summaryrefslogtreecommitdiff
path: root/payloads/libpayload/drivers/video/graphics.c
blob: 943f8edcae4b2c79bce3e4e2ae24a01f6d679245 (plain)
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
/*
 * This file is part of the libpayload project.
 *
 * Copyright (C) 2015 Google, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <libpayload.h>
#include <cbfs.h>
#include <sysinfo.h>
#include "bitmap.h"

/*
 * 'canvas' is the drawing area located in the center of the screen. It's a
 * square area, stretching vertically to the edges of the screen, leaving
 * non-drawing areas on the left and right. The screen is assumed to be
 * landscape.
 */
static struct rect canvas;
static struct rect screen;

/*
 * Framebuffer is assumed to assign a higher coordinate (larger x, y) to
 * a higher address
 */
static struct cb_framebuffer *fbinfo;
static uint8_t *fbaddr;

#define LOG(x...)	printf("CBGFX: " x)
#define PIVOT_H_MASK	(PIVOT_H_LEFT|PIVOT_H_CENTER|PIVOT_H_RIGHT)
#define PIVOT_V_MASK	(PIVOT_V_TOP|PIVOT_V_CENTER|PIVOT_V_BOTTOM)
#define ROUNDUP(x, y)	((((x) + ((y) - 1)) / (y)) * (y))
#define ABS(x)		((x) < 0 ? -(x) : (x))

static char initialized = 0;

static const struct vector vzero = {
	.x = 0,
	.y = 0,
};

static void add_vectors(struct vector *out,
			const struct vector *v1, const struct vector *v2)
{
	out->x = v1->x + v2->x;
	out->y = v1->y + v2->y;
}

static int is_valid_fraction(const struct fraction *f)
{
	return f->d != 0;
}

/*
 * Transform a vector:
 * 	x' = x * a_x + offset_x
 * 	y' = y * a_y + offset_y
 */
static int transform_vector(struct vector *out,
			    const struct vector *in,
			    const struct scale *a,
			    const struct vector *offset)
{
	if (!is_valid_fraction(&a->x) || !is_valid_fraction(&a->y))
		return CBGFX_ERROR_INVALID_PARAMETER;
	out->x = a->x.n * in->x / a->x.d + offset->x;
	out->y = a->y.n * in->y / a->y.d + offset->y;
	return CBGFX_SUCCESS;
}

/*
 * Returns 1 if v is exclusively within box, 0 if v is inclusively within box,
 * or -1 otherwise. Note that only the right and bottom edges are examined.
 */
static int within_box(const struct vector *v, const struct rect *bound)
{
	if (v->x < bound->offset.x + bound->size.width &&
			v->y < bound->offset.y + bound->size.height)
		return 1;
	else if (v->x <= bound->offset.x + bound->size.width &&
			v->y <= bound->offset.y + bound->size.height)
		return 0;
	else
		return -1;
}

static inline uint32_t calculate_color(const struct rgb_color *rgb)
{
	uint32_t color = 0;
	color |= (rgb->red >> (8 - fbinfo->red_mask_size))
		<< fbinfo->red_mask_pos;
	color |= (rgb->green >> (8 - fbinfo->green_mask_size))
		<< fbinfo->green_mask_pos;
	color |= (rgb->blue >> (8 - fbinfo->blue_mask_size))
		<< fbinfo->blue_mask_pos;
	return color;
}

/*
 * Plot a pixel in a framebuffer. This is called from tight loops. Keep it slim
 * and do the validation at callers' site.
 */
static inline void set_pixel(struct vector *coord, uint32_t color)
{
	const int bpp = fbinfo->bits_per_pixel;
	int i;
	uint8_t * const pixel = fbaddr + (coord->x +
			coord->y * fbinfo->x_resolution) * bpp / 8;
	for (i = 0; i < bpp / 8; i++)
		pixel[i] = (color >> (i * 8));
}

/*
 * Initializes the library. Automatically called by APIs. It sets up
 * the canvas and the framebuffer.
 */
static int cbgfx_init(void)
{
	if (initialized)
		return 0;

	fbinfo = lib_sysinfo.framebuffer;
	if (!fbinfo)
		return CBGFX_ERROR_FRAMEBUFFER_INFO;

	fbaddr = phys_to_virt((uint8_t *)(uintptr_t)(fbinfo->physical_address));
	if (!fbaddr)
		return CBGFX_ERROR_FRAMEBUFFER_ADDR;

	screen.size.width = fbinfo->x_resolution;
	screen.size.height = fbinfo->y_resolution;
	screen.offset.x = 0;
	screen.offset.y = 0;

