/*
* Copyright (C) 2008 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.launcher2;
import java.util.Random;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BlurMaskFilter;
import android.graphics.Canvas;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;
import android.graphics.PaintFlagsDrawFilter;
import android.graphics.PorterDuff;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.PaintDrawable;
import android.util.DisplayMetrics;
import com.android.launcher.R;
/**
* Various utilities shared amongst the Launcher's classes.
*/
final class Utilities {
@SuppressWarnings("unused")
private static final String TAG = "Launcher.Utilities";
private static int sIconWidth = -1;
private static int sIconHeight = -1;
private static int sIconTextureWidth = -1;
private static int sIconTextureHeight = -1;
private static final Paint sBlurPaint = new Paint();
private static final Paint sGlowColorPressedPaint = new Paint();
private static final Paint sGlowColorFocusedPaint = new Paint();
private static final Paint sDisabledPaint = new Paint();
private static final Rect sOldBounds = new Rect();
private static final Canvas sCanvas = new Canvas();
static {
sCanvas.setDrawFilter(new PaintFlagsDrawFilter(Paint.DITHER_FLAG,
Paint.FILTER_BITMAP_FLAG));
}
static int sColors[] = { 0xffff0000, 0xff00ff00, 0xff0000ff };
static int sColorIndex = 0;
/**
* 为“所有程序”界面返回适配大小的图标,用于将4.0以前时保存的icon(74x74
* px)转换为dp,48dp为普通屏幕,更大的屏幕有可能是64dp甚至72dp
*/
static Bitmap createIconBitmap(Bitmap icon, Context context) {
int textureWidth = sIconTextureWidth;
int textureHeight = sIconTextureHeight;
int sourceWidth = icon.getWidth();
int sourceHeight = icon.getHeight();
if (sourceWidth > textureWidth && sourceHeight > textureHeight) {
// 如果太大就缩小
return Bitmap.createBitmap(icon, (sourceWidth - textureWidth) / 2,
(sourceHeight - textureHeight) / 2, textureWidth,
textureHeight);
} else if (sourceWidth == textureWidth && sourceHeight == textureHeight) {
// 如果原本尺寸就正确,啥也不做
return icon;
} else {
// 如果太小就放大
final Resources resources = context.getResources();
return createIconBitmap(new BitmapDrawable(resources, icon),
context);
}
}
/**
* 为“所有程序”界面返回适配的icon
*/
static Bitmap createIconBitmap(Drawable icon, Context context) {
synchronized (sCanvas) { // we share the statics :-(
if (sIconWidth == -1) {
initStatics(context);
}
int width = sIconWidth;
int height = sIconHeight;
if (icon instanceof PaintDrawable) {
PaintDrawable painter = (PaintDrawable) icon;
painter.setIntrinsicWidth(width);
painter.setIntrinsicHeight(height);
} else if (icon instanceof BitmapDrawable) {
// Ensure the bitmap has a density.
BitmapDrawable bitmapDrawable = (BitmapDrawable) icon;
Bitmap bitmap = bitmapDrawable.getBitmap();
if (bitmap.getDensity() == Bitmap.DENSITY_NONE) {
bitmapDrawable.setTargetDensity(context.getResources()
.getDisplayMetrics());
}
}
int sourceWidth = icon.getIntrinsicWidth();
int sourceHeight = icon.getIntrinsicHeight();
if (sourceWidth > 0 && sourceHeight > 0) {
// There are intrinsic sizes.
if (width < sourceWidth || height < sourceHeight) {
// It's too big, scale it down.
