summaryrefslogtreecommitdiffstats
path: root/minui/graphics.cpp
blob: f3380aaa094808b1836b5354d0b676a8fe94375e (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
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
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "graphics.h"

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

#include <memory>

#ifdef BOARD_USE_CUSTOM_RECOVERY_FONT
#include BOARD_USE_CUSTOM_RECOVERY_FONT
#else
#include "font_10x18.h"
#endif

#ifndef MSM_BSP
#include "graphics_adf.h"
#endif
#include "graphics_drm.h"
#include "graphics_fbdev.h"
#include "graphics_overlay.h"
#include "minui/minui.h"

static GRFont* gr_font = NULL;
static MinuiBackend* gr_backend = nullptr;

static int overscan_percent = OVERSCAN_PERCENT;
static int overscan_offset_x = 0;
static int overscan_offset_y = 0;

#ifdef TW_NO_MINUI_CUSTOM_FONTS
static unsigned char gr_current_r = 255;
static unsigned char gr_current_g = 255;
static unsigned char gr_current_b = 255;
#endif
static unsigned char gr_current_a = 255;
static unsigned char rgb_555[2];
static unsigned char gr_current_r5 = 31;
static unsigned char gr_current_g5 = 63;
static unsigned char gr_current_b5 = 31;

static uint32_t gr_current = ~0;
static constexpr uint32_t alpha_mask = 0xff000000;

static GRSurface* gr_draw = NULL;
static GRRotation rotation = ROTATION_NONE;

static bool outside(int x, int y) {
  return x < 0 || x >= (rotation % 2 ? gr_draw->height : gr_draw->width) || y < 0 ||
         y >= (rotation % 2 ? gr_draw->width : gr_draw->height);
}

#ifdef TW_NO_MINUI_CUSTOM_FONTS
int gr_measure(const char *s)
{
    return gr_font->char_width * strlen(s);
}

void gr_font_size(int *x, int *y)
{
    *x = gr_font->char_width;
    *y = gr_font->char_height;
}
#else // TW_USE_MINUI_CUSTOM_FONTS
const GRFont* gr_sys_font() {
  return gr_font;
}

int gr_measure(const GRFont* font, const char* s) {
  return font->char_width * strlen(s);
}

void gr_font_size(const GRFont* font, int* x, int* y) {
  *x = font->char_width;
  *y = font->char_height;
}
#endif // TW_NO_MINUI_CUSTOM_FONTS

void blend_16bpp(unsigned char* px, unsigned r5, unsigned g5, unsigned b5, unsigned char a)
{
    unsigned char orig[2];
    orig[0] = px[0];
    orig[1] = px[1];

    /* This code is a little easier to read
    unsigned oldred = (orig[1] >> 3);
    unsigned oldgreen = (((orig[0] >> 5) << 3) + (orig[1] & 0x7));
    unsigned oldblue = (orig[0] & 0x1F);

    unsigned newred = (oldred * (255-a) + r5 * a) / 255;
    unsigned newgreen = (oldgreen * (255-a) + g5 * a) / 255;
    unsigned newblue = (oldblue * (255-a) + b5 * a) / 255;
    */

    unsigned newred = ((orig[1] >> 3) * (255-a) + r5 * a) / 255;
    unsigned newgreen = ((((orig[0] >> 5) << 3) + (orig[1] & 0x7)) * (255-a) + g5 * a) / 255;
    unsigned newblue = ((orig[0] & 0x1F) * (255-a) + b5 * a) / 255;

    *px++ = (newgreen << 5) + (newblue);
    *px++ = (newred << 3) + (newgreen >> 3);
}

