1 /**
2 * @file lv_color.h
3 *
4 */
5
6 #ifndef LV_COLOR_H
7 #define LV_COLOR_H
8
9 #ifdef __cplusplus
10 extern "C" {
11 #endif
12
13 /*********************
14 * INCLUDES
15 *********************/
16 #include "../lv_conf_internal.h"
17 #include "lv_assert.h"
18 #include "lv_math.h"
19 #include "lv_types.h"
20
21 /*Error checking*/
22 #if LV_COLOR_DEPTH == 24
23 #error "LV_COLOR_DEPTH 24 is deprecated. Use LV_COLOR_DEPTH 32 instead (lv_conf.h)"
24 #endif
25
26 #if LV_COLOR_DEPTH != 16 && LV_COLOR_16_SWAP != 0
27 #error "LV_COLOR_16_SWAP requires LV_COLOR_DEPTH == 16. Set it in lv_conf.h"
28 #endif
29
30 #include <stdint.h>
31
32 /*********************
33 * DEFINES
34 *********************/
35 LV_EXPORT_CONST_INT(LV_COLOR_DEPTH);
36 LV_EXPORT_CONST_INT(LV_COLOR_16_SWAP);
37
38 /**
39 * Opacity percentages.
40 */
41 enum {
42 LV_OPA_TRANSP = 0,
43 LV_OPA_0 = 0,
44 LV_OPA_10 = 25,
45 LV_OPA_20 = 51,
46 LV_OPA_30 = 76,
47 LV_OPA_40 = 102,
48 LV_OPA_50 = 127,
49 LV_OPA_60 = 153,
50 LV_OPA_70 = 178,
51 LV_OPA_80 = 204,
52 LV_OPA_90 = 229,
53 LV_OPA_100 = 255,
54 LV_OPA_COVER = 255,
55 };
56
57 #define LV_OPA_MIN 2 /*Opacities below this will be transparent*/
58 #define LV_OPA_MAX 253 /*Opacities above this will fully cover*/
59
60 #if LV_COLOR_DEPTH == 1
61 #define LV_COLOR_SIZE 8
62 #elif LV_COLOR_DEPTH == 8
63 #define LV_COLOR_SIZE 8
64 #elif LV_COLOR_DEPTH == 16
65 #define LV_COLOR_SIZE 16
66 #elif LV_COLOR_DEPTH == 32
67 #define LV_COLOR_SIZE 32
68 #else
69 #error "Invalid LV_COLOR_DEPTH in lv_conf.h! Set it to 1, 8, 16 or 32!"
70 #endif
71
72 #if defined(__cplusplus) && !defined(_LV_COLOR_HAS_MODERN_CPP)
73 /**
74 * MSVC compiler's definition of the __cplusplus indicating 199711L regardless to C++ standard version
75 * see https://devblogs.microsoft.com/cppblog/msvc-now-correctly-reports-cplusplus
76 * so we use _MSC_VER macro instead of __cplusplus
77 */
78 #ifdef _MSC_VER
79 #if _MSC_VER >= 1900 /*Visual Studio 2015*/
80 #define _LV_COLOR_HAS_MODERN_CPP 1
81 #endif
82 #else
83 #if __cplusplus >= 201103L
84 #define _LV_COLOR_HAS_MODERN_CPP 1
85 #endif
86 #endif
87 #endif /*__cplusplus*/
88
89 #ifndef _LV_COLOR_HAS_MODERN_CPP
90 #define _LV_COLOR_HAS_MODERN_CPP 0
91 #endif
92
93 #if _LV_COLOR_HAS_MODERN_CPP
94 /*Fix msvc compiler error C4576 inside C++ code*/
95 #define _LV_COLOR_MAKE_TYPE_HELPER lv_color_t
96 #else
97 #define _LV_COLOR_MAKE_TYPE_HELPER (lv_color_t)
98 #endif
99
100 /*---------------------------------------
101 * Macros for all existing color depths
102 * to set/get values of the color channels
103 *------------------------------------------*/
104 # define LV_COLOR_SET_R1(c, v) (c).ch.red = (uint8_t)((v) & 0x1)
105 # define LV_COLOR_SET_G1(c, v) (c).ch.green = (uint8_t)((v) & 0x1)
