summaryrefslogtreecommitdiff
path: root/drivers/video/video_bmp.c
blob: f803067da31b9ae54267074bbf083fe5a57e22e2 (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
/*
 * Copyright (c) 2015 Google, Inc
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <bmp_layout.h>
#include <dm.h>
#include <mapmem.h>
#include <video.h>
#include <watchdog.h>
#include <asm/unaligned.h>

#ifdef CONFIG_VIDEO_BMP_RLE8
#define BMP_RLE8_ESCAPE		0
#define BMP_RLE8_EOL		0
#define BMP_RLE8_EOBMP		1
#define BMP_RLE8_DELTA		2

static void draw_unencoded_bitmap(ushort **fbp, uchar *bmap, ushort *cmap,
				  int cnt)
{
	while (cnt > 0) {
		*(*fbp)++ = cmap[*bmap++];
		cnt--;
	}
}

static void draw_encoded_bitmap(ushort **fbp, ushort col, int cnt)
{
	ushort *fb = *fbp;

	while (cnt > 0) {
		*fb++ = col;
		cnt--;
	}
	*fbp = fb;
}

static void video_display_rle8_bitmap(struct udevice *dev,
				      struct bmp_image *bmp, ushort *cmap,
				      uchar *fb, int x_off, int y_off)
{
	struct video_priv *priv = dev_get_uclass_priv(dev);
	uchar *bmap;
	ulong width, height;
	ulong cnt, runlen;
	int x, y;
	int decode = 1;

	debug("%s\n", __func__);
	width = get_unaligned_le32(&bmp->header.width);
	height = get_unaligned_le32(&bmp->header.height);
	bmap = (uchar *)bmp + get_unaligned_le32(&bmp->header.data_offset);

	x = 0;
	y = height - 1;

	while (decode) {
		if (bmap[0] == BMP_RLE8_ESCAPE) {
			switch (bmap[1]) {
			case BMP_RLE8_EOL:
				/* end of line */
				bmap += 2;
				x = 0;
				y--;
				/* 16bpix, 2-byte per pixel, width should *2 */
				fb -= (width * 2 + priv->line_length);
				break;
			case BMP_RLE8_EOBMP:
				/* end of bitmap */
				decode = 0;
				break;
			case BMP_RLE8_DELTA:
				/* delta run */
				x += bmap[2];
				y -= bmap[3];
				/* 16bpix, 2-byte per pixel, x should *2 */
				fb = (uchar *)(priv->fb + (y + y_off - 1)
					* priv->line_length + (x + x_off) * 2);
				bmap += 4;
				break;
			default:
				/* unencoded run */
				runlen = bmap[1];
				bmap += 2;
				if (y < height) {
					if (x < width) {
						if (x + runlen > width)
							cnt = width - x;
						else
							cnt = runlen;
						draw_unencoded_bitmap(
							(ushort **)&fb,
							bmap, cmap, cnt);
					}
					x += runlen;
				}
				bmap += runlen;
				if (runlen & 1)
					bmap++;
			}
		} else {
			/* encoded run */
			if (y < height) {
				runlen = bmap[0];
				if (x < width) {
					/* aggregate the same code */
					while (bmap[0] == 0xff &&
					       bmap[2] != BMP_RLE8_ESCAPE &&
					       bmap[1] == bmap[3]) {
						runlen += bmap[2];
						bmap += 2;
					}
					if (x + runlen > width)
						cnt = width - x;
					else
						cnt = runlen;
					draw_encoded_bitmap((ushort **)&fb,
						cmap[bmap[1]], cnt);
				}
				x += runlen;
			}
			bmap += 2;
		}
	}
}
#endif

__weak void fb_put_byte(uchar **fb, uchar **from)
{
	*(*fb)++ = *(*from)++;
}

#if defined(CONFIG_BMP_16BPP)
__weak void fb_put_word(uchar **fb, uchar **from)
{
	*(*fb)++ = *(*from)++;
	*(*fb)++ = *(*from)++;
}
#endif /* CONFIG_BMP_16BPP */

#define BMP_ALIGN_CENTER	0x7fff

/**
 * video_splash_align_axis() - Align a single coordinate
 *
 *- if a coordinate is 0x7fff then the image will be centred in
 *  that direction
 *- if a coordinate is -ve then it will be offset to the
 *  left/top of the centre by that many pixels
 *- if a coordinate is positive it will be used unchnaged.
 *
 * @axis:	Input and output coordinate
 * @panel_size:	Size of panel in pixels for that axis
 * @picture_size:	Size of bitmap in pixels for that axis
 */
static void video_splash_align_axis(int *axis, unsigned long panel_size,
				    unsigned long picture_size)
{
	unsigned long panel_picture_delta = panel_size - picture_size;
	unsigned long axis_alignment;

	if (*axis == BMP_ALIGN_CENTER)
		axis_alignment = panel_picture_delta / 2;
	else if (*axis < 0)
		axis_alignment = panel_picture_delta + *axis + 1;
	else
		return;

