android屏幕旋转在framework中的修改。

Android 竖屏启动

1）kernel 竖屏
选中：
make menuconfig ---> Device Drivers ---> Graphics support ---> Console display driver support ---> Framebuffer Console Rotation

make menuconfig
---> Boot options 启动参数修改为：console=ttySAC2,115200 init=/linuxrc fbcon=rotate:1

2）Android OS 竖屏
文件：frameworks/base/libs/surfaceflinger/SurfaceFlinger.cpp

void GraphicPlane::setDisplayHardware(DisplayHardware *hw)
{
mHw = hw;

// initialize the display orientation transform.
// it's a constant that should come from the display driver.
//int displayOrientation = ISurfaceComposer::eOrientationDefault; // 这行被注释掉
int displayOrientation = ISurfaceComposer::eOrientation90; // 加上这行
char property[PROPERTY_VALUE_MAX];
if (property_get("ro.sf.hwrotation", property, NULL) > 0) {
//displayOrientation
switch (atoi(property)) {
case 90:
displayOrientation = ISurfaceComposer::eOrientation90;
break;
case 270:
displayOrientation = ISurfaceComposer::eOrientation270;
break;
}
}

const float w = hw->getWidth();
const float h = hw->getHeight();
GraphicPlane::orientationToTransfrom(displayOrientation, w, h,
&mDisplayTransform);
if (displayOrientation & ISurfaceComposer::eOrientationSwapMask) {
mDisplayWidth = h;
mDisplayHeight = w;
} else {
mDisplayWidth = w;
mDisplayHeight = h;
}

setOrientation(ISurfaceComposer::eOrientationDefault);
}

触摸：

#else /* !CONFIG_CPU_S5PV210_EVT1 */
ts->yp += S3C_ADCDAT0_XPDATA_MASK_12BIT - (data0 & S3C_ADCDAT0_XPDATA_MASK_12BIT);
#endif /* !CONFIG_CPU_S5PV210_EVT1 */
ts->xp += S3C_ADCDAT1_YPDATA_MASK_12BIT - (data1 & S3C_ADCDAT1_YPDATA_MASK_12BIT);
#endif /* CONFIG_TOUCHSCREEN_NEW */

下面的搞死我了，不知道怎么改，

----------------------------------------------------------------------------------------------------------------------------------------
平板电脑一般是默认横屏，竖屏的APP程序，会自动旋转90°，由于是顺时针转90°，需要改为逆时针转90°；也就是要把portrait改逆时针转90°，修改点如下：

PhoneWindowManager.java(\\192.168.1.4\opt\android_froyo_smdk\frameworks\policies\base\phone\com\android\internal\policy\impl)

public int rotationForOrientationLw(int orientation, int lastRotation,

boolean displayEnabled) {

if (mPortraitRotation < 0) {

// Initialize the rotation angles for each orientation once.

Display d =((WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE))

.getDefaultDisplay();

if (d.getWidth() > d.getHeight()) {

mPortraitRotation =Surface.ROTATION_270;//Surface.ROTATION_90;

mLandscapeRotation =Surface.ROTATION_0;

} else {

mPortraitRotation =Surface.ROTATION_0;

mLandscapeRotation =Surface.ROTATION_270;//Surface.ROTATION_90;

}

一下是参考文章------------------------------------------------------------------------------------------------------

本行实现以后才发现，google在1.5到2.2这个过程中改进了很多，1.5修改竖屏比较麻烦，而2.2是相当的容易！
其实基本上google将之前版本的默认为竖屏的做法进行了改进，不需要再花费更多力气在屏幕的默认横竖切换上面。1.还是kernel竖屏，可以显示到屏幕出现"A N D R O I D"字样
启动参数里加入fbcon=rotate:1 (0:正常屏; 1:顺时钟转90度; 2:转180度; 3:顺时钟转270度;)
最后生成的autoconf.h里有类似项：
#define CONFIG_CMDLINE "console=ttySAC0,115200 fbcon=rotate:1"此项的解析在$(kernel)/drivers/video/console/fbcon.c
static int __init fb_console_setup(char *this_opt);
只是去初始化变量initial_rotation，然后initial_rotation会传递给其他需要的结构。
要选上：Device Drivers -> Graphics support -> Console display driver support ->Framebuffer Console support -> Framebuffer Console Rotation
注意：参考$(kernel)/documentation/fb/fbcon.txt2.android OS旋转屏幕
froyo中已经相当容易，仅修改一处：
frameworks/base/libs/surfaceflinger/SurfaceFlinger.cpp
void GraphicPlane::setDisplayHardware(DisplayHardware *hw)
{
mHw = hw; // initialize the display orientation transform.
// it's a constant that should come from the display driver.
// int displayOrientation = ISurfaceComposer::eOrientationDefault;
int displayOrientation = ISurfaceComposer::eOrientation90; //jeff.
。。。
}
或者只在init.rc中增加一项：
setprop ro.sf.hwrotation 90就这么简单的一修改，就可以全程竖屏显示了！

本文原创，来自http://blog.csdn.net/knock，转载请保留本行

-----------------------------------------------------------------------------------------------------------------

屏是LANDSCAPE的，要让它默认显示为PORTRAIT.