106 # define LV_COLOR_SET_B1(c, v) (c).ch.blue = (uint8_t)((v) & 0x1)
107 # define LV_COLOR_SET_A1(c, v) do {} while(0)
108
109 # define LV_COLOR_GET_R1(c) (c).ch.red
110 # define LV_COLOR_GET_G1(c) (c).ch.green
111 # define LV_COLOR_GET_B1(c) (c).ch.blue
112 # define LV_COLOR_GET_A1(c) 0xFF
113
114 # define _LV_COLOR_ZERO_INITIALIZER1 {0x00}
115 # define LV_COLOR_MAKE1(r8, g8, b8) {(uint8_t)((b8 >> 7) | (g8 >> 7) | (r8 >> 7))}
116
117 # define LV_COLOR_SET_R8(c, v) (c).ch.red = (uint8_t)((v) & 0x7U)
118 # define LV_COLOR_SET_G8(c, v) (c).ch.green = (uint8_t)((v) & 0x7U)
119 # define LV_COLOR_SET_B8(c, v) (c).ch.blue = (uint8_t)((v) & 0x3U)
120 # define LV_COLOR_SET_A8(c, v) do {} while(0)
121
122 # define LV_COLOR_GET_R8(c) (c).ch.red
123 # define LV_COLOR_GET_G8(c) (c).ch.green
124 # define LV_COLOR_GET_B8(c) (c).ch.blue
125 # define LV_COLOR_GET_A8(c) 0xFF
126
127 # define _LV_COLOR_ZERO_INITIALIZER8 {{0x00, 0x00, 0x00}}
128 # define LV_COLOR_MAKE8(r8, g8, b8) {{(uint8_t)((b8 >> 6) & 0x3U), (uint8_t)((g8 >> 5) & 0x7U), (uint8_t)((r8 >> 5) & 0x7U)}}
129
130 # define LV_COLOR_SET_R16(c, v) (c).ch.red = (uint8_t)((v) & 0x1FU)
131 #if LV_COLOR_16_SWAP == 0
132 # define LV_COLOR_SET_G16(c, v) (c).ch.green = (uint8_t)((v) & 0x3FU)
133 #else
134 # define LV_COLOR_SET_G16(c, v) {(c).ch.green_h = (uint8_t)(((v) >> 3) & 0x7); (c).ch.green_l = (uint8_t)((v) & 0x7);}
135 #endif
136 # define LV_COLOR_SET_B16(c, v) (c).ch.blue = (uint8_t)((v) & 0x1FU)
137 # define LV_COLOR_SET_A16(c, v) do {} while(0)
138
139 # define LV_COLOR_GET_R16(c) (c).ch.red
140 #if LV_COLOR_16_SWAP == 0
141 # define LV_COLOR_GET_G16(c) (c).ch.green
142 #else
143 # define LV_COLOR_GET_G16(c) (((c).ch.green_h << 3) + (c).ch.green_l)
144 #endif
145 # define LV_COLOR_GET_B16(c) (c).ch.blue
146 # define LV_COLOR_GET_A16(c) 0xFF
147
148 #if LV_COLOR_16_SWAP == 0
149 # define _LV_COLOR_ZERO_INITIALIZER16 {{0x00, 0x00, 0x00}}
150 # define LV_COLOR_MAKE16(r8, g8, b8) {{(uint8_t)((b8 >> 3) & 0x1FU), (uint8_t)((g8 >> 2) & 0x3FU), (uint8_t)((r8 >> 3) & 0x1FU)}}
151 #else
152 # define _LV_COLOR_ZERO_INITIALIZER16 {{0x00, 0x00, 0x00, 0x00}}
153 # define LV_COLOR_MAKE16(r8, g8, b8) {{(uint8_t)((g8 >> 5) & 0x7U), (uint8_t)((r8 >> 3) & 0x1FU), (uint8_t)((b8 >> 3) & 0x1FU), (uint8_t)((g8 >> 2) & 0x7U)}}
154 #endif
155
156 # define LV_COLOR_SET_R32(c, v) (c).ch.red = (uint8_t)((v) & 0xFF)
157 # define LV_COLOR_SET_G32(c, v) (c).ch.green = (uint8_t)((v) & 0xFF)
158 # define LV_COLOR_SET_B32(c, v) (c).ch.blue = (uint8_t)((v) & 0xFF)
159 # define LV_COLOR_SET_A32(c, v) (c).ch.alpha = (uint8_t)((v) & 0xFF)
160
161 # define LV_COLOR_GET_R32(c) (c).ch.red
162 # define LV_COLOR_GET_G32(c) (c).ch.green
163 # define LV_COLOR_GET_B32(c) (c).ch.blue