#ifdef TW_NO_MINUI_CUSTOM_FONTS
static void text_blend_old(unsigned char* src_p, int src_row_bytes,
                       unsigned char* dst_p, int dst_row_bytes,
                       int width, int height)
{
    for (int j = 0; j < height; ++j) {
        unsigned char* sx = src_p;
        unsigned char* px = dst_p;
        for (int i = 0; i < width; ++i) {
            unsigned char a = *sx++;
            if (gr_current_a < 255) a = ((int)a * gr_current_a) / 255;
            if (a == 255) {
                if (gr_draw->pixel_bytes == 2) {
                    *px++ = rgb_555[0];
                    *px++ = rgb_555[1];
                } else {
                    *px++ = gr_current_r;
                    *px++ = gr_current_g;
                    *px++ = gr_current_b;
                    px++;
                }
            } else if (a > 0) {
                if (gr_draw->pixel_bytes == 2) {
                    blend_16bpp(px, gr_current_r5, gr_current_g5, gr_current_b5, a);
                    px += gr_draw->pixel_bytes;
                } else {
                    *px = (*px * (255-a) + gr_current_r * a) / 255;
                    ++px;
                    *px = (*px * (255-a) + gr_current_g * a) / 255;
                    ++px;
                    *px = (*px * (255-a) + gr_current_b * a) / 255;
                    ++px;
                    ++px;
                }
            } else {
                px += gr_draw->pixel_bytes;
            }
        }
        src_p += src_row_bytes;
        dst_p += dst_row_bytes;
    }
}
#endif // TW_NO_MINUI_CUSTOM_FONTS

// Blends gr_current onto pix value, assumes alpha as most significant byte.
static inline uint16_t pixel_blend16(uint8_t a, uint16_t pix) {
  unsigned char orig[2];
  orig[0] = (pix & 0xFF00) >> 8;
  orig[1] = pix & 0x00FF;

  /* This code is a little easier to read
  unsigned oldred = (orig[1] >> 3);
  unsigned oldgreen = (((orig[0] >> 5) << 3) + (orig[1] & 0x7));
  unsigned oldblue = (orig[0] & 0x1F);

  unsigned newred = (oldred * (255-a) + r5 * a) / 255;
  unsigned newgreen = (oldgreen * (255-a) + g5 * a) / 255;
  unsigned newblue = (oldblue * (255-a) + b5 * a) / 255;
  */

  unsigned newred = ((orig[1] >> 3) * (255-a) + gr_current_r5 * a) / 255;
  unsigned newgreen = ((((orig[0] >> 5) << 3) + (orig[1] & 0x7)) * (255-a) + gr_current_g5 * a) / 255;
  unsigned newblue = ((orig[0] & 0x1F) * (255-a) + gr_current_b5 * a) / 255;

  uint16_t newpix = (newred << 10) + (newgreen << 5) + newblue;
  return newpix;
}

// Blends gr_current onto pix value, assumes alpha as most significant byte.
static inline uint32_t pixel_blend(uint8_t alpha, uint32_t pix) {
  if (alpha == 255) return gr_current;
  if (alpha == 0) return pix;
  uint32_t pix_r = pix & 0xff;
  uint32_t pix_g = pix & 0xff00;
  uint32_t pix_b = pix & 0xff0000;
  uint32_t cur_r = gr_current & 0xff;
  uint32_t cur_g = gr_current & 0xff00;
  uint32_t cur_b = gr_current & 0xff0000;

  uint32_t out_r = (pix_r * (255 - alpha) + cur_r * alpha) / 255;
  uint32_t out_g = (pix_g * (255 - alpha) + cur_g * alpha) / 255;
  uint32_t out_b = (pix_b * (255 - alpha) + cur_b * alpha) / 255;

  return (out_r & 0xff) | (out_g & 0xff00) | (out_b & 0xff0000) | (gr_current & 0xff000000);
}

// increments pixel pointer right, with current rotation.
static void incr_x16(uint16_t** p, int row_pixels) {
  if (rotation % 2) {
    *p = *p + (rotation == 1 ? 1 : -1) * row_pixels;
  } else {
    *p = *p + (rotation ? -1 : 1);
  }
}

// increments pixel pointer down, with current rotation.
static void incr_y16(uint16_t** p, int row_pixels) {
  if (rotation % 2) {
    *p = *p + (rotation == 1 ? -1 : 1);
  } else {
    *p = *p + (rotation ? -1 : 1) * row_pixels;
  }
}

// increments pixel pointer right, with current rotation.
static void incr_x(uint32_t** p, int row_pixels) {
  if (rotation % 2) {
    *p = *p + (rotation == 1 ? 1 : -1) * row_pixels;
  } else {
    *p = *p + (rotation ? -1 : 1);
  }
}

