Mercurial > repos > blastem
comparison nuklear_ui/nuklear_rawfb.h @ 1842:49f65d240299 mame_interp
Merge from default
author | Michael Pavone <pavone@retrodev.com> |
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date | Sun, 14 Apr 2019 23:38:02 -0700 |
parents | 56a1171e29b9 |
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1787:0c6d07f91346 | 1842:49f65d240299 |
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1 /* | |
2 * MIT License | |
3 * | |
4 * Copyright (c) 2016-2017 Patrick Rudolph <siro@das-labor.org> | |
5 * | |
6 * Permission is hereby granted, free of charge, to any person obtaining a copy | |
7 * of this software and associated documentation files (the "Software"), to deal | |
8 * in the Software without restriction, including without limitation the rights | |
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 * copies of the Software, and to permit persons to whom the Software is | |
11 * furnished to do so, subject to the following conditions: | |
12 | |
13 * The above copyright notice and this permission notice shall be included in all | |
14 * copies or substantial portions of the Software. | |
15 | |
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
22 * SOFTWARE. | |
23 */ | |
24 /* | |
25 * ============================================================== | |
26 * | |
27 * API | |
28 * | |
29 * =============================================================== | |
30 */ | |
31 #ifndef NK_RAWFB_H_ | |
32 #define NK_RAWFB_H_ | |
33 | |
34 struct rawfb_context; | |
35 | |
36 /* All functions are thread-safe */ | |
37 NK_API struct rawfb_context *nk_rawfb_init(void *fb, struct nk_context *context, const unsigned int w, const unsigned int h, const unsigned int pitch); | |
38 NK_API void nk_rawfb_render(const struct rawfb_context *rawfb, const struct nk_color clear, const unsigned char enable_clear); | |
39 NK_API void nk_rawfb_shutdown(struct rawfb_context *rawfb); | |
40 NK_API void nk_rawfb_resize_fb(struct rawfb_context *rawfb, void *fb, const unsigned int w, const unsigned int h, const unsigned int pitch); | |
41 | |
42 #endif | |
43 /* | |
44 * ============================================================== | |
45 * | |
46 * IMPLEMENTATION | |
47 * | |
48 * =============================================================== | |
49 */ | |
50 #ifdef NK_RAWFB_IMPLEMENTATION | |
51 | |
52 struct rawfb_image { | |
53 void *pixels; | |
54 int w, h, pitch; | |
55 enum nk_font_atlas_format format; | |
56 }; | |
57 struct rawfb_context { | |
58 struct nk_context *ctx; | |
59 struct nk_rect scissors; | |
60 struct rawfb_image fb; | |
61 struct rawfb_image font_tex; | |
62 struct nk_font_atlas atlas; | |
63 }; | |
64 | |
65 #ifndef MIN | |
66 #define MIN(a,b) ((a) < (b) ? (a) : (b)) | |
67 #endif | |
68 #ifndef MAX | |
69 #define MAX(a,b) ((a) < (b) ? (b) : (a)) | |
70 #endif | |
71 | |
72 static unsigned int | |
73 nk_color_from_byte(const nk_byte *c) | |
74 { | |
75 unsigned int res = 0; | |
76 #if defined(RAWFB_RGBX_8888) | |
77 res |= (unsigned int)c[0] << 16; | |
78 res |= (unsigned int)c[1] << 8; | |
79 res |= (unsigned int)c[2] << 0; | |
80 #elif defined(RAWFB_XRGB_8888) | |
81 res = ((unsigned int *)c)[0]; | |
82 #else | |
83 #error Define one of RAWFB_RGBX_8888 , RAWFB_XRGB_8888 | |
84 #endif | |
85 return (res); | |
86 } | |
87 | |
88 static void | |
89 nk_rawfb_setpixel(const struct rawfb_context *rawfb, | |
90 const short x0, const short y0, const struct nk_color col) | |
91 { | |
92 unsigned int c = nk_color_from_byte(&col.r); | |
93 unsigned char *pixels = rawfb->fb.pixels; | |
94 unsigned int *ptr; | |
95 | |
96 pixels += y0 * rawfb->fb.pitch; | |
97 ptr = (unsigned int *)pixels; | |
98 ptr += x0; | |
99 | |
100 if (y0 < rawfb->scissors.h && y0 >= rawfb->scissors.y && | |
101 x0 >= rawfb->scissors.x && x0 < rawfb->scissors.w) | |
102 *ptr = c; | |
103 } | |
104 | |
105 static void | |
106 nk_rawfb_line_horizontal(const struct rawfb_context *rawfb, | |
107 const short x0, const short y, const short x1, const struct nk_color col) | |
108 { | |
109 /* This function is called the most. Try to optimize it a bit... | |
110 * It does not check for scissors or image borders. | |
111 * The caller has to make sure it does no exceed bounds. */ | |
112 unsigned int i, n; | |
113 unsigned int c[16]; | |
114 unsigned char *pixels = rawfb->fb.pixels; | |
115 unsigned int *ptr; | |
116 | |
117 pixels += y * rawfb->fb.pitch; | |
118 ptr = (unsigned int *)pixels; | |
