summaryrefslogtreecommitdiff
path: root/src/lib/eina/eina_tiler.h
blob: c6dd492d2f4afc1701ed90deeff2991b43e577fb (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
/* EINA - EFL data type library
 * Copyright (C) 2007-2008 Jorge Luis Zapata Muga
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library;
 * if not, see <http://www.gnu.org/licenses/>.
 */

#ifndef EINA_TILER_H_
#define EINA_TILER_H_

#include "eina_types.h"
#include "eina_iterator.h"
#include "eina_rectangle.h"

/**
 * @page eina_tiler_example_01
 * @dontinclude eina_tiler_01.c
 *
 * This is an example that illustrates how Eina_Tiler works for a given set of
 * rectangles. The rectangles must be given in the command line in the form:
 * \<width\>x\<height\>+\<x offset\>+\<y offset\>
 * The example will show two panels, the first(input) will show the given
 * rectangles(in different colors) and in the seconds(output) it will show the
 * rectangles given by the tiler. The rectangles will be added one by one every
 * two seconds. A lot of the example deals with actually painting the rectangles
 * so we'll skip over quite a bit of code, but you can see all of it in @ref
 * eina_tiler_01.c "eina_tiler_01.c".
 *
 * The first thing of note in our example is the creation of the tiler:
 * @skipline eina_tiler_new
 * @note @p maxw and @p maxh are calculated such that the tiler's size will
 * fully encompass all given rectangles.
 *
 * We'll now look at the function that actually adds rectangles to our tiler. It
 * first checks if we added all rectangles already and if so stops right there:
 * @dontinclude eina_tiler_01.c
 * @skip static Eina_Bool
 * @until }
 *
 * Our function then clears all rectangles given to us by tiler from the last
 * execution. It does this because each rectangle we add may change everything
 * about the output of eina_tiler:
 * @until output_rects_reset
 *
 * Next we get another rectangle, print it and show it in the input panel:
 * @until add_input_rect
 *
 * We now come to the tiler stuff, we add our new rectangle to it and get a new
 * iterator for the tiler:
 * @until itr
 *
 * We now iterate over our tiler printing every rect it gives us and sowing it
 * in the output panel:
 * @until }
 *
 * We of course must remember to free our iterator and that's it for this
 * function:
 * @until }
 *
 * You should try many different inputs to see how the tiler works, here are a
 * few suggestions:
 * @li 100x100+0+0 100x100+200+200
 * @li 100x100+0+0 100x100+5+5 100x100+10+10 100x100+15+15 100x100+20+20
 * @li 100x100+0+0 100x100+100+100 100x100+200+0 100x100+0+200 100x100+200+200
 * @li 10x10+0+0 10x10+10+10 10x10+20+0 10x10+0+20 10x10+20+20
 *
 * @example eina_tiler_01.c
 */
/**
 * @addtogroup Eina_Data_Types_Group Data Types
 *
 * @{
 */

/**
 * @defgroup Eina_Tiler_Group Tiler
 *
 * @warning This is a very low level tool, in most situations (for example if
 * you're using evas) you won't need this.
 *
 * @section basic Basic usage
 *
 * Eina_Tiler is a tool to facilitate calculations of which areas are damaged
 * and thus need to be re-rendered. The basic usage of Eina_Tiler is to give it
 * the size of your canvas and a set of rectangular areas that need
 * re-rendering, from that and using heuristics it'll tell you an efficient way
 * to re-render in the form of a set of non-overlapping rectangles that covers
 * the whole area that needs re-rendering.
 *
 * The following is pseudo-code showing some simple use of Eina_Tiler:
 * @code
 * tiler = eina_tiler_new(MY_CANVAS_WIDTH, MY_CANVAS_HEIGHT);
 * EINA_LIST_FOREACH(list_of_areas_that_need_re_rendering, l, rect)
 *   eina_tiler_add(tiler, rect);
 * itr = eina_tiler_iterator_new(tiler);
 * EINA_ITERATOR_FOREACH(itr, rect)
 *   my_function_that_repaints_areas_of_the_canvas(rect);
 * @endcode
 *
 * @see eina_tiler_new()
 * @see eina_tiler_rect_add()
 * @see eina_tiler_iterator_new()
 *
 * @warning There are no guarantees that this will be the most efficient way to
 * re-render for any particular case.
 *
 * @section grid_slicer Grid Slicer
 *
 * Grid slicer and Eina_Tiler are usually used together, that is however @b not
 * necessary, they can be used independently. Grid slicer provides an easy API
 * to divide an area in tiles which is useful in certain applications to divide
 * the area that will be rendered into tiles. It's customary to, then create one
 * Eina_Tiler for each tile.
 *
 * The following is pseudo-code showing a very simplified use of grid slicer
 * together with Eina_Tiler:
 * @code
 * itr = eina_tile_grid_slicer_iterator_new(0, 0, MY_CANVAS_WIDTH, MY_CANVAS_HEIGHT, TILE_WIDTH, TILE_HEIGHT);
 * EINA_ITERATOR_FOREACH(itr, grid_info)
 *   {
 *      tiler = eina_tiler_new(grid_info->rect.w, grid_info->rect.w);
 *      EINA_LIST_FOREACH(list_of_areas_that_need_re_rendering_in_this_tile, l, rect)
 *        eina_tiler_add(tiler, rect);
 *      itr = eina_tiler_iterator_new(tiler);
 *      EINA_ITERATOR_FOREACH(itr, rect)
 *      my_function_that_repaints_areas_of_the_canvas(rect);
 *   }
 * @endcode
 *
 * @see eina_tiler_new()
 * @see eina_tiler_rect_add()
 * @see eina_tile_grid_slicer_setup()
 * @see eina_tile_grid_slicer_next()
 * @see eina_tile_grid_slicer_iterator_new()
 *
 * @{
 */

