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/*
* Copyright (C) 2010 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 android.graphics;
import com.android.layoutlib.bridge.impl.DelegateManager;
import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
import android.graphics.PorterDuff.Mode;
import java.awt.AlphaComposite;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import static com.android.layoutlib.bridge.impl.PorterDuffUtility.getAlphaCompositeRule;
import static com.android.layoutlib.bridge.impl.PorterDuffUtility.getPorterDuffMode;
/**
* Delegate implementing the native methods of android.graphics.PorterDuffColorFilter
*
* Through the layoutlib_create tool, the original native methods of PorterDuffColorFilter have
* been replaced by calls to methods of the same name in this delegate class.
*
* This class behaves like the original native implementation, but in Java, keeping previously
* native data into its own objects and mapping them to int that are sent back and forth between
* it and the original PorterDuffColorFilter class.
*
* Because this extends {@link ColorFilter_Delegate}, there's no need to use a
* {@link DelegateManager}, as all the Shader classes will be added to the manager
* owned by {@link ColorFilter_Delegate}.
*
* @see ColorFilter_Delegate
*
*/
public class PorterDuffColorFilter_Delegate extends ColorFilter_Delegate {
// ---- delegate data ----
private final int mSrcColor;
private final Mode mMode;
private int mWidth;
private int mHeight;
private BufferedImage mImage;
// ---- Public Helper methods ----
@Override
public boolean isSupported() {
switch (mMode) {
case CLEAR:
case SRC:
case SRC_IN:
case DST_IN:
case SRC_ATOP:
return true;
}
return false;
}
@Override
public String getSupportMessage() {
return "PorterDuff Color Filter is not supported for mode: " + mMode.name() + ".";
}
@Override
public void applyFilter(Graphics2D g, int width, int height) {
createFilterImage(width, height);
g.setComposite(getComposite());
g.drawImage(mImage, 0, 0, null);
}
// ---- native methods ----
@LayoutlibDelegate
/*package*/ static long native_CreatePorterDuffFilter(int srcColor, int porterDuffMode) {
PorterDuffColorFilter_Delegate newDelegate =
new PorterDuffColorFilter_Delegate(srcColor, porterDuffMode);
return sManager.addNewDelegate(newDelegate);
}
// ---- Private delegate/helper methods ----
private PorterDuffColorFilter_Delegate(int srcColor, int mode) {
mSrcColor = srcColor;
mMode = getPorterDuffMode(mode);
}
private void createFilterImage(int width, int height) {
if (mWidth == width && mHeight == height && mImage != null) {
return;
}
mWidth = width;
mHeight = height;
mImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D graphics = mImage.createGraphics();
try {
graphics.setColor(new java.awt.Color(mSrcColor, true /* hasAlpha */));
graphics.fillRect(0, 0, width, height);
} finally {
graphics.dispose();
}
}
private AlphaComposite getComposite() {
return AlphaComposite.getInstance(getAlphaCompositeRule(mMode),
getAlpha() / 255f);
}
private int getAlpha() {
return mSrcColor >>> 24;
}
}
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