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拆解步骤

1、app 强制横屏显示，无视 android:screenorientation="portrait" 属性

2、屏幕触摸坐标修改为横屏

3、开机动画横屏

4、开机logo、关机充电动画横屏

5、recoveryui 横屏

上代码

1、app 强制横屏显示

修改 rotationfororientationlw(), 默认返回 270

frameworks\base\services\core\java\com\android\server\policy\phonewindowmanager.java

 @override
    public int rotationfororientationlw(int orientation, int lastrotation, boolean defaultdisplay) {
        ....

        synchronized (mlock) {
        ...

        default:
                    // for user, unspecified, nosensor, sensor and full_sensor,
                    // just return the preferred orientation we already calculated.
                    if (preferredrotation >= 0) {
                        return preferredrotation;
                    }
                    
                    // return surface.rotation_0;
                    return surface.rotation_270;//cczheng add for land scap
            }
        }
  }

activity 默认强制属性为 screen_orientation_landscape

frameworks\base\services\core\java\com\android\server\wm\windowmanagerservice.java

boolean updateorientationfromapptokenslocked(int displayid, boolean forceupdate) {
        long ident = binder.clearcallingidentity();
        try {
            final displaycontent dc = mroot.getdisplaycontent(displayid);
            // final int req = dc.getorientation();
            int req = android.content.pm.activityinfo.screen_orientation_landscape;//cczheng add for land scap
            if (req != dc.getlastorientation() || forceupdate) {
                if (debug_orientation) {
                    slog.v(tag, "updateorientation: req= " + req + ", mlastorientation= "
                        + dc.getlastorientation(), new throwable("updateorientation"));
                }
                dc.setlastorientation(req);
                //send a message to policy indicating orientation change to take
                //action like disabling/enabling sensors etc.,
                // todo(multi-display): implement policy for secondary displays.
                if (dc.isdefaultdisplay) {
                    mpolicy.setcurrentorientationlw(req);
                }
                return dc.updaterotationunchecked(forceupdate);
            }
            return false;
        } finally {
            binder.restorecallingidentity(ident);
        }
    }

displaycontent 显示 mrotation 默认改为 3 (270)

frameworks\base\services\core\java\com\android\server\wm\displaycontent.java

/**
     * current rotation of the display.
     * constants as per {@link android.view.surface.rotation}.
     *
     * @see #updaterotationunchecked()
     */
    // private int mrotation = 0;
    private int mrotation = 3;//cczheng add for land scap

修改默认值 config_reversedefaultrotation 为 true，翻转显示角度

frameworks\base\core\res\res\values\config.xml

<!-- if true, the direction rotation is applied to get to an application's requested
         orientation is reversed.  normally, the model is that landscape is
         clockwise from portrait; thus on a portrait device an app requesting
         landscape will cause a clockwise rotation, and on a landscape device an
         app requesting portrait will cause a counter-clockwise rotation.  setting
         true here reverses that logic. -->
    <!-- cczheng add for land scap -->
    <bool name="config_reversedefaultrotation">true</bool> 

    <!-- the number of degrees to rotate the display when the keyboard is open.
         a value of -1 means no change in orientation by default. -->
    <!-- cczheng add for land scap -->
    <integer name="config_lidopenrotation">270</integer>

2、屏幕触摸坐标修改为横屏

对调 frame 的宽和高,设置方向为 270

frameworks\native\services\surfaceflinger\displaydevice.cpp

void displaydevice::setprojection(int orientation,
        const rect& newviewport, const rect& newframe) {
    rect viewport(newviewport);
    rect frame(newframe);

    const int w = mdisplaywidth;
    const int h = mdisplayheight;

    transform r;
    displaydevice::orientationtotransfrom(orientation, w, h, &r);

    if (!frame.isvalid()) {
        // the destination frame can be invalid if it has never been set,
        // in that case we assume the whole display frame.
        //cczheng add for land scap
        // frame = rect(w, h);
        if (w < h)
            frame = rect(h, w);
        else
            frame = rect(w, h);
    }
    ....

}

// clang-format off
displaydevice::displaydevice(
        const sp<surfaceflinger>& flinger,
        displaytype type,
        int32_t hwcid,
        bool issecure,
        const wp<ibinder>& displaytoken,
        const sp<anativewindow>& nativewindow,
        const sp<displaysurface>& displaysurface,
        std::unique_ptr<re::surface> rendersurface,
        int displaywidth,
        int displayheight,
        bool haswidecolorgamut,
        const hdrcapabilities& hdrcapabilities,
        const int32_t supportedperframemetadata,
        const std::unordered_map<colormode, std::vector<renderintent>>& hwccolormodes,
        int initialpowermode)

      .....

    mhdrcapabilities = hdrcapabilities(types, maxluminance, maxaverageluminance, minluminance);

