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39
40/***************************************************************************/
41/* */
42/* ftimage.h */
43/* */
44/* FreeType glyph image formats and default raster interface */
45/* (specification). */
46/* */
47/* Copyright 1996-2001, 2002, 2003, 2004 by */
48/* David Turner, Robert Wilhelm, and Werner Lemberg. */
49/* */
50/* This file is part of the FreeType project, and may only be used, */
51/* modified, and distributed under the terms of the FreeType project */
52/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
53/* this file you indicate that you have read the license and */
54/* understand and accept it fully. */
55/* */
56/***************************************************************************/
57
58 /*************************************************************************/
59 /* */
60 /* Note: A `raster' is simply a scan-line converter, used to render */
61 /* QT_FT_Outlines into QT_FT_Bitmaps. */
62 /* */
63 /*************************************************************************/
64
65
66#ifndef __QT_FTIMAGE_H__
67#define __QT_FTIMAGE_H__
68
69/*
70// W A R N I N G
71// -------------
72//
73// This file is not part of the Qt API. It exists purely as an
74// implementation detail. This header file may change from version to
75// version without notice, or even be removed.
76//
77// We mean it.
78*/
79
80QT_FT_BEGIN_HEADER
81
82 /*************************************************************************/
83 /* */
84 /* <Section> */
85 /* basic_types */
86 /* */
87 /*************************************************************************/
88
89
90 /*************************************************************************/
91 /* */
92 /* <Type> */
93 /* QT_FT_Pos */
94 /* */
95 /* <Description> */
96 /* The type QT_FT_Pos is a 32-bit integer used to store vectorial */
97 /* coordinates. Depending on the context, these can represent */
98 /* distances in integer font units, or 16,16, or 26.6 fixed float */
99 /* pixel coordinates. */
100 /* */
101 typedef signed int QT_FT_Pos;
102
103
104 /*************************************************************************/
105 /* */
106 /* <Struct> */
107 /* QT_FT_Vector */
108 /* */
109 /* <Description> */
110 /* A simple structure used to store a 2D vector; coordinates are of */
111 /* the QT_FT_Pos type. */
112 /* */
113 /* <Fields> */
114 /* x :: The horizontal coordinate. */
115 /* y :: The vertical coordinate. */
116 /* */
117 typedef struct QT_FT_Vector_
118 {
119 QT_FT_Pos x;
120 QT_FT_Pos y;
121
122 } QT_FT_Vector;
123
124
125 /*************************************************************************/
126 /* */
127 /* <Struct> */
128 /* QT_FT_BBox */
129 /* */
130 /* <Description> */
131 /* A structure used to hold an outline's bounding box, i.e., the */
132 /* coordinates of its extrema in the horizontal and vertical */
133 /* directions. */
134 /* */
135 /* <Fields> */
136 /* xMin :: The horizontal minimum (left-most). */
137 /* */
138 /* yMin :: The vertical minimum (bottom-most). */
139 /* */
140 /* xMax :: The horizontal maximum (right-most). */
141 /* */
142 /* yMax :: The vertical maximum (top-most). */
143 /* */
144 typedef struct QT_FT_BBox_
145 {
146 QT_FT_Pos xMin, yMin;
147 QT_FT_Pos xMax, yMax;
148
149 } QT_FT_BBox;
150
151
152 /*************************************************************************/
153 /* */
154 /* <Enum> */
155 /* QT_FT_Pixel_Mode */
156 /* */
157 /* <Description> */
158 /* An enumeration type used to describe the format of pixels in a */
159 /* given bitmap. Note that additional formats may be added in the */
160 /* future. */
161 /* */
162 /* <Values> */
163 /* QT_FT_PIXEL_MODE_NONE :: */
164 /* Value 0 is reserved. */
165 /* */
166 /* QT_FT_PIXEL_MODE_MONO :: */
167 /* A monochrome bitmap, using 1 bit per pixel. Note that pixels */
168 /* are stored in most-significant order (MSB), which means that */
169 /* the left-most pixel in a byte has value 128. */
170 /* */
171 /* QT_FT_PIXEL_MODE_GRAY :: */
172 /* An 8-bit bitmap, generally used to represent anti-aliased glyph */
173 /* images. Each pixel is stored in one byte. Note that the number */
174 /* of value "gray" levels is stored in the `num_bytes' field of */
175 /* the @QT_FT_Bitmap structure (it generally is 256). */
176 /* */
177 /* QT_FT_PIXEL_MODE_GRAY2 :: */
178 /* A 2-bit/pixel bitmap, used to represent embedded anti-aliased */
179 /* bitmaps in font files according to the OpenType specification. */
180 /* We haven't found a single font using this format, however. */
181 /* */
182 /* QT_FT_PIXEL_MODE_GRAY4 :: */
183 /* A 4-bit/pixel bitmap, used to represent embedded anti-aliased */
184 /* bitmaps in font files according to the OpenType specification. */
185 /* We haven't found a single font using this format, however. */
186 /* */
187 /* QT_FT_PIXEL_MODE_LCD :: */
188 /* An 8-bit bitmap, used to represent RGB or BGR decimated glyph */
189 /* images used for display on LCD displays; the bitmap's width is */
190 /* three times wider than the original glyph image. See also */
191 /* @QT_FT_RENDER_MODE_LCD. */
192 /* */
193 /* QT_FT_PIXEL_MODE_LCD_V :: */
194 /* An 8-bit bitmap, used to represent RGB or BGR decimated glyph */
