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[u-boot] / drivers / video / video_bmp.c
1 /*
2  * Copyright (c) 2015 Google, Inc
3  *
4  * SPDX-License-Identifier:     GPL-2.0+
5  */
6
7 #include <common.h>
8 #include <bmp_layout.h>
9 #include <dm.h>
10 #include <mapmem.h>
11 #include <video.h>
12 #include <watchdog.h>
13 #include <asm/unaligned.h>
14
15 #ifdef CONFIG_VIDEO_BMP_RLE8
16 #define BMP_RLE8_ESCAPE         0
17 #define BMP_RLE8_EOL            0
18 #define BMP_RLE8_EOBMP          1
19 #define BMP_RLE8_DELTA          2
20
21 static void draw_unencoded_bitmap(ushort **fbp, uchar *bmap, ushort *cmap,
22                                   int cnt)
23 {
24         while (cnt > 0) {
25                 *(*fbp)++ = cmap[*bmap++];
26                 cnt--;
27         }
28 }
29
30 static void draw_encoded_bitmap(ushort **fbp, ushort col, int cnt)
31 {
32         ushort *fb = *fbp;
33
34         while (cnt > 0) {
35                 *fb++ = col;
36                 cnt--;
37         }
38         *fbp = fb;
39 }
40
41 static void video_display_rle8_bitmap(struct udevice *dev,
42                                       struct bmp_image *bmp, ushort *cmap,
43                                       uchar *fb, int x_off, int y_off)
44 {
45         struct video_priv *priv = dev_get_uclass_priv(dev);
46         uchar *bmap;
47         ulong width, height;
48         ulong cnt, runlen;
49         int x, y;
50         int decode = 1;
51
52         debug("%s\n", __func__);
53         width = get_unaligned_le32(&bmp->header.width);
54         height = get_unaligned_le32(&bmp->header.height);
55         bmap = (uchar *)bmp + get_unaligned_le32(&bmp->header.data_offset);
56
57         x = 0;
58         y = height - 1;
59
60         while (decode) {
61                 if (bmap[0] == BMP_RLE8_ESCAPE) {
62                         switch (bmap[1]) {
63                         case BMP_RLE8_EOL:
64                                 /* end of line */
65                                 bmap += 2;
66                                 x = 0;
67                                 y--;
68                                 /* 16bpix, 2-byte per pixel, width should *2 */
69                                 fb -= (width * 2 + priv->line_length);
70                                 break;
71                         case BMP_RLE8_EOBMP:
72                                 /* end of bitmap */
73                                 decode = 0;
74                                 break;
75                         case BMP_RLE8_DELTA:
76                                 /* delta run */
77                                 x += bmap[2];
78                                 y -= bmap[3];
79                                 /* 16bpix, 2-byte per pixel, x should *2 */
80                                 fb = (uchar *)(priv->fb + (y + y_off - 1)
81                                         * priv->line_length + (x + x_off) * 2);
82                                 bmap += 4;
83                                 break;
84                         default:
85                                 /* unencoded run */
86                                 runlen = bmap[1];
87                                 bmap += 2;
88                                 if (y < height) {
89                                         if (x < width) {
90                                                 if (x + runlen > width)
91                                                         cnt = width - x;
92                                                 else
93                                                         cnt = runlen;
94                                                 draw_unencoded_bitmap(
95                                                         (ushort **)&fb,
96                                                         bmap, cmap, cnt);
97                                         }
98                                         x += runlen;
99                                 }
100                                 bmap += runlen;
101                                 if (runlen & 1)
102                                         bmap++;
103                         }
104                 } else {
105                         /* encoded run */
106                         if (y < height) {
107                                 runlen = bmap[0];
108                                 if (x < width) {
109                                         /* aggregate the same code */
110                                         while (bmap[0] == 0xff &&
111                                                bmap[2] != BMP_RLE8_ESCAPE &&
112                                                bmap[1] == bmap[3]) {
113                                                 runlen += bmap[2];
114                                                 bmap += 2;
115                                         }
116                                         if (x + runlen > width)
117                                                 cnt = width - x;
118                                         else
119                                                 cnt = runlen;
120                                         draw_encoded_bitmap((ushort **)&fb,
121                                                 cmap[bmap[1]], cnt);
122                                 }
123                                 x += runlen;
124                         }
125                         bmap += 2;
126                 }
127         }
128 }
129 #endif
130
131 __weak void fb_put_byte(uchar **fb, uchar **from)
132 {
133         *(*fb)++ = *(*from)++;
134 }
135
136 #if defined(CONFIG_BMP_16BPP)
137 __weak void fb_put_word(uchar **fb, uchar **from)
138 {
139         *(*fb)++ = *(*from)++;
140         *(*fb)++ = *(*from)++;
141 }
142 #endif /* CONFIG_BMP_16BPP */
143
144 #define BMP_ALIGN_CENTER        0x7fff
145
146 /**
147  * video_splash_align_axis() - Align a single coordinate
148  *
149  *- if a coordinate is 0x7fff then the image will be centred in
150  *  that direction
151  *- if a coordinate is -ve then it will be offset to the
152  *  left/top of the centre by that many pixels
153  *- if a coordinate is positive it will be used unchnaged.
