CircuitPython

Source code browser

Note: This site will be taken down by the end of the year

  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
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2016 Damien P. George
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include <stdio.h>
#include <string.h>

#include "py/runtime.h"

#if MICROPY_PY_FRAMEBUF

#include "ports/stm32/font_petme128_8x8.h"

typedef struct _mp_obj_framebuf_t {
    mp_obj_base_t base;
    mp_obj_t buf_obj; // need to store this to prevent GC from reclaiming buf
    void *buf;
    uint16_t width, height, stride;
    uint8_t format;
} mp_obj_framebuf_t;

typedef void (*setpixel_t)(const mp_obj_framebuf_t*, int, int, uint32_t);
typedef uint32_t (*getpixel_t)(const mp_obj_framebuf_t*, int, int);
typedef void (*fill_rect_t)(const mp_obj_framebuf_t *, int, int, int, int, uint32_t);

typedef struct _mp_framebuf_p_t {
    setpixel_t setpixel;
    getpixel_t getpixel;
    fill_rect_t fill_rect;
} mp_framebuf_p_t;

// constants for formats
#define FRAMEBUF_MVLSB    (0)
#define FRAMEBUF_RGB565   (1)
#define FRAMEBUF_GS2_HMSB (5)
#define FRAMEBUF_GS4_HMSB (2)
#define FRAMEBUF_GS8      (6)
#define FRAMEBUF_MHLSB    (3)
#define FRAMEBUF_MHMSB    (4)

// Functions for MHLSB and MHMSB

STATIC void mono_horiz_setpixel(const mp_obj_framebuf_t *fb, int x, int y, uint32_t col) {
    size_t index = (x + y * fb->stride) >> 3;
    int offset = fb->format == FRAMEBUF_MHMSB ? x & 0x07 : 7 - (x & 0x07);
    ((uint8_t*)fb->buf)[index] = (((uint8_t*)fb->buf)[index] & ~(0x01 << offset)) | ((col != 0) << offset);
}

STATIC uint32_t mono_horiz_getpixel(const mp_obj_framebuf_t *fb, int x, int y) {
    size_t index = (x + y * fb->stride) >> 3;
    int offset = fb->format == FRAMEBUF_MHMSB ? x & 0x07 : 7 - (x & 0x07);
    return (((uint8_t*)fb->buf)[index] >> (offset)) & 0x01;
}

STATIC void mono_horiz_fill_rect(const mp_obj_framebuf_t *fb, int x, int y, int w, int h, uint32_t col) {
    int reverse = fb->format == FRAMEBUF_MHMSB;
    int advance = fb->stride >> 3;
    while (w--) {
        uint8_t *b = &((uint8_t*)fb->buf)[(x >> 3) + y * advance];
        int offset = reverse ?  x & 7 : 7 - (x & 7);
        for (int hh = h; hh; --hh) {
            *b = (*b & ~(0x01 << offset)) | ((col != 0) << offset);
            b += advance;
        }
        ++x;
    }
}

// Functions for MVLSB format

STATIC void mvlsb_setpixel(const mp_obj_framebuf_t *fb, int x, int y, uint32_t col) {
    size_t index = (y >> 3) * fb->stride + x;
    uint8_t offset = y & 0x07;
    ((uint8_t*)fb->buf)[index] = (((uint8_t*)fb->buf)[index] & ~(0x01 << offset)) | ((col != 0) << offset);
}

STATIC uint32_t mvlsb_getpixel(const mp_obj_framebuf_t *fb, int x, int y) {
    return (((uint8_t*)fb->buf)[(y >> 3) * fb->stride + x] >> (y & 0x07)) & 0x01;
}

STATIC void mvlsb_fill_rect(const mp_obj_framebuf_t *fb, int x, int y, int w, int h, uint32_t col) {
    while (h--) {
        uint8_t *b = &((uint8_t*)fb->buf)[(y >> 3) * fb->stride + x];
        uint8_t offset = y & 0x07;
        for (int ww = w; ww; --ww) {
            *b = (*b & ~(0x01 << offset)) | ((col != 0) << offset);
            ++b;
        }
        ++y;
    }
}

// Functions for RGB565 format

STATIC void rgb565_setpixel(const mp_obj_framebuf_t *fb, int x, int y, uint32_t col) {
    ((uint16_t*)fb->buf)[x + y * fb->stride] = col;
}