164 # define LV_COLOR_GET_A32(c) (c).ch.alpha
165
166 # define _LV_COLOR_ZERO_INITIALIZER32 {{0x00, 0x00, 0x00, 0x00}}
167 # define LV_COLOR_MAKE32(r8, g8, b8) {{b8, g8, r8, 0xff}} /*Fix 0xff alpha*/
168
169 /*---------------------------------------
170 * Macros for the current color depth
171 * to set/get values of the color channels
172 *------------------------------------------*/
173 #define LV_COLOR_SET_R(c, v) LV_CONCAT(LV_COLOR_SET_R, LV_COLOR_DEPTH)(c, v)
174 #define LV_COLOR_SET_G(c, v) LV_CONCAT(LV_COLOR_SET_G, LV_COLOR_DEPTH)(c, v)
175 #define LV_COLOR_SET_B(c, v) LV_CONCAT(LV_COLOR_SET_B, LV_COLOR_DEPTH)(c, v)
176 #define LV_COLOR_SET_A(c, v) LV_CONCAT(LV_COLOR_SET_A, LV_COLOR_DEPTH)(c, v)
177
178 #define LV_COLOR_GET_R(c) LV_CONCAT(LV_COLOR_GET_R, LV_COLOR_DEPTH)(c)
179 #define LV_COLOR_GET_G(c) LV_CONCAT(LV_COLOR_GET_G, LV_COLOR_DEPTH)(c)
180 #define LV_COLOR_GET_B(c) LV_CONCAT(LV_COLOR_GET_B, LV_COLOR_DEPTH)(c)
181 #define LV_COLOR_GET_A(c) LV_CONCAT(LV_COLOR_GET_A, LV_COLOR_DEPTH)(c)
182
183 #define _LV_COLOR_ZERO_INITIALIZER LV_CONCAT(_LV_COLOR_ZERO_INITIALIZER, LV_COLOR_DEPTH)
184 #define LV_COLOR_MAKE(r8, g8, b8) LV_CONCAT(LV_COLOR_MAKE, LV_COLOR_DEPTH)(r8, g8, b8)
185
186 /**********************
187 * TYPEDEFS
188 **********************/
189
190 typedef union {
191 uint8_t full; /*must be declared first to set all bits of byte via initializer list*/
192 union {
193 uint8_t blue : 1;
194 uint8_t green : 1;
195 uint8_t red : 1;
196 } ch;
197 } lv_color1_t;
198
199 typedef union {
200 struct {
201 uint8_t blue : 2;
202 uint8_t green : 3;
203 uint8_t red : 3;
204 } ch;
205 uint8_t full;
206 } lv_color8_t;
207
208 typedef union {
209 struct {
210 #if LV_COLOR_16_SWAP == 0
211 uint16_t blue : 5;
212 uint16_t green : 6;
213 uint16_t red : 5;
214 #else
215 uint16_t green_h : 3;
216 uint16_t red : 5;
217 uint16_t blue : 5;
218 uint16_t green_l : 3;
219 #endif
220 } ch;
221 uint16_t full;
222 } lv_color16_t;
223
224 typedef union {
225 struct {
226 uint8_t blue;
227 uint8_t green;
228 uint8_t red;
229 uint8_t alpha;
230 } ch;
231 uint32_t full;
232 } lv_color32_t;
233
234 typedef LV_CONCAT3(uint, LV_COLOR_SIZE, _t) lv_color_int_t;
235 typedef LV_CONCAT3(lv_color, LV_COLOR_DEPTH, _t) lv_color_t;
236
237 typedef struct {
238 uint16_t h;
239 uint8_t s;
240 uint8_t v;
241 } lv_color_hsv_t;
242
243 //! @cond Doxygen_Suppress
244 /*No idea where the guard is required but else throws warnings in the docs*/
245 typedef uint8_t lv_opa_t;
246 //! @endcond
247
248 struct _lv_color_filter_dsc_t;
249
250 typedef lv_color_t (*lv_color_filter_cb_t)(const struct _lv_color_filter_dsc_t *, lv_color_t, lv_opa_t);
251
252 typedef struct _lv_color_filter_dsc_t {
253 lv_color_filter_cb_t filter_cb;
254 void * user_data;
