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ftimage.h
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1 /***************************************************************************/
2 /* */
3 /* ftimage.h */
4 /* */
5 /* FreeType glyph image formats and default raster interface */
6 /* (specification). */
7 /* */
8 /* Copyright 1996-2018 by */
9 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
10 /* */
11 /* This file is part of the FreeType project, and may only be used, */
12 /* modified, and distributed under the terms of the FreeType project */
13 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
14 /* this file you indicate that you have read the license and */
15 /* understand and accept it fully. */
16 /* */
17 /***************************************************************************/
18 
19  /*************************************************************************/
20  /* */
21  /* Note: A `raster' is simply a scan-line converter, used to render */
22  /* FT_Outlines into FT_Bitmaps. */
23  /* */
24  /*************************************************************************/
25 
26 
27 #ifndef FTIMAGE_H_
28 #define FTIMAGE_H_
29 
30 
31  /* STANDALONE_ is from ftgrays.c */
32 #ifndef STANDALONE_
33 #include <ft2build.h>
34 #endif
35 
36 
37 FT_BEGIN_HEADER
38 
39 
40  /*************************************************************************/
41  /* */
42  /* <Section> */
43  /* basic_types */
44  /* */
45  /*************************************************************************/
46 
47 
48  /*************************************************************************/
49  /* */
50  /* <Type> */
51  /* FT_Pos */
52  /* */
53  /* <Description> */
54  /* The type FT_Pos is used to store vectorial coordinates. Depending */
55  /* on the context, these can represent distances in integer font */
56  /* units, or 16.16, or 26.6 fixed-point pixel coordinates. */
57  /* */
58  typedef signed long FT_Pos;
59 
60 
61  /*************************************************************************/
62  /* */
63  /* <Struct> */
64  /* FT_Vector */
65  /* */
66  /* <Description> */
67  /* A simple structure used to store a 2D vector; coordinates are of */
68  /* the FT_Pos type. */
69  /* */
70  /* <Fields> */
71  /* x :: The horizontal coordinate. */
72  /* y :: The vertical coordinate. */
73  /* */
74  typedef struct FT_Vector_
75  {
76  FT_Pos x;
77  FT_Pos y;
78 
79  } FT_Vector;
80 
81 
82  /*************************************************************************/
83  /* */
84  /* <Struct> */
85  /* FT_BBox */
86  /* */
87  /* <Description> */
88  /* A structure used to hold an outline's bounding box, i.e., the */
89  /* coordinates of its extrema in the horizontal and vertical */
90  /* directions. */
91  /* */
92  /* <Fields> */
93  /* xMin :: The horizontal minimum (left-most). */
94  /* */
95  /* yMin :: The vertical minimum (bottom-most). */
96  /* */
97  /* xMax :: The horizontal maximum (right-most). */
98  /* */
99  /* yMax :: The vertical maximum (top-most). */
100  /* */
101  /* <Note> */
102  /* The bounding box is specified with the coordinates of the lower */
103  /* left and the upper right corner. In PostScript, those values are */
104  /* often called (llx,lly) and (urx,ury), respectively. */
105  /* */
106  /* If `yMin' is negative, this value gives the glyph's descender. */
107  /* Otherwise, the glyph doesn't descend below the baseline. */
108  /* Similarly, if `ymax' is positive, this value gives the glyph's */
109  /* ascender. */
110  /* */
111  /* `xMin' gives the horizontal distance from the glyph's origin to */
112  /* the left edge of the glyph's bounding box. If `xMin' is negative, */
113  /* the glyph extends to the left of the origin. */
114  /* */
115  typedef struct FT_BBox_
116  {
117  FT_Pos xMin, yMin;
118  FT_Pos xMax, yMax;
119 
120  } FT_BBox;
121 
122 
123  /*************************************************************************/
124  /* */
125  /* <Enum> */
126  /* FT_Pixel_Mode */
127  /* */
128  /* <Description> */
129  /* An enumeration type used to describe the format of pixels in a */
130  /* given bitmap. Note that additional formats may be added in the */
131  /* future. */
132  /* */
133  /* <Values> */
134  /* FT_PIXEL_MODE_NONE :: */
135  /* Value~0 is reserved. */
136  /* */
137  /* FT_PIXEL_MODE_MONO :: */
138  /* A monochrome bitmap, using 1~bit per pixel. Note that pixels */
139  /* are stored in most-significant order (MSB), which means that */
140  /* the left-most pixel in a byte has value 128. */
141  /* */
142  /* FT_PIXEL_MODE_GRAY :: */
143  /* An 8-bit bitmap, generally used to represent anti-aliased glyph */
144  /* images. Each pixel is stored in one byte. Note that the number */
145  /* of `gray' levels is stored in the `num_grays' field of the */
146  /* @FT_Bitmap structure (it generally is 256). */
147  /* */
148  /* FT_PIXEL_MODE_GRAY2 :: */
149  /* A 2-bit per pixel bitmap, used to represent embedded */
150  /* anti-aliased bitmaps in font files according to the OpenType */
151  /* specification. We haven't found a single font using this */
152  /* format, however. */
153  /* */
154  /* FT_PIXEL_MODE_GRAY4 :: */
155  /* A 4-bit per pixel bitmap, representing embedded anti-aliased */
156  /* bitmaps in font files according to the OpenType specification. */