195 /* images used for display on rotated LCD displays; the bitmap's */
196 /* height is three times taller than the original glyph image. */
197 /* See also @QT_FT_RENDER_MODE_LCD_V. */
198 /* */
199 typedef enum QT_FT_Pixel_Mode_
200 {
201 QT_FT_PIXEL_MODE_NONE = 0,
202 QT_FT_PIXEL_MODE_MONO,
203 QT_FT_PIXEL_MODE_GRAY,
204 QT_FT_PIXEL_MODE_GRAY2,
205 QT_FT_PIXEL_MODE_GRAY4,
206 QT_FT_PIXEL_MODE_LCD,
207 QT_FT_PIXEL_MODE_LCD_V,
208
209 QT_FT_PIXEL_MODE_MAX /* do not remove */
210
211 } QT_FT_Pixel_Mode;
212
213
214 /*************************************************************************/
215 /* */
216 /* <Enum> */
217 /* qt_ft_pixel_mode_xxx */
218 /* */
219 /* <Description> */
220 /* A list of deprecated constants. Use the corresponding */
221 /* @QT_FT_Pixel_Mode values instead. */
222 /* */
223 /* <Values> */
224 /* qt_ft_pixel_mode_none :: see @QT_FT_PIXEL_MODE_NONE */
225 /* qt_ft_pixel_mode_mono :: see @QT_FT_PIXEL_MODE_MONO */
226 /* qt_ft_pixel_mode_grays :: see @QT_FT_PIXEL_MODE_GRAY */
227 /* qt_ft_pixel_mode_pal2 :: see @QT_FT_PIXEL_MODE_GRAY2 */
228 /* qt_ft_pixel_mode_pal4 :: see @QT_FT_PIXEL_MODE_GRAY4 */
229 /* */
230#define qt_ft_pixel_mode_none QT_FT_PIXEL_MODE_NONE
231#define qt_ft_pixel_mode_mono QT_FT_PIXEL_MODE_MONO
232#define qt_ft_pixel_mode_grays QT_FT_PIXEL_MODE_GRAY
233#define qt_ft_pixel_mode_pal2 QT_FT_PIXEL_MODE_GRAY2
234#define qt_ft_pixel_mode_pal4 QT_FT_PIXEL_MODE_GRAY4
235
236 /* */
237
238#if 0
239
240 /*************************************************************************/
241 /* */
242 /* <Enum> */
243 /* QT_FT_Palette_Mode */
244 /* */
245 /* <Description> */
246 /* THIS TYPE IS DEPRECATED. DO NOT USE IT! */
247 /* */
248 /* An enumeration type used to describe the format of a bitmap */
249 /* palette, used with qt_ft_pixel_mode_pal4 and qt_ft_pixel_mode_pal8. */
250 /* */
251 /* <Fields> */
252 /* qt_ft_palette_mode_rgb :: The palette is an array of 3-bytes RGB */
253 /* records. */
254 /* */
255 /* qt_ft_palette_mode_rgba :: The palette is an array of 4-bytes RGBA */
256 /* records. */
257 /* */
258 /* <Note> */
259 /* As qt_ft_pixel_mode_pal2, pal4 and pal8 are currently unused by */
260 /* FreeType, these types are not handled by the library itself. */
261 /* */
262 typedef enum QT_FT_Palette_Mode_
263 {
264 qt_ft_palette_mode_rgb = 0,
265 qt_ft_palette_mode_rgba,
266
267 qt_ft_palettte_mode_max /* do not remove */
268
269 } QT_FT_Palette_Mode;
270
271 /* */
272
273#endif
274
275
276 /*************************************************************************/
277 /* */
278 /* <Struct> */
279 /* QT_FT_Bitmap */
280 /* */
281 /* <Description> */
282 /* A structure used to describe a bitmap or pixmap to the raster. */
283 /* Note that we now manage pixmaps of various depths through the */
284 /* `pixel_mode' field. */
285 /* */
286 /* <Fields> */
287 /* rows :: The number of bitmap rows. */
288 /* */
289 /* width :: The number of pixels in bitmap row. */
290 /* */
291 /* pitch :: The pitch's absolute value is the number of bytes */
292 /* taken by one bitmap row, including padding. */
293 /* However, the pitch is positive when the bitmap has */
294 /* a `down' flow, and negative when it has an `up' */
295 /* flow. In all cases, the pitch is an offset to add */
296 /* to a bitmap pointer in order to go down one row. */
297 /* */
298 /* buffer :: A typeless pointer to the bitmap buffer. This */
299 /* value should be aligned on 32-bit boundaries in */
300 /* most cases. */
301 /* */
302 /* num_grays :: This field is only used with */
303 /* `QT_FT_PIXEL_MODE_GRAY'; it gives the number of gray */
304 /* levels used in the bitmap. */
305 /* */
306 /* pixel_mode :: The pixel mode, i.e., how pixel bits are stored. */
307 /* See @QT_FT_Pixel_Mode for possible values. */
308 /* */
309 /* palette_mode :: This field is only used with paletted pixel modes; */
310 /* it indicates how the palette is stored. */
311 /* */
312 /* palette :: A typeless pointer to the bitmap palette; only */
313 /* used for paletted pixel modes. */
314 /* */
315 /* <Note> */
316 /* For now, the only pixel mode supported by FreeType are mono and */
317 /* grays. However, drivers might be added in the future to support */
318 /* more `colorful' options. */
319 /* */
320 /* When using pixel modes pal2, pal4 and pal8 with a void `palette' */
321 /* field, a gray pixmap with respectively 4, 16, and 256 levels of */
322 /* gray is assumed. This, in order to be compatible with some */
323 /* embedded bitmap formats defined in the TrueType specification. */
324 /* */
325 /* Note that no font was found presenting such embedded bitmaps, so */
326 /* this is currently completely unhandled by the library. */
327 /* */
328 typedef struct QT_FT_Bitmap_
329 {
330 int rows;
331 int width;
332 int pitch;
333 unsigned char* buffer;
334 short num_grays;
335 char pixel_mode;
336 char palette_mode;
337 void* palette;
338
339 } QT_FT_Bitmap;
340
341
342 /*************************************************************************/
343 /* */
344 /* <Section> */
345 /* outline_processing */
346 /* */
347 /*************************************************************************/
348
349
350 /*************************************************************************/
351 /* */
