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#pngtopnm linuxlogo.png> linuxlogo.pnm  //生成ppm
#pnmquant 224 linuxlogo.pnm > linuxlogo224.pnm//转换成224颜色
#pnmtoplainpnm linuxlogo224.pnm > logo_linux_clut224.ppm //转换成ascii格式

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pngtopnm $1 > linuxlogo.pnm        //$1为参数，这样不用每次改图片名称，后几步为执行过程
pnmquant 224 linuxlogo.pnm > linuxlogo224.pnm
pnmtoplainpnm linuxlogo224.pnm > logo_linux_clut224.ppm
#删除过程中生成不需要的文件
rm -rf ./linuxlogo.pnm  ./linuxlogo224.pnm
rm -rf ./linuxlogo.pnm  ./linuxlogo224.pnm

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convert $1 linuxlogo.png  //把bmp图片转换成png格式，下面过程和png格式图片相同
pngtopnm linuxlogo.png > linuxlogo.pnm
pnmquant 224 linuxlogo.pnm > linuxlogo224.pnm
pnmtoplainpnm linuxlogo224.pnm > logo_linux_clut224.ppm
rm -rf ./linuxlogo.pnm  ./linuxlogo224.pnm ./linuxlogo.png

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convert -depth 8 android_logo.pngrgb:android_logo.raw

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rgb2565 -rle < android_logo.raw >initlogo.rle

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convert -depth 8 $1 rgb:logo.raw//转换成raw文件
rgb2565 -rle <logo.raw> initlogo.rle//生成我们要的rle文件，注意：rbg2565在android/out/host/linux-x86/bin目录拷过来。

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#define INIT_IMAGE_FILE "/initlogo.rle"

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400 800 18
p 1 0 part0#400 800 为图片的分辨率 400*800
#18为每秒显示图片的张数，也就是18fps/S
#p代表定义一个部分。
#p后面的第一个数是重复播放这一部分次数。如果这个数为0，就无限循环播放
#p后面第二个数是播放下一个部分前的延迟帧数
#字符串定义了加载文件的路径

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static int console_init_action(int nargs, char **args)
{………………if( load_565rle_image(INIT_IMAGE_FILE) ) {//1、显示第二张logo;fd = open("/dev/tty0", O_WRONLY);if (fd >= 0) {//2、如果不行，显示“android”字样；const char *msg;msg = "n""n""n""n""n""n""n"  // console is 40 cols x 30 lines"n""n""n""n""n""n""n""             A N D R O I D ";write(fd, msg, strlen(msg));close(fd);}}return 0;
}

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#define INIT_IMAGE_FILE "/initlogo.rle"
int load_565rle_image( char *file_name );

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int load_565rle_image(char *fn)
{struct FB fb;struct stat s;unsigned short *data, *ptr;unsigned count, max;int fd;if (vt_set_mode(1))
//1、这部分对fb的操作，这里就不详细说了；return -1;fd = open(fn, O_RDONLY);if (fd < 0) {ERROR("cannot open '%s'n", fn);goto fail_restore_text;}if (fstat(fd, &s) < 0) {goto fail_close_file;}data = mmap(0, s.st_size, PROT_READ, MAP_SHARED, fd, 0);if (data == MAP_FAILED)goto fail_close_file;if (fb_open(&fb))goto fail_unmap_data;max = fb_width(&fb) * fb_height(&fb);//2、得到屏幕最大的缓存空间；ptr = data;count = s.st_size;if (fb_bpp(&fb) == 16) {//3、16bppuint16_t *bits = (uint16_t*) fb.bits;while (count > 3) {unsigned n = ptr[0];if (n > max)break;android_memset16(bits, ptr[1], n << 1);bits += n;max -= n;ptr += 2;count -= 4;}} else if (fb_bpp(&fb) == 32) {//4、32bppuint32_t *bits = fb.bits;//32bpp这部分代码加入的while (count > 3) {unsigned n = ptr[0];if (n > max)break;uint32_t data32 = (0xff << 24) | (((ptr[1]>>11)&0x1f)<<19) | (((ptr[1]>>5)&0x3f)<<10) | (( ptr[1]&0x1f)<<3);android_memset32(bits, data32, n << 2);bits += n;max -= n;ptr += 2;count -= 4;}}munmap(data, s.st_size);
//5、显示完成，释放内存；fb_update(&fb);fb_close(&fb);close(fd);unlink(fn);return 0;
fail_unmap_data:munmap(data, s.st_size);
fail_close_file:close(fd);
fail_restore_text:vt_set_mode(0);return -1;
}

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   max = fb_width(&fb) * fb_height(&fb);

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    if (fb_bpp(&fb) == 16) {uint16_t *bits = (uint16_t*) fb.bits;while (count > 3) {unsigned n = ptr[0];if (n > max)break;android_memset16(bits, ptr[1], n << 1);bits += n;max -= n;ptr += 2;count -= 4;}

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if (fb_bpp(&fb) == 32) {uint32_t *bits = fb.bits;while (count > 3) {unsigned n = ptr[0];if (n > max)break;uint32_t data32 = (0xff << 24) | (((ptr[1]>>11)&0x1f)<<19) | (((ptr[1]>>5)&0x3f)<<10) | (( ptr[1]&0x1f)<<3);android_memset32(bits, data32, n << 2);bits += n;max -= n;ptr += 2;count -= 4;}