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1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (c) 2015 Google, Inc
4  */
5 
6 #include <common.h>
7 #include <bmp_layout.h>
8 #include <dm.h>
9 #include <mapmem.h>
10 #include <video.h>
11 #include <watchdog.h>
12 #include <asm/unaligned.h>
13 
14 #ifdef CONFIG_VIDEO_BMP_RLE8
15 #define BMP_RLE8_ESCAPE		0
16 #define BMP_RLE8_EOL		0
17 #define BMP_RLE8_EOBMP		1
18 #define BMP_RLE8_DELTA		2
19 
draw_unencoded_bitmap(ushort ** fbp,uchar * bmap,ushort * cmap,int cnt)20 static void draw_unencoded_bitmap(ushort **fbp, uchar *bmap, ushort *cmap,
21 				  int cnt)
22 {
23 	while (cnt > 0) {
24 		*(*fbp)++ = cmap[*bmap++];
25 		cnt--;
26 	}
27 }
28 
draw_encoded_bitmap(ushort ** fbp,ushort col,int cnt)29 static void draw_encoded_bitmap(ushort **fbp, ushort col, int cnt)
30 {
31 	ushort *fb = *fbp;
32 
33 	while (cnt > 0) {
34 		*fb++ = col;
35 		cnt--;
36 	}
37 	*fbp = fb;
38 }
39 
video_display_rle8_bitmap(struct udevice * dev,struct bmp_image * bmp,ushort * cmap,uchar * fb,int x_off,int y_off)40 static void video_display_rle8_bitmap(struct udevice *dev,
41 				      struct bmp_image *bmp, ushort *cmap,
42 				      uchar *fb, int x_off, int y_off)
43 {
44 	struct video_priv *priv = dev_get_uclass_priv(dev);
45 	uchar *bmap;
46 	ulong width, height;
47 	ulong cnt, runlen;
48 	int x, y;
49 	int decode = 1;
50 
51 	debug("%s\n", __func__);
52 	width = get_unaligned_le32(&bmp->header.width);
53 	height = get_unaligned_le32(&bmp->header.height);
54 	bmap = (uchar *)bmp + get_unaligned_le32(&bmp->header.data_offset);
55 
56 	x = 0;
57 	y = height - 1;
58 
59 	while (decode) {
60 		if (bmap[0] == BMP_RLE8_ESCAPE) {
61 			switch (bmap[1]) {
62 			case BMP_RLE8_EOL:
63 				/* end of line */
64 				bmap += 2;
65 				x = 0;
66 				y--;
67 				/* 16bpix, 2-byte per pixel, width should *2 */
68 				fb -= (width * 2 + priv->line_length);
69 				break;
70 			case BMP_RLE8_EOBMP:
71 				/* end of bitmap */
72 				decode = 0;
73 				break;
74 			case BMP_RLE8_DELTA:
75 				/* delta run */
76 				x += bmap[2];
77 				y -= bmap[3];
78 				/* 16bpix, 2-byte per pixel, x should *2 */
79 				fb = (uchar *)(priv->fb + (y + y_off - 1)
80 					* priv->line_length + (x + x_off) * 2);
81 				bmap += 4;
82 				break;
83 			default:
84 				/* unencoded run */
85 				runlen = bmap[1];
86 				bmap += 2;
87 				if (y < height) {
88 					if (x < width) {
89 						if (x + runlen > width)
90 							cnt = width - x;
91 						else
92 							cnt = runlen;
93 						draw_unencoded_bitmap(
94 							(ushort **)&fb,
95 							bmap, cmap, cnt);
96 					}
97 					x += runlen;
98 				}
99 				bmap += runlen;
100 				if (runlen & 1)
101 					bmap++;
102 			}
103 		} else {
104 			/* encoded run */
105 			if (y < height) {
106 				runlen = bmap[0];
107 				if (x < width) {
108 					/* aggregate the same code */
109 					while (bmap[0] == 0xff &&
110 					       bmap[2] != BMP_RLE8_ESCAPE &&
111 					       bmap[1] == bmap[3]) {
112 						runlen += bmap[2];
113 						bmap += 2;
114 					}
115 					if (x + runlen > width)
116 						cnt = width - x;
117 					else
118 						cnt = runlen;
119 					draw_encoded_bitmap((ushort **)&fb,
120 						cmap[bmap[1]], cnt);
121 				}
122 				x += runlen;
123 			}
124 			bmap += 2;
125 		}
126 	}
127 }
128 #endif
129 
fb_put_byte(uchar ** fb,uchar ** from)130 __weak void fb_put_byte(uchar **fb, uchar **from)
131 {
132 	*(*fb)++ = *(*from)++;
133 }
134 
135 #if defined(CONFIG_BMP_16BPP)
fb_put_word(uchar ** fb,uchar ** from)136 __weak void fb_put_word(uchar **fb, uchar **from)
137 {
138 	*(*fb)++ = *(*from)++;
139 	*(*fb)++ = *(*from)++;
140 }
141 #endif /* CONFIG_BMP_16BPP */
142 
143 #define BMP_ALIGN_CENTER	0x7fff
144 
145 /**
146  * video_splash_align_axis() - Align a single coordinate
147  *
148  *- if a coordinate is 0x7fff then the image will be centred in
149  *  that direction
150  *- if a coordinate is -ve then it will be offset to the
151  *  left/top of the centre by that many pixels
152  *- if a coordinate is positive it will be used unchnaged.