119 ptr += x0; | |
120 | |
121 n = x1 - x0; | |
122 for (i = 0; i < sizeof(c) / sizeof(c[0]); i++) | |
123 c[i] = nk_color_from_byte(&col.r); | |
124 | |
125 while (n > 16) { | |
126 memcpy((void *)ptr, c, sizeof(c)); | |
127 n -= 16; ptr += 16; | |
128 } for (i = 0; i < n; i++) | |
129 ptr[i] = c[i]; | |
130 } | |
131 | |
132 static void | |
133 nk_rawfb_imagesetpixel(const struct rawfb_image *img, | |
134 const int x0, const int y0, const struct nk_color col) | |
135 { | |
136 unsigned char *ptr; | |
137 NK_ASSERT(img); | |
138 if (y0 < img->h && y0 > 0 && x0 > 0 && x0 < img->w) { | |
139 ptr = img->pixels; | |
140 if (img->format == NK_FONT_ATLAS_ALPHA8) { | |
141 ptr += img->pitch * y0; | |
142 ptr[x0] = col.a; | |
143 } else { | |
144 ptr += img->pitch * y0; | |
145 ((struct nk_color *)ptr)[x0] = col; | |
146 } | |
147 } | |
148 } | |
149 | |
150 static struct nk_color | |
151 nk_image_getpixel(const struct rawfb_image *img, const int x0, const int y0) | |
152 { | |
153 struct nk_color col = {0, 0, 0, 0}; | |
154 unsigned char *ptr; | |
155 NK_ASSERT(img); | |
156 if (y0 < img->h && y0 > 0 && x0 > 0 && x0 < img->w) { | |
157 ptr = img->pixels; | |
158 if (img->format == NK_FONT_ATLAS_ALPHA8) { | |
159 ptr += img->pitch * y0; | |
160 col.a = ptr[x0]; | |
161 col.b = col.g = col.r = 0xff; | |
162 } else { | |
163 ptr += img->pitch * y0; | |
164 col = ((struct nk_color *)ptr)[x0]; | |
165 } | |
166 } return col; | |
167 } | |
168 | |
169 static void | |
170 nk_image_blendpixel(const struct rawfb_image *img, | |
171 const int x0, const int y0, struct nk_color col) | |
172 { | |
173 struct nk_color col2; | |
174 unsigned char inv_a; | |
175 if (col.a == 0) | |
176 return; | |
177 | |
178 inv_a = 0xff - col.a; | |
179 col2 = nk_image_getpixel(img, x0, y0); | |
180 col.r = (col.r * col.a + col2.r * inv_a) >> 8; | |
181 col.g = (col.g * col.a + col2.g * inv_a) >> 8; | |
182 col.b = (col.b * col.a + col2.b * inv_a) >> 8; | |
183 nk_rawfb_imagesetpixel(img, x0, y0, col); | |
184 } | |
185 | |
186 static void | |
187 nk_rawfb_scissor(struct rawfb_context *rawfb, | |
188 const float x, | |
189 const float y, | |
190 const float w, | |
191 const float h) | |
192 { | |
193 rawfb->scissors.x = MIN(MAX(x, 0), rawfb->fb.w); | |
194 rawfb->scissors.y = MIN(MAX(y, 0), rawfb->fb.h); | |
195 rawfb->scissors.w = MIN(MAX(w + x, 0), rawfb->fb.w); | |
196 rawfb->scissors.h = MIN(MAX(h + y, 0), rawfb->fb.h); | |
197 } | |
198 | |
199 static void | |
200 nk_rawfb_stroke_line(const struct rawfb_context *rawfb, | |
201 short x0, short y0, short x1, short y1, | |
202 const unsigned int line_thickness, const struct nk_color col) | |
203 { | |
204 short tmp; | |
205 int dy, dx, stepx, stepy; | |
206 | |
207 dy = y1 - y0; | |
208 dx = x1 - x0; | |
209 | |
210 /* fast path */ | |
211 if (dy == 0) { | |
212 if (dx == 0 || y0 >= rawfb->scissors.h || y0 < rawfb->scissors.y) | |
213 return; | |
214 | |
215 if (dx < 0) { | |
216 /* swap x0 and x1 */ | |
217 tmp = x1; | |
218 x1 = x0; | |
219 x0 = tmp; | |
220 } | |
221 x1 = MIN(rawfb->scissors.w - 1, x1); | |
222 x0 = MIN(rawfb->scissors.w - 1, x0); | |
223 x1 = MAX(rawfb->scissors.x, x1); | |
224 x0 = MAX(rawfb->scissors.x, x0); | |
225 nk_rawfb_line_horizontal(rawfb, x0, y0, x1, col); | |
226 return; | |
227 } | |
228 if (dy < 0) { | |
229 dy = -dy; | |
230 stepy = -1; | |
231 } else stepy = 1; | |
232 | |
233 if (dx < 0) { | |
234 dx = -dx; | |
235 stepx = -1; | |
236 } else stepx = 1; | |
237 | |
238 dy <<= 1; | |
239 dx <<= 1; | |
240 | |
241 nk_rawfb_setpixel(rawfb, x0, y0, col); | |
242 if (dx > dy) { | |
243 int fraction = dy - (dx >> 1); | |
244 while (x0 != x1) { | |
245 if (fraction >= 0) { | |
246 y0 += stepy; | |
247 fraction -= dx; | |
248 } | |
249 x0 += stepx; | |
250 fraction += dy; | |
251 nk_rawfb_setpixel(rawfb, x0, y0, col); | |
252 } | |
253 } else { | |
254 int fraction = dx - (dy >> 1); | |
255 while (y0 != y1) { | |
256 if (fraction >= 0) { | |
257 x0 += stepx; | |
258 fraction -= dy; | |
259 } | |
260 y0 += stepy; | |
261 fraction += dx; | |
262 nk_rawfb_setpixel(rawfb, x0, y0, col); | |
263 } | |
264 } | |
265 } | |
266 | |
267 static void | |
268 nk_rawfb_fill_polygon(const struct rawfb_context *rawfb, | |
269 const struct nk_vec2i *pnts, int count, const struct nk_color col) | |
270 { | |
271 int i = 0; | |
272 #define MAX_POINTS 64 | |
273 int left = 10000, top = 10000, bottom = 0, right = 0; | |
274 int nodes, nodeX[MAX_POINTS], pixelX, pixelY, j, swap ; | |
