/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.systemui;
import android.app.ActivityManager;
import android.app.WallpaperManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.Region.Op;
import android.opengl.GLUtils;
import android.os.SystemProperties;
import android.renderscript.Matrix4f;
import android.service.wallpaper.WallpaperService;
import android.util.Log;
import android.view.Display;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.WindowManager;
import javax.microedition.khronos.egl.EGL10;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.egl.EGLContext;
import javax.microedition.khronos.egl.EGLDisplay;
import javax.microedition.khronos.egl.EGLSurface;
import javax.microedition.khronos.opengles.GL;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import static android.opengl.GLES20.*;
import static javax.microedition.khronos.egl.EGL10.*;
/**
* Default built-in wallpaper that simply shows a static image.
*/
@SuppressWarnings({"UnusedDeclaration"})
public class ImageWallpaper extends WallpaperService {
private static final String TAG = "ImageWallpaper";
private static final String GL_LOG_TAG = "ImageWallpaperGL";
private static final boolean DEBUG = false;
private static final String PROPERTY_KERNEL_QEMU = "ro.kernel.qemu";
static final boolean FIXED_SIZED_SURFACE = true;
static final boolean USE_OPENGL = true;
WallpaperManager mWallpaperManager;
boolean mIsHwAccelerated;
@Override
public void onCreate() {
super.onCreate();
mWallpaperManager = (WallpaperManager) getSystemService(WALLPAPER_SERVICE);
//noinspection PointlessBooleanExpression,ConstantConditions
if (FIXED_SIZED_SURFACE && USE_OPENGL) {
if (!isEmulator()) {
WindowManager windowManager =
(WindowManager) getSystemService(Context.WINDOW_SERVICE);
Display display = windowManager.getDefaultDisplay();
mIsHwAccelerated = ActivityManager.isHighEndGfx(display);
}
}
}
private static boolean isEmulator() {
return "1".equals(SystemProperties.get(PROPERTY_KERNEL_QEMU, "0"));
}
public Engine onCreateEngine() {
return new DrawableEngine();
}
class DrawableEngine extends Engine {
static final int EGL_CONTEXT_CLIENT_VERSION = 0x3098;
static final int EGL_OPENGL_ES2_BIT = 4;
private final Object mLock = new Object[0];
// TODO: Not currently used, keeping around until we know we don't need it
@SuppressWarnings({"UnusedDeclaration"})
private WallpaperObserver mReceiver;
Bitmap mBackground;
int mBackgroundWidth = -1, mBackgroundHeight = -1;
float mXOffset;
float mYOffset;
boolean mVisible = true;
boolean mRedrawNeeded;
boolean mOffsetsChanged;
int mLastXTranslation;
int mLastYTranslation;
private EGL10 mEgl;
private EGLDisplay mEglDisplay;
private EGLConfig mEglConfig;
private EGLContext mEglContext;
private EGLSurface mEglSurface;
private GL mGL;
private static final String sSimpleVS =
"attribute vec4 position;\n" +
"attribute vec2 texCoords;\n" +
"varying vec2 outTexCoords;\n" +
"uniform mat4 projection;\n" +
"\nvoid main(void) {\n" +
" outTexCoords = texCoords;\n" +
" gl_Position = projection * position;\n" +
"}\n\n";
private static final String sSimpleFS =
"precision mediump float;\n\n" +
"varying vec2 outTexCoords;\n" +
"uniform sampler2D texture;\n" +
"\nvoid main(void) {\n" +
" gl_FragColor = texture2D(texture, outTexCoords);\n" +
"}\n\n";
private static final int FLOAT_SIZE_BYTES = 4;
private static final int TRIANGLE_VERTICES_DATA_STRIDE_BYTES = 5 * FLOAT_SIZE_BYTES;
private static final int TRIANGLE_VERTICES_DATA_POS_OFFSET = 0;
private static final int TRIANGLE_VERTICES_DATA_UV_OFFSET = 3;
class WallpaperObserver extends BroadcastReceiver {
public void onReceive(Context context, Intent intent) {
if (DEBUG) {
Log.d(TAG, "onReceive");
}
synchronized (mLock) {
mBackgroundWidth = mBackgroundHeight = -1;
mBackground = null;
mRedrawNeeded = true;
drawFrameLocked();
}
}
}
@Override
public void onCreate(SurfaceHolder surfaceHolder) {
if (DEBUG) {
Log.d(TAG, "onCreate");
}
super.onCreate(surfaceHolder);
// TODO: Don't need this currently because the wallpaper service
// will restart the image wallpaper whenever the image changes.
