git.sur5r.net Git - u-boot/blob - 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_24BPP)
 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_24BPP */
 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