255 } lv_color_filter_dsc_t;
256
257
258 typedef enum {
259 LV_PALETTE_RED,
260 LV_PALETTE_PINK,
261 LV_PALETTE_PURPLE,
262 LV_PALETTE_DEEP_PURPLE,
263 LV_PALETTE_INDIGO,
264 LV_PALETTE_BLUE,
265 LV_PALETTE_LIGHT_BLUE,
266 LV_PALETTE_CYAN,
267 LV_PALETTE_TEAL,
268 LV_PALETTE_GREEN,
269 LV_PALETTE_LIGHT_GREEN,
270 LV_PALETTE_LIME,
271 LV_PALETTE_YELLOW,
272 LV_PALETTE_AMBER,
273 LV_PALETTE_ORANGE,
274 LV_PALETTE_DEEP_ORANGE,
275 LV_PALETTE_BROWN,
276 LV_PALETTE_BLUE_GREY,
277 LV_PALETTE_GREY,
278 _LV_PALETTE_LAST,
279 LV_PALETTE_NONE = 0xff,
280 } lv_palette_t;
281
282 /**********************
283 * GLOBAL PROTOTYPES
284 **********************/
285
286 /*In color conversations:
287 * - When converting to bigger color type the LSB weight of 1 LSB is calculated
288 * E.g. 16 bit Red has 5 bits
289 * 8 bit Red has 3 bits
290 * ----------------------
291 * 8 bit red LSB = (2^5 - 1) / (2^3 - 1) = 31 / 7 = 4
292 *
293 * - When calculating to smaller color type simply shift out the LSBs
294 * E.g. 8 bit Red has 3 bits
295 * 16 bit Red has 5 bits
296 * ----------------------
297 * Shift right with 5 - 3 = 2
298 */
lv_color_to1(lv_color_t color)299 static inline uint8_t lv_color_to1(lv_color_t color)
300 {
301 #if LV_COLOR_DEPTH == 1
302 return color.full;
303 #elif LV_COLOR_DEPTH == 8
304 if((LV_COLOR_GET_R(color) & 0x4) || (LV_COLOR_GET_G(color) & 0x4) || (LV_COLOR_GET_B(color) & 0x2)) {
305 return 1;
306 }
307 else {
308 return 0;
309 }
310 #elif LV_COLOR_DEPTH == 16
311 if((LV_COLOR_GET_R(color) & 0x10) || (LV_COLOR_GET_G(color) & 0x20) || (LV_COLOR_GET_B(color) & 0x10)) {
312 return 1;
313 }
314 else {
315 return 0;
316 }
317 #elif LV_COLOR_DEPTH == 32
318 if((LV_COLOR_GET_R(color) & 0x80) || (LV_COLOR_GET_G(color) & 0x80) || (LV_COLOR_GET_B(color) & 0x80)) {
319 return 1;
320 }
321 else {
322 return 0;
323 }
324 #endif
325 }
326
lv_color_to8(lv_color_t color)327 static inline uint8_t lv_color_to8(lv_color_t color)
328 {
329 #if LV_COLOR_DEPTH == 1
330 if(color.full == 0)
331 return 0;
332 else
333 return 0xFF;
334 #elif LV_COLOR_DEPTH == 8
335 return color.full;
336 #elif LV_COLOR_DEPTH == 16
337 lv_color8_t ret;
338 LV_COLOR_SET_R8(ret, LV_COLOR_GET_R(color) >> 2); /*5 - 3 = 2*/
339 LV_COLOR_SET_G8(ret, LV_COLOR_GET_G(color) >> 3); /*6 - 3 = 3*/
340 LV_COLOR_SET_B8(ret, LV_COLOR_GET_B(color) >> 3); /*5 - 2 = 3*/
341 return ret.full;
342 #elif LV_COLOR_DEPTH == 32
343 lv_color8_t ret;
344 LV_COLOR_SET_R8(ret, LV_COLOR_GET_R(color) >> 5); /*8 - 3 = 5*/
345 LV_COLOR_SET_G8(ret, LV_COLOR_GET_G(color) >> 5); /*8 - 3 = 5*/
346 LV_COLOR_SET_B8(ret, LV_COLOR_GET_B(color) >> 6); /*8 - 2 = 6*/
347 return ret.full;
348 #endif
349 }
350
lv_color_to16(lv_color_t color)351 static inline uint16_t lv_color_to16(lv_color_t color)