//IntentFilter filter = new IntentFilter(Intent.ACTION_WALLPAPER_CHANGED);
//mReceiver = new WallpaperObserver();
//registerReceiver(mReceiver, filter, null, mHandler);
updateSurfaceSize(surfaceHolder);
setOffsetNotificationsEnabled(false);
}
@Override
public void onDestroy() {
super.onDestroy();
if (mReceiver != null) {
unregisterReceiver(mReceiver);
}
}
@Override
public void onDesiredSizeChanged(int desiredWidth, int desiredHeight) {
super.onDesiredSizeChanged(desiredWidth, desiredHeight);
SurfaceHolder surfaceHolder = getSurfaceHolder();
if (surfaceHolder != null) {
updateSurfaceSize(surfaceHolder);
}
}
void updateSurfaceSize(SurfaceHolder surfaceHolder) {
if (FIXED_SIZED_SURFACE) {
// Used a fixed size surface, because we are special. We can do
// this because we know the current design of window animations doesn't
// cause this to break.
surfaceHolder.setFixedSize(getDesiredMinimumWidth(), getDesiredMinimumHeight());
} else {
surfaceHolder.setSizeFromLayout();
}
}
@Override
public void onVisibilityChanged(boolean visible) {
if (DEBUG) {
Log.d(TAG, "onVisibilityChanged: visible=" + visible);
}
synchronized (mLock) {
if (mVisible != visible) {
if (DEBUG) {
Log.d(TAG, "Visibility changed to visible=" + visible);
}
mVisible = visible;
drawFrameLocked();
}
}
}
@Override
public void onTouchEvent(MotionEvent event) {
super.onTouchEvent(event);
}
@Override
public void onOffsetsChanged(float xOffset, float yOffset,
float xOffsetStep, float yOffsetStep,
int xPixels, int yPixels) {
if (DEBUG) {
Log.d(TAG, "onOffsetsChanged: xOffset=" + xOffset + ", yOffset=" + yOffset
+ ", xOffsetStep=" + xOffsetStep + ", yOffsetStep=" + yOffsetStep
+ ", xPixels=" + xPixels + ", yPixels=" + yPixels);
}
synchronized (mLock) {
if (mXOffset != xOffset || mYOffset != yOffset) {
if (DEBUG) {
Log.d(TAG, "Offsets changed to (" + xOffset + "," + yOffset + ").");
}
mXOffset = xOffset;
mYOffset = yOffset;
mOffsetsChanged = true;
}
drawFrameLocked();
}
}
@Override
public void onSurfaceChanged(SurfaceHolder holder, int format, int width, int height) {
if (DEBUG) {
Log.d(TAG, "onSurfaceChanged: width=" + width + ", height=" + height);
}
super.onSurfaceChanged(holder, format, width, height);
synchronized (mLock) {
mRedrawNeeded = true;
drawFrameLocked();
}
}
void drawFrameLocked() {
if (!mVisible) {
if (DEBUG) {
Log.d(TAG, "Suppressed drawFrame since wallpaper is not visible.");
}
return;
}
if (!mRedrawNeeded && !mOffsetsChanged) {
if (DEBUG) {
Log.d(TAG, "Suppressed drawFrame since redraw is not needed "
+ "and offsets have not changed.");
}
return;
}
if (mBackgroundWidth < 0 || mBackgroundHeight < 0) {
// If we don't yet know the size of the wallpaper bitmap,
// we need to get it now.