    // initialize the display orientation transform.
    // setprojection(displaystate::eorientationdefault, mviewport, mframe);
    //cczheng add for land scap
    setprojection(displaystate::eorientation270, mviewport, mframe);
#ifdef mtk_sf_debug_support
    mfps = fpscounterloader::getinstance().create();
#endif
}

frameworks\native\services\surfaceflinger\surfaceflinger.cpp

void surfaceflinger::oninitializedisplays() {
    // reset screen orientation and use primary layer stack
    vector<composerstate> state;
    vector<displaystate> displays;
    displaystate d;
    d.what = displaystate::edisplayprojectionchanged |
             displaystate::elayerstackchanged;
    d.token = mbuiltindisplays[displaydevice::display_primary];
    d.layerstack = 0;
    //d.orientation = displaystate::eorientationdefault;
    //cczheng add for land scap
    d.orientation = displaystate::eorientation270;
    d.frame.makeinvalid();
    d.viewport.makeinvalid();
    d.width = 0;
    d.height = 0;
    displays.add(d);

    ....
}

3、开机动画横屏

对调 createsurface() 的 w 和 h

frameworks\base\cmds\bootanimation\bootanimation.cpp

status_t bootanimation::readytorun() {
    massets.adddefaultassets();

    sp<ibinder> dtoken(surfacecomposerclient::getbuiltindisplay(
            isurfacecomposer::edisplayidmain));
    displayinfo dinfo;
    status_t status = surfacecomposerclient::getdisplayinfo(dtoken, &dinfo);
    if (status)
        return -1;

    // create the native surface
    /*sp<surfacecontrol> control = session()->createsurface(string8("bootanimation"),
            dinfo.w, dinfo.h, pixel_format_rgb_565);*/

    //cczheng add for land scap  [s]
    sp<surfacecontrol> control;
    if(dinfo.w < dinfo.h)
        control = session()->createsurface(string8("bootanimation"),
            dinfo.h, dinfo.w, pixel_format_rgb_565);
    else
        control = session()->createsurface(string8("bootanimation"),
            dinfo.w, dinfo.h, pixel_format_rgb_565);
    //cczheng add for land scap  [e]

    surfacecomposerclient::transaction t;
    t.setlayer(control, 0x40000000)
        .apply();

    .....

}

开机动画制作替换后面补充。。。

4、开机logo、关机充电动画横屏

开机logo定义屏幕分辨率以对应资源文件夹的位置为

vendor\mediatek\proprietary\bootable\bootloader\lk\project\xxxx.mk 没有则看下面的

device\mediateksample\xxxx\projectconfig.mk

mk 中的 boot_logo = wxga

对应的资源文件位置在 vendor/mediatek/proprietary/bootable/bootloader/lk/dev/logo/wxga

可以看到 wxga 中都是竖屏的图片，而 wxganl 中已经是横屏的图片

则我们将 boot_logo 修改为 wxganl 即可

接下来还需要继续修改显示的角度，依旧改成 270，不然会出现花屏的现象

开机第一张图片 uboot 对应显示

vendor\mediatek\proprietary\bootable\bootloader\lk\platform\mt6765\mt_logo.c

void init_fb_screen()
{
    .....

    // in jb2.mp need to allign width and height to 32 ,but jb5.mp needn't
    phical_screen.needallign = 1;
    phical_screen.allignwidth = align_to(cfg_display_width, mtk_fb_alignment);

    /* in gb, no need to adjust 180 showing logo ,for fb driver dealing the change */
    /* but in jb, need adjust it for screen 180 roration           */
    phical_screen.need180adjust = 0;   // need sync with chip driver

    dprintf(info, "[lk logo: %s %d]mtk_lcm_physical_rotation = %s\n",__function__,__line__, mtk_lcm_physical_rotation);

    if (0 == strncmp(mtk_lcm_physical_rotation, "270", 3)) {
        phical_screen.rotation = 270;
    } else if (0 == strncmp(mtk_lcm_physical_rotation, "90", 2)) {
        phical_screen.rotation = 90;
    } else if (0 == strncmp(mtk_lcm_physical_rotation, "180", 3) && (phical_screen.need180adjust == 1)) {
        phical_screen.rotation = 180;
    } else {
        phical_screen.rotation = 270;//cczheng add for land scap
    }

    ....