STATIC uint32_t rgb565_getpixel(const mp_obj_framebuf_t *fb, int x, int y) {
    return ((uint16_t*)fb->buf)[x + y * fb->stride];
}

STATIC void rgb565_fill_rect(const mp_obj_framebuf_t *fb, int x, int y, int w, int h, uint32_t col) {
    uint16_t *b = &((uint16_t*)fb->buf)[x + y * fb->stride];
    while (h--) {
        for (int ww = w; ww; --ww) {
            *b++ = col;
        }
        b += fb->stride - w;
    }
}

// Functions for GS2_HMSB format

STATIC void gs2_hmsb_setpixel(const mp_obj_framebuf_t *fb, int x, int y, uint32_t col) {
    uint8_t *pixel = &((uint8_t*)fb->buf)[(x + y * fb->stride) >> 2];
    uint8_t shift = (x & 0x3) << 1;
    uint8_t mask = 0x3 << shift;
    uint8_t color = (col & 0x3) << shift;
    *pixel = color | (*pixel & (~mask));
}

STATIC uint32_t gs2_hmsb_getpixel(const mp_obj_framebuf_t *fb, int x, int y) {
    uint8_t pixel = ((uint8_t*)fb->buf)[(x + y * fb->stride) >> 2];
    uint8_t shift = (x & 0x3) << 1;
    return (pixel >> shift) & 0x3;
}

STATIC void gs2_hmsb_fill_rect(const mp_obj_framebuf_t *fb, int x, int y, int w, int h, uint32_t col) {
    for (int xx=x; xx < x+w; xx++) {
        for (int yy=y; yy < y+h; yy++) {
            gs2_hmsb_setpixel(fb, xx, yy, col);
        }
    }
}

// Functions for GS4_HMSB format

STATIC void gs4_hmsb_setpixel(const mp_obj_framebuf_t *fb, int x, int y, uint32_t col) {
    uint8_t *pixel = &((uint8_t*)fb->buf)[(x + y * fb->stride) >> 1];

    if (x % 2) {
        *pixel = ((uint8_t)col & 0x0f) | (*pixel & 0xf0);
    } else {
        *pixel = ((uint8_t)col << 4) | (*pixel & 0x0f);
    }
}

STATIC uint32_t gs4_hmsb_getpixel(const mp_obj_framebuf_t *fb, int x, int y) {
    if (x % 2) {
        return ((uint8_t*)fb->buf)[(x + y * fb->stride) >> 1] & 0x0f;
    }

    return ((uint8_t*)fb->buf)[(x + y * fb->stride) >> 1] >> 4;
}

STATIC void gs4_hmsb_fill_rect(const mp_obj_framebuf_t *fb, int x, int y, int w, int h, uint32_t col) {
    col &= 0x0f;
    uint8_t *pixel_pair = &((uint8_t*)fb->buf)[(x + y * fb->stride) >> 1];
    uint8_t col_shifted_left = col << 4;
    uint8_t col_pixel_pair = col_shifted_left | col;
    int pixel_count_till_next_line = (fb->stride - w) >> 1;
    bool odd_x = (x % 2 == 1);

    while (h--) {
        int ww = w;

        if (odd_x && ww > 0) {
            *pixel_pair = (*pixel_pair & 0xf0) | col;
            pixel_pair++;
            ww--;
        }

        memset(pixel_pair, col_pixel_pair, ww >> 1);
        pixel_pair += ww >> 1;

        if (ww % 2) {
            *pixel_pair = col_shifted_left | (*pixel_pair & 0x0f);
            if (!odd_x) {
                pixel_pair++;
            }
        }

        pixel_pair += pixel_count_till_next_line;
    }
}

// Functions for GS8 format

STATIC void gs8_setpixel(const mp_obj_framebuf_t *fb, int x, int y, uint32_t col) {
    uint8_t *pixel = &((uint8_t*)fb->buf)[(x + y * fb->stride)];
    *pixel = col & 0xff;
}

STATIC uint32_t gs8_getpixel(const mp_obj_framebuf_t *fb, int x, int y) {
    return ((uint8_t*)fb->buf)[(x + y * fb->stride)];
}

STATIC void gs8_fill_rect(const mp_obj_framebuf_t *fb, int x, int y, int w, int h, uint32_t col) {
    uint8_t *pixel = &((uint8_t*)fb->buf)[(x + y * fb->stride)];
    while (h--) {
        memset(pixel, col, w);
        pixel += fb->stride;
    }
}

