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
   9 #include "jpeg.h"
  10
  11
  12 void set_bootsplash(unsigned char *framebuffer, unsigned int x_resolution,
  13                     unsigned int y_resolution, unsigned int bytes_per_line,
  14                     unsigned int fb_resolution)
  15 {
  16         if ((x_resolution > INT_MAX) || (y_resolution) > INT_MAX) {
  17                 printk(BIOS_ERR, "Display resolution way too large.\n");
  18                 return;
  19         }
  20         int xres = x_resolution, yres = y_resolution;
  21         printk(BIOS_INFO, "Setting up bootsplash in %dx%d@%d\n", x_resolution, y_resolution,
  22                fb_resolution);
  23         size_t filesize;
  24         unsigned char *jpeg = cbfs_map("bootsplash.jpg", &filesize);
  25         if (!jpeg) {
  26                 printk(BIOS_ERR, "Could not find bootsplash.jpg\n");
  27                 return;
  28         }
  29
  30         unsigned int image_width, image_height;
  31         const char *err = jpeg_fetch_size(jpeg, filesize, &image_width, &image_height);
  32         if (err != NULL) {
  33                 printk(BIOS_ERR, "Could not parse bootsplash.jpg: %s\n", err);
  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         err = jpeg_decode(jpeg, filesize, framebuffer, image_width, image_height,
  50                           bytes_per_line, fb_resolution);
  51         cbfs_unmap(jpeg);
  52         if (err != NULL) {
  53                 printk(BIOS_ERR, "Could not decode bootsplash.jpg: %s\n", err);
  54                 return;
  55         }
  56         printk(BIOS_INFO, "Bootsplash loaded\n");
  57 }