352 /* <Struct> */
353 /* QT_FT_Outline */
354 /* */
355 /* <Description> */
356 /* This structure is used to describe an outline to the scan-line */
357 /* converter. */
358 /* */
359 /* <Fields> */
360 /* n_contours :: The number of contours in the outline. */
361 /* */
362 /* n_points :: The number of points in the outline. */
363 /* */
364 /* points :: A pointer to an array of `n_points' QT_FT_Vector */
365 /* elements, giving the outline's point coordinates. */
366 /* */
367 /* tags :: A pointer to an array of `n_points' chars, giving */
368 /* each outline point's type. If bit 0 is unset, the */
369 /* point is `off' the curve, i.e. a Bezier control */
370 /* point, while it is `on' when set. */
371 /* */
372 /* Bit 1 is meaningful for `off' points only. If set, */
373 /* it indicates a third-order Bezier arc control point; */
374 /* and a second-order control point if unset. */
375 /* */
376 /* contours :: An array of `n_contours' shorts, giving the end */
377 /* point of each contour within the outline. For */
378 /* example, the first contour is defined by the points */
379 /* `0' to `contours[0]', the second one is defined by */
380 /* the points `contours[0]+1' to `contours[1]', etc. */
381 /* */
382 /* flags :: A set of bit flags used to characterize the outline */
383 /* and give hints to the scan-converter and hinter on */
384 /* how to convert/grid-fit it. See QT_FT_Outline_Flags. */
385 /* */
386 typedef struct QT_FT_Outline_
387 {
388 int n_contours; /* number of contours in glyph */
389 int n_points; /* number of points in the glyph */
390
391 QT_FT_Vector* points; /* the outline's points */
392 char* tags; /* the points flags */
393 int* contours; /* the contour end points */
394
395 int flags; /* outline masks */
396
397 } QT_FT_Outline;
398
399
400 /*************************************************************************/
401 /* */
402 /* <Enum> */
403 /* QT_FT_OUTLINE_FLAGS */
404 /* */
405 /* <Description> */
406 /* A list of bit-field constants use for the flags in an outline's */
407 /* `flags' field. */
408 /* */
409 /* <Values> */
410 /* QT_FT_OUTLINE_NONE :: Value 0 is reserved. */
411 /* */
412 /* QT_FT_OUTLINE_OWNER :: If set, this flag indicates that the */
413 /* outline's field arrays (i.e. */
414 /* `points', `flags' & `contours') are */
415 /* `owned' by the outline object, and */
416 /* should thus be freed when it is */
417 /* destroyed. */
418 /* */
419 /* QT_FT_OUTLINE_EVEN_ODD_FILL :: By default, outlines are filled using */
420 /* the non-zero winding rule. If set to */
421 /* 1, the outline will be filled using */
422 /* the even-odd fill rule (only works */
423 /* with the smooth raster). */
424 /* */
425 /* QT_FT_OUTLINE_REVERSE_FILL :: By default, outside contours of an */
426 /* outline are oriented in clock-wise */
427 /* direction, as defined in the TrueType */
428 /* specification. This flag is set if */
429 /* the outline uses the opposite */
430 /* direction (typically for Type 1 */
431 /* fonts). This flag is ignored by the */
432 /* scan-converter. However, it is very */
433 /* important for the auto-hinter. */
434 /* */
435 /* QT_FT_OUTLINE_IGNORE_DROPOUTS :: By default, the scan converter will */
436 /* try to detect drop-outs in an outline */
437 /* and correct the glyph bitmap to */
438 /* ensure consistent shape continuity. */
439 /* If set, this flag hints the scan-line */
440 /* converter to ignore such cases. */
441 /* */
442 /* QT_FT_OUTLINE_HIGH_PRECISION :: This flag indicates that the */
443 /* scan-line converter should try to */
444 /* convert this outline to bitmaps with */
445 /* the highest possible quality. It is */
446 /* typically set for small character */
447 /* sizes. Note that this is only a */
448 /* hint, that might be completely */
449 /* ignored by a given scan-converter. */
450 /* */
451 /* QT_FT_OUTLINE_SINGLE_PASS :: This flag is set to force a given */
452 /* scan-converter to only use a single */
453 /* pass over the outline to render a */
454 /* bitmap glyph image. Normally, it is */
455 /* set for very large character sizes. */
456 /* It is only a hint, that might be */
457 /* completely ignored by a given */
458 /* scan-converter. */
459 /* */
460#define QT_FT_OUTLINE_NONE 0x0
461#define QT_FT_OUTLINE_OWNER 0x1
462#define QT_FT_OUTLINE_EVEN_ODD_FILL 0x2
463#define QT_FT_OUTLINE_REVERSE_FILL 0x4
464#define QT_FT_OUTLINE_IGNORE_DROPOUTS 0x8
465
466#define QT_FT_OUTLINE_HIGH_PRECISION 0x100
467#define QT_FT_OUTLINE_SINGLE_PASS 0x200
468
469
470 /*************************************************************************
471 *
472 * @enum:
473 * qt_ft_outline_flags
474 *
475 * @description:
476 * These constants are deprecated. Please use the corresponding
477 * @QT_FT_OUTLINE_FLAGS values.
478 *
479 * @values:
480 * qt_ft_outline_none :: See @QT_FT_OUTLINE_NONE.
481 * qt_ft_outline_owner :: See @QT_FT_OUTLINE_OWNER.
482 * qt_ft_outline_even_odd_fill :: See @QT_FT_OUTLINE_EVEN_ODD_FILL.
483 * qt_ft_outline_reverse_fill :: See @QT_FT_OUTLINE_REVERSE_FILL.
484 * qt_ft_outline_ignore_dropouts :: See @QT_FT_OUTLINE_IGNORE_DROPOUTS.
485 * qt_ft_outline_high_precision :: See @QT_FT_OUTLINE_HIGH_PRECISION.
486 * qt_ft_outline_single_pass :: See @QT_FT_OUTLINE_SINGLE_PASS.