154  *
155  * @axis:       Input and output coordinate
156  * @panel_size: Size of panel in pixels for that axis
157  * @picture_size:       Size of bitmap in pixels for that axis
158  */
159 static void video_splash_align_axis(int *axis, unsigned long panel_size,
160                                     unsigned long picture_size)
161 {
162         unsigned long panel_picture_delta = panel_size - picture_size;
163         unsigned long axis_alignment;
164
165         if (*axis == BMP_ALIGN_CENTER)
166                 axis_alignment = panel_picture_delta / 2;
167         else if (*axis < 0)
168                 axis_alignment = panel_picture_delta + *axis + 1;
169         else
170                 return;
171
172         *axis = max(0, (int)axis_alignment);
173 }
174
175 static void video_set_cmap(struct udevice *dev,
176                            struct bmp_color_table_entry *cte, unsigned colours)
177 {
178         struct video_priv *priv = dev_get_uclass_priv(dev);
179         int i;
180         ushort *cmap = priv->cmap;
181
182         debug("%s: colours=%d\n", __func__, colours);
183         for (i = 0; i < colours; ++i) {
184                 *cmap = ((cte->red   << 8) & 0xf800) |
185                         ((cte->green << 3) & 0x07e0) |
186                         ((cte->blue  >> 3) & 0x001f);
187                 cmap++;
188                 cte++;
189         }
190 }
191
192 int video_bmp_display(struct udevice *dev, ulong bmp_image, int x, int y,
193                       bool align)
194 {
195         struct video_priv *priv = dev_get_uclass_priv(dev);
196         ushort *cmap_base = NULL;
197         int i, j;
198         uchar *fb;
199         struct bmp_image *bmp = map_sysmem(bmp_image, 0);
200         uchar *bmap;
201         ushort padded_width;
202         unsigned long width, height, byte_width;
203         unsigned long pwidth = priv->xsize;
204         unsigned colours, bpix, bmp_bpix;
205         struct bmp_color_table_entry *palette;
206         int hdr_size;
207
208         if (!bmp || !(bmp->header.signature[0] == 'B' &&
209             bmp->header.signature[1] == 'M')) {
210                 printf("Error: no valid bmp image at %lx\n", bmp_image);
211
212                 return -EINVAL;
213         }
214
215         width = get_unaligned_le32(&bmp->header.width);
216         height = get_unaligned_le32(&bmp->header.height);
217         bmp_bpix = get_unaligned_le16(&bmp->header.bit_count);
218         hdr_size = get_unaligned_le16(&bmp->header.size);
219         debug("hdr_size=%d, bmp_bpix=%d\n", hdr_size, bmp_bpix);
220         palette = (void *)bmp + 14 + hdr_size;
221
222         colours = 1 << bmp_bpix;
223
224         bpix = VNBITS(priv->bpix);
225
226         if (bpix != 1 && bpix != 8 && bpix != 16 && bpix != 32) {
227                 printf("Error: %d bit/pixel mode, but BMP has %d bit/pixel\n",
228                        bpix, bmp_bpix);
229
230                 return -EINVAL;
231         }
232
233         /*
234          * We support displaying 8bpp BMPs on 16bpp LCDs
235          * and displaying 24bpp BMPs on 32bpp LCDs
236          * */
237         if (bpix != bmp_bpix &&
238             !(bmp_bpix == 8 && bpix == 16) &&
239             !(bmp_bpix == 24 && bpix == 32)) {
240                 printf("Error: %d bit/pixel mode, but BMP has %d bit/pixel\n",
241                        bpix, get_unaligned_le16(&bmp->header.bit_count));
242                 return -EPERM;
243         }
244
245         debug("Display-bmp: %d x %d  with %d colours, display %d\n",
246               (int)width, (int)height, (int)colours, 1 << bpix);
247
248         if (bmp_bpix == 8)
249                 video_set_cmap(dev, palette, colours);
250
251         padded_width = (width & 0x3 ? (width & ~0x3) + 4 : width);
252
253         if (align) {
254                 video_splash_align_axis(&x, priv->xsize, width);
255                 video_splash_align_axis(&y, priv->ysize, height);
256         }
