
1059  /* direct rendering mode. Note that coordinates here */
1060  /* should be expressed in _integer_ pixels (and not in */
1061  /* 26.6 fixed-point units). */
1062  /* */
1063  /* <Note> */
1064  /* An anti-aliased glyph bitmap is drawn if the QT_FT_RASTER_FLAG_AA bit */
1065  /* flag is set in the `flags' field, otherwise a monochrome bitmap */
1066  /* will be generated. */
1067  /* */
1068  /* If the QT_FT_RASTER_FLAG_DIRECT bit flag is set in `flags', the */
1069  /* raster will call the `gray_spans' callback to draw gray pixel */
1070  /* spans, in the case of an aa glyph bitmap, it will call */
1071  /* `black_spans', and `bit_test' and `bit_set' in the case of a */
1072  /* monochrome bitmap. This allows direct composition over a */
1073  /* pre-existing bitmap through user-provided callbacks to perform the */
1074  /* span drawing/composition. */
1075  /* */
1076  /* Note that the `bit_test' and `bit_set' callbacks are required when */
1077  /* rendering a monochrome bitmap, as they are crucial to implement */
1078  /* correct drop-out control as defined in the TrueType specification. */
1079  /* */
1080  typedef struct QT_FT_Raster_Params_
1081  {
1082  QT_FT_Bitmap* target;
1083  void* source;
1084  int flags;
1085  QT_FT_SpanFunc gray_spans;
1086  QT_FT_SpanFunc black_spans;
1087  QT_FT_Raster_BitTest_Func bit_test; /* doesn't work! */
1088  QT_FT_Raster_BitSet_Func bit_set; /* doesn't work! */
1089  void* user;
1090  QT_FT_BBox clip_box;
1091  int skip_spans;
1092 
1093  } QT_FT_Raster_Params;
1094 
1095 
1096  /*************************************************************************/
1097  /* */
1098  /* <FuncType> */
1099  /* QT_FT_Raster_NewFunc */
1100  /* */
1101  /* <Description> */
1102  /* A function used to create a new raster object. */
1103  /* */
1104  /* <Input> */
1105  /* memory :: A handle to the memory allocator. */
1106  /* */
1107  /* <Output> */
1108  /* raster :: A handle to the new raster object. */
1109  /* */
1110  /* <Return> */
1111  /* Error code. 0 means success. */
1112  /* */
1113  /* <Note> */
1114  /* The `memory' parameter is a typeless pointer in order to avoid */
1115  /* un-wanted dependencies on the rest of the FreeType code. In */
1116  /* practice, it is a QT_FT_Memory, i.e., a handle to the standard */
1117  /* FreeType memory allocator. However, this field can be completely */
1118  /* ignored by a given raster implementation. */
1119  /* */
1120  typedef int
1121  (*QT_FT_Raster_NewFunc)( QT_FT_Raster* raster );
1122 
1123 #define QT_FT_Raster_New_Func QT_FT_Raster_NewFunc
1124 
1125  /*************************************************************************/
1126  /* */
1127  /* <FuncType> */
1128  /* QT_FT_Raster_DoneFunc */
1129  /* */
1130  /* <Description> */
1131  /* A function used to destroy a given raster object. */
1132  /* */
1133  /* <Input> */
1134  /* raster :: A handle to the raster object. */
1135  /* */
1136  typedef void
1137  (*QT_FT_Raster_DoneFunc)( QT_FT_Raster raster );
1138 
1139 #define QT_FT_Raster_Done_Func QT_FT_Raster_DoneFunc
1140 
1141  /*************************************************************************/
1142  /* */
1143  /* <FuncType> */
1144  /* QT_FT_Raster_ResetFunc */
1145  /* */
1146  /* <Description> */
1147  /* FreeType provides an area of memory called the `render pool', */
1148  /* available to all registered rasters. This pool can be freely used */
1149  /* during a given scan-conversion but is shared by all rasters. Its */
1150  /* content is thus transient. */
1151  /* */
1152  /* This function is called each time the render pool changes, or just */
1153  /* after a new raster object is created. */
1154  /* */
1155  /* <Input> */
1156  /* raster :: A handle to the new raster object. */
1157  /* */
1158  /* pool_base :: The address in memory of the render pool. */
1159  /* */
1160  /* pool_size :: The size in bytes of the render pool. */
1161  /* */
1162  /* <Note> */
1163  /* Rasters can ignore the render pool and rely on dynamic memory */
1164  /* allocation if they want to (a handle to the memory allocator is */