开机第二张图片 kernel 对应显示

vendor\mediatek\proprietary\external\libshowlogo\charging_animation.cpp

int anim_fb_init(void)
{
     .....

    phical_screen.needallign = 1;
    phical_screen.need180adjust = 1;
    phical_screen.fb_size = fb_size;
    if (mtk_log_enable == 1) {
        slogd("[libshowlogo: %s %d]mtk_lcm_physical_rotation = %s\n",__function__,__line__, mtk_lcm_physical_rotation);
    }

    if(0 == strncmp(mtk_lcm_physical_rotation, "270", 3))
    {
        phical_screen.rotation = 270;
    } else if(0 == strncmp(mtk_lcm_physical_rotation, "90", 2)){
        phical_screen.rotation = 90;
    } else if(0 == strncmp(mtk_lcm_physical_rotation, "180", 3) && (phical_screen.need180adjust == 1)){
        phical_screen.rotation = 180;
    } else {
        phical_screen.rotation = 270;//cczheng add for land scap
    }
    if (mtk_log_enable == 1) {
        slogd("[libshowlogo]phical_screen: width= %d,height= %d,bits_per_pixel =%d,needallign = %d,allignwidth=%d rotation =%d ,need180adjust = %d\n",
                phical_screen.width, phical_screen.height,
                phical_screen.bits_per_pixel, phical_screen.needallign,
                phical_screen.allignwidth, phical_screen.rotation, phical_screen.need180adjust);
        slogd("[libshowlogo: %s %d]show old animtion= 1, running show_animationm_ver %d\n",__function__,__line__, show_animationm_ver);
        slogd("[libshowlogo: %s %d]draw_anim_mode = 1, running mode %d\n",__function__,__line__, draw_anim_mode);
    }

    return 0;
}

如果出现充电动画图片错位的现象，多数都是因为图形绘制点和屏幕尺寸不匹配导致的。可通过调整 cust_display.h 中位置参数

android m 后：/vendor/mediatek/proprietary/external/libshowlogo/cust_display.h

android m 前： /vendor/mediatek/proprietary/bootable/bootloader/lk/target/${project}/include/target/cust_display.h

(1 ，使用old version动画方案的调整如下设置，

#define bar_left (215)
#define bar_top (156)
#define bar_right (265)
#define bar_bottom (278)
可以用windows的画图软件打开第1点里提到的图片，根据电池边框的像素来调整。

这里坐标的参考原点是左上角，背景图片的左上角是(0,0)，这四个值都是相对于左上角的坐标来确定的，因此right > left，bottom > top
小技巧：1)打开画图软件，选择 查看->缩放->自定义，将图片放到到800%
2)选择 查看->缩放->显示网格
这样就可以看到一个一个的像素
(2，使用new version动画方案调整如下设置：

#define capacity_left (278) 
#define capacity_top (556)
#define capacity_right (441)
#define capacity_bottom (817)

5、recoveryui 横屏

参考之前写的文章 mtk recovery 模式横屏修改(适用于6.0 + 8.1+9.0)

6、系统导航栏位置调整，横屏后 navigationbarposition 默认在左边

作为平板项目，需要将位置改为底部,直接修改 navigationbarposition() 返回 nav_bar_bottom

frameworks\base\services\core\java\com\android\server\policy\phonewindowmanager.java

@navigationbarposition
    private int navigationbarposition(int displaywidth, int displayheight, int displayrotation) {
        //cchzneg annotaion for land scape
        /*if (mnavigationbarcanmove && displaywidth > displayheight) {
            if (displayrotation == surface.rotation_270) {
                return nav_bar_left;
            } else {
                return nav_bar_right;
            }
        }*/
        return nav_bar_bottom;
    }

这样位置是变为底部了，但是三个按钮都重叠在一起了，需要修改 systemui 的布局显示

vendor\mediatek\proprietary\packages\apps\systemui\src\com\android\systemui\statusbar\phone\navigationbarview.java

private void updaterotatedviews() {
        //cczheng change rot0 rot90 for landscape
        mrotatedviews[surface.rotation_0] =
                mrotatedviews[surface.rotation_180] = findviewbyid(r.id.rot90);
                // mrotatedviews[surface.rotation_180] = findviewbyid(r.id.rot0);
        mrotatedviews[surface.rotation_270] =
                mrotatedviews[surface.rotation_90] = findviewbyid(r.id.rot0);
                // mrotatedviews[surface.rotation_90] = findviewbyid(r.id.rot90);        

        updatecurrentview();
    }

顺带再调整下 navigationbarview 的默认高度和左边 back 键区域太大的问题

vendor\mediatek\proprietary\packages\apps\systemui\src\com\android\systemui\statusbar\phone\navigationbarinflaterview.java

private view createview(string buttonspec, viewgroup parent, layoutinflater inflater) {
        view v = null;
        string button = extractbutton(buttonspec);
        if (left.equals(button)) {
             //cchzheng change navspace to menu_ime for small left back click area
            string s = dependency.get(tunerservice.class).getvalue(nav_bar_left, menu_ime_rotate/*navspace*/);
            button = extractbutton(s);
        } else if (right.equals(button)) {
            string s = dependency.get(tunerservice.class).getvalue(nav_bar_right, menu_ime_rotate);
            button = extractbutton(s);
        }

        ...

frameworks\base\core\res\res\values\dimens.xml

 <!-- height of the bottom navigation / system bar. -->
    <!--cczheng change 48dp to 30dp-->
    <dimen name="navigation_bar_height">30dp</dimen>

ok，这样就大功告成了，完美的横屏适配

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