352 {
353 #if LV_COLOR_DEPTH == 1
354 if(color.full == 0)
355 return 0;
356 else
357 return 0xFFFF;
358 #elif LV_COLOR_DEPTH == 8
359 lv_color16_t ret;
360 LV_COLOR_SET_R16(ret, LV_COLOR_GET_R(color) * 4); /*(2^5 - 1)/(2^3 - 1) = 31/7 = 4*/
361 LV_COLOR_SET_G16(ret, LV_COLOR_GET_G(color) * 9); /*(2^6 - 1)/(2^3 - 1) = 63/7 = 9*/
362 LV_COLOR_SET_B16(ret, LV_COLOR_GET_B(color) * 10); /*(2^5 - 1)/(2^2 - 1) = 31/3 = 10*/
363 return ret.full;
364 #elif LV_COLOR_DEPTH == 16
365 return color.full;
366 #elif LV_COLOR_DEPTH == 32
367 lv_color16_t ret;
368 LV_COLOR_SET_R16(ret, LV_COLOR_GET_R(color) >> 3); /*8 - 5 = 3*/
369 LV_COLOR_SET_G16(ret, LV_COLOR_GET_G(color) >> 2); /*8 - 6 = 2*/
370 LV_COLOR_SET_B16(ret, LV_COLOR_GET_B(color) >> 3); /*8 - 5 = 3*/
371 return ret.full;
372 #endif
373 }
374
lv_color_to32(lv_color_t color)375 static inline uint32_t lv_color_to32(lv_color_t color)
376 {
377 #if LV_COLOR_DEPTH == 1
378 if(color.full == 0)
379 return 0xFF000000;
380 else
381 return 0xFFFFFFFF;
382 #elif LV_COLOR_DEPTH == 8
383 lv_color32_t ret;
384 LV_COLOR_SET_R32(ret, LV_COLOR_GET_R(color) * 36); /*(2^8 - 1)/(2^3 - 1) = 255/7 = 36*/
385 LV_COLOR_SET_G32(ret, LV_COLOR_GET_G(color) * 36); /*(2^8 - 1)/(2^3 - 1) = 255/7 = 36*/
386 LV_COLOR_SET_B32(ret, LV_COLOR_GET_B(color) * 85); /*(2^8 - 1)/(2^2 - 1) = 255/3 = 85*/
387 LV_COLOR_SET_A32(ret, 0xFF);
388 return ret.full;
389 #elif LV_COLOR_DEPTH == 16
390 /**
391 * The floating point math for conversion is:
392 * valueto = valuefrom * ( (2^bitsto - 1) / (float)(2^bitsfrom - 1) )
393 * The faster integer math for conversion is:
394 * valueto = ( valuefrom * multiplier + adder ) >> divisor
395 * multiplier = FLOOR( ( (2^bitsto - 1) << divisor ) / (float)(2^bitsfrom - 1) )
396 *
397 * Find the first divisor where ( adder >> divisor ) <= 0
398 *
399 * 5-bit to 8-bit: ( 31 * multiplier + adder ) >> divisor = 255
400 * divisor multiplier adder min (0) max (31)
401 * 0 8 7 7 255
402 * 1 16 14 7 255
403 * 2 32 28 7 255
404 * 3 65 25 3 255
405 * 4 131 19 1 255
406 * 5 263 7 0 255
407 *
408 * 6-bit to 8-bit: 255 = ( 63 * multiplier + adder ) >> divisor
409 * divisor multiplier adder min (0) max (63)
410 * 0 4 3 3 255
411 * 1 8 6 3 255
412 * 2 16 12 3 255
413 * 3 32 24 3 255
414 * 4 64 48 3 255
415 * 5 129 33 1 255
416 * 6 259 3 0 255
417 */
418
419 lv_color32_t ret;
420 LV_COLOR_SET_R32(ret, (LV_COLOR_GET_R(color) * 263 + 7) >> 5);
421 LV_COLOR_SET_G32(ret, (LV_COLOR_GET_G(color) * 259 + 3) >> 6);
422 LV_COLOR_SET_B32(ret, (LV_COLOR_GET_B(color) * 263 + 7) >> 5);
423 LV_COLOR_SET_A32(ret, 0xFF);
424 return ret.full;
425 #elif LV_COLOR_DEPTH == 32
426 return color.full;
427 #endif
428 }
429
430 //! @cond Doxygen_Suppress
431
432 /**
433 * Mix two colors with a given ratio.