// increments pixel pointer down, with current rotation.
static void incr_y(uint32_t** p, int row_pixels) {
  if (rotation % 2) {
    *p = *p + (rotation == 1 ? -1 : 1);
  } else {
    *p = *p + (rotation ? -1 : 1) * row_pixels;
  }
}

// returns pixel pointer at given coordinates with rotation adjustment.
static uint16_t* pixel_at16(GRSurface* surf, int x, int y, int row_pixels) {
  switch (rotation) {
    case ROTATION_NONE:
      return reinterpret_cast<uint16_t*>(surf->data) + y * row_pixels + x;
    case ROTATION_RIGHT:
      return reinterpret_cast<uint16_t*>(surf->data) + x * row_pixels + (surf->width - y);
    case ROTATION_DOWN:
      return reinterpret_cast<uint16_t*>(surf->data) + (surf->height - 1 - y) * row_pixels +
             (surf->width - 1 - x);
    case ROTATION_LEFT:
      return reinterpret_cast<uint16_t*>(surf->data) + (surf->height - 1 - x) * row_pixels + y;
    default:
      printf("invalid rotation %d", rotation);
  }
  return nullptr;
}

// returns pixel pointer at given coordinates with rotation adjustment.
static uint32_t* pixel_at(GRSurface* surf, int x, int y, int row_pixels) {
  switch (rotation) {
    case ROTATION_NONE:
      return reinterpret_cast<uint32_t*>(surf->data) + y * row_pixels + x;
    case ROTATION_RIGHT:
      return reinterpret_cast<uint32_t*>(surf->data) + x * row_pixels + (surf->width - y);
    case ROTATION_DOWN:
      return reinterpret_cast<uint32_t*>(surf->data) + (surf->height - 1 - y) * row_pixels +
             (surf->width - 1 - x);
    case ROTATION_LEFT:
      return reinterpret_cast<uint32_t*>(surf->data) + (surf->height - 1 - x) * row_pixels + y;
    default:
      printf("invalid rotation %d", rotation);
  }
  return nullptr;
}

static void text_blend16(uint8_t* src_p, int src_row_bytes, uint16_t* dst_p, int dst_row_pixels,
                       int width, int height) {
  uint8_t alpha_current = static_cast<uint8_t>((alpha_mask & gr_current) >> 24);
  for (int j = 0; j < height; ++j) {
    uint8_t* sx = src_p;
    uint16_t* px = dst_p;
    for (int i = 0; i < width; ++i, incr_x16(&px, dst_row_pixels)) {
      uint8_t a = *sx++;
      if (alpha_current < 255) a = (static_cast<uint32_t>(a) * alpha_current) / 255;
      *px = pixel_blend16(a, *px);
    }
    src_p += src_row_bytes;
    incr_y16(&dst_p, dst_row_pixels);
  }
}

static void text_blend(uint8_t* src_p, int src_row_bytes, uint32_t* dst_p, int dst_row_pixels,
                       int width, int height) {
  uint8_t alpha_current = static_cast<uint8_t>((alpha_mask & gr_current) >> 24);
  for (int j = 0; j < height; ++j) {
    uint8_t* sx = src_p;
    uint32_t* px = dst_p;
    for (int i = 0; i < width; ++i, incr_x(&px, dst_row_pixels)) {
      uint8_t a = *sx++;
      if (alpha_current < 255) a = (static_cast<uint32_t>(a) * alpha_current) / 255;
      *px = pixel_blend(a, *px);
    }
    src_p += src_row_bytes;
    incr_y(&dst_p, dst_row_pixels);
  }
}


#ifdef TW_NO_MINUI_CUSTOM_FONTS
void gr_text(int x, int y, const char *s, bool bold)
{
    GRFont* font = gr_font;

    if (!font->texture || gr_current_a == 0) return;

    bold = bold && (font->texture->height != font->char_height);

    x += overscan_offset_x;
    y += overscan_offset_y;

    unsigned char ch;
    while ((ch = *s++)) {
        if (outside(x, y) || outside(x+font->char_width-1, y+font->char_height-1)) break;