updateWallpaperLocked();
}
SurfaceHolder sh = getSurfaceHolder();
final Rect frame = sh.getSurfaceFrame();
final int dw = frame.width();
final int dh = frame.height();
final int availw = dw - mBackgroundWidth;
final int availh = dh - mBackgroundHeight;
int xPixels = availw < 0 ? (int)(availw * mXOffset + .5f) : (availw / 2);
int yPixels = availh < 0 ? (int)(availh * mYOffset + .5f) : (availh / 2);
mOffsetsChanged = false;
if (!mRedrawNeeded && xPixels == mLastXTranslation && yPixels == mLastYTranslation) {
if (DEBUG) {
Log.d(TAG, "Suppressed drawFrame since the image has not "
+ "actually moved an integral number of pixels.");
}
return;
}
mRedrawNeeded = false;
mLastXTranslation = xPixels;
mLastYTranslation = yPixels;
if (mBackground == null) {
// If we somehow got to this point after we have last flushed
// the wallpaper, well we really need it to draw again. So
// seems like we need to reload it. Ouch.
updateWallpaperLocked();
}
if (mIsHwAccelerated) {
if (!drawWallpaperWithOpenGL(sh, availw, availh, xPixels, yPixels)) {
drawWallpaperWithCanvas(sh, availw, availh, xPixels, yPixels);
}
} else {
drawWallpaperWithCanvas(sh, availw, availh, xPixels, yPixels);
}
if (FIXED_SIZED_SURFACE) {
// If the surface is fixed-size, we should only need to
// draw it once and then we'll let the window manager
// position it appropriately. As such, we no longer needed
// the loaded bitmap. Yay!
mBackground = null;
mWallpaperManager.forgetLoadedWallpaper();
}
}
void updateWallpaperLocked() {
Throwable exception = null;
try {
mBackground = mWallpaperManager.getBitmap();
} catch (RuntimeException e) {
exception = e;
} catch (OutOfMemoryError e) {
exception = e;
}
if (exception != null) {
mBackground = null;
// Note that if we do fail at this, and the default wallpaper can't
// be loaded, we will go into a cycle. Don't do a build where the
// default wallpaper can't be loaded.
Log.w(TAG, "Unable to load wallpaper!", exception);
try {
mWallpaperManager.clear();
} catch (IOException ex) {
// now we're really screwed.
Log.w(TAG, "Unable reset to default wallpaper!", ex);
}
}
mBackgroundWidth = mBackground != null ? mBackground.getWidth() : 0;
mBackgroundHeight = mBackground != null ? mBackground.getHeight() : 0;
}
private void drawWallpaperWithCanvas(SurfaceHolder sh, int w, int h, int x, int y) {
Canvas c = sh.lockCanvas();
if (c != null) {
try {
if (DEBUG) {
Log.d(TAG, "Redrawing: x=" + x + ", y=" + y);
}
c.translate(x, y);
if (w < 0 || h < 0) {
c.save(Canvas.CLIP_SAVE_FLAG);
c.clipRect(0, 0, mBackgroundWidth, mBackgroundHeight, Op.DIFFERENCE);
c.drawColor(0xff000000);
c.restore();
}
if (mBackground != null) {
c.drawBitmap(mBackground, 0, 0, null);
}
} finally {
sh.unlockCanvasAndPost(c);
}
}
}
private boolean drawWallpaperWithOpenGL(SurfaceHolder sh, int w, int h, int left, int top) {
if (!initGL(sh)) return false;
final float right = left + mBackgroundWidth;
final float bottom = top + mBackgroundHeight;
final Rect frame = sh.getSurfaceFrame();
final Matrix4f ortho = new Matrix4f();
ortho.loadOrtho(0.0f, frame.width(), frame.height(), 0.0f, -1.0f, 1.0f);
