uh

splash_screen.c

#include "utils.h"
#include "timers.h"
#include "splash_screen.h"
#include "sd_utils.h"
#include "lib/printk.h"
#include "display/video_fb.h"
#include "console.h"

struct BMP {
  char Type[2];           //File type. Set to "BM".
  unsigned long Size;     //Size in BYTES of the file.
  unsigned long Reserved;      //Reserved. Set to zero.
  unsigned long OffSet;   //Offset to the data.
  unsigned long headsize; //Size of rest of header. Set to 40.
  unsigned long Width;     //Width of bitmap in pixels.
  unsigned long Height;     //  Height of bitmap in pixels.
  unsigned int  Planes;    //Number of Planes. Set to 1.
  unsigned int  BitsPerPixel;       //Number of Bits per pixels.
  unsigned long Compression;   //Compression. Usually set to 0.
  unsigned long SizeImage;  //Size in bytes of the bitmap.
  unsigned long XPixelsPreMeter;     //Horizontal pixels per meter.
  unsigned long YPixelsPreMeter;     //Vertical pixels per meter.
  unsigned long ColorsUsed;   //Number of colors used.
  unsigned long ColorsImportant;  //Number of "important" colors.
};

void display_splash_screen_bmp(const char *custom_splash_path) {
    unsigned char *splash_screen = g_default_splash_screen;
    if (custom_splash_path != NULL && custom_splash_path[0] != '\x00') {
        if (!read_sd_file(splash_screen, sizeof(g_default_splash_screen), custom_splash_path)) {
            printk("Error: Failed to read custom splash screen from %s!\n", custom_splash_path);
            generic_panic();
        }
    }

    BMP splash;
    memcpy(*splash, splash_screen, sizeof(splash));
    
    if (!splash.Type[0] == "B" || !splash.Type[1] == "M") {
      printk("Error: Not a real BMP!");
      generic_panic();
    }
  
    u32 imagedata = &splashscreen + &splash.Offset;

    u32* framebuf = *console_get_framebuffer();

    // framebuffer is in RGBA
    // bmp is in BRGA
    u32 x, y;
    for (y=0;y<720;y++){
      for (x=0;x<1280;x++){
        pos = (1280 * 720) - (y * 720) + x;
        framebuf[pos+2] = imageptr[pos*4+0]; //red
        framebuf[pos+1] = imageptr[pos*4+1]; //green
        framebuf[pos] = imageptr[pos*4+2]; //blue
        framebuf[pos+3] = imageptr[pos*4+3]; //alpha
      }
    }

    /* Display the splash screen for three seconds. */
    wait(3000000);
}