257
258         if ((x + width) > pwidth)
259                 width = pwidth - x;
260         if ((y + height) > priv->ysize)
261                 height = priv->ysize - y;
262
263         bmap = (uchar *)bmp + get_unaligned_le32(&bmp->header.data_offset);
264         fb = (uchar *)(priv->fb +
265                 (y + height - 1) * priv->line_length + x * bpix / 8);
266
267         switch (bmp_bpix) {
268         case 1:
269         case 8: {
270                 cmap_base = priv->cmap;
271 #ifdef CONFIG_VIDEO_BMP_RLE8
272                 u32 compression = get_unaligned_le32(&bmp->header.compression);
273                 debug("compressed %d %d\n", compression, BMP_BI_RLE8);
274                 if (compression == BMP_BI_RLE8) {
275                         if (bpix != 16) {
276                                 /* TODO implement render code for bpix != 16 */
277                                 printf("Error: only support 16 bpix");
278                                 return -EPROTONOSUPPORT;
279                         }
280                         video_display_rle8_bitmap(dev, bmp, cmap_base, fb, x,
281                                                   y);
282                         break;
283                 }
284 #endif
285
286                 if (bpix != 16)
287                         byte_width = width;
288                 else
289                         byte_width = width * 2;
290
291                 for (i = 0; i < height; ++i) {
292                         WATCHDOG_RESET();
293                         for (j = 0; j < width; j++) {
294                                 if (bpix != 16) {
295                                         fb_put_byte(&fb, &bmap);
296                                 } else {
297                                         *(uint16_t *)fb = cmap_base[*bmap];
298                                         bmap++;
299                                         fb += sizeof(uint16_t) / sizeof(*fb);
300                                 }
301                         }
302                         bmap += (padded_width - width);
303                         fb -= byte_width + priv->line_length;
304                 }
305                 break;
306         }
307 #if defined(CONFIG_BMP_16BPP)
308         case 16:
309                 for (i = 0; i < height; ++i) {
310                         WATCHDOG_RESET();
311                         for (j = 0; j < width; j++)
312                                 fb_put_word(&fb, &bmap);
313
314                         bmap += (padded_width - width) * 2;
315                         fb -= width * 2 + priv->line_length;
316                 }
317                 break;
318 #endif /* CONFIG_BMP_16BPP */
319 #if defined(CONFIG_BMP_24BMP)
320         case 24:
321                 for (i = 0; i < height; ++i) {
322                         for (j = 0; j < width; j++) {
323                                 *(fb++) = *(bmap++);
324                                 *(fb++) = *(bmap++);
325                                 *(fb++) = *(bmap++);
326                                 *(fb++) = 0;
327                         }
328                         fb -= priv->line_length + width * (bpix / 8);
329                 }
330                 break;
331 #endif /* CONFIG_BMP_24BMP */
332 #if defined(CONFIG_BMP_32BPP)
333         case 32:
334                 for (i = 0; i < height; ++i) {
335                         for (j = 0; j < width; j++) {
336                                 *(fb++) = *(bmap++);
337                                 *(fb++) = *(bmap++);
338                                 *(fb++) = *(bmap++);
339                                 *(fb++) = *(bmap++);
340                         }
341                         fb -= priv->line_length + width * (bpix / 8);
342                 }
343                 break;
344 #endif /* CONFIG_BMP_32BPP */
345         default:
346                 break;
347         };
348
349         video_sync(dev);
350
351         return 0;
352 }
353