src/lib/bootsplash.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <cbfs.h>
   4 #include <vbe.h>
   5 #include <console/console.h>
   6 #include <endian.h>
   7 #include <bootsplash.h>
   8 #include <stdlib.h>
   9
  10 #include "jpeg.h"
  11
  12
  13 void set_bootsplash(unsigned char *framebuffer, unsigned int x_resolution,
  14                     unsigned int y_resolution, unsigned int bytes_per_line,
  15                     unsigned int fb_resolution)
  16 {
  17         if ((x_resolution > INT_MAX) || (y_resolution) > INT_MAX) {
  18                 printk(BIOS_ERR, "Display resolution way too large.\n");
  19                 return;
  20         }
  21         int xres = x_resolution, yres = y_resolution;
  22         printk(BIOS_INFO, "Setting up bootsplash in %dx%d@%d\n", x_resolution, y_resolution,
  23                fb_resolution);
  24         size_t filesize;
  25         unsigned char *jpeg = cbfs_map("bootsplash.jpg", &filesize);
  26         if (!jpeg) {
  27                 printk(BIOS_ERR, "Could not find bootsplash.jpg\n");
  28                 return;
  29         }
  30
  31         unsigned int image_width, image_height;
  32         if (jpeg_fetch_size(jpeg, filesize, &image_width, &image_height) != 0) {
  33                 printk(BIOS_ERR, "Could not parse bootsplash.jpg\n");
  34                 return;
  35         }
  36
  37         printk(BIOS_DEBUG, "Bootsplash image resolution: %dx%d\n", image_width, image_height);
  38
  39         if (image_width > xres || image_height > yres) {
  40                 printk(BIOS_NOTICE, "Bootsplash image can't fit framebuffer.\n");
  41                 cbfs_unmap(jpeg);
  42                 return;
  43         }
  44
  45         /* center image: */
  46         framebuffer += (yres - image_height) / 2 * bytes_per_line
  47                        + (xres - image_width) / 2 * (fb_resolution / 8);
  48
  49         int ret = jpeg_decode(jpeg, filesize, framebuffer, image_width, image_height,
  50                               bytes_per_line, fb_resolution);
  51         cbfs_unmap(jpeg);
  52         if (ret != 0) {
  53                 printk(BIOS_ERR, "Bootsplash could not be decoded. jpeg_decode returned %d.\n",
  54                        ret);
  55                 return;
  56         }
  57         printk(BIOS_INFO, "Bootsplash loaded\n");
  58 }