487 */
488#define qt_ft_outline_none QT_FT_OUTLINE_NONE
489#define qt_ft_outline_owner QT_FT_OUTLINE_OWNER
490#define qt_ft_outline_even_odd_fill QT_FT_OUTLINE_EVEN_ODD_FILL
491#define qt_ft_outline_reverse_fill QT_FT_OUTLINE_REVERSE_FILL
492#define qt_ft_outline_ignore_dropouts QT_FT_OUTLINE_IGNORE_DROPOUTS
493#define qt_ft_outline_high_precision QT_FT_OUTLINE_HIGH_PRECISION
494#define qt_ft_outline_single_pass QT_FT_OUTLINE_SINGLE_PASS
495
496 /* */
497
498#define QT_FT_CURVE_TAG( flag ) ( flag & 3 )
499
500#define QT_FT_CURVE_TAG_ON 1
501#define QT_FT_CURVE_TAG_CONIC 0
502#define QT_FT_CURVE_TAG_CUBIC 2
503
504#define QT_FT_CURVE_TAG_TOUCH_X 8 /* reserved for the TrueType hinter */
505#define QT_FT_CURVE_TAG_TOUCH_Y 16 /* reserved for the TrueType hinter */
506
507#define QT_FT_CURVE_TAG_TOUCH_BOTH ( QT_FT_CURVE_TAG_TOUCH_X | \
508 QT_FT_CURVE_TAG_TOUCH_Y )
509
510#define QT_FT_Curve_Tag_On QT_FT_CURVE_TAG_ON
511#define QT_FT_Curve_Tag_Conic QT_FT_CURVE_TAG_CONIC
512#define QT_FT_Curve_Tag_Cubic QT_FT_CURVE_TAG_CUBIC
513#define QT_FT_Curve_Tag_Touch_X QT_FT_CURVE_TAG_TOUCH_X
514#define QT_FT_Curve_Tag_Touch_Y QT_FT_CURVE_TAG_TOUCH_Y
515
516 /*************************************************************************/
517 /* */
518 /* <FuncType> */
519 /* QT_FT_Outline_MoveToFunc */
520 /* */
521 /* <Description> */
522 /* A function pointer type used to describe the signature of a `move */
523 /* to' function during outline walking/decomposition. */
524 /* */
525 /* A `move to' is emitted to start a new contour in an outline. */
526 /* */
527 /* <Input> */
528 /* to :: A pointer to the target point of the `move to'. */
529 /* */
530 /* user :: A typeless pointer which is passed from the caller of the */
531 /* decomposition function. */
532 /* */
533 /* <Return> */
534 /* Error code. 0 means success. */
535 /* */
536 typedef int
537 (*QT_FT_Outline_MoveToFunc)( QT_FT_Vector* to,
538 void* user );
539
540#define QT_FT_Outline_MoveTo_Func QT_FT_Outline_MoveToFunc
541
542 /*************************************************************************/
543 /* */
544 /* <FuncType> */
545 /* QT_FT_Outline_LineToFunc */
546 /* */
547 /* <Description> */
548 /* A function pointer type used to describe the signature of a `line */
549 /* to' function during outline walking/decomposition. */
550 /* */
551 /* A `line to' is emitted to indicate a segment in the outline. */
552 /* */
553 /* <Input> */
554 /* to :: A pointer to the target point of the `line to'. */
555 /* */
556 /* user :: A typeless pointer which is passed from the caller of the */
557 /* decomposition function. */
558 /* */
559 /* <Return> */
560 /* Error code. 0 means success. */
561 /* */
562 typedef int
563 (*QT_FT_Outline_LineToFunc)( QT_FT_Vector* to,
564 void* user );
565
566#define QT_FT_Outline_LineTo_Func QT_FT_Outline_LineToFunc
567
568 /*************************************************************************/
569 /* */
570 /* <FuncType> */
571 /* QT_FT_Outline_ConicToFunc */
572 /* */
573 /* <Description> */
574 /* A function pointer type use to describe the signature of a `conic */
575 /* to' function during outline walking/decomposition. */
576 /* */
577 /* A `conic to' is emitted to indicate a second-order Bezier arc in */
578 /* the outline. */
579 /* */
580 /* <Input> */
581 /* control :: An intermediate control point between the last position */
582 /* and the new target in `to'. */
583 /* */
584 /* to :: A pointer to the target end point of the conic arc. */
585 /* */
586 /* user :: A typeless pointer which is passed from the caller of */
587 /* the decomposition function. */
588 /* */
589 /* <Return> */
590 /* Error code. 0 means success. */
591 /* */
592 typedef int
593 (*QT_FT_Outline_ConicToFunc)( QT_FT_Vector* control,
594 QT_FT_Vector* to,
595 void* user );
596
597#define QT_FT_Outline_ConicTo_Func QT_FT_Outline_ConicToFunc
598
599 /*************************************************************************/
600 /* */
601 /* <FuncType> */
602 /* QT_FT_Outline_CubicToFunc */
603 /* */
604 /* <Description> */
605 /* A function pointer type used to describe the signature of a `cubic */
606 /* to' function during outline walking/decomposition. */
607 /* */
608 /* A `cubic to' is emitted to indicate a third-order Bezier arc. */
609 /* */
610 /* <Input> */
611 /* control1 :: A pointer to the first Bezier control point. */
612 /* */
613 /* control2 :: A pointer to the second Bezier control point. */
614 /* */
615 /* to :: A pointer to the target end point. */
616 /* */
617 /* user :: A typeless pointer which is passed from the caller of */
618 /* the decomposition function. */
619 /* */
620 /* <Return> */
621 /* Error code. 0 means success. */
622 /* */
623 typedef int
624 (*QT_FT_Outline_CubicToFunc)( QT_FT_Vector* control1,
625 QT_FT_Vector* control2,
626 QT_FT_Vector* to,
627 void* user );
628
629#define QT_FT_Outline_CubicTo_Func QT_FT_Outline_CubicToFunc
630
631
632 /*************************************************************************/
633 /* */
634 /* <Struct> */
635 /* QT_FT_Outline_Funcs */
636 /* */
637 /* <Description> */
638 /* A structure to hold various function pointers used during outline */
639 /* decomposition in order to emit segments, conic, and cubic Beziers, */
640 /* as well as `move to' and `close to' operations. */
641 /* */
642 /* <Fields> */
643 /* move_to :: The `move to' emitter. */
644 /* */
645 /* line_to :: The segment emitter. */
646 /* */
647 /* conic_to :: The second-order Bezier arc emitter. */
648 /* */
649 /* cubic_to :: The third-order Bezier arc emitter. */
650 /* */
651 /* shift :: The shift that is applied to coordinates before they */