/**
 * @typedef Eina_Tiler
 * Tiler type.
 */
typedef struct _Eina_Tiler Eina_Tiler;

/**
 * @typedef Eina_Tile_Grid_Info
 * Grid type of a tiler.
 */
typedef struct Eina_Tile_Grid_Info Eina_Tile_Grid_Info;

/**
 * @struct Eina_Tile_Grid_Info
 * Grid type of a tiler.
 */
struct Eina_Tile_Grid_Info
{
   unsigned long  col; /**< column of the tile grid */
   unsigned long  row; /**< row of the tile grid*/
   Eina_Rectangle rect; /**< rectangle of the tile grid, coordinates are
                             relative to tile*/
   Eina_Bool      full; /**< whether the grid is full or not */
};

typedef struct _Eina_Tile_Grid_Slicer Eina_Tile_Grid_Slicer;

/**
 * @brief Creates a new tiler with @p w width and @p h height.
 *
 * @param w Width of the tiler
 * @param h Height of the tiler
 * @return The newly created tiler
 *
 * @see eina_tiler_free()
 */
EAPI Eina_Tiler        *eina_tiler_new(int w, int h);

/**
 * @brief Frees a tiler.
 *
 * @param t The tiler to free.
 *
 * This function frees @p t. It does not free the memory allocated for the
 * elements of @p t.
 */
EAPI void               eina_tiler_free(Eina_Tiler *t);

/**
 * @brief Sets the size of tiles for a tiler.
 *
 * @param t The tiler whose tile size will be set.
 * @param w Width of the tiles.
 * @param h Height of the tiles.
 *
 * @warning @p w and @p h @b must be greater than zero, otherwise tile size
 * won't be changed.
 * @warning Tile size is not used!
 */
EAPI void               eina_tiler_tile_size_set(Eina_Tiler *t, int w, int h);

/**
 * @brief Changes the size of the area covered by the tiler.
 *
 * @param t The tiler whose area size will be set.
 * @param w Width of the area.
 * @param h Height of the area.
 *
 * @since 1.8
 *
 * @warning Must clear the tiler before changing its size.
 */
EAPI void               eina_tiler_area_size_set(Eina_Tiler *t, int w, int h);

/**
 * @brief Gets the size of the area covered by the tiler.
 *
 * @param t The tiler whose area size will be fetched.
 * @param w Width of the area.
 * @param h Height of the area.
 *
 * @since 1.8
 */
EAPI void               eina_tiler_area_size_get(const Eina_Tiler *t, int *w, int *h);

/**
 * @brief Defines if we need to follow a strict grid of tile or a loose one.
 *
 * @param t The tiler to apply the strict rules to.
 * @param strict Define if it will be strict or loose
 *
 * By default it will be loose.
 *
 * @since 1.8
 */
EAPI void               eina_tiler_strict_set(Eina_Tiler *t, Eina_Bool strict);

/**
 * @brief Tells if a tiler is empty or not.
 *
 * @param t The tiler to apply the strict rules to.
 * @return #EINA_TRUE when empty, #EINA_FALSE when not.
 *
 * @since 1.8
 */
EAPI Eina_Bool          eina_tiler_empty(const Eina_Tiler *t);

/**
 * @brief Adds a rectangle to a tiler.
 *
 * @param t The tiler in which to add a container.
 * @param r The rectangle to be added.
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * @see eina_tiler_rect_del()
 */
EAPI Eina_Bool          eina_tiler_rect_add(Eina_Tiler *t, const Eina_Rectangle *r);

/**
 * @brief Removes a rectangle from a tiler.
 *
 * @param t The tiler in which to add a container.
 * @param r The rectangle to be removed.
 *
 * @see eina_tiler_rect_add()
 * @see eina_tiler_clear()
 */
EAPI void               eina_tiler_rect_del(Eina_Tiler *t, const Eina_Rectangle *r);

/**
 * @brief Removes all rectangles from tiles.
 *
 * @param t The tiler to clear.
 *
 * @see eina_tiler_rect_del()
 */
EAPI void               eina_tiler_clear(Eina_Tiler *t);

/**
 * @brief Creates a iterator to access the tilers calculated rectangles.
 *
 * @param t The tiler to iterate over.
 * @return A iterator containing Eina_Rectangle.
 */
EAPI Eina_Iterator     *eina_tiler_iterator_new(const Eina_Tiler *t);