157  /* We haven't found a single font using this format, however. */
158  /* */
159  /* FT_PIXEL_MODE_LCD :: */
160  /* An 8-bit bitmap, representing RGB or BGR decimated glyph images */
161  /* used for display on LCD displays; the bitmap is three times */
162  /* wider than the original glyph image. See also */
163  /* @FT_RENDER_MODE_LCD. */
164  /* */
165  /* FT_PIXEL_MODE_LCD_V :: */
166  /* An 8-bit bitmap, representing RGB or BGR decimated glyph images */
167  /* used for display on rotated LCD displays; the bitmap is three */
168  /* times taller than the original glyph image. See also */
169  /* @FT_RENDER_MODE_LCD_V. */
170  /* */
171  /* FT_PIXEL_MODE_BGRA :: */
172  /* [Since 2.5] An image with four 8-bit channels per pixel, */
173  /* representing a color image (such as emoticons) with alpha */
174  /* channel. For each pixel, the format is BGRA, which means, the */
175  /* blue channel comes first in memory. The color channels are */
176  /* pre-multiplied and in the sRGB colorspace. For example, full */
177  /* red at half-translucent opacity will be represented as */
178  /* `00,00,80,80', not `00,00,FF,80'. See also @FT_LOAD_COLOR. */
179  /* */
180  typedef enum FT_Pixel_Mode_
181  {
182  FT_PIXEL_MODE_NONE = 0,
183  FT_PIXEL_MODE_MONO,
184  FT_PIXEL_MODE_GRAY,
185  FT_PIXEL_MODE_GRAY2,
186  FT_PIXEL_MODE_GRAY4,
187  FT_PIXEL_MODE_LCD,
188  FT_PIXEL_MODE_LCD_V,
189  FT_PIXEL_MODE_BGRA,
190 
191  FT_PIXEL_MODE_MAX /* do not remove */
192 
193  } FT_Pixel_Mode;
194 
195 
196  /* these constants are deprecated; use the corresponding `FT_Pixel_Mode' */
197  /* values instead. */
198 #define ft_pixel_mode_none FT_PIXEL_MODE_NONE
199 #define ft_pixel_mode_mono FT_PIXEL_MODE_MONO
200 #define ft_pixel_mode_grays FT_PIXEL_MODE_GRAY
201 #define ft_pixel_mode_pal2 FT_PIXEL_MODE_GRAY2
202 #define ft_pixel_mode_pal4 FT_PIXEL_MODE_GRAY4
203 
204 
205  /*************************************************************************/
206  /* */
207  /* <Struct> */
208  /* FT_Bitmap */
209  /* */
210  /* <Description> */
211  /* A structure used to describe a bitmap or pixmap to the raster. */
212  /* Note that we now manage pixmaps of various depths through the */
213  /* `pixel_mode' field. */
214  /* */
215  /* <Fields> */
216  /* rows :: The number of bitmap rows. */
217  /* */
218  /* width :: The number of pixels in bitmap row. */
219  /* */
220  /* pitch :: The pitch's absolute value is the number of bytes */
221  /* taken by one bitmap row, including padding. */
222  /* However, the pitch is positive when the bitmap has */
223  /* a `down' flow, and negative when it has an `up' */
224  /* flow. In all cases, the pitch is an offset to add */
225  /* to a bitmap pointer in order to go down one row. */
226  /* */
227  /* Note that `padding' means the alignment of a */
228  /* bitmap to a byte border, and FreeType functions */
229  /* normally align to the smallest possible integer */
230  /* value. */
231  /* */
232  /* For the B/W rasterizer, `pitch' is always an even */
233  /* number. */
234  /* */
235  /* To change the pitch of a bitmap (say, to make it a */
236  /* multiple of 4), use @FT_Bitmap_Convert. */
237  /* Alternatively, you might use callback functions to */
238  /* directly render to the application's surface; see */
239  /* the file `example2.cpp' in the tutorial for a */
240  /* demonstration. */
241  /* */
242  /* buffer :: A typeless pointer to the bitmap buffer. This */
243  /* value should be aligned on 32-bit boundaries in */
244  /* most cases. */
245  /* */
246  /* num_grays :: This field is only used with */
247  /* @FT_PIXEL_MODE_GRAY; it gives the number of gray */
248  /* levels used in the bitmap. */
249  /* */
250  /* pixel_mode :: The pixel mode, i.e., how pixel bits are stored. */
251  /* See @FT_Pixel_Mode for possible values. */
252  /* */
253  /* palette_mode :: This field is intended for paletted pixel modes; */
254  /* it indicates how the palette is stored. Not */
255  /* used currently. */
256  /* */
257  /* palette :: A typeless pointer to the bitmap palette; this */
258  /* field is intended for paletted pixel modes. Not */
259  /* used currently. */
260  /* */
261  typedef struct FT_Bitmap_
262  {
263  unsigned int rows;
264  unsigned int width;
265  int pitch;
266  unsigned char* buffer;
267  unsigned short num_grays;
268  unsigned char pixel_mode;
269  unsigned char palette_mode;
270  void* palette;
271 
272  } FT_Bitmap;
273 
274 
275  /*************************************************************************/
276  /* */
277  /* <Section> */
278  /* outline_processing */
279  /* */
280  /*************************************************************************/
281 
282 
283  /*************************************************************************/
284  /* */
285  /* <Struct> */
286  /* FT_Outline */
287  /* */
288  /* <Description> */
289  /* This structure is used to describe an outline to the scan-line */
290  /* converter. */
291  /* */
292  /* <Fields> */
293  /* n_contours :: The number of contours in the outline. */
294  /* */
295  /* n_points :: The number of points in the outline. */
296  /* */
297  /* points :: A pointer to an array of `n_points' @FT_Vector */
298  /* elements, giving the outline's point coordinates. */
299  /* */
300  /* tags :: A pointer to an array of `n_points' chars, giving */