652 /* are sent to the emitter. */
653 /* */
654 /* delta :: The delta that is applied to coordinates before they */
655 /* are sent to the emitter, but after the shift. */
656 /* */
657 /* <Note> */
658 /* The point coordinates sent to the emitters are the transformed */
659 /* version of the original coordinates (this is important for high */
660 /* accuracy during scan-conversion). The transformation is simple: */
661 /* */
662 /* x' = (x << shift) - delta */
663 /* y' = (x << shift) - delta */
664 /* */
665 /* Set the value of `shift' and `delta' to 0 to get the original */
666 /* point coordinates. */
667 /* */
668 typedef struct QT_FT_Outline_Funcs_
669 {
670 QT_FT_Outline_MoveToFunc move_to;
671 QT_FT_Outline_LineToFunc line_to;
672 QT_FT_Outline_ConicToFunc conic_to;
673 QT_FT_Outline_CubicToFunc cubic_to;
674
675 int shift;
676 QT_FT_Pos delta;
677
678 } QT_FT_Outline_Funcs;
679
680
681 /*************************************************************************/
682 /* */
683 /* <Section> */
684 /* basic_types */
685 /* */
686 /*************************************************************************/
687
688
689 /*************************************************************************/
690 /* */
691 /* <Macro> */
692 /* QT_FT_IMAGE_TAG */
693 /* */
694 /* <Description> */
695 /* This macro converts four letter tags into an unsigned long. */
696 /* */
697 /* <Note> */
698 /* Since many 16bit compilers don't like 32bit enumerations, you */
699 /* should redefine this macro in case of problems to something like */
700 /* this: */
701 /* */
702 /* #define QT_FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 ) value */
703 /* */
704 /* to get a simple enumeration without assigning special numbers. */
705 /* */
706#ifndef QT_FT_IMAGE_TAG
707#define QT_FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 ) \
708 value = ( ( (unsigned long)_x1 << 24 ) | \
709 ( (unsigned long)_x2 << 16 ) | \
710 ( (unsigned long)_x3 << 8 ) | \
711 (unsigned long)_x4 )
712#endif /* QT_FT_IMAGE_TAG */
713
714
715 /*************************************************************************/
716 /* */
717 /* <Enum> */
718 /* QT_FT_Glyph_Format */
719 /* */
720 /* <Description> */
721 /* An enumeration type used to describe the format of a given glyph */
722 /* image. Note that this version of FreeType only supports two image */
723 /* formats, even though future font drivers will be able to register */
724 /* their own format. */
725 /* */
726 /* <Values> */
727 /* QT_FT_GLYPH_FORMAT_NONE :: */
728 /* The value 0 is reserved and does describe a glyph format. */
729 /* */
730 /* QT_FT_GLYPH_FORMAT_COMPOSITE :: */
731 /* The glyph image is a composite of several other images. This */
732 /* format is _only_ used with @QT_FT_LOAD_NO_RECURSE, and is used to */
733 /* report compound glyphs (like accented characters). */
734 /* */
735 /* QT_FT_GLYPH_FORMAT_BITMAP :: */
736 /* The glyph image is a bitmap, and can be described as an */
737 /* @QT_FT_Bitmap. You generally need to access the `bitmap' field of */
738 /* the @QT_FT_GlyphSlotRec structure to read it. */
739 /* */
740 /* QT_FT_GLYPH_FORMAT_OUTLINE :: */
741 /* The glyph image is a vertorial outline made of line segments */
742 /* and Bezier arcs; it can be described as an @QT_FT_Outline; you */
743 /* generally want to access the `outline' field of the */
744 /* @QT_FT_GlyphSlotRec structure to read it. */
745 /* */
746 /* QT_FT_GLYPH_FORMAT_PLOTTER :: */
747 /* The glyph image is a vectorial path with no inside/outside */
748 /* contours. Some Type 1 fonts, like those in the Hershey family, */
749 /* contain glyphs in this format. These are described as */
750 /* @QT_FT_Outline, but FreeType isn't currently capable of rendering */
751 /* them correctly. */
752 /* */
753 typedef enum QT_FT_Glyph_Format_
754 {
755 QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_NONE, 0, 0, 0, 0 ),
756
757 QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_COMPOSITE, 'c', 'o', 'm', 'p' ),
758 QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_BITMAP, 'b', 'i', 't', 's' ),
759 QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_OUTLINE, 'o', 'u', 't', 'l' ),
760 QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_PLOTTER, 'p', 'l', 'o', 't' )
761
762 } QT_FT_Glyph_Format;
763
764
765 /*************************************************************************/
766 /* */
767 /* <Enum> */
768 /* qt_ft_glyph_format_xxx */
769 /* */
770 /* <Description> */
771 /* A list of decprecated constants. Use the corresponding */
772 /* @QT_FT_Glyph_Format values instead. */
773 /* */
774 /* <Values> */
775 /* qt_ft_glyph_format_none :: see @QT_FT_GLYPH_FORMAT_NONE */
776 /* qt_ft_glyph_format_composite :: see @QT_FT_GLYPH_FORMAT_COMPOSITE */
777 /* qt_ft_glyph_format_bitmap :: see @QT_FT_GLYPH_FORMAT_BITMAP */
778 /* qt_ft_glyph_format_outline :: see @QT_FT_GLYPH_FORMAT_OUTLINE */
779 /* qt_ft_glyph_format_plotter :: see @QT_FT_GLYPH_FORMAT_PLOTTER */
780 /* */
781#define qt_ft_glyph_format_none QT_FT_GLYPH_FORMAT_NONE
782#define qt_ft_glyph_format_composite QT_FT_GLYPH_FORMAT_COMPOSITE
783#define qt_ft_glyph_format_bitmap QT_FT_GLYPH_FORMAT_BITMAP
784#define qt_ft_glyph_format_outline QT_FT_GLYPH_FORMAT_OUTLINE
785#define qt_ft_glyph_format_plotter QT_FT_GLYPH_FORMAT_PLOTTER
786
787
788 /*************************************************************************/
789 /*************************************************************************/
790 /*************************************************************************/
791 /***** *****/
792 /***** R A S T E R D E F I N I T I O N S *****/
793 /***** *****/
