/
lv_img_buf.c
606 lines (522 loc) · 21.9 KB
/
lv_img_buf.c
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
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
/**
* @file lv_img_buf.c
*
*/
/*********************
* INCLUDES
*********************/
#include <stddef.h>
#include <string.h>
#include "lv_img_buf.h"
#include "lv_draw_img.h"
#include "../lv_misc/lv_math.h"
#include "../lv_misc/lv_log.h"
#include "../lv_misc/lv_mem.h"
/*********************
* DEFINES
*********************/
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
static inline bool transform_anti_alias(lv_img_transform_dsc_t * dsc);
/**********************
* STATIC VARIABLES
**********************/
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
/**
* Get the color of an image's pixel
* @param dsc an image descriptor
* @param x x coordinate of the point to get
* @param y x coordinate of the point to get
* @param color the color of the image. In case of `LV_IMG_CF_ALPHA_1/2/4/8` this color is used.
* Not used in other cases.
* @param safe true: check out of bounds
* @return color of the point
*/
lv_color_t lv_img_buf_get_px_color(lv_img_dsc_t * dsc, lv_coord_t x, lv_coord_t y, lv_color_t color)
{
lv_color_t p_color = LV_COLOR_BLACK;
uint8_t * buf_u8 = (uint8_t *)dsc->data;
if(dsc->header.cf == LV_IMG_CF_TRUE_COLOR || dsc->header.cf == LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED ||
dsc->header.cf == LV_IMG_CF_TRUE_COLOR_ALPHA) {
uint8_t px_size = lv_img_cf_get_px_size(dsc->header.cf) >> 3;
uint32_t px = dsc->header.w * y * px_size + x * px_size;
memcpy(&p_color, &buf_u8[px], sizeof(lv_color_t));
#if LV_COLOR_SIZE == 32
p_color.ch.alpha = 0xFF; /*Only the color should be get so use a deafult alpha value*/
#endif
} else if(dsc->header.cf == LV_IMG_CF_INDEXED_1BIT) {
buf_u8 += 4 * 2;
uint8_t bit = x & 0x7;
x = x >> 3;
/* Get the current pixel.
* dsc->header.w + 7 means rounding up to 8 because the lines are byte aligned
* so the possible real width are 8, 16, 24 ...*/
uint32_t px = ((dsc->header.w + 7) >> 3) * y + x;
p_color.full = (buf_u8[px] & (1 << (7 - bit))) >> (7 - bit);
} else if(dsc->header.cf == LV_IMG_CF_INDEXED_2BIT) {
buf_u8 += 4 * 4;
uint8_t bit = (x & 0x3) * 2;
x = x >> 2;
/* Get the current pixel.
* dsc->header.w + 3 means rounding up to 4 because the lines are byte aligned
* so the possible real width are 4, 8, 12 ...*/
uint32_t px = ((dsc->header.w + 3) >> 2) * y + x;
p_color.full = (buf_u8[px] & (3 << (6 - bit))) >> (6 - bit);
} else if(dsc->header.cf == LV_IMG_CF_INDEXED_4BIT) {
buf_u8 += 4 * 16;
uint8_t bit = (x & 0x1) * 4;
x = x >> 1;
/* Get the current pixel.