301  /* each outline point's type. */
302  /* */
303  /* If bit~0 is unset, the point is `off' the curve, */
304  /* i.e., a Bezier control point, while it is `on' if */
305  /* set. */
306  /* */
307  /* Bit~1 is meaningful for `off' points only. If set, */
308  /* it indicates a third-order Bezier arc control point; */
309  /* and a second-order control point if unset. */
310  /* */
311  /* If bit~2 is set, bits 5-7 contain the drop-out mode */
312  /* (as defined in the OpenType specification; the value */
313  /* is the same as the argument to the SCANMODE */
314  /* instruction). */
315  /* */
316  /* Bits 3 and~4 are reserved for internal purposes. */
317  /* */
318  /* contours :: An array of `n_contours' shorts, giving the end */
319  /* point of each contour within the outline. For */
320  /* example, the first contour is defined by the points */
321  /* `0' to `contours[0]', the second one is defined by */
322  /* the points `contours[0]+1' to `contours[1]', etc. */
323  /* */
324  /* flags :: A set of bit flags used to characterize the outline */
325  /* and give hints to the scan-converter and hinter on */
326  /* how to convert/grid-fit it. See @FT_OUTLINE_XXX. */
327  /* */
328  /* <Note> */
329  /* The B/W rasterizer only checks bit~2 in the `tags' array for the */
330  /* first point of each contour. The drop-out mode as given with */
331  /* @FT_OUTLINE_IGNORE_DROPOUTS, @FT_OUTLINE_SMART_DROPOUTS, and */
332  /* @FT_OUTLINE_INCLUDE_STUBS in `flags' is then overridden. */
333  /* */
334  typedef struct FT_Outline_
335  {
336  short n_contours; /* number of contours in glyph */
337  short n_points; /* number of points in the glyph */
338 
339  FT_Vector* points; /* the outline's points */
340  char* tags; /* the points flags */
341  short* contours; /* the contour end points */
342 
343  int flags; /* outline masks */
344 
345  } FT_Outline;
346 
347  /* */
348 
349  /* Following limits must be consistent with */
350  /* FT_Outline.{n_contours,n_points} */
351 #define FT_OUTLINE_CONTOURS_MAX SHRT_MAX
352 #define FT_OUTLINE_POINTS_MAX SHRT_MAX
353 
354 
355  /*************************************************************************/
356  /* */
357  /* <Enum> */
358  /* FT_OUTLINE_XXX */
359  /* */
360  /* <Description> */
361  /* A list of bit-field constants use for the flags in an outline's */
362  /* `flags' field. */
363  /* */
364  /* <Values> */
365  /* FT_OUTLINE_NONE :: */
366  /* Value~0 is reserved. */
367  /* */
368  /* FT_OUTLINE_OWNER :: */
369  /* If set, this flag indicates that the outline's field arrays */
370  /* (i.e., `points', `flags', and `contours') are `owned' by the */
371  /* outline object, and should thus be freed when it is destroyed. */
372  /* */
373  /* FT_OUTLINE_EVEN_ODD_FILL :: */
374  /* By default, outlines are filled using the non-zero winding rule. */
375  /* If set to 1, the outline will be filled using the even-odd fill */
376  /* rule (only works with the smooth rasterizer). */
377  /* */
378  /* FT_OUTLINE_REVERSE_FILL :: */
379  /* By default, outside contours of an outline are oriented in */
380  /* clock-wise direction, as defined in the TrueType specification. */
381  /* This flag is set if the outline uses the opposite direction */
382  /* (typically for Type~1 fonts). This flag is ignored by the scan */
383  /* converter. */
384  /* */
385  /* FT_OUTLINE_IGNORE_DROPOUTS :: */
386  /* By default, the scan converter will try to detect drop-outs in */
387  /* an outline and correct the glyph bitmap to ensure consistent */
388  /* shape continuity. If set, this flag hints the scan-line */
389  /* converter to ignore such cases. See below for more information. */
390  /* */
391  /* FT_OUTLINE_SMART_DROPOUTS :: */
392  /* Select smart dropout control. If unset, use simple dropout */
393  /* control. Ignored if @FT_OUTLINE_IGNORE_DROPOUTS is set. See */
394  /* below for more information. */
395  /* */
396  /* FT_OUTLINE_INCLUDE_STUBS :: */
397  /* If set, turn pixels on for `stubs', otherwise exclude them. */
398  /* Ignored if @FT_OUTLINE_IGNORE_DROPOUTS is set. See below for */
399  /* more information. */
400  /* */
401  /* FT_OUTLINE_HIGH_PRECISION :: */
402  /* This flag indicates that the scan-line converter should try to */
403  /* convert this outline to bitmaps with the highest possible */
404  /* quality. It is typically set for small character sizes. Note */
405  /* that this is only a hint that might be completely ignored by a */
406  /* given scan-converter. */
407  /* */
408  /* FT_OUTLINE_SINGLE_PASS :: */
409  /* This flag is set to force a given scan-converter to only use a */
410  /* single pass over the outline to render a bitmap glyph image. */
411  /* Normally, it is set for very large character sizes. It is only */
412  /* a hint that might be completely ignored by a given */
413  /* scan-converter. */
414  /* */
415  /* <Note> */
416  /* The flags @FT_OUTLINE_IGNORE_DROPOUTS, @FT_OUTLINE_SMART_DROPOUTS, */
417  /* and @FT_OUTLINE_INCLUDE_STUBS are ignored by the smooth */
418  /* rasterizer. */
419  /* */
420  /* There exists a second mechanism to pass the drop-out mode to the */
421  /* B/W rasterizer; see the `tags' field in @FT_Outline. */
422  /* */
423  /* Please refer to the description of the `SCANTYPE' instruction in */
424  /* the OpenType specification (in file `ttinst1.doc') how simple */