275 | |
276 if (count == 0) return; | |
277 if (count > MAX_POINTS) | |
278 count = MAX_POINTS; | |
279 | |
280 /* Get polygon dimensions */ | |
281 for (i = 0; i < count; i++) { | |
282 if (left > pnts[i].x) | |
283 left = pnts[i].x; | |
284 if (right < pnts[i].x) | |
285 right = pnts[i].x; | |
286 if (top > pnts[i].y) | |
287 top = pnts[i].y; | |
288 if (bottom < pnts[i].y) | |
289 bottom = pnts[i].y; | |
290 } bottom++; right++; | |
291 | |
292 /* Polygon scanline algorithm released under public-domain by Darel Rex Finley, 2007 */ | |
293 /* Loop through the rows of the image. */ | |
294 for (pixelY = top; pixelY < bottom; pixelY ++) { | |
295 nodes = 0; /* Build a list of nodes. */ | |
296 j = count - 1; | |
297 for (i = 0; i < count; i++) { | |
298 if (((pnts[i].y < pixelY) && (pnts[j].y >= pixelY)) || | |
299 ((pnts[j].y < pixelY) && (pnts[i].y >= pixelY))) { | |
300 nodeX[nodes++]= (int)((float)pnts[i].x | |
301 + ((float)pixelY - (float)pnts[i].y) / ((float)pnts[j].y - (float)pnts[i].y) | |
302 * ((float)pnts[j].x - (float)pnts[i].x)); | |
303 } j = i; | |
304 } | |
305 | |
306 /* Sort the nodes, via a simple “Bubble” sort. */ | |
307 i = 0; | |
308 while (i < nodes - 1) { | |
309 if (nodeX[i] > nodeX[i+1]) { | |
310 swap = nodeX[i]; | |
311 nodeX[i] = nodeX[i+1]; | |
312 nodeX[i+1] = swap; | |
313 if (i) i--; | |
314 } else i++; | |
315 } | |
316 /* Fill the pixels between node pairs. */ | |
317 for (i = 0; i < nodes; i += 2) { | |
318 if (nodeX[i+0] >= right) break; | |
319 if (nodeX[i+1] > left) { | |
320 if (nodeX[i+0] < left) nodeX[i+0] = left ; | |
321 if (nodeX[i+1] > right) nodeX[i+1] = right; | |
322 for (pixelX = nodeX[i]; pixelX < nodeX[i + 1]; pixelX++) | |
323 nk_rawfb_setpixel(rawfb, pixelX, pixelY, col); | |
324 } | |
325 } | |
326 } | |
327 #undef MAX_POINTS | |
328 } | |
329 | |
330 static void | |
331 nk_rawfb_stroke_arc(const struct rawfb_context *rawfb, | |
332 short x0, short y0, short w, short h, const short s, | |
333 const short line_thickness, const struct nk_color col) | |
334 { | |
335 /* Bresenham's ellipses - modified to draw one quarter */ | |
336 const int a2 = (w * w) / 4; | |
337 const int b2 = (h * h) / 4; | |
338 const int fa2 = 4 * a2, fb2 = 4 * b2; | |
339 int x, y, sigma; | |
340 | |
341 if (s != 0 && s != 90 && s != 180 && s != 270) return; | |
342 if (w < 1 || h < 1) return; | |
343 | |
344 /* Convert upper left to center */ | |
345 h = (h + 1) / 2; | |
346 w = (w + 1) / 2; | |
347 x0 += w; y0 += h; | |
348 | |
349 /* First half */ | |
350 for (x = 0, y = h, sigma = 2*b2+a2*(1-2*h); b2*x <= a2*y; x++) { | |
351 if (s == 180) | |
352 nk_rawfb_setpixel(rawfb, x0 + x, y0 + y, col); | |
353 else if (s == 270) | |
354 nk_rawfb_setpixel(rawfb, x0 - x, y0 + y, col); | |
355 else if (s == 0) | |
356 nk_rawfb_setpixel(rawfb, x0 + x, y0 - y, col); | |
357 else if (s == 90) | |
358 nk_rawfb_setpixel(rawfb, x0 - x, y0 - y, col); | |
359 if (sigma >= 0) { | |
360 sigma += fa2 * (1 - y); | |
361 y--; | |
362 } sigma += b2 * ((4 * x) + 6); | |
363 } | |
364 | |
365 /* Second half */ | |
366 for (x = w, y = 0, sigma = 2*a2+b2*(1-2*w); a2*y <= b2*x; y++) { | |
367 if (s == 180) | |
368 nk_rawfb_setpixel(rawfb, x0 + x, y0 + y, col); | |
369 else if (s == 270) | |
370 nk_rawfb_setpixel(rawfb, x0 - x, y0 + y, col); | |
371 else if (s == 0) | |
372 nk_rawfb_setpixel(rawfb, x0 + x, y0 - y, col); | |
373 else if (s == 90) | |
374 nk_rawfb_setpixel(rawfb, x0 - x, y0 - y, col); | |
375 if (sigma >= 0) { | |
376 sigma += fb2 * (1 - x); | |
377 x--; | |
378 } sigma += a2 * ((4 * y) + 6); | |
379 } | |
380 } | |
381 | |
382 static void | |
383 nk_rawfb_fill_arc(const struct rawfb_context *rawfb, short x0, short y0, | |
384 short w, short h, const short s, const struct nk_color col) | |
385 { | |
386 /* Bresenham's ellipses - modified to fill one quarter */ | |
387 const int a2 = (w * w) / 4; | |
388 const int b2 = (h * h) / 4; | |
389 const int fa2 = 4 * a2, fb2 = 4 * b2; | |
390 int x, y, sigma; | |
391 struct nk_vec2i pnts[3]; | |
392 if (w < 1 || h < 1) return; | |
393 if (s != 0 && s != 90 && s != 180 && s != 270) | |
394 return; | |
395 | |
396 /* Convert upper left to center */ | |
397 h = (h + 1) / 2; | |
398 w = (w + 1) / 2; | |
399 x0 += w; | |
400 y0 += h; | |
401 | |
402 pnts[0].x = x0; | |
403 pnts[0].y = y0; | |
404 pnts[2].x = x0; | |
405 pnts[2].y = y0; | |
406 | |
407 /* First half */ | |
408 for (x = 0, y = h, sigma = 2*b2+a2*(1-2*h); b2*x <= a2*y; x++) { | |