final FloatBuffer triangleVertices = createMesh(left, top, right, bottom);
final int texture = loadTexture(mBackground);
final int program = buildProgram(sSimpleVS, sSimpleFS);
final int attribPosition = glGetAttribLocation(program, "position");
final int attribTexCoords = glGetAttribLocation(program, "texCoords");
final int uniformTexture = glGetUniformLocation(program, "texture");
final int uniformProjection = glGetUniformLocation(program, "projection");
checkGlError();
glViewport(0, 0, frame.width(), frame.height());
glBindTexture(GL_TEXTURE_2D, texture);
glUseProgram(program);
glEnableVertexAttribArray(attribPosition);
glEnableVertexAttribArray(attribTexCoords);
glUniform1i(uniformTexture, 0);
glUniformMatrix4fv(uniformProjection, 1, false, ortho.getArray(), 0);
checkGlError();
if (w < 0 || h < 0) {
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClear(GL_COLOR_BUFFER_BIT);
}
// drawQuad
triangleVertices.position(TRIANGLE_VERTICES_DATA_POS_OFFSET);
glVertexAttribPointer(attribPosition, 3, GL_FLOAT, false,
TRIANGLE_VERTICES_DATA_STRIDE_BYTES, triangleVertices);
triangleVertices.position(TRIANGLE_VERTICES_DATA_UV_OFFSET);
glVertexAttribPointer(attribTexCoords, 3, GL_FLOAT, false,
TRIANGLE_VERTICES_DATA_STRIDE_BYTES, triangleVertices);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
if (!mEgl.eglSwapBuffers(mEglDisplay, mEglSurface)) {
throw new RuntimeException("Cannot swap buffers");
}
checkEglError();
finishGL();
return true;
}
private FloatBuffer createMesh(int left, int top, float right, float bottom) {
final float[] verticesData = {
// X, Y, Z, U, V
left, bottom, 0.0f, 0.0f, 1.0f,
right, bottom, 0.0f, 1.0f, 1.0f,
left, top, 0.0f, 0.0f, 0.0f,
right, top, 0.0f, 1.0f, 0.0f,
};
final int bytes = verticesData.length * FLOAT_SIZE_BYTES;
final FloatBuffer triangleVertices = ByteBuffer.allocateDirect(bytes).order(
ByteOrder.nativeOrder()).asFloatBuffer();
triangleVertices.put(verticesData).position(0);
return triangleVertices;
}
private int loadTexture(Bitmap bitmap) {
int[] textures = new int[1];
glActiveTexture(GL_TEXTURE0);
glGenTextures(1, textures, 0);
checkGlError();
int texture = textures[0];
glBindTexture(GL_TEXTURE_2D, texture);
checkGlError();
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
GLUtils.texImage2D(GL_TEXTURE_2D, 0, GL_RGBA, bitmap, GL_UNSIGNED_BYTE, 0);
checkGlError();
bitmap.recycle();
return texture;
}
private int buildProgram(String vertex, String fragment) {
int vertexShader = buildShader(vertex, GL_VERTEX_SHADER);
if (vertexShader == 0) return 0;
int fragmentShader = buildShader(fragment, GL_FRAGMENT_SHADER);
if (fragmentShader == 0) return 0;
int program = glCreateProgram();
glAttachShader(program, vertexShader);
checkGlError();
glAttachShader(program, fragmentShader);
checkGlError();
glLinkProgram(program);
checkGlError();
int[] status = new int[1];
glGetProgramiv(program, GL_LINK_STATUS, status, 0);
if (status[0] != GL_TRUE) {
String error = glGetProgramInfoLog(program);
Log.d(GL_LOG_TAG, "Error while linking program:\n" + error);
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);
glDeleteProgram(program);
return 0;
}
return program;
}