425  /* drop-outs, smart drop-outs, and stubs are defined. */
426  /* */
427 #define FT_OUTLINE_NONE 0x0
428 #define FT_OUTLINE_OWNER 0x1
429 #define FT_OUTLINE_EVEN_ODD_FILL 0x2
430 #define FT_OUTLINE_REVERSE_FILL 0x4
431 #define FT_OUTLINE_IGNORE_DROPOUTS 0x8
432 #define FT_OUTLINE_SMART_DROPOUTS 0x10
433 #define FT_OUTLINE_INCLUDE_STUBS 0x20
434 
435 #define FT_OUTLINE_HIGH_PRECISION 0x100
436 #define FT_OUTLINE_SINGLE_PASS 0x200
437 
438 
439  /* these constants are deprecated; use the corresponding */
440  /* `FT_OUTLINE_XXX' values instead */
441 #define ft_outline_none FT_OUTLINE_NONE
442 #define ft_outline_owner FT_OUTLINE_OWNER
443 #define ft_outline_even_odd_fill FT_OUTLINE_EVEN_ODD_FILL
444 #define ft_outline_reverse_fill FT_OUTLINE_REVERSE_FILL
445 #define ft_outline_ignore_dropouts FT_OUTLINE_IGNORE_DROPOUTS
446 #define ft_outline_high_precision FT_OUTLINE_HIGH_PRECISION
447 #define ft_outline_single_pass FT_OUTLINE_SINGLE_PASS
448 
449  /* */
450 
451 #define FT_CURVE_TAG( flag ) ( flag & 3 )
452 
453 #define FT_CURVE_TAG_ON 1
454 #define FT_CURVE_TAG_CONIC 0
455 #define FT_CURVE_TAG_CUBIC 2
456 
457 #define FT_CURVE_TAG_HAS_SCANMODE 4
458 
459 #define FT_CURVE_TAG_TOUCH_X 8 /* reserved for the TrueType hinter */
460 #define FT_CURVE_TAG_TOUCH_Y 16 /* reserved for the TrueType hinter */
461 
462 #define FT_CURVE_TAG_TOUCH_BOTH ( FT_CURVE_TAG_TOUCH_X | \
463  FT_CURVE_TAG_TOUCH_Y )
464 
465 #define FT_Curve_Tag_On FT_CURVE_TAG_ON
466 #define FT_Curve_Tag_Conic FT_CURVE_TAG_CONIC
467 #define FT_Curve_Tag_Cubic FT_CURVE_TAG_CUBIC
468 #define FT_Curve_Tag_Touch_X FT_CURVE_TAG_TOUCH_X
469 #define FT_Curve_Tag_Touch_Y FT_CURVE_TAG_TOUCH_Y
470 
471 
472  /*************************************************************************/
473  /* */
474  /* <FuncType> */
475  /* FT_Outline_MoveToFunc */
476  /* */
477  /* <Description> */
478  /* A function pointer type used to describe the signature of a `move */
479  /* to' function during outline walking/decomposition. */
480  /* */
481  /* A `move to' is emitted to start a new contour in an outline. */
482  /* */
483  /* <Input> */
484  /* to :: A pointer to the target point of the `move to'. */
485  /* */
486  /* user :: A typeless pointer, which is passed from the caller of the */
487  /* decomposition function. */
488  /* */
489  /* <Return> */
490  /* Error code. 0~means success. */
491  /* */
492  typedef int
493  (*FT_Outline_MoveToFunc)( const FT_Vector* to,
494  void* user );
495 
496 #define FT_Outline_MoveTo_Func FT_Outline_MoveToFunc
497 
498 
499  /*************************************************************************/
500  /* */
501  /* <FuncType> */
502  /* FT_Outline_LineToFunc */
503  /* */
504  /* <Description> */
505  /* A function pointer type used to describe the signature of a `line */
506  /* to' function during outline walking/decomposition. */
507  /* */
508  /* A `line to' is emitted to indicate a segment in the outline. */
509  /* */
510  /* <Input> */
511  /* to :: A pointer to the target point of the `line to'. */
512  /* */
513  /* user :: A typeless pointer, which is passed from the caller of the */
514  /* decomposition function. */
515  /* */
516  /* <Return> */
517  /* Error code. 0~means success. */
518  /* */
519  typedef int
520  (*FT_Outline_LineToFunc)( const FT_Vector* to,
521  void* user );
522 
523 #define FT_Outline_LineTo_Func FT_Outline_LineToFunc
524 
525 
526  /*************************************************************************/
527  /* */
528  /* <FuncType> */
529  /* FT_Outline_ConicToFunc */
530  /* */
531  /* <Description> */
532  /* A function pointer type used to describe the signature of a `conic */
533  /* to' function during outline walking or decomposition. */
534  /* */
535  /* A `conic to' is emitted to indicate a second-order Bezier arc in */
536  /* the outline. */
537  /* */
538  /* <Input> */
539  /* control :: An intermediate control point between the last position */
540  /* and the new target in `to'. */
541  /* */
542  /* to :: A pointer to the target end point of the conic arc. */
543  /* */
544  /* user :: A typeless pointer, which is passed from the caller of */
545  /* the decomposition function. */
546  /* */
547  /* <Return> */
548  /* Error code. 0~means success. */
549  /* */
550  typedef int
551  (*FT_Outline_ConicToFunc)( const FT_Vector* control,
552  const FT_Vector* to,
553  void* user );
554 
555 #define FT_Outline_ConicTo_Func FT_Outline_ConicToFunc
556 
557 
558  /*************************************************************************/
559  /* */
560  /* <FuncType> */
561  /* FT_Outline_CubicToFunc */
562  /* */
563  /* <Description> */
564  /* A function pointer type used to describe the signature of a `cubic */
565  /* to' function during outline walking or decomposition. */
566  /* */
567  /* A `cubic to' is emitted to indicate a third-order Bezier arc. */
568  /* */
569  /* <Input> */
570  /* control1 :: A pointer to the first Bezier control point. */
571  /* */
572  /* control2 :: A pointer to the second Bezier control point. */
573  /* */
574  /* to :: A pointer to the target end point. */
575  /* */
576  /* user :: A typeless pointer, which is passed from the caller of */
577  /* the decomposition function. */
578  /* */
579  /* <Return> */
580  /* Error code. 0~means success. */