794 /*************************************************************************/
795 /*************************************************************************/
796 /*************************************************************************/
797
798
799 /*************************************************************************/
800 /* */
801 /* A raster is a scan converter, in charge of rendering an outline into */
802 /* a a bitmap. This section contains the public API for rasters. */
803 /* */
804 /* Note that in FreeType 2, all rasters are now encapsulated within */
805 /* specific modules called `renderers'. See `freetype/ftrender.h' for */
806 /* more details on renderers. */
807 /* */
808 /*************************************************************************/
809
810
811 /*************************************************************************/
812 /* */
813 /* <Section> */
814 /* raster */
815 /* */
816 /* <Title> */
817 /* Scanline converter */
818 /* */
819 /* <Abstract> */
820 /* How vectorial outlines are converted into bitmaps and pixmaps. */
821 /* */
822 /* <Description> */
823 /* This section contains technical definitions. */
824 /* */
825 /*************************************************************************/
826
827
828 /*************************************************************************/
829 /* */
830 /* <Type> */
831 /* QT_FT_Raster */
832 /* */
833 /* <Description> */
834 /* A handle (pointer) to a raster object. Each object can be used */
835 /* independently to convert an outline into a bitmap or pixmap. */
836 /* */
837 typedef struct TRaster_ *QT_FT_Raster;
838
839
840 /*************************************************************************/
841 /* */
842 /* <Struct> */
843 /* QT_FT_Span */
844 /* */
845 /* <Description> */
846 /* A structure used to model a single span of gray (or black) pixels */
847 /* when rendering a monochrome or anti-aliased bitmap. */
848 /* */
849 /* <Fields> */
850 /* x :: The span's horizontal start position. */
851 /* */
852 /* len :: The span's length in pixels. */
853 /* */
854 /* coverage :: The span color/coverage, ranging from 0 (background) */
855 /* to 255 (foreground). Only used for anti-aliased */
856 /* rendering. */
857 /* */
858 /* <Note> */
859 /* This structure is used by the span drawing callback type named */
860 /* QT_FT_SpanFunc which takes the y-coordinate of the span as a */
861 /* a parameter. */
862 /* */
863 /* The coverage value is always between 0 and 255, even if the number */
864 /* of gray levels have been set through QT_FT_Set_Gray_Levels(). */
865 /* */
866 typedef struct QT_FT_Span_
867 {
868 short x;
869 unsigned short len;
870 short y;
871 unsigned char coverage;
872 } QT_FT_Span;
873
874
875 /*************************************************************************/
876 /* */
877 /* <FuncType> */
878 /* QT_FT_SpanFunc */
879 /* */
880 /* <Description> */
881 /* A function used as a call-back by the anti-aliased renderer in */
882 /* order to let client applications draw themselves the gray pixel */
883 /* spans on each scan line. */
884 /* */
885 /* <Input> */
886 /* y :: The scanline's y-coordinate. */
887 /* */
888 /* count :: The number of spans to draw on this scanline. */
889 /* */
890 /* spans :: A table of `count' spans to draw on the scanline. */
891 /* */
892 /* user :: User-supplied data that is passed to the callback. */
893 /* */
894 /* <Note> */
895 /* This callback allows client applications to directly render the */
896 /* gray spans of the anti-aliased bitmap to any kind of surfaces. */
897 /* */
898 /* This can be used to write anti-aliased outlines directly to a */
899 /* given background bitmap, and even perform translucency. */
900 /* */
901 /* Note that the `count' field cannot be greater than a fixed value */
902 /* defined by the QT_FT_MAX_GRAY_SPANS configuration macro in */
903 /* ftoption.h. By default, this value is set to 32, which means that */
904 /* if there are more than 32 spans on a given scanline, the callback */
905 /* will be called several times with the same `y' parameter in order */
906 /* to draw all callbacks. */
907 /* */
908 /* Otherwise, the callback is only called once per scan-line, and */
909 /* only for those scanlines that do have `gray' pixels on them. */
910 /* */
911 typedef void
912 (*QT_FT_SpanFunc)(int count,
913 const QT_FT_Span* spans,
914 void* worker);
915
916#define QT_FT_Raster_Span_Func QT_FT_SpanFunc
917
918
919 /*************************************************************************/
920 /* */
921 /* <FuncType> */
922 /* QT_FT_Raster_BitTest_Func */
923 /* */
924 /* <Description> */
925 /* THIS TYPE IS DEPRECATED. DO NOT USE IT. */
926 /* */
927 /* A function used as a call-back by the monochrome scan-converter */
928 /* to test whether a given target pixel is already set to the drawing */
929 /* `color'. These tests are crucial to implement drop-out control */
930 /* per-se the TrueType spec. */
931 /* */
932 /* <Input> */
933 /* y :: The pixel's y-coordinate. */
934 /* */
935 /* x :: The pixel's x-coordinate. */
936 /* */
937 /* user :: User-supplied data that is passed to the callback. */
938 /* */
939 /* <Return> */
940 /* 1 if the pixel is `set', 0 otherwise. */
941 /* */
942 typedef int
943 (*QT_FT_Raster_BitTest_Func)( int y,
944 int x,
945 void* user );
946
947
948 /*************************************************************************/
949 /* */
950 /* <FuncType> */
951 /* QT_FT_Raster_BitSet_Func */
952 /* */
953 /* <Description> */
954 /* THIS TYPE IS DEPRECATED. DO NOT USE IT. */
955 /* */
956 /* A function used as a call-back by the monochrome scan-converter */