        if (ch < ' ' || ch > '~') {
            ch = '?';
        }

        unsigned char* src_p = font->texture->data + ((ch - ' ') * font->char_width) +
                               (bold ? font->char_height * font->texture->row_bytes : 0);
        unsigned char* dst_p = gr_draw->data + y*gr_draw->row_bytes + x*gr_draw->pixel_bytes;

        text_blend_old(src_p, font->texture->row_bytes,
                       dst_p, gr_draw->row_bytes,
                       font->char_width, font->char_height);

        x += font->char_width;
    }
}
#else //TW_NO_MINUI_CUSTOM_FONTS
void gr_text(const GRFont* font, int x, int y, const char* s, bool bold) {
  if (!font || !font->texture || (gr_current & alpha_mask) == 0) return;

  if (font->texture->pixel_bytes != 1) {
    printf("gr_text: font has wrong format\n");
    return;
  }

  bold = bold && (font->texture->height != font->char_height);

  x += overscan_offset_x;
  y += overscan_offset_y;

  unsigned char ch;
  while ((ch = *s++)) {
    if (outside(x, y) || outside(x + font->char_width - 1, y + font->char_height - 1)) break;

    if (ch < ' ' || ch > '~') {
      ch = '?';
    }

    int row_pixels = gr_draw->row_bytes / gr_draw->pixel_bytes;

    uint8_t* src_p = font->texture->data + ((ch - ' ') * font->char_width) +
                     (bold ? font->char_height * font->texture->row_bytes : 0);
    if (gr_draw->pixel_bytes == 2) {
      uint16_t* dst_p = pixel_at16(gr_draw, x, y, row_pixels);
      
      text_blend16(src_p, font->texture->row_bytes, dst_p, row_pixels, font->char_width,
                   font->char_height);
    } else { // not indenting AOSP original code
    uint32_t* dst_p = pixel_at(gr_draw, x, y, row_pixels);

    text_blend(src_p, font->texture->row_bytes, dst_p, row_pixels, font->char_width,
               font->char_height);
    }
    x += font->char_width;
  }
}
#endif //TW_NO_MINUI_CUSTOM_FONTS

void gr_texticon(int x, int y, GRSurface* icon) {
  if (icon == NULL) return;

  if (icon->pixel_bytes != 1) {
    printf("gr_texticon: source has wrong format\n");
    return;
  }

  x += overscan_offset_x;
  y += overscan_offset_y;

  if (outside(x, y) || outside(x + icon->width - 1, y + icon->height - 1)) return;

  int row_pixels = gr_draw->row_bytes / gr_draw->pixel_bytes;
  uint8_t* src_p = icon->data;
  if (gr_draw->pixel_bytes == 2) {
	uint16_t* dst_p = pixel_at16(gr_draw, x, y, row_pixels);

    text_blend16(src_p, icon->row_bytes, dst_p, row_pixels, icon->width, icon->height);
    return;
  }
  uint32_t* dst_p = pixel_at(gr_draw, x, y, row_pixels);

  text_blend(src_p, icon->row_bytes, dst_p, row_pixels, icon->width, icon->height);
}

void gr_convert_rgb_555(unsigned char r, unsigned char g, unsigned char b)
{
    gr_current_r5 = (((r & 0xFF) * 0x1F) + 0x7F) / 0xFF;
    gr_current_g5 = (((g & 0xFF) * 0x3F) + 0x7F) / 0xFF;
    gr_current_b5 = (((b & 0xFF) * 0x1F) + 0x7F) / 0xFF;

    rgb_555[0] = (gr_current_g5 << 5) + (gr_current_b5);
    rgb_555[1] = (gr_current_r5 << 3) + (gr_current_g5 >> 3);
}

void gr_color(unsigned char r, unsigned char g, unsigned char b, unsigned char a) {
#ifdef TW_NO_MINUI_CUSTOM_FONTS
#if defined(RECOVERY_ABGR) || defined(RECOVERY_BGRA)
  gr_current_r = b;
  gr_current_g = g;
  gr_current_b = r;
#else
  gr_current_r = r;
  gr_current_g = g;
  gr_current_b = b;
#endif
#endif

  if (gr_draw->pixel_bytes == 2) {
	gr_current_a = a;
    gr_convert_rgb_555(r, g, b);
    return;
  }

  uint32_t r32 = r, g32 = g, b32 = b, a32 = a;
#if defined(RECOVERY_ABGR) || defined(RECOVERY_BGRA)
  gr_current = (a32 << 24) | (r32 << 16) | (g32 << 8) | b32;
#else
  gr_current = (a32 << 24) | (b32 << 16) | (g32 << 8) | r32;
#endif
}

void gr_clear() {
  if (gr_draw->pixel_bytes == 2) {
    gr_fill(0, 0, gr_fb_width(), gr_fb_height());
    return;
  }