* dsc->header.w + 1 means rounding up to 2 because the lines are byte aligned
* so the possible real width are 2, 4, 6 ...*/
uint32_t px = ((dsc->header.w + 1) >> 1) * y + x;
p_color.full = (buf_u8[px] & (0xF << (4 - bit))) >> (4 - bit);
} else if(dsc->header.cf == LV_IMG_CF_INDEXED_8BIT) {
buf_u8 += 4 * 256;
uint32_t px = dsc->header.w * y + x;
p_color.full = buf_u8[px];
} else if(dsc->header.cf == LV_IMG_CF_ALPHA_1BIT || dsc->header.cf == LV_IMG_CF_ALPHA_2BIT ||
dsc->header.cf == LV_IMG_CF_ALPHA_4BIT || dsc->header.cf == LV_IMG_CF_ALPHA_8BIT) {
p_color = color;
}
return p_color;
}
/**
* Get the alpha value of an image's pixel
* @param dsc pointer to an image descriptor
* @param x x coordinate of the point to set
* @param y x coordinate of the point to set
* @param safe true: check out of bounds
* @return alpha value of the point
*/
lv_opa_t lv_img_buf_get_px_alpha(lv_img_dsc_t * dsc, lv_coord_t x, lv_coord_t y)
{
uint8_t * buf_u8 = (uint8_t *)dsc->data;
if(dsc->header.cf == LV_IMG_CF_TRUE_COLOR_ALPHA) {
uint32_t px = dsc->header.w * y * LV_IMG_PX_SIZE_ALPHA_BYTE + x * LV_IMG_PX_SIZE_ALPHA_BYTE;
return buf_u8[px + LV_IMG_PX_SIZE_ALPHA_BYTE - 1];
} else if(dsc->header.cf == LV_IMG_CF_ALPHA_1BIT) {
uint8_t bit = x & 0x7;
x = x >> 3;
/* Get the current pixel.
* dsc->header.w + 7 means rounding up to 8 because the lines are byte aligned
* so the possible real width are 8 ,16, 24 ...*/
uint32_t px = ((dsc->header.w + 7) >> 3) * y + x;
uint8_t px_opa = (buf_u8[px] & (1 << (7 - bit))) >> (7 - bit);
return px_opa ? LV_OPA_TRANSP : LV_OPA_COVER;
} else if(dsc->header.cf == LV_IMG_CF_ALPHA_2BIT) {
const uint8_t opa_table[4] = {0, 85, 170, 255}; /*Opacity mapping with bpp = 2*/
uint8_t bit = (x & 0x3) * 2;
x = x >> 2;
/* Get the current pixel.
* dsc->header.w + 4 means rounding up to 8 because the lines are byte aligned
* so the possible real width are 4 ,8, 12 ...*/
uint32_t px = ((dsc->header.w + 3) >> 2) * y + x;
uint8_t px_opa = (buf_u8[px] & (3 << (6 - bit))) >> (6 - bit);
return opa_table[px_opa];
} else if(dsc->header.cf == LV_IMG_CF_ALPHA_4BIT) {
const uint8_t opa_table[16] = {0, 17, 34, 51, /*Opacity mapping with bpp = 4*/
68, 85, 102, 119, 136, 153, 170, 187, 204, 221, 238, 255};
uint8_t bit = (x & 0x1) * 4;
x = x >> 1;
/* Get the current pixel.
* dsc->header.w + 1 means rounding up to 8 because the lines are byte aligned
* so the possible real width are 2 ,4, 6 ...*/
uint32_t px = ((dsc->header.w + 1) >> 1) * y + x;
uint8_t px_opa = (buf_u8[px] & (0xF << (4 - bit))) >> (4 - bit);
return opa_table[px_opa];
} else if(dsc->header.cf == LV_IMG_CF_ALPHA_8BIT) {
uint32_t px = dsc->header.w * y + x;
return buf_u8[px];
}
return LV_OPA_COVER;
}
/**
* Set the alpha value of a pixel of an image. The color won't be affected
* @param dsc pointer to an image descriptor
* @param x x coordinate of the point to set
* @param y x coordinate of the point to set
* @param opa the desired opacity
* @param safe true: check out of bounds
*/
void lv_img_buf_set_px_alpha(lv_img_dsc_t * dsc, lv_coord_t x, lv_coord_t y, lv_opa_t opa)
{
uint8_t * buf_u8 = (uint8_t *)dsc->data;
if(dsc->header.cf == LV_IMG_CF_TRUE_COLOR_ALPHA) {
uint8_t px_size = lv_img_cf_get_px_size(dsc->header.cf) >> 3;
uint32_t px = dsc->header.w * y * px_size + x * px_size;
buf_u8[px + px_size - 1] = opa;
} else if(dsc->header.cf == LV_IMG_CF_ALPHA_1BIT) {
opa = opa >> 7; /*opa -> [0,1]*/
uint8_t bit = x & 0x7;
x = x >> 3;
/* Get the current pixel.