957 /* to set an individual target pixel. This is crucial to implement */
958 /* drop-out control according to the TrueType specification. */
959 /* */
960 /* <Input> */
961 /* y :: The pixel's y-coordinate. */
962 /* */
963 /* x :: The pixel's x-coordinate. */
964 /* */
965 /* user :: User-supplied data that is passed to the callback. */
966 /* */
967 /* <Return> */
968 /* 1 if the pixel is `set', 0 otherwise. */
969 /* */
970 typedef void
971 (*QT_FT_Raster_BitSet_Func)( int y,
972 int x,
973 void* user );
974
975
976 /*************************************************************************/
977 /* */
978 /* <Enum> */
979 /* QT_FT_RASTER_FLAG_XXX */
980 /* */
981 /* <Description> */
982 /* A list of bit flag constants as used in the `flags' field of a */
983 /* @QT_FT_Raster_Params structure. */
984 /* */
985 /* <Values> */
986 /* QT_FT_RASTER_FLAG_DEFAULT :: This value is 0. */
987 /* */
988 /* QT_FT_RASTER_FLAG_AA :: This flag is set to indicate that an */
989 /* anti-aliased glyph image should be */
990 /* generated. Otherwise, it will be */
991 /* monochrome (1-bit). */
992 /* */
993 /* QT_FT_RASTER_FLAG_DIRECT :: This flag is set to indicate direct */
994 /* rendering. In this mode, client */
995 /* applications must provide their own span */
996 /* callback. This lets them directly */
997 /* draw or compose over an existing bitmap. */
998 /* If this bit is not set, the target */
999 /* pixmap's buffer _must_ be zeroed before */
1000 /* rendering. */
1001 /* */
1002 /* Note that for now, direct rendering is */
1003 /* only possible with anti-aliased glyphs. */
1004 /* */
1005 /* QT_FT_RASTER_FLAG_CLIP :: This flag is only used in direct */
1006 /* rendering mode. If set, the output will */
1007 /* be clipped to a box specified in the */
1008 /* "clip_box" field of the QT_FT_Raster_Params */
1009 /* structure. */
1010 /* */
1011 /* Note that by default, the glyph bitmap */
1012 /* is clipped to the target pixmap, except */
1013 /* in direct rendering mode where all spans */
1014 /* are generated if no clipping box is set. */
1015 /* */
1016#define QT_FT_RASTER_FLAG_DEFAULT 0x0
1017#define QT_FT_RASTER_FLAG_AA 0x1
1018#define QT_FT_RASTER_FLAG_DIRECT 0x2
1019#define QT_FT_RASTER_FLAG_CLIP 0x4
1020
1021 /* deprecated */
1022#define qt_ft_raster_flag_default QT_FT_RASTER_FLAG_DEFAULT
1023#define qt_ft_raster_flag_aa QT_FT_RASTER_FLAG_AA
1024#define qt_ft_raster_flag_direct QT_FT_RASTER_FLAG_DIRECT
1025#define qt_ft_raster_flag_clip QT_FT_RASTER_FLAG_CLIP
1026
1027
1028 /*************************************************************************/
1029 /* */
1030 /* <Struct> */
1031 /* QT_FT_Raster_Params */
1032 /* */
1033 /* <Description> */
1034 /* A structure to hold the arguments used by a raster's render */
1035 /* function. */
1036 /* */
1037 /* <Fields> */
1038 /* target :: The target bitmap. */
1039 /* */
1040 /* source :: A pointer to the source glyph image (e.g. an */
1041 /* QT_FT_Outline). */
1042 /* */
1043 /* flags :: The rendering flags. */
1044 /* */
1045 /* gray_spans :: The gray span drawing callback. */
1046 /* */
1047 /* black_spans :: The black span drawing callback. */
1048 /* */
1049 /* bit_test :: The bit test callback. UNIMPLEMENTED! */
1050 /* */
1051 /* bit_set :: The bit set callback. UNIMPLEMENTED! */
1052 /* */
1053 /* user :: User-supplied data that is passed to each drawing */
1054 /* callback. */
1055 /* */
1056 /* clip_box :: An optional clipping box. It is only used in */
1057 /* direct rendering mode. Note that coordinates here */
1058 /* should be expressed in _integer_ pixels (and not in */
1059 /* 26.6 fixed-point units). */
1060 /* */
1061 /* <Note> */
1062 /* An anti-aliased glyph bitmap is drawn if the QT_FT_RASTER_FLAG_AA bit */
1063 /* flag is set in the `flags' field, otherwise a monochrome bitmap */
1064 /* will be generated. */
1065 /* */
1066 /* If the QT_FT_RASTER_FLAG_DIRECT bit flag is set in `flags', the */
1067 /* raster will call the `gray_spans' callback to draw gray pixel */
1068 /* spans, in the case of an aa glyph bitmap, it will call */
1069 /* `black_spans', and `bit_test' and `bit_set' in the case of a */
1070 /* monochrome bitmap. This allows direct composition over a */
1071 /* pre-existing bitmap through user-provided callbacks to perform the */
1072 /* span drawing/composition. */
1073 /* */
1074 /* Note that the `bit_test' and `bit_set' callbacks are required when */
1075 /* rendering a monochrome bitmap, as they are crucial to implement */
1076 /* correct drop-out control as defined in the TrueType specification. */
1077 /* */
1078 typedef struct QT_FT_Raster_Params_
1079 {
1080 QT_FT_Bitmap* target;
1081 void* source;
1082 int flags;
1083 QT_FT_SpanFunc gray_spans;
1084 QT_FT_SpanFunc black_spans;
1085 QT_FT_Raster_BitTest_Func bit_test; /* doesn't work! */
1086 QT_FT_Raster_BitSet_Func bit_set; /* doesn't work! */
1087 void* user;
1088 QT_FT_BBox clip_box;
1089 int skip_spans;
1090
1091 } QT_FT_Raster_Params;
1092
1093
1094 /*************************************************************************/
1095 /* */
1096 /* <FuncType> */
1097 /* QT_FT_Raster_NewFunc */
1098 /* */
1099 /* <Description> */
1100 /* A function used to create a new raster object. */
1101 /* */
1102 /* <Input> */
1103 /* memory :: A handle to the memory allocator. */
1104 /* */
1105 /* <Output> */
1106 /* raster :: A handle to the new raster object. */
1107 /* */
1108 /* <Return> */
1109 /* Error code. 0 means success. */
1110 /* */
1111 /* <Note> */
1112 /* The `memory' parameter is a typeless pointer in order to avoid */
1113 /* un-wanted dependencies on the rest of the FreeType code. In */
1114 /* practice, it is a QT_FT_Memory, i.e., a handle to the standard */