final float ratio = (float) sourceWidth / sourceHeight;
if (sourceWidth > sourceHeight) {
height = (int) (width / ratio);
} else if (sourceHeight > sourceWidth) {
width = (int) (height * ratio);
}
} else if (sourceWidth < width && sourceHeight < height) {
// Don't scale up the icon
width = sourceWidth;
height = sourceHeight;
}
}
// no intrinsic size --> use default size
int textureWidth = sIconTextureWidth;
int textureHeight = sIconTextureHeight;
final Bitmap bitmap = Bitmap.createBitmap(textureWidth,
textureHeight, Bitmap.Config.ARGB_8888);
final Canvas canvas = sCanvas;
canvas.setBitmap(bitmap);
final int left = (textureWidth - width) / 2;
final int top = (textureHeight - height) / 2;
@SuppressWarnings("all")
// suppress dead code warning
final boolean debug = false;
if (debug) {
// draw a big box for the icon for debugging
canvas.drawColor(sColors[sColorIndex]);
if (++sColorIndex >= sColors.length)
sColorIndex = 0;
Paint debugPaint = new Paint();
debugPaint.setColor(0xffcccc00);
canvas.drawRect(left, top, left + width, top + height,
debugPaint);
}
sOldBounds.set(icon.getBounds());
icon.setBounds(left, top, left + width, top + height);
icon.draw(canvas);
icon.setBounds(sOldBounds);
canvas.setBitmap(null);
return bitmap;
}
}
static void drawSelectedAllAppsBitmap(Canvas dest, int destWidth,
int destHeight, boolean pressed, Bitmap src) {
synchronized (sCanvas) { // we share the statics :-(
if (sIconWidth == -1) {
// 运行到此处还没有初始化那说明错了……
throw new RuntimeException(
"Assertion failed: Utilities not initialized");
}
dest.drawColor(0, PorterDuff.Mode.CLEAR);
int[] xy = new int[2];
Bitmap mask = src.extractAlpha(sBlurPaint, xy);
float px = (destWidth - src.getWidth()) / 2;
float py = (destHeight - src.getHeight()) / 2;
dest.drawBitmap(mask, px + xy[0], py + xy[1],
pressed ? sGlowColorPressedPaint : sGlowColorFocusedPaint);
mask.recycle();
}
}
/**
* Returns a Bitmap representing the thumbnail of the specified Bitmap. The
* size of the thumbnail is defined by the dimension
* android.R.dimen.launcher_application_icon_size.
*
* @param bitmap
* The bitmap to get a thumbnail of.
* @param context
* The application's context.
*
* @return A thumbnail for the specified bitmap or the bitmap itself if the
* thumbnail could not be created.
*/
static Bitmap resampleIconBitmap(Bitmap bitmap, Context context) {
synchronized (sCanvas) { // we share the statics :-(
if (sIconWidth == -1) {
initStatics(context);
}
if (bitmap.getWidth() == sIconWidth
&& bitmap.getHeight() == sIconHeight) {
return bitmap;
} else {
final Resources resources = context.getResources();
return createIconBitmap(new BitmapDrawable(resources, bitmap),
context);
}
}
}
static Bitmap drawDisabledBitmap(Bitmap bitmap, Context context) {
synchronized (sCanvas) { // we share the statics :-(
if (sIconWidth == -1) {
initStatics(context);
}
final Bitmap disabled = Bitmap.createBitmap(bitmap.getWidth(),
bitmap.getHeight(), Bitmap.Config.ARGB_8888);
final Canvas canvas = sCanvas;
canvas.setBitmap(disabled);
canvas.drawBitmap(bitmap, 0.0f, 0.0f, sDisabledPaint);
canvas.setBitmap(null);
return disabled;
}
}
private static void initStatics(Context context) {
final Resources resources = context.getResources();
final DisplayMetrics metrics = resources.getDisplayMetrics();
final float density = metrics.density;
sIconWidth = sIconHeight = (int) resources
.getDimension(R.dimen.app_icon_size);
sIconTextureWidth = sIconTextureHeight = sIconWidth;
sBlurPaint.setMaskFilter(new BlurMaskFilter(5 * density,
BlurMaskFilter.Blur.NORMAL));
sGlowColorPressedPaint.setColor(0xffffc300);
sGlowColorFocusedPaint.setColor(0xffff8e00);
ColorMatrix cm = new ColorMatrix();
cm.setSaturation(0.2f);
sDisabledPaint.setColorFilter(new ColorMatrixColorFilter(cm));
sDisabledPaint.setAlpha(0x88);
}
/** Only works for positive numbers. */
static int roundToPow2(int n) {
int orig = n;
n >>= 1;
int mask = 0x8000000;
while (mask != 0 && (n & mask) == 0) {
mask >>= 1;
}
while (mask != 0) {
n |= mask;
mask >>= 1;
}
n += 1;
if (n != orig) {
n <<= 1;
}
return n;
}
static int generateRandomId() {
return new Random(System.currentTimeMillis()).nextInt(1 << 24);
}
}