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Commit e2d034c9 authored by Mathias Agopian's avatar Mathias Agopian
Browse files

wallpaper: don't erase the background, just to repaint over it. saves 1.7 ms on some hardware

parent cc934763

core/java/com/android/internal/service/wallpaper/ImageWallpaper.java

+12 −7
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ package com.android.internal.service.wallpaper; 
import android.app.WallpaperManager;

import android.graphics.Canvas;

import android.graphics.Rect;

import android.graphics.Region.Op;

import android.graphics.drawable.Drawable;

import android.os.HandlerThread;

import android.os.Process;
@@ -134,14 +135,18 @@ public class ImageWallpaper extends WallpaperService { 
                    final int dh = frame.height();

                    final int bw = mBackground.getIntrinsicWidth();

                    final int bh = mBackground.getIntrinsicHeight();

                    final int availw = bw-dw;

                    final int availh = bh-dh;

                    int xPixels = availw > 0

                            ? -(int)(availw*mXOffset+.5f) : -(availw/2);

                    int yPixels = availh > 0

                            ? -(int)(availh*mYOffset+.5f) : -(availh/2);

                    final int availw = dw-bw;

                    final int availh = dh-bh;

                    int xPixels = availw < 0 ? (int)(availw*mXOffset+.5f) : (availw/2);

                    int yPixels = availh < 0 ? (int)(availh*mYOffset+.5f) : (availh/2);



                    c.translate(xPixels, yPixels);

                    if (availw<0 || availh<0) {

                        c.save(Canvas.CLIP_SAVE_FLAG);

                        c.clipRect(0, 0, bw, bh, Op.DIFFERENCE);

                        c.drawColor(0xff000000);

                        c.restore();

                    }

                    background.draw(c);

                }

                sh.unlockCanvasAndPost(c);