* dsc->header.w + 7 means rounding up to 8 because the lines are byte aligned
* so the possible real width are 8 ,16, 24 ...*/
uint32_t px = ((dsc->header.w + 7) >> 3) * y + x;
buf_u8[px] = buf_u8[px] & ~(1 << (7 - bit));
buf_u8[px] = buf_u8[px] | ((opa & 0x1) << (7 - bit));
} else if(dsc->header.cf == LV_IMG_CF_ALPHA_2BIT) {
opa = opa >> 6; /*opa -> [0,3]*/
uint8_t bit = (x & 0x3) * 2;
x = x >> 2;
/* Get the current pixel.
* dsc->header.w + 4 means rounding up to 8 because the lines are byte aligned
* so the possible real width are 4 ,8, 12 ...*/
uint32_t px = ((dsc->header.w + 3) >> 2) * y + x;
buf_u8[px] = buf_u8[px] & ~(3 << (6 - bit));
buf_u8[px] = buf_u8[px] | ((opa & 0x3) << (6 - bit));
} else if(dsc->header.cf == LV_IMG_CF_ALPHA_4BIT) {
opa = opa >> 4; /*opa -> [0,15]*/
uint8_t bit = (x & 0x1) * 4;
x = x >> 1;
/* Get the current pixel.
* dsc->header.w + 1 means rounding up to 8 because the lines are byte aligned
* so the possible real width are 2 ,4, 6 ...*/
uint32_t px = ((dsc->header.w + 1) >> 1) * y + x;
buf_u8[px] = buf_u8[px] & ~(0xF << (4 - bit));
buf_u8[px] = buf_u8[px] | ((opa & 0xF) << (4 - bit));
} else if(dsc->header.cf == LV_IMG_CF_ALPHA_8BIT) {
uint32_t px = dsc->header.w * y + x;
buf_u8[px] = opa;
}
}
/**
* Set the color of a pixel of an image. The alpha channel won't be affected.
* @param dsc pointer to an image descriptor
* @param x x coordinate of the point to set
* @param y x coordinate of the point to set
* @param c color of the point
* @param safe true: check out of bounds
*/
void lv_img_buf_set_px_color(lv_img_dsc_t * dsc, lv_coord_t x, lv_coord_t y, lv_color_t c)
{
uint8_t * buf_u8 = (uint8_t *)dsc->data;
if(dsc->header.cf == LV_IMG_CF_TRUE_COLOR || dsc->header.cf == LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED) {
uint8_t px_size = lv_img_cf_get_px_size(dsc->header.cf) >> 3;
uint32_t px = dsc->header.w * y * px_size + x * px_size;
memcpy(&buf_u8[px], &c, px_size);
} else if(dsc->header.cf == LV_IMG_CF_TRUE_COLOR_ALPHA) {
uint8_t px_size = lv_img_cf_get_px_size(dsc->header.cf) >> 3;
uint32_t px = dsc->header.w * y * px_size + x * px_size;
memcpy(&buf_u8[px], &c, px_size - 1); /*-1 to not overwrite the alpha value*/
} else if(dsc->header.cf == LV_IMG_CF_INDEXED_1BIT) {
buf_u8 += sizeof(lv_color32_t) * 2; /*Skip the palette*/
uint8_t bit = x & 0x7;
x = x >> 3;
/* Get the current pixel.
* dsc->header.w + 7 means rounding up to 8 because the lines are byte aligned
* so the possible real width are 8 ,16, 24 ...*/
uint32_t px = ((dsc->header.w + 7) >> 3) * y + x;
buf_u8[px] = buf_u8[px] & ~(1 << (7 - bit));
buf_u8[px] = buf_u8[px] | ((c.full & 0x1) << (7 - bit));
} else if(dsc->header.cf == LV_IMG_CF_INDEXED_2BIT) {
buf_u8 += sizeof(lv_color32_t) * 4; /*Skip the palette*/
uint8_t bit = (x & 0x3) * 2;
x = x >> 2;
/* Get the current pixel.