STATIC mp_framebuf_p_t formats[] = {
    [FRAMEBUF_MVLSB] = {mvlsb_setpixel, mvlsb_getpixel, mvlsb_fill_rect},
    [FRAMEBUF_RGB565] = {rgb565_setpixel, rgb565_getpixel, rgb565_fill_rect},
    [FRAMEBUF_GS2_HMSB] = {gs2_hmsb_setpixel, gs2_hmsb_getpixel, gs2_hmsb_fill_rect},
    [FRAMEBUF_GS4_HMSB] = {gs4_hmsb_setpixel, gs4_hmsb_getpixel, gs4_hmsb_fill_rect},
    [FRAMEBUF_GS8] = {gs8_setpixel, gs8_getpixel, gs8_fill_rect},
    [FRAMEBUF_MHLSB] = {mono_horiz_setpixel, mono_horiz_getpixel, mono_horiz_fill_rect},
    [FRAMEBUF_MHMSB] = {mono_horiz_setpixel, mono_horiz_getpixel, mono_horiz_fill_rect},
};

static inline void setpixel(const mp_obj_framebuf_t *fb, int x, int y, uint32_t col) {
    formats[fb->format].setpixel(fb, x, y, col);
}

static inline uint32_t getpixel(const mp_obj_framebuf_t *fb, int x, int y) {
    return formats[fb->format].getpixel(fb, x, y);
}

STATIC void fill_rect(const mp_obj_framebuf_t *fb, int x, int y, int w, int h, uint32_t col) {
    if (h < 1 || w < 1 || x + w <= 0 || y + h <= 0 || y >= fb->height || x >= fb->width) {
        // No operation needed.
        return;
    }

    // clip to the framebuffer
    int xend = MIN(fb->width, x + w);
    int yend = MIN(fb->height, y + h);
    x = MAX(x, 0);
    y = MAX(y, 0);

    formats[fb->format].fill_rect(fb, x, y, xend - x, yend - y, col);
}

STATIC mp_obj_t framebuf_make_new(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
    mp_arg_check_num(n_args, kw_args, 4, 5, false);

    mp_obj_framebuf_t *o = m_new_obj(mp_obj_framebuf_t);
    o->base.type = type;
    o->buf_obj = args[0];

    mp_buffer_info_t bufinfo;
    mp_get_buffer_raise(args[0], &bufinfo, MP_BUFFER_WRITE);
    o->buf = bufinfo.buf;

    o->width = mp_obj_get_int(args[1]);
    o->height = mp_obj_get_int(args[2]);
    o->format = mp_obj_get_int(args[3]);
    if (n_args >= 5) {
        o->stride = mp_obj_get_int(args[4]);
    } else {
        o->stride = o->width;
    }

    switch (o->format) {
        case FRAMEBUF_MVLSB:
        case FRAMEBUF_RGB565:
            break;
        case FRAMEBUF_MHLSB:
        case FRAMEBUF_MHMSB:
            o->stride = (o->stride + 7) & ~7;
            break;
        case FRAMEBUF_GS2_HMSB:
            o->stride = (o->stride + 3) & ~3;
            break;
        case FRAMEBUF_GS4_HMSB:
            o->stride = (o->stride + 1) & ~1;
            break;
        case FRAMEBUF_GS8:
            break;
        default:
            mp_raise_ValueError(translate("invalid format"));
    }

    return MP_OBJ_FROM_PTR(o);
}

STATIC mp_int_t framebuf_get_buffer(mp_obj_t self_in, mp_buffer_info_t *bufinfo, mp_uint_t flags) {
    (void)flags;
    mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(self_in);
    bufinfo->buf = self->buf;
    bufinfo->len = self->stride * self->height * (self->format == FRAMEBUF_RGB565 ? 2 : 1);
    bufinfo->typecode = 'B'; // view framebuf as bytes
    return 0;
}

STATIC mp_obj_t framebuf_fill(mp_obj_t self_in, mp_obj_t col_in) {
    mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(self_in);
    mp_int_t col = mp_obj_get_int(col_in);
    formats[self->format].fill_rect(self, 0, 0, self->width, self->height, col);
    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(framebuf_fill_obj, framebuf_fill);