1115 /* FreeType memory allocator. However, this field can be completely */
1116 /* ignored by a given raster implementation. */
1117 /* */
1118 typedef int
1119 (*QT_FT_Raster_NewFunc)( QT_FT_Raster* raster );
1120
1121#define QT_FT_Raster_New_Func QT_FT_Raster_NewFunc
1122
1123 /*************************************************************************/
1124 /* */
1125 /* <FuncType> */
1126 /* QT_FT_Raster_DoneFunc */
1127 /* */
1128 /* <Description> */
1129 /* A function used to destroy a given raster object. */
1130 /* */
1131 /* <Input> */
1132 /* raster :: A handle to the raster object. */
1133 /* */
1134 typedef void
1135 (*QT_FT_Raster_DoneFunc)( QT_FT_Raster raster );
1136
1137#define QT_FT_Raster_Done_Func QT_FT_Raster_DoneFunc
1138
1139 /*************************************************************************/
1140 /* */
1141 /* <FuncType> */
1142 /* QT_FT_Raster_ResetFunc */
1143 /* */
1144 /* <Description> */
1145 /* FreeType provides an area of memory called the `render pool', */
1146 /* available to all registered rasters. This pool can be freely used */
1147 /* during a given scan-conversion but is shared by all rasters. Its */
1148 /* content is thus transient. */
1149 /* */
1150 /* This function is called each time the render pool changes, or just */
1151 /* after a new raster object is created. */
1152 /* */
1153 /* <Input> */
1154 /* raster :: A handle to the new raster object. */
1155 /* */
1156 /* pool_base :: The address in memory of the render pool. */
1157 /* */
1158 /* pool_size :: The size in bytes of the render pool. */
1159 /* */
1160 /* <Note> */
1161 /* Rasters can ignore the render pool and rely on dynamic memory */
1162 /* allocation if they want to (a handle to the memory allocator is */
1163 /* passed to the raster constructor). However, this is not */
1164 /* recommended for efficiency purposes. */
1165 /* */
1166 typedef void
1167 (*QT_FT_Raster_ResetFunc)( QT_FT_Raster raster,
1168 unsigned char* pool_base,
1169 unsigned long pool_size );
1170
1171#define QT_FT_Raster_Reset_Func QT_FT_Raster_ResetFunc
1172
1173 /*************************************************************************/
1174 /* */
1175 /* <FuncType> */
1176 /* QT_FT_Raster_SetModeFunc */
1177 /* */
1178 /* <Description> */
1179 /* This function is a generic facility to change modes or attributes */
1180 /* in a given raster. This can be used for debugging purposes, or */
1181 /* simply to allow implementation-specific `features' in a given */
1182 /* raster module. */
1183 /* */
1184 /* <Input> */
1185 /* raster :: A handle to the new raster object. */
1186 /* */
1187 /* mode :: A 4-byte tag used to name the mode or property. */
1188 /* */
1189 /* args :: A pointer to the new mode/property to use. */
1190 /* */
1191 typedef int
1192 (*QT_FT_Raster_SetModeFunc)( QT_FT_Raster raster,
1193 unsigned long mode,
1194 void* args );
1195
1196#define QT_FT_Raster_Set_Mode_Func QT_FT_Raster_SetModeFunc
1197
1198 /*************************************************************************/
1199 /* */
1200 /* <FuncType> */
1201 /* QT_FT_Raster_RenderFunc */
1202 /* */
1203 /* <Description> */
1204 /* Invokes a given raster to scan-convert a given glyph image into a */
1205 /* target bitmap. */
1206 /* */
1207 /* <Input> */
1208 /* raster :: A handle to the raster object. */
1209 /* */
1210 /* params :: A pointer to a QT_FT_Raster_Params structure used to store */
1211 /* the rendering parameters. */
1212 /* */
1213 /* <Return> */
1214 /* Error code. 0 means success. */
1215 /* */
1216 /* <Note> */
1217 /* The exact format of the source image depends on the raster's glyph */
1218 /* format defined in its QT_FT_Raster_Funcs structure. It can be an */
1219 /* QT_FT_Outline or anything else in order to support a large array of */
1220 /* glyph formats. */
1221 /* */
1222 /* Note also that the render function can fail and return a */
1223 /* QT_FT_Err_Unimplemented_Feature error code if the raster used does */
1224 /* not support direct composition. */
1225 /* */
1226 /* XXX: For now, the standard raster doesn't support direct */
1227 /* composition but this should change for the final release (see */
1228 /* the files demos/src/ftgrays.c and demos/src/ftgrays2.c for */
1229 /* examples of distinct implementations which support direct */
1230 /* composition). */
1231 /* */
1232 typedef int
1233 (*QT_FT_Raster_RenderFunc)( QT_FT_Raster raster,
1234 QT_FT_Raster_Params* params );
1235
1236#define QT_FT_Raster_Render_Func QT_FT_Raster_RenderFunc
1237
1238 /*************************************************************************/
1239 /* */
1240 /* <Struct> */
1241 /* QT_FT_Raster_Funcs */
1242 /* */
1243 /* <Description> */
1244 /* A structure used to describe a given raster class to the library. */
1245 /* */
1246 /* <Fields> */
1247 /* glyph_format :: The supported glyph format for this raster. */
1248 /* */
1249 /* raster_new :: The raster constructor. */
1250 /* */
1251 /* raster_reset :: Used to reset the render pool within the raster. */
1252 /* */
1253 /* raster_render :: A function to render a glyph into a given bitmap. */
1254 /* */
1255 /* raster_done :: The raster destructor. */
1256 /* */
1257 typedef struct QT_FT_Raster_Funcs_
1258 {
1259 QT_FT_Glyph_Format glyph_format;
1260 QT_FT_Raster_NewFunc raster_new;
1261 QT_FT_Raster_ResetFunc raster_reset;
1262 QT_FT_Raster_SetModeFunc raster_set_mode;
1263 QT_FT_Raster_RenderFunc raster_render;
1264 QT_FT_Raster_DoneFunc raster_done;
1265
1266 } QT_FT_Raster_Funcs;
1267
1268
1269 /* */
1270
1271
1272QT_FT_END_HEADER
1273
1274#endif /* __FTIMAGE_H__ */
1275
1276
1277/* END */
1278