581  /* */
582  typedef int
583  (*FT_Outline_CubicToFunc)( const FT_Vector* control1,
584  const FT_Vector* control2,
585  const FT_Vector* to,
586  void* user );
587 
588 #define FT_Outline_CubicTo_Func FT_Outline_CubicToFunc
589 
590 
591  /*************************************************************************/
592  /* */
593  /* <Struct> */
594  /* FT_Outline_Funcs */
595  /* */
596  /* <Description> */
597  /* A structure to hold various function pointers used during outline */
598  /* decomposition in order to emit segments, conic, and cubic Beziers. */
599  /* */
600  /* <Fields> */
601  /* move_to :: The `move to' emitter. */
602  /* */
603  /* line_to :: The segment emitter. */
604  /* */
605  /* conic_to :: The second-order Bezier arc emitter. */
606  /* */
607  /* cubic_to :: The third-order Bezier arc emitter. */
608  /* */
609  /* shift :: The shift that is applied to coordinates before they */
610  /* are sent to the emitter. */
611  /* */
612  /* delta :: The delta that is applied to coordinates before they */
613  /* are sent to the emitter, but after the shift. */
614  /* */
615  /* <Note> */
616  /* The point coordinates sent to the emitters are the transformed */
617  /* version of the original coordinates (this is important for high */
618  /* accuracy during scan-conversion). The transformation is simple: */
619  /* */
620  /* { */
621  /* x' = (x << shift) - delta */
622  /* y' = (y << shift) - delta */
623  /* } */
624  /* */
625  /* Set the values of `shift' and `delta' to~0 to get the original */
626  /* point coordinates. */
627  /* */
628  typedef struct FT_Outline_Funcs_
629  {
630  FT_Outline_MoveToFunc move_to;
631  FT_Outline_LineToFunc line_to;
632  FT_Outline_ConicToFunc conic_to;
633  FT_Outline_CubicToFunc cubic_to;
634 
635  int shift;
636  FT_Pos delta;
637 
638  } FT_Outline_Funcs;
639 
640 
641  /*************************************************************************/
642  /* */
643  /* <Section> */
644  /* basic_types */
645  /* */
646  /*************************************************************************/
647 
648 
649  /*************************************************************************/
650  /* */
651  /* <Macro> */
652  /* FT_IMAGE_TAG */
653  /* */
654  /* <Description> */
655  /* This macro converts four-letter tags to an unsigned long type. */
656  /* */
657  /* <Note> */
658  /* Since many 16-bit compilers don't like 32-bit enumerations, you */
659  /* should redefine this macro in case of problems to something like */
660  /* this: */
661  /* */
662  /* { */
663  /* #define FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 ) value */
664  /* } */
665  /* */
666  /* to get a simple enumeration without assigning special numbers. */
667  /* */
668 #ifndef FT_IMAGE_TAG
669 #define FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 ) \
670  value = ( ( (unsigned long)_x1 << 24 ) | \
671  ( (unsigned long)_x2 << 16 ) | \
672  ( (unsigned long)_x3 << 8 ) | \
673  (unsigned long)_x4 )
674 #endif /* FT_IMAGE_TAG */
675 
676 
677  /*************************************************************************/
678  /* */
679  /* <Enum> */
680  /* FT_Glyph_Format */
681  /* */
682  /* <Description> */
683  /* An enumeration type used to describe the format of a given glyph */
684  /* image. Note that this version of FreeType only supports two image */
685  /* formats, even though future font drivers will be able to register */
686  /* their own format. */
687  /* */
688  /* <Values> */
689  /* FT_GLYPH_FORMAT_NONE :: */
690  /* The value~0 is reserved. */
691  /* */
692  /* FT_GLYPH_FORMAT_COMPOSITE :: */
693  /* The glyph image is a composite of several other images. This */
694  /* format is _only_ used with @FT_LOAD_NO_RECURSE, and is used to */
695  /* report compound glyphs (like accented characters). */
696  /* */
697  /* FT_GLYPH_FORMAT_BITMAP :: */
698  /* The glyph image is a bitmap, and can be described as an */
699  /* @FT_Bitmap. You generally need to access the `bitmap' field of */
700  /* the @FT_GlyphSlotRec structure to read it. */
701  /* */
702  /* FT_GLYPH_FORMAT_OUTLINE :: */
703  /* The glyph image is a vectorial outline made of line segments */
704  /* and Bezier arcs; it can be described as an @FT_Outline; you */
705  /* generally want to access the `outline' field of the */
706  /* @FT_GlyphSlotRec structure to read it. */
707  /* */
708  /* FT_GLYPH_FORMAT_PLOTTER :: */
709  /* The glyph image is a vectorial path with no inside and outside */
710  /* contours. Some Type~1 fonts, like those in the Hershey family, */
711  /* contain glyphs in this format. These are described as */
712  /* @FT_Outline, but FreeType isn't currently capable of rendering */
713  /* them correctly. */
714  /* */
715  typedef enum FT_Glyph_Format_
716  {
717  FT_IMAGE_TAG( FT_GLYPH_FORMAT_NONE, 0, 0, 0, 0 ),
718 
719  FT_IMAGE_TAG( FT_GLYPH_FORMAT_COMPOSITE, 'c', 'o', 'm', 'p' ),
720  FT_IMAGE_TAG( FT_GLYPH_FORMAT_BITMAP, 'b', 'i', 't', 's' ),
721  FT_IMAGE_TAG( FT_GLYPH_FORMAT_OUTLINE, 'o', 'u', 't', 'l' ),
722  FT_IMAGE_TAG( FT_GLYPH_FORMAT_PLOTTER, 'p', 'l', 'o', 't' )
723 
724  } FT_Glyph_Format;
725 
726 
727  /* these constants are deprecated; use the corresponding */
728  /* `FT_Glyph_Format' values instead. */
729 #define ft_glyph_format_none FT_GLYPH_FORMAT_NONE