STATIC mp_obj_t framebuf_fill_rect(size_t n_args, const mp_obj_t *args) {
    (void)n_args;

    mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(args[0]);
    mp_int_t x = mp_obj_get_int(args[1]);
    mp_int_t y = mp_obj_get_int(args[2]);
    mp_int_t width = mp_obj_get_int(args[3]);
    mp_int_t height = mp_obj_get_int(args[4]);
    mp_int_t col = mp_obj_get_int(args[5]);

    fill_rect(self, x, y, width, height, col);

    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(framebuf_fill_rect_obj, 6, 6, framebuf_fill_rect);

STATIC mp_obj_t framebuf_pixel(size_t n_args, const mp_obj_t *args) {
    mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(args[0]);
    mp_int_t x = mp_obj_get_int(args[1]);
    mp_int_t y = mp_obj_get_int(args[2]);
    if (0 <= x && x < self->width && 0 <= y && y < self->height) {
        if (n_args == 3) {
            // get
            return MP_OBJ_NEW_SMALL_INT(getpixel(self, x, y));
        } else {
            // set
            setpixel(self, x, y, mp_obj_get_int(args[3]));
        }
    }
    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(framebuf_pixel_obj, 3, 4, framebuf_pixel);

STATIC mp_obj_t framebuf_hline(size_t n_args, const mp_obj_t *args) {
    (void)n_args;

    mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(args[0]);
    mp_int_t x = mp_obj_get_int(args[1]);
    mp_int_t y = mp_obj_get_int(args[2]);
    mp_int_t w = mp_obj_get_int(args[3]);
    mp_int_t col = mp_obj_get_int(args[4]);

    fill_rect(self, x, y, w, 1, col);

    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(framebuf_hline_obj, 5, 5, framebuf_hline);

STATIC mp_obj_t framebuf_vline(size_t n_args, const mp_obj_t *args) {
    (void)n_args;

    mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(args[0]);
    mp_int_t x = mp_obj_get_int(args[1]);
    mp_int_t y = mp_obj_get_int(args[2]);
    mp_int_t h = mp_obj_get_int(args[3]);
    mp_int_t col = mp_obj_get_int(args[4]);

    fill_rect(self, x, y, 1, h, col);

    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(framebuf_vline_obj, 5, 5, framebuf_vline);

STATIC mp_obj_t framebuf_rect(size_t n_args, const mp_obj_t *args) {
    (void)n_args;

    mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(args[0]);
    mp_int_t x = mp_obj_get_int(args[1]);
    mp_int_t y = mp_obj_get_int(args[2]);
    mp_int_t w = mp_obj_get_int(args[3]);
    mp_int_t h = mp_obj_get_int(args[4]);
    mp_int_t col = mp_obj_get_int(args[5]);

    fill_rect(self, x, y, w, 1, col);
    fill_rect(self, x, y + h- 1, w, 1, col);
    fill_rect(self, x, y, 1, h, col);
    fill_rect(self, x + w- 1, y, 1, h, col);

    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(framebuf_rect_obj, 6, 6, framebuf_rect);

STATIC mp_obj_t framebuf_line(size_t n_args, const mp_obj_t *args) {
    (void)n_args;

    mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(args[0]);
    mp_int_t x1 = mp_obj_get_int(args[1]);
    mp_int_t y1 = mp_obj_get_int(args[2]);
    mp_int_t x2 = mp_obj_get_int(args[3]);
    mp_int_t y2 = mp_obj_get_int(args[4]);
    mp_int_t col = mp_obj_get_int(args[5]);

    mp_int_t dx = x2 - x1;
    mp_int_t sx;
    if (dx > 0) {
        sx = 1;
    } else {
        dx = -dx;
        sx = -1;
    }

    mp_int_t dy = y2 - y1;
    mp_int_t sy;
    if (dy > 0) {
        sy = 1;
    } else {
        dy = -dy;
        sy = -1;
    }

    bool steep;
    if (dy > dx) {
        mp_int_t temp;
        temp = x1; x1 = y1; y1 = temp;
        temp = dx; dx = dy; dy = temp;
        temp = sx; sx = sy; sy = temp;
        steep = true;
    } else {
        steep = false;
    }

    mp_int_t e = 2 * dy - dx;
    for (mp_int_t i = 0; i < dx; ++i) {
        if (steep) {
            if (0 <= y1 && y1 < self->width && 0 <= x1 && x1 < self->height) {
                setpixel(self, y1, x1, col);
            }
        } else {
            if (0 <= x1 && x1 < self->width && 0 <= y1 && y1 < self->height) {
                setpixel(self, x1, y1, col);
            }
        }
        while (e >= 0) {
            y1 += sy;
            e -= 2 * dx;
        }
        x1 += sx;
        e += 2 * dy;
    }

    if (0 <= x2 && x2 < self->width && 0 <= y2 && y2 < self->height) {
        setpixel(self, x2, y2, col);
    }