153  *
154  * @axis:	Input and output coordinate
155  * @panel_size:	Size of panel in pixels for that axis
156  * @picture_size:	Size of bitmap in pixels for that axis
157  */
video_splash_align_axis(int * axis,unsigned long panel_size,unsigned long picture_size)158 static void video_splash_align_axis(int *axis, unsigned long panel_size,
159 				    unsigned long picture_size)
160 {
161 	unsigned long panel_picture_delta = panel_size - picture_size;
162 	unsigned long axis_alignment;
163 
164 	if (*axis == BMP_ALIGN_CENTER)
165 		axis_alignment = panel_picture_delta / 2;
166 	else if (*axis < 0)
167 		axis_alignment = panel_picture_delta + *axis + 1;
168 	else
169 		return;
170 
171 	*axis = max(0, (int)axis_alignment);
172 }
173 
video_set_cmap(struct udevice * dev,struct bmp_color_table_entry * cte,unsigned colours)174 static void video_set_cmap(struct udevice *dev,
175 			   struct bmp_color_table_entry *cte, unsigned colours)
176 {
177 	struct video_priv *priv = dev_get_uclass_priv(dev);
178 	int i;
179 	ushort *cmap = priv->cmap;
180 
181 	debug("%s: colours=%d\n", __func__, colours);
182 	for (i = 0; i < colours; ++i) {
183 		*cmap = ((cte->red   << 8) & 0xf800) |
184 			((cte->green << 3) & 0x07e0) |
185 			((cte->blue  >> 3) & 0x001f);
186 		cmap++;
187 		cte++;
188 	}
189 }
190 
video_bmp_display(struct udevice * dev,ulong bmp_image,int x,int y,bool align)191 int video_bmp_display(struct udevice *dev, ulong bmp_image, int x, int y,
192 		      bool align)
193 {
194 	struct video_priv *priv = dev_get_uclass_priv(dev);
195 	ushort *cmap_base = NULL;
196 	int i, j;
197 	uchar *fb;
198 	struct bmp_image *bmp = map_sysmem(bmp_image, 0);
199 	uchar *bmap;
200 	ushort padded_width;
201 	unsigned long width, height, byte_width;
202 	unsigned long pwidth = priv->xsize;
203 	unsigned colours, bpix, bmp_bpix;
204 	struct bmp_color_table_entry *palette;
205 	int hdr_size;
206 
207 	if (!bmp || !(bmp->header.signature[0] == 'B' &&
208 	    bmp->header.signature[1] == 'M')) {
209 		printf("Error: no valid bmp image at %lx\n", bmp_image);
210 
211 		return -EINVAL;
212 	}
213 
214 	width = get_unaligned_le32(&bmp->header.width);
215 	height = get_unaligned_le32(&bmp->header.height);
216 	bmp_bpix = get_unaligned_le16(&bmp->header.bit_count);
217 	hdr_size = get_unaligned_le16(&bmp->header.size);
218 	debug("hdr_size=%d, bmp_bpix=%d\n", hdr_size, bmp_bpix);
219 	palette = (void *)bmp + 14 + hdr_size;
220 
221 	colours = 1 << bmp_bpix;
222 
223 	bpix = VNBITS(priv->bpix);
224 
225 	if (bpix != 1 && bpix != 8 && bpix != 16 && bpix != 32) {
226 		printf("Error: %d bit/pixel mode, but BMP has %d bit/pixel\n",
227 		       bpix, bmp_bpix);
228 
229 		return -EINVAL;
230 	}
231 
232 	/*
233 	 * We support displaying 8bpp BMPs on 16bpp LCDs
234 	 * and displaying 24bpp BMPs on 32bpp LCDs
235 	 * */
236 	if (bpix != bmp_bpix &&
237 	    !(bmp_bpix == 8 && bpix == 16) &&
238 	    !(bmp_bpix == 24 && bpix == 32)) {
239 		printf("Error: %d bit/pixel mode, but BMP has %d bit/pixel\n",