434 * @param c1 the first color to mix (usually the foreground)
435 * @param c2 the second color to mix (usually the background)
436 * @param mix The ratio of the colors. 0: full `c2`, 255: full `c1`, 127: half `c1` and half`c2`
437 * @return the mixed color
438 */
lv_color_mix(lv_color_t c1,lv_color_t c2,uint8_t mix)439 LV_ATTRIBUTE_FAST_MEM static inline lv_color_t lv_color_mix(lv_color_t c1, lv_color_t c2, uint8_t mix)
440 {
441 lv_color_t ret;
442
443 #if LV_COLOR_DEPTH == 16 && LV_COLOR_MIX_ROUND_OFS == 0
444 #if LV_COLOR_16_SWAP == 1
445 c1.full = c1.full << 8 | c1.full >> 8;
446 c2.full = c2.full << 8 | c2.full >> 8;
447 #endif
448 /*Source: https://stackoverflow.com/a/50012418/1999969*/
449 mix = (uint32_t)((uint32_t)mix + 4) >> 3;
450 uint32_t bg = (uint32_t)((uint32_t)c2.full | ((uint32_t)c2.full << 16)) &
451 0x7E0F81F; /*0b00000111111000001111100000011111*/
452 uint32_t fg = (uint32_t)((uint32_t)c1.full | ((uint32_t)c1.full << 16)) & 0x7E0F81F;
453 uint32_t result = ((((fg - bg) * mix) >> 5) + bg) & 0x7E0F81F;
454 ret.full = (uint16_t)((result >> 16) | result);
455 #if LV_COLOR_16_SWAP == 1
456 ret.full = ret.full << 8 | ret.full >> 8;
457 #endif
458 #elif LV_COLOR_DEPTH != 1
459 /*LV_COLOR_DEPTH == 8, 16 or 32*/
460 LV_COLOR_SET_R(ret, LV_UDIV255((uint16_t)LV_COLOR_GET_R(c1) * mix + LV_COLOR_GET_R(c2) *
461 (255 - mix) + LV_COLOR_MIX_ROUND_OFS));
462 LV_COLOR_SET_G(ret, LV_UDIV255((uint16_t)LV_COLOR_GET_G(c1) * mix + LV_COLOR_GET_G(c2) *
463 (255 - mix) + LV_COLOR_MIX_ROUND_OFS));
464 LV_COLOR_SET_B(ret, LV_UDIV255((uint16_t)LV_COLOR_GET_B(c1) * mix + LV_COLOR_GET_B(c2) *
465 (255 - mix) + LV_COLOR_MIX_ROUND_OFS));
466 LV_COLOR_SET_A(ret, 0xFF);
467 #else
468 /*LV_COLOR_DEPTH == 1*/
469 ret.full = mix > LV_OPA_50 ? c1.full : c2.full;
470 #endif
471
472 return ret;
473 }
474
lv_color_premult(lv_color_t c,uint8_t mix,uint16_t * out)475 LV_ATTRIBUTE_FAST_MEM static inline void lv_color_premult(lv_color_t c, uint8_t mix, uint16_t * out)
476 {
477 #if LV_COLOR_DEPTH != 1
478 out[0] = (uint16_t)LV_COLOR_GET_R(c) * mix;
479 out[1] = (uint16_t)LV_COLOR_GET_G(c) * mix;
480 out[2] = (uint16_t)LV_COLOR_GET_B(c) * mix;
481 #else
482 (void) mix;
483 /*Pre-multiplication can't be used with 1 bpp*/
484 out[0] = LV_COLOR_GET_R(c);
485 out[1] = LV_COLOR_GET_G(c);
486 out[2] = LV_COLOR_GET_B(c);
487 #endif
488
489 }
490
491 /**
492 * Mix two colors with a given ratio. It runs faster then `lv_color_mix` but requires some pre computation.
493 * @param premult_c1 The first color. Should be preprocessed with `lv_color_premult(c1)`
494 * @param c2 The second color. As it is no pre computation required on it
495 * @param mix The ratio of the colors. 0: full `c1`, 255: full `c2`, 127: half `c1` and half `c2`.
496 * Should be modified like mix = `255 - mix`
497 * @return the mixed color
498 * @note 255 won't give clearly `c1`.
499 */
lv_color_mix_premult(uint16_t * premult_c1,lv_color_t c2,uint8_t mix)500 LV_ATTRIBUTE_FAST_MEM static inline lv_color_t lv_color_mix_premult(uint16_t * premult_c1, lv_color_t c2, uint8_t mix)
501 {
502 lv_color_t ret;
503 #if LV_COLOR_DEPTH != 1
504 /*LV_COLOR_DEPTH == 8 or 32*/
505 LV_COLOR_SET_R(ret, LV_UDIV255(premult_c1[0] + LV_COLOR_GET_R(c2) * mix + LV_COLOR_MIX_ROUND_OFS));
506 LV_COLOR_SET_G(ret, LV_UDIV255(premult_c1[1] + LV_COLOR_GET_G(c2) * mix + LV_COLOR_MIX_ROUND_OFS));
507 LV_COLOR_SET_B(ret, LV_UDIV255(premult_c1[2] + LV_COLOR_GET_B(c2) * mix + LV_COLOR_MIX_ROUND_OFS));
508 LV_COLOR_SET_A(ret, 0xFF);
509 #else
510 /*LV_COLOR_DEPTH == 1*/
511 /*Restore color1*/
512 lv_color_t c1;
513 LV_COLOR_SET_R(c1, premult_c1[0]);
514 LV_COLOR_SET_G(c1, premult_c1[1]);
515 LV_COLOR_SET_B(c1, premult_c1[2]);
516 ret.full = mix > LV_OPA_50 ? c2.full : c1.full;
517 #endif
518
519 return ret;
520 }
521
522 /**
523 * Mix two colors. Both color can have alpha value.
