src/lib/bootsplash.c

/* SPDX-License-Identifier: GPL-2.0-only */

#include <cbfs.h>
#include <vbe.h>
#include <console/console.h>
#include <endian.h>
#include <bootsplash.h>
#include <stdlib.h>

#include "jpeg.h"


void set_bootsplash(unsigned char *framebuffer, unsigned int x_resolution,
		    unsigned int y_resolution, unsigned int bytes_per_line,
		    unsigned int fb_resolution)
{
	printk(BIOS_INFO, "Setting up bootsplash in %dx%d@%d\n", x_resolution, y_resolution,
	       fb_resolution);
	struct jpeg_decdata *decdata;
	unsigned char *jpeg = cbfs_map("bootsplash.jpg", NULL);
	if (!jpeg) {
		printk(BIOS_ERR, "Could not find bootsplash.jpg\n");
		return;
	}

	int image_width, image_height;
	jpeg_fetch_size(jpeg, &image_width, &image_height);

	printk(BIOS_DEBUG, "Bootsplash image resolution: %dx%d\n", image_width, image_height);

	if (image_width > x_resolution || image_height > y_resolution) {
		printk(BIOS_NOTICE, "Bootsplash image can't fit framebuffer.\n");
		cbfs_unmap(jpeg);
		return;
	}

	/* center image: */
	framebuffer += (y_resolution - image_height) / 2 * bytes_per_line +
			(x_resolution - image_width) / 2 * (fb_resolution / 8);

	decdata = malloc(sizeof(*decdata));
	int ret = jpeg_decode(jpeg, framebuffer, image_width, image_height,
			      bytes_per_line, fb_resolution, decdata);
	free(decdata);
	cbfs_unmap(jpeg);
	if (ret != 0) {
		printk(BIOS_ERR, "Bootsplash could not be decoded. jpeg_decode returned %d.\n",
		       ret);
		return;
	}
	printk(BIOS_INFO, "Bootsplash loaded\n");
}