  // This code only works on 32bpp devices
  if ((gr_current & 0xff) == ((gr_current >> 8) & 0xff) &&
      (gr_current & 0xff) == ((gr_current >> 16) & 0xff) &&
      (gr_current & 0xff) == ((gr_current >> 24) & 0xff) &&
      gr_draw->row_bytes == gr_draw->width * gr_draw->pixel_bytes) {
    memset(gr_draw->data, gr_current & 0xff, gr_draw->height * gr_draw->row_bytes);
  } else {
    uint32_t* px = reinterpret_cast<uint32_t*>(gr_draw->data);
    int row_diff = gr_draw->row_bytes / gr_draw->pixel_bytes - gr_draw->width;
    for (int y = 0; y < gr_draw->height; ++y) {
      for (int x = 0; x < gr_draw->width; ++x) {
        *px++ = gr_current;
      }
      px += row_diff;
    }
  }
}

void gr_fill(int x1, int y1, int x2, int y2) {
  x1 += overscan_offset_x;
  y1 += overscan_offset_y;

  x2 += overscan_offset_x;
  y2 += overscan_offset_y;

  if (outside(x1, y1) || outside(x2 - 1, y2 - 1)) return;

  int row_pixels = gr_draw->row_bytes / gr_draw->pixel_bytes;
  if (gr_draw->pixel_bytes == 2) {
	uint16_t* p = pixel_at16(gr_draw, x1, y1, row_pixels);
    uint8_t alpha = static_cast<uint8_t>(((gr_current & alpha_mask) >> 24));
    if (alpha > 0) {
      for (int y = y1; y < y2; ++y) {
        uint16_t* px = p;
        for (int x = x1; x < x2; ++x) {
          *px = pixel_blend16(alpha, *px);
          incr_x16(&px, row_pixels);
        }
        incr_y16(&p, row_pixels);
      }
    }
	return;
  }
  { // open brace to maintain separation between uint16_t p and uint32_t p
  uint32_t* p = pixel_at(gr_draw, x1, y1, row_pixels);
  uint8_t alpha = static_cast<uint8_t>(((gr_current & alpha_mask) >> 24));
  if (alpha > 0) {
    for (int y = y1; y < y2; ++y) {
      uint32_t* px = p;
      for (int x = x1; x < x2; ++x) {
        *px = pixel_blend(alpha, *px);
        incr_x(&px, row_pixels);
      }
      incr_y(&p, row_pixels);
    }
  }
  } // close brace to maintain separation between uint16_t p and uint32_t p
}

void gr_blit_32to16(GRSurface* source, int sx, int sy, int w, int h, int dx, int dy) {
  if (rotation)
    printf("gr_blit_32to16 does not support rotation!\n"); // but we'll draw something in the wrong spot anyway because, why not!

  dx += overscan_offset_x;
  dy += overscan_offset_y;

  if (outside(dx, dy) || outside(dx+w-1, dy+h-1)) return;

  unsigned char* src_p = source->data + sy*source->row_bytes + sx*source->pixel_bytes;
  unsigned char* dst_p = gr_draw->data + dy*gr_draw->row_bytes + dx*gr_draw->pixel_bytes;

  int i, j;
  for (i = 0; i < h; ++i) {
    unsigned char* spx = src_p;
    unsigned char* dpx = dst_p;

    for (j = 0; j < w; ++j) {
      unsigned a = spx[3];