524 * @param bg_color background color
525 * @param bg_opa alpha of the background color
526 * @param fg_color foreground color
527 * @param fg_opa alpha of the foreground color
528 * @param res_color the result color
529 * @param res_opa the result opacity
530 */
lv_color_mix_with_alpha(lv_color_t bg_color,lv_opa_t bg_opa,lv_color_t fg_color,lv_opa_t fg_opa,lv_color_t * res_color,lv_opa_t * res_opa)531 LV_ATTRIBUTE_FAST_MEM static inline void lv_color_mix_with_alpha(lv_color_t bg_color, lv_opa_t bg_opa,
532 lv_color_t fg_color, lv_opa_t fg_opa,
533 lv_color_t * res_color, lv_opa_t * res_opa)
534 {
535 /*Pick the foreground if it's fully opaque or the Background is fully transparent*/
536 if(fg_opa >= LV_OPA_MAX || bg_opa <= LV_OPA_MIN) {
537 res_color->full = fg_color.full;
538 *res_opa = fg_opa;
539 }
540 /*Transparent foreground: use the Background*/
541 else if(fg_opa <= LV_OPA_MIN) {
542 res_color->full = bg_color.full;
543 *res_opa = bg_opa;
544 }
545 /*Opaque background: use simple mix*/
546 else if(bg_opa >= LV_OPA_MAX) {
547 *res_color = lv_color_mix(fg_color, bg_color, fg_opa);
548 *res_opa = LV_OPA_COVER;
549 }
550 /*Both colors have alpha. Expensive calculation need to be applied*/
551 else {
552 /*Save the parameters and the result. If they will be asked again don't compute again*/
553 static lv_opa_t fg_opa_save = 0;
554 static lv_opa_t bg_opa_save = 0;
555 static lv_color_t fg_color_save = _LV_COLOR_ZERO_INITIALIZER;
556 static lv_color_t bg_color_save = _LV_COLOR_ZERO_INITIALIZER;
557 static lv_color_t res_color_saved = _LV_COLOR_ZERO_INITIALIZER;
558 static lv_opa_t res_opa_saved = 0;
559
560 if(fg_opa != fg_opa_save || bg_opa != bg_opa_save || fg_color.full != fg_color_save.full ||
561 bg_color.full != bg_color_save.full) {
562 fg_opa_save = fg_opa;
563 bg_opa_save = bg_opa;
564 fg_color_save.full = fg_color.full;
565 bg_color_save.full = bg_color.full;
566 /*Info:
567 * https://en.wikipedia.org/wiki/Alpha_compositing#Analytical_derivation_of_the_over_operator*/
568 res_opa_saved = 255 - ((uint16_t)((uint16_t)(255 - fg_opa) * (255 - bg_opa)) >> 8);
569 LV_ASSERT(res_opa_saved != 0);
570 lv_opa_t ratio = (uint16_t)((uint16_t)fg_opa * 255) / res_opa_saved;
571 res_color_saved = lv_color_mix(fg_color, bg_color, ratio);
572
573 }
574
575 res_color->full = res_color_saved.full;
576 *res_opa = res_opa_saved;
577 }
578 }
579
580 //! @endcond
581
582 /**
583 * Get the brightness of a color
584 * @param color a color
585 * @return the brightness [0..255]
586 */
lv_color_brightness(lv_color_t color)587 static inline uint8_t lv_color_brightness(lv_color_t color)
588 {
589 lv_color32_t c32;
590 c32.full = lv_color_to32(color);
591 uint16_t bright = (uint16_t)(3u * LV_COLOR_GET_R32(c32) + LV_COLOR_GET_B32(c32) + 4u * LV_COLOR_GET_G32(c32));
592 return (uint8_t)(bright >> 3);
593 }
594
lv_color_make(uint8_t r,uint8_t g,uint8_t b)595 static inline lv_color_t lv_color_make(uint8_t r, uint8_t g, uint8_t b)
596 {
597 return _LV_COLOR_MAKE_TYPE_HELPER LV_COLOR_MAKE(r, g, b);
598 }
599
lv_color_hex(uint32_t c)600 static inline lv_color_t lv_color_hex(uint32_t c)
601 {
602 #if LV_COLOR_DEPTH == 16
603 lv_color_t r;
604 #if LV_COLOR_16_SWAP == 0
605 /* Convert a 4 bytes per pixel in format ARGB32 to R5G6B5 format
606 naive way (by calling lv_color_make with components):
607 r = ((c & 0xFF0000) >> 19)
608 g = ((c & 0xFF00) >> 10)
609 b = ((c & 0xFF) >> 3)