409 if (s == 180) { | |
410 pnts[1].x = x0 + x; pnts[1].y = y0 + y; | |
411 } else if (s == 270) { | |
412 pnts[1].x = x0 - x; pnts[1].y = y0 + y; | |
413 } else if (s == 0) { | |
414 pnts[1].x = x0 + x; pnts[1].y = y0 - y; | |
415 } else if (s == 90) { | |
416 pnts[1].x = x0 - x; pnts[1].y = y0 - y; | |
417 } | |
418 nk_rawfb_fill_polygon(rawfb, pnts, 3, col); | |
419 pnts[2] = pnts[1]; | |
420 if (sigma >= 0) { | |
421 sigma += fa2 * (1 - y); | |
422 y--; | |
423 } sigma += b2 * ((4 * x) + 6); | |
424 } | |
425 | |
426 /* Second half */ | |
427 for (x = w, y = 0, sigma = 2*a2+b2*(1-2*w); a2*y <= b2*x; y++) { | |
428 if (s == 180) { | |
429 pnts[1].x = x0 + x; pnts[1].y = y0 + y; | |
430 } else if (s == 270) { | |
431 pnts[1].x = x0 - x; pnts[1].y = y0 + y; | |
432 } else if (s == 0) { | |
433 pnts[1].x = x0 + x; pnts[1].y = y0 - y; | |
434 } else if (s == 90) { | |
435 pnts[1].x = x0 - x; pnts[1].y = y0 - y; | |
436 } | |
437 nk_rawfb_fill_polygon(rawfb, pnts, 3, col); | |
438 pnts[2] = pnts[1]; | |
439 if (sigma >= 0) { | |
440 sigma += fb2 * (1 - x); | |
441 x--; | |
442 } sigma += a2 * ((4 * y) + 6); | |
443 } | |
444 } | |
445 | |
446 static void | |
447 nk_rawfb_stroke_rect(const struct rawfb_context *rawfb, | |
448 const short x, const short y, const short w, const short h, | |
449 const short r, const short line_thickness, const struct nk_color col) | |
450 { | |
451 if (r == 0) { | |
452 nk_rawfb_stroke_line(rawfb, x, y, x + w, y, line_thickness, col); | |
453 nk_rawfb_stroke_line(rawfb, x, y + h, x + w, y + h, line_thickness, col); | |
454 nk_rawfb_stroke_line(rawfb, x, y, x, y + h, line_thickness, col); | |
455 nk_rawfb_stroke_line(rawfb, x + w, y, x + w, y + h, line_thickness, col); | |
456 } else { | |
457 const short xc = x + r; | |
458 const short yc = y + r; | |
459 const short wc = (short)(w - 2 * r); | |
460 const short hc = (short)(h - 2 * r); | |
461 | |
462 nk_rawfb_stroke_line(rawfb, xc, y, xc + wc, y, line_thickness, col); | |
463 nk_rawfb_stroke_line(rawfb, x + w, yc, x + w, yc + hc, line_thickness, col); | |
464 nk_rawfb_stroke_line(rawfb, xc, y + h, xc + wc, y + h, line_thickness, col); | |
465 nk_rawfb_stroke_line(rawfb, x, yc, x, yc + hc, line_thickness, col); | |
466 | |
467 nk_rawfb_stroke_arc(rawfb, xc + wc - r, y, | |
468 (unsigned)r*2, (unsigned)r*2, 0 , line_thickness, col); | |
469 nk_rawfb_stroke_arc(rawfb, x, y, | |
470 (unsigned)r*2, (unsigned)r*2, 90 , line_thickness, col); | |
471 nk_rawfb_stroke_arc(rawfb, x, yc + hc - r, | |
472 (unsigned)r*2, (unsigned)r*2, 270 , line_thickness, col); | |
473 nk_rawfb_stroke_arc(rawfb, xc + wc - r, yc + hc - r, | |
474 (unsigned)r*2, (unsigned)r*2, 180 , line_thickness, col); | |
475 } | |
476 } | |
477 | |
478 static void | |
479 nk_rawfb_fill_rect(const struct rawfb_context *rawfb, | |
480 const short x, const short y, const short w, const short h, | |
481 const short r, const struct nk_color col) | |
482 { | |
483 int i; | |
484 if (r == 0) { | |
485 for (i = 0; i < h; i++) | |
486 nk_rawfb_stroke_line(rawfb, x, y + i, x + w, y + i, 1, col); | |
487 } else { | |
488 const short xc = x + r; | |
489 const short yc = y + r; | |
490 const short wc = (short)(w - 2 * r); | |
491 const short hc = (short)(h - 2 * r); | |
492 | |
493 struct nk_vec2i pnts[12]; | |
494 pnts[0].x = x; | |
495 pnts[0].y = yc; | |
496 pnts[1].x = xc; | |
497 pnts[1].y = yc; | |
498 pnts[2].x = xc; | |
499 pnts[2].y = y; | |
500 | |
501 pnts[3].x = xc + wc; | |
502 pnts[3].y = y; | |
503 pnts[4].x = xc + wc; | |
504 pnts[4].y = yc; | |
505 pnts[5].x = x + w; | |
506 pnts[5].y = yc; | |
507 | |
508 pnts[6].x = x + w; | |
509 pnts[6].y = yc + hc; | |
510 pnts[7].x = xc + wc; | |
511 pnts[7].y = yc + hc; | |
512 pnts[8].x = xc + wc; | |
513 pnts[8].y = y + h; | |
514 | |
515 pnts[9].x = xc; | |
516 pnts[9].y = y + h; | |
517 pnts[10].x = xc; | |
518 pnts[10].y = yc + hc; | |
519 pnts[11].x = x; | |
520 pnts[11].y = yc + hc; | |
521 | |
522 nk_rawfb_fill_polygon(rawfb, pnts, 12, col); | |
523 | |
524 nk_rawfb_fill_arc(rawfb, xc + wc - r, y, | |
525 (unsigned)r*2, (unsigned)r*2, 0 , col); | |
526 nk_rawfb_fill_arc(rawfb, x, y, | |
527 (unsigned)r*2, (unsigned)r*2, 90 , col); | |
528 nk_rawfb_fill_arc(rawfb, x, yc + hc - r, | |
529 (unsigned)r*2, (unsigned)r*2, 270 , col); | |
530 nk_rawfb_fill_arc(rawfb, xc + wc - r, yc + hc - r, | |
531 (unsigned)r*2, (unsigned)r*2, 180 , col); | |
532 } | |
533 } | |
534 | |
535 static void | |
