Android屏幕旋转总结

转自：http://www.myexception.cn/operating-system/1452058.html

1． ProjectConifg.mk中定义宏MTK_LCM_PHYSICAL_ROTATION=180，定义此宏后，Surface Flinger会读取rotate属性对画面进行反转刷新，因此正常开机后的所有画面都可以实现翻转180度刷新

2.   LK Logo修改，包括开机第一张Logo，以及充电Logo，由于LK阶段Surface Flinger没有启动，MTK_LCM_PHYSICAL_ROTAION不会作用，实现反转显示方法有二，一，替换Logo资源，使用原有资源翻转180度的资源替换之；二，调整Frame Buffer中的刷新顺序，需要修改Path: alps/mediatek/platform/mt6589/lk; Function:show_logo

3． Kernel Logo修改，类似于LK Logo，方法有二，一，使用反转180度的Logo资源替换原有资源；二，调整Frame Buffer中的刷新顺序，请修改Path：alps/mediate/external/boot_logo_updater/boot_logo_updater; Function: main()

4．       开关机动画，请修改Path: alps/frameworks/base/cmds/bootanimation/bootanimation.cpp

Function: BootAnimation::readyToRun()

5． IPO，请修改Path: alps/mediatek/external/ipod/Bootlogo.cpp，Function: mt65xx_surface_init

6． Factory Mode，请修改Path: alps/mediatek/factory/src/miniui/Graphics.c，Function: gr_flip()

7.   Recovery Mode，请修改Path: alps/bootable/recovery/miniui/Graphics.c. Function: gr_flip()

8. 如果只有屏幕发生反转，TP不需要反转，请在tp driver中，tpd_up 与tpd_down函数报x, y坐标时 更改为 (x = LCM_WIDTH-x) ,  (y= LCM_HEIGHT-y)

9. 如果关机动画依然没有旋转，请修改Alps\frameworks\native\libs\gui\SurfaceComposerClient.cpp

10. volume up+power key进入boot mode菜单, engineer build下开机模式字符串，以及recovery mode进入选择菜单需要翻转180度，请参考下面的方案:

①. 在\alps\bootable\bootloader\lk\dev\video\cfb_console.c文件中增加以下函数：
#define SWAP32_16(x) ((((x) & 0x0000ffff) << 16) | (((x) & 0xffff0000) >> 16)) //mtk add

video_drawchars()
{

......

......
case GDF_16BIT_565RGB:
  //mtk add begin
  if (0 == strncmp(MTK_LCM_PHYSICAL_ROTATION, "180", 3))
  {
   while (count--) {
   c = *s;
   cdat = video_fontdata + (c + 1) * VIDEO_FONT_HEIGHT - 1;
   for (rows = VIDEO_FONT_HEIGHT, dest = dest0;
        rows--;
        dest += VIDEO_LINE_LEN) {
     u8 bits = *cdat--;

((u32 *) dest)[0] = SWAP32_16(SHORTSWAP32 ((video_font_draw_table16 [bits & 3] & eorx) ^ bgx));
     ((u32 *) dest)[1] = SWAP32_16(SHORTSWAP32 ((video_font_draw_table16 [bits >> 2 & 3] & eorx) ^ bgx));
     ((u32 *) dest)[2] = SWAP32_16(SHORTSWAP32 ((video_font_draw_table16 [bits >> 4 & 3] & eorx) ^ bgx));
     ((u32 *) dest)[3] = SWAP32_16(SHORTSWAP32 ((video_font_draw_table16 [bits >> 6] & eorx) ^ bgx));
    }
    dest0 += VIDEO_FONT_WIDTH * VIDEO_PIXEL_SIZE;
    s++;
   }
  }
  else
  {
  //mtk add end 
  while (count--) {
   c = *s;
   cdat = video_fontdata + c * VIDEO_FONT_HEIGHT;
   for (rows = VIDEO_FONT_HEIGHT, dest = dest0;
        rows--;
        dest += VIDEO_LINE_LEN) {
    u8 bits = *cdat++;

((u32 *) dest)[0] = SHORTSWAP32 ((video_font_draw_table16 [bits >> 6] & eorx) ^ bgx);
    ((u32 *) dest)[1] = SHORTSWAP32 ((video_font_draw_table16 [bits >> 4 & 3] & eorx) ^ bgx);
    ((u32 *) dest)[2] = SHORTSWAP32 ((video_font_draw_table16 [bits >> 2 & 3] & eorx) ^ bgx);
    ((u32 *) dest)[3] = SHORTSWAP32 ((video_font_draw_table16 [bits & 3] & eorx) ^ bgx);
   }
   dest0 += VIDEO_FONT_WIDTH * VIDEO_PIXEL_SIZE;
   s++;
  }
  }//mtk add
  break;

......

......

}

void video_puts (const char *s)
{
 int count = strlen (s);

//mtk add begin
 if (0 == strncmp(MTK_LCM_PHYSICAL_ROTATION, "180", 3))
 {
  while (count--)
  {
   video_putc_ext (*s++);
  }
 }
 else
 {
 //mtk add end
 while (count--)
  video_putc (*s++);
 }
 mt_disp_update(0, 0, CFG_DISPLAY_WIDTH, CFG_DISPLAY_HEIGHT); 
}

//mtk add begin
void video_putc_ext (const char c)
{
 static int nl = 1;

// Jett: check newline here in order to 
        //       scroll the screen immediately for the first time video_printf()
        //
        if (console_col >= CONSOLE_COLS)
          console_newline ();

switch (c) {
 case 13:  /* back to first column */
  console_cr ();
  break;

case '\n':  /* next line */
  if (console_col || (!console_col && nl))
   console_newline ();
  nl = 1;
  break;

case 9:  /* tab 8 */
  CURSOR_OFF console_col |= 0x0008;
  console_col &= ~0x0007;

if (console_col >= CONSOLE_COLS)
   console_newline ();
  break;

case 8:  /* backspace */
  console_back ();
  break;

default:  /* draw the char */
  video_putchar ((CONSOLE_COLS - console_col - 1) * VIDEO_FONT_WIDTH,
          (CONSOLE_ROWS - console_row) * VIDEO_FONT_HEIGHT,
          c);
  console_col++;

/* check for newline */
  if (console_col >= CONSOLE_COLS) {
   console_newline ();
   nl = 0;
  }
 }
CURSOR_SET}
//mtk add end

②. 在\alps\mediatek\platform\mt6572\lk\boot_mode_menu.c里面修改boot_mode_menu_select()这个函数，
void boot_mode_menu_select()
{

......

......
             else if(mtk_detect_key(MT65XX_MENU_OK_KEY))//VOL_DOWN,
             {
                 //use for OK

video_clean_screen();  //mtk add    
                 break;
             }
             else
             {
                //pass
             }
          }

......
          ......
}