/**
 * @brief Creates a new Eina_Iterator that iterates over a list of tiles.
 *
 * @param   x X axis coordinate.
 * @param   y Y axis coordinate.
 * @param   w Width.
 * @param   h Height.
 * @param   tile_w Tile width.
 * @param   tile_h Tile height.
 * @return  A pointer to the Eina_Iterator. @c NULL on failure.
 *
 * The region defined by @a x, @a y, @a w, @a h will be divided in to a grid of
 * tiles of width @a tile_w and height @p tile_h, the returned iterator will
 * iterate over every tile in the grid having as its data a #Eina_Tile_Grid_Info.
 *
 * @note This is a convenience function, iterating over the returned iterator is
 * equivalent to calling eina_tile_grid_slicer_setup() and calling
 * eina_tile_grid_slicer_next() until it returns #EINA_FALSE.
 */
EAPI Eina_Iterator     *eina_tile_grid_slicer_iterator_new(int x, int y, int w, int h, int tile_w, int tile_h);

/**
 * @brief Gets the union of two tilers.
 *
 * @param   dst The first tiler, will store the result.
 * @param   src The second tiler.
 * @return  #EINA_TRUE on success, #EINA_FALSE otherwise.
 *
 * This function gets the union of tilers @p dst and @p src.
 * The result is stored in @p dst. It returns #EINA_TRUE if it succeeds.
 * @since 1.11
 */
EAPI Eina_Bool          eina_tiler_union(Eina_Tiler *dst, Eina_Tiler *src);

/**
 * @brief Subtracts two tilers.
 *
 * @param   dst The first tiler, will store the result.
 * @param   src The second tiler.
 * @return  #EINA_TRUE on success, #EINA_FALSE otherwise.
 *
 * This function subtracts two tilers @p dst and @p src.
 * The result is stored in @p dst. It returns #EINA_TRUE if it succeeds.
 * @since 1.11
 */
EAPI Eina_Bool          eina_tiler_subtract(Eina_Tiler *dst, Eina_Tiler *src);

/**
 * @brief Gets the intersection of two tilers.
 *
 * @param   t1 The first tile.
 * @param   t2 The second tiler.
 * @return  A pointer of intersection result. @c NULL if intersection doesn't exist.
 *
 * This function gets the intersection of two tilers @p t1 and @p t2.
 * It returns a pointer of result if intersection of two tilers exists., otherwise returns NULL.
 * @since 1.11
 */
EAPI Eina_Tiler        *eina_tiler_intersection(Eina_Tiler *t1, Eina_Tiler *t2);

/**
 * @brief Gets whether two tilers are equal in rects or not.
 *
 * @param   t1 The first tiler.
 * @param   t2 The second tiler.
 * @return  #EINA_TRUE if equal, #EINA_FALSE if unequal.
 *
 * This function gets result of comparison for @p t1 and @p t2.
 * It returns #EINA_TRUE if tilers are equal.
 * @since 1.11
 */
EAPI Eina_Bool           eina_tiler_equal(const Eina_Tiler *t1, const Eina_Tiler *t2);

/**
 * @brief Iterates over the tiles set by eina_tile_grid_slicer_setup().
 *
 * @param   slc Pointer to an Eina_Tile_Grid_Slicer struct.
 * @param   rect Pointer to a struct Eina_Tile_Grid_Info *.
 * @return  #EINA_TRUE if the current rect is valid. #EINA_FALSE if there
 * are no more rects to iterate over (and thus the current one isn't valid).
 *
 * This functions iterates over each Eina_Tile_Grid_Info *rect of the grid.
 * eina_tile_grid_slicer_setup() must be called first, and *rect is only valid
 * if this function returns #EINA_TRUE. Its content shouldn't be modified.
 *
 * @note Consider using eina_tile_grid_slicer_iterator_new() instead.
 */
static inline Eina_Bool eina_tile_grid_slicer_next(Eina_Tile_Grid_Slicer *slc, const Eina_Tile_Grid_Info **rect);

/**
 * @brief Sets up an Eina_Tile_Grid_Slicer struct.
 *
 * @param   slc Pointer to an Eina_Tile_Grid_Slicer struct.
 * @param   x X axis coordinate.
 * @param   y Y axis coordinate.
 * @param   w Width.
 * @param   h Height.
 * @param   tile_w Tile width.
 * @param   tile_h Tile height.
 * @return  A pointer to the Eina_Iterator, @c NULL on failure.
 *
 * The region defined by @a x, @a y, @a w, @a h will be divided into a grid of
 * tiles of width @a tile_w and height @p tile_h, @p slc can then be used with
 * eina_tile_grid_slicer_next() to access each tile.
 *
 * @note Consider using eina_tile_grid_slicer_iterator_new() instead.
 */
static inline Eina_Bool eina_tile_grid_slicer_setup(Eina_Tile_Grid_Slicer *slc, int x, int y, int w, int h, int tile_w, int tile_h);

#include "eina_inline_tiler.x"

/**
 * @}
 */

/**
 * @}
 */

#endif /* EINA_TILER_H_ */