536 nk_rawfb_fill_triangle(const struct rawfb_context *rawfb, | |
537 const short x0, const short y0, const short x1, const short y1, | |
538 const short x2, const short y2, const struct nk_color col) | |
539 { | |
540 struct nk_vec2i pnts[3]; | |
541 pnts[0].x = x0; | |
542 pnts[0].y = y0; | |
543 pnts[1].x = x1; | |
544 pnts[1].y = y1; | |
545 pnts[2].x = x2; | |
546 pnts[2].y = y2; | |
547 nk_rawfb_fill_polygon(rawfb, pnts, 3, col); | |
548 } | |
549 | |
550 static void | |
551 nk_rawfb_stroke_triangle(const struct rawfb_context *rawfb, | |
552 const short x0, const short y0, const short x1, const short y1, | |
553 const short x2, const short y2, const unsigned short line_thickness, | |
554 const struct nk_color col) | |
555 { | |
556 nk_rawfb_stroke_line(rawfb, x0, y0, x1, y1, line_thickness, col); | |
557 nk_rawfb_stroke_line(rawfb, x1, y1, x2, y2, line_thickness, col); | |
558 nk_rawfb_stroke_line(rawfb, x2, y2, x0, y0, line_thickness, col); | |
559 } | |
560 | |
561 static void | |
562 nk_rawfb_stroke_polygon(const struct rawfb_context *rawfb, | |
563 const struct nk_vec2i *pnts, const int count, | |
564 const unsigned short line_thickness, const struct nk_color col) | |
565 { | |
566 int i; | |
567 for (i = 1; i < count; ++i) | |
568 nk_rawfb_stroke_line(rawfb, pnts[i-1].x, pnts[i-1].y, pnts[i].x, | |
569 pnts[i].y, line_thickness, col); | |
570 nk_rawfb_stroke_line(rawfb, pnts[count-1].x, pnts[count-1].y, | |
571 pnts[0].x, pnts[0].y, line_thickness, col); | |
572 } | |
573 | |
574 static void | |
575 nk_rawfb_stroke_polyline(const struct rawfb_context *rawfb, | |
576 const struct nk_vec2i *pnts, const int count, | |
577 const unsigned short line_thickness, const struct nk_color col) | |
578 { | |
579 int i; | |
580 for (i = 0; i < count-1; ++i) | |
581 nk_rawfb_stroke_line(rawfb, pnts[i].x, pnts[i].y, | |
582 pnts[i+1].x, pnts[i+1].y, line_thickness, col); | |
583 } | |
584 | |
585 static void | |
586 nk_rawfb_fill_circle(const struct rawfb_context *rawfb, | |
587 short x0, short y0, short w, short h, const struct nk_color col) | |
588 { | |
589 /* Bresenham's ellipses */ | |
590 const int a2 = (w * w) / 4; | |
591 const int b2 = (h * h) / 4; | |
592 const int fa2 = 4 * a2, fb2 = 4 * b2; | |
593 int x, y, sigma; | |
594 | |
595 /* Convert upper left to center */ | |
596 h = (h + 1) / 2; | |
597 w = (w + 1) / 2; | |
598 x0 += w; | |
599 y0 += h; | |
600 | |
601 /* First half */ | |
602 for (x = 0, y = h, sigma = 2*b2+a2*(1-2*h); b2*x <= a2*y; x++) { | |
603 nk_rawfb_stroke_line(rawfb, x0 - x, y0 + y, x0 + x, y0 + y, 1, col); | |
604 nk_rawfb_stroke_line(rawfb, x0 - x, y0 - y, x0 + x, y0 - y, 1, col); | |
605 if (sigma >= 0) { | |
606 sigma += fa2 * (1 - y); | |
607 y--; | |
608 } sigma += b2 * ((4 * x) + 6); | |
609 } | |
610 /* Second half */ | |
611 for (x = w, y = 0, sigma = 2*a2+b2*(1-2*w); a2*y <= b2*x; y++) { | |
612 nk_rawfb_stroke_line(rawfb, x0 - x, y0 + y, x0 + x, y0 + y, 1, col); | |
613 nk_rawfb_stroke_line(rawfb, x0 - x, y0 - y, x0 + x, y0 - y, 1, col); | |
614 if (sigma >= 0) { | |
615 sigma += fb2 * (1 - x); | |
616 x--; | |
617 } sigma += a2 * ((4 * y) + 6); | |
618 } | |
619 } | |
620 | |
621 static void | |
622 nk_rawfb_stroke_circle(const struct rawfb_context *rawfb, | |
623 short x0, short y0, short w, short h, const short line_thickness, | |
624 const struct nk_color col) | |
625 { | |
626 /* Bresenham's ellipses */ | |
627 const int a2 = (w * w) / 4; | |
628 const int b2 = (h * h) / 4; | |
629 const int fa2 = 4 * a2, fb2 = 4 * b2; | |
630 int x, y, sigma; | |
631 | |
632 /* Convert upper left to center */ | |
633 h = (h + 1) / 2; | |
634 w = (w + 1) / 2; | |
635 x0 += w; | |
636 y0 += h; | |
637 | |
638 /* First half */ | |
639 for (x = 0, y = h, sigma = 2*b2+a2*(1-2*h); b2*x <= a2*y; x++) { | |
640 nk_rawfb_setpixel(rawfb, x0 + x, y0 + y, col); | |
641 nk_rawfb_setpixel(rawfb, x0 - x, y0 + y, col); | |
642 nk_rawfb_setpixel(rawfb, x0 + x, y0 - y, col); | |
643 nk_rawfb_setpixel(rawfb, x0 - x, y0 - y, col); | |
644 if (sigma >= 0) { | |
645 sigma += fa2 * (1 - y); | |
646 y--; | |
647 } sigma += b2 * ((4 * x) + 6); | |
648 } | |
649 /* Second half */ | |
650 for (x = w, y = 0, sigma = 2*a2+b2*(1-2*w); a2*y <= b2*x; y++) { | |
651 nk_rawfb_setpixel(rawfb, x0 + x, y0 + y, col); | |
652 nk_rawfb_setpixel(rawfb, x0 - x, y0 + y, col); | |
653 nk_rawfb_setpixel(rawfb, x0 + x, y0 - y, col); | |
654 nk_rawfb_setpixel(rawfb, x0 - x, y0 - y, col); | |