* dsc->header.w + 3 means rounding up to 4 because the lines are byte aligned
* so the possible real width are 4, 8 ,12 ...*/
uint32_t px = ((dsc->header.w + 3) >> 2) * y + x;
buf_u8[px] = buf_u8[px] & ~(3 << (6 - bit));
buf_u8[px] = buf_u8[px] | ((c.full & 0x3) << (6 - bit));
} else if(dsc->header.cf == LV_IMG_CF_INDEXED_4BIT) {
buf_u8 += sizeof(lv_color32_t) * 16; /*Skip the palette*/
uint8_t bit = (x & 0x1) * 4;
x = x >> 1;
/* Get the current pixel.
* dsc->header.w + 1 means rounding up to 2 because the lines are byte aligned
* so the possible real width are 2 ,4, 6 ...*/
uint32_t px = ((dsc->header.w + 1) >> 1) * y + x;
buf_u8[px] = buf_u8[px] & ~(0xF << (4 - bit));
buf_u8[px] = buf_u8[px] | ((c.full & 0xF) << (4 - bit));
} else if(dsc->header.cf == LV_IMG_CF_INDEXED_8BIT) {
buf_u8 += sizeof(lv_color32_t) * 256; /*Skip the palette*/
uint32_t px = dsc->header.w * y + x;
buf_u8[px] = c.full;
}
}
/**
* Set the palette color of an indexed image. Valid only for `LV_IMG_CF_INDEXED1/2/4/8`
* @param dsc pointer to an image descriptor
* @param id the palette color to set:
* - for `LV_IMG_CF_INDEXED1`: 0..1
* - for `LV_IMG_CF_INDEXED2`: 0..3
* - for `LV_IMG_CF_INDEXED4`: 0..15
* - for `LV_IMG_CF_INDEXED8`: 0..255
* @param c the color to set
*/
void lv_img_buf_set_palette(lv_img_dsc_t * dsc, uint8_t id, lv_color_t c)
{
if((dsc->header.cf == LV_IMG_CF_ALPHA_1BIT && id > 1) || (dsc->header.cf == LV_IMG_CF_ALPHA_2BIT && id > 3) ||
(dsc->header.cf == LV_IMG_CF_ALPHA_4BIT && id > 15) || (dsc->header.cf == LV_IMG_CF_ALPHA_8BIT)) {
LV_LOG_WARN("lv_img_buf_set_px_alpha: invalid 'id'");
return;
}
lv_color32_t c32;
c32.full = lv_color_to32(c);
uint8_t * buf = (uint8_t *)dsc->data;
memcpy(&buf[id * sizeof(c32)], &c32, sizeof(c32));
}
/**
* Allocate an image buffer in RAM
* @param w width of image
* @param h height of image
* @param cf a color format (`LV_IMG_CF_...`)
* @return an allocated image, or NULL on failure
*/
lv_img_dsc_t *lv_img_buf_alloc(lv_coord_t w, lv_coord_t h, lv_img_cf_t cf)
{
/* Allocate image descriptor */
lv_img_dsc_t *dsc = lv_mem_alloc(sizeof(lv_img_dsc_t));
if(dsc == NULL)
return NULL;
memset(dsc, 0, sizeof(lv_img_dsc_t));
/* Get image data size */
dsc->data_size = lv_img_buf_get_img_size(w, h, cf);
if(dsc->data_size == 0) {
lv_mem_free(dsc);
return NULL;
}
/* Allocate raw buffer */
dsc->data = lv_mem_alloc(dsc->data_size);
if(dsc->data == NULL) {
lv_mem_free(dsc);
return NULL;
}
memset((uint8_t *)dsc->data, 0, dsc->data_size);
/* Fill in header */
dsc->header.always_zero = 0;
dsc->header.w = w;
dsc->header.h = h;
dsc->header.cf = cf;
return dsc;
}
/**
* Free an allocated image buffer
* @param dsc image buffer to free
*/
void lv_img_buf_free(lv_img_dsc_t *dsc)
{
if(dsc != NULL) {
if(dsc->data != NULL)
lv_mem_free(dsc->data);
lv_mem_free(dsc);
}
}
/**
* Get the memory consumption of a raw bitmap, given color format and dimensions.