240 		       bpix, get_unaligned_le16(&bmp->header.bit_count));
241 		return -EPERM;
242 	}
243 
244 	debug("Display-bmp: %d x %d  with %d colours, display %d\n",
245 	      (int)width, (int)height, (int)colours, 1 << bpix);
246 
247 	if (bmp_bpix == 8)
248 		video_set_cmap(dev, palette, colours);
249 
250 	padded_width = (width & 0x3 ? (width & ~0x3) + 4 : width);
251 
252 	if (align) {
253 		video_splash_align_axis(&x, priv->xsize, width);
254 		video_splash_align_axis(&y, priv->ysize, height);
255 	}
256 
257 	if ((x + width) > pwidth)
258 		width = pwidth - x;
259 	if ((y + height) > priv->ysize)
260 		height = priv->ysize - y;
261 
262 	bmap = (uchar *)bmp + get_unaligned_le32(&bmp->header.data_offset);
263 	fb = (uchar *)(priv->fb +
264 		(y + height - 1) * priv->line_length + x * bpix / 8);
265 
266 	switch (bmp_bpix) {
267 	case 1:
268 	case 8: {
269 		cmap_base = priv->cmap;
270 #ifdef CONFIG_VIDEO_BMP_RLE8
271 		u32 compression = get_unaligned_le32(&bmp->header.compression);
272 		debug("compressed %d %d\n", compression, BMP_BI_RLE8);
273 		if (compression == BMP_BI_RLE8) {
274 			if (bpix != 16) {
275 				/* TODO implement render code for bpix != 16 */
276 				printf("Error: only support 16 bpix");
277 				return -EPROTONOSUPPORT;
278 			}
279 			video_display_rle8_bitmap(dev, bmp, cmap_base, fb, x,
280 						  y);
281 			break;
282 		}
283 #endif
284 
285 		if (bpix != 16)
286 			byte_width = width;
287 		else
288 			byte_width = width * 2;
289 
290 		for (i = 0; i < height; ++i) {
291 			WATCHDOG_RESET();
292 			for (j = 0; j < width; j++) {
293 				if (bpix != 16) {
294 					fb_put_byte(&fb, &bmap);
295 				} else {
296 					*(uint16_t *)fb = cmap_base[*bmap];
297 					bmap++;
298 					fb += sizeof(uint16_t) / sizeof(*fb);
299 				}
300 			}
301 			bmap += (padded_width - width);
302 			fb -= byte_width + priv->line_length;
303 		}
304 		break;
305 	}
306 #if defined(CONFIG_BMP_16BPP)
307 	case 16:
308 		for (i = 0; i < height; ++i) {
309 			WATCHDOG_RESET();
310 			for (j = 0; j < width; j++)
311 				fb_put_word(&fb, &bmap);
312 
313 			bmap += (padded_width - width) * 2;
314 			fb -= width * 2 + priv->line_length;
315 		}
316 		break;
317 #endif /* CONFIG_BMP_16BPP */
318 #if defined(CONFIG_BMP_24BPP)
319 	case 24:
320 		for (i = 0; i < height; ++i) {
321 			for (j = 0; j < width; j++) {
322 				*(fb++) = *(bmap++);
323 				*(fb++) = *(bmap++);
324 				*(fb++) = *(bmap++);
325 				*(fb++) = 0;
326 			}
327 			fb -= priv->line_length + width * (bpix / 8);
328 		}
329 		break;
330 #endif /* CONFIG_BMP_24BPP */
331 #if defined(CONFIG_BMP_32BPP)
332 	case 32:
333 		for (i = 0; i < height; ++i) {
334 			for (j = 0; j < width; j++) {
335 				*(fb++) = *(bmap++);
336 				*(fb++) = *(bmap++);
337 				*(fb++) = *(bmap++);
338 				*(fb++) = *(bmap++);
339 			}
340 			fb -= priv->line_length + width * (bpix / 8);
341 		}
342 		break;
343 #endif /* CONFIG_BMP_32BPP */
344 	default:
345 		break;
346 	};
347 
348 	video_sync(dev);
349 
350 	return 0;
351 }
352 
353