655 if (sigma >= 0) { | |
656 sigma += fb2 * (1 - x); | |
657 x--; | |
658 } sigma += a2 * ((4 * y) + 6); | |
659 } | |
660 } | |
661 | |
662 static void | |
663 nk_rawfb_stroke_curve(const struct rawfb_context *rawfb, | |
664 const struct nk_vec2i p1, const struct nk_vec2i p2, | |
665 const struct nk_vec2i p3, const struct nk_vec2i p4, | |
666 const unsigned int num_segments, const unsigned short line_thickness, | |
667 const struct nk_color col) | |
668 { | |
669 unsigned int i_step, segments; | |
670 float t_step; | |
671 struct nk_vec2i last = p1; | |
672 | |
673 segments = MAX(num_segments, 1); | |
674 t_step = 1.0f/(float)segments; | |
675 for (i_step = 1; i_step <= segments; ++i_step) { | |
676 float t = t_step * (float)i_step; | |
677 float u = 1.0f - t; | |
678 float w1 = u*u*u; | |
679 float w2 = 3*u*u*t; | |
680 float w3 = 3*u*t*t; | |
681 float w4 = t * t *t; | |
682 float x = w1 * p1.x + w2 * p2.x + w3 * p3.x + w4 * p4.x; | |
683 float y = w1 * p1.y + w2 * p2.y + w3 * p3.y + w4 * p4.y; | |
684 nk_rawfb_stroke_line(rawfb, last.x, last.y, | |
685 (short)x, (short)y, line_thickness,col); | |
686 last.x = (short)x; last.y = (short)y; | |
687 } | |
688 } | |
689 | |
690 static void | |
691 nk_rawfb_clear(const struct rawfb_context *rawfb, const struct nk_color col) | |
692 { | |
693 nk_rawfb_fill_rect(rawfb, 0, 0, rawfb->fb.w, rawfb->fb.h, 0, col); | |
694 } | |
695 | |
696 NK_API struct rawfb_context* | |
697 nk_rawfb_init(void *fb, struct nk_context *context, const unsigned int w, const unsigned int h, | |
698 const unsigned int pitch) | |
699 { | |
700 struct rawfb_context *rawfb; | |
701 rawfb = malloc(sizeof(struct rawfb_context)); | |
702 if (!rawfb) | |
703 return NULL; | |
704 | |
705 nk_memset(rawfb, 0, sizeof(struct rawfb_context)); | |
706 rawfb->font_tex.format = NK_FONT_ATLAS_ALPHA8; | |
707 rawfb->font_tex.w = rawfb->font_tex.h = 0; | |
708 | |
709 rawfb->fb.pixels = fb; | |
710 rawfb->fb.w= w; | |
711 rawfb->fb.h = h; | |
712 | |
713 #if defined(RAWFB_XRGB_8888) || defined(RAWFB_RGBX_8888) | |
714 rawfb->fb.format = NK_FONT_ATLAS_RGBA32; | |
715 rawfb->fb.pitch = pitch; | |
716 #else | |
717 #error Fixme | |
718 #endif | |
719 | |
720 rawfb->ctx = context; | |
721 nk_rawfb_scissor(rawfb, 0, 0, rawfb->fb.w, rawfb->fb.h); | |
722 | |
723 return rawfb; | |
724 } | |
725 | |
726 NK_API void | |
727 nk_rawfb_font_stash_begin(struct rawfb_context *rawfb, struct nk_font_atlas **atlas) | |
728 { | |
729 nk_font_atlas_init_default(&rawfb->atlas); | |
730 nk_font_atlas_begin(&rawfb->atlas); | |
731 *atlas = &rawfb->atlas; | |
732 } | |
733 | |
734 NK_API void | |
735 nk_rawfb_font_stash_end(struct rawfb_context *rawfb) | |
736 { | |
737 const void *tex; | |
738 tex = nk_font_atlas_bake(&rawfb->atlas, &rawfb->font_tex.w, &rawfb->font_tex.h, rawfb->font_tex.format); | |
739 if (!tex) return; | |
740 | |
741 switch(rawfb->font_tex.format) { | |
742 case NK_FONT_ATLAS_ALPHA8: | |
743 rawfb->font_tex.pitch = rawfb->font_tex.w * 1; | |
744 break; | |
745 case NK_FONT_ATLAS_RGBA32: | |
746 rawfb->font_tex.pitch = rawfb->font_tex.w * 4; | |
747 break; | |
748 }; | |
749 /* Store the font texture in tex scratch memory */ | |
750 rawfb->font_tex.pixels = malloc(rawfb->font_tex.pitch * rawfb->font_tex.h); | |
751 memcpy(rawfb->font_tex.pixels, tex, rawfb->font_tex.pitch * rawfb->font_tex.h); | |
752 nk_font_atlas_end(&rawfb->atlas, nk_handle_ptr(NULL), NULL); | |
753 if (rawfb->atlas.default_font) | |
754 nk_style_set_font(rawfb->ctx, &rawfb->atlas.default_font->handle); | |
755 nk_style_load_all_cursors(rawfb->ctx, rawfb->atlas.cursors); | |
756 } | |
757 | |
758 static void | |
759 nk_rawfb_stretch_image(const struct rawfb_image *dst, | |
760 const struct rawfb_image *src, const struct nk_rect *dst_rect, | |
761 const struct nk_rect *src_rect, const struct nk_rect *dst_scissors) | |
762 { | |
763 short i, j; | |
764 struct nk_color col; | |
765 float xinc = src_rect->w / dst_rect->w; | |
766 float yinc = src_rect->h / dst_rect->h; | |
767 float xoff = src_rect->x, yoff = src_rect->y; | |
768 | |
769 /* Simple nearest filtering rescaling */ | |
770 /* TODO: use bilinear filter */ | |
771 for (j = 0; j < (short)dst_rect->h; j++) { | |
772 for (i = 0; i < (short)dst_rect->w; i++) { | |
773 if (dst_scissors) { | |
774 if (i + (int)(dst_rect->x + 0.5f) < dst_scissors->x || i + (int)(dst_rect->x + 0.5f) >= dst_scissors->w) | |
775 continue; | |