	/* Calculate canvas size & offset, assuming the screen is landscape */
	if (screen.size.height > screen.size.width) {
		LOG("Portrait screen not supported\n");
		return CBGFX_ERROR_PORTRAIT_SCREEN;
	}
	canvas.size.height = screen.size.height;
	canvas.size.width = canvas.size.height;
	canvas.offset.x = (screen.size.width - canvas.size.width) / 2;
	canvas.offset.y = 0;

	initialized = 1;
	LOG("cbgfx initialized: screen:width=%d, height=%d, offset=%d canvas:width=%d, height=%d, offset=%d\n",
	    screen.size.width, screen.size.height, screen.offset.x,
	    canvas.size.width, canvas.size.height, canvas.offset.x);

	return 0;
}

int draw_box(const struct rect *box, const struct rgb_color *rgb)
{
	struct vector top_left;
	struct vector size;
	struct vector p, t;
	const uint32_t color = calculate_color(rgb);
	const struct scale top_left_s = {
		.x = { .n = box->offset.x, .d = CANVAS_SCALE, },
		.y = { .n = box->offset.y, .d = CANVAS_SCALE, }
	};
	const struct scale size_s = {
		.x = { .n = box->size.x, .d = CANVAS_SCALE, },
		.y = { .n = box->size.y, .d = CANVAS_SCALE, }
	};

	if (cbgfx_init())
		return CBGFX_ERROR_INIT;

	transform_vector(&top_left, &canvas.size, &top_left_s, &canvas.offset);
	transform_vector(&size, &canvas.size, &size_s, &vzero);
	add_vectors(&t, &top_left, &size);
	if (within_box(&t, &canvas) < 0) {
		LOG("Box exceeds canvas boundary\n");
		return CBGFX_ERROR_BOUNDARY;
	}

	for (p.y = top_left.y; p.y < t.y; p.y++)
		for (p.x = top_left.x; p.x < t.x; p.x++)
			set_pixel(&p, color);

	return CBGFX_SUCCESS;
}

int clear_canvas(const struct rgb_color *rgb)
{
	const struct rect box = {
		vzero,
		.size = {
			.width = CANVAS_SCALE,
			.height = CANVAS_SCALE,
		},
	};

	if (cbgfx_init())
		return CBGFX_ERROR_INIT;

	return draw_box(&box, rgb);
}

int clear_screen(const struct rgb_color *rgb)
{
	if (cbgfx_init())
		return CBGFX_ERROR_INIT;

	struct vector p;
	uint32_t color = calculate_color(rgb);
	const int bpp = fbinfo->bits_per_pixel;
	const int bpl = fbinfo->bytes_per_line;

	/* If all significant bytes in color are equal, fastpath through memset.
	 * We assume that for 32bpp the high byte gets ignored anyway. */
	if ((((color >> 8) & 0xff) == (color & 0xff)) && (bpp == 16 ||
	    (((color >> 16) & 0xff) == (color & 0xff)))) {
		memset(fbaddr, color & 0xff, screen.size.height * bpl);
	} else {
		for (p.y = 0; p.y < screen.size.height; p.y++)
			for (p.x = 0; p.x < screen.size.width; p.x++)
				set_pixel(&p, color);
	}

	return CBGFX_SUCCESS;
}

/*
 * Bi-linear Interpolation
 *
 * It estimates the value of a middle point (tx, ty) using the values from four
 * adjacent points (q00, q01, q10, q11).
 */
static uint32_t bli(uint32_t q00, uint32_t q10, uint32_t q01, uint32_t q11,
		    struct fraction *tx, struct fraction *ty)
{
	uint32_t r0 = (tx->n * q10 + (tx->d - tx->n) * q00) / tx->d;
	uint32_t r1 = (tx->n * q11 + (tx->d - tx->n) * q01) / tx->d;
	uint32_t p = (ty->n * r1 + (ty->d - ty->n) * r0) / ty->d;
	return p;
}

static int draw_bitmap_v3(const struct vector *top_left,
			  const struct scale *scale,
			  const struct vector *dim,
			  const struct vector *dim_org,
			  const struct bitmap_header_v3 *header,
			  const struct bitmap_palette_element_v3 *pal,
			  const uint8_t *pixel_array)
{
	const int bpp = header->bits_per_pixel;
	int32_t dir;
	struct vector p;

