Android 启动过程logo修改

这里我们是在ubuntu下进行操作我是用root用户登陆的,首先安装netpbm库

执行:apt-get install netpbm

对于Android系统最开始显示logo是在内核当中,所以首先我们要修改内核中的logo.

一.内核中相关修改

编译linux内核logo制作脚本mklogo.sh,内容如下:

[python]
#!/bin/sh
pngtopnm logo.png > linuxlogo.pnm
pnmquant 224 linuxlogo.pnm > linuxlogo224.pnm
pnmtoplainpnm linuxlogo224.pnm > logo_linux_gzsd_clut224.ppm
rm linuxlogo.pnm linuxlogo224.pnm

#!/bin/sh
pngtopnm logo.png > linuxlogo.pnm
pnmquant 224 linuxlogo.pnm > linuxlogo224.pnm
pnmtoplainpnm linuxlogo224.pnm > logo_linux_gzsd_clut224.ppm
rm linuxlogo.pnm linuxlogo224.pnm
将你选好的logo转换成png格式,命名为logo.png并与mklogo.sh放在同一路径下.
执行./mklogo.sh最后生成logo_linux_gzsd_clut224.ppm

这个命名可以自由更改,但是必须遵循logo_yourname_type这种命名方式,这里仅列举*_clut224.ppm的命名方式,其它格式的命名方式请查看drivers/video/logo/Makefile文件.

将logo_linux_gzsd_clut224.ppm文件放到内核源码下的drivers/video/logo/目录下

进入drivers/video/logo目录

1.修改Kconfig文件

增加:在endif #LOGO之前

[plain]
config LOGO_LINUX_GZSD
bool "gzsd logo"
default n

config LOGO_LINUX_GZSD
bool "gzsd logo"
default n2.修改Makefile文件

增加:

obj-$(CONFIG_LOGO_LINUX_GZSD) += logo_linux_gzsd_clut224.o

3.logo.c中函数fb_find_logo中的 if (depth >= 8)下面增加:

#ifdef CONFIG_LOGO_LINUX_GZSD
logo = &logo_linux_gzsd_clut224;
#endif

4.内核源码目录下的include/linux/linux_logo.h中增加

extern const struct linux_logo logo_linux_gzsd_clut224;

5.在终端执行make menuconfig，选上.

Device Drivers ---> Graphics support --->Bootup logo --->gzsd logo

保存退出后编译即可

6.禁止LCD控制台的光标

在内核源码目录下drivers/video/console/fbcon.c中

注释掉函数:fb_flashcursor和fbcon_cursor内的所有内容

7.让logo中屏幕中间显示:

drivers/video/fbmem.c

修改函数fb_do_show_logo如下

[cpp]
static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
                int rotate, unsigned int num)
{
    unsigned int x;
    int xoff,yoff;

    /**for central logo**/
    xoff = (info->var.xres - num * (fb_logo.logo->width + 8))>>1; //得到中间x坐标
    yoff = (info->var.yres - num * (fb_logo.logo->height + 8))>>1; //得到中间y坐标

    if (rotate == FB_ROTATE_UR) {
        for (x = 0; x < num && image->dx + image->width <= info->var.xres; x++) {
            image->dx = xoff;
            image->dy = yoff;
            info->fbops->fb_imageblit(info, image);
            image->dx += image->width + 8;
        }
    }
    else if (rotate == FB_ROTATE_UD) {
        for (x = 0; x < num && image->dx >= 0; x++) {
            info->fbops->fb_imageblit(info, image);
            image->dx -= image->width + 8;
        }
    }
    else if (rotate == FB_ROTATE_CW) {
        for (x = 0; x < num && image->dy + image->height <= info->var.yres; x++) {
            info->fbops->fb_imageblit(info, image);
            image->dy += image->height + 8;
        }
    }
    else if (rotate == FB_ROTATE_CCW) {
        for (x = 0; x < num && image->dy >= 0; x++) {
        info->fbops->fb_imageblit(info, image);
        image->dy -= image->height + 8;
        }
    }
}

static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
int rotate, unsigned int num)
{
unsigned int x;
int xoff,yoff;

/**for central logo**/
xoff = (info->var.xres - num * (fb_logo.logo->width + 8))>>1; //得到中间x坐标
yoff = (info->var.yres - num * (fb_logo.logo->height + 8))>>1; //得到中间y坐标

if (rotate == FB_ROTATE_UR) {
  for (x = 0; x < num && image->dx + image->width <= info->var.xres; x++) {
   image->dx = xoff;
   image->dy = yoff;
   info->fbops->fb_imageblit(info, image);
   image->dx += image->width + 8;
  }
}
else if (rotate == FB_ROTATE_UD) {
  for (x = 0; x < num && image->dx >= 0; x++) {
   info->fbops->fb_imageblit(info, image);
   image->dx -= image->width + 8;
  }
}
else if (rotate == FB_ROTATE_CW) {
  for (x = 0; x < num && image->dy + image->height <= info->var.yres; x++) {
   info->fbops->fb_imageblit(info, image);
   image->dy += image->height + 8;
  }
}
else if (rotate == FB_ROTATE_CCW) {
  for (x = 0; x < num && image->dy >= 0; x++) {
  info->fbops->fb_imageblit(info, image);
  image->dy -= image->height + 8;
  }
}
}重新编译即可

二.android启动后闪动画面修改:

路径:文件系统源码下的frameworks/base/core/res/assets/images/下有两张图片

android-logo-mask.png

android-logo-shine.png

修改这两张图片即可，注意请将原来的保存。

补充：移动开发 , Android ,