776 if (j + (int)(dst_rect->y + 0.5f) < dst_scissors->y || j + (int)(dst_rect->y + 0.5f) >= dst_scissors->h) | |
777 continue; | |
778 } | |
779 col = nk_image_getpixel(src, (int)xoff, (int) yoff); | |
780 nk_image_blendpixel(dst, i + (int)(dst_rect->x + 0.5f), j + (int)(dst_rect->y + 0.5f), col); | |
781 xoff += xinc; | |
782 } | |
783 xoff = src_rect->x; | |
784 yoff += yinc; | |
785 } | |
786 } | |
787 | |
788 static void | |
789 nk_rawfb_font_query_font_glyph(nk_handle handle, const float height, | |
790 struct nk_user_font_glyph *glyph, const nk_rune codepoint, | |
791 const nk_rune next_codepoint) | |
792 { | |
793 float scale; | |
794 const struct nk_font_glyph *g; | |
795 struct nk_font *font; | |
796 NK_ASSERT(glyph); | |
797 NK_UNUSED(next_codepoint); | |
798 | |
799 font = (struct nk_font*)handle.ptr; | |
800 NK_ASSERT(font); | |
801 NK_ASSERT(font->glyphs); | |
802 if (!font || !glyph) | |
803 return; | |
804 | |
805 scale = height/font->info.height; | |
806 g = nk_font_find_glyph(font, codepoint); | |
807 glyph->width = (g->x1 - g->x0) * scale; | |
808 glyph->height = (g->y1 - g->y0) * scale; | |
809 glyph->offset = nk_vec2(g->x0 * scale, g->y0 * scale); | |
810 glyph->xadvance = (g->xadvance * scale); | |
811 glyph->uv[0] = nk_vec2(g->u0, g->v0); | |
812 glyph->uv[1] = nk_vec2(g->u1, g->v1); | |
813 } | |
814 | |
815 NK_API void | |
816 nk_rawfb_draw_text(const struct rawfb_context *rawfb, | |
817 const struct nk_user_font *font, const struct nk_rect rect, | |
818 const char *text, const int len, const float font_height, | |
819 const struct nk_color fg) | |
820 { | |
821 float x = 0; | |
822 int text_len = 0; | |
823 nk_rune unicode = 0; | |
824 nk_rune next = 0; | |
825 int glyph_len = 0; | |
826 int next_glyph_len = 0; | |
827 struct nk_user_font_glyph g; | |
828 if (!len || !text) return; | |
829 | |
830 x = 0; | |
831 glyph_len = nk_utf_decode(text, &unicode, len); | |
832 if (!glyph_len) return; | |
833 | |
834 /* draw every glyph image */ | |
835 while (text_len < len && glyph_len) { | |
836 struct nk_rect src_rect; | |
837 struct nk_rect dst_rect; | |
838 float char_width = 0; | |
839 if (unicode == NK_UTF_INVALID) break; | |
840 | |
841 /* query currently drawn glyph information */ | |
842 next_glyph_len = nk_utf_decode(text + text_len + glyph_len, &next, (int)len - text_len); | |
843 nk_rawfb_font_query_font_glyph(font->userdata, font_height, &g, unicode, | |
844 (next == NK_UTF_INVALID) ? '\0' : next); | |
845 | |
846 /* calculate and draw glyph drawing rectangle and image */ | |
847 char_width = g.xadvance; | |
848 src_rect.x = g.uv[0].x * rawfb->font_tex.w; | |
849 src_rect.y = g.uv[0].y * rawfb->font_tex.h; | |
850 src_rect.w = g.uv[1].x * rawfb->font_tex.w - g.uv[0].x * rawfb->font_tex.w; | |
851 src_rect.h = g.uv[1].y * rawfb->font_tex.h - g.uv[0].y * rawfb->font_tex.h; | |
852 | |
853 dst_rect.x = x + g.offset.x + rect.x; | |
854 dst_rect.y = g.offset.y + rect.y; | |
855 dst_rect.w = ceilf(g.width); | |
856 dst_rect.h = ceilf(g.height); | |
857 | |
858 /* TODO: account fg */ | |
859 /* Use software rescaling to blit glyph from font_text to framebuffer */ | |
860 nk_rawfb_stretch_image(&rawfb->fb, &rawfb->font_tex, &dst_rect, &src_rect, &rawfb->scissors); | |
861 | |
862 /* offset next glyph */ | |
863 text_len += glyph_len; | |
864 x += char_width; | |
865 glyph_len = next_glyph_len; | |
866 unicode = next; | |
867 } | |
868 } | |
869 | |
870 NK_API void | |
871 nk_rawfb_drawimage(const struct rawfb_context *rawfb, | |
872 const int x, const int y, const int w, const int h, | |
873 const struct nk_image *img, const struct nk_color *col) | |
874 { | |
875 struct nk_rect src_rect; | |
876 struct nk_rect dst_rect; | |
877 | |
878 const struct rawfb_image *rfb_img = img->handle.ptr; | |
879 if (!rfb_img) { | |
880 rfb_img = &rawfb->font_tex; | |
881 } | |
882 | |
883 src_rect.x = img->region[0]; | |
884 src_rect.y = img->region[1]; | |
885 if (nk_image_is_subimage(img)) { | |
886 src_rect.w = img->region[2]; | |
887 src_rect.h = img->region[3]; | |
888 } else { | |
889 src_rect.w = rfb_img->w; | |
890 src_rect.h = rfb_img->h; | |
891 } | |
892 | |
893 dst_rect.x = x; | |
894 dst_rect.y = y; | |
895 dst_rect.w = w; | |
896 dst_rect.h = h; | |
897 nk_rawfb_stretch_image(&rawfb->fb, rfb_img, &dst_rect, &src_rect, &rawfb->scissors); | |
898 } | |
899 | |
900 NK_API void | |
901 nk_rawfb_shutdown(struct rawfb_context *rawfb) | |
902 { | |
903 nk_memset(rawfb, 0, sizeof(struct rawfb_context)); | |
904 free(rawfb); | |