      if (a == 0) {
        spx += source->pixel_bytes;
        dpx += gr_draw->pixel_bytes;
      } else {
        unsigned r5 = (((*spx++ & 0xFF) * 0x1F) + 0x7F) / 0xFF;
        unsigned g5 = (((*spx++ & 0xFF) * 0x3F) + 0x7F) / 0xFF;
        unsigned b5 = (((*spx++ & 0xFF) * 0x1F) + 0x7F) / 0xFF;
        spx++;
        if (a == 255) {
          *dpx++ = (g5 << 5) + (b5);
          *dpx++ = (r5 << 3) + (g5 >> 3);
        } else {
          blend_16bpp(dpx, r5, g5, b5, a);
          spx += source->pixel_bytes;
        }
      }
    }
    src_p += source->row_bytes;
    dst_p += gr_draw->row_bytes;
  }
}

void gr_blit(GRSurface* source, int sx, int sy, int w, int h, int dx, int dy) {
  if (source == NULL) return;

  if (gr_draw->pixel_bytes != source->pixel_bytes) {
    if (gr_draw->pixel_bytes == 2 && source->pixel_bytes == 4) {
      gr_blit_32to16(source, sx, sy, w, h, dx, dy);
      return;
    } else {
      printf("gr_blit: source has wrong format\n");
      return;
    }
  }

  dx += overscan_offset_x;
  dy += overscan_offset_y;

  if (outside(dx, dy) || outside(dx + w - 1, dy + h - 1)) return;

  if (rotation) {
    int src_row_pixels = source->row_bytes / source->pixel_bytes;
    int row_pixels = gr_draw->row_bytes / gr_draw->pixel_bytes;
    uint32_t* src_py = reinterpret_cast<uint32_t*>(source->data) + sy * source->row_bytes / 4 + sx;
    uint32_t* dst_py = pixel_at(gr_draw, dx, dy, row_pixels);

    for (int y = 0; y < h; y += 1) {
      uint32_t* src_px = src_py;
      uint32_t* dst_px = dst_py;
      for (int x = 0; x < w; x += 1) {
        *dst_px = *src_px++;
        incr_x(&dst_px, row_pixels);
      }
      src_py += src_row_pixels;
      incr_y(&dst_py, row_pixels);
    }
  } else {
    unsigned char* src_p = source->data + sy * source->row_bytes + sx * source->pixel_bytes;
    unsigned char* dst_p = gr_draw->data + dy * gr_draw->row_bytes + dx * gr_draw->pixel_bytes;

    int i;
    for (i = 0; i < h; ++i) {
      memcpy(dst_p, src_p, w * source->pixel_bytes);
      src_p += source->row_bytes;
      dst_p += gr_draw->row_bytes;
    }
  }
}

unsigned int gr_get_width(GRSurface* surface) {
  if (surface == NULL) {
    return 0;
  }
  return surface->width;
}

unsigned int gr_get_height(GRSurface* surface) {
  if (surface == NULL) {
    return 0;
  }
  return surface->height;
}

#ifdef TW_NO_MINUI_CUSTOM_FONTS
static void gr_init_font(void)
{
    gr_font = reinterpret_cast<GRFont*>(calloc(sizeof(*gr_font), 1));

    int res = res_create_alpha_surface("font", &(gr_font->texture));
    if (res == 0) {
        // The font image should be a 96x2 array of character images.  The
        // columns are the printable ASCII characters 0x20 - 0x7f.  The
        // top row is regular text; the bottom row is bold.
        gr_font->char_width = gr_font->texture->width / 96;
        gr_font->char_height = gr_font->texture->height / 2;
    } else {
        printf("failed to read font: res=%d\n", res);

        // fall back to the compiled-in font.
        gr_font->texture = reinterpret_cast<GRSurface*>(malloc(sizeof(*gr_font->texture)));
        gr_font->texture->width = font.width;
        gr_font->texture->height = font.height;
        gr_font->texture->row_bytes = font.width;
        gr_font->texture->pixel_bytes = 1;

        unsigned char* bits = reinterpret_cast<unsigned char*>(malloc(font.width * font.height));
        gr_font->texture->data = reinterpret_cast<unsigned char*>(bits);

        unsigned char data;
        unsigned char* in = font.rundata;
        while((data = *in++)) {
            memset(bits, (data & 0x80) ? 255 : 0, data & 0x7f);
            bits += (data & 0x7f);
        }

        gr_font->char_width = font.char_width;
        gr_font->char_height = font.char_height;
    }
}

void gr_set_font(__attribute__ ((unused))const char* name) {
	//this cm function is made to change font. Don't care, just init the font:
	gr_init_font();
	return;
}
#else // TW_NO_MINUI_CUSTOM_FONTS
int gr_init_font(const char* name, GRFont** dest) {
  GRFont* font = static_cast<GRFont*>(calloc(1, sizeof(*gr_font)));
  if (font == nullptr) {
    return -1;
  }

  int res = res_create_alpha_surface(name, &(font->texture));
  if (res < 0) {
    free(font);
    return res;
  }