	*axis = max(0, (int)axis_alignment);
}

static void video_set_cmap(struct udevice *dev,
			   struct bmp_color_table_entry *cte, unsigned colours)
{
	struct video_priv *priv = dev_get_uclass_priv(dev);
	int i;
	ushort *cmap = priv->cmap;

	debug("%s: colours=%d\n", __func__, colours);
	for (i = 0; i < colours; ++i) {
		*cmap = ((cte->red   << 8) & 0xf800) |
			((cte->green << 3) & 0x07e0) |
			((cte->blue  >> 3) & 0x001f);
		cmap++;
		cte++;
	}
}

int video_bmp_display(struct udevice *dev, ulong bmp_image, int x, int y,
		      bool align)
{
	struct video_priv *priv = dev_get_uclass_priv(dev);
	ushort *cmap_base = NULL;
	int i, j;
	uchar *fb;
	struct bmp_image *bmp = map_sysmem(bmp_image, 0);
	uchar *bmap;
	ushort padded_width;
	unsigned long width, height, byte_width;
	unsigned long pwidth = priv->xsize;
	unsigned colours, bpix, bmp_bpix;
	struct bmp_color_table_entry *palette;
	int hdr_size;

	if (!bmp || !(bmp->header.signature[0] == 'B' &&
	    bmp->header.signature[1] == 'M')) {
		printf("Error: no valid bmp image at %lx\n", bmp_image);

		return -EINVAL;
	}

	width = get_unaligned_le32(&bmp->header.width);
	height = get_unaligned_le32(&bmp->header.height);
	bmp_bpix = get_unaligned_le16(&bmp->header.bit_count);
	hdr_size = get_unaligned_le16(&bmp->header.size);
	debug("hdr_size=%d, bmp_bpix=%d\n", hdr_size, bmp_bpix);
	palette = (void *)bmp + 14 + hdr_size;

	colours = 1 << bmp_bpix;

	bpix = VNBITS(priv->bpix);

	if (bpix != 1 && bpix != 8 && bpix != 16 && bpix != 32) {
		printf("Error: %d bit/pixel mode, but BMP has %d bit/pixel\n",
		       bpix, bmp_bpix);

		return -EINVAL;
	}

	/*
	 * We support displaying 8bpp BMPs on 16bpp LCDs
	 * and displaying 24bpp BMPs on 32bpp LCDs
	 * */
	if (bpix != bmp_bpix &&
	    !(bmp_bpix == 8 && bpix == 16) &&
	    !(bmp_bpix == 24 && bpix == 32)) {
		printf("Error: %d bit/pixel mode, but BMP has %d bit/pixel\n",
		       bpix, get_unaligned_le16(&bmp->header.bit_count));
		return -EPERM;
	}

	debug("Display-bmp: %d x %d  with %d colours, display %d\n",
	      (int)width, (int)height, (int)colours, 1 << bpix);

	if (bmp_bpix == 8)
		video_set_cmap(dev, palette, colours);

	padded_width = (width & 0x3 ? (width & ~0x3) + 4 : width);

	if (align) {
		video_splash_align_axis(&x, priv->xsize, width);
		video_splash_align_axis(&y, priv->ysize, height);
	}

	if ((x + width) > pwidth)
		width = pwidth - x;
	if ((y + height) > priv->ysize)
		height = priv->ysize - y;

	bmap = (uchar *)bmp + get_unaligned_le32(&bmp->header.data_offset);
	fb = (uchar *)(priv->fb +
		(y + height - 1) * priv->line_length + x * bpix / 8);

	switch (bmp_bpix) {
	case 1:
	case 8: {
		cmap_base = priv->cmap;
#ifdef CONFIG_VIDEO_BMP_RLE8
		u32 compression = get_unaligned_le32(&bmp->header.compression);
		debug("compressed %d %d\n", compression, BMP_BI_RLE8);
		if (compression == BMP_BI_RLE8) {
			if (bpix != 16) {
				/* TODO implement render code for bpix != 16 */
				printf("Error: only support 16 bpix");
				return -EPROTONOSUPPORT;
			}
			video_display_rle8_bitmap(dev, bmp, cmap_base, fb, x,
						  y);
			break;
		}
#endif

		if (bpix != 16)
			byte_width = width;
		else
			byte_width = width * 2;

		for (i = 0; i < height; ++i) {
			WATCHDOG_RESET();
			for (j = 0; j < width; j++) {
				if (bpix != 16) {
					fb_put_byte(&fb, &bmap);
				} else {
					*(uint16_t *)fb = cmap_base[*bmap];
					bmap++;
					fb += sizeof(uint16_t) / sizeof(*fb);
				}
			}
			bmap += (padded_width - width);
			fb -= byte_width + priv->line_length;
		}
		break;
	}
#if defined(CONFIG_BMP_16BPP)
	case 16:
		for (i = 0; i < height; ++i) {
			WATCHDOG_RESET();
			for (j = 0; j < width; j++)
				fb_put_word(&fb, &bmap);

			bmap += (padded_width - width) * 2;
			fb -= width * 2 + priv->line_length;
		}
		break;
#endif /* CONFIG_BMP_16BPP */
#if defined(CONFIG_BMP_24BPP)
	case 24:
		for (i = 0; i < height; ++i) {
			for (j = 0; j < width; j++) {
				*(fb++) = *(bmap++);
				*(fb++) = *(bmap++);
				*(fb++) = *(bmap++);
				*(fb++) = 0;
			}
			fb -= priv->line_length + width * (bpix / 8);
		}
		break;
#endif /* CONFIG_BMP_24BPP */
#if defined(CONFIG_BMP_32BPP)
	case 32:
		for (i = 0; i < height; ++i) {
			for (j = 0; j < width; j++) {
				*(fb++) = *(bmap++);
				*(fb++) = *(bmap++);
				*(fb++) = *(bmap++);
				*(fb++) = *(bmap++);
			}
			fb -= priv->line_length + width * (bpix / 8);
		}
		break;
#endif /* CONFIG_BMP_32BPP */
	default:
		break;
	};

	video_sync(dev);

	return 0;
}