1165  /* passed to the raster constructor). However, this is not */
1166  /* recommended for efficiency purposes. */
1167  /* */
1168  typedef void
1169  (*QT_FT_Raster_ResetFunc)( QT_FT_Raster raster,
1170  unsigned char* pool_base,
1171  unsigned long pool_size );
1172 
1173 #define QT_FT_Raster_Reset_Func QT_FT_Raster_ResetFunc
1174 
1175  /*************************************************************************/
1176  /* */
1177  /* <FuncType> */
1178  /* QT_FT_Raster_SetModeFunc */
1179  /* */
1180  /* <Description> */
1181  /* This function is a generic facility to change modes or attributes */
1182  /* in a given raster. This can be used for debugging purposes, or */
1183  /* simply to allow implementation-specific `features' in a given */
1184  /* raster module. */
1185  /* */
1186  /* <Input> */
1187  /* raster :: A handle to the new raster object. */
1188  /* */
1189  /* mode :: A 4-byte tag used to name the mode or property. */
1190  /* */
1191  /* args :: A pointer to the new mode/property to use. */
1192  /* */
1193  typedef int
1194  (*QT_FT_Raster_SetModeFunc)( QT_FT_Raster raster,
1195  unsigned long mode,
1196  void* args );
1197 
1198 #define QT_FT_Raster_Set_Mode_Func QT_FT_Raster_SetModeFunc
1199 
1200  /*************************************************************************/
1201  /* */
1202  /* <FuncType> */
1203  /* QT_FT_Raster_RenderFunc */
1204  /* */
1205  /* <Description> */
1206  /* Invokes a given raster to scan-convert a given glyph image into a */
1207  /* target bitmap. */
1208  /* */
1209  /* <Input> */
1210  /* raster :: A handle to the raster object. */
1211  /* */
1212  /* params :: A pointer to a QT_FT_Raster_Params structure used to store */
1213  /* the rendering parameters. */
1214  /* */
1215  /* <Return> */
1216  /* Error code. 0 means success. */
1217  /* */
1218  /* <Note> */
1219  /* The exact format of the source image depends on the raster's glyph */
1220  /* format defined in its QT_FT_Raster_Funcs structure. It can be an */
1221  /* QT_FT_Outline or anything else in order to support a large array of */
1222  /* glyph formats. */
1223  /* */
1224  /* Note also that the render function can fail and return a */
1225  /* QT_FT_Err_Unimplemented_Feature error code if the raster used does */
1226  /* not support direct composition. */
1227  /* */
1228  /* XXX: For now, the standard raster doesn't support direct */
1229  /* composition but this should change for the final release (see */
1230  /* the files demos/src/ftgrays.c and demos/src/ftgrays2.c for */
1231  /* examples of distinct implementations which support direct */
1232  /* composition). */
1233  /* */
1234  typedef int
1235  (*QT_FT_Raster_RenderFunc)( QT_FT_Raster raster,
1236  QT_FT_Raster_Params* params );
1237 
1238 #define QT_FT_Raster_Render_Func QT_FT_Raster_RenderFunc
1239 
1240  /*************************************************************************/
1241  /* */
1242  /* <Struct> */
1243  /* QT_FT_Raster_Funcs */
1244  /* */
1245  /* <Description> */
1246  /* A structure used to describe a given raster class to the library. */
1247  /* */
1248  /* <Fields> */
1249  /* glyph_format :: The supported glyph format for this raster. */
1250  /* */
1251  /* raster_new :: The raster constructor. */
1252  /* */
1253  /* raster_reset :: Used to reset the render pool within the raster. */
1254  /* */
1255  /* raster_render :: A function to render a glyph into a given bitmap. */
1256  /* */
1257  /* raster_done :: The raster destructor. */
1258  /* */
1259  typedef struct QT_FT_Raster_Funcs_
1260  {
1261  QT_FT_Glyph_Format glyph_format;
1262  QT_FT_Raster_NewFunc raster_new;
1263  QT_FT_Raster_ResetFunc raster_reset;
1264  QT_FT_Raster_SetModeFunc raster_set_mode;
1265  QT_FT_Raster_RenderFunc raster_render;
1266  QT_FT_Raster_DoneFunc raster_done;
1267 
1268  } QT_FT_Raster_Funcs;
1269 
1270 
1271  /* */
1272 
1273 
1274 QT_FT_END_HEADER
1275 
1276 #endif /* __FTIMAGE_H__ */
1277 
1278 
1279 /* END */
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