	if (header->compression) {
		LOG("Compressed bitmaps are not supported\n");
		return CBGFX_ERROR_BITMAP_FORMAT;
	}
	if (bpp >= 16) {
		LOG("Non-palette bitmaps are not supported\n");
		return CBGFX_ERROR_BITMAP_FORMAT;
	}
	if (bpp != 8) {
		LOG("Unsupported bits per pixel: %d\n", bpp);
		return CBGFX_ERROR_BITMAP_FORMAT;
	}
	if (scale->x.n == 0 || scale->y.n == 0) {
		LOG("Scaling out of range\n");
		return CBGFX_ERROR_SCALE_OUT_OF_RANGE;
	}

	const int32_t y_stride = ROUNDUP(dim_org->width * bpp / 8, 4);
	/*
	 * header->height can be positive or negative.
	 *
	 * If it's negative, pixel data is stored from top to bottom. We render
	 * image from the lowest row to the highest row.
	 *
	 * If it's positive, pixel data is stored from bottom to top. We render
	 * image from the highest row to the lowest row.
	 */
	p.y = top_left->y;
	if (header->height < 0) {
		dir = 1;
	} else {
		p.y += dim->height - 1;
		dir = -1;
	}
	/*
	 * Plot pixels scaled by the bilinear interpolation. We scan over the
	 * image on canvas (using d) and find the corresponding pixel in the
	 * bitmap data (using s0, s1).
	 *
	 * When d hits the right bottom corner, s0 also hits the right bottom
	 * corner of the pixel array because that's how scale->x and scale->y
	 * have been set. Since the pixel array size is already validated in
	 * parse_bitmap_header_v3, s0 is guranteed not to exceed pixel array
	 * boundary.
	 */
	struct vector s0, s1, d;
	struct fraction tx, ty;
	for (d.y = 0; d.y < dim->height; d.y++, p.y += dir) {
		s0.y = d.y * scale->y.d / scale->y.n;
		s1.y = s0.y;
		if (s0.y + 1 < dim_org->height)
			s1.y++;
		ty.d = scale->y.n;
		ty.n = (d.y * scale->y.d) % scale->y.n;
		const uint8_t *data0 = pixel_array + s0.y * y_stride;
		const uint8_t *data1 = pixel_array + s1.y * y_stride;
		p.x = top_left->x;
		for (d.x = 0; d.x < dim->width; d.x++, p.x++) {
			s0.x = d.x * scale->x.d / scale->x.n;
			s1.x = s0.x;
			if (s1.x + 1 < dim_org->width)
				s1.x++;
			tx.d = scale->x.n;
			tx.n = (d.x * scale->x.d) % scale->x.n;
			uint8_t c00 = data0[s0.x];
			uint8_t c10 = data0[s1.x];
			uint8_t c01 = data1[s0.x];
			uint8_t c11 = data1[s1.x];
			if (c00 >= header->colors_used
					|| c10 >= header->colors_used
					|| c01 >= header->colors_used
					|| c11 >= header->colors_used) {
				LOG("Color index exceeds palette boundary\n");
				return CBGFX_ERROR_BITMAP_DATA;
			}
			const struct rgb_color rgb = {
				.red = bli(pal[c00].red, pal[c10].red,
					   pal[c01].red, pal[c11].red,
					   &tx, &ty),
				.green = bli(pal[c00].green, pal[c10].green,
					     pal[c01].green, pal[c11].green,
					     &tx, &ty),
				.blue = bli(pal[c00].blue, pal[c10].blue,
					    pal[c01].blue, pal[c11].blue,
					    &tx, &ty),
			};
			set_pixel(&p, calculate_color(&rgb));
		}
	}

	return CBGFX_SUCCESS;
}

static int get_bitmap_file_header(const void *bitmap, size_t size,
				  struct bitmap_file_header *file_header)
{
	const struct bitmap_file_header *fh;

	if (sizeof(*file_header) > size) {
		LOG("Invalid bitmap data\n");
		return CBGFX_ERROR_BITMAP_DATA;
	}
	fh = (struct bitmap_file_header *)bitmap;
	if (fh->signature[0] != 'B' || fh->signature[1] != 'M') {
		LOG("Bitmap signature mismatch\n");
		return CBGFX_ERROR_BITMAP_SIGNATURE;
	}
	file_header->file_size = le32toh(fh->file_size);
	if (file_header->file_size != size) {
		LOG("Bitmap file size does not match cbfs file size\n");
		return CBGFX_ERROR_BITMAP_DATA;
	}
	file_header->bitmap_offset = le32toh(fh->bitmap_offset);