    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(framebuf_line_obj, 6, 6, framebuf_line);

STATIC mp_obj_t framebuf_blit(size_t n_args, const mp_obj_t *args) {
    mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(args[0]);
    mp_obj_framebuf_t *source = MP_OBJ_TO_PTR(args[1]);
    mp_int_t x = mp_obj_get_int(args[2]);
    mp_int_t y = mp_obj_get_int(args[3]);
    mp_int_t key = -1;
    if (n_args > 4) {
        key = mp_obj_get_int(args[4]);
    }

    if (
        (x >= self->width) ||
        (y >= self->height) ||
        (-x >= source->width) ||
        (-y >= source->height)
    ) {
        // Out of bounds, no-op.
        return mp_const_none;
    }

    // Clip.
    int x0 = MAX(0, x);
    int y0 = MAX(0, y);
    int x1 = MAX(0, -x);
    int y1 = MAX(0, -y);
    int x0end = MIN(self->width, x + source->width);
    int y0end = MIN(self->height, y + source->height);

    for (; y0 < y0end; ++y0) {
        int cx1 = x1;
        for (int cx0 = x0; cx0 < x0end; ++cx0) {
            uint32_t col = getpixel(source, cx1, y1);
            if (col != (uint32_t)key) {
                setpixel(self, cx0, y0, col);
            }
            ++cx1;
        }
        ++y1;
    }
    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(framebuf_blit_obj, 4, 5, framebuf_blit);

STATIC mp_obj_t framebuf_scroll(mp_obj_t self_in, mp_obj_t xstep_in, mp_obj_t ystep_in) {
    mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(self_in);
    mp_int_t xstep = mp_obj_get_int(xstep_in);
    mp_int_t ystep = mp_obj_get_int(ystep_in);
    int sx, y, xend, yend, dx, dy;
    if (xstep < 0) {
        sx = 0;
        xend = self->width + xstep;
        dx = 1;
    } else {
        sx = self->width - 1;
        xend = xstep - 1;
        dx = -1;
    }
    if (ystep < 0) {
        y = 0;
        yend = self->height + ystep;
        dy = 1;
    } else {
        y = self->height - 1;
        yend = ystep - 1;
        dy = -1;
    }
    for (; y != yend; y += dy) {
        for (int x = sx; x != xend; x += dx) {
            setpixel(self, x, y, getpixel(self, x - xstep, y - ystep));
        }
    }
    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(framebuf_scroll_obj, framebuf_scroll);

STATIC mp_obj_t framebuf_text(size_t n_args, const mp_obj_t *args) {
    // extract arguments
    mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(args[0]);
    const char *str = mp_obj_str_get_str(args[1]);
    mp_int_t x0 = mp_obj_get_int(args[2]);
    mp_int_t y0 = mp_obj_get_int(args[3]);
    mp_int_t col = 1;
    if (n_args >= 5) {
        col = mp_obj_get_int(args[4]);
    }

    // loop over chars
    for (; *str; ++str) {
        // get char and make sure its in range of font
        int chr = *(uint8_t*)str;
        if (chr < 32 || chr > 127) {
            chr = 127;
        }
        // get char data
        const uint8_t *chr_data = &font_petme128_8x8[(chr - 32) * 8];
        // loop over char data
        for (int j = 0; j < 8; j++, x0++) {
            if (0 <= x0 && x0 < self->width) { // clip x
                uint vline_data = chr_data[j]; // each byte is a column of 8 pixels, LSB at top
                for (int y = y0; vline_data; vline_data >>= 1, y++) { // scan over vertical column
                    if (vline_data & 1) { // only draw if pixel set
                        if (0 <= y && y < self->height) { // clip y
                            setpixel(self, x0, y, col);
                        }
                    }
                }
            }
        }
    }
    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(framebuf_text_obj, 4, 5, framebuf_text);

