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/*
* Copyright (C) 2011 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.layoutlib.bridge.impl;
import com.android.ide.common.rendering.api.DrawableParams;
import com.android.ide.common.rendering.api.HardwareConfig;
import com.android.ide.common.rendering.api.ResourceValue;
import com.android.ide.common.rendering.api.Result;
import com.android.ide.common.rendering.api.Result.Status;
import com.android.layoutlib.bridge.android.BridgeContext;
import com.android.layoutlib.bridge.android.RenderParamsFlags;
import com.android.resources.ResourceType;
import android.annotation.NonNull;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.StateListDrawable;
import android.view.AttachInfo_Accessor;
import android.view.View.MeasureSpec;
import android.widget.FrameLayout;
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Action to render a given {@link Drawable} provided through {@link DrawableParams#getDrawable()}.
*
* The class only provides a simple {@link #render()} method, but the full life-cycle of the
* action must be respected.
*
* @see RenderAction
*/
public class RenderDrawable extends RenderAction<DrawableParams> {
public RenderDrawable(@NonNull DrawableParams params) {
super(new DrawableParams(params));
}
@NonNull
public Result render() {
checkLock();
// Get the drawable resource value.
DrawableParams params = getParams();
HardwareConfig hardwareConfig = params.getHardwareConfig();
ResourceValue drawableResource = params.getDrawable();
// Resolve it.
BridgeContext context = getContext();
drawableResource = context.getRenderResources().resolveResValue(drawableResource);
if (drawableResource == null) {
return Status.ERROR_NOT_A_DRAWABLE.createResult();
}
ResourceType resourceType = drawableResource.getResourceType();
if (resourceType != ResourceType.DRAWABLE && resourceType != ResourceType.MIPMAP) {
return Status.ERROR_NOT_A_DRAWABLE.createResult();
}
Drawable d = ResourceHelper.getDrawable(drawableResource, context);
if (d == null) {
return Status.ERROR_NOT_A_DRAWABLE.createResult();
}
Boolean allStates = params.getFlag(RenderParamsFlags.FLAG_KEY_RENDER_ALL_DRAWABLE_STATES);
if (allStates == Boolean.TRUE) {
List<BufferedImage> result;
if (d instanceof StateListDrawable) {
result = new ArrayList<BufferedImage>();
StateListDrawable stateList = (StateListDrawable) d;
for (int i = 0; i < stateList.getStateCount(); i++) {
Drawable stateDrawable = stateList.getStateDrawable(i);
result.add(renderImage(hardwareConfig, stateDrawable, context));
}
} else {
result = Collections.singletonList(renderImage(hardwareConfig, d, context));
}
return Status.SUCCESS.createResult(result);
} else {
BufferedImage image = renderImage(hardwareConfig, d, context);
return Status.SUCCESS.createResult(image);
}
}
@NonNull
private BufferedImage renderImage(@NonNull HardwareConfig hardwareConfig, @NonNull Drawable d,
@NonNull BridgeContext context) {
// Create a simple FrameLayout.
FrameLayout content = new FrameLayout(context);
// Get the actual Drawable object to draw.
content.setBackground(d);
// Set the AttachInfo on the root view.
AttachInfo_Accessor.setAttachInfo(content);
// Measure.
int w = d.getIntrinsicWidth();
int h = d.getIntrinsicHeight();
int screenWidth = hardwareConfig.getScreenWidth();
int screenHeight = hardwareConfig.getScreenHeight();
if (w == -1 || h == -1) {
// Use screen size when either intrinsic width or height isn't available.
w = screenWidth;
h = screenHeight;
} else if (w > screenWidth || h > screenHeight) {
// If image wouldn't fit to the screen, resize it to avoid cropping.
// We need to find scale such that scale * w <= screenWidth, scale * h <= screenHeight.
double scale = Math.min((double) screenWidth / w, (double) screenHeight / h);
// scale * w / scale * h = w / h, so, proportions are preserved.
w = (int) Math.floor(scale * w);
h = (int) Math.floor(scale * h);
}
int w_spec = MeasureSpec.makeMeasureSpec(w, MeasureSpec.EXACTLY);
int h_spec = MeasureSpec.makeMeasureSpec(h, MeasureSpec.EXACTLY);
content.measure(w_spec, h_spec);
// Now do the layout.
content.layout(0, 0, w, h);
// Pre-draw setup.
AttachInfo_Accessor.dispatchOnPreDraw(content);
// Draw into a new image.
BufferedImage image = getImage(w, h);
// Create an Android bitmap around the BufferedImage.
Bitmap bitmap = Bitmap.createBitmap(image.getWidth(), image.getHeight(),
Config.ARGB_8888);
bitmap.setPixels(image.getRGB(0, 0, image.getWidth(), image.getHeight(),
null, 0, image.getWidth()), 0, image.getWidth(), 0, 0, image
.getWidth(), image.getHeight());
// Create a Canvas around the Android bitmap.
Canvas canvas = new Canvas(bitmap);
canvas.setDensity(hardwareConfig.getDensity().getDpiValue());
// Draw.
content.draw(canvas);
int[] pixels = new int[image.getWidth() * image.getHeight()];
bitmap.getPixels(pixels, 0, image.getWidth(), 0, 0, image.getWidth(),
image.getHeight());
image.setRGB(0, 0, image.getWidth(), image.getHeight(), pixels, 0, image.getWidth());
// Detach root from window after draw.
AttachInfo_Accessor.detachFromWindow(content);
return image;
}
@NonNull
protected BufferedImage getImage(int w, int h) {
BufferedImage image = new BufferedImage(w > 0 ? w : 1,
h > 0 ? h : 1,
BufferedImage.TYPE_INT_ARGB);
Graphics2D gc = image.createGraphics();
gc.setComposite(AlphaComposite.Src);
gc.setColor(new Color(0x00000000, true));
gc.fillRect(0, 0, w, h);
// done
gc.dispose();
return image;
}
}
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