private int buildShader(String source, int type) {
int shader = glCreateShader(type);
glShaderSource(shader, source);
checkGlError();
glCompileShader(shader);
checkGlError();
int[] status = new int[1];
glGetShaderiv(shader, GL_COMPILE_STATUS, status, 0);
if (status[0] != GL_TRUE) {
String error = glGetShaderInfoLog(shader);
Log.d(GL_LOG_TAG, "Error while compiling shader:\n" + error);
glDeleteShader(shader);
return 0;
}
return shader;
}
private void checkEglError() {
int error = mEgl.eglGetError();
if (error != EGL_SUCCESS) {
Log.w(GL_LOG_TAG, "EGL error = " + GLUtils.getEGLErrorString(error));
}
}
private void checkGlError() {
int error = glGetError();
if (error != GL_NO_ERROR) {
Log.w(GL_LOG_TAG, "GL error = 0x" + Integer.toHexString(error), new Throwable());
}
}
private void finishGL() {
mEgl.eglMakeCurrent(mEglDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
mEgl.eglDestroySurface(mEglDisplay, mEglSurface);
mEgl.eglDestroyContext(mEglDisplay, mEglContext);
}
private boolean initGL(SurfaceHolder surfaceHolder) {
mEgl = (EGL10) EGLContext.getEGL();
mEglDisplay = mEgl.eglGetDisplay(EGL_DEFAULT_DISPLAY);
if (mEglDisplay == EGL_NO_DISPLAY) {
throw new RuntimeException("eglGetDisplay failed " +
GLUtils.getEGLErrorString(mEgl.eglGetError()));
}
int[] version = new int[2];
if (!mEgl.eglInitialize(mEglDisplay, version)) {
throw new RuntimeException("eglInitialize failed " +
GLUtils.getEGLErrorString(mEgl.eglGetError()));
}
mEglConfig = chooseEglConfig();
if (mEglConfig == null) {
throw new RuntimeException("eglConfig not initialized");
}
mEglContext = createContext(mEgl, mEglDisplay, mEglConfig);
mEglSurface = mEgl.eglCreateWindowSurface(mEglDisplay, mEglConfig, surfaceHolder, null);
if (mEglSurface == null || mEglSurface == EGL_NO_SURFACE) {
int error = mEgl.eglGetError();
if (error == EGL_BAD_NATIVE_WINDOW) {
Log.e(GL_LOG_TAG, "createWindowSurface returned EGL_BAD_NATIVE_WINDOW.");
return false;
}
throw new RuntimeException("createWindowSurface failed " +
GLUtils.getEGLErrorString(error));
}
if (!mEgl.eglMakeCurrent(mEglDisplay, mEglSurface, mEglSurface, mEglContext)) {
throw new RuntimeException("eglMakeCurrent failed " +
GLUtils.getEGLErrorString(mEgl.eglGetError()));
}
mGL = mEglContext.getGL();
return true;
}
EGLContext createContext(EGL10 egl, EGLDisplay eglDisplay, EGLConfig eglConfig) {
int[] attrib_list = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
return egl.eglCreateContext(eglDisplay, eglConfig, EGL_NO_CONTEXT, attrib_list);
}
private EGLConfig chooseEglConfig() {
int[] configsCount = new int[1];
EGLConfig[] configs = new EGLConfig[1];
int[] configSpec = getConfig();
if (!mEgl.eglChooseConfig(mEglDisplay, configSpec, configs, 1, configsCount)) {
throw new IllegalArgumentException("eglChooseConfig failed " +
GLUtils.getEGLErrorString(mEgl.eglGetError()));
} else if (configsCount[0] > 0) {
return configs[0];
}
return null;
}
private int[] getConfig() {
return new int[] {
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
EGL_RED_SIZE, 8,
EGL_GREEN_SIZE, 8,
EGL_BLUE_SIZE, 8,
EGL_ALPHA_SIZE, 0,
EGL_DEPTH_SIZE, 0,
EGL_STENCIL_SIZE, 0,
EGL_NONE
};
}
}
}