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/*
* Copyright (C) 2014 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.bitmap.drawable;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Rect;
import android.graphics.Shader.TileMode;
import android.graphics.drawable.BitmapDrawable;
import com.android.bitmap.BitmapCache;
/**
* Custom BasicBitmapDrawable implementation for circular images.
*
* This draws all bitmaps as a circle with an optional border stroke.
*/
public class CircularBitmapDrawable extends ExtendedBitmapDrawable {
private static Matrix sMatrix = new Matrix();
private final Paint mBitmapPaint = new Paint();
private final Paint mBorderPaint = new Paint();
private float mBorderWidth;
private Bitmap mShaderBitmap;
public CircularBitmapDrawable(Resources res,
BitmapCache cache, boolean limitDensity) {
this(res, cache, limitDensity, null);
}
public CircularBitmapDrawable(Resources res,
BitmapCache cache, boolean limitDensity, ExtendedOptions opts) {
super(res, cache, limitDensity, opts);
mBitmapPaint.setAntiAlias(true);
mBitmapPaint.setFilterBitmap(true);
mBitmapPaint.setDither(true);
mBorderPaint.setColor(Color.TRANSPARENT);
mBorderPaint.setStyle(Style.STROKE);
mBorderPaint.setStrokeWidth(mBorderWidth);
mBorderPaint.setAntiAlias(true);
}
/**
* Set the border stroke width of this drawable.
*/
public void setBorderWidth(final float borderWidth) {
final boolean changed = mBorderPaint.getStrokeWidth() != borderWidth;
mBorderPaint.setStrokeWidth(borderWidth);
mBorderWidth = borderWidth;
if (changed) {
invalidateSelf();
}
}
/**
* Set the border stroke color of this drawable. Set to {@link Color#TRANSPARENT} to disable.
*/
public void setBorderColor(final int color) {
final boolean changed = mBorderPaint.getColor() != color;
mBorderPaint.setColor(color);
if (changed) {
invalidateSelf();
}
}
@Override
protected void onDrawBitmap(final Canvas canvas, final Rect src,
final Rect dst) {
onDrawCircularBitmap(getBitmap().bmp, canvas, src, dst, 1f);
}
@Override
protected void onDrawPlaceholderOrProgress(final Canvas canvas,
final TileDrawable drawable) {
Rect bounds = getBounds();
if (drawable.getInnerDrawable() instanceof BitmapDrawable) {
BitmapDrawable placeholder =
(BitmapDrawable) drawable.getInnerDrawable();
Bitmap bitmap = placeholder.getBitmap();
float alpha = placeholder.getPaint().getAlpha() / 255f;
sRect.set(0, 0, bitmap.getWidth(), bitmap.getHeight());
onDrawCircularBitmap(bitmap, canvas, sRect, bounds, alpha);
} else {
super.onDrawPlaceholderOrProgress(canvas, drawable);
}
// Then draw the border.
canvas.drawCircle(bounds.centerX(), bounds.centerY(),
bounds.width() / 2f - mBorderWidth / 2, mBorderPaint);
}
/**
* Call this method with a given bitmap to draw it onto the given canvas, masked by a circular
* BitmapShader.
*/
protected void onDrawCircularBitmap(final Bitmap bitmap, final Canvas canvas,
final Rect src, final Rect dst) {
onDrawCircularBitmap(bitmap, canvas, src, dst, 1f);
}
/**
* Call this method with a given bitmap to draw it onto the given canvas, masked by a circular
* BitmapShader. The alpha parameter is the value from 0f to 1f to attenuate the alpha by.
*/
protected void onDrawCircularBitmap(final Bitmap bitmap, final Canvas canvas,
final Rect src, final Rect dst, final float alpha) {
// Draw bitmap through shader first.
BitmapShader shader = (BitmapShader) mBitmapPaint.getShader();
if (shader == null || mShaderBitmap != bitmap) {
shader = new BitmapShader(bitmap, TileMode.CLAMP, TileMode.CLAMP);
mShaderBitmap = bitmap;
}
sMatrix.reset();
// Fit bitmap to bounds.
float scale = Math.max((float) dst.width() / src.width(),
(float) dst.height() / src.height());
sMatrix.postScale(scale, scale);
// Translate bitmap to dst bounds.
sMatrix.postTranslate(dst.left, dst.top);
shader.setLocalMatrix(sMatrix);
mBitmapPaint.setShader(shader);
int oldAlpha = mBitmapPaint.getAlpha();
mBitmapPaint.setAlpha((int) (oldAlpha * alpha));
canvas.drawCircle(dst.centerX(), dst.centerY(), dst.width() / 2,
mBitmapPaint);
mBitmapPaint.setAlpha(oldAlpha);
// Then draw the border.
canvas.drawCircle(dst.centerX(), dst.centerY(),
dst.width() / 2f - mBorderWidth / 2, mBorderPaint);
}
@Override
public void setAlpha(int alpha) {
super.setAlpha(alpha);
final int old = mBitmapPaint.getAlpha();
mBitmapPaint.setAlpha(alpha);
if (alpha != old) {
invalidateSelf();
}
}
@Override
public void setColorFilter(ColorFilter cf) {
super.setColorFilter(cf);
mPaint.setColorFilter(cf);
}
}
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