730 #define ft_glyph_format_composite FT_GLYPH_FORMAT_COMPOSITE
731 #define ft_glyph_format_bitmap FT_GLYPH_FORMAT_BITMAP
732 #define ft_glyph_format_outline FT_GLYPH_FORMAT_OUTLINE
733 #define ft_glyph_format_plotter FT_GLYPH_FORMAT_PLOTTER
734 
735 
736  /*************************************************************************/
737  /*************************************************************************/
738  /*************************************************************************/
739  /***** *****/
740  /***** R A S T E R D E F I N I T I O N S *****/
741  /***** *****/
742  /*************************************************************************/
743  /*************************************************************************/
744  /*************************************************************************/
745 
746 
747  /*************************************************************************/
748  /* */
749  /* A raster is a scan converter, in charge of rendering an outline into */
750  /* a bitmap. This section contains the public API for rasters. */
751  /* */
752  /* Note that in FreeType 2, all rasters are now encapsulated within */
753  /* specific modules called `renderers'. See `ftrender.h' for more */
754  /* details on renderers. */
755  /* */
756  /*************************************************************************/
757 
758 
759  /*************************************************************************/
760  /* */
761  /* <Section> */
762  /* raster */
763  /* */
764  /* <Title> */
765  /* Scanline Converter */
766  /* */
767  /* <Abstract> */
768  /* How vectorial outlines are converted into bitmaps and pixmaps. */
769  /* */
770  /* <Description> */
771  /* This section contains technical definitions. */
772  /* */
773  /* <Order> */
774  /* FT_Raster */
775  /* FT_Span */
776  /* FT_SpanFunc */
777  /* */
778  /* FT_Raster_Params */
779  /* FT_RASTER_FLAG_XXX */
780  /* */
781  /* FT_Raster_NewFunc */
782  /* FT_Raster_DoneFunc */
783  /* FT_Raster_ResetFunc */
784  /* FT_Raster_SetModeFunc */
785  /* FT_Raster_RenderFunc */
786  /* FT_Raster_Funcs */
787  /* */
788  /*************************************************************************/
789 
790 
791  /*************************************************************************/
792  /* */
793  /* <Type> */
794  /* FT_Raster */
795  /* */
796  /* <Description> */
797  /* An opaque handle (pointer) to a raster object. Each object can be */
798  /* used independently to convert an outline into a bitmap or pixmap. */
799  /* */
800  typedef struct FT_RasterRec_* FT_Raster;
801 
802 
803  /*************************************************************************/
804  /* */
805  /* <Struct> */
806  /* FT_Span */
807  /* */
808  /* <Description> */
809  /* A structure used to model a single span of gray pixels when */
810  /* rendering an anti-aliased bitmap. */
811  /* */
812  /* <Fields> */
813  /* x :: The span's horizontal start position. */
814  /* */
815  /* len :: The span's length in pixels. */
816  /* */
817  /* coverage :: The span color/coverage, ranging from 0 (background) */
818  /* to 255 (foreground). */
819  /* */
820  /* <Note> */
821  /* This structure is used by the span drawing callback type named */
822  /* @FT_SpanFunc that takes the y~coordinate of the span as a */
823  /* parameter. */
824  /* */
825  /* The coverage value is always between 0 and 255. If you want less */
826  /* gray values, the callback function has to reduce them. */
827  /* */
828  typedef struct FT_Span_
829  {
830  short x;
831  unsigned short len;
832  unsigned char coverage;
833 
834  } FT_Span;
835 
836 
837  /*************************************************************************/
838  /* */
839  /* <FuncType> */
840  /* FT_SpanFunc */
841  /* */
842  /* <Description> */
843  /* A function used as a call-back by the anti-aliased renderer in */
844  /* order to let client applications draw themselves the gray pixel */
845  /* spans on each scan line. */
846  /* */
847  /* <Input> */
848  /* y :: The scanline's y~coordinate. */
849  /* */
850  /* count :: The number of spans to draw on this scanline. */
851  /* */
852  /* spans :: A table of `count' spans to draw on the scanline. */
853  /* */
854  /* user :: User-supplied data that is passed to the callback. */
855  /* */
856  /* <Note> */
857  /* This callback allows client applications to directly render the */
858  /* gray spans of the anti-aliased bitmap to any kind of surfaces. */
859  /* */
860  /* This can be used to write anti-aliased outlines directly to a */
861  /* given background bitmap, and even perform translucency. */
862  /* */
863  typedef void
864  (*FT_SpanFunc)( int y,
865  int count,
866  const FT_Span* spans,
867  void* user );
868 
869 #define FT_Raster_Span_Func FT_SpanFunc
870 
871 
872  /*************************************************************************/
873  /* */
874  /* <FuncType> */
875  /* FT_Raster_BitTest_Func */
876  /* */
877  /* <Description> */
878  /* Deprecated, unimplemented. */
879  /* */
880  typedef int
881  (*FT_Raster_BitTest_Func)( int y,
882  int x,
883  void* user );
884 
885 
886  /*************************************************************************/
887  /* */
888  /* <FuncType> */
889  /* FT_Raster_BitSet_Func */
890  /* */
891  /* <Description> */
892  /* Deprecated, unimplemented. */