	return CBGFX_SUCCESS;
}

static int parse_bitmap_header_v3(
			const uint8_t *bitmap,
			size_t size,
			/* ^--- IN / OUT ---v */
			struct bitmap_header_v3 *header,
			const struct bitmap_palette_element_v3 **palette,
			const uint8_t **pixel_array,
			struct vector *dim_org)
{
	struct bitmap_file_header file_header;
	struct bitmap_header_v3 *h;
	int rv;

	rv = get_bitmap_file_header(bitmap, size, &file_header);
	if (rv)
		return rv;

	size_t header_offset = sizeof(struct bitmap_file_header);
	size_t header_size = sizeof(struct bitmap_header_v3);
	size_t palette_offset = header_offset + header_size;
	size_t file_size = file_header.file_size;

	h = (struct bitmap_header_v3 *)(bitmap + header_offset);
	header->header_size = le32toh(h->header_size);
	if (header->header_size != header_size) {
		LOG("Unsupported bitmap format\n");
		return CBGFX_ERROR_BITMAP_FORMAT;
	}

	header->width = le32toh(h->width);
	header->height = le32toh(h->height);
	if (header->width == 0 || header->height == 0) {
		LOG("Invalid image width or height\n");
		return CBGFX_ERROR_BITMAP_DATA;
	}
	dim_org->width = header->width;
	dim_org->height = ABS(header->height);

	header->bits_per_pixel = le16toh(h->bits_per_pixel);
	header->compression = le32toh(h->compression);
	header->size = le32toh(h->size);
	header->colors_used = le32toh(h->colors_used);
	size_t palette_size = header->colors_used
			* sizeof(struct bitmap_palette_element_v3);
	size_t pixel_offset = file_header.bitmap_offset;
	if (pixel_offset > file_size) {
		LOG("Bitmap pixel data exceeds buffer boundary\n");
		return CBGFX_ERROR_BITMAP_DATA;
	}
	if (palette_offset + palette_size > pixel_offset) {
		LOG("Bitmap palette data exceeds palette boundary\n");
		return CBGFX_ERROR_BITMAP_DATA;
	}
	*palette = (struct bitmap_palette_element_v3 *)(bitmap +
			palette_offset);

	size_t pixel_size = header->size;
	if (pixel_size != dim_org->height *
		ROUNDUP(dim_org->width * header->bits_per_pixel / 8, 4)) {
		LOG("Bitmap pixel array size does not match expected size\n");
		return CBGFX_ERROR_BITMAP_DATA;
	}
	if (pixel_offset + pixel_size > file_size) {
		LOG("Bitmap pixel array exceeds buffer boundary\n");
		return CBGFX_ERROR_BITMAP_DATA;
	}
	*pixel_array = bitmap + pixel_offset;

	return CBGFX_SUCCESS;
}

/*
 * This calculates the dimension of the image projected on the canvas from the
 * dimension relative to the canvas size. If either width or height is zero, it
 * is derived from the other (non-zero) value to keep the aspect ratio.
 */
static int calculate_dimension(const struct vector *dim_org,
			       const struct scale *dim_rel,
			       struct vector *dim)
{
	if (dim_rel->x.n == 0 && dim_rel->y.n == 0)
		return CBGFX_ERROR_INVALID_PARAMETER;

	if (dim_rel->x.n > dim_rel->x.d || dim_rel->y.n > dim_rel->y.d)
		return CBGFX_ERROR_INVALID_PARAMETER;

	if (dim_rel->x.n > 0) {
		if (!is_valid_fraction(&dim_rel->x))
			return CBGFX_ERROR_INVALID_PARAMETER;
		dim->width = canvas.size.width  * dim_rel->x.n / dim_rel->x.d;
	}
	if (dim_rel->y.n > 0) {
		if (!is_valid_fraction(&dim_rel->y))
			return CBGFX_ERROR_INVALID_PARAMETER;
		dim->height = canvas.size.height * dim_rel->y.n / dim_rel->y.d;
	}