610 rgb565 = (r << 11) | (g << 5) | b
611 That's 3 mask, 5 bitshift and 2 or operations
612
613 A bit better:
614 r = ((c & 0xF80000) >> 8)
615 g = ((c & 0xFC00) >> 5)
616 b = ((c & 0xFF) >> 3)
617 rgb565 = r | g | b
618 That's 3 mask, 3 bitshifts and 2 or operations */
619 r.full = (uint16_t)(((c & 0xF80000) >> 8) | ((c & 0xFC00) >> 5) | ((c & 0xFF) >> 3));
620 #else
621 /* We want: rrrr rrrr GGGg gggg bbbb bbbb => gggb bbbb rrrr rGGG */
622 r.full = (uint16_t)(((c & 0xF80000) >> 16) | ((c & 0xFC00) >> 13) | ((c & 0x1C00) << 3) | ((c & 0xF8) << 5));
623 #endif
624 return r;
625 #elif LV_COLOR_DEPTH == 32
626 lv_color_t r;
627 r.full = c | 0xFF000000;
628 return r;
629 #else /*LV_COLOR_DEPTH == 8*/
630 return lv_color_make((uint8_t)((c >> 16) & 0xFF), (uint8_t)((c >> 8) & 0xFF), (uint8_t)(c & 0xFF));
631 #endif
632 }
633
lv_color_hex3(uint32_t c)634 static inline lv_color_t lv_color_hex3(uint32_t c)
635 {
636 return lv_color_make((uint8_t)(((c >> 4) & 0xF0) | ((c >> 8) & 0xF)), (uint8_t)((c & 0xF0) | ((c & 0xF0) >> 4)),
637 (uint8_t)((c & 0xF) | ((c & 0xF) << 4)));
638 }
639
lv_color_filter_dsc_init(lv_color_filter_dsc_t * dsc,lv_color_filter_cb_t cb)640 static inline void lv_color_filter_dsc_init(lv_color_filter_dsc_t * dsc, lv_color_filter_cb_t cb)
641 {
642 dsc->filter_cb = cb;
643 }
644
645 //! @cond Doxygen_Suppress
646 //!
647 LV_ATTRIBUTE_FAST_MEM void lv_color_fill(lv_color_t * buf, lv_color_t color, uint32_t px_num);
648
649 //! @endcond
650 lv_color_t lv_color_lighten(lv_color_t c, lv_opa_t lvl);
651
652 lv_color_t lv_color_darken(lv_color_t c, lv_opa_t lvl);
653
654 lv_color_t lv_color_change_lightness(lv_color_t c, lv_opa_t lvl);
655
656 /**
657 * Convert a HSV color to RGB
658 * @param h hue [0..359]
659 * @param s saturation [0..100]
660 * @param v value [0..100]
661 * @return the given RGB color in RGB (with LV_COLOR_DEPTH depth)
662 */
663 lv_color_t lv_color_hsv_to_rgb(uint16_t h, uint8_t s, uint8_t v);
664
665 /**
666 * Convert a 32-bit RGB color to HSV
667 * @param r8 8-bit red
668 * @param g8 8-bit green
669 * @param b8 8-bit blue
670 * @return the given RGB color in HSV
671 */
672 lv_color_hsv_t lv_color_rgb_to_hsv(uint8_t r8, uint8_t g8, uint8_t b8);
673
674 /**
675 * Convert a color to HSV
676 * @param color color
677 * @return the given color in HSV
678 */
679 lv_color_hsv_t lv_color_to_hsv(lv_color_t color);
680
681 /**
682 * Just a wrapper around LV_COLOR_CHROMA_KEY because it might be more convenient to use a function in some cases
683 * @return LV_COLOR_CHROMA_KEY
684 */
lv_color_chroma_key(void)685 static inline lv_color_t lv_color_chroma_key(void)
686 {
687 return LV_COLOR_CHROMA_KEY;
688 }
689
690 /**********************
691 * PREDEFINED COLORS
692 **********************/
693 /*Source: https://vuetifyjs.com/en/styles/colors/#material-colors*/
694
695 lv_color_t lv_palette_main(lv_palette_t p);
lv_color_white(void)696 static inline lv_color_t lv_color_white(void)
697 {
698 return lv_color_make(0xff, 0xff, 0xff);
699 }
lv_color_black(void)700 static inline lv_color_t lv_color_black(void)
701 {
702 return lv_color_make(0x00, 0x0, 0x00);
703 }
704 lv_color_t lv_palette_lighten(lv_palette_t p, uint8_t lvl);
705 lv_color_t lv_palette_darken(lv_palette_t p, uint8_t lvl);
706
707 /**********************
708 * MACROS
709 **********************/
710
711 #ifdef __cplusplus
712 } /*extern "C"*/
713 #endif
714
715 #endif /*LV_COLOR_H*/
716
