Android/frameworks_base
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Cache wallpaper bitmap to avoid re-loading on rotation

Browse Source 
Screen rotations force static wallpapers to get recreated. One of the things
that happens is that the underlying bitmap resource is loaded. This can be quite
expensive for large bitmaps (which is the case on large-display devices).
A simple optimization is to retain the bitmap in the wallpaper process, to avoid
this re-loading step. We still re-draw and re-upload the texture, but at least
we don't re-load the thing.

Issue #7324823 Manta wallpaper decode performance is atrocious

Change-Id: I0748e275a55992d13704a7dec5910d2dbdc9e2a4
This commit is contained in:
Chet Haase
2012-10-10 15:41:57 -07:00
parent f6138f0720
commit c61d70ec46
1 changed files with 30 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
packages/SystemUI/src/com/android/systemui/ImageWallpaper.java
View File

@@ -19,6 +19,7 @@ package com.android.systemui;
import android.app.ActivityManager;
import android.app.WallpaperManager;
import android.content.BroadcastReceiver;
import android.content.ComponentCallbacks2;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
@@ -62,6 +63,8 @@ public class ImageWallpaper extends WallpaperService {
WallpaperManager mWallpaperManager;
DrawableEngine mEngine;
boolean mIsHwAccelerated;
@Override
@@ -77,12 +80,20 @@ public class ImageWallpaper extends WallpaperService {
}
}
@Override
public void onTrimMemory(int level) {
if (mEngine != null) {
mEngine.trimMemory(level);
}
}
private static boolean isEmulator() {
return "1".equals(SystemProperties.get(PROPERTY_KERNEL_QEMU, "0"));
}
public Engine onCreateEngine() {
return new DrawableEngine();
mEngine = new DrawableEngine();
return mEngine;
}
class DrawableEngine extends Engine {
@@ -155,6 +166,15 @@ public class ImageWallpaper extends WallpaperService {
setFixedSizeAllowed(true);
}
public void trimMemory(int level) {
if (level >= ComponentCallbacks2.TRIM_MEMORY_RUNNING_LOW &&
mBackground != null && mIsHwAccelerated) {
mBackground.recycle();
mBackground = null;
mWallpaperManager.forgetLoadedWallpaper();
}
}
@Override
public void onCreate(SurfaceHolder surfaceHolder) {
if (DEBUG) {
@@ -329,16 +349,17 @@ public class ImageWallpaper extends WallpaperService {
}
} 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!
// hw-accelerated path retains bitmap for faster rotation
mBackground = null;
mWallpaperManager.forgetLoadedWallpaper();
}
}
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() {
@@ -489,8 +510,6 @@ public class ImageWallpaper extends WallpaperService {
GLUtils.texImage2D(GL_TEXTURE_2D, 0, GL_RGBA, bitmap, GL_UNSIGNED_BYTE, 0);
checkGlError();
bitmap.recycle();
return texture;
}