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/*
* 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.launcher3;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
class FastBitmapDrawable extends Drawable {
private static final ColorMatrix sTempSaturationMatrix = new ColorMatrix();
private static final ColorMatrix sTempBrightnessMatrix = new ColorMatrix();
private final Paint mPaint = new Paint(Paint.FILTER_BITMAP_FLAG);
private Bitmap mBitmap;
private int mAlpha;
private float mSatutation = 1;
private int mBrightness = 0;
FastBitmapDrawable(Bitmap b) {
mAlpha = 255;
mBitmap = b;
setBounds(0, 0, b.getWidth(), b.getHeight());
}
@Override
public void draw(Canvas canvas) {
final Rect r = getBounds();
// Draw the bitmap into the bounding rect
canvas.drawBitmap(mBitmap, null, r, mPaint);
}
@Override
public void setColorFilter(ColorFilter cf) {
// No op
}
@Override
public int getOpacity() {
return PixelFormat.TRANSLUCENT;
}
@Override
public void setAlpha(int alpha) {
mAlpha = alpha;
mPaint.setAlpha(alpha);
}
@Override
public void setFilterBitmap(boolean filterBitmap) {
mPaint.setFilterBitmap(filterBitmap);
mPaint.setAntiAlias(filterBitmap);
}
public int getAlpha() {
return mAlpha;
}
@Override
public int getIntrinsicWidth() {
return getBounds().width();
}
@Override
public int getIntrinsicHeight() {
return getBounds().height();
}
@Override
public int getMinimumWidth() {
return getBounds().width();
}
@Override
public int getMinimumHeight() {
return getBounds().height();
}
public Bitmap getBitmap() {
return mBitmap;
}
public float getSaturation() {
return mSatutation;
}
public void setSaturation(float saturation) {
mSatutation = saturation;
updateFilter();
}
public int getBrightness() {
return mBrightness;
}
public void addBrightness(int amount) {
mBrightness += amount;
updateFilter();
}
public void setBrightness(int brightness) {
mBrightness = brightness;
updateFilter();
}
private void updateFilter() {
if (mSatutation != 1 || mBrightness != 0) {
sTempSaturationMatrix.setSaturation(mSatutation);
if (mBrightness != 0) {
// Brightness: C-new = C-old*(1-amount) + amount
float scale = 1 - mBrightness / 255.0f;
sTempBrightnessMatrix.setScale(scale, scale, scale, 1);
float[] array = sTempBrightnessMatrix.getArray();
// Add the amount to RGB components of the matrix, as per the above formula.
// Fifth elements in the array correspond to the constant being added to
// red, blue, green, and alpha channel respectively.
array[4] = mBrightness;
array[9] = mBrightness;
array[14] = mBrightness;
sTempSaturationMatrix.preConcat(sTempBrightnessMatrix);
}
mPaint.setColorFilter(new ColorMatrixColorFilter(sTempSaturationMatrix));
} else {
mPaint.setColorFilter(null);
}
}
}
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