1.kernel里要旋转FrameBuffer.
启动参数里加入fbcon=rotate:1 (0:正常屏; 1:顺时钟转90度; 2:转180度; 3:顺时钟转270度;)
最后生成的autoconf.h里有类似项：
#define CONFIG_CMDLINE "console=ttySAC0,115200 fbcon=rotate:1"

此项的解析在$(kernel)/drivers/video/console/fbcon.c
static int __init fb_console_setup(char *this_opt);
只是去初始化变量initial_rotation，然后initial_rotation会传递给其他需要的结构。
注意：参考$(kernel)/documentation/fb/fbcon.txt

2.android OS旋转屏幕
系统默认是针对竖屏的，而MID使用的是横屏，所以需要做一个转换的动作。
PORTRAIT LANDSCAPE <------屏幕显示方式
ROTATION_0 ROTATION_90
ROTATION_90 ROTATION_180
ROTATION_180 ROTATION_270
ROTATION_270 ROTATION_0

而source code里对ROTATION_180和ROTATION_270的处理比较少，只在sensor和KeyQueue部分，所以如果只是要让系统显示为竖屏，将android中的Surface.ROTATION_0改为Surface.ROTATION_90，而Surface.ROTATION_90改为Surface.ROTATION_0。这样，启动后的屏幕就是竖屏的了。
改动后，启动时还是LANDSCAPE显示的，进入HOME也是，很快就会自动旋转到PORTRAIT模式，这是由于
$(cupcake)/frameworks/base/services/java/com/android/server/WindowManagerService.java
中enableScreenAfterBoot()->performEnableScreen()->mPolicy.enableScreenAfterBoot(), mPolicy为父类指针，可以指向
PhoneWindowManager或者MidWindowManager，由配置文件$(cupcake)/build/target/product/core.mk中
PRODUCT_POLICY := android.policy_phone
//PRODUCT_POLICY := android.policy_mid
来指定。
PhoneWindowManager::enableScreenAfterBoot()->updateRotation(Surface.FLAGS_ORIENTATION_ANIMATION_DISABLE)->mWindowManager.setRotation()完成设置旋转并清除LOGO.

3.启动过程中竖屏
启动过程中，默认是按照屏的width和height显示的，不会旋转，要使它显示logo时就是竖屏的，也就是旋转90度，需要做如下工作：
$(cupcake)/frameworks/base/libs/surfaceflinger/SurfaceFlinger.cpp
status_t SurfaceFlinger::readyToRun()中
//const uint32_t w = hw.getWidth();
//const uint32_t h = hw.getHeight();
//swap w&h for portrait display in landscape panel. jeff.
const uint32_t h = hw.getWidth();
const uint32_t w = hw.getHeight();
交换一下width和height，这样后面用OpenGL创建的ViewPort形状就是竖的了。修改后面的函数参数也可以，不过太多了，交换一下省事。但是怎么让这个竖的viewport旋转90度呢？这里就要用到GraphicPlane::mGlobalTransform这个Transform了。它指示当前最终要旋转的结果。所以要在创建GraphicPlane时初始化mGlobalTransform为旋转90度。
GraphicPlane::GraphicPlane()
: mHw(0)
{
//add by jeff. for default rotate angel 90
mOrientationTransform.reset();
mOrientation = ISurfaceComposer::eOrientation90;
mGlobalTransform = mOrientationTransform * mTransform;
}
此段从status_t GraphicPlane::setOrientation(int orientation)复制过来，注意修改mGlobalTransform：
if (orientation == ISurfaceComposer::eOrientation90) { //ISurfaceComposer::eOrientationDefault //jeff
// make sure the default orientation is optimal
mOrientationTransform.reset();
mOrientation = orientation;
//mGlobalTransform = mTransform;
mGlobalTransform = mOrientationTransform * mTransform; //jeff
return NO_ERROR;
}
注意mOrientationTransform.reset();要修改为默认旋转90度。参照status_t GraphicPlane::orientationToTransfrom
中的设置，修改为：
void Transform::reset() {
mTransform.reset();
mType = 0;
set(0,-1,1,0); //jeff
set(800,0);
}
参考：
status_t GraphicPlane::orientationToTransfrom(
int orientation, int w, int h, Transform* tr)
{
float a, b, c, d, x, y;
switch (orientation) {
case ISurfaceComposer::eOrientationDefault:
a=1; b=0; c=0; d=1; x=0; y=0;
break;
case ISurfaceComposer::eOrientation90:
a=0; b=-1; c=1; d=0; x=w; y=0;
break;
case ISurfaceComposer::eOrientation180:
a=-1; b=0; c=0; d=-1; x=w; y=h;
break;
case ISurfaceComposer::eOrientation270:
a=0; b=1; c=-1; d=0; x=0; y=h;
break;
default:
return BAD_VALUE;
}
tr->set(a, b, c, d);
tr->set(x, y);
return NO_ERROR;
}
修改之后，默认就是竖屏（旋转90度）显示了。

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