905 } | |
906 | |
907 NK_API void | |
908 nk_rawfb_resize_fb(struct rawfb_context *rawfb, | |
909 void *fb, | |
910 const unsigned int w, | |
911 const unsigned int h, | |
912 const unsigned int pitch) | |
913 { | |
914 rawfb->fb.w = w; | |
915 rawfb->fb.h = h; | |
916 rawfb->fb.pixels = fb; | |
917 rawfb->fb.pitch = pitch; | |
918 } | |
919 | |
920 NK_API void | |
921 nk_rawfb_render(const struct rawfb_context *rawfb, | |
922 const struct nk_color clear, | |
923 const unsigned char enable_clear) | |
924 { | |
925 const struct nk_command *cmd; | |
926 if (enable_clear) | |
927 nk_rawfb_clear(rawfb, clear); | |
928 | |
929 nk_foreach(cmd, rawfb->ctx) { | |
930 switch (cmd->type) { | |
931 case NK_COMMAND_NOP: break; | |
932 case NK_COMMAND_SCISSOR: { | |
933 const struct nk_command_scissor *s =(const struct nk_command_scissor*)cmd; | |
934 nk_rawfb_scissor((struct rawfb_context *)rawfb, s->x, s->y, s->w, s->h); | |
935 } break; | |
936 case NK_COMMAND_LINE: { | |
937 const struct nk_command_line *l = (const struct nk_command_line *)cmd; | |
938 nk_rawfb_stroke_line(rawfb, l->begin.x, l->begin.y, l->end.x, | |
939 l->end.y, l->line_thickness, l->color); | |
940 } break; | |
941 case NK_COMMAND_RECT: { | |
942 const struct nk_command_rect *r = (const struct nk_command_rect *)cmd; | |
943 nk_rawfb_stroke_rect(rawfb, r->x, r->y, r->w, r->h, | |
944 (unsigned short)r->rounding, r->line_thickness, r->color); | |
945 } break; | |
946 case NK_COMMAND_RECT_FILLED: { | |
947 const struct nk_command_rect_filled *r = (const struct nk_command_rect_filled *)cmd; | |
948 nk_rawfb_fill_rect(rawfb, r->x, r->y, r->w, r->h, | |
949 (unsigned short)r->rounding, r->color); | |
950 } break; | |
951 case NK_COMMAND_CIRCLE: { | |
952 const struct nk_command_circle *c = (const struct nk_command_circle *)cmd; | |
953 nk_rawfb_stroke_circle(rawfb, c->x, c->y, c->w, c->h, c->line_thickness, c->color); | |
954 } break; | |
955 case NK_COMMAND_CIRCLE_FILLED: { | |
956 const struct nk_command_circle_filled *c = (const struct nk_command_circle_filled *)cmd; | |
957 nk_rawfb_fill_circle(rawfb, c->x, c->y, c->w, c->h, c->color); | |
958 } break; | |
959 case NK_COMMAND_TRIANGLE: { | |
960 const struct nk_command_triangle*t = (const struct nk_command_triangle*)cmd; | |
961 nk_rawfb_stroke_triangle(rawfb, t->a.x, t->a.y, t->b.x, t->b.y, | |
962 t->c.x, t->c.y, t->line_thickness, t->color); | |
963 } break; | |
964 case NK_COMMAND_TRIANGLE_FILLED: { | |
965 const struct nk_command_triangle_filled *t = (const struct nk_command_triangle_filled *)cmd; | |
966 nk_rawfb_fill_triangle(rawfb, t->a.x, t->a.y, t->b.x, t->b.y, | |
967 t->c.x, t->c.y, t->color); | |
968 } break; | |
969 case NK_COMMAND_POLYGON: { | |
970 const struct nk_command_polygon *p =(const struct nk_command_polygon*)cmd; | |
971 nk_rawfb_stroke_polygon(rawfb, p->points, p->point_count, p->line_thickness,p->color); | |
972 } break; | |
973 case NK_COMMAND_POLYGON_FILLED: { | |
974 const struct nk_command_polygon_filled *p = (const struct nk_command_polygon_filled *)cmd; | |
975 nk_rawfb_fill_polygon(rawfb, p->points, p->point_count, p->color); | |
976 } break; | |
977 case NK_COMMAND_POLYLINE: { | |
978 const struct nk_command_polyline *p = (const struct nk_command_polyline *)cmd; | |
979 nk_rawfb_stroke_polyline(rawfb, p->points, p->point_count, p->line_thickness, p->color); | |
980 } break; | |
981 case NK_COMMAND_TEXT: { | |
982 const struct nk_command_text *t = (const struct nk_command_text*)cmd; | |
983 nk_rawfb_draw_text(rawfb, t->font, nk_rect(t->x, t->y, t->w, t->h), | |
984 t->string, t->length, t->height, t->foreground); | |
985 } break; | |
986 case NK_COMMAND_CURVE: { | |
987 const struct nk_command_curve *q = (const struct nk_command_curve *)cmd; | |
988 nk_rawfb_stroke_curve(rawfb, q->begin, q->ctrl[0], q->ctrl[1], | |
989 q->end, 22, q->line_thickness, q->color); | |
990 } break; | |
991 case NK_COMMAND_RECT_MULTI_COLOR: | |
992 case NK_COMMAND_IMAGE: { | |
993 const struct nk_command_image *q = (const struct nk_command_image *)cmd; | |
994 nk_rawfb_drawimage(rawfb, q->x, q->y, q->w, q->h, &q->img, &q->col); | |
995 } break; | |
996 case NK_COMMAND_ARC: { | |
997 assert(0 && "NK_COMMAND_ARC not implemented\n"); | |
998 } break; | |
999 case NK_COMMAND_ARC_FILLED: { | |
1000 assert(0 && "NK_COMMAND_ARC_FILLED not implemented\n"); | |
1001 } break; | |
1002 default: break; | |
1003 } | |
1004 } nk_clear(rawfb->ctx); | |
1005 } | |
1006 #endif | |
1007 |