STATIC const mp_rom_map_elem_t framebuf_locals_dict_table[] = {
    { MP_ROM_QSTR(MP_QSTR_fill), MP_ROM_PTR(&framebuf_fill_obj) },
    { MP_ROM_QSTR(MP_QSTR_fill_rect), MP_ROM_PTR(&framebuf_fill_rect_obj) },
    { MP_ROM_QSTR(MP_QSTR_pixel), MP_ROM_PTR(&framebuf_pixel_obj) },
    { MP_ROM_QSTR(MP_QSTR_hline), MP_ROM_PTR(&framebuf_hline_obj) },
    { MP_ROM_QSTR(MP_QSTR_vline), MP_ROM_PTR(&framebuf_vline_obj) },
    { MP_ROM_QSTR(MP_QSTR_rect), MP_ROM_PTR(&framebuf_rect_obj) },
    { MP_ROM_QSTR(MP_QSTR_line), MP_ROM_PTR(&framebuf_line_obj) },
    { MP_ROM_QSTR(MP_QSTR_blit), MP_ROM_PTR(&framebuf_blit_obj) },
    { MP_ROM_QSTR(MP_QSTR_scroll), MP_ROM_PTR(&framebuf_scroll_obj) },
    { MP_ROM_QSTR(MP_QSTR_text), MP_ROM_PTR(&framebuf_text_obj) },
};
STATIC MP_DEFINE_CONST_DICT(framebuf_locals_dict, framebuf_locals_dict_table);

STATIC const mp_obj_type_t mp_type_framebuf = {
    { &mp_type_type },
    .name = MP_QSTR_FrameBuffer,
    .make_new = framebuf_make_new,
    .buffer_p = { .get_buffer = framebuf_get_buffer },
    .locals_dict = (mp_obj_dict_t*)&framebuf_locals_dict,
};

// this factory function is provided for backwards compatibility with old FrameBuffer1 class
STATIC mp_obj_t legacy_framebuffer1(size_t n_args, const mp_obj_t *args) {
    mp_obj_framebuf_t *o = m_new_obj(mp_obj_framebuf_t);
    o->base.type = &mp_type_framebuf;

    mp_buffer_info_t bufinfo;
    mp_get_buffer_raise(args[0], &bufinfo, MP_BUFFER_WRITE);
    o->buf = bufinfo.buf;

    o->width = mp_obj_get_int(args[1]);
    o->height = mp_obj_get_int(args[2]);
    o->format = FRAMEBUF_MVLSB;
    if (n_args >= 4) {
        o->stride = mp_obj_get_int(args[3]);
    } else {
        o->stride = o->width;
    }

    return MP_OBJ_FROM_PTR(o);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(legacy_framebuffer1_obj, 3, 4, legacy_framebuffer1);

STATIC const mp_rom_map_elem_t framebuf_module_globals_table[] = {
    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_framebuf) },
    { MP_ROM_QSTR(MP_QSTR_FrameBuffer), MP_ROM_PTR(&mp_type_framebuf) },
    { MP_ROM_QSTR(MP_QSTR_FrameBuffer1), MP_ROM_PTR(&legacy_framebuffer1_obj) },
    { MP_ROM_QSTR(MP_QSTR_MVLSB), MP_ROM_INT(FRAMEBUF_MVLSB) },
    { MP_ROM_QSTR(MP_QSTR_MONO_VLSB), MP_ROM_INT(FRAMEBUF_MVLSB) },
    { MP_ROM_QSTR(MP_QSTR_RGB565), MP_ROM_INT(FRAMEBUF_RGB565) },
    { MP_ROM_QSTR(MP_QSTR_GS2_HMSB), MP_ROM_INT(FRAMEBUF_GS2_HMSB) },
    { MP_ROM_QSTR(MP_QSTR_GS4_HMSB), MP_ROM_INT(FRAMEBUF_GS4_HMSB) },
    { MP_ROM_QSTR(MP_QSTR_GS8), MP_ROM_INT(FRAMEBUF_GS8) },
    { MP_ROM_QSTR(MP_QSTR_MONO_HLSB), MP_ROM_INT(FRAMEBUF_MHLSB) },
    { MP_ROM_QSTR(MP_QSTR_MONO_HMSB), MP_ROM_INT(FRAMEBUF_MHMSB) },
};

STATIC MP_DEFINE_CONST_DICT(framebuf_module_globals, framebuf_module_globals_table);

const mp_obj_module_t mp_module_framebuf = {
    .base = { &mp_type_module },
    .globals = (mp_obj_dict_t*)&framebuf_module_globals,
};

#endif // MICROPY_PY_FRAMEBUF