Android 啟動過程logo修改

這裡我們是在ubuntu下進行操作我是用root用戶登陸的,首先安裝netpbm庫

執行:apt-get install netpbm

對於Android系統最開始顯示logo是在內核當中,所以首先我們要修改內核中的logo.

一.內核中相關修改

編譯linux內核logo制作腳本mklogo.sh,內容如下:

[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
將你選好的logo轉換成png格式,命名為logo.png並與mklogo.sh放在同一路徑下.
執行./mklogo.sh最後生成logo_linux_gzsd_clut224.ppm

這個命名可以自由更改,但是必須遵循logo_yourname_type這種命名方式,這裡僅列舉*_clut224.ppm的命名方式,其它格式的命名方式請查看drivers/video/logo/Makefile文件.

將logo_linux_gzsd_clut224.ppm文件放到內核源碼下的drivers/video/logo/目錄下

進入drivers/video/logo目錄

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中函數fb_find_logo中的 if (depth >= 8)下面增加:

#ifdef CONFIG_LOGO_LINUX_GZSD
                logo = &logo_linux_gzsd_clut224;
#endif

4.內核源碼目錄下的include/linux/linux_logo.h中增加

extern const struct linux_logo logo_linux_gzsd_clut224;

5.在終端執行make menuconfig,選上.

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

保存退出後編譯即可

6.禁止LCD控制臺的光標

在內核源碼目錄下drivers/video/console/fbcon.c中

註釋掉函數:fb_flashcursor和fbcon_cursor內的所有內容

7.讓logo中屏幕中間顯示:

drivers/video/fbmem.c

修改函數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; //得到中間x坐標  
    yoff = (info->var.yres – num * (fb_logo.logo->height + 8))>>1; //得到中間y坐標  
 
    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; //得到中間x坐標
 yoff = (info->var.yres – num * (fb_logo.logo->height + 8))>>1; //得到中間y坐標

 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;
  }
 }
}重新編譯即可

二.android啟動後閃動畫面修改:

路徑:文件系統源碼下的frameworks/base/core/res/assets/images/下有兩張圖片

android-logo-mask.png

android-logo-shine.png

修改這兩張圖片即可,註意請將原來的保存。

 

 

 

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