	/* Derive height from width using aspect ratio */
	if (dim_rel->y.n == 0)
		dim->height = dim->width * dim_org->height / dim_org->width;
	/* Derive width from height using aspect ratio */
	if (dim_rel->x.n == 0)
		dim->width = dim->height * dim_org->width / dim_org->height;

	return CBGFX_SUCCESS;
}

static int calculate_position(const struct vector *dim,
			      const struct scale *pos_rel, uint8_t pivot,
			      struct vector *top_left)
{
	int rv;

	rv = transform_vector(top_left, &canvas.size, pos_rel, &canvas.offset);
	if (rv)
		return rv;

	switch (pivot & PIVOT_H_MASK) {
	case PIVOT_H_LEFT:
		break;
	case PIVOT_H_CENTER:
		top_left->x -= dim->width / 2;
		break;
	case PIVOT_H_RIGHT:
		top_left->x -= dim->width;
		break;
	default:
		return CBGFX_ERROR_INVALID_PARAMETER;
	}

	switch (pivot & PIVOT_V_MASK) {
	case PIVOT_V_TOP:
		break;
	case PIVOT_V_CENTER:
		top_left->y -= dim->height / 2;
		break;
	case PIVOT_V_BOTTOM:
		top_left->y -= dim->height;
		break;
	default:
		return CBGFX_ERROR_INVALID_PARAMETER;
	}

	return CBGFX_SUCCESS;
}

static int check_boundary(const struct vector *top_left,
			  const struct vector *dim,
			  const struct rect *bound)
{
	struct vector v;
	add_vectors(&v, dim, top_left);
	if (top_left->x < bound->offset.x
			|| top_left->y < bound->offset.y
			|| within_box(&v, bound) < 0)
		return CBGFX_ERROR_BOUNDARY;
	return CBGFX_SUCCESS;
}

int draw_bitmap(const void *bitmap, size_t size,
		const struct scale *pos_rel, uint8_t pivot,
		const struct scale *dim_rel)
{
	struct bitmap_header_v3 header;
	const struct bitmap_palette_element_v3 *palette;
	const uint8_t *pixel_array;
	struct vector top_left, dim, dim_org;
	struct scale scale;
	int rv;

	if (cbgfx_init())
		return CBGFX_ERROR_INIT;

	/* only v3 is supported now */
	rv = parse_bitmap_header_v3(bitmap, size,
				    &header, &palette, &pixel_array, &dim_org);
	if (rv)
		return rv;

	/* Calculate height and width of the image */
	rv = calculate_dimension(&dim_org, dim_rel, &dim);
	if (rv)
		return rv;

	/* Calculate self scale */
	scale.x.n = dim.width;
	scale.x.d = dim_org.width;
	scale.y.n = dim.height;
	scale.y.d = dim_org.height;

	/* Calculate coordinate */
	rv = calculate_position(&dim, pos_rel, pivot, &top_left);
	if (rv)
		return rv;

	rv = check_boundary(&top_left, &dim, &canvas);
	if (rv) {
		LOG("Bitmap image exceeds canvas boundary\n");
		return rv;
	}

	return draw_bitmap_v3(&top_left, &scale, &dim, &dim_org,
			      &header, palette, pixel_array);
}

int draw_bitmap_direct(const void *bitmap, size_t size,
		       const struct vector *top_left)
{
	struct bitmap_header_v3 header;
	const struct bitmap_palette_element_v3 *palette;
	const uint8_t *pixel_array;
	struct vector dim;
	struct scale scale;
	int rv;

	if (cbgfx_init())
		return CBGFX_ERROR_INIT;

	/* only v3 is supported now */
	rv = parse_bitmap_header_v3(bitmap, size,
				    &header, &palette, &pixel_array, &dim);
	if (rv)
		return rv;

	/* Calculate self scale */
	scale.x.n = 1;
	scale.x.d = 1;
	scale.y.n = 1;
	scale.y.d = 1;

	rv = check_boundary(top_left, &dim, &screen);
	if (rv) {
		LOG("Bitmap image exceeds screen boundary\n");
		return rv;
	}

	return draw_bitmap_v3(top_left, &scale, &dim, &dim,
			      &header, palette, pixel_array);
}

int get_bitmap_dimension(const void *bitmap, size_t sz, struct scale *dim_rel)
{
	struct bitmap_header_v3 header;
	const struct bitmap_palette_element_v3 *palette;
	const uint8_t *pixel_array;
	struct vector dim, dim_org;
	int rv;

	if (cbgfx_init())
		return CBGFX_ERROR_INIT;

	/* Only v3 is supported now */
	rv = parse_bitmap_header_v3(bitmap, sz,
				    &header, &palette, &pixel_array, &dim_org);
	if (rv)
		return rv;

	/* Calculate height and width of the image */
	rv = calculate_dimension(&dim_org, dim_rel, &dim);
	if (rv)
		return rv;

	/* Calculate size relative to the canvas */
	dim_rel->x.n = dim.width;
	dim_rel->x.d = canvas.size.width;
	dim_rel->y.n = dim.height;
	dim_rel->y.d = canvas.size.height;

	return CBGFX_SUCCESS;
}