* @param w width
* @param h height
* @param cf color format
* @return size in bytes
*/
uint32_t lv_img_buf_get_img_size(lv_coord_t w, lv_coord_t h, lv_img_cf_t cf)
{
switch(cf) {
case LV_IMG_CF_TRUE_COLOR: return LV_IMG_BUF_SIZE_TRUE_COLOR(w, h);
case LV_IMG_CF_TRUE_COLOR_ALPHA: return LV_IMG_BUF_SIZE_TRUE_COLOR_ALPHA(w, h);
case LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED: return LV_IMG_BUF_SIZE_TRUE_COLOR_CHROMA_KEYED(w, h);
case LV_IMG_CF_ALPHA_1BIT: return LV_IMG_BUF_SIZE_ALPHA_1BIT(w, h);
case LV_IMG_CF_ALPHA_2BIT: return LV_IMG_BUF_SIZE_ALPHA_2BIT(w, h);
case LV_IMG_CF_ALPHA_4BIT: return LV_IMG_BUF_SIZE_ALPHA_4BIT(w, h);
case LV_IMG_CF_ALPHA_8BIT: return LV_IMG_BUF_SIZE_ALPHA_8BIT(w, h);
case LV_IMG_CF_INDEXED_1BIT: return LV_IMG_BUF_SIZE_INDEXED_1BIT(w, h);
case LV_IMG_CF_INDEXED_2BIT: return LV_IMG_BUF_SIZE_INDEXED_2BIT(w, h);
case LV_IMG_CF_INDEXED_4BIT: return LV_IMG_BUF_SIZE_INDEXED_4BIT(w, h);
case LV_IMG_CF_INDEXED_8BIT: return LV_IMG_BUF_SIZE_INDEXED_8BIT(w, h);
default: return 0;
}
}
/**
* Initialize a descriptor to tranform an image
* @param dsc pointer to an `lv_img_transform_dsc_t` variable whose `cfg` field is initialized
*/
void lv_img_buf_transform_init(lv_img_transform_dsc_t * dsc)
{
dsc->tmp.pivot_x_256 = dsc->cfg.pivot_x * 256;
dsc->tmp.pivot_y_256 = dsc->cfg.pivot_y * 256;
dsc->tmp.sinma = lv_trigo_sin(-dsc->cfg.angle);
dsc->tmp.cosma = lv_trigo_sin(-dsc->cfg.angle + 90);
dsc->tmp.chroma_keyed = lv_img_cf_is_chroma_keyed(dsc->cfg.cf) ? 1 : 0;
dsc->tmp.has_alpha = lv_img_cf_has_alpha(dsc->cfg.cf) ? 1 : 0;
if(dsc->cfg.cf == LV_IMG_CF_TRUE_COLOR || dsc->cfg.cf == LV_IMG_CF_TRUE_COLOR_ALPHA || dsc->cfg.cf == LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED) {
dsc->tmp.native_color = 1;
}
dsc->tmp.img_dsc.data = dsc->cfg.src;
dsc->tmp.img_dsc.header.always_zero = 0;
dsc->tmp.img_dsc.header.cf = dsc->cfg.cf;
dsc->tmp.img_dsc.header.w = dsc->cfg.src_w;
dsc->tmp.img_dsc.header.h = dsc->cfg.src_h;
dsc->tmp.zoom_inv = (256 * 256) / dsc->cfg.zoom;
dsc->res.opa = LV_OPA_COVER;
dsc->res.color = dsc->cfg.color;
}
/**
* Get which color and opa would come to a pixel if it were rotated
* @param dsc a descriptor initialized by `lv_img_buf_rotate_init`
* @param x the coordinate which color and opa should be get
* @param y the coordinate which color and opa should be get
* @return true: there is valid pixel on these x/y coordinates; false: the rotated pixel was out of the image
* @note the result is written back to `dsc->res_color` and `dsc->res_opa`
*/
bool lv_img_buf_transform(lv_img_transform_dsc_t * dsc, lv_coord_t x, lv_coord_t y)
{