893  /* */
894  typedef void
895  (*FT_Raster_BitSet_Func)( int y,
896  int x,
897  void* user );
898 
899 
900  /*************************************************************************/
901  /* */
902  /* <Enum> */
903  /* FT_RASTER_FLAG_XXX */
904  /* */
905  /* <Description> */
906  /* A list of bit flag constants as used in the `flags' field of a */
907  /* @FT_Raster_Params structure. */
908  /* */
909  /* <Values> */
910  /* FT_RASTER_FLAG_DEFAULT :: This value is 0. */
911  /* */
912  /* FT_RASTER_FLAG_AA :: This flag is set to indicate that an */
913  /* anti-aliased glyph image should be */
914  /* generated. Otherwise, it will be */
915  /* monochrome (1-bit). */
916  /* */
917  /* FT_RASTER_FLAG_DIRECT :: This flag is set to indicate direct */
918  /* rendering. In this mode, client */
919  /* applications must provide their own span */
920  /* callback. This lets them directly */
921  /* draw or compose over an existing bitmap. */
922  /* If this bit is not set, the target */
923  /* pixmap's buffer _must_ be zeroed before */
924  /* rendering. */
925  /* */
926  /* Direct rendering is only possible with */
927  /* anti-aliased glyphs. */
928  /* */
929  /* FT_RASTER_FLAG_CLIP :: This flag is only used in direct */
930  /* rendering mode. If set, the output will */
931  /* be clipped to a box specified in the */
932  /* `clip_box' field of the */
933  /* @FT_Raster_Params structure. */
934  /* */
935  /* Note that by default, the glyph bitmap */
936  /* is clipped to the target pixmap, except */
937  /* in direct rendering mode where all spans */
938  /* are generated if no clipping box is set. */
939  /* */
940 #define FT_RASTER_FLAG_DEFAULT 0x0
941 #define FT_RASTER_FLAG_AA 0x1
942 #define FT_RASTER_FLAG_DIRECT 0x2
943 #define FT_RASTER_FLAG_CLIP 0x4
944 
945  /* these constants are deprecated; use the corresponding */
946  /* `FT_RASTER_FLAG_XXX' values instead */
947 #define ft_raster_flag_default FT_RASTER_FLAG_DEFAULT
948 #define ft_raster_flag_aa FT_RASTER_FLAG_AA
949 #define ft_raster_flag_direct FT_RASTER_FLAG_DIRECT
950 #define ft_raster_flag_clip FT_RASTER_FLAG_CLIP
951 
952 
953  /*************************************************************************/
954  /* */
955  /* <Struct> */
956  /* FT_Raster_Params */
957  /* */
958  /* <Description> */
959  /* A structure to hold the arguments used by a raster's render */
960  /* function. */
961  /* */
962  /* <Fields> */
963  /* target :: The target bitmap. */
964  /* */
965  /* source :: A pointer to the source glyph image (e.g., an */
966  /* @FT_Outline). */
967  /* */
968  /* flags :: The rendering flags. */
969  /* */
970  /* gray_spans :: The gray span drawing callback. */
971  /* */
972  /* black_spans :: Unused. */
973  /* */
974  /* bit_test :: Unused. */
975  /* */
976  /* bit_set :: Unused. */
977  /* */
978  /* user :: User-supplied data that is passed to each drawing */
979  /* callback. */
980  /* */
981  /* clip_box :: An optional clipping box. It is only used in */
982  /* direct rendering mode. Note that coordinates here */
983  /* should be expressed in _integer_ pixels (and not in */
984  /* 26.6 fixed-point units). */
985  /* */
986  /* <Note> */
987  /* An anti-aliased glyph bitmap is drawn if the @FT_RASTER_FLAG_AA */
988  /* bit flag is set in the `flags' field, otherwise a monochrome */
989  /* bitmap is generated. */
990  /* */
991  /* If the @FT_RASTER_FLAG_DIRECT bit flag is set in `flags', the */
992  /* raster will call the `gray_spans' callback to draw gray pixel */
993  /* spans. This allows direct composition over a pre-existing bitmap */
994  /* through user-provided callbacks to perform the span drawing and */
995  /* composition. Not supported by the monochrome rasterizer. */
996  /* */
997  typedef struct FT_Raster_Params_
998  {
999  const FT_Bitmap* target;
1000  const void* source;
1001  int flags;
1002  FT_SpanFunc gray_spans;
1003  FT_SpanFunc black_spans; /* unused */
1004  FT_Raster_BitTest_Func bit_test; /* unused */
1005  FT_Raster_BitSet_Func bit_set; /* unused */
1006  void* user;
1007  FT_BBox clip_box;
1008 
1009  } FT_Raster_Params;
1010 
1011 
1012  /*************************************************************************/
1013  /* */
1014  /* <FuncType> */
1015  /* FT_Raster_NewFunc */
1016  /* */
1017  /* <Description> */
1018  /* A function used to create a new raster object. */
1019  /* */
1020  /* <Input> */
1021  /* memory :: A handle to the memory allocator. */
1022  /* */
1023  /* <Output> */
1024  /* raster :: A handle to the new raster object. */
1025  /* */
1026  /* <Return> */
1027  /* Error code. 0~means success. */
1028  /* */
1029  /* <Note> */
1030  /* The `memory' parameter is a typeless pointer in order to avoid */
1031  /* un-wanted dependencies on the rest of the FreeType code. In */
1032  /* practice, it is an @FT_Memory object, i.e., a handle to the */
1033  /* standard FreeType memory allocator. However, this field can be */
1034  /* completely ignored by a given raster implementation. */
1035  /* */
1036  typedef int
1037  (*FT_Raster_NewFunc)( void* memory,
1038  FT_Raster* raster );
1039 
1040 #define FT_Raster_New_Func FT_Raster_NewFunc
1041 
1042 
1043  /*************************************************************************/
1044  /* */
1045  /* <FuncType> */
1046  /* FT_Raster_DoneFunc */
