Android在SurfaceFlinger中修改全局RGB数值（色温调节）

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Android在SurfaceFlinger中修改全局RGB数值（色温调节）

2024-07-11 13:59| 来源: 网络整理| 查看: 265

Android在SurfaceFlinger中修改全局RGB数值前言修改思路java层的修改C++层修改调试指令

前言

需求：通过软件层修改，改变屏幕rgb偏差值完成一个色温调节模式的功能系统版本：android11

修改思路

参考原生colormode切换流程，新加一个SurfaceFlinger的接口；接口中遍历所有layer设置颜色transform矩阵，其中r、g、b的值对应的是三原色的偏转值，0就是不变，正负就是加强或减弱修改完成后通过doTransaction接口刷新画面

mat4 rgbTransformMatrix = mat4( vec4{1.0f + r , 0.0f , 0.0f , 0.0f}, vec4{0.0f , 1.0f + g , 0.0f , 0.0f}, vec4{0.0f , 0.0f , 1.0f + b , 0.0f}, vec4{0.0f , 0.0f , 0.0f , 1.0f} ); java层的修改

frameworks/base/services/core/java/com/android/server/display/color/ColorDisplayService.java settingprovider值

public static final String RGB_RED_ADJUSTMENT = "rgb_red_adjustment"; public static final String RGB_GREEN_ADJUSTMENT = "rgb_green_adjustment"; public static final String RGB_BLUE_ADJUSTMENT = "rgb_blue_adjustment";

在原有的注册监听的地方追加新的监听

private void setUp() { ...... cr.registerContentObserver(Global.getUriFor(RGB_RED_ADJUSTMENT), false /* notifyForDescendants */, mContentObserver, mCurrentUser); cr.registerContentObserver(Global.getUriFor(RGB_GREEN_ADJUSTMENT), false /* notifyForDescendants */, mContentObserver, mCurrentUser); cr.registerContentObserver(Global.getUriFor(RGB_BLUE_ADJUSTMENT), false /* notifyForDescendants */, mContentObserver, mCurrentUser);

处理收到settingprovider变化的通知

private void setUp() { ...... @Override public void onChange(boolean selfChange, Uri uri) { ...... case RGB_RED_ADJUSTMENT: updateRgbMatrix(); break; case RGB_GREEN_ADJUSTMENT: updateRgbMatrix(); break; case RGB_BLUE_ADJUSTMENT: updateRgbMatrix(); break; private void updateRgbMatrix() { Slog.i(TAG, "updateRgbMatrix"); final DisplayTransformManager dtm = getLocalService(DisplayTransformManager.class); final ContentResolver cr = getContext().getContentResolver(); String strR = Settings.Global.getString(cr, RGB_RED_ADJUSTMENT); String strG = Settings.Global.getString(cr, RGB_GREEN_ADJUSTMENT); String strB = Settings.Global.getString(cr, RGB_BLUE_ADJUSTMENT); float r, g, b; if (strR != null) { r = Float.parseFloat(strR); } else { r = 0; } if (strG != null) { g = Float.parseFloat(strG); } else { g = 0; } if (strB != null) { b = Float.parseFloat(strB); } else { b = 0; } dtm.applyRgbMatrix(r, g, b); }

frameworks/base/services/core/java/com/android/server/display/color/DisplayTransformManager.java

private static final int SURFACE_FLINGER_TRANSACTION_RGB_MATRIX = 1037; public void applyRgbMatrix(float r, float g, float b) { Slog.i(TAG, "applyRgbMatrix r: " + r + " g: " + g + " b: " + b); final Parcel data = Parcel.obtain(); data.writeInterfaceToken("android.ui.ISurfaceComposer"); data.writeInt(1); data.writeFloat(r); data.writeFloat(g); data.writeFloat(b); try { sFlinger.transact(SURFACE_FLINGER_TRANSACTION_RGB_MATRIX, data, null, 0); } catch (RemoteException ex) { Slog.e(TAG, "Failed to set rgb transform", ex); } finally { data.recycle(); } } C++层修改

frameworks/base/services/surfaceflinger/SurfaceFlinger.h 新增接口

void updateRgbMatrixLocked(float r, float g, float b);

frameworks/base/services/surfaceflinger/SurfaceFlinger.cpp

status_t SurfaceFlinger::CheckTransactCodeCredentials(uint32_t code) { ...... if (code >= 1000 && code = 1000 && code setColorTransform(rgbTransformMatrix); // const nsecs_t expectedPresentTime = mExpectedPresentTime.load(); // layer->notifyAvailableFrames(expectedPresentTime); layer->doTransaction(0); }); // if (mCurrentState.colorMatrix != colorMatrix) { // mCurrentState.colorMatrix = colorMatrix; // mCurrentState.colorMatrixChanged = true; // setTransactionFlags(eTransactionNeeded); // } // signalLayerUpdate(); // repaintEverything(); } 调试指令

adb shell settings put global rgb_red_adjustment 0.015 adb shell settings put global rgb_green_adjustment 0.015 adb shell settings put global rgb_blue_adjustment 0.015

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Android在SurfaceFlinger中修改全局RGB数值（色温调节）

Android在SurfaceFlinger中修改全局RGB数值（色温调节）

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