const uint8_t * src_u8 = dsc->cfg.src;
/*Get the target point relative coordinates to the pivot*/
int32_t xt = x - dsc->cfg.pivot_x;
int32_t yt = y - dsc->cfg.pivot_y;
int32_t xs;
int32_t ys;
if(dsc->cfg.zoom == LV_IMG_ZOOM_NONE) {
/*Get the source pixel from the upscaled image*/
xs = ((dsc->tmp.cosma * xt - dsc->tmp.sinma * yt) >> (LV_TRIGO_SHIFT - 8)) + dsc->tmp.pivot_x_256;
ys = ((dsc->tmp.sinma * xt + dsc->tmp.cosma * yt) >> (LV_TRIGO_SHIFT - 8)) + dsc->tmp.pivot_y_256;
} else {
xt *= dsc->tmp.zoom_inv;
yt *= dsc->tmp.zoom_inv;
xs = ((dsc->tmp.cosma * xt - dsc->tmp.sinma * yt) >> (LV_TRIGO_SHIFT)) + dsc->tmp.pivot_x_256;
ys = ((dsc->tmp.sinma * xt + dsc->tmp.cosma * yt) >> (LV_TRIGO_SHIFT)) + dsc->tmp.pivot_y_256;
}
/*Get the integer part of the source pixel*/
int xs_int = xs >> 8;
int ys_int = ys >> 8;
if(xs_int >= dsc->cfg.src_w) return false;
else if(xs_int < 0) return false;
if(ys_int >= dsc->cfg.src_h) return false;
else if(ys_int < 0) return false;
/* If the fractional < 0x70 mix the source pixel with the left/top pixel
* If the fractional > 0x90 mix the source pixel with the right/bottom pixel
* In the 0x70..0x90 range use the unchanged source pixel */
uint8_t px_size;
uint32_t pxi;
if(dsc->tmp.native_color) {
if(dsc->tmp.has_alpha == 0) {
px_size = LV_COLOR_SIZE >> 3;
pxi = dsc->cfg.src_w * ys_int * px_size + xs_int * px_size;
memcpy(&dsc->res.color, &src_u8[pxi], px_size);
} else {
px_size = LV_IMG_PX_SIZE_ALPHA_BYTE;
pxi = dsc->cfg.src_w * ys_int * px_size + xs_int * px_size;
memcpy(&dsc->res.color, &src_u8[pxi], px_size - 1);
dsc->res.opa = src_u8[pxi + px_size - 1];
}
} else {
pxi = 0; /*unused*/
px_size = 0; /*unused*/
dsc->res.color = lv_img_buf_get_px_color(&dsc->tmp.img_dsc, xs_int, ys_int, dsc->cfg.color);
dsc->res.opa = lv_img_buf_get_px_alpha(&dsc->tmp.img_dsc, xs_int, ys_int);
}
if(dsc->tmp.chroma_keyed) {
lv_color_t ct = LV_COLOR_TRANSP;
if(dsc->res.color.full == ct.full) return false;
}
if(dsc->cfg.antialias == false) return true;
dsc->tmp.xs = xs;
dsc->tmp.ys = ys;
dsc->tmp.xs_int = xs_int;
dsc->tmp.ys_int = ys_int;
dsc->tmp.pxi = pxi;
dsc->tmp.px_size = px_size;
bool ret;
ret = transform_anti_alias(dsc);
return ret;
}
/**********************
* STATIC FUNCTIONS
**********************/
static inline bool transform_anti_alias(lv_img_transform_dsc_t * dsc)
{
const uint8_t * src_u8 = dsc->cfg.src;
/*Get the fractional part of the source pixel*/
int xs_fract = dsc->tmp.xs & 0xff;
int ys_fract = dsc->tmp.ys & 0xff;
int32_t xn; /*x neightboor*/
lv_opa_t xr; /*x mix ratio*/
if(xs_fract < 0x70) {
xn = - 1;
if(dsc->tmp.xs_int + xn < 0) xn = 0;
xr = xs_fract + 0x80;