1047  /* */
1048  /* <Description> */
1049  /* A function used to destroy a given raster object. */
1050  /* */
1051  /* <Input> */
1052  /* raster :: A handle to the raster object. */
1053  /* */
1054  typedef void
1055  (*FT_Raster_DoneFunc)( FT_Raster raster );
1056 
1057 #define FT_Raster_Done_Func FT_Raster_DoneFunc
1058 
1059 
1060  /*************************************************************************/
1061  /* */
1062  /* <FuncType> */
1063  /* FT_Raster_ResetFunc */
1064  /* */
1065  /* <Description> */
1066  /* FreeType used to provide an area of memory called the `render */
1067  /* pool' available to all registered rasterizers. This was not */
1068  /* thread safe, however, and now FreeType never allocates this pool. */
1069  /* */
1070  /* This function is called after a new raster object is created. */
1071  /* */
1072  /* <Input> */
1073  /* raster :: A handle to the new raster object. */
1074  /* */
1075  /* pool_base :: Previously, the address in memory of the render pool. */
1076  /* Set this to NULL. */
1077  /* */
1078  /* pool_size :: Previously, the size in bytes of the render pool. */
1079  /* Set this to 0. */
1080  /* */
1081  /* <Note> */
1082  /* Rasterizers should rely on dynamic or stack allocation if they */
1083  /* want to (a handle to the memory allocator is passed to the */
1084  /* rasterizer constructor). */
1085  /* */
1086  typedef void
1087  (*FT_Raster_ResetFunc)( FT_Raster raster,
1088  unsigned char* pool_base,
1089  unsigned long pool_size );
1090 
1091 #define FT_Raster_Reset_Func FT_Raster_ResetFunc
1092 
1093 
1094  /*************************************************************************/
1095  /* */
1096  /* <FuncType> */
1097  /* FT_Raster_SetModeFunc */
1098  /* */
1099  /* <Description> */
1100  /* This function is a generic facility to change modes or attributes */
1101  /* in a given raster. This can be used for debugging purposes, or */
1102  /* simply to allow implementation-specific `features' in a given */
1103  /* raster module. */
1104  /* */
1105  /* <Input> */
1106  /* raster :: A handle to the new raster object. */
1107  /* */
1108  /* mode :: A 4-byte tag used to name the mode or property. */
1109  /* */
1110  /* args :: A pointer to the new mode/property to use. */
1111  /* */
1112  typedef int
1113  (*FT_Raster_SetModeFunc)( FT_Raster raster,
1114  unsigned long mode,
1115  void* args );
1116 
1117 #define FT_Raster_Set_Mode_Func FT_Raster_SetModeFunc
1118 
1119 
1120  /*************************************************************************/
1121  /* */
1122  /* <FuncType> */
1123  /* FT_Raster_RenderFunc */
1124  /* */
1125  /* <Description> */
1126  /* Invoke a given raster to scan-convert a given glyph image into a */
1127  /* target bitmap. */
1128  /* */
1129  /* <Input> */
1130  /* raster :: A handle to the raster object. */
1131  /* */
1132  /* params :: A pointer to an @FT_Raster_Params structure used to */
1133  /* store the rendering parameters. */
1134  /* */
1135  /* <Return> */
1136  /* Error code. 0~means success. */
1137  /* */
1138  /* <Note> */
1139  /* The exact format of the source image depends on the raster's glyph */
1140  /* format defined in its @FT_Raster_Funcs structure. It can be an */
1141  /* @FT_Outline or anything else in order to support a large array of */
1142  /* glyph formats. */
1143  /* */
1144  /* Note also that the render function can fail and return a */
1145  /* `FT_Err_Unimplemented_Feature' error code if the raster used does */
1146  /* not support direct composition. */
1147  /* */
1148  /* XXX: For now, the standard raster doesn't support direct */
1149  /* composition but this should change for the final release (see */
1150  /* the files `demos/src/ftgrays.c' and `demos/src/ftgrays2.c' */
1151  /* for examples of distinct implementations that support direct */
1152  /* composition). */
1153  /* */
1154  typedef int
1155  (*FT_Raster_RenderFunc)( FT_Raster raster,
1156  const FT_Raster_Params* params );
1157 
1158 #define FT_Raster_Render_Func FT_Raster_RenderFunc
1159 
1160 
1161  /*************************************************************************/
1162  /* */
1163  /* <Struct> */
1164  /* FT_Raster_Funcs */
1165  /* */
1166  /* <Description> */
1167  /* A structure used to describe a given raster class to the library. */
1168  /* */
1169  /* <Fields> */
1170  /* glyph_format :: The supported glyph format for this raster. */
1171  /* */
1172  /* raster_new :: The raster constructor. */
1173  /* */
1174  /* raster_reset :: Used to reset the render pool within the raster. */
1175  /* */
1176  /* raster_render :: A function to render a glyph into a given bitmap. */
1177  /* */
1178  /* raster_done :: The raster destructor. */
1179  /* */
1180  typedef struct FT_Raster_Funcs_
1181  {
1182  FT_Glyph_Format glyph_format;
1183 
1184  FT_Raster_NewFunc raster_new;
1185  FT_Raster_ResetFunc raster_reset;
1186  FT_Raster_SetModeFunc raster_set_mode;
1187  FT_Raster_RenderFunc raster_render;
1188  FT_Raster_DoneFunc raster_done;
1189 
1190  } FT_Raster_Funcs;
1191 
1192  /* */
1193 
1194 
1195 FT_END_HEADER
1196 
1197 #endif /* FTIMAGE_H_ */
1198 
1199 
1200 /* END */
1201 
1202 
1203 /* Local Variables: */
1204 /* coding: utf-8 */
1205 /* End: */
FT_Span_
Definition: ftimage.h:828
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