1 | /****************************************************************************
|
---|
2 | **
|
---|
3 | ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
|
---|
4 | ** All rights reserved.
|
---|
5 | ** Contact: Nokia Corporation (qt-info@nokia.com)
|
---|
6 | **
|
---|
7 | ** This file is part of the QtGui module of the Qt Toolkit.
|
---|
8 | **
|
---|
9 | ** $QT_BEGIN_LICENSE:LGPL$
|
---|
10 | ** Commercial Usage
|
---|
11 | ** Licensees holding valid Qt Commercial licenses may use this file in
|
---|
12 | ** accordance with the Qt Commercial License Agreement provided with the
|
---|
13 | ** Software or, alternatively, in accordance with the terms contained in
|
---|
14 | ** a written agreement between you and Nokia.
|
---|
15 | **
|
---|
16 | ** GNU Lesser General Public License Usage
|
---|
17 | ** Alternatively, this file may be used under the terms of the GNU Lesser
|
---|
18 | ** General Public License version 2.1 as published by the Free Software
|
---|
19 | ** Foundation and appearing in the file LICENSE.LGPL included in the
|
---|
20 | ** packaging of this file. Please review the following information to
|
---|
21 | ** ensure the GNU Lesser General Public License version 2.1 requirements
|
---|
22 | ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
|
---|
23 | **
|
---|
24 | ** In addition, as a special exception, Nokia gives you certain additional
|
---|
25 | ** rights. These rights are described in the Nokia Qt LGPL Exception
|
---|
26 | ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
|
---|
27 | **
|
---|
28 | ** GNU General Public License Usage
|
---|
29 | ** Alternatively, this file may be used under the terms of the GNU
|
---|
30 | ** General Public License version 3.0 as published by the Free Software
|
---|
31 | ** Foundation and appearing in the file LICENSE.GPL included in the
|
---|
32 | ** packaging of this file. Please review the following information to
|
---|
33 | ** ensure the GNU General Public License version 3.0 requirements will be
|
---|
34 | ** met: http://www.gnu.org/copyleft/gpl.html.
|
---|
35 | **
|
---|
36 | ** If you have questions regarding the use of this file, please contact
|
---|
37 | ** Nokia at qt-info@nokia.com.
|
---|
38 | ** $QT_END_LICENSE$
|
---|
39 | **
|
---|
40 | ****************************************************************************/
|
---|
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 */
|
---|