  // The font image should be a 96x2 array of character images.  The
  // columns are the printable ASCII characters 0x20 - 0x7f.  The
  // top row is regular text; the bottom row is bold.
  font->char_width = font->texture->width / 96;
  font->char_height = font->texture->height / 2;

  *dest = font;

  return 0;
}

static void gr_init_font(void) {
  int res = gr_init_font("font", &gr_font);
  if (res == 0) {
    return;
  }

  printf("failed to read font: res=%d\n", res);

  // fall back to the compiled-in font.
  gr_font = static_cast<GRFont*>(calloc(1, sizeof(*gr_font)));
  gr_font->texture = static_cast<GRSurface*>(malloc(sizeof(*gr_font->texture)));
  gr_font->texture->width = font.width;
  gr_font->texture->height = font.height;
  gr_font->texture->row_bytes = font.width;
  gr_font->texture->pixel_bytes = 1;

  unsigned char* bits = static_cast<unsigned char*>(malloc(font.width * font.height));
  gr_font->texture->data = bits;

  unsigned char data;
  unsigned char* in = font.rundata;
  while ((data = *in++)) {
    memset(bits, (data & 0x80) ? 255 : 0, data & 0x7f);
    bits += (data & 0x7f);
  }

  gr_font->char_width = font.char_width;
  gr_font->char_height = font.char_height;
}
#endif // TW_NO_MINUI_CUSTOM_FONTS

void gr_flip() {
  gr_draw = gr_backend->Flip();
}

int gr_init(void)
{
  gr_init_font();

  auto backend = std::unique_ptr<MinuiBackend>{ std::make_unique<MinuiBackendOverlay>() };
  gr_draw = backend->Init();

#ifdef MSM_BSP
    if (gr_draw) {
        printf("Using overlay graphics.\n");
    }
#endif

#ifndef MSM_BSP
    if (!gr_draw) {
		backend = std::make_unique<MinuiBackendAdf>();
        gr_draw = backend->Init();
        if (gr_draw)
             printf("Using adf graphics.\n");
    }
#else
	printf("Skipping adf graphics because TW_TARGET_USES_QCOM_BSP := true\n");
#endif

    if (!gr_draw) {
        backend = std::make_unique<MinuiBackendDrm>();
        gr_draw = backend->Init();
        if (gr_draw)
            printf("Using drm graphics.\n");
    }

    if (!gr_draw) {
        backend = std::make_unique<MinuiBackendFbdev>();
        gr_draw = backend->Init();
        if (gr_draw)
            printf("Using fbdev graphics.\n");
    }

  if (!gr_draw) {
    return -1;
  }

  gr_backend = backend.release();

  overscan_offset_x = gr_draw->width * overscan_percent / 100;
  overscan_offset_y = gr_draw->height * overscan_percent / 100;

  gr_flip();
  gr_flip();

  gr_rotate(DEFAULT_ROTATION);

  if (gr_draw->pixel_bytes != 4) {
    printf("gr_init: Only 4-byte pixel formats supported\n");
  }

  return 0;
}

void gr_exit() {
  delete gr_backend;
}

int gr_fb_width() {
  return rotation % 2 ? gr_draw->height - 2 * overscan_offset_y
                      : gr_draw->width - 2 * overscan_offset_x;
}

int gr_fb_height() {
  return rotation % 2 ? gr_draw->width - 2 * overscan_offset_x
                      : gr_draw->height - 2 * overscan_offset_y;
}

void gr_fb_blank(bool blank) {
  gr_backend->Blank(blank);
}

void gr_rotate(GRRotation rot) {
  rotation = rot;
}