} else if(xs_fract > 0x90) {
xn = 1;
if(dsc->tmp.xs_int + xn >= dsc->cfg.src_w) xn = 0;
xr = (0xFF - xs_fract) + 0x80;
} else {
xn = 0;
xr = 0xFF;
}
int32_t yn; /*x neightboor*/
lv_opa_t yr; /*x mix ratio*/
if(ys_fract < 0x70) {
yn = - 1;
if(dsc->tmp.ys_int + yn < 0) yn = 0;
yr = ys_fract + 0x80;
} else if(ys_fract > 0x90) {
yn = 1;
if(dsc->tmp.ys_int + yn >= dsc->cfg.src_h) yn = 0;
yr = (0xFF - ys_fract) + 0x80;
} else {
yn = 0;
yr = 0xFF;
}
lv_color_t c00 = dsc->res.color;
lv_color_t c01;
lv_color_t c10;
lv_color_t c11;
lv_opa_t a00 = dsc->res.opa;
lv_opa_t a10 = 0;
lv_opa_t a01 = 0;
lv_opa_t a11 = 0;
if(dsc->tmp.native_color) {
memcpy(&c01, &src_u8[dsc->tmp.pxi + dsc->tmp.px_size * xn], sizeof(lv_color_t));
memcpy(&c10, &src_u8[dsc->tmp.pxi + dsc->cfg.src_w * dsc->tmp.px_size * yn], sizeof(lv_color_t));
memcpy(&c11, &src_u8[dsc->tmp.pxi + dsc->cfg.src_w * dsc->tmp.px_size * yn + dsc->tmp.px_size * xn], sizeof(lv_color_t));
if(dsc->tmp.has_alpha) {
a10 = src_u8[dsc->tmp.pxi + dsc->tmp.px_size * xn + dsc->tmp.px_size - 1];
a01 = src_u8[dsc->tmp.pxi + dsc->cfg.src_w * dsc->tmp.px_size * yn + dsc->tmp.px_size - 1];
a11 = src_u8[dsc->tmp.pxi + dsc->cfg.src_w * dsc->tmp.px_size * yn + dsc->tmp.px_size * xn + dsc->tmp.px_size - 1];
}
} else {
c01 = lv_img_buf_get_px_color(&dsc->tmp.img_dsc, dsc->tmp.xs_int + xn, dsc->tmp.ys_int, dsc->cfg.color);
c10 = lv_img_buf_get_px_color(&dsc->tmp.img_dsc, dsc->tmp.xs_int, dsc->tmp.ys_int + yn, dsc->cfg.color);
c11 = lv_img_buf_get_px_color(&dsc->tmp.img_dsc, dsc->tmp.xs_int + xn, dsc->tmp.ys_int + yn, dsc->cfg.color);
if(dsc->tmp.has_alpha) {
a10 = lv_img_buf_get_px_alpha(&dsc->tmp.img_dsc, dsc->tmp.xs_int + xn, dsc->tmp.ys_int);
a01 = lv_img_buf_get_px_alpha(&dsc->tmp.img_dsc, dsc->tmp.xs_int, dsc->tmp.ys_int + yn);
a11 = lv_img_buf_get_px_alpha(&dsc->tmp.img_dsc, dsc->tmp.xs_int + xn, dsc->tmp.ys_int + yn);
}
}
lv_opa_t a0;
lv_opa_t a1;
lv_opa_t xr0 = xr;
lv_opa_t xr1 = xr;
if(dsc->tmp.has_alpha) {
a0 = (a00 * xr + (a10 * (255 - xr))) >> 8;
a1 = (a01 * xr + (a11 * (255 - xr))) >> 8;
dsc->res.opa = (a0 * yr + (a1 * (255 - yr))) >> 8;
if(a0 <= LV_OPA_MIN && a1 <= LV_OPA_MIN) return false;
if(a0 <= LV_OPA_MIN) yr = LV_OPA_TRANSP;
if(a1 <= LV_OPA_MIN) yr = LV_OPA_COVER;
if(a00 <= LV_OPA_MIN) xr0 = LV_OPA_TRANSP;
if(a10 <= LV_OPA_MIN) xr0 = LV_OPA_COVER;
if(a01 <= LV_OPA_MIN) xr1 = LV_OPA_TRANSP;
if(a11 <= LV_OPA_MIN) xr1 = LV_OPA_COVER;
} else {
xr0 = xr;
xr1 = xr;
dsc->res.opa = LV_OPA_COVER;
}
lv_color_t c0 = lv_color_mix(c00, c01, xr0);
lv_color_t c1 = lv_color_mix(c10, c11, xr1);
dsc->res.color